View LT3028EFE_4342347.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LT3028 Dual 100mA/500mA Low Dropout, Low Noise, Micropower Regulators with Independent Inputs
FEATURES

DESCRIPTIO
Low Noise: 20VRMS (10Hz to 100kHz) Low Quiescent Current: 30A/Output Independent Inputs Wide Input Voltage Range: 1.8V to 20V Output Current: 100mA/500mA Very Low Shutdown Current: <0.1A Low Dropout Voltage: 300mV/320mV at 100mA/500mA Adjustable Outputs from 1.22V to 20V Stable with as Low as 1F/3.3F Output Capacitor Stable with Aluminum, Tantalum or Ceramic Capacitors Reverse-Battery Protected No Protection Diodes Needed Overcurrent and Overtemperature Protected Tracking/Sequencing Capability Thermally Enhanced 16-Lead TSSOP and 16-Lead (5mm x 3mm) DFN Packages
APPLICATIO S

Cellular Phones Pagers Battery-Powered Systems Frequency Synthesizers Wireless Modems Tracking/Sequencing Power Supplies
The LT (R)3028 is a dual, micropower, low noise, low dropout regulator with independent inputs. With an external 0.01F bypass capacitor, output noise is a low 20VRMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 30A quiescent current per output makes it an ideal choice. In shutdown, quiescent current drops to less than 0.1A. Shutdown control is independent for each output, allowing for flexibility in power management. The device is capable of operating over an input voltage range of 1.8V to 20V. Output 1 can supply 500mA of output current with a dropout voltage of 320mV. The device can supply 100mA of output current from Output 2 with a dropout voltage of 300mV. Quiescent current is well controlled in dropout. The LT3028 regulator is stable with output capacitors as low as 1F for the 100mA output and 3.3F for the 500mA output. Small ceramic capacitors can be used without the series resistance required by other regulators. Internal protection circuitry includes reverse-battery protection, current limiting and thermal limiting protection. The device is available as an adjustable device with a 1.22V reference voltage. The LT3028 regulator is available in the thermally enhanced 16-lead TSSOP and 16-lead, low profile (5mm x 3mm x 0.75mm) DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation. Protected by U.S. Patents including 6118263, 6144250.
TYPICAL APPLICATIO
VIN1 3.7V TO 20V IN1 1F SHDN1 BYP1 ADJ1 LT3028 IN2 1F SHDN2 GND OUT2 OUT1
3.3V/2.5V Low Noise Regulators
0.01F 422k 10F 3.3V AT 500mA 20VRMS NOISE
10Hz to 100kHz Output Noise
249k 2.5V AT 100mA 20VRMS NOISE
VOUT 100V/DIV
VIN2 2.9V TO 20V
0.01F BYP2 ADJ2
261k
10F
249k
3028 TA01a
U
20VRMS
3028 TA01b
U
U
3028f
1
LT3028
ABSOLUTE AXI U RATI GS
IN1, IN2 Pin Voltage .............................................. 20V OUT1, OUT2 Pin Voltage ....................................... 20V Input-to-Output Differential Voltage ....................... 20V ADJ1, ADJ2 Pin Voltage ......................................... 7V BYP1, BYP2 Pin Voltage ....................................... 0.6V SHDN1, SHDN2 Pin Voltage ................................. 20V Output Short-Circut Duration .......................... Indefinite
PACKAGE/ORDER I FOR ATIO
TOP VIEW GND BYP1 OUT1 OUT1 GND OUT2 BYP2 GND 1 2 3 4 5 6 7 8 17 16 GND 15 ADJ1 14 SHDN1 13 IN1 12 IN2 11 SHDN2 10 ADJ2 9 GND
ORDER PART NUMBER LT3028EFE LT3028IFE
FE PART MARKING 3028EFE 3028IFE
FE PACKAGE 16-LEAD PLASTIC TSSOP
TJMAX = 150C, JA = 38C/ W, JC = 8C/ W EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C. (Note 2)
PARAMETER Minimum Input Voltage (Notes 3, 10) ADJ1, ADJ2 Pin Voltage (Notes 3, 4) Line Regulation (Note 3) Load Regulation (Note 3) CONDITIONS Output 2, ILOAD = 100mA Output 1, ILOAD = 500mA VIN = 2V, ILOAD = 1mA Output 2, 2.3V < VIN2 < 20V, 1mA < ILOAD < 100mA Output 1, 2.3V < VIN1 < 20V, 1mA < ILOAD < 500mA VIN = 2V to 20V, ILOAD = 1mA Output 2, VIN2 = 2.3V, ILOAD = 1mA to 100mA VIN2 = 2.3V, ILOAD = 1mA to 100mA Output 1, VIN1 = 2.3V, ILOAD = 1mA to 500mA VIN1 = 2.3V, ILOAD = 1mA to 500mA

2
U
U
W
WW U
W
(Note 1)
Operating Junction Temperature Range (Note 2) ............................................ - 40C to 125C Storage Temperature Range FE Package ....................................... - 65C to 150C DHC Package .................................... - 65C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
TOP VIEW BYP1 NC OUT1 OUT1 GND OUT2 OUT2 BYP2 1 2 3 4 5 6 7 8 17 16 ADJ1 15 SHDN1 14 IN1 13 IN1 12 IN2 11 IN2 10 SHDN2 9 ADJ2
ORDER PART NUMBER LT3028EDHC LT3028IDHC
DHC PART MARKING 3028 3028I
DHC PACKAGE 16-LEAD (5mm x 3mm) PLASTIC DFN
TJMAX = 125C, JA = 40C/ W, JC = 10C/ W EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
MIN
TYP 1.8 1.8
MAX 2.3 2.3 1.235 1.250 1.250 10 12 25 12 25
UNITS V V V V V mV mV mV mV mV
1.205 1.190 1.190
1.220 1.220 1.220 1 1 1
3028f
LT3028
ELECTRICAL CHARACTERISTICS
The denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C. (Note 2)
PARAMETER Dropout Voltage (Output 2) VIN2 = VOUT2(NOMINAL) (Notes 5, 6, 10) CONDITIONS ILOAD = 1mA ILOAD = 1mA ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA ILOAD = 100mA ILOAD = 100mA Dropout Voltage (Output 1) VIN1 = VOUT1(NOMINAL) (Notes 5, 6, 10) ILOAD = 10mA ILOAD = 10mA ILOAD = 50mA ILOAD = 50mA ILOAD = 100mA ILOAD = 100mA ILOAD = 500mA ILOAD = 500mA GND Pin Current (Output 2) VIN2 = VOUT2(NOMINAL) (Notes 5, 7) GND Pin Current (Output 1) VIN1 = VOUT1(NOMINAL) (Notes 5, 7) ILOAD = 0mA ILOAD = 1mA ILOAD = 10mA ILOAD = 50mA ILOAD = 100mA ILOAD = 0mA ILOAD = 1mA ILOAD = 50mA ILOAD = 100mA ILOAD = 250mA ILOAD = 500mA COUT = 10F, CBYP = 0.01F, ILOAD = Full Current, BW = 10Hz to 100kHz ADJ1, ADJ2 (Notes 3, 8) VOUT = Off to On VOUT = On to Off VSHDN1, VSHDN2 = 0V VSHDN1, VSHDN2 = 20V VIN = 6V, VSHDN1 = 0V, VSHDN2 = 0V VIN = 2.72V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = Full Current Output 2, VIN2 = 7V, VOUT2 = 0V VIN2 = 2.3V, VOUT2 = - 0.1V Output 1, VIN1 = 7V, VOUT1 = 0V VIN1 = 2.3V, VOUT1 = - 0.1V Input Reverse Leakage Current VIN = - 20V, VOUT = 0V

MIN
TYP 0.10 0.17
MAX 0.15 0.19 0.22 0.29 0.31 0.40 0.35 0.45 0.19 0.25 0.22 0.32 0.28 0.34 0.37 0.47 50 95 400 2 4 75 120 1.6 3 8 16
UNITS V V V V V V V V V V V V V V V V A A A mA mA A A mA mA mA mA VRMS
0.24
0.30
0.12
0.17
0.21
0.32

25 60 230 1 2.2 30 65 1 2 5 10 20 30 0.25 0.80 0.65 0 1 0.01 55 65 500 110 1.3 520
Output Voltage Noise ADJ1/ADJ2 Pin Bias Current Shutdown Threshold SHDN1/SHDN2 Pin Current (Note 9) Quiescent Current in Shutdown Ripple Rejection Current Limit
100 1.4 0.5 3.0 0.1
nA V V A A A dB mA mA A mA
1
mA
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LT3028 regulator is tested and specified under pulse load conditions such that TJ TA. The LT3028E is guaranteed to meet performance specifications from 0C to 125C junction temperature. Specifications over the - 40C to 125C operating junction temperature
range are assured by design, characterization and correlation with statistical process controls. The LT3028I is guaranteed and tested over the full - 40C to 125C operating junction temperature range. Note 3: The LT3028 is tested and specified for these conditions with the ADJ1/ADJ2 pin connected to the corresponding OUT1/OUT2 pin.
3028f
3
LT3028
ELECTRICAL CHARACTERISTICS
Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current. When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be limited. Note 5: To satisfy requirements for minimum input voltage, the LT3028 is tested and specified for these conditions with an external resistor divider (two 250k resistors) for an output voltage of 2.44V. The external resistor divider will add a 5A DC load on the output. Note 6: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout, the output voltage will be equal to: VIN - VDROPOUT. Note 7: GND pin current is tested with VIN = 2.44V and a current source load. This means the device is tested while operating in its dropout region or at the minimum input voltage specification. This is the worst-case GND pin current. The GND pin current will decrease slightly at higher input voltages. Total GND pin current is equal to the sum of GND pin currents from Output 1 and Output 2. Note 8: ADJ1 and ADJ2 pin bias current flows into the pin. Note 9: SHDN1 and SHDN2 pin current flows into the pin. Note 10: For the LT3028 dropout voltage will be limited by the minimum input voltage specification under some output voltage/load conditions. See the curve of Minimum Input Voltage in the Typical Performance Characteristics.
TYPICAL PERFOR A CE CHARACTERISTICS
Output 2 Typical Dropout Voltage
500 450
DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV)
DROPOUT VOLTAGE (mV)
400 350 300 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA)
3028 G01
TJ = 125C
TJ = 25C
Output 1 Typical Dropout Voltage
500
GUARANTEED DROPOUT VOLTAGE (mV)
450
DROPOUT VOLTAGE (mV)
TJ = 125C
350 300 250 200 150 100 50 0 0 50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA)
3028 G04
350 300 250 200 150 100 50 0 0
TJ 125C TJ 25C
DROPOUT VOLTAGE (mV)
400
TJ = 25C
4
UW
Output 2 Guaranteed Dropout Voltage
500 450 400 350 300 250 200 150 100 50 0 0 10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA)
3028 G02
Output 2 Dropout Voltage
500 450 400 350 300 250 200 150 100 50 0 -50 -25 IL = 50mA IL = 10mA IL = 1mA IL = 100mA
= TEST POINTS
TJ 125C TJ 25C
50 25 0 75 TEMPERATURE (C)
100
125
3028 G03
Output 1 Guaranteed Dropout Voltage
500 450 400
Output 1 Dropout Voltage
500 450 400 350 300 250 200 150 100 50 IL = 10mA 50 25 0 75 TEMPERATURE (C) IL = 1mA IL = 50mA IL = 500mA IL = 250mA IL = 100mA
= TEST POINTS
50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA)
3028 G05
0 -50 -25
100
125
3028 G06
3028f
LT3028 TYPICAL PERFOR A CE CHARACTERISTICS
Quiescent Current (Per Output)
50 45 1.240 1.235
QUIESCENT CURRENT (A)
QUIESCENT CURRENT (A)
40 35 30 25 20 15 10 5 VIN = 6V RL = 250k, IL = 5A 0 0 25 -50 -25 VSHDN = VIN
ADJ PIN VOLTAGE (V)
50
75
TEMPERATURE (C)
3028 G07
Output 2 GND Pin Current
2.50 2.25 TJ = 25C *FOR VOUT = 1.22V 2.50 2.25
GND PIN CURRENT (mA)
GND PIN CURRENT (mA)
2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0 0 1 2
1.75 1.50 1.25 1.00 0.75 0.50 0.25 0
GND PIN CURRENT (A)
RL = 12.2 IL = 100mA*
RL = 24.4 IL = 50mA*
RL = 1.22k IL = 1mA*
RL = 122 IL = 10mA* 8 9 10
34567 INPUT VOLTAGE (V)
Output 1 GND Pin Current
12 10
GND PIN CURRENT (mA)
12
8 6 4 2 0
RL = 2.44 IL = 500mA* RL = 4.07 IL = 300mA*
SHDN PIN THRESHOLD (V)
TJ = 25C VIN = VSHDN *FOR VOUT = 1.22V
GND PIN CURRENT (mA)
RL = 12.2 IL = 100mA*
0
1
2
34567 INPUT VOLTAGE (V)
UW
100
3028 G10
ADJ1 or ADJ2 Pin Voltage
IL = 1mA 40
Quiescent Current (Per Output)
TJ = 25C 35 RL = 250k 30 25 20 15 10 5 0 VSHDN = 0V 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V)
3028 G09
1.230 1.225 1.220 1.215 1.210 1.205
VSHDN = VIN
125
1.200 -50 -25
0
25
50
75
100
125
TEMPERATURE (C)
3028 G08
Output 2 GND Pin Current vs ILOAD
VIN = VOUT(NOMINAL) + 1V TJ = 25C 1200 1000 800 600 400 200 0
Output 1 GND Pin Current
2.00
RL = 24.4 IL = 50mA* TJ = 25C VIN = VSHDN *FOR VOUT = 1.22V RL = 122 IL = 10mA* RL = 1.22k IL = 1mA* 0 1 2 34567 INPUT VOLTAGE (V) 8 9 10
0
10 20 30 40 50 60 70 80 90 100 OUTPUT CURRENT (mA)
3028 G11
3028 G12
Output 1 GND Pin Current vs ILOAD
VIN = VOUT(NOMINAL) + 1V TJ = 25C
1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1
SHDN1 or SHDN2 Pin Threshold (On-to-Off)
IL = 1mA
10 8 6 4 2 0
8
9
10
0
50 100 150 200 250 300 350 400 450 500 OUTPUT CURRENT (mA)
3028 G14
0 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
3028 G13
3028 G15
3028f
5
LT3028 TYPICAL PERFOR A CE CHARACTERISTICS
SHDN1 or SHDN2 Pin Threshold (Off-to-On)
1.0 0.9
SHDN PIN INPUT CURRENT (A)
SHDN PIN THRESHOLD (V)
0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -50 -25
IL = FULL
0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0
SHDN PIN INPUT CURRENT (A)
IL = 1mA
50 25 0 75 TEMPERATURE (C)
ADJ1 or ADJ2 Pin Bias Current
100 90
SHORT-CIRCUIT CURRENT (mA)
ADJ PIN BIAS CURRENT (nA)
80 70 60 50 40 30 20 10 0 -50 -25 50 25 0 75 TEMPERATURE (C) 100 125
250 200 150 100 50 0 0 1 4 3 2 5 INPUT VOLTAGE (V) 6 7
3028 G20
CURRENT LIMIT (mA)
Output 1 Current Limit
1.0 VOUT1 = 0V 0.9 TJ = 25C 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 1 4 3 2 5 INPUT VOLTAGE (V) 6 7
3028 G22
CURRENT LIMIT (A)
CURRENT LIMIT (A)
6
UW
100
3028 G16
3028 G19
SHDN1 or SHDN2 Pin Input Current
1.0 0.9 TJ = 25C
1.4 1.2 1.0 0.8 0.6 0.4 0.2
SHDN1 or SHDN2 Pin Input Current
VSHDN = 20V
125
0
1
2
345678 SHDN PIN VOLTAGE (V)
9
10
0 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
3028 G17
3028 G18
Output 2 Current Limit
350 300 VOUT2 = 0V TJ = 25C 350 300 250 200 150 100 50
Output 2 Current Limit
VIN2 = 7V VOUT2 = 0V
0 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
3028 G21
Output 1 Current Limit
1.2 1.0 0.8 0.6 0.4 0.2 0 -50 -25 VIN1 = 7V VOUT1 = 0V
50 25 0 75 TEMPERATURE (C)
100
125
3028 G23
3028f
LT3028 TYPICAL PERFOR A CE CHARACTERISTICS
Output 2 Input Ripple Rejection
80 70
RIPPLE REJECTION (dB) 80 70 CBYP = 0.01F CBYP = 1000pF CBYP = 100pF
50 40 30 COUT = 1F COUT = 10F
RIPPLE REJECTION (dB)
50 40 30
RIPPLE REJECTION (dB)
60
20 I = 100mA L V = 2.3V + 50mVRMS RIPPLE 10 CIN2 = 0 BYP TJ = 25C 0 0.1 0.01 1 10 FREQUENCY (kHz)
Output 1 Input Ripple Rejection
80 70 80
RIPPLE REJECTION (dB)
50 40 30
COUT = 10F
RIPPLE REJECTION (dB)
50 CBYP = 1000pF 40 30 IL = 500mA 20 V = V IN1 OUT1(NOMINAL) + 1V + 50mVRMS RIPPLE 10 COUT = 10F TJ = 25C 0 100 10 1k 10k FREQUENCY (Hz) CBYP = 100pF
RIPPLE REJECTION (dB)
60
IL = 500mA 20 V = V IN1 OUT1(NOMINAL) + COUT = 4.7F 1V + 50mVRMS RIPPLE 10 C BYP = 0 TJ = 25C 0 100 100k 10 1k 10k 1M FREQUENCY (Hz)
3028 G29
Output 2 Minimum Input Voltage
2.5 VOUT2 = 1.22V
MINIMUM INPUT VOLTAGE (V) MINIMUM INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25
2.0 IL = 100mA 1.5 IL = 50mA 1.0
0.5
0 -50 -25
UW
100
3028 G26
Output 2 Input Ripple Rejection
80 70 60 50 40 30
Output 2 Input Ripple Rejection
60
1000
20 I = 100mA L VIN2 = 2.3V + 50mVRMS RIPPLE 10 C OUT = 10F TJ = 25C 0 0.1 0.01 1 10 FREQUENCY (kHz)
100
1000
3028 G27
20 VIN2 = VOUT2(NOMINAL) + 1V + 0.5VP-P RIPPLE 10 AT f = 120Hz IL = 50mA 0 0 50 25 -50 -25
75
100
125
TEMPERATURE (C)
3028 G28
Output 1 Input Ripple Rejection
68 66 64 62 60 58 56 54
100k 1M
3028 G30
Output 1 Ripple Rejection
70 CBYP = 0.01F 60
52 -50 -25
VIN1 = VOUT1(NOMINAL) + 1V + 0.5VP-P RIPPLE AT f = 120Hz IL = 500mA 0 25 50 75 100 125 TEMPERATURE (C)
3028 G31
Output 1 Minimum Input Voltage
VOUT1 = 1.22V IL = 500mA
IL = 1mA
50 25 0 75 TEMPERATURE (C)
100
125
0 -50 -25
50 25 0 75 TEMPERATURE (C)
100
125
3028 G32
3028 G33
3028f
7
LT3028 TYPICAL PERFOR A CE CHARACTERISTICS
Channel-to-Channel Isolation
100
CHANNEL-TO-CHANNEL ISOLATION (dB)
90 80 70
CHANNEL 2 LOAD REGULATION (mV)
CHANNEL 1 60 50 GIVEN CHANNEL IS TESTED 30 WITH 50mVRMS SIGNAL ON OPPOSING CHANNEL, BOTH 20 CHANNELS DELIVERING FULL 10 CURRENT TJ = 25C 0 100 1k 10k 10 FREQUENCY (Hz) 40
100k
Output 1 Load Regulation
OUTPUT NOISE SPECTRAL DENSITY (V/Hz) 5 IL = 1mA TO 500mA
10
OUTPUT NOISE SPECTRAL DENSITY (V/Hz)
LOAD REGULATION (mV)
0
-5
-10 -50 -25
0
25
50
75
TEMPERATURE (C)
3028 G36
RMS Output Noise vs Bypass Capacitor
140 120
OUTPUT NOISE (VRMS)
VOUT = 5V
OUTPUT NOISE (VRMS)
100 OUTPUT 2 80 OUTPUT 1 60 40 OUTPUT 1 20 0 10 100 CBYP (pF)
3028 G39
100 VOUT2 SET FOR 5V 80 60 40 20 VOUT2 SET FOR 5V VOUT2 =VADJ2 0.1 1 10 LOAD CURRENT (mA) 100
3028 G40
OUTPUT NOISE (VRMS)
COUT = 10F IL = FULL LOAD fBW = 10Hz TO 100kHz TJ = 25C
VOUT = 1.22V OUTPUT 2
1000
8
UW
3028 G34
Channel-to-Channel Isolation
0 -1
VOUT1 20mV/DIV
Output 2 Load Regulation
-2 -3 -4 -5 -6 -7 -8
COUT1 = 22F 50s/DIV COUT2 = 10F CBYP1 = CBYP2 = 0.01F IL1 = 50mA TO 500mA IL2 = 10mA TO 100mA VIN = 6V, VOUT1 = VOUT2 = 5V
3028 G50
VOUT2 20mV/DIV
1M
IL = 1mA TO 100mA -10 0 50 75 25 -50 -25 TEMPERATURE (C)
-9
100
125
3028 G35
Output Noise Spectral Density
10
Output Noise Spectral Density
COUT = 10F IL = FULL LOAD TJ = 25C VOUT SET FOR 5V 1 CBYP = 1000pF CBYP = 100pF VOUT =VADJ 0.1 CBYP = 0.01F
COUT = 10F CBYP = 0 IL = FULL LOAD TJ = 25C VOUT SET FOR 5V VOUT =VADJ
1
0.1
100
125
0.01 0.01
0.1
1 10 FREQUENCY (kHz)
100
3028 G37
0.01 0.01
0.1
1 10 FREQUENCY (kHz)
100
3028 G38
Output 2 RMS Output Noise vs Load Current (10Hz to 100kHz)
160 COUT2 = 10F 140 TJ = 25C CBYP = 0 CBYP = 0.01F 120
Output 1 RMS Output Noise vs Load Current (10Hz to 100kHz)
160 140 120 100 80 60 40 20 0 0.01 0.1 VOUT1 SET FOR 5V VOUT1 = VADJ1 10 100 1 LOAD CURRENT (mA) 1000
3028 G41
COUT1 = 10F TJ = 25C CBYP = 0 CBYP = 0.01F
VOUT1 SET FOR 5V
VOUT2 =VADJ2
VOUT1 = VADJ1
10000
0 0.01
3028f
LT3028 TYPICAL PERFOR A CE CHARACTERISTICS
10Hz to 100kHz Output Noise CBYP = 0pF 10Hz to 100kHz Output Noise CBYP = 100pF 10Hz to 100kHz Output Noise CBYP = 1000pF
VOUT 100V/DIV
1ms/DIV COUT = 10F IL = FULL LOAD VOUT SET FOR 5V
10Hz to 100kHz Output Noise CBYP = 0.01F
OUTPUT VOLTAGE DEVIATION (V)
VOUT 100V/DIV
-0.1 -0.2
OUTPUT VOLTAGE DEVIATION (V)
LOAD CURRENT (mA)
100 50 0 0 400 800 1200 TIME (s) 1600 2000
3028 G46
LOAD CURRENT (mA)
COUT = 10F 1ms/DIV IL = FULL LOAD VOUT SET FOR 5V
Output 1 Transient Response CBYP = 0pF
OUTPUT VOLTAGE DEVIATION (V)
OUTPUT VOLTAGE DEVIATION (V)
VIN1 = 6V, VOUT1 SET FOR 5V 0.4 CIN1 = 10F COUT1 = 10F 0.2 T = 25C J 0 -0.2 -0.4
LOAD CURRENT (mA)
600 400 200 0 0 200 400 600 TIME (s) 800 1000
3028 G48
LOAD CURRENT (mA)
UW
VOUT 100V/DIV
VOUT 100V/DIV
3028 G42
1ms/DIV COUT = 10F IL = FULL LOAD VOUT SET FOR 5V
3028 G43
COUT = 10F 1ms/DIV IL = FULL LOAD VOUT SET FOR 5V
3028 G44
Output 2 Transient Response CBYP = 0pF
VIN2 = 6V, VOUT2 SET FOR 5V 0.2 CIN2 = 10F COUT2 = 10F 0.1 T = 25C J 0
Output 2 Transient Response CBYP = 0.01F
VIN2 = 6V, VOUT2 SET FOR 5V 0.04 CIN2 = 10F COUT2 = 10F 0.02 T = 25C J 0 -0.02 -0.04
100 50 0 0 20 40 60 80 100 120 140 160 180 200 TIME (s)
3028 G47
3028 G45
Output 1 Transient Response CBYP = 0.01F
VIN1 = 6V, VOUT1 SET FOR 5V 0.10 CIN1 = 10F COUT1 = 10F 0.05 T = 25C J 0 -0.05 -0.10
600 400 200 0 0 10 20 30 40 50 60 70 80 90 100 TIME (s)
3028 G49
3028f
9
LT3028
PI FU CTIO S
GND (Pins 5, 17)/(Pins 1, 5, 8, 9, 16, 17): Ground. The Exposed Pad must be soldered to PCB ground for optimum thermal performance. ADJ1/ADJ2 (Pins 16/9)/(Pins 15/10): Adjust Pin. These are the inputs to the error amplifiers. These pins are internally clamped to 7V. They have a bias current of 30nA which flows into the pin (see curve of ADJ1/ADJ2 Pin Bias Current vs Temperature in the Typical Performance Characteristics section). The ADJ1 and ADJ2 pin voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V. BYP1/BYP2 (Pins 1/8)/(Pins 2/7): Bypass. The BYP1/BYP2 pins are used to bypass the reference of the LT3028 regulator to achieve low noise performance from the regulator. The BYP1/BYP2 pins are clamped internally to 0.6V (one VBE) from ground. A small capacitor from the corresponding output to this pin will bypass the reference to lower the output voltage noise. A maximum value of 0.01F can be used for reducing output voltage noise to a typical 20VRMS over a 10Hz to 100kHz bandwidth. If not used, this pin must be left unconnected. OUT1/OUT2 (Pins 3, 4/6, 7)/(Pins 3, 4/6): Output. The outputs supply power to the loads. A minimum output capacitor of 1F is required to prevent oscillations on Output 2; Output 1 requires a minimum of 3.3F. Larger output capacitors will be required for applications with large transient loads to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse output characteristics.
APPLICATIO S I FOR ATIO
The LT3028 is a dual 100mA/500mA low dropout regulator with independent inputs, micropower quiescent current, and shutdown. The device is capable of supplying 100mA from Output 2 at a dropout voltage of 300mV. Output 1 delivers 500mA at a dropout voltage of 320mV. The two regulators have common GND pins and are thermally coupled, however, the two inputs and outputs of the LT3028 operate independently. They can be shut down
10
U
W
UU
U
U
U
(DFN Package)/(TSSOP Package)
SHDN1/SHDN2 (Pins 15/10)/(Pins 14/11): Shutdown. The SHDN1/SHDN2 pins are used to put the corresponding output of the LT3028 regulator into a low power shutdown state. The output will be off when the pin is pulled low. The SHDN1/SHDN2 pins can be driven either by 5V logic or open-collector logic with pull-up resistors. The pull-up resistors are required to supply the pull-up current of the open-collector gates, normally several microamperes, and the SHDN1/SHDN2 pin current, typically 1A. If unused, the pin must be connected to VIN. The device will not function if the SHDN1/SHDN2 pins are not connected. IN1/IN2 (Pins 13, 14/11, 12)/(Pins 13/12): Inputs. Power is supplied to the device through the IN pins. A bypass capacitor is required on these pins if the device is more than six inches away from the main input filter capacitor. In general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. A bypass capacitor in the range of 1F to 10F is sufficient. The LT3028 regulator is designed to withstand reverse voltages on the IN pins with respect to ground and the OUT pins. In the case of a reverse input, which can happen if a battery is plugged in backwards, the device will act as if there is a diode in series with its input. There will be no reverse current flow into the regulator and no reverse voltage will appear at the load. The device will protect both itself and the load.
independently and a fault condition on one output will not affect the other output electrically. Output voltage noise can be lowered to 20VRMS over a 10Hz to 100kHz bandwidth with the addition of a 0.01F reference bypass capacitor. Additionally, the reference bypass capacitor will improve transient response of the regulator, lowering the settling time for transient load conditions. The low operating quiescent current (30A per output) drops to less
3028f
LT3028
APPLICATIO S I FOR ATIO
than 1A in shutdown. In addition to the low quiescent current, the LT3028 regulator incorporates several protection features which make it ideal for use in batterypowered systems. The device is protected against reverse input voltages. Additionally, in dual supply applications where the regulator load is returned to a negative supply, the output can be pulled below ground by as much as 20V and still allow the device to start and operate. Adjustable Operation The LT3028 has an output voltage range of 1.22V to 20V. The output voltage is set by the ratio of two external resistors as shown in Figure 1. The device servos the output to maintain the corresponding ADJ pin voltage at 1.22V referenced to ground. The current in R1 is then equal to 1.22V/R1 and the current in R2 is the current in R1 plus the ADJ pin bias current. The ADJ pin bias current, 30nA at 25C, flows through R2 into the ADJ pin. The output voltage can be calculated using the formula in Figure 1. The value of R1 should be no greater than 250k to minimize errors in the output voltage caused by the ADJ pin bias current. Note that in shutdown the output is turned off and the divider current will be zero. Curves of ADJ Pin Voltage vs Temperature and ADJ Pin Bias Current vs Temperature appear in the Typical Performance Characteristics. The device is tested and specified with the ADJ pin tied to the corresponding OUT pin for an output voltage of 1.22V. Specifications for output voltages greater than 1.22V will be proportional to the ratio of the desired output voltage to 1.22V: VOUT/1.22V. For example, load regulation on Output 2 for an output current change of 1mA to 100mA
OUT1/OUT2 IN1/IN2 VIN LT3028 ADJ1/ADJ2 GND R1
3024 F01
VOUT
+
R2
R2 VOUT = 1.22V 1 + + (IADJ )(R2) R1 VADJ = 1.22V IADJ = 30nA AT 25C OUTPUT RANGE = 1.22V TO 20 V
Figure 1. Adjustable Operation
U
is -1mV typical at VOUT = 1.22V. At VOUT = 12V, load regulation is: (12V/1.22V)(-1mV) = - 9.8mV Bypass Capacitance and Low Noise Performance The LT3028 regulator may be used with the addition of a bypass capacitor from VOUT to the corresponding BYP pin to lower output voltage noise. A good quality low leakage capacitor is recommended. This capacitor will bypass the reference of the regulator, providing a low frequency noise pole. The noise pole provided by this bypass capacitor will lower the output voltage noise to as low as 20VRMS with the addition of a 0.01F bypass capacitor. Using a bypass capacitor has the added benefit of improving transient response. With no bypass capacitor and a 10F output capacitor, a 10mA to 100mA load step on Output 2 will settle to within 1% of its final value in less than 100s. With the addition of a 0.01F bypass capacitor, the output will stay within 1% for the same load step. Both outputs exhibit this improvement in transient response (see Transient Reponse in Typical Performance Characteristics section). However, regulator start-up time is inversely proportional to the size of the bypass capacitor, slowing to 15ms with a 0.01F bypass capacitor and 10F output capacitor. Output Capacitance and Transient Response The LT3028 regulator is designed to be stable with a wide range of output capacitors. The ESR of the output capacitor affects stability, most notably with small capacitors. A minimum output capacitor of 1F with an ESR of 3 or less is recommended for Output 2 to prevent oscillations. A minimum output capacitor of 3.3F with an ESR of 3 or less is recommended for Output 1. The LT3028 is a micropower device and output transient response will be a function of output capacitance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT3028, will increase the effective output capacitor value. With larger capacitors
3028f
W
UU
11
LT3028
APPLICATIO S I FOR ATIO
used to bypass the reference (for low noise operation), larger values of output capacitors are needed. For 100pF of bypass capacitance on Output 2, 2.2F of output capacitor is recommended. With a 330pF bypass capacitor or larger on this output, a 3.3F output capacitor is recommended. For Output 1, 4.7F of output capacitor is recommended for 100pF of bypass capacitance. With 1000pF or larger bypass capacitor on this output, a 6.8F output capacitor is recommended. The shaded region of Figures 2 and 3 define the regions over which the LT3028 regulator is stable. The minimum ESR needed is defined by the amount of bypass capacitance used, while the maximum ESR is 3.
4.0 3.5 3.0 STABLE REGION 2.5
ESR ()
ESR ()
2.0 1.5 1.0 0.5 0 1 3 2 4 5 6 7 8 9 10 OUTPUT CAPACITANCE (F)
3028 F02
CBYP = 0 CBYP = 100pF CBYP = 330pF CBYP > 3300pF
Figure 2. Output 2 Stability
20 0
CHANGE IN VALUE (%)
BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10F
CHANGE IN VALUE (%)
X5R -20 -40 -60 Y5V -80
-100
0
2
4
8 6 10 12 DC BIAS VOLTAGE (V)
14
16
3028 F04
Figure 4. Ceramic Capacitor DC Bias Characteristics
12
U
Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong voltage and temperature coefficients as shown in Figures 4 and 5. When used with a 5V regulator, a 10F Y5V capacitor can exhibit an effective value as low as 1F to 2F over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is available in higher values.
4.0 3.5 3.0 STABLE REGION 2.5 2.0 1.5 1.0 0.5 0 1 3 2 4 5 6 7 8 9 10 OUTPUT CAPACITANCE (F)
3028 F03
W
UU
CBYP = 0 CBYP = 100pF CBYP = 330pF CBYP 1000pF
Figure 3. Output 1 Stability
40 20 0 -20 -40 -60 -80 Y5V X5R
BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10F -100 50 25 75 -50 -25 0 TEMPERATURE (C)
100
125
3028 F05
Figure 5. Ceramic Capacitor Temperature Characteristics
3028f
LT3028
APPLICATIO S I FOR ATIO
Voltage and temperature coefficients are not the only sources of problems. Some ceramic capacitors have a piezoelectric response. A piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or microphone works. For a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. The resulting voltages produced can cause appreciable amounts of noise, especially when a ceramic capacitor is used for noise bypassing. A ceramic capacitor produced Figure 6's trace in response to light tapping from a pencil. Similar vibration induced behavior can masquerade as increased output voltage noise.
COUT = 10F CBYP = 0.01F ILOAD = 100mA
VOUT 500V/DIV
100ms/DIV
3028 F05
Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor
Thermal Considerations The power handling capability of the device will be limited by the maximum rated junction temperature (125C). The power dissipated by the device will be made up of two components for each output: 1. Output current multiplied by the input/output voltage differential: (IOUT)(VIN - VOUT), and 2. GND pin current multiplied by the input voltage: (IGND)(VIN). The ground pin current can be found by examining the GND Pin Current curves in the Typical Performance Characteristics section. Power dissipation will be equal to the sum of the two components listed above. The LT3028 regulator has internal thermal limiting designed to protect the device during overload conditions.
U
For continuous normal conditions, the maximum junction temperature rating of 125C must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. Additional heat sources mounted nearby must also be considered. For surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the PC board and its copper traces. Copper board stiffeners and plated through-holes can also be used to spread the heat generated by power devices. The following tables list thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 3/32" FR-4 board with one ounce copper.
Table 1. FE Package, 16-Lead TSSOP
COPPER AREA TOPSIDE* BACKSIDE 2500mm2 1000mm 225mm
2 2
W
UU
BOARD AREA 2500mm2 2500mm 2500mm
2 2
THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 38C/W 43C/W 48C/W 60C/W
2500mm2 2500mm 2500mm
2 2
100mm2
2500mm2
2500mm2
*Device is mounted on topside.
Table 2. DHC Package, 16-Lead DFN
COPPER AREA TOPSIDE* BACKSIDE 2500mm2 1000mm 225mm 100mm
2 2 2
BOARD AREA 2500mm2 2500mm2 2500mm 2500mm
2 2
THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 40C/W 45C/W 50C/W 62C/W
2500mm2 2500mm 2500mm 2500mm
2 2 2
*Device is mounted on topside.
The thermal resistance junction-to-case (JC), measured at the Exposed Pad on the back of the die is 10C/W for the DFN package and 8C/W for the TSSOP package. Calculating Junction Temperature Example: Given Output 1 set for an output voltage of 3.3V, Output 2 set for an output voltage of 2.5V, an input voltage range of 3.8V to 5V, an output current range of 0mA to 500mA for Output 1, an output current range of 0mA to 100mA for Output 2 and a maximum ambient temperature of 50C, what will the maximum junction temperature be?
3028f
13
LT3028
APPLICATIONS INFORMATION
The power dissipated by each output will be equal to: IOUT(MAX)(VIN(MAX) - VOUT) + IGND(VIN(MAX)) Where for Output 1: IOUT(MAX) = 500mA VIN(MAX) = 5V IGND at (IOUT = 500mA, VIN = 5V) = 9mA For Output 2: IOUT(MAX) = 100mA VIN(MAX) = 5V IGND at (IOUT = 100mA, VIN = 5V) = 2mA So for Output 1: P = 500mA (5V - 3.3V) + 9mA (5V) = 0.90W For Output 2: P = 100mA (5V - 2.5V) + 2mA (5V) = 0.26W The thermal resistance will be in the range of 35C/W to 55C/W depending on the copper area. So the junction temperature rise above ambient will be approximately equal to: (0.90W + 0.26W) 50C/W = 57.8C The maximum junction temperature will then be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: TJMAX = 50C + 57.8C = 107.8C Protection Features The LT3028 regulator incorporates several protection features which make it ideal for use in battery-powered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the device is protected against reverse input voltages and reverse voltages from output to input. The two regulators have common inputs and GND pins and are thermally coupled, however, the two outputs of the LT3028 operate independently. They can be shut down independently and a fault condition on one output will not affect the other output electrically. Current limit protection and thermal overload protection are intended to protect the device against current overload conditions at the output of the device. For normal operation, the junction temperature should not exceed 125C. The input of the device will withstand reverse voltages of 20V. Current flow into the device will be limited to less than 1mA (typically less than 100A) and no negative voltage will appear at the output. The device will protect both itself and the load. This provides protection against batteries which can be plugged in backward. The output of the LT3028 can be pulled below ground without damaging the device. If the input is left open circuit or grounded, the output can be pulled below ground by 20V. The output will act like an open circuit; no current will flow out of the pin. If the input is powered by a voltage source, the output will source the short-circuit current of the device and will protect itself by thermal limiting. In this case, grounding the SHDN1/SHDN2 pins will turn off the device and stop the output from sourcing the short-circuit current. The ADJ pins can be pulled above or below ground by as much as 7V without damaging the device. If the input is left open circuit or grounded, the ADJ pins will act like an open circuit when pulled below ground and like a large resistor (typically 100k) in series with a diode when pulled above ground. In situations where the ADJ pins are connected to a resistor divider that would pull the pins above their 7V clamp voltage if the output is pulled high, the ADJ pin input current must be limited to less than 5mA. For example, a resistor divider is used to provide a regulated 1.5V output from the 1.22V reference when the output is forced to 20V. The top resistor of the resistor divider must be chosen to limit the current into the ADJ pin to less than 5mA when the ADJ pin is at 7V. The 13V difference between output and ADJ pin divided by the 5mA maximum current into the ADJ pin yields a minimum top resistor value of 2.6k.
14
U
W
U
U
3028f
LT3028
APPLICATIONS INFORMATION
In circuits where a backup battery is required, several different input/output conditions can occur. The output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage or is left open circuit. When the IN pin of the LT3028 is forced below either OUT pin or either OUT pin is pulled above the IN pin, input current for the corresponding regulator will typically drop to less than 2A. This can happen if the input of the device is connected to a discharged (low voltage) battery and the output is held up by either a backup battery or a second regulator circuit. The state of the SHDN1/SHDN2 pin will have no effect on the reverse output current when the output is pulled above the input.
PACKAGE DESCRIPTIO
FE Package 16-Lead Plastic TSSOP (4.4mm)
(Reference LTC DWG # 05-08-1663)
3.58 (.141)
6.60 0.10 4.50 0.10
SEE NOTE 4
2.94 (.116) 0.45 0.05 1.05 0.10 0.65 BSC 2.94 6.40 (.116) (.252) BSC
RECOMMENDED SOLDER PAD LAYOUT
4.30 - 4.50* (.169 - .177)
0.09 - 0.20 (.0035 - .0079)
0.50 - 0.75 (.020 - .030)
NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN (INCHES) 3. DRAWING NOT TO SCALE
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
W
U
U
Exposed Pad Variation BB
4.90 - 5.10* (.193 - .201) 3.58 (.141) 16 1514 13 12 1110 9
12345678 1.10 (.0433) MAX
0 - 8
0.25 REF
0.65 (.0256) BSC
0.195 - 0.30 (.0077 - .0118) TYP
0.05 - 0.15 (.002 - .006)
FE16 (BB) TSSOP 0204
4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE
3028f
15
LT3028
PACKAGE DESCRIPTIO
3.50 0.05
1.65 0.05 (2 SIDES)
2.20 0.05
0.25 0.05 0.50 BSC 4.40 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC PACKAGE OUTLINE MO-229 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS
RELATED PARTS
PART NUMBER LT1129 LT1175 DESCRIPTION 700mA, Micropower, LDO 500mA, Micropower Negative LDO COMMENTS VIN: 4.2V to 30V, VOUT(MIN) = 3.75V, IQ = 50A, ISD < 16A, DD, SOT-223, S8,TO220, TSSOP20 Packages Guaranteed Voltage Tolerance and Line/Load Regulation VIN: -20V to -4.3V, VOUT(MIN) = -3.8V, IQ = 45A, ISD < 10A, DD,SOT-223, S8 Packages Accurate Programmable Current Limit, Remote Sense VIN: -35V to -4.2V, VOUT(MIN) = -2.40V, IQ = 2.5mA, ISD < 1A, TO220-5 Package Low Noise < 20VRMS, Stable with 1F Ceramic Capacitors, VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 20A, ISD < 1A, ThinSOT Package Low Noise < 20VRMS, VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 25A, ISD < 1A, MS8 Package Low Noise < 20VRMS, VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 30A, ISD < 1A, S8 Package Low Noise < 40VRMS, "A" Version Stable with Ceramic Capacitors, VIN: 2.7V to 20V, VOUT(MIN) = 1.21V, IQ = 1mA, ISD < 1A, DD, TO220 Packages Low Noise < 30VRMS, Stable with 1F Ceramic Capacitors, VIN: 1.6V to 6.5V, VOUT(MIN) = 1.25V, IQ = 40A, ISD < 1A, ThinSOT Package Low Noise < 20VRMS, VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 30A, ISD < 1A, MS8 Package Low Noise < 40VRMS, "A" Version Stable with Ceramic Capacitors, VIN: 2.1V to 20V, VOUT(MIN) = 1.21V, IQ = 1mA, ISD < 1A, DD, TO220, SOT-223, S8 Packages Low Noise < 30VRMS, Stable with Ceramic Capacitors, VIN: -0.9V to -20V, VOUT(MIN) = -1.21V, IQ = 30A, ISD < 3A, ThinSOT Package Low Noise < 20VRMS, Stable with 1F Ceramic Capacitors, VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 40A, ISD < 1A, MS10E, DFN Packages Low Noise < 20VRMS, Stable with 1F Ceramic Capacitors, VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, IQ = 30A, ISD < 1A, DFN, TSSOP Packages
3028f
LT1185 LT1761 LT1762 LT1763 LT1764/LT1764A LTC1844 LT1962 LT1963/LT1963A
3A, Negative LDO 100mA, Low Noise Micropower, LDO 150mA, Low Noise Micropower, LDO 500mA, Low Noise Micropower, LDO 3A, Low Noise, Fast Transient Response, LDO 150mA, Very Low Drop-Out LDO 300mA, Low Noise Micropower, LDO 1.5A, Low Noise, Fast Transient Response, LDO
LT1964 LT3023 LT3024
200mA, Low Noise Micropower, Negative LDO Dual 100mA, Low Noise, Micropower LDO Dual 100mA/500mA, Low Noise, Micropower LDO
16
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 FAX: (408) 434-0507
U
DHC Package 16-Lead Plastic DFN (5mm x 3mm)
(Reference LTC DWG # 05-08-1706)
5.00 0.10 (2 SIDES) 0.65 0.05 3.00 0.10 (2 SIDES) PACKAGE OUTLINE 1.65 0.10 (2 SIDES) PIN 1 NOTCH
(DHC16) DFN 1103
R = 0.115 TYP R = 0.20 TYP 9 16
0.40 0.10
PIN 1 TOP MARK (SEE NOTE 6) 8 0.200 REF 0.75 0.05 4.40 0.10 (2 SIDES) BOTTOM VIEW--EXPOSED PAD 1 0.25 0.05 0.50 BSC
0.00 - 0.05
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE
LT/TP 0904 1K * PRINTED IN USA
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2004

▲Up To Search▲

Price & Availability of LT3028EFE

	To Download LT3028EFE Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .