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UTC LD1985
LINEAR INTEGRATED CIRCUIT
VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION
DESCRIPTION
The UTC LD1985 is a 150mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1A when INHIBIT pin is pulled low. Shutdown Logic Control Function is available on pin 3 (TTL compatible). This means that when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption. An external capacitor, CBYP=10nF, connected between bypass pin and GND reduce the noise to 30Vrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera.
2 3
1
5 4 SOT-25
1:VIN 4:Bypass
2:GND 5:VOUT
3:INHIBIT
FEATURES
*VERY LOW DROPOUT VOLTAGE (280mV at 150mA AND 7mV at 1mA LOAD) *VERY LOW QUIESCENT CURRENT (2mA Typ. at 150mA LOAD AND 80A at NO LOAD) *OUTPUT CURRENT UP TO 150mA *LOGIC CONTROLLED ELECTRONIC SHUTDOWN *OUTPUT VOLTAGE OF 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5V *INTERNAL CURRENT AND THERMAL LIMIT *AVAILABLE IN 1% TOLLERANCE (at 25, A VERSION) *LOW OUTPUT NOISE VOLTAGE 30Vrms
PIN DESCRIPTION
PIN NO.
1 2
PIN NAME
IN GND
FUNCTION
3
4
5
Input Port Ground Pin Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left INHIBIT floating. Disable the device when connected to GND or to a positive voltage less than 0.18V Bypass Pin: Capacitor to be connected to GND in Bypass order to improve the thermal noise performances. OUT Output Port
UTC
UNISONIC TECHNOLOGIES CO., LTD.
1
QW-R102-021,B
UTC LD1985
MARKING INFORMATION
PART NUMBER
LD1985-1.5V LD1985-1.8V LD1985-2.5V LD1985-2.8V LD1985-2.85V LD1985-3.0V LD1985-3.1V LD1985-3.2V
LINEAR INTEGRATED CIRCUIT
VOLTAGE CODE
15 18 25 28 2J 30 31 32
VOLTAGE
1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.1V 3.2V
PART NUMBER
LD1985-3.3V LD1985-3.5V LD1985-3.6V LD1985-3.8V LD1985-4.0V LD1985-4.7V LD1985-5.0V
VOLTAGE
3.3V 3.5V 3.6V 3.8V 4.0V 4.7V 5.0V
VOLTAGE CODE
33 35 36 38 40 47 50
3 2
MARKING
1
LD
VOLTAGE CODE
4
5
BLOCK DIAGRAM
Vin CURRENT LIMIT Vout
SHDN
START-UP SHUTDOWN
REFERENCE VOLTAGE
ERROR AMPLIFIER
DRIVER
BYPASS
TERM. PROTEC.
GND
ABSOLUTE MAXIMUM RATINGS
PARAMETER
DC Input Voltage INHIBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range
SYMBOL
Vi VINH Io Ptot Tstg Top
RATINGS
7 7 Internally limited Internally limited -65 ~ +150 -40 ~ +125
UNIT
V V

THERMAL DATA
PARAMETER
Thermal Resistance Junction-case
SYMBOL
Rthj-case
RATINGS
81
UNIT
/W
UTC
UNISONIC TECHNOLOGIES CO., LTD.
2
QW-R102-021,B
UTC LD1985
PARAMETER
Operating Input Voltage Output Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vop Vo
ELECTRICAL CHARACTERISTICS FOR LD1985 VO1.0%
(TJ=25, Vi=Vo+1V, Io=1mA, VSHDN=2V, Ci=1F, Co=1F, unless otherwise specified)
TEST CONDITIONS
Vi=2.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=2.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=3.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125
MIN
2.5 1.485 1.462 1.447 1.782 1.755 1.737 2.475 2.4375 2.4125 2.772 2.730 2.702 2.821 2.778 2.750 2.970 2.925 2.895 3.069 3.022 2.9915 3.168 3.120 3.088 3.267 3.2175 3.1845 3.465 3.412 3.377 3.564 3.510 3.474 3.762 3.705 3.667 3.96 3.9 3.86 4.653 4.582 4.5355 4.95 4.875 4.825
TYP
1.5
MAX
7 1.515 1.538 1.553 1.818 1.845 1.863 2.525 2.5625 2.5875 2.828 2.870 2.898 2.879 2.921 2.950 3.030 3.075 3.105 3.131 3.1775 3.2085 3.232 3.280 3.312 3.333 3.3825 3.4155 3.535 3.587 3.622 3.636 3.690 3.726 3.838 3.895 3.933 4.04 4.1 4.14 4.747 4.817 4.8645 5.05 5.125 5.175
UNIT
V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V
Output Voltage
Vo
1.8
Output Voltage
Vo
2.5
Output Voltage
Vo
Vi=3.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=3.85V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.1V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.2V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.3V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.6V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=5.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=5.7V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=6.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125
2.8
Output Voltage
Vo
2.85
Output Voltage
Vo
3.0
Output Voltage
Vo
3.1
Output Voltage
Vo
3.2
Output Voltage
Vo
3.3
Output Voltage
Vo
3.5
Output Voltage
Vo
3.6
Output Voltage
Vo
3.8
Output Voltage
Vo
4
Output Voltage
Vo
4.7
Output Voltage
Vo
5
UTC
UNISONIC TECHNOLOGIES CO., LTD.
3
QW-R102-021,B
UTC LD1985
PARAMETER
Short Circuit Current Line Regulation
LINEAR INTEGRATED CIRCUIT
SYMBOL
Isc Vo/Vi
TEST CONDITIONS
RL=0 Vi=Vo+1V ~ 16V, Io=1mA Vi=Vo+1V ~ 16V, Io=1mA TJ=-40 ~ 125
MIN
TYP
400 0.003
MAX
0.014 0.032
UNIT
mA %/Vi %/Vi mV mV mV mV mV mV mV mV mV mV A A A A A A A A A A A A dB V V A A V
Dropout Voltage
Vd
Io=0 TJ=-40 ~ 125, Io=0 Io=1mA Io=1mA, TJ=-40 ~ 125 Io=10mA Io=10mA, TJ=-40 ~ 125 Io=50mA Io=50mA, TJ=-40 ~ 125 Io=150mA Io=150mA, TJ=-40 ~ 125
1 7 40 120 280 80 100 200 600 2000 0
3 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 2
Quiescent Current
Id
Io=0 TJ=-40 ~ 125, Io=0 Io=1mA Io=1mA, TJ=-40 ~ 125 Io=10mA Io=10mA, TJ=-40 ~ 125 Io=50mA Io=50mA, TJ=-40 ~ 125 Io=150mA Io=150mA, TJ=-40 ~ 125 OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ=-40 ~ 125 CBYP=0.01F, Co=10F, f=1KHz TJ=-40 ~ 125 TJ=-40 ~ 125 TJ=-40 ~ 125, VSHDN=5V TJ=-40 ~ 125, VSHDN=0V B=300Hz ~ 50KHz CBYP=0.01F, Co=10F
Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage
SVR VIL VIH IiNH eN
45 0.15 2 5 0 30 15 -1
UTC
UNISONIC TECHNOLOGIES CO., LTD.
4
QW-R102-021,B
UTC LD1985
PARAMETER
Operating Input Voltage Output Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL
Vop Vo Vi=2.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=2.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=3.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=3.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=3.85V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.1V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.2V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.3V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.6V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=4.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=5.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=5.7V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125 Vi=6.0V Io=1 ~ 150mA
ELECTRICAL CHARACTERISTICS FOR LD1985 VO1.5%
(TJ=25, Vi=Vo+1V, Io=1mA, VSHDN=2V, Ci=1F, Co=1F, unless otherwise specified)
TEST CONDITIONS
MIN
2.5 1.477 1.455 1.440 1.773 1.746 1.728 2.4625 2.425 2.4 2.758 2.716 2.688 2.807 2.764 2.736 2.955 2.91 2.88 3.0535 3.007 2.976 3.152 3.104 3.072 3.2505 3.201 3.168 3.447 3.395 3.360 3.546 3.492 3.456 3.743 3.686 3.648 3.94 3.88 3.84 4.6295 4.559 4.512 4.925 4.85
TYP
1.5
MAX
7 1.523 1.545 1.560 1.827 1.854 1.872 2.5375 2.575 2.6 2.842 2.884 2.912 2.893 2.935 2.964 3.045 3.09 3.12 3.1465 3.193 3.224 3.248 3.296 3.328 3.3495 3.399 3.432 3.552 3.605 3.640 3.654 3.708 3.744 3.857 3.914 3.952 4.06 4.12 4.16 4.7705 4.841 4.888 5.075 5.15
UNIT
V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V
Output Voltage Vo Output Voltage Vo Output Voltage Vo
1.8
2.5
2.8
Output Voltage
Vo
2.85
Output Voltage
Vo
3.0
Output Voltage
Vo
3.1
Output Voltage
Vo
3.2
Output Voltage
Vo
3.3
Output Voltage
Vo
3.5
Output Voltage
Vo
3.6
Output Voltage
Vo
3.8
Output Voltage
Vo
4
Output Voltage
Vo
4.7
Output Voltage
Vo
5
UTC
UNISONIC TECHNOLOGIES CO., LTD.
5
QW-R102-021,B
UTC LD1985
PARAMETER
Short Circuit Current Line Regulation
LINEAR INTEGRATED CIRCUIT
Io=1 ~ 150mA, TJ=-40 ~ 125 4.8 5.2 V
SYMBOL
Isc Vo/Vi
TEST CONDITIONS
RL=0 Vi=Vo+1V ~ 16V, Io=1mA Vi=Vo+1V ~ 16V, Io=1mA TJ=-40 ~ 125 Io=0 TJ=-40 ~ 125, Io=0 Io=1mA Io=1mA, TJ=-40 ~ 125
MIN
TYP
400 0.03
MAX
0.014 0.032 3 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 2
UNIT
mA %/Vi %/Vi mV mV mV mV mV mV mV mV mV mV A A A A A A A A A A A A dB V V A A V
Dropout Voltage
1 7 40 120 280 80 100 200 600 2000 0
Vd
Io=10mA Io=10mA, TJ=-40 ~ 125 Io=50mA Io=50mA, TJ=-40 ~ 125 Io=150mA Io=150mA, TJ=-40 ~ 125
Quiescent Current
Id
Io=0 TJ=-40 ~ 125, Io=0 Io=1mA Io=1mA, TJ=-40 ~ 125 Io=10mA Io=10mA, TJ=-40 ~ 125 Io=50mA Io=50mA, TJ=-40 ~ 125 Io=150mA Io=150mA, TJ=-40 ~ 125 OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ=-40 ~ 125 CBYP=0.01F, Co=10F, f=1KHz TJ=-40 ~ 125 TJ=-40 ~ 125 TJ=-40 ~ 125, VSHDN=5V TJ=-40 ~ 125, VSHDN=0V B=300Hz ~ 50KHz CBYP=0.01F, Co=10F
Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage
SVR VIL VIH IiNH eN
45 0.15 2 5 0 30 15 -1
UTC
UNISONIC TECHNOLOGIES CO., LTD.
6
QW-R102-021,B
UTC LD1985
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS (TJ=25, Ci=1F, Co=2.2F, CBYP=100nF, unless otherwise specified)
UTC
UNISONIC TECHNOLOGIES CO., LTD.
7
QW-R102-021,B
UTC LD1985
2.60 2.58 2.56 2.54 Vo (V) 2.52 2.50 2.48 2.46 2.44 2.42 2.40 -50 -25 0 50 25 Tc () Vi=3.5V Io=1mA
LINEAR INTEGRATED CIRCUIT
Quiescent Current vs Load Current Vo=2.5V Cby=10nF 2000
Output Voltage vs Temperature
Iq (A)
1600
1200
800
400
75
100
125
0
0
25
50
100 75 Io (mA)
125
150
175
Dropout Voltage vs Temperature 0.4 Vo=2.5V Cby=10nF Io=150mA 0.3 3.5
Quiescent Current vs Temperature Vo=2.5V Cby=10nF Io=150mA 3.0 2.5 2.0 1.5
Vd (V)
0.2
Io=50mA
0.1 Io=10mA Io=1mA 0 -50 -25 0 50 25 Tc () 75 100 125
Iq (mA)
1.0 0.5 0 -50
-25
0
25
50 Tc ()
75
100
125
Dropout Voltage vs Output Current
Supply Voltage Rejection vs Temperature fosc=1KHz Vi=3.5 ~ 6.5V Io=10mA Co=10 F
250 Vd (mV)
90 80
200 SVR (dB)
70 Co=1 F 60 50 40 30 20 -50
150
100 Vo=2.5V
50
0
0
25
50
75 100 Io (mA)
125
150
175
-25
0
25
50 Tc ()
75
100
125
UTC
UNISONIC TECHNOLOGIES CO., LTD.
8
QW-R102-021,B
UTC LD1985
100 80
LINEAR INTEGRATED CIRCUIT
Supply Voltage Rejection vs Frequency 80 70 60
Supply Voltage Rejection vs Output Current
SVR (dB)
SVR (dB)
60
50 40 30 20
40
20
Vi=3.5 ~ 6.5V Co=10 F fosc=1KHz 0 25 50 100 75 Io (mA) 125 150 175
10
Vi=3.5 ~ 6.5V Io=10mA Vo=2.5V Co=1 F 10
2
0
0 1 10
10 f (KHz)
3
10
4
10
5
Supply Voltage Rejection vs Output Current 100
Line Transient Tek Run:5.00MS/s Average ? T
?
80
SVR (dB)
60
1
Vin
40
1
Vout
20
Vi=3.5 ~ 6.5V Co=1 F fosc=1KHz 0 25 50 100 75 Io (mA) 125 150 175
Ch1 500mV Ch2 20.0mV M 10.0s Ch1 CH2
3.96V
Vo=2.5V, Io=50mA, no C i, Co=4.7 F, tr=tf=20ns
0
Supply Voltage Rejection vs Frequency Line Transient Tek Run:5.00MS/s Average ? T ?
70 60 SVR (dB) 50 40 30 20 10
Vin 1 Vout
2
Vi=2.8 ~ 5.8V Io=10mA Vo=1.8V Co=10 F 10
2
Ch1 500mV Ch2 20.0mV M 10.0 s Ch1 CH2
3.96V
Vo=2.5V, Io=50mA, no C i, Co=4.7F, tr=tf=1s 10
3
0 1 10
10
4
10
5
f (KHz)
UTC
UNISONIC TECHNOLOGIES CO., LTD.
9
QW-R102-021,B
UTC LD1985
2
LINEAR INTEGRATED CIRCUIT
Load Transient Tek Run: 5.00MS/s Average ? T ?
Load Transient Tek Run: 5.00MS/s Average ? ? T
Iout
2
1 3 Vout Vout
Ch3 20.0mV
Ch2 50.0mV
M 10.0s
Ch2
29mV
Ch1
50.0mV
Ch2 CH2
100mV M 10.0s
Ch2
78mV
Vo=2.5V, Io=0 ~ 50mA, no C i, Co=10 F, ts=tf=2ns
Vo=2.5V, Io=50mA, no C i, Co=4.7 F, ts=tf=20ns
APPLICATION INFORMATION
EXTERNAL CAPACITORS Like any low-dropout regulator, the UTC LD1985 requires external capacitors for regulator stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We suggest to solder input and output capacitors as close as possible to the relative pins. INPUT CAPACITOR An input capacitor whose value is 1F is required with the UTC LD1985 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. OUTPUT CAPACITOR The UTC LD1985 is designed specifically to work with ceramic output capacitors. It may also be possible to use Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low E.S.R. ceramic type is used, is 1F for output voltages equal or major than 3.8V, 2.2F for VO going from 1.8 ~ 3.3V, and 3.3F for the other versions. However, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor. IMPORTANT: The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount of capacitance is provided at all times. This capacitor should be located not more than 0.5" from the output pin of the device and returned to a clean analog ground. INHIBIT INPUT OPERATION The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current consumption down to less than 1A. When the inhibit feature is not used, this pin must be tied to Vi to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH VIL. Any slew rate can be used to drive the inhibit. REVERSE CURRENT The power transistor used in the UTC LD1985 has not an inherent diode connected between the regulator input and output. If the output is forced above the input, no current will flow from the output to the input across the series pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND across the two feedback resistors. This current typical value is 160A. R1 and R2 resistors are implanted type;
UTC
UNISONIC TECHNOLOGIES CO., LTD.
10
QW-R102-021,B
UTC LD1985
LINEAR INTEGRATED CIRCUIT
Typical values are, respectively, 42.6 K and 51.150 K.
Reverse Current Test Circuit
Bypass OUT + R1 A 4.7F
Vi
+
IN 1F
VREV
R2 INH GND
Vi
1 VINH 2
UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UTC
UNISONIC TECHNOLOGIES CO., LTD.
11
QW-R102-021,B

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