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SI9181
New Product
Vishay Siliconix
Micropower 350-mA CMOS LDO Regulator With Error Flag/Power-On-Reset
FEATURES
Low 150-mV Dropout at 350-mA Load Guaranteed 350-mA Output Current 600-mA Peak Output Current Capability Uses Low ESR Ceramic Output Capacitor Fast Load and Line Transient Response Only 100-mV(rms) Noise With Noise Bypass Capacitor D 1-mA Maximum Shutdown Current D Built-in Short Circuit and Thermal Protection D Out-Of-Regulation Error Flag (Power Good or POR) D D D D D D D Fixed 1.5-V, 1.8-V, 2.0-V, 2.5-V, 2.8-V, 3.0-V, 3.3-V, 5.0-V, or Adjustable Output Voltage Options D Other Output Voltages Available by Special Order
APPLICATIONS
D Cellular Phones D Laptop and Palm Computers D PDA, Digital Still Cameras
DESCRIPTION
The SI9181 is a 350-mA CMOS LDO (low dropout) voltage regulator. The device features ultra low ground current and dropout voltage to prolong battery life in portable electronics. The SI9181 offers line/load transient response and ripple rejection superior to that of bipolar or BiCMOS LDO regulators. The device is designed to maintain regulation while delivering 600-mA peak current. This is useful for systems that have high surge current upon turn-on. The SI9181 is designed to drive the lower cost ceramic, as well as tantalum, output capacitors. The device is guaranteed stable from maximum load current down to 0-mA load. In addition, an external noise bypass capacitor connected to the device's CNOISE pin will lower the LDO's output noise for low noise applications.
The SI9181 also includes an out-of-regulation error flag. When the output voltage is 5% below its nominal output voltage, the error flag output goes low. If a capacitor is connected to the device's delay pin, the error flag output pin will generate a delayed power-on-reset signal.
TYPICAL APPLICATIONS CIRCUITS
1 2 3 VIN 2.2 mF GND 4
CNOISE DELAY GND VIN
SD ERROR SENSE/ADJ VOUT
8 7 6 5 2.2 mF
1 2 3 VIN 2.2 mF GND 4
CNOISE DELAY
SD ERROR
8 7 6 5
VOUT
GND SENSE/ADJ VIN VOUT
VOUT 2.2 mF
SI9181
SI9181
FIGURE 1. Fixed Output
1 2 0.1 mF 3 4 CNOISE DELAY SD ERROR 8 7 6 5
FIGURE 2. Adjustable Output
ON/OFF POR 1 MW VOUT
0.1 mF
GND SENSE/ADJ VIN VOUT
VIN 2.2 mF GND
SI9181
2.2 mF
FIGURE 3. Low Noise, Full Features Application
Document Number: 71119 S-01484--Rev. B, 03-Jul-00 www.vishay.com S FaxBack 408-970-5600
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SI9181
Vishay Siliconix
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.5 V SD Input Voltage, VSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to VIN Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . Short Circuit Protected Output Voltage, VOUT . . . . . . . . . . . . . . . . . . . . . . . . -0.3 V to VO(nom) + 0.3 V Maximum Junction Temperature, TJ(max) . . . . . . . . . . . . . . . . . . . . . . . 150_C Storage Temperature, TSTG . . . . . . . . . . . . . . . . . . . . . . . . . . . -55_C to 150_C ESD (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV Power Dissipation (Package)a 8-Pin TSSOP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 833 mW Thermal Impedance (QJA) 8-Pin TSSOPb . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120_C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 8.3 mW/_C above TA = 25_C
New Product
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
RECOMMENDED OPERATING RANGE
Input Voltage, VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 V to 6 V Output Voltage, VOUT (Adjustable Version) . . . . . . . . . . . . . . . . . . 1.5 V to 5 V SD Input Voltage, VSD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 V to VIN Operating Ambient Temperature, TA . . . . . . . . . . . . . . . . . . . . . -40_C to 85_C Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . -40_C to 125_C
CIN = 2.2 mF, COUT = 2.2 mF (ceramic, X5R or X7R type) , CNOISE = 0.1 mF (ceramic) COUT Range = 1 mF to 10 mF ("10%, x5R or x7R type) CIN w COUT
SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter Symbol
VIN = VOUT(nom) + 1 V, IOUT = 1 mA V CIN = 2.2 mF, COUT = 2.2 mF, VSD = 1.5 V
Limits
-40 to 85_C
Tempa
Minb
Typc
Maxb
Unit
Output Voltage Range Output Voltage Accuracy p g y (Fixed Versions) (Fi d V i ) Feedback Voltage (ADJ Version) Line Regulation (Except 5-V Version) Line Regulation (5-V Version) DVOUT VIN Line Regulation (ADJ Version) 100 VOUT
Adjustable Version 1 mA v IOUT v 350 mA
Full Room Full Room
1.5 -1.5 -2.5 1.191 1.179 -0.18 -0.18 -0.18 -0.18 5 85 150 1.215
5 1.5 2.5 1.239
V % VO(nom)
VADJ From VIN = VOUT(nom) + 1 V to VOUT(nom) + 2 V From VIN = 5.5 V to 6 V VOUT = 1.5 V, From VIN = 2.5 V to 3.5 V VOUT = 5 V, From VIN = 5.5 V to 6 V IOUT = 10 mA
V Full Full Full Full Full Room Room Room 1.251 0.18 0.18 0.18 0.18 20 180 400 550 170 290 250 425 525 150 1000 1500 1500 2800 Document Number: 71119 S-01484--Rev. B, 03-Jul-00 mA A mV V
VOUT(nom)
%/V
Dropout Dp (@VOUT w 2 V)
Voltaged Vl g
IOUT = 200 mA IOUT = 350 mA IOUT = 200 mA
VIN - VOUT Dropout Voltaged (@VOUT t 2 V, VIN w 2 V)
Full Room Room
IOUT = 350 mA IOUT = 0 mA IOUT = 200 mA
Full Room Room
Ground Pin Current G d Pi C
IGND
Full Room
IOUT = 350 mA
Full
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SI9181
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SPECIFICATIONS
Test Conditions Unless Otherwise Specified Parameter Symbol
VIN = VOUT(nom) + 1 V, IOUT = 1 mA V CIN = 2.2 mF, COUT = 2.2 mF, VSD = 1.5 V
Vishay Siliconix
Limits
-40 to 85_C
Tempa
Minb
Typc
Maxb
Unit
mA nA mA
Shutdown Supply Current ADJ Pin Current Peak Output Current Output Noise Voltage
IIN(off) IADJ IO(peak) eN
VSD = 0 V ADJ = 1.2 V VOUT w 0.95 x VOUT(nom), tpw = 2 ms BW = 50 Hz to 100 kHz IOUT = 150 mA A w/o CNOISE CNOISE = 0.1 mF f = 1 kHz
Room Room Room Room Room Room Room Room Room Room Room Room 600
0.1 5
1 100
200 100 60 60 40 10
mV (rms)
Ripple R j i Ri l Rejection
DVOUT/DVIN
IOUT = 150 mA A
f = 10 kHz f = 100 kHz
dB
Dynamic Line Regulation Dynamic Load Regulation VOUT Turn-On-Time
DVO(line) DVO(load) tON
VIN : VOUT(nom) + 1 V to VOUT(nom) + 2 V tR/tF = 5 ms, IOUT = 350 mA IOUT : 1 mA to 150 mA, tR/tF = 2 ms VIN = 4.3 V VOUT = 3 3 V 3.3 w/o CNOISE Cap CNOISE = 0.1 mF
mV 30 5 2 ms mS
Thermal Shutdown
Thermal Shutdown Junction Temp Thermal Hysteresis Short Circuit Current tJ(s/d) tHYST ISC VOUT = 0 V Room Room Room 165 20 800 _C mA
Shutdown Input
SD Input Voltage VIH VIL SD Input Currente Shutdown Hysteresis IIH IIL VHYST High = Regulator ON (Rising) Low = Regulator OFF (Falling) VSD = 0 V, Regulator OFF VSD = 6 V, Regulator ON Full Full Room Room Full 0.01 1.0 100 1.5 VIN 0.4 mA mV V
Error Output
Output High Leakage Output Low Voltageg Power_Good Trip Thresholdf, h (Rising) Hysteresisf Delay Pin Current Source IOFF VOL VTH VHYST IDELAY ERROR = VOUT(nom) ISINK = 2 mA Full Full Full Room Room 1.2 0.93 x VOUT 0.95 x VOUT 2% x VOUT 2.2 3.0 mA 0.01 2 0.4 0.97 x VOUT V mA
Notes a. Room = 25_C, Full = -40 to 85_C. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. Typical values for dropout voltage at VOUT w 2 V are measured at VOUT = 3.3 V, while typical values for dropout voltage at VOUT < 2 V are measured at VOUT = 1.8 V. d. Dropout voltage is defined as the input to output differential voltage at which the output voltage drops 2% below the output voltage measured with a 1-V differential, provided that VIN does not not drop below 2.0 V. e. The device's shutdown pin includes a typical 6-MW internal pull-down resistor connected to ground. f. VOUT is defined as the output voltage of the DUT at 1 mA. g. The Error Output (Low) function is guaranteed from VOUT = 2.0 V to VOUT = 5.0 V. h. The Power_Good trip threshold function is guaranteed from VOUT = 1.5 V to VOUT = 5.0 V and VIN w 2.0 V.
Document Number: 71119 S-01484--Rev. B, 03-Jul-00
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SI9181
Vishay Siliconix
TIMING WAVEFORMS
New Product
VIN
tON VNOM 0.95 VNOM VOUT
ERROR
tDELAY
FIGURE 4. Timing Diagram for Power-Up
PIN CONFIGURATION
TSSOP-8
CNOISE DELAY GND VIN 1 2 3 4 Top View 8 7 6 5 SD ERROR SENSE or ADJ VOUT
PIN DESCRIPTION
Pin Number
1 2 3 4 5 6 7 8
Name
CNOISE DELAY GND VIN VOUT SENSE or ADJ ERROR SD
Function
Noise bypass pin. For low noise applications, a 0.01-mF or larger ceramic capacitor should be connected from this pin to ground. Capacitor connected from this pin to ground will allow a delayed power-on-reset signal at the ERROR (Pin 7) output. Refer to Figure 4. Ground pin. Local ground for CNOISE and COUT. Input supply pin. Bypass this pin with a 2.2-mF ceramic or tantalum capacitor to ground. Output voltage. Connect COUT between this pin and ground. For fixed output voltage versions, this pin should be connected to VOUT (Pin 5). For adjustable output voltage version, this voltage feedback pin sets the output voltage via an external resistor divider. This open drain output is an error flag output which goes low when VOUT drops 5% below its nominal voltage. This pin also provides a power-on-reset signal if a capacitor is connected to the DELAY pin. By applying less than 0.4 V to this pin, the device will be turned off. Connect this pin to VIN if unused. Document Number: 71119 S-01484--Rev. B, 03-Jul-00
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SI9181
New Product
ORDERING INFORMATION
Part Number
SI9181DQ-15-T1 SI9181DQ-18-T1 SI9181DQ-20-T1 SI9181DQ-25-T1 SI9181DQ-28-T1 SI9181DQ-30-T1 SI9181DQ-33-T1 SI9181DQ-50-T1 SI9181DQ-AD-T1
Vishay Siliconix
Marking
115 118 120 125 128 130 133 150 1AD
Voltage
1.5 V 1.8 V 2.0 V 2.5 V 2.8 V 3.0 V 3.3 V 5.0 V Adjustable
Temperature Range
Package
-40 to 85 C 40 85_C
TSSOP-8 TSSOP 8
* Additional voltage options are available.
Eval Kit
SI9181DB
Temperature Range
-40 to 85_C
Board Type
Surface Mount
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Dropout Voltage vs. Load Current
300 VOUT = 3.3 V 3.5 3.0 RLOAD = 16.5 W 2.5 V DROP (mV) 200 V OUT (V) 2.0 1.5 1.0 50 0.5 0 0 100 200 300 ILOAD (mA) 400 500 600 0 1 2 3 VIN (V) 4 5 6
Dropout Characteristic
250
150
100
0
Dropout Voltage vs. Temperature
200 175 150 V DROP (mV) 125 100 75 50 25 0 -50 IOUT = 10 mA IOUT = 0 mA -25 0 25 50 75 100 125 150 Junction Temperature (_C) Document Number: 71119 S-01484--Rev. B, 03-Jul-00 50 VOUT = 3.3 V IOUT = 350 mA 250 IOUT = 300 mA Dropout Voltage (mV) 200 300
Dropout Voltage vs. VOUT
IOUT = 350 mA 150 IOUT = 300 mA 100
IOUT = 10 mA 0 1 1.5 2.0 2.5 3.0 VOUT www.vishay.com S FaxBack 408-970-5600 3.5 4.0 4.5 5.0
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SI9181
Vishay Siliconix
New Product
TYPICAL CHARACTERISTICS (INTERNALLY REGULATED, 25_C UNLESS NOTED)
Normalized Output Voltage vs. Load Current
0.30 0.15 0.00 -0.4 -0.15 -0.30 -0.45 -0.60 -0.75 0 50 100 150 200 250 300 350 400 Load Current (mA) -1.0 V OUT (%) -0.0 IOUT = 0 mA -0.2 IOUT = 100 mA
Normalized VOUT vs. Temperature
Output Voltage (%)
-0.6 IOUT = 200 mA -0.8 IOUT = 300 mA IOUT = 350 mA
-1.2 -40
-20
0
20
40
60
80
100
120
140
Junction Temperature (_C)
GND Current vs. Load Current
0.0 VOUT = 5 V -0.3 250 300
No Load GND Pin Current vs. Input Voltage
200 I GND ( mA) I GND ( mA) -0.6 25_C -0.9 85_C 150 25_C
100 -1.2
-40_C 50
-1.5 0 50 100 150 200 250 300 350 Load Current (mA)
0 0 1 2 3 4 5 6 7 Input Voltage (V)
Power Supply Rejection
0 CIN = 10 mF COUT = 2.2 mF ILOAD = 150 mA -20 I GND ( mA) 2000
GND Pin Current vs. Temperature and Load
VOUT = 5 V IOUT = 350 mA 1500
Gain (dB)
IOUT = 200 mA 1000
-40
-60
500 IOUT = 0 mA
-80 10
100
1000
10000
100000
1000000
0 -40
-20
0
20
40
60
80
100
120
140
Frequency (Hz)
Junction Temperature (_C)
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Document Number: 71119 S-01484--Rev. B, 03-Jul-00
SI9181
New Product
TYPICAL WAVEFORMS
Load Transient Response-1 Load Transient Response-2
Vishay Siliconix
VOUT 10 mV/div VOUT 10 mV/div ILOAD 100 mA/div ILOAD 100 mA/div
5.00 ms/div
VOUT = 3.3 V COUT = 2.2 mF ILOAD = 1 to 150 mA trise = 2 msec
5.00 ms/div
VOUT = 3.3 V COUT = 2.2 mF ILOAD = 150 to 1 mA tfall = 2 msec
Load Transient Response-3
Load Transient Response-4
VOUT 10 mV/div VOUT 10 mV/div ILOAD 100 mA/div ILOAD 100 mA/div
5.00 ms/div
VOUT = 3.3 V COUT = 1.0 mF ILOAD = 1 to 150 mA trise = 2 msec
5.00 ms/div
VOUT = 3.3 V COUT = 1.0 mF ILOAD = 150 to 1 mA tfall = 2 msec
LineTransient Response-1
VOUT 1 V/div VIN 2 V/div
LineTransient Respons-2
VOUT 10 mV/div
VOUT 10 mV/div
5.00 ms/div
VINSTEP = 4.3 to 5.3 V VOUT = 3.3 V COUT = 2.2 mF CIN = 10 mF ILOAD = 350 mA trise = 5 msec
5.00 ms/div
VINSTEP = 5.3 to 4.3 V VOUT = 3.3 V COUT = 2.2 mF CIN = 10 mF ILOAD = 350 mA tfall = 5 msec
Document Number: 71119 S-01484--Rev. B, 03-Jul-00
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SI9181
Vishay Siliconix
TYPICAL WAVEFORMS
Turn-On Sequence Turn-Off Sequence
New Product
VIN CH-3 2 V/div VIN 2 V/div VOUT 2 V/div VOUT CH-1 2 V/div
Cdelay 2 V/div ERROR 2 V/div
Cdelay CH-4 2 V/div ERROR CH-2 2 V/div VIN = 4.2 V VOUT = 3.3 V Cdelay = 0.1 mF CNOISE = 0.1 mF ILOAD = 350 mA 5.00 ms/div VIN = 4.2 V VOUT = 3.3 V Cdelay = 0.1 mF CNOISE = 0.1 mF ILOAD = 350 mA
10.00 ms/div
Output Noise
10.0
Noise Spectrum
mV 500 mV/div
Hz
0.01 1 ms/div VIN = 4.2 V VOUT = 3.3 V IOUT = 150 mA CNOISE = 0.1 mF BW = 10 Hz to 1 MHz 100 Hz VIN = 4.1 V VOUT = 3.3 V/10 mA CNOISE = 0.1 mF 1 MHz
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Document Number: 71119 S-01484--Rev. B, 03-Jul-00
SI9181
New Product
Vishay Siliconix
BLOCK DIAGRAMS
Switches shown for device in normal operating mode (SD = HIGH)
6 VIN CIN 2.2 mF 4
SENSE
1
CNOISE
8 SD ON RFB2 OFF 6 MW RFB1 + + - + - 60 mV 2 mA 2 CDELAY 0.1 mF ERROR + 3 GND 1.215 V VREF - - + 7 To VIN 5 COUT 2.2 mF REXT VOUT
FIGURE 5. 350-mA CMOS LDO Regulator (Fixed Output)
6 VIN CIN 2.2 mF 4
ADJ
1
CNOISE
R2 VADJ 8
SD ON OFF 6 MW 60 mV + + - + - 2 mA 2 CDELAY 0.1 mF ERROR + 3 GND 1.215 V VREF - - + 7 To VIN 5 COUT 2.2 mF REXT VOUT R1
FIGURE 6. 350-mA CMOS LDO Regulator (Adjustable Output)
Document Number: 71119 S-01484--Rev. B, 03-Jul-00
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SI9181
Vishay Siliconix
DETAILED DESCRIPTION
The SI9181 is a low drop out, low quiescent current, and very linear regulator family with very fast transient response. It is primarily designed for battery powered applications where battery run time is at a premium. The low quiescent current allows extended standby time while low drop out voltage enables the system to fully utilize battery power before recharge. The SI9181 is a very fast regulator with bandwidth exceeding 50 kHz while maintaining low quiescent current at light load conditions. With this bandwidth, the SI9181 is the fastest LDO available today. The SI9181 is stable with any output capacitor type from 1 mF to 10.0 mF. However, X5R or X7R ceramic capacitors are recommended for best output noise and transient performance. VIN VIN is the input supply pin. The bypass capacitor for this pin is not critical as long as the input supply has low enough source impedance. For practical circuits, a 1.0-mF or larger ceramic capacitor is recommended. When the source impedance is not low enough and/or the source is several inches from the SI9181, then a larger input bypass capacitor is needed. It is required that the equivalent impedance (source impedance, wire, and trace impedance in parallel with input bypass capacitor impedance) must be smaller than the input impedance of the SI9181 for stable operation. When the source impedance, wire, and trace impedance are unknown, it is recommended that an input bypass capacitor be used of a value that is equal to or greater than the output capacitor. VOUT VOUT is the output voltage of the regulator. Connect a bypass capacitor from VOUT to ground. The output capacitor can be any value from 1.0 mF to 10.0 mF. A ceramic capacitor with X5R or X7R dielectric type is recommended for best output noise, line transient, and load transient performance. GND Ground is the common ground connection for VIN and VOUT. It is also the local ground connection for CNOISE, DELAY, SENSE or ADJ, and SD. SENSE or ADJ SENSE is used to sense the output voltage. Connect SENSE to VOUT for the fixed voltage version. For the adjustable output version, use a resistor divider R1 and R2, connect R1 from VOUT to ADJ and R2 from ADJ to ground. R2 should be in the 25-kW to 150-kW range for low power consumption, while maintaining adequate noise immunity.
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The formula below calculates the value of R1, given the desired output voltage and the R2 value,
VOUT * V ADJ R2 V ADJ (1)
R1 +
VADJ is nominally 1.215 V.
SHUTDOWN (SD) SD controls the turning on and off of the SI9181. VOUT is guaranteed to be on when the SD pin voltage equals or is greater than 1.5 V. VOUT is guaranteed to be off when theSD pin voltage equals or is less than 0.4 V. During shutdown mode, the SI9181 will draw less than 2-mA current from the source. To automatically turn on VOUT whenever the input is applied, tie the SD pin to VIN. ERROR ERROR is an open drain output that goes low when VOUT is less than 5% of its normal value. As with any open drain output, an external pull up resistor is needed. When a capacitor is connected from DELAY to GROUND, the error signal transition from low to high is delayed (see Delay section). This delayed error signal can be used as the power-on reset signal for the application system. (Refer to Figure 4.) The ERROR pin is disconnected if not used. DELAY A capacitor from DELAY to GROUND sets the time delay for ERROR going from low to high state. The time delay can be calculated using the following formula:
Tdelay +
V ADJ C delay Idelay
(2)
The DELAY pin should be an open circuit if not used. CNOISE For low noise application, connect a high frequency ceramic capacitor from CNOISE to ground. A 0.01-mF or a 0.1-mF X5R or X7R is recommended.
Document Number: 71119 S-01484--Rev. B, 03-Jul-00
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