LT1761ES5-BYPTRPBF LINEAR_DIMENSIONS | Alldatasheet
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Technical content
DESCRIPTION
100mA, Low Noise, LDO Micropower Regulators in TSOT-23 The L T®1761 series are micropower , low noise, low dropout regulators. With an external 0.01μF bypass capacitor , output noise drops to 20μV RMS over a 10Hz to 100kHz bandwidth. Designed for use in battery-powered systems, the low 20μA quiescent current makes them an ideal choice. In shutdown, quiescent current drops to less than 0.1μA. The devices are capable of operating over an input voltage from 1.8V to 20V , and can supply 100mA of output current with a dropout voltage of 300mV . Quiescent current is well controlled, not rising in dropout as it does with many other regulators. The L T1761 regulators are stable with output capacitors as low as 1μF . Small ceramic capacitors can be used without the series resistance required by other regulators. Internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse current protection. The device is available in fi xed output 5V , and as an adjustable device with a 1.22V reference voltage. The L T1761 regulators are available in the 5-lead TSOT-23 package. 5V Low Noise Regulator
FEATURES
APPLICATIONS
n Low Noise: 20μVRMS (10Hz to 100kHz) n Low Quiescent Current: 20μA n Wide Input Voltage Range: 1.8V to 20V n Output Current: 100mA n Very Low Shutdown Current: <0.1μA n Low Dropout Voltage: 300mV at 100mA n Fixed Output Voltages: 1.2V , 1.5V , 1.8V , 2V , 2.5V , 2.8V , 3V , 3.3V , 5V n Adjustable Output from 1.22V to 20V n Stable with 1μF Output Capacitor n Stable with Aluminum, Tantalum or Ceramic Capacitors n Reverse-Battery Protected n No Reverse Current n No Protection Diodes Needed n Overcurrent and Overtemperature Protected n Available in Tiny 5-Lead TSOT-23 Package n Cellular Phones n Pagers n Battery-Powered Systems n Frequency Synthesizers n Wireless Modems 10Hz to 100kHz Output Noise IN SHDN 0.01μF 10μF
1761 TA01
5.4V TO 20V BYP GND L T1761-5 5V AT100mA 20μVRMS NOISE 1μF + VOUT 100μV/DIV 20μVRMS
1761 TA01b
L, L T , L TC, L TM, Linear Technology, the Linear logo and Burst Mode are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
(Note 1) ABSOLUTE MAXIMUM RATINGS
5 OUT
4 ADJ
TJMAX = 150°C, θJA = 250°C/W SEE APPLICATIONS INFORMATION SECTION TJMAX = 150°C, θJA = 250°C/W SEE APPLICATIONS INFORMATION SECTION
4 BYP
TJMAX = 150°C, θJA = 250°C/W SEE APPLICATIONS INFORMATION SECTION PIN CONFIGURATION Operating Junction Temperature Range LEAD FREE FINISH TAPE AND REEL PART MARKING * PACKAGE DESCRIPTION TEMPERATURE RANGE L T1761ES5-BYP#PBF L T1761ES5-BYP#TRPBF L TGC 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-BYP#PBF L T1761IS5-BYP#TRPBF L TGC 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-SD#PBF L T1761ES5-SD#TRPBF L TGH 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-SD#PBF L T1761IS5-SD#TRPBF L TGH 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-1.2#PBF L T1761ES5-1.2#TRPBF L TCDS 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-1.2#PBF L T1761IS5-1.2#TRPBF L TCDS 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-1.5#PBF L T1761ES5-1.5#TRPBF L TMT 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-1.5#PBF L T1761IS5-1.5#TRPBF L TMT 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-1.8#PBF L T1761ES5-1.8#TRPBF L TJM 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-1.8#PBF L T1761IS5-1.8#TRPBF L TJM 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761MPS5-1.8#PBF L T1761MPS5-1.8#TRPBF L TDCH 5-Lead Plastic TSOT-23 –55°C to 125°C L T1761ES5-2#PBF L T1761ES5-2#TRPBF L TJE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-2#PBF L T1761IS5-2#TRPBF L TJE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-2.5#PBF L T1761ES5-2.5#TRPBF L TGD 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-2.5#PBF L T1761IS5-2.5#TRPBF L TGD 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-2.8#PBF L T1761ES5-2.8#TRPBF L TLB 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-2.8#PBF L T1761IS5-2.8#TRPBF L TLB 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-3#PBF L T1761ES5-3#TRPBF L TGE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-3#PBF L T1761IS5-3#TRPBF L TGE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-3.3#PBF L T1761ES5-3.3#TRPBF L TGF 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-3.3#PBF L T1761IS5-3.3#TRPBF L TGF 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761MPS5-3.3#PBF L T1761MPS5-3.3#TRPBF L TGF 5-Lead Plastic TSOT-23 –55°C to 125°C L T1761-BYP L T1761-SD L T1761-X ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING * PACKAGE DESCRIPTION TEMPERATURE RANGE L T1761ES5-5#PBF L T1761ES5-5#TRPBF L TGG 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-5#PBF L T1761IS5-5#TRPBF L TGG 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761MPS5-5#PBF L T1761MPS5-5#TRPBF L TGG 5-Lead Plastic TSOT-23 –55°C to 125°C LEAD BASED FINISH TAPE AND REEL PART MARKING * PACKAGE DESCRIPTION TEMPERATURE RANGE L T1761ES5-BYP L T1761ES5-BYP#TR L TGC 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-BYP L T1761IS5-BYP#TR L TGC 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-SD L T1761ES5-SD#TR L TGH 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-SD L T1761IS5-SD#TR L TGH 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-1.2 L T1761ES5-1.2#TR L TCDS 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-1.2 L T1761IS5-1.2#TR L TCDS 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-1.5 L T1761ES5-1.5#TR L TMT 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-1.5 L T1761IS5-1.5#TR L TMT 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-1.8 L T1761ES5-1.8#TR L TJM 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-1.8 L T1761IS5-1.8#TR L TJM 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761MPS5-1.8 L T1761MPS5-1.8#TR L TDCH 5-Lead Plastic TSOT-23 –55°C to 125°C L T1761ES5-2 L T1761ES5-2#TR L TJE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-2 L T1761IS5-2#TR L TJE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-2.5 L T1761ES5-2.5#TR L TGD 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-2.5 L T1761IS5-2.5#TR L TGD 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-2.8 L T1761ES5-2.8#TR L TLB 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-2.8 L T1761IS5-2.8#TR L TLB 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-3 L T1761ES5-3#TR L TGE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-3 L T1761IS5-3#TR L TGE 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761ES5-3.3 L T1761ES5-3.3#TR L TGF 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-3.3 L T1761IS5-3.3#TR L TGF 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761MPS5-3.3 L T1761MPS5-3.3#TR L TGF 5-Lead Plastic TSOT-23 –55°C to 125°C L T1761ES5-5 L T1761ES5-5#TR L TGG 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761IS5-5 L T1761IS5-5#TR L TGG 5-Lead Plastic TSOT-23 –40°C to 125°C L T1761MPS5-5 L T1761MPS5-5#TR L TGG 5-Lead Plastic TSOT-23 –55°C to 125°C Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container . For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/
ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage (Notes 3, 11) I LOAD = 100mA l 1.8 2.3 V Regulated Output Voltage (Note 4) L T1761-1.2 V IN = 2V , ILOAD = 1mA 2.3V < VIN < 20V , 1mA < ILOAD < 50mA 2.3V < VIN < 20V , 1mA < ILOAD < 100mA l l 1.185 1.170 1.150 1.2 1.2 1.2 1.215 1.230 1.240 V V V L T1761-1.5 V IN = 2V , ILOAD = 1mA 2.5V < VIN < 20V , 1mA < ILOAD < 50mA 2.5V < VIN < 20V , 1mA < ILOAD < 100mA l l 1.478 1.457 1.436 1.5 1.5 1.5 1.522 1.538 1.555 V V V L T1761-1.8 V IN = 2.3V , ILOAD = 1mA 2.8V < VIN < 20V , 1mA < ILOAD < 50mA 2.8V < VIN < 20V , 1mA < ILOAD < 100mA l l 1.775 1.750 1.725 1.8 1.8 1.8 1.825 1.845 1.860 V V V L T1761-2 V IN = 2.5V , ILOAD = 1mA 3V < VIN < 20V , 1mA < ILOAD < 50mA 3V < VIN < 20V , 1mA < ILOAD < 100mA l l 1.970 1.945 1.920 2.030 2.045 2.060 V V V L T1761-2.5 V IN = 3V , ILOAD = 1mA 3.5V < VIN < 20V , 1mA < ILOAD < 50mA 3.5V < VIN < 20V , 1mA < ILOAD < 100mA l l 2.465 2.435 2.415 2.5 2.5 2.5 2.535 2.565 2.575 V V V L T1761-2.8 V IN = 3.3V , ILOAD = 1mA 3.8V < VIN < 20V , 1mA < ILOAD < 50mA 3.8V < VIN < 20V , 1mA < ILOAD < 100mA l l 2.762 2.732 2.706 2.8 2.8 2.8 2.838 2.868 2.884 V V V L T1761-3 V IN = 3.5V , ILOAD = 1mA 4V < VIN < 20V , 1mA < ILOAD < 50mA 4V < VIN < 20V , 1mA < ILOAD < 100mA l l 2.960 2.930 2.900 3.040 3.070 3.090 V V V L T1761-3.3 V IN = 3.8V , ILOAD = 1mA 4.3V < VIN < 20V , 1mA < ILOAD < 50mA 4.3V < VIN < 20V , 1mA < ILOAD < 100mA l l 3.250 3.230 3.190 3.3 3.3 3.3 3.350 3.370 3.400 V V V L T1761-5 V IN = 5.5V , ILOAD = 1mA 6V < VIN < 20V , 1mA < ILOAD < 50mA 6V < VIN < 20V , 1mA < ILOAD < 100mA l l 4.935 4.900 4.850 5.065 5.100 5.120 V V V ADJ Pin Voltage (Note 3, 4) L T1761 V IN = 2V , ILOAD = 1mA 2.3V < VIN < 20V , 1mA < ILOAD < 50mA 2.3V < VIN < 20V , 1mA < ILOAD < 100mA l l 1.205 1.190 1.170 1.220 1.220 1.220 1.235 1.250 1.260 V V V Line Regulation L T1761-1.2 L T1761-1.5 L T1761-1.8 L T1761-2 L T1761-2.5 L T1761-2.8 L T1761-3 L T1761-3.3 L T1761-5 L T1761 (Note 3) ΔV IN = 2V to 20V , ILOAD = 1mA ΔVIN = 2V to 20V , ILOAD = 1mA ΔVIN = 2.3V to 20V , ILOAD = 1mA ΔVIN = 2.5V to 20V , ILOAD = 1mA ΔVIN = 3V to 20V , ILOAD = 1mA ΔVIN = 3.3V to 20V , ILOAD = 1mA ΔVIN = 3.5V to 20V , ILOAD = 1mA ΔVIN = 3.8V to 20V , ILOAD = 1mA ΔVIN = 5.5V to 20V , ILOAD = 1mA ΔVIN = 2V to 20V , ILOAD = 1mA l l l l l l l l l l mV mV mV mV mV mV mV mV mV mV
ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Load Regulation L T1761-1.2 VIN = 2.3V , ΔILOAD = 1mA to 50mA VIN = 2.3V , ΔILOAD = 1mA to 50mA VIN = 2.3V , ΔILOAD = 1mA to 100mA VIN = 2.3V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-1.5 V IN = 2.5V , ΔILOAD = 1mA to 50mA VIN = 2.5V , ΔILOAD = 1mA to 50mA VIN = 2.5V , ΔILOAD = 1mA to 100mA VIN = 2.5V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-1.8 V IN = 2.8V , ΔILOAD = 1mA to 50mA VIN = 2.8V , ΔILOAD = 1mA to 50mA VIN = 2.8V , ΔILOAD = 1mA to 100mA VIN = 2.8V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-2 V IN = 3V , ΔILOAD = 1mA to 50mA VIN = 3V , ΔILOAD = 1mA to 50mA VIN = 3V , ΔILOAD = 1mA to 100mA VIN = 3V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-2.5 V IN = 3.5V , ΔILOAD = 1mA to 50mA VIN = 3.5V , ΔILOAD = 1mA to 50mA VIN = 3.5V , ΔILOAD = 1mA to 100mA VIN = 3.5V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-2.8 V IN = 3.8V , ΔILOAD = 1mA to 50mA VIN = 3.8V , ΔILOAD = 1mA to 50mA VIN = 3.8V , ΔILOAD = 1mA to 100mA VIN = 3.8V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-3 V IN = 4V , ΔILOAD = 1mA to 50mA VIN = 4V , ΔILOAD = 1mA to 50mA VIN = 4V , ΔILOAD = 1mA to 100mA VIN = 4V , ΔILOAD = 1mA to 100mA l l mV mV mV mV L T1761-3.3 V IN = 4.3V , ΔILOAD = 1mA to 50mA VIN = 4.3V , ΔILOAD = 1mA to 50mA VIN = 4.3V , ΔILOAD = 1mA to 100mA VIN = 4.3V , ΔILOAD = 1mA to 100mA l l 100 mV mV mV mV L T1761-5 V IN = 6V , ΔILOAD = 1mA to 50mA VIN = 6V , ΔILOAD = 1mA to 50mA VIN = 6V , ΔILOAD = 1mA to 100mA VIN = 6V , ΔILOAD = 1mA to 100mA l l 150 mV mV mV mV L T1761 (Note 3) V IN = 2.3V , ΔILOAD = 1mA to 50mA VIN = 2.3V , ΔILOAD = 1mA to 50mA VIN = 2.3V , ΔILOAD = 1mA to 100mA VIN = 2.3V , ΔILOAD = 1mA to 100mA l l mV mV mV mV Dropout Voltage V IN = VOUT(NOMINAL) (Notes 5, 6, 11) ILOAD = 1mA ILOAD = 1mA l 0.10 0.15 0.19 V V ILOAD = 10mA ILOAD = 10mA l 0.17 0.22 0.29 V V ILOAD = 50mA ILOAD = 50mA l 0.24 0.28 0.38 V V ILOAD = 100mA ILOAD = 100mA 0.30 0.35 0.45 V V
ELECTRICAL CHARACTERISTICS The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS GND Pin Current VIN = VOUT(NOMINAL) (Notes 5, 7) ILOAD = 0mA ILOAD = 1mA ILOAD = 10mA ILOAD = 50mA ILOAD = 100mA l l l l l 230 2.2 100 400 μA μA μA mA mA Output Voltage Noise C OUT = 10μF , CBYP = 0.01μF , ILOAD = 100mA, BW = 10Hz to 100kHz 20 μV RMS ADJ Pin Bias Current (Notes 3, 8) 30 100 nA Shutdown Threshold V OUT = Off to On VOUT = On to Off l l 0.25 0.8 0.65 V SHDN Pin Current (Note 9) VSHDN = 0V VSHDN = 20V l l 0.5 μA μA Quiescent Current in Shutdown V IN = 6V , VSHDN = 0V 0.01 0.1 μA Ripple Rejection (Note 3) V IN – VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P , fRIPPLE = 120Hz, ILOAD = 50mA 55 65 dB Current Limit V IN = 7V , VOUT = 0V VIN = VOUT(NOMINAL) + 1V or 2.3V (Note 12), ΔVOUT = –5% l 110 200 mA mA Input Reverse Leakage Current V IN = –20V , VOUT = 0V l 1m A Reverse Output Current (Note 10) L T1761-1.2 L T1761-1.5 L T1761-1.8 L T1761-2 L T1761-2.5 L T1761-2.8 L T1761-3 L T1761-3.3 L T1761-5 L T1761 (Note 3) V OUT = 1.2V , VIN < 1.2V VOUT = 1.5V , VIN < 1.5V VOUT = 1.8V , VIN < 1.8V VOUT = 2V , VIN < 2V VOUT = 2.5V , VIN < 2.5V VOUT = 2.8V , VIN < 2.8V VOUT = 3V , VIN < 3V VOUT = 3.3V , VIN < 3.3V VOUT = 5V , VIN < 5V VOUT = 1.22V , VIN < 1.22V μA μA μA μA μA μA μA μA μA μA Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The L T1761 regulators are tested and specifi ed under pulse load conditions such that T J ≈ TA. The L T1761E is 100% production tested at TA = 25°C. Performance at –40°C and 125°C is assured by design, characterization and correlation with statistical process controls. The L T1761I is guaranteed over the full –40°C to 125°C operating junction temperature range. The L T1761MP is 100% tested and guaranteed over the –55°C to 125°C operating junction temperature range. Note 3: The L T1761 (adjustable versions) are tested and specifi ed for these conditions with the ADJ pin connected to the OUT pin. Note 4: Operating conditions are limited by maximum junction temperature. The regulated output voltage specifi cation 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 L T1761 (adjustable version) is tested and specifi ed 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 5μA DC load on the output. Note 6: Dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specifi ed output current. In dropout, the output voltage will be equal to: V IN – VDROPOUT . Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) or VIN = 2.3V (whichever is greater) and a current source load. This means the device is tested while operating in its dropout region or at the minimum input voltage specifi cation. This is the worst-case GND pin current. The GND pin current will decrease slightly at higher input voltages. Note 8: ADJ pin bias current fl ows into the ADJ pin. Note 9: SHDN pin current fl ows into the SHDN pin. Note 10: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current fl ows into the OUT pin and out the GND pin. Note 11: For the L T1761, L T1761-1.2, L T1761-1.5, L T1761-1.8 and L T1761-2 dropout voltage will be limited by the minimum input voltage specifi cation under some output voltage/load conditions. See the curve of Minimum Input Voltage in the Typical Performance Characteristics. Note 12: To satisfy requirements for minimum input voltage, current limit is tested at V IN = VOUT(NOMINAL) + 1V or VIN = 2.3V , whichever is greater .
TYPICAL PERFORMANCE CHARACTERISTICS Quiescent Current L T1761-1.2 Output Voltage L T1761-1.5 Output Voltage L T1761-1.8 Output Voltage L T1761-2 Output Voltage L T1761-2.5 Output Voltage Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage OUTPUT CURRENT (mA) 500 450 400 350 300 250 200 150 100 DROPOUT VOL TAGE (mV)
1761 G00
0 1 02 03 0 40 50 60 70 80 90 100 TJ = 125°C TJ = 25°C OUTPUT CURRENT (mA) 500 450 400 350 300 250 200 150 100 DROPOUT VOL TAGE (mV)
1761 G01
0 1 02 03 0 40 50 60 70 80 90 100 TJ ≤ 125°C TJ ≤ 25°C = TEST POINTS TEMPERATURE (°C) –50 DROPOUT VOLTAGE (mV) 0 50 75 1761 G01.1 –25 25 100 125 IL = 100mA IL = 50mA IL = 10mA IL = 1mA 500 450 400 350 300 250 200 150 100 TEMPERATURE (°C) –50 QUIESCENT CURRENT (μA) 100
1761 G03
–25 25 75 125 VIN = 6V RL = ∞ (250k FOR LT1761-BYP, -SD) IL = 0 (5μA FOR LT1761-BYP, -SD) VSHDN = VIN VSHDN = 0V TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G05
1.220 1.215 1.210 1.205 1.200 1.195 1.190 1.185 1.180 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G51
1.528 1.521 1.514 1.507 1.500 1.493 1.486 1.479 1.472 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G06
1.84 1.83 1.82 1.81 1.80 1.79 1.78 1.77 1.76 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G07
2.04 2.03 2.02 2.01 2.00 1.99 1.98 1.97 1.96 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G08
2.54 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 –25 25 75 125 IL = 1mA
TYPICAL PERFORMANCE CHARACTERISTICS L T1761-5 Output Voltage L T1761-BYP, L T1761-SD ADJ Pin Voltage L T1761-1.2 Quiescent Current L T1761-1.5 Quiescent Current L T1761-1.8 Quiescent Current L T1761-2 Quiescent Current L T1761-2.8 Output Voltage L T1761-3 Output Voltage L T1761-3.3 Output Voltage TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G52
2.84 2.83 2.82 2.81 2.80 2.79 2.78 2.77 2.76 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G09
3.060 3.045 3.030 3.015 3.000 2.985 2.970 2.955 2.940 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G11
3.360 3.345 3.330 3.315 3.300 3.285 3.270 3.255 3.240 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100
1761 G12
5.08 5.06 5.04 5.02 5.00 4.98 4.96 4.94 4.92 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 ADJ PIN VOLTAGE (V) 100
1761 G10
1.240 1.235 1.230 1.225 1.220 1.215 1.210 1.205 1.200 –25 25 75 125 IL = 1mA INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 250 225 200 175 150 125 100
1761 G10b
TJ = 25°C RL = ∞ VSHDN = 0V VSHDN = VIN INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G53
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G18
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G19
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V
TYPICAL PERFORMANCE CHARACTERISTICS L T1761-3.3 Quiescent Current L T1761-5 Quiescent Current L T1761-BYP, L T1761-SD Quiescent Current L T1761-1.2 GND Pin Current L T1761-1.5 GND Pin Current L T1761-1.8 GND Pin Current L T1761-2.5 Quiescent Current L T1761-2.8 Quiescent Current L T1761-3 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G13
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G54
TJ = 25°C RL = ∞ VSHDN = 0V VSHDN = VIN INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G14
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G15
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V INPUT VOLTAGE (V) QUIESCENT CURRENT (μA) 200 175 150 125 100
1761 G16
VSHDN = VIN TJ = 25°C RL = ∞ VSHDN = 0V INPUT VOLTAGE (V) 02 6 1 0 1 4 1 8 QUIESCENT CURRENT (μA) 4 8 12 16
1761 G17
TJ = 25°C RL = 250k IL = 5μA VSHDN = VIN VSHDN = 0V INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G17b
TJ = 25°C *FOR VOUT = 1.2V RL = 12Ω IL = 100mA* RL = 24Ω IL = 50mA* RL = 120Ω IL = 10mA* RL = 1.2k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G55
TJ = 25°C *FOR VOUT = 1.5V RL = 15Ω IL = 100mA* RL = 30Ω IL = 50mA* RL = 150Ω IL = 10mA* RL = 1.5k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G02
TJ = 25°C *FOR VOUT = 1.8V RL = 18Ω IL = 100mA* RL = 36Ω IL = 50mA* RL = 180Ω IL = 10mA* RL = 1.8k IL = 1mA*
TYPICAL PERFORMANCE CHARACTERISTICS L T1761-3 GND Pin Current L T1761-3.3 GND Pin Current L T1761-5 GND Pin Current L T1761-BYP, L T1761-SD GND Pin Current GND Pin Current vs I LOAD SHDN Pin Threshold (On to Off) L T1761-2 GND Pin Current L T1761-2.5 GND Pin Current L T1761-2.8 GND Pin Current INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G04
TJ = 25°C *FOR VOUT = 2V RL = 20Ω IL = 100mA* RL = 40Ω IL = 50mA* RL = 200Ω IL = 10mA* RL = 2k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G20
TJ = 25°C *FOR VOUT = 2.5V RL = 25Ω IL = 100mA RL = 50Ω IL = 50mA* RL = 250Ω IL = 10mA* RL = 2.5k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G56
TJ = 25°C *FOR VOUT = 2.8V RL = 28Ω IL = 100mA RL = 56Ω IL = 50mA* RL = 280Ω IL = 10mA* RL = 2.8k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G21
TJ = 25°C *FOR VOUT = 3V RL = 30Ω IL = 100mA* RL = 60Ω IL = 50mA* RL = 300Ω IL = 10mA* RL = 3k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G22
TJ = 25°C *FOR VOUT = 3.3V RL = 33Ω IL = 100mA* RL = 66Ω IL = 50mA* RL = 330Ω IL = 10mA* RL = 3.3k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G23
TJ = 25°C *FOR VOUT = 5V RL = 50Ω IL = 100mA RL = 100Ω IL = 50mA* RL = 500Ω IL = 10mA* RL = 5k IL = 1mA* INPUT VOLTAGE (V) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G24
TJ = 25°C *FOR VOUT = 1.22V RL = 12.2Ω IL = 100mA* RL = 24.4Ω IL = 50mA* RL = 122Ω IL = 10mA* RL = 1.22k IL = 1mA* OUTPUT CURRENT (mA) 2.50 2.25 2.00 1.75 1.50 1.25 1.00 0.75 0.50 0.25 GND PIN CURRENT (mA)
1761 G25
0 1 02 03 0 40 50 60 70 80 90 100 VIN = VOUT(NOMINAL) + 1V TEMPERATURE (°C) –50 SHDN PIN THRESHOLD (V) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 50 75
1761 G26
–25 25 100 125 IL = 1mA
TYPICAL PERFORMANCE CHARACTERISTICS ADJ Pin Bias Current Current Limit Current Limit Reverse Output Current Reverse Output Current Input Ripple Rejection SHDN Pin Threshold (Off to On) SHDN Pin Input Current SHDN Pin Input Current TEMPERATURE (°C) –50 SHDN PIN THRESHOLD (V) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 50 75
1761 G27
–25 25 100 125 IL = 100mA IL = 1mA SHDN PIN VOLTAGE (V) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 SHDN PIN INPUT CURRENT (μA)
1761 G28
TEMPERATURE (°C) –50 SHDN PIN INPUT CURRENT (μA) 0 50 75
1761 G29
–25 25 100 125 VSHDN = 20V1.4 1.2 1.0 0.8 0.6 0.4 0.2 0TEMPERATURE (oC) –50 ADJ PIN BIAS CURRENT (nA) 100 0 50 75
1761 G30
–25 25 100 125 INPUT VOLTAGE (V) SHORT-CIRCUIT CURRENT (mA) 2 4 5
1761 G31
VOUT = 0V TJ = 25°C TEMPERATURE (°C) –50 CURRENT LIMIT (mA) 0 50 75
1761 G32
–25 25 100 125 350 300 250 200 150 100 VIN = 7V VOUT = 0V OUTPUT VOLTAGE (V) 100 REVERSE OUTPUT CURRENT (μA)
1761 G33
TJ = 25°C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN V OUT = VADJ (LT1761-BYP, -SD) LT1761-BYP LT1761-SD LT1761-2 LT1761-3.3 LT1761-5 LT1761-1.8 LT1761-1.5 LT1761-2.5 LT1761-2.8 LT1761-3 LT1761-1.2 TEMPERATURE (°C) –50 REVERSE OUTPUT CURRENT (μA) 25.0 22.5 20.0 17.5 15.0 12.5 10.0 7.5 5.0 2.5 0 50 75
1761 G34
–25 25 100 125 VIN = 0V VOUT = 1.22V (LT1761-BYP, -SD) VOUT = 1.2V (LT1761-1.2) VOUT = 1.5V (LT1761-1.5) VOUT = 1.8V (LT1761-1.8) VOUT = 2V (LT1761-2) VOUT = 2.5V (LT1761-2.5) VOUT = 2.8V (LT1761-2.8) VOUT = 3V (LT1761-3) VOUT = 3.3V (LT1761-3.3) VOUT = 5V (LT1761-5) LT1761-BYP,-SD FREQUENCY (Hz) RIPPLE REJECTION (dB) 10 1k 10k 1M
1761 G35
IL = 100mA VIN = VOUT(NOMINAL) + 1V + 50mVRMS RIPPLE CBYP = 0 COUT = 1μF COUT = 10μF LT1761-BYP LT1761-5
TYPICAL PERFORMANCE CHARACTERISTICS Load Regulation ΔIL = 1mA to 50mA Load Regulation ΔIL = 1mA to 100mA Output Noise Spectral Density Output Noise Spectral Density RMS Output Noise vs Bypass Capacitor L T1761-5 Input Ripple Rejection Input Ripple Rejection L T1761-BYP, L T1761-SD Minimum Input Voltage FREQUENCY (Hz) RIPPLE REJECTION (dB) 10 1k 10k 1M
1761 G36
IL = 100mA VIN = VOUT(NOMINAL) + 1V + 50mVRMS RIPPLE COUT = 10μF CBYP = 0.01μF CBYP = 100pF CBYP = 1000pF TEMPERATURE (°C) –50 RIPPLE REJECTION (dB) 100
1761 G37
–25 25 75 125 VIN = VOUT (NOMINAL) + 1V + 0.5VP-P RIPPLE AT f = 120Hz I L = 50mA TEMPERATURE (°C) –50 MINIMUM INPUT VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 50 75
1761 G38
–25 25 100 125 IL = 100mA IL = 50mA TEMPERATURE (°C) –50 LOAD REGULATION (mV) 100
1761 G39
–10 –15 –20 –25 –30 –35 –40 –25 25 75 125 LT1761-BYP, -SD, -1.2 LT1761-1.8 LT1761-1.5 LT1761-2 LT1761-2.5 LT1761-2.8 LT1761-3 LT1761-3.3 LT1761-5 TEMPERATURE (°C) –50 LOAD REGULATION (mV) 100
1761 G40
–10 –20 –30 –40 –50 –60 –70 –80 –90 –100 –25 25 75 125 LT1761-3 LT1761-2 LT1761-2.5 LT1761-2.8 LT1761-5 LT1761-3.3 LT1761-BYP, -SD, -1.2 LT1761-1.8 LT1761-1.5 FREQUENCY (Hz) 10 1k 10k 100k
1761 G41
0.1 0.01 OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz) COUT = 10μF CBYP = 0 IL = 100mA LT1761-BYP, -SD, 1.2 LT1761-5 LT1761-3.3 LT1761-2.8,-3 LT1761-2.5 LT1761-1.8 LT1761-2 LT1761-1.5 FREQUENCY (Hz) 10 1k 10k 100k
1761 G42
0.1 0.01 OUTPUT NOISE SPECTRAL DENSITY (μV/√Hz) LT1761-BYP LT1761-5 CBYP = 1000pF CBYP = 0.01μF CBYP = 100pF COUT = 10μF IL = 100mA CBYP (pF) OUTPUT NOISE (μVRMS) 140 120 100 100 1k 10k
1761 G43
COUT = 10μF IL = 100mA f = 10Hz TO 100kHz LT1761-5 LT1761-3.3 LT1761-3 LT1761-2.8 LT1761-2.5 LT1761-1.5 LT1761-1.8, -2 LT1761-BYP, -1.2
TYPICAL PERFORMANCE CHARACTERISTICS RMS Output Noise vs Load Current (10Hz to 100kHz) L T1761-5 10Hz to 100kHz Output Noise C BYP = 0pF L T1761-5 10Hz to 100kHz Output Noise C BYP = 100pF LOAD CURRENT (mA) 0.01 OUTPUT NOISE (μVRMS) 160 140 120 100 0.1 1
1761 G44
COUT = 10μF LT1761-5 LT1761-5 LT1761-BYP LT1761-BYP CBYP = 0 CBYP = 0.01μF VOUT 100μV/DIV 1ms/DIVCOUT = 10μF IL = 100mA
1761 G45
100μV/DIV 1ms/DIVCOUT = 10μF IL = 100mA
1761 G46
10Hz to 100kHz Output Noise C BYP = 1000pF L T1761-5 10Hz to 100kHz Output Noise C BYP = 0.01μF VOUT 100μV/DIV 1ms/DIVCOUT = 10μF IL = 100mA 100μV/DIV 1ms/DIVCOUT = 10μF IL = 100mA
1761 G48
L T1761-5 T ransient Response CBYP = 0pF L T1761-5 T ransient Response CBYP = 0.01μF TIME (μs) 0.2 0.1 –0.1 –0.2 OUTPUT VOLTAGE DEVIATION (V) 100 LOAD CURRENT (mA)
1761 G49
VIN = 6V CIN = 10μF COUT = 10μF TIME (μs) 0.04 0.02 –0.02 –0.04 OUTPUT VOLTAGE DEVIATION (V) 100 LOAD CURRENT (mA)
1761 G50
0 40 60 10020 80 120 140 180160 200 VIN = 6V CIN = 10μF COUT = 10μF
IN (Pin 1): Input. Power is supplied to the device through the IN pin. A bypass capacitor is required on this pin if the device is more than six inches away from the main input fi lter 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 1μF to 10μF is suffi cient. The L T1761 regulators are designed to withstand reverse voltages on the IN pin with respect to ground and the OUT pin. 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 fl ow into the regulator and no reverse voltage will appear at the load. The device will protect both itself and the load. GND (Pin 2): Ground. SHDN (Pin 3, Fixed/-SD Devices): Shutdown. The SHDN pin is used to put the L T1761 regulators into a low power shutdown state. The output will be off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5V logic or open-collector logic with a pull-up resistor . The pull-up resistor is required to supply the pull-up current of the open-collector gate, normally several microamperes, and the SHDN pin current, typically 1μA. If unused, the SHDN pin must be connected to V IN. The device will not function if the SHDN pin is not connected. For the L T1761-BYP, the SHDN pin is internally connected to VIN. BYP (Pins 3/4, Fixed/-BYP Devices): Bypass. The BYP pin is used to bypass the reference of the L T1761 regula- tors to achieve low noise performance from the regulator . The BYP pin is clamped internally to ±0.6V (one V BE) from ground. A small capacitor from the output to this pin will bypass the reference to lower the output voltage noise. A maximum value of 0.01μF can be used for reducing output voltage noise to a typical 20μV RMS over a 10Hz to 100kHz bandwidth. If not used, this pin must be left unconnected. ADJ (Pin 4, Adjustable Devices Only): Adjust Pin. For the adjustable L T1761, this is the input to the error amplifi er . This pin is internally clamped to ±7V . It has a bias current of 30nA which fl ows into the pin (see curve of ADJ Pin Bias Current vs Temperature in the Typical Performance Characteristics section). The ADJ pin voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V . OUT (Pin 5): Output. The output supplies power to the load. A minimum output capacitor of 1μF is required to prevent oscillations. Larger output capacitors will be required for applications with large transient loads to limit peak volt- age transients. See the Applications Information section for more information on output capacitance and reverse output characteristics.
against both reverse input and reverse output voltages. rent, 30nA at 25°C, fl ows through R2 into the ADJ pin. Figure 1. The value of R1 should be no greater than 250k pin tied to the OUT pin for an output voltage of 1.22V . capacitor and 10μF output capacitor .
1761 F01
Figure 1. Adjustable Operation
operation), larger values of output capacitors are needed. used, while the maximum ESR is 3Ω.
1761 F02
Figure 2. Stability and temperature coeffi cients as shown in Figures 3 and 4.
1761 F03
1210 CASE SIZE, 10μF
Figure 3. Ceramic Capacitor DC Bias Characteristics Figure 4. Ceramic Capacitor Temperature Characteristics
1761 F04
induced by vibrations in the system or thermal transients. Figure 5’s trace in response to light tapping from a pencil. increased output voltage noise.
1761 F05
Figure 5. Noise Resulting from Tapping on a Ceramic Capacitor
- Output current multiplied by the input/output voltage
- GND pin current multiplied by the input voltage:
sum of the two components listed above. designed to protect the device during overload conditions. heat sources mounted nearby must also be considered. Table 1. Measured Thermal Resistance *Device is mounted on topside.
and a maximum ambient temperature of 50°C, what will the maximum junction temperature be? The power dissipated by the device will be equal to: I OUT(MAX)(VIN(MAX) – VOUT) + IGND(VIN(MAX)) where, I OUT(MAX) = 50mA V IN(MAX) = 6V I GND at (IOUT = 50mA, VIN = 6V) = 1mA So, The thermal resistance will be in the range of 125°C/W to 150°C/W depending on the copper area. So the junction temperature rise above ambient will be approximately equal to: The maximum junction temperature will then be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: T Protection Features The L T1761 regulators incorporate several protection features which make them ideal for use in battery-pow- ered circuits. In addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the devices are protected against reverse input voltages, reverse output voltages and reverse voltages from output to input. APPLICATIONS INFORMATION 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 125°C. The input of the device will withstand reverse voltages of 20V . Current fl ow into the device will be limited to less than 1mA (typically less than 100μA) 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 L T1761-X 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 . For fi xed voltage versions, the output will act like a large resistor , typically 500k or higher , limiting current fl ow to typically less than 100μA. For adjustable versions, the output will act like an open circuit; no current will fl ow 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 SHDN pin will turn off the device and stop the output from sourcing the short-circuit current. The ADJ pin of the adjustable device 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 pin 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.
1761 F06
Figure 6. Reverse Output Current yields a minimum top resistor value of 2.6k. the curve shown in Figure 6. current when the output is pulled above the input.
(Reference L TC DWG # 05-08-1635) 1.50 – 1.75 (NOTE 4)2.80 BSC 0.30 – 0.45 TYP
5 PLCS (NOTE 3)
DATUM ‘A’ 0.09 – 0.20 (NOTE 3) S5 TSOT-23 0302 REV B PIN ONE
2.90 BSC
(NOTE 4)
0.95 BSC
1.90 BSC
0.80 – 0.90
1.00 MAX
0.01 – 0.100.20 BSC 0.30 – 0.50 REF NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. JEDEC PACKAGE REFERENCE IS MO-193
3.85 MAX
0.62 MAX 0.95 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 1.4 MIN2.62 REF
1.22 REF
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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER F 5/10 Added MP-grade Added Typical Application 2, 3 (Revision history begins at Rev F)
Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2005 LT 0510 REV F • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS L T1120 125mA Low Dropout Regulator with 20μA I Q Includes 2.5V Reference and Comparator L T1121 150mA Micropower Low Dropout Regulator 30μA I Q, SOT-223 Package L T1129 700mA Micropower Low Dropout Regulator 50μA Quiescent Current L T1175 500mA Negative Low Dropout Micropower Regulator 45μA I Q, 0.26V Dropout Voltage, SOT-223 Package L T1521 300mA Low Dropout Micropower Regulator with Shutdown 15μA I Q, Reverse-Battery Protection L T1529 3A Low Dropout Regulator with 50μA I Q 500mV Dropout Voltage L T1762 Series 150mA, Low Noise, LDO Micropower Regulator 25μA Quiescent Current, 20μV RMS Noise L T1763 Series 500mA, Low Noise, LDO Micropower Regulator 30μA Quiescent Current, 20μV RMS Noise L TC1928 Doubler Charge Pump with Low Noise Linear Regulator Low Output Noise: 60μV RMS (100kHz BW) L T1962 Series 300mA, Low Noise, LDO Micropower Regulator 30μA Quiescent Current, 20μV RMS Noise L T1963 1.5A, Low Noise, Fast T ransient Response LDO 40μV RMS, SOT-223 Package L T1764 3A, Low Noise, Fast T ransient Response LDO 40μV RMS, 340mV Dropout Voltage L TC3404 High Effi ciency Synchronous Step-Down Switching Regulator Burst Mode Operation, Monolithic, 100% Duty Cycle TYPICAL APPLICATION OUT BYP IN SHDN LT1761-51μF VIN 5.4V TO 20V OFF ON CBYP 10μF
1761 TA02a
CBYP (pF) 0.1 STARTUP TIME (ms)1 100 100 1000 10000
1761 TA02b
Startup TimeNoise Bypassing Provides Soft-Start