LT1962 Series 300mA, Low Noise, Micropower LDO Regulators Features Description Low Noise: 20VRMS (10Hz to 100kHz) nn Output Current: 300mA nn Low Quiescent Current: 30A nn Wide Input Voltage Range: 1.8V to 20V nn Low Dropout Voltage: 270mV nn Very Low Shutdown Current: < 1A nn No Protection Diodes Needed nn Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3V, 3.3V, 5V nn Adjustable Output from 1.22V to 20V nn Stable with 3.3F Output Capacitor nn Stable with Aluminum, Tantalum or Ceramic Capacitors nn Reverse Battery Protection nn No Reverse Current nn Overcurrent and Overtemperature Protected nn 8-Lead MSOP Package The LT(R)1962 series are micropower, low noise, low dropout regulators. The devices are capable of supplying 300mA of output current with a dropout voltage of 270mV. Designed for use in battery-powered systems, the low 30A quiescent current makes them an ideal choice. Quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. nn Applications Cellular Phones Battery-Powered Systems nn Noise-Sensitive Instrumentation Systems nn nn A key feature of the LT1962 regulators is low output noise. With the addition of an external 0.01F bypass capacitor, output noise drops to 20VRMS over a 10Hz to 100kHz bandwidth. The LT1962 regulators are stable with output capacitors as low as 3.3F. 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 parts come in fixed output voltages of 1.5V, 1.8V, 2.5V, 3V, 3.3V and 5V, and as an adjustable device with a 1.22V reference voltage. The LT1962 regulators are available in the 8-lead MSOP package. L, LT, LTC, LTM, 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. Typical Application Dropout Voltage 400 3.3V Low Noise Regulator IN OUT 1F + SENSE 10F LT1962-3.3 SHDN GND 0.01F BYP 1962 TA01 DROPOUT VOLTAGE (mV) VIN 3.7V TO 20V 350 3.3V AT 300mA 20VRMS NOISE 300 250 200 150 100 50 0 0 50 100 150 200 LOAD CURRENT (mA) 250 300 1962 TA02 1962fb 1962fa For more information www.linear.com/LT1962 1 LT1962 Series Absolute Maximum Ratings Pin Configuration (Note 1) IN Pin Voltage..........................................................20V OUT Pin Voltage.......................................................20V Input to Output Differential Voltage (Note 2)............20V SENSE Pin Voltage...................................................20V ADJ Pin Voltage.........................................................7V BYP Pin Voltage......................................................0.6V SHDN Pin Voltage....................................................20V Output Short-Circuit Duration........................... Indefinite Operating Junction Temperature Range (Note 3).............................................. -40C to 125C Storage Temperature Range................... -65C to 150C Lead Temperature (Soldering, 10 sec).................... 300C TOP VIEW OUT SENSE/ADJ* BYP GND 8 7 6 5 1 2 3 4 IN NC NC SHDN MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 125C/W *PIN 2: SENSE FOR LT1962-1.5/LT1962-1.8/ LT1962-2.5/LT1962-3/LT1962-3.3/ LT1962-5. ADJ FOR LT1962 Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1962EMS8#PBF LT1962IMS8#PBF LT1962EMS8-1.5#PBF LT1962EMS8-1.8#PBF LT1962EMS8-2.5#PBF LT1962EMS8-3#PBF LT1962EMS8-3.3#PBF LT1962EMS8-5#PBF LT1962EMS8#TRPBF LT1962IMS8#TRPBF LT1962EMS8-1.5#TRPBF LT1962EMS8-1.8#TRPBF LT1962EMS8-2.5#TRPBF LT1962EMS8-3#TRPBF LT1962EMS8-3.3#TRPBF LT1962EMS8-5#TRPBF LTML LTML LTSZ LTTA LTPT LTPQ LTPS LTPR 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP 8-Lead Plastic MSOP -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C -40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3) PARAMETER CONDITIONS Minimum Operating Voltage LT1962 ILOAD = 300mA (Notes 4, 12) Regulated Output Voltage (Notes 4, 5) LT1962-1.5 VIN = 2V, ILOAD = 1mA 2.5V < VIN < 20V, 1mA < ILOAD < 300mA LT1962-1.8 LT1962-2.5 LT1962-3 LT1962-3.3 LT1962-5 2 MIN TYP 1.8 2.3 V l 1.485 1.462 1.500 1.500 1.515 1.538 V V VIN = 2.3V, ILOAD = 1mA 2.8V < VIN < 20V, 1mA < ILOAD < 300mA l 1.782 1.755 1.800 1.800 1.818 1.845 V V VIN = 3V, ILOAD = 1mA 3.5V < VIN < 20V, 1mA < ILOAD < 300mA l 2.475 2.435 2.500 2.500 2.525 2.565 V V VIN = 3.5V, ILOAD = 1mA 4V < VIN < 20V, 1mA < ILOAD < 300mA l 2.970 2.925 3.000 3.000 3.030 3.075 V V VIN = 3.8V, ILOAD = 1mA 4.3V < VIN < 20V, 1mA < ILOAD < 300mA l 3.267 3.220 3.300 3.300 3.333 3.380 V V VIN = 5.5V, ILOAD = 1mA 6V < VIN < 20V, 1mA < ILOAD < 300mA l 4.950 4.875 5.000 5.000 5.050 5.125 V V l MAX UNITS 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3) PARAMETER CONDITIONS ADJ Pin Voltage (Notes 4, 5) LT1962 Line Regulation Load Regulation VIN = 2V, ILOAD = 1mA 2.3V < VIN < 20V, 1mA < ILOAD < 300mA l LT1962-1.5 LT1962-1.8 LT1962-2.5 LT1962-3 LT1962-3.3 LT1962-5 LT1962 (Note 4) VIN = 2V to 20V, ILOAD = 1mA VIN = 2.3V to 20V, ILOAD = 1mA VIN = 3V to 20V, ILOAD = 1mA VIN = 3.5V to 20V, ILOAD = 1mA VIN = 3.8V to 20V, ILOAD = 1mA VIN = 5.5V to 20V, ILOAD = 1mA VIN = 2V to 20V, ILOAD = 1mA l l l l l l l LT1962-1.5 VIN = 2.5V, ILOAD = 1mA to 300mA VIN = 2.5V, ILOAD = 1mA to 300mA l VIN = 2.8V, ILOAD = 1mA to 300mA VIN = 2.8V, ILOAD = 1mA to 300mA l VIN = 3.5V, ILOAD = 1mA to 300mA VIN = 3.5V, ILOAD = 1mA to 300mA l VIN = 4V, ILOAD = 1mA to 300mA VIN = 4V, ILOAD = 1mA to 300mA l VIN = 4.3V, ILOAD = 1mA to 300mA VIN = 4.3V, ILOAD = 1mA to 300mA l VIN = 6V, ILOAD = 1mA to 300mA VIN = 6V, ILOAD = 1mA to 300mA l VIN = 2.3V, ILOAD = 1mA to 300mA VIN = 2.3V, ILOAD = 1mA to 300mA l LT1962-1.8 LT1962-2.5 LT1962-3 LT1962-3.3 LT1962-5 LT1962 (Note 4) ILOAD = 10mA ILOAD = 10mA l ILOAD = 50mA ILOAD = 50mA l ILOAD = 100mA ILOAD = 100mA l ILOAD = 300mA ILOAD = 300mA l GND Pin Current VIN = VOUT(NOMINAL) (Notes 6, 8) ILOAD = 0mA ILOAD = 1mA ILOAD = 50mA ILOAD = 100mA ILOAD = 300mA l l l l l Output Voltage Noise COUT = 10F, CBYP = 0.01F, ILOAD = 300mA, BW = 10Hz to 100kHz Dropout Voltage VIN = VOUT(NOMINAL) (Notes 6, 7, 12) ADJ Pin Bias Current (Notes 4, 9) Shutdown Threshold VOUT = Off to On VOUT = On to Off SHDN Pin Current (Note 10) MIN TYP MAX UNITS 1.208 1.190 1.220 1.220 1.232 1.250 V V 1 1 1 1 1 1 1 5 5 5 5 5 5 5 mV mV mV mV mV mV mV 3 8 15 mV mV 4 9 18 mV mV 5 12 25 mV mV 7 15 30 mV mV 7 17 33 mV mV 12 25 50 mV mV 2 6 12 mV mV 0.10 0.15 0.21 V V 0.15 0.20 0.28 V V 0.18 0.24 0.33 V V 0.27 0.33 0.43 V V 30 65 1.1 2 8 75 120 1.6 3 12 A A mA mA mA 20 VRMS 30 100 nA 0.8 0.65 2 V V VSHDN = 0V VSHDN = 20V 0.01 1 0.5 5 A A Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V 0.1 1 A Ripple Rejection VIN - VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 300mA Current Limit VIN = 7V, VOUT = 0V VIN = VOUT(NOMINAL) + 1V, VOUT = -0.1V l VIN = -20V, VOUT = 0V l Input Reverse Leakage Current l l 0.25 55 320 65 dB 700 mA mA 1 mA 1962fb 1962fa For more information www.linear.com/LT1962 3 LT1962 Series Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. (Note 3) PARAMETER CONDITIONS Reverse Output Current (Note 11) LT1962-1.5 LT1962-1.8 LT1962-2.5 LT1962-3 LT1962-3.3 LT1962-5 LT1962 (Note 4) MIN VOUT = 1.5V, VIN < 1.5V VOUT = 1.8V, VIN < 1.8V VOUT = 2.5V, VIN < 2.5V VOUT = 3V, VIN < 3V VOUT = 3.3V, VIN < 3.3V VOUT = 5V, VIN < 5V VOUT = 1.22V, VIN < 1.22V 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: Absolute maximum input to output differential voltage cannot be achieved with all combinations of rated IN pin and OUT pin voltages. With the IN pin at 20V, the OUT pin may not be pulled below 0V. The total measured voltage from in to out can not exceed 20V. Note 3: The LT1962 is tested and specified under pulse load conditions such that TJ TA. The LT1962E is tested at TA = 25C and performance is guaranteed from 0C to 125C. Performance of the LT1962E over the full -40C to 125C operating temperature range is assured by design, characterization, and correlation with statistical process controls. The LT1962I is guaranteed over the full -40C to 125C operating junction temperature range. Note 4: The LT1962 (adjustable version) is tested and specified for these conditions with the ADJ pin connected to the OUT pin. Note 5: 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. TYP MAX 10 10 10 10 10 10 5 20 20 20 20 20 20 10 UNITS A A A A A A A Note 6: To satisfy requirements for minimum input voltage, the LT1962 (adjustable version) 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 7: 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 8: 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. This is the worst-case GND pin current. The GND pin current will decrease slightly at higher input voltages. Note 9: ADJ pin bias current flows into the ADJ pin. Note 10: SHDN pin current flows into the SHDN pin. This current is included in the specification for GND pin current. Note 11: Reverse output current is tested with the IN pin grounded and the OUT pin forced to the rated output voltage. This current flows into the OUT pin and out the GND pin. Note 12: For the LT1962, LT1962-1.5 and LT1962-1.8 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 section. For other fixed voltage versions of the LT1962, the minimum input voltage is limited by the dropout voltage. Typical Performance Characteristics Guaranteed Dropout Voltage 350 450 TJ = 125C 300 250 200 TJ = 25C 150 100 50 0 4 0 50 100 200 250 150 OUTPUT CURRENT (mA) 300 1962 G01 Dropout Voltage 400 = TEST POINTS 350 TJ 125C 400 350 DROPOUT VOTLAGE (mV) 500 GUARANTEED DROPOUT VOLTAGE (mV) DROPOUT VOLTAGE (mV) Typical Dropout Voltage 400 TJ 25C 300 250 200 150 100 250 IL = 100mA 200 IL = 50mA 150 IL = 10mA 100 50 50 0 IL = 300mA 300 0 50 150 200 250 100 OUTPUT CURRENT (mA) 300 1962 G02 0 -50 -25 IL = 1mA 0 50 75 25 TEMPERATURE (C) 100 125 1962 G03 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Typical Performance Characteristics Quiescent Current LT1962-1.5 Output Voltage 1.532 40 OUTPUT VOLTAGE (V) QUIESCENT CURRENT (A) 45 35 30 25 20 15 10 5 VIN = 6V VSHDN = VIN RL = , IL = 0 (LT1962-1.5/-1.8 /2.5/-3/-3.3/-5) RL = 250k, IL = 5A (LT1962) 0 -50 -25 50 25 0 75 TEMPERATURE (C) IL = 1mA 1.524 1.827 1.516 1.818 1.508 1.500 1.492 1.484 1.476 100 1.468 -50 125 LT1962-2.5 Output Voltage IL = 1mA 1.791 1.782 -25 50 75 0 25 TEMPERATURE (C) 1.764 -50 125 100 IL = 1mA 3.030 3.330 2.49 2.48 3.015 3.000 2.985 2.970 2.955 -25 0 50 75 25 TEMPERATURE (C) 100 IL = 1mA 5.050 1.230 ADJ PIN VOLTAGE (V) 1.235 5.025 5.000 4.975 4.950 4.925 0 50 75 25 TEMPERATURE (C) 100 125 0 50 75 25 TEMPERATURE (C) 3.285 3.270 3.240 -50 100 125 1962 G10 0 50 75 25 TEMPERATURE (C) 1.225 1.220 1.215 1.210 50 75 25 TEMPERATURE (C) 1962 G09 600 500 400 300 200 VSHDN = 0V 100 0 125 TJ = 25C RL = 700 -25 100 LT1962-1.5 Quiescent Current 800 IL = 1mA 1.200 -50 -25 1962 G08 1.205 -25 3.300 LT1962 ADJ Pin Voltage 1.240 5.075 4.900 -50 -25 1962 G07 LT1962-5 Output Voltage IL = 1mA 3.255 2.940 -50 125 1962 G06 3.315 QUIESCENT CURRENT (A) 2.46 -50 5.100 OUTPUT VOLTAGE (V) 2.52 2.50 125 100 LT1962-3.3 Output Voltage 3.360 3.345 2.51 50 75 0 25 TEMPERATURE (C) -25 1962 G05 3.045 OUTPUT VOLTAGE (V) OUTPUT VOLTAGE (V) 1.800 2.53 2.47 OUTPUT VOLTAGE (V) 1.809 LT1962-3 Output Voltage 3.060 IL = 1mA 1.773 1962 G04 2.54 LT1962-1.8 Output Voltage 1.836 OUTPUT VOLTAGE (V) 50 100 125 1962 G11 0 VSHDN = VIN 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1962 G12 1962fb 1962fa For more information www.linear.com/LT1962 5 LT1962 Series Typical Performance Characteristics TJ = 25C RL = 600 500 400 300 VSHDN = 0V 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 400 300 9 0 10 QUIESCENT CURRENT (A) QUIESCENT CURRENT (A) 400 300 0 VSHDN = 0V 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 250 0 0 1 2 RL = 1.5k IL = 1mA* 3 4 5 6 7 INPUT VOLTAGE (V) 2 8 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 1250 RL = 180 IL = 10mA* 9 10 0 0 1 2 RL = 1.8k IL = 1mA* 3 4 5 6 7 INPUT VOLTAGE (V) 8 8 9 10 1962 G15 25 20 15 10 VSHDN = 0V 0 2 4 6 8 10 12 14 16 18 20 INPUT VOLTAGE (V) 1962 G18 LT1962-2.5 GND Pin Current 750 500 3 4 5 6 7 INPUT VOLTAGE (V) VSHDN = VIN 1962 G17 RL = 36 IL = 50mA* 1000 2 30 0 10 1500 TJ = 25C VIN = VSHDN *FOR VOUT = 1.8V 250 1962 G19 6 1 1 5 VSHDN = VIN 1500 GND PIN CURRENT (A) GND PIN CURRENT (A) RL = 150 IL = 10mA* VSHDN = 0V 0 0 TJ = 25C 35 RL = 250k 300 200 VSHDN = 0V VSHDN = VIN LT1962 Quiescent Current LT1962-1.8 GND Pin Current 750 500 200 40 400 1962 G16 RL = 30 IL = 50mA* 1000 300 1962 G14 500 0 10 TJ = 25C VIN = VSHDN *FOR VOUT = 1.5V 1250 400 0 10 600 LT1962-1.5 GND Pin Current 1500 9 TJ = 25C RL = 100 VSHDN = VIN 0 8 3 4 5 6 7 INPUT VOLTAGE (V) 700 500 100 2 500 LT1962-5 Quiescent Current 600 200 1 800 TJ = 25C RL = 700 0 600 100 VSHDN = VIN 1962 G13 LT1962-3.3 Quiescent Current 800 VSHDN = 0V 100 VSHDN = VIN 0 500 QUIESCENT CURRENT (A) 100 600 200 TJ = 25C RL = 700 TJ = 25C VIN = VSHDN *FOR VOUT = 2.5V 1250 GND PIN CURRENT (A) 200 LT1962-3 Quiescent Current 800 TJ = 25C RL = 700 QUIESCENT CURRENT (A) 700 QUIESCENT CURRENT (A) LT1962-2.5 Quiescent Current 800 QUIESCENT CURRENT (A) LT1962-1.8 Quiescent Current 800 RL = 50 IL = 50mA* 1000 750 RL = 250 IL = 10mA* 500 250 9 10 1962 G20 0 0 1 2 RL = 2.5k IL = 1mA* 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1962 G21 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Typical Performance Characteristics RL = 60 IL = 50mA* 750 RL = 300 IL = 10mA* 500 RL = 3k IL = 1mA* 250 0 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) RL = 66 IL = 50mA* 1000 750 RL = 330 IL = 10mA* 500 RL = 3.3k IL = 1mA* 250 9 8 0 10 0 1 3 4 5 6 7 INPUT VOLTAGE (V) 2 8 1962 G22 750 500 250 6 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 9 8 5 3 5 0 1 2 3 RL = 25 IL = 100mA* 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 1 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 5 9 10 1962 G28 10 TJ = 25C VIN = VSHDN *FOR VOUT = 1.8V 3 RL = 18 IL = 100mA* 2 5 RL = 15 IL = 200mA* 4 3 RL = 30 IL = 100mA* 2 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1962 G27 LT1962-3.3 GND Pin Current RL = 10 IL = 300mA* 6 0 9 8 RL = 9 IL = 200mA* 4 1962 G26 1 0 RL = 6 IL = 300mA* 6 0 10 8 TJ = 25C VIN = VSHDN *FOR VOUT = 3V 7 RL = 12.5 IL = 200mA* 4 3 4 5 6 7 INPUT VOLTAGE (V) 7 LT1962-3 GND Pin Current RL = 8.33 IL = 300mA* 2 1 8 GND PIN CURRENT (mA) GND PIN CURRENT (mA) 6 1 LT1962-1.8 GND Pin Current RL = 15 IL = 100mA* 2 0 10 TJ = 25C VIN = VSHDN *FOR VOUT = 2.5V 7 0 8 RL = 7.5 IL = 200mA* 4 LT1962-2.5 GND Pin Current 8 RL = 5k IL = 1mA* 1962 G24 1 0 500 0 10 RL = 5 IL = 300mA* 1962 G25 0 9 TJ = 25C VIN = VSHDN *FOR VOUT = 3.3V 7 GND PIN CURRENT (mA) 0 RL = 1.22k IL = 1mA* RL = 122 IL = 10mA* RL = 500 IL = 10mA* 250 TJ = 25C VIN = VSHDN *FOR VOUT = 1.5V 7 GND PIN CURRENT (mA) GND PIN CURRENT (A) RL = 24.4 IL = 50mA* 1000 750 LT1962-1.5 GND Pin Current 8 TJ = 25C VIN = VSHDN *FOR VOUT = 1.22V 1250 RL = 100 IL = 50mA* 1000 1962 G23 LT1962 GND Pin Current 1500 TJ = 25C VIN = VSHDN *FOR VOUT = 5V 1250 GND PIN CURRENT (mA) 1000 LT1962-5 GND Pin Current 1500 TJ = 25C VIN = VSHDN *FOR VOUT = 3.3V 1250 GND PIN CURRENT (A) 1250 GND PIN CURRENT (A) LT1962-3.3 GND Pin Current 1500 TJ = 25C VIN = VSHDN *FOR VOUT = 3V GND PIN CURRENT (A) LT1962-3 GND Pin Current 1500 6 RL = 11 IL = 300mA* 5 RL = 16.5 IL = 200mA* 4 3 RL = 33 IL = 100mA* 2 1 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1962 G29 0 0 1 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 10 1962 G30 1962fb 1962fa For more information www.linear.com/LT1962 7 LT1962 Series Typical Performance Characteristics LT1962 GND Pin Current 8 6 RL = 16.7 IL = 300mA* 5 RL = 25 IL = 200mA* 4 3 RL = 50 IL = 100mA* 2 1 6 5 4 2 RL = 12.2 IL = 100mA* 1 1 0 2 3 4 5 6 7 INPUT VOLTAGE (V) 8 9 0 10 0 1 2 1962 G31 3 4 5 6 7 INPUT VOLTAGE (V) 0.7 0.6 0.5 0.4 0.3 0.2 0.1 100 0.7 0.6 IL = 1mA 0.5 0.4 0.3 0.2 -25 50 25 0 75 TEMPERATURE (C) 100 0.4 0.8 0.6 0.4 0.2 75 50 25 TEMPERATURE (C) 100 125 1962 G37 0 1 2 3 7 8 4 5 6 SHDN PIN VOLTAGE (V) 9 VOUT = 0V 0.9 0.8 25 20 15 10 0 -50 -25 10 Current Limit 0.7 0.6 0.5 0.4 0.3 0.2 5 0.2 0 1.0 1.0 CURRENT LIMIT (A) 0.6 1962 G33 1962 G36 35 ADJ PIN BIAS CURRENT (nA) 0.8 300 1.2 0 125 30 1.0 100 200 250 150 OUTPUT CURRENT (mA) SHDN Pin Input Current ADJ Pin Bias Current 1.2 50 0 1962 G35 VSHDN = 20V -25 2 1962 G32 IL = 300mA 0 -50 125 1.4 0 -50 3 0 10 0.8 SHDN Pin Input Current 1.6 SHDN PIN INPUT CURRENT (A) 9 0.1 50 25 0 75 TEMPERATURE (C) 4 1.4 1962 G34 8 8 0.9 0.8 -25 5 SHDN Pin Threshold (Off-to-On) IL = 1mA 0 -50 6 1 1.0 SHDN PIN THRESHOLD (V) SHDN PIN THRESHOLD (V) 0.9 RL = 6.1 IL = 200mA* 3 SHDN Pin Threshold (On-to-Off) 1.0 RL = 4.07 IL = 300mA* VIN = VOUT(NOMINAL) + 1V 7 SHDN PIN INPUT CURRENT (A) 0 TJ = 25C VIN = VSHDN *FOR VOUT = 1.22V 7 GND PIN CURRENT (mA) GND PIN CURRENT (mA) TJ = 25C 7 VIN = VSHDN *FOR VOUT = 5V GND Pin Current vs ILOAD 8 GND PIN CURRENT (mA) LT1962-5 GND Pin Current 8 0.1 50 25 75 0 TEMPERATURE (C) 100 125 1962 G38 0 0 1 4 3 2 5 INPUT VOLTAGE (V) 6 7 1962 G39 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Typical Performance Characteristics Current Limit 0.8 0.6 0.4 0.2 TJ = 25C 90 VIN = 0V CURRENT FLOWS 80 INTO OUTPUT PIN 70 VOUT = VADJ (LT1962) 50 25 75 0 TEMPERATURE (C) 50 40 100 COUT = 10F 40 30 COUT = 3.3F 20 10 1k 10k FREQUENCY (Hz) 100 70 100k 1M 1962 G43 50 40 LOAD REGULATION (mV) IL = 1mA 1.00 0.75 0.50 -25 9 10 1962 G41 CBYP = 100pF 50 25 0 75 TEMPERATURE (C) 100 125 1962 G46 LT1962-1.8 LT1962-3.3 LT1962-3 LT1962-2.5 -15 100k 1962 G42 62 60 58 56 LT1962-5 100 125 1962 G47 100 TEMPERATURE (C) 1962 G44 LT1962-1.5 50 25 75 0 TEMPERATURE (C) 64 IL = 300mA 54 VIN = VOUT(NOMINAL) + 1V + 0.5VP-P RIPPLE AT f = 120Hz 52 75 0 50 25 -50 -25 1M VIN = VOUT(NOMINAL) + 1V IL = 1mA TO 300mA -25 -50 -25 125 66 CBYP = 1000pF -5 -10 100 Ripple Rejection CBYP = 0.01F LT1962 50 25 75 0 TEMPERATURE (C) 68 20 IL = 300mA VIN = VOUT(NOMINAL) + 1V 10 + 50mVRMS RIPPLE COUT = 10F 0 10 1k 10k 100 FREQUENCY (Hz) -20 0.25 0 -50 3 4 5 6 7 8 OUTPUT VOLTAGE (V) 30 0 1.25 2 Load Regulation IL = 300mA 1.50 1 LT1962 5 VOUT = 1.22V 1.75 0 60 LT1962 Minimum Input Voltage 2.00 5 0 -50 -25 RIPPLE REJECTION (dB) 50 10 Input Ripple Rejection 80 RIPPLE REJECTION (dB) RIPPLE REJECTION (dB) 60 VIN = 0V VOUT = 1.22V (LT1962) 25 VOUT = 1.5V (LT1962-1.5) VOUT = 1.8V (LT1962-1.8) VOUT = 2.5V (LT1962-2.5) 20 V OUT = 3V (LT1962-3) VOUT = 3.3V (LT1962-3.3) = 5V (LT1962-5) V 15 OUT LT1962-1.5/-1.8/-2.5/-3/-3.3/-5 LT1962-5 1962 G40 10 MINIMUM INPUT VOLTAGE (V) LT1962-3.3 20 0 125 IL = 300mA VIN = VOUT(NOMINAL) + 1V + 50mVRMS RIPPLE CBYP = 0 70 2.25 LT1962-3 30 Input Ripple Rejection 80 2.50 LT1962-1.5 LT1962-1.8 LT1962-2.5 60 10 0 -50 -25 0 LT1962 REVERSE OUTPUT CURRENT (A) VIN = 7V VOUT = 0V Reverse Output Current 30 OUTPUT NOISE SPECTRIAL DENSITY (V/Hz) CURRENT LIMIT (A) 1.0 Reverse Output Current 100 REVERSE OUTPUT CURRENT (A) 1.2 10 125 1962 G45 Output Noise Spectral Density IL = 300mA COUT = 10F CBYP = 0 LT1962-5 LT1962-3.3 LT1962-3 1 LT1962 0.1 0.01 10 LT1962-2.5 LT1962-1.8 LT1962-1.5 100 1k 10k FREQUENCY (Hz) 100k 1962 G48 1962fb 1962fa For more information www.linear.com/LT1962 9 LT1962 Series Typical Performance Characteristics RMS Output Noise vs Bypass Capacitor 160 IL = 300mA COUT = 10F CBYP = 1000pF 1 CBYP = 100pF LT1962 CBYP = 0.01F 0.1 160 IL = 300mA COUT = 10F f = 10Hz to 100kHz 140 LT1962-5 RMS Output Noise vs Load Current (10Hz to 100kHz) 120 LT1962-5 100 80 LT1962-3 LT1962-3.3 LT1962-2.5 LT1962-1.8 LT1962-1.5 60 40 LT1962 20 10 100 1k 10k FREQUENCY (Hz) 0 100k 100 10 1k CBYP (pF) 1962 G49 VOUT 100V/DIV 1962 G52 1ms/DIV 1962 G53 -0.2 -0.4 300 200 100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (ms) 1962 G56 10 LT1962 0.1 1 10 100 LOAD CURRENT (mA) 1000 1962 G51 COUT = 10F IL = 300mA 1962 G54 1ms/DIV LT1962-5 Transient Response VIN = 6V 0.4 CIN = 10F COUT = 10F 0.2 C BYP = 0 0 0 LT1962-5 LT1962-5 10Hz to 100kHz Output Noise (CBYP = 1000pF) OUTPUT VOLTAGE DEVIATION (mV) OUTPUT VOLTAGE DEVIATION (V) 1962 G55 LOAD CURRENT (mA) 1ms/DIV 40 LT1962-5 Transient Response VOUT 100V/DIV LT1962 VOUT 100V/DIV COUT = 10F IL = 300mA LT1962-5 10Hz to 100kHz Output Noise (CBYP = 0.01F) COUT = 10F IL = 300mA 60 1962 G50 VOUT 100V/DIV 1ms/DIV 80 0 0.01 10k LT1962-5 100 LT1962-5 10Hz to 100kHz Output Noise (CBYP = 100pF) LT1962-5 10Hz to 100kHz Output Noise (CBYP = 0) COUT = 10F IL = 300mA 120 20 LOAD CURRENT (mA) 0.01 COUT = 10F CBYP = 0F CBYP = 0.01F 140 OUTPUT NOISE (VRMS) 10 OUTPUT NOISE (VRMS) OUTPUT NOISE SPECTRAL DENSITY (V/Hz) Output Noise Spectral Density VIN = 6V CIN = 10F COUT = 10F CBYP = 0.01F 0.10 0.05 0 -0.05 -0.10 300 200 100 0 0 50 100 150 200 250 300 350 400 450 500 TIME (s) 1962 G57 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Pin Functions OUT (Pin 1): Output. The output supplies power to the load. A minimum output capacitor of 3.3F is required to prevent oscillations. 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. SENSE (Pin 2): Sense. For fixed voltage versions of the LT1962 (LT1962-1.5/LT1962-1.8/LT1962-2.5/LT1962-3/ LT1962-3.3/LT1962-5), the SENSE pin is the input to the error amplifier. Optimum regulation will be obtained at the point where the SENSE pin is connected to the OUT pin of the regulator. In critical applications, small voltage drops are caused by the resistance (RP) of PC traces between the regulator and the load. These may be eliminated by connecting the SENSE pin to the output at the load as shown in Figure 1 (Kelvin Sense Connection). Note that the voltage drop across the external PC traces will add to the dropout voltage of the regulator. The SENSE pin bias current is 10A at the nominal rated output voltage. The SENSE pin can be pulled below ground (as in a dual supply system where the regulator load is returned to a negative supply) and still allow the device to start and operate. 8 IN OUT 1 RP LT1962 VIN + 5 SHDN SENSE + 2 LOAD GND 4 RP 1962 F01 Figure 1. Kelvin Sense Connection ADJ (Pin 2): Adjust. For the adjustable LT1962, this is the input to the error amplifier. This pin is internally clamped to 7V. It has a bias current of 30nA which flows into the pin. The ADJ pin voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V. BYP (Pin 3): Bypass. The BYP pin is used to bypass the reference of the LT1962 to achieve low noise performance from the regulator. The BYP pin is clamped internally to 0.6V (one VBE). A small capacitor from the 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. GND (Pin 4): Ground. SHDN (Pin 5): Shutdown. The SHDN pin is used to put the LT1962 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 opencollector 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 1A. If unused, the SHDN pin must be connected to VIN. The device will not function if the SHDN pin is not connected. NC (Pins 6, 7): No Connect. These pins are not internally connected. For improved power handling capabilities, these pins can be connected to the PC board. IN (Pin 8): 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 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 LT1962 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 flow into the regulator and no reverse voltage will appear at the load. The device will protect both itself and the load. 1962fb 1962fa For more information www.linear.com/LT1962 11 LT1962 Series Applications Information The LT1962 series are 300mA low dropout regulators with micropower quiescent current and shutdown. The devices are capable of supplying 300mA at a dropout voltage of 300mV. 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) drops to less than 1A in shutdown. In addition to the low quiescent current, the LT1962 regulators incorporate several protection features which make them ideal for use in battery-powered systems. The devices are protected against both reverse input and reverse output voltages. In battery backup applications where the output can be held up by a backup battery when the input is pulled to ground, the LT1962-X acts like it has a diode in series with its output and prevents reverse current flow. 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 adjustable version of the LT1962 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 2. The device servos the output to maintain the 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 IN VIN OUT LT1962 R2 VOUT + ADJ GND R1 1962 F02 R2 VOUT = 1.22V 1+ + (IADJ) (R2) R1 VADJ = 1.22V IADJ = 30nA at 25C OUTPUT RANGE = 1.22V to 20V Figure 2. Adjustable Operation 12 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 2. 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. The adjustable device is tested and specified with the ADJ pin tied to the 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 for an output current change of 1mA to 300mA is -2mV typical at VOUT = 1.22V. At VOUT = 12V, load regulation is: (12V/1.22V)(-2mV) = -19.7mV Bypass Capacitance and Low Noise Performance The LT1962 regulators may be used with the addition of a bypass capacitor from VOUT to the 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 300mA load step 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 settle to within 1% for a 10mA to 300mA load step in less than 10s, with total output voltage deviation of less than 2% (see LT1962-5 Transient Response in the Typical Performance Characteristics section). However, regulator start-up time is 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 LT1962 regulators are 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 3.3F with an ESR of 3 or less is recommended to prevent oscillations. 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Applications Information The LT1962-X 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 LT1962, will increase the effective output capacitor value. With larger capacitors used to bypass the reference (for low noise operation), larger values of output capacitance are needed. For 100pF of bypass capacitance, 4.7F of output capacitor is recommended. With a 1000pF bypass capacitor or larger, a 6.8F output capacitor is recommended. The shaded region of Figure 3 defines the range over which the LT1962 regulators are stable. The minimum ESR needed is defined by the amount of bypass capacitance used, while the maximum ESR is 3. 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 capacitance 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 20 3.5 STABLE REGION 2.5 ESR () CHANGE IN VALUE (%) 0 3.0 2.0 CBYP = 0 CBYP = 100pF 1.5 1.0 0.5 0 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10F CBYP = 330pF CBYP 1000pF -40 -60 Y5V -80 3 2 4 5 6 7 8 9 10 OUTPUT CAPACITANCE (F) 1 X5R -20 -100 0 1962 F03 2 4 8 6 10 12 DC BIAS VOLTAGE (V) 14 16 1962 F04 Figure 3. Stability Figure 4. Ceramic Capacitor DC Bias Characteristics 40 CHANGE IN VALUE (%) 20 LT1962-5 COUT = 10F CBYP = 0.01F ILOAD = 100mA X5R 0 -20 -40 VOUT 500V/DIV Y5V -60 -80 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10F -100 -50 -25 50 25 75 0 TEMPERATURE (C) 100 125 100ms/DIV 1962 F06 1962 F05 Figure 5. Ceramic Capacitor Temperature Characteristics Figure 6. Noise Resulting from Tapping on a Ceramic Capacitor 1962fb 1962fa For more information www.linear.com/LT1962 13 LT1962 Series Applications Information 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. 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: 1. Output current multiplied by the input/output voltage differential: (IOUT)(VIN - VOUT), and The following table lists thermal resistance for several different board sizes and copper areas. All measurements were taken in still air on 1/16" FR-4 board with one ounce copper. Table 1. Measured Thermal Resistance COPPER AREA TOPSIDE* BACKSIDE BOARD AREA THERMAL RESISTANCE (JUNCTION-TO-AMBIENT) 2500mm2 2500mm2 2500mm2 110C/W 1000mm2 2500mm2 2500mm2 115C/W 225mm2 2500mm2 2500mm2 120C/W 100mm2 2500mm2 2500mm2 130C/W 50mm2 2500mm2 2500mm2 140C/W *Device is mounted on topside. Calculating Junction Temperature Example: Given an output voltage of 3.3V, an input voltage range of 4V to 6V, an output current range of 0mA to 100mA and a maximum ambient temperature of 50C, what will the maximum junction temperature be? The power dissipated by the device will be equal to: IOUT(MAX)(VIN(MAX) - VOUT) + IGND(VIN(MAX)) 2. GND pin current multiplied by the input voltage: (IGND)(VIN). where, The GND 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. So, The LT1962 series regulators have internal thermal limiting designed to protect the device during overload conditions. 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. 14 IOUT(MAX) = 100mA VIN(MAX) = 6V IGND at (IOUT = 100mA, VIN = 6V) = 2mA P = 100mA(6V - 3.3V) + 2mA(6V) = 0.28W The thermal resistance will be in the range of 110C/W to 140C/W depending on the copper area. So the junction temperature rise above ambient will be approximately equal to: 0.28W(125C/W) = 35.3C The maximum junction temperature will then be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: TJMAX = 50C + 35.3C = 85.3C 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Applications Information The LT1962 regulators incorporate several protection features which make them 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 devices are protected against reverse input voltages, reverse output voltages and reverse voltages from output to input. 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 LT1962 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 fixed voltage versions, the output will act like a large resistor, typically 500k or higher, limiting current flow to less than 40A. For adjustable versions, 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 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. 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 OUT and ADJ pin divided by the 5mA maximum current into the ADJ pin yields a minimum top resistor value of 2.6k. 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. Current flow back into the output will follow the curve shown in Figure 7. When the IN pin of the LT1962 is forced below the OUT pin or the OUT pin is pulled above the IN pin, input current 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 SHDN pin will have no effect on the reverse output current when the output is pulled above the input. 100 REVERSE OUTPUT CURRENT (A) Protection Features TJ = 25C 90 VIN = 0V CURRENT FLOWS 80 INTO OUTPUT PIN 70 VOUT = VADJ (LT1962) LT1962-1.5 60 LT1962-1.8 50 LT1962-2.5 40 LT1962-3 30 LT1962 LT1962-3.3 20 10 0 LT1962-5 0 1 2 3 4 5 6 7 8 OUTPUT VOLTAGE (V) 9 10 1962 F07 Figure 7. Reverse Output Current In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 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 1962fb 1962fa For more information www.linear.com/LT1962 15 LT1962 Series Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8 Package 8-Lead Plastic MSOP MS8 Package (LTC DWGPlastic # 05-08-1660 8-Lead MSOPRev G) (Reference LTC DWG # 05-08-1660 Rev G) 0.889 0.127 (.035 .005) 5.10 (.201) MIN 3.20 - 3.45 (.126 - .136) 3.00 0.102 (.118 .004) (NOTE 3) 0.65 (.0256) BSC 0.42 0.038 (.0165 .0015) TYP 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 0.102 (.118 .004) (NOTE 4) 4.90 0.152 (.193 .006) DETAIL "A" 0 - 6 TYP GAUGE PLANE 0.53 0.152 (.021 .006) DETAIL "A" 1 2 3 4 1.10 (.043) MAX 0.86 (.034) REF 0.18 (.007) SEATING PLANE 0.22 - 0.38 (.009 - .015) TYP 0.65 (.0256) BSC 0.1016 0.0508 (.004 .002) MSOP (MS8) 0213 REV G NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX 16 1962fb 1962fa For more information www.linear.com/LT1962 LT1962 Series Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION B 5/15 Clarified the Order Information table. PAGE NUMBER Added I-grade option. 2 2, 4 1962fb 1962fa 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. For more information www.linear.com/LT1962 17 LT1962 Series Typical Application Adjustable Current Source R1 0.1 R5 0.1 + VIN >2.7V C1 10F Paralleling of Regulators for Higher Output Current IN R1* 1k OUT SHDN LT1004-1.2 R2 40.2k R3 2k LOAD LT1962-2.5 R6 2.2k VIN > 3.7V + IN C1 10F IN + C5 0.01F LT1962 BYP 1962 TA04 C2 10F OUT C3 0.33F 1/2 LT1490 3.3V 300mA SHDN BYP GND R2 0.1 *ADJUST R1 FOR 0mA TO 300mA CONSTANT CURRENT C4 0.01F LT1962-3.3 R7 100k R4 2.2k - + FB FB GND OUT SHDN SHDN ADJ GND C2 1F R3 2.2k R4 2.2k 3 2 R7 1.21k 8 + 1 1/2 LT1490 - R6 2k R5 10k 4 1962 TA03 C3 0.01F Related Parts PART NUMBER DESCRIPTION COMMENTS LT1120 125mA Low Dropout Regulator with 20A IQ Includes 2.5V Reference and Comparator LT1121 150mA Micropower Low Dropout Regulator 30A IQ, SOT-223 Package LT1129 700mA Micropower Low Dropout Regulator 50A Quiescent Current LT1175 500mA Negative Low Dropout Micropower Regulator 45A IQ, 0.26V Dropout Voltage, SOT-223 Package LT1521 300mA Low Dropout Micropower Regulator with Shutdown 15A IQ, Reverse Battery Protection LT1529 3A Low Dropout Regulator with 50A IQ 500mV Dropout Voltage LTC(R)1627 High Efficiency Synchronous Step-Down Switching Regulator Burst ModeTM Operation, Monolithic, 100% Duty Cycle LT1761 100mA, Low Noise, Low Dropout Micropower Regulator in SOT-23 20A Quiescent Current, 20VRMS Noise LT1762 150mA, Low Noise, LDO Micropower Regulator 25A Quiescent Current, 20VRMS Noise LT1763 500mA, Low Noise, LDO Micropower Regulator 30A Quiescent Current, 20VRMS Noise LT1764 3A, Fast Transient Response Low Dropout Regulator 340mV Dropout Voltage, 40VRMS Noise LTC1772 Constant Frequency Current Mode Step-Down DC/DC Controller Up to 94% Efficiency, SOT-23 Package, 100% Duty Cycle LT1963 1.5A, Fast Transient Response Low Dropout Regulator SO-8, SOT-223 Packages 18 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LT1962 (408) 432-1900 FAX: (408) 434-0507 www.linear.com/LT1962 1962fb 1962fa LT 0515 REV B * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2000