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1963affFor more information www.linear .com/L T1963A Typical applicaTion

DescripTion

1.5A, Low Noise, Fast Transient Response LDO Regulators

FeaTures

applicaTions

n Optimized for Fast T ransient Response n Output Current: 1.5A n Dropout Voltage: 340mV n Low Noise: 40µVRMS (10Hz to 100kHz) n 1mA Quiescent Current n No Protection Diodes Needed n Controlled Quiescent Current in Dropout n Fixed Output Voltages: 1.5V, 1.8V, 2.5V, 3.3V n Adjustable Output from 1.21V to 20V n < 1µA Quiescent Current in Shutdown n Stable with 10µF Output Capacitor* n Stable with Ceramic Capacitors* n Reverse Battery Protection n No Reverse Current n Thermal Limiting n 5-Lead TO-220, DD, 3-Lead SOT-223 and 8-Lead SO Packages The LT®1963A series are low dropout regulators optimized for fast transient response. The devices are capable of supplying 1.5A of output current with a dropout voltage of 340mV. Operating quiescent current is 1mA, dropping to < 1µA in shutdown. Quiescent current is well controlled; it does not rise in dropout as it does with many other regula- tors. In addition to fast transient response, the LT1963A regulators have very low output noise which makes them ideal for sensitive RF supply applications. Output voltage range is from 1.21V to 20V. The LT1963A regulators are stable with output capacitors as low as 10µF. Internal protection circuitry includes reverse bat - tery protection , current limiting, thermal limiting and reverse current protection. The devices are available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3.3V and as an adjustable device with a 1.21V reference voltage. The LT1963A regulators are available in 5-lead TO-220, DD, 3-lead SOT-223, 8-lead SO and 16-lead TSSOP packages. 3.3V to 2.5V Regulator n 3.3V to 2.5V Logic Power Supplies n Post Regulator for Switching Supplies IN SHDN 10µF* *TANTALUM, CERAMIC OR ALUMINUM ELECTROLYTIC 1963A TA01 OUT VIN > 3V SENSE GND LT1963A-2.5 2.5V 1.5A 10µF* OUTPUT CURRENT (A) DROPOUT VOLTAGE (mV) 200 300 1.6 1963A TA02 100 400 150 250 350 Dropout Voltage L, LT, LT C, LT M, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6118263, 6144250. *See Applications Information Section.

1963aff For more information www.linear .com/L T1963A pin conFiguraTion absoluTe MaxiMuM raTings (Note 1) OUT Pin V Input to Output Differential V SENSE Pin V 20V SHDN Output Short-Cir Operating Junction T emperature Range (Note 3) L 40°C to 125°C L T1963AI 55°C to 125°C 65°C to 150°C Q PACKAGE 5-LEAD PLASTIC DD TAB IS GND FRONT VIEW SENSE/ADJ* OUT GND IN SHDN *PIN 5 = SENSE FOR L T1963A-1.5/L T1963A-1.8/ L T1963A-2.5/L T1963A-3.3 = ADJ FOR LT1963A TJMAX = 150°C, θJA = 30°C/ W T PACKAGE 5-LEAD PLASTIC TO-220 SENSE/ ADJ* OUT GND IN SHDN FRONT VIEW TAB IS GND *PIN 5 = SENSE FOR L T1963A-1.5/L T1963A-1.8/ L T1963A-2.5/L T1963A-3.3 = ADJ FOR L T1963A TJMAX = 150°C, θJA = 50°C/ W FE PACKAGE 16-LEAD PLASTIC TSSOP EXPOSED PAD (PIN 17) IS GND. MUST BE SOLDERED TO THE PCB. TOP VIEW GND NC OUT OUT OUT SENSE/ADJ* GND GND GND NC IN IN IN NC SHDN GND *PIN 6 = SENSE FOR L T1963A-1.5/L T1963A-1.8/ L T1963A-2.5/L T1963A-3.3 = ADJ FOR LT1963A TJMAX = 150°C, θJA = 38°C/ W FRONT VIEW TAB IS GND OUT GND IN ST PACKAGE 3-LEAD PLASTIC SOT-223 TJMAX = 150°C, θJA = 50°C/ W TOP VIEW IN GND GND SHDN OUT SENSE/ADJ* GND NC S8 PACKAGE 8-LEAD PLASTIC SO *PIN 2 = SENSE FOR L T1963A-1.5/L T1963A-1.8/ L T1963A-2.5/L T1963A-3.3 = ADJ FOR L T1963A TJMAX = 150°C, θJA = 70°C/ W

1963affFor more information www.linear .com/L T1963A orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AEQ#PBF LT1963AEQ#TRPBF LT1963AEQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AIQ#PBF LT1963AIQ#TRPBF LT1963AIQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AMPQ#PBF LT1963AMPQ#TRPBF LT1963AMPQ 5-Lead Plastic DD-Pak –55°C to 125°C LT1963AEQ-1.5#PBF LT1963AEQ-1.5#TRPBF LT1963AEQ-1.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-1.8#PBF LT1963AEQ-1.8#TRPBF LT1963AEQ-1.8 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-2.5#PBF LT1963AEQ-2.5#TRPBF LT1963AEQ-2.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-3.3#PBF LT1963AEQ-3.3#TRPBF LT1963AEQ-3.3 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AET#PBF LT1963AET#TRPBF LT1963AET 5-Lead Plastic TO-220 –40°C to 125°C LT1963AIT#PBF LT1963AIT#TRPBF LT1963AIT 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.5#PBF LT1963AET-1.5#TRPBF LT1963AET-1.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.8#PBF LT1963AET-1.8#TRPBF LT1963AET-1.8 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-2.5#PBF LT1963AET-2.5#TRPBF LT1963AET-2.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-3.3#PBF LT1963AET-3.3#TRPBF LT1963AET-3.3 5-Lead Plastic TO-220 –40°C to 125°C LT1963AEFE#PBF LT1963AEFE#TRPBF 1963AEFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AIFE#PBF LT1963AIFE#TRPBF 1963AIFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.5#PBF LT1963AEFE-1.5#TRPBF 1963AEFE15 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.8#PBF LT1963AEFE-1.8#TRPBF 1963AEFE18 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-2.5#PBF LT1963AEFE-2.5#TRPBF 1963AEFE25 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-3.3#PBF LT1963AEFE-3.3#TRPBF 1963AEFE33 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEST-1.5#PBF LT1963AEST-1.5#TRPBF 963A15 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-1.8#PBF LT1963AEST-1.8#TRPBF 963A18 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-2.5#PBF LT1963AEST-2.5#TRPBF 963A25 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-3.3#PBF LT1963AEST-3.3#TRPBF 963A33 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AES8#PBF LT1963AES8#TRPBF 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AIS8#PBF LT1963AIS8#TRPBF 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AMPS8#PBF LT1963AMPS8#TRPBF 963AMP 8-Lead Plastic SO –55°C to 125°C LT1963AES8-1.5#PBF LT1963AES8-1.5#TRPBF 963A15 8-Lead Plastic SO –40°C to 125°C LT1963AES8-1.8#PBF LT1963AES8-1.8#TRPBF 963A18 8-Lead Plastic SO –40°C to 125°C LT1963AES8-2.5#PBF LT1963AES8-2.5#TRPBF 963A25 8-Lead Plastic SO –40°C to 125°C LT1963AES8-3.3#PBF LT1963AES8-3.3#TRPBF 963A33 8-Lead Plastic SO –40°C to 125°C LEAD BASED FINISH T APE AND REEL PA RT MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AEQ LT1963AEQ#TR LT1963AEQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AIQ LT1963AIQ#TR LT1963AIQ 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AMPQ LT1963AMPQ#TR LT1963AMPQ 5-Lead Plastic DD-Pak –55°C to 125°C LT1963AEQ-1.5 LT1963AEQ-1.5#TR LT1963AEQ-1.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-1.8 LT1963AEQ-1.8#TR LT1963AEQ-1.8 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-2.5 LT1963AEQ-2.5#TR LT1963AEQ-2.5 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AEQ-3.3 LT1963AEQ-3.3#TR LT1963AEQ-3.3 5-Lead Plastic DD-Pak –40°C to 125°C LT1963AET LT1963AET#TR LT1963AET 5-Lead Plastic TO-220 –40°C to 125°C LT1963AIT LT1963AIT#TR LT1963AIT 5-Lead Plastic TO-220 –40°C to 125°C

1963aff For more information www.linear .com/L T1963A orDer inForMaTion LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT1963AET-1.5 LT1963AET-1.5#TR LT1963AET-1.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-1.8 LT1963AET-1.8#TR LT1963AET-1.8 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-2.5 LT1963AET-2.5#TR LT1963AET-2.5 5-Lead Plastic TO-220 –40°C to 125°C LT1963AET-3.3 LT1963AET-3.3#TR LT1963AET-3.3 5-Lead Plastic TO-220 –40°C to 125°C LT1963AEFE LT1963AEFE#TR 1963AEFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AIFE LT1963AIFE#TR 1963AIFE 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.5 LT1963AEFE-1.5#TR 1963AEFE15 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-1.8 LT1963AEFE-1.8#TR 1963AEFE18 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-2.5 LT1963AEFE-2.5#TR 1963AEFE25 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEFE-3.3 LT1963AEFE-3.3#TR 1963AEFE33 16-Lead Plastic TSSOP –40°C to 125°C LT1963AEST-1.5 LT1963AEST-1.5#TR 963A15 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-1.8 LT1963AEST-1.8#TR 963A18 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-2.5 LT1963AEST-2.5#TR 963A25 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AEST-3.3 LT1963AEST-3.3#TR 963A33 3-Lead Plastic SOT-223 –40°C to 125°C LT1963AES8 LT1963AES8#TR 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AIS8 LT1963AIS8#TR 1963A 8-Lead Plastic SO –40°C to 125°C LT1963AMPS8 LT1963AMPS8#TR 963AMP 8-Lead Plastic SO –55°C to 125°C LT1963AES8-1.5 LT1963AES8-1.5#TR 963A15 8-Lead Plastic SO –40°C to 125°C LT1963AES8-1.8 LT1963AES8-1.8#TR 963A18 8-Lead Plastic SO –40°C to 125°C LT1963AES8-2.5 LT1963AES8-2.5#TR 963A25 8-Lead Plastic SO –40°C to 125°C LT1963AES8-3.3 LT1963AES8-3.3#TR 963A33 8-Lead Plastic SO –40°C to 125°C Consult LT C Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified 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 specifications, go to: http://www.linear.com/tapeandreel/

1963affFor more information www.linear .com/L T1963A elecTrical characTerisTics The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum Input Voltage (Notes 4,12) I LOAD = 0.5A ILOAD = 1.5A l 1.9 2.1 2.5 V V Regulated Output V oltage (Note 5) LT1963A-1.5 VIN = 2.21V, ILOAD = 1mA 2.5V < VIN < 20V, 1mA < ILOAD < 1.5A l 1.477 1.447 1.500 1.500 1.523 1.545 V V LT1963A-1.8 VIN = 2.3V, ILOAD = 1mA 2.8V < VIN < 20V, 1mA < ILOAD < 1.5A l 1.773 1.737 1.800 1.800 1.827 1.854 V V LT1963A-2.5 VIN = 3V, ILOAD = 1mA 3.5V < VIN < 20V, 1mA < ILOAD < 1.5A l 2.462 2.412 2.500 2.500 2.538 2.575 V V LT1963A-3.3 VIN = 3.8V, ILOAD = 1mA 4.3V < VIN < 20V, 1mA < ILOAD < 1.5A l 3.250 3.200 3.300 3.300 3.350 3.400 V V ADJ Pin V oltage (Notes 4, 5) LT1963A VIN = 2.21V, ILOAD = 1mA 2.5V < VIN < 20V, 1mA < ILOAD < 1.5A l 1.192 1.174 1.210 1.210 1.228 1.246 V V Line Regulation LT1963A -1.5 ∆ VIN = 2.21V to 20V, ILOAD = 1mA LT1963A-1.8 ∆VIN = 2.3V to 20V, ILOAD = 1mA LT1963A-2.5 ∆VIN = 3V to 20V, ILOAD = 1mA LT1963A-3.3 ∆VIN = 3.8V to 20V, ILOAD = 1mA LT1963A (Note 4) ∆VIN = 2.21V to 20V, ILOAD = 1mA l l l l l 2.0 2.5 3.0 3.5 1.5 mV mV mV mV mV Load Regulation LT1963A-1.5 VIN = 2.5V, ∆ILOAD = 1mA to 1.5A VIN = 2.5V, ∆ILOAD = 1mA to 1.5A 2 9 mV mV LT1963A-1.8 VIN = 2.8V, ∆ILOAD = 1mA to 1.5A VIN = 2.8V, ∆ILOAD = 1mA to 1.5A 2 10 mV mV LT1963A-2.5 VIN = 3.5V, ∆ILOAD = 1mA to 1.5A VIN = 3.5V, ∆ILOAD = 1mA to 1.5A 2.5 15 mV mV LT1963A-3.3 VIN = 4.3V, ∆ILOAD = 1mA to 1.5A VIN = 4.3V, ∆ILOAD = 1mA to 1.5A 3 20 mV mV LT1963A (Note 4) VIN = 2.5V, ∆ILOAD = 1mA to 1.5A VIN = 2.5V, ∆ILOAD = 1mA to 1.5A 2 8 mV mV Dropout V oltage VIN = VOUT(NOMINAL) (Notes 6, 7, 12) ILOAD = 1mA ILOAD = 1mA 0.02 0.06 0.10 V V I LOAD = 100mA ILOAD = 100mA 0.10 0.17 0.22 V V I LOAD = 500mA ILOAD = 500mA 0.19 0.27 0.35 V V I LOAD = 1.5A ILOAD = 1.5A 0.34 0.45 0.55 V V GND Pin Current V IN = VOUT(NOMINAL) + 1V (Notes 6, 8) ILOAD = 0mA ILOAD = 1mA ILOAD = 100mA ILOAD = 500mA ILOAD = 1.5A 1.0 1.1 3.8 1.5 1.6 5.5 120 mA mA mA mA mA Output V oltage Noise COUT = 10µF, ILOAD = 1.5A, BW = 10Hz to 100kHz 40 µVRMS ADJ Pin Bias Current (Notes 4, 9) 3 10 µA Shutdown Threshold VOUT = Off to On VOUT = On to Off 0.25 0.90 0.75 2 V V SHDN Pin Current (Note 10) VSHDN = 0V VSHDN = 20V 0.01 µA µA Quiescent Current in Shutdown VIN = 6V, VSHDN = 0V 0.01 1 µA

1963aff For more information www.linear .com/L T1963A elecTrical characTerisTics The l denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 3) PARAMETER CONDITIONS MIN TYP MAX UNITS Ripple Rejection VIN – VOUT = 1.5V (Avg), VRIPPLE = 0.5VP-P, fRIPPLE = 120Hz, ILOAD = 0.75A 55 63 dB Current Limit VIN = 7V, VOUT = 0V VIN = VOUT(NOMINAL) + 1V, ∆VOUT = – 0.1V 1.6 2 A A Input Reverse Leakage Current (Note 13) Q, T, S8 Packages VIN = –20V, VOUT = 0 mA mA Reverse Output Current (Note 11) LT1963A-1.5 VOUT = 1.5V, VIN < 1.5V LT1963A-1.8 VOUT = 1.8V, VIN < 1.8V LT1963A-2.5 VOUT = 2.5V, VIN < 2.5V LT1963A-3.3 VOUT = 3.3V, VIN < 3.3V LT1963A (Note 4) VOUT = 1.21V, VIN < 1.21V 600 600 600 600 300 1200 1200 1200 1200 600 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: Absolute maximum input to output differential voltage can not 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 L T1963A regulators are tested and specified under pulse load conditions such that T J ≈ TA. The L T1963AE is 100% 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 T1963AI is guaranteed over the full –40°C to 125°C operating junction temperature range. The L T1963AMP is 100% tested and guaranteed over the –55°C to 125°C operating junction temperature range. Note 4: The L T1963A (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. Note 6: To satisfy requirements for minimum input voltage, the L T1963A (adjustable version) is tested and specified for these conditions with an external resistor divider (two 4.12k resistors) for an output voltage of 2.4V. The external resistor divider will add a 300µA 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: V IN – VDROPOUT. Note 8: GND pin current is tested with VIN = VOUT(NOMINAL) + 1V and a current source load. The GND pin current will decrease 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. 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 L T1963A, L T1963A-1.5 and L T1963A-1.8 dropout voltage will be limited by the minimum input voltage specification under some output voltage/load conditions. Note 13: For the ST package, the input reverse leakage current increases due to the additional reverse leakage current for the SHDN pin, which is tied internally to the IN pin.

1963affFor more information www.linear .com/L T1963A Typical perForMance characTerisTics OUTPUT CURRENT (A) DROPOUT VOL TAGE (mV) 500 450 400 350 300 250 200 150 100 0.4 0.8 1.0 1963A G01 TJ = 125°C TJ = 25°C OUTPUT CURRENT (A) GUARANTEED DROPOUT VOL TAGE (mV) 600 500 400 300 200 100 0 0.4 0.8 1.0 1963A G02 TJ ≤ 125°C TJ ≤ 25°C = TEST POINTS TEMPERATURE (°C) –50 DROPOUT VOLTAGE (mV) 500 450 400 350 300 250 200 150 100 0 50 75 1963A G03 –25 25 100 125 IL = 100mA IL = 1mA IL = 0.5A IL = 1.5A Typical Dropout Voltage Guaranteed Dropout Voltage Dropout Voltage TEMPERATURE (°C) –50 1.4 1.2 1.0 0.8 0.6 0.4 0.2 25 75 1963A G04 –25 0 50 100 125 QUIESCENT CURRENT (mA) LT1963A VIN = 6V RL = ∞, I L = 0 VSHDN = VIN TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100 1963A G05 0 50 1.84 1.83 1.82 1.81 1.80 1.79 1.78 1.77 1.76 –25 25 75 125 IL = 1mA Quiescent Current LT1963A-1.8 Output VoltageLT1963A-1.5 Output Voltage TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 1.53 1963A G40 1.50 1.48 –25 0 50 1.47 1.46 1.54 1.52 1.51 1.49 75 100 125 IL = 1mA TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100 1963A G07 0 50 3.38 3.36 3.34 3.32 3.30 3.28 3.26 3.24 3.22 –25 25 75 125 IL = 1mA TEMPERATURE (°C) –50 ADJ PIN VOLTAGE (V) 100 1963A G08 0 50 1.230 1.225 1.220 1.215 1.210 1.205 1.200 1.195 1.190 –25 25 75 125 IL = 1mA LT1963A-3.3 Output Voltage LT1963A ADJ Pin Voltage TEMPERATURE (°C) –50 OUTPUT VOLTAGE (V) 100 1963A G06 0 50 2.58 2.56 2.54 2.52 2.50 2.48 2.46 2.44 2.42 –25 25 75 125 IL = 1mA LT1963A-2.5 Output Voltage

1963aff For more information www.linear .com/L T1963A INPUT VOLTAGE (V) GND PIN CURRENT (mA) 1963A G13 1 2 3 10 9 8 7 6 5 TJ = 25°C VSHDN = VIN *FOR VOUT = 1.8V RL = 180, IL = 10mA* RL = 18, IL = 100mA* RL = 6, IL = 300mA* INPUT VOLTAGE (V) GND PIN CURRENT (mA) 1963A G14 1 2 3 10 9 8 7 6 5 RL = 250, IL = 10mA* RL = 25, IL = 100mA* RL = 8.33, IL = 300mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 2.5V LT1963A-1.8 GND Pin Current LT1963A-2.5 GND Pin Current INPUT VOLTAGE (V) GND PIN CURRENT (mA) 1963A G15 1 2 3 10 9 8 7 6 5 RL = 330, IL = 100mA* RL = 33, IL = 100mA* RL = 11, IL = 300mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 3.3V LT1963A-3.3 GND Pin Current INPUT VOLTAGE (V) QUIESCENT CURRENT (mA) 1963A G09 2 5 6 7 8 9 101 3 4 TJ = 25°C RL = ∞ VSHDN = VIN INPUT VOLTAGE (V) QUIESCENT CURRENT (mA) 1963A G10 2 105 6 7 8 91 3 4 TJ = 25°C RL = ∞ VSHDN = VIN LT1963A-1.8 Quiescent Current LT1963A-2.5 Quiescent CurrentLT1963A-1.5 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (mA) 1 5 7 1963A G41 4 9 102 3 6 8 TJ = 25°C RL = ∞ VSHDN = VIN INPUT VOLTAGE (V) QUIESCENT CURRENT (mA) 1963A G11 2 105 6 7 8 91 3 4 TJ = 25°C RL = ∞ VSHDN = VIN LT1963A-3.3 Quiescent Current INPUT VOLTAGE (V) QUIESCENT CURRENT (mA) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 1963A G12 4 2010 12 14 16 182 6 8 TJ = 25°C RL = 4.3k VSHDN = VIN LT1963A Quiescent Current LT1963A-1.5 GND Pin Current INPUT VOLTAGE (V) GND PIN CURRENT (mA) 1963A G42 1 2 3 4 5 6 7 9 10 TJ = 25°C VSHDN = VIN *FOR VOUT = 1.5V RL = 5, IL = 300mA* RL = 15, IL = 100mA* RL = 150, IL = 10mA* Typical perForMance characTerisTics

1963affFor more information www.linear .com/L T1963A Typical perForMance characTerisTics INPUT VOLTAGE (V) GND PIN CURRENT (mA) 1963A G16 1 2 3 10 9 8 7 6 5 RL = 121, IL = 10mA* RL = 12.1, IL = 100mA* RL = 4.33, IL = 300mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 1.21V LT1963A GND Pin Current INPUT VOLTAGE (V) 100 GND PIN CURRENT (mA) 1963A G17 0 1 2 3 4 5 6 7 8 9 10 RL = 1.8, IL = 1A* RL = 1.2, IL = 1.5A* RL = 3.6, IL = 500mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 1.8V LT1963A-1.8 GND Pin CurrentLT1963A-1.5 GND Pin Current INPUT VOLTAGE (V) GND PIN CURRENT (mA) 100 1963A G43 2 1 4 3 6 7 95 10 TJ = 25°C VSHDN = VIN *FOR VOUT = 1.5V RL = 1, IL = 1.5A* RL = 1.5, IL = 1A* RL = 3, IL = 500mA* INPUT VOLTAGE (V) 100 GND PIN CURRENT (mA) 1963A G18 0 1 2 3 4 5 6 7 8 9 10 RL = 2.5, IL = 1A* RL = 5, IL = 500mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 2.5V INPUT VOLTAGE (V) 100 GND PIN CURRENT (mA) 1963A G19 0 1 2 3 4 5 6 7 8 9 10 RL = 3.3, IL = 1A* RL = 2.2, IL = 1.5A* RL = 6.6, IL = 500mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 3.3V INPUT VOLTAGE (V) 100 GND PIN CURRENT (mA) 1963A G20 0 1 2 3 4 5 6 7 8 9 10 RL = 1.21, IL = 1A* RL = 2.42, IL = 500mA* TJ = 25°C VSHDN = VIN *FOR VOUT = 1.21V LT1963A-2.5 GND Pin Current LT1963A-3.3 GND Pin Current LT1963A GND Pin Current OUTPUT CURRENT (A) 100 GND PIN CURRENT (mA) 1963A G21 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 1963A G23 –25 25 100 125 IL = 1mA IL = 1.5A 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 1963A G22 –25 25 100 125 IL = 1mA GND Pin Current vs ILOAD SHDN Pin Threshold (On-to-Off) SHDN Pin Threshold (Off-to-On)

1963aff For more information www.linear .com/L T1963A Typical perForMance characTerisTics TEMPERATURE (°C) –50 25 75 1963A G25 –25 0 50 100 125 SHDN PIN INPUT CURRENT (µA) VSHDN = 20V TEMPERATURE (°C) –50 ADJ PIN BIAS CURRENT (µA) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 50 75 1963A G26 –25 25 100 125 ADJ Pin Bias Current SHDN PIN VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 SHDN PIN INPUT CURRENT (µA) 1963A G24 0 2 4 6 8 10 12 14 16 18 20 INPUT/OUTPUT DIFFERENTIAL (V) 0 2 6 10 14 18 CURRENT LIMIT (A) 3.0 2.5 2.0 1.5 1.0 0.5 4 8 12 16 1963A G27 TJ = 125°C TJ = 25°C TJ = –50°C ΔVOUT = 100mV Current Limit Current Limit TEMPERATURE (°C) –50 CURRENT LIMIT (A) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 50 75 1963A G28 –25 25 100 125 VIN = 7V VOUT = 0V OUTPUT VOLTAGE (V) 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 REVERSE OUTPUT CURRENT (mA) 1963A G29 0 1 2 3 4 5 6 7 8 9 10 LT1963A LT1963A-1.5 LT1963A-3.3 TJ = 25°C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN V OUT = VADJ (LT1963A) VOUT = VFB (LT1963A-1.5/1.8/-2.5/-3.3) LT1963A-2.5 LT1963A-1.8 TEMPERATURE (°C) –50 REVERSE OUTPUT CURRENT (mA) 0 50 75 1963A G30 –25 25 100 125 LT1963A VIN = 0V VOUT = 1.21V (LT1963A) VOUT = 1.5V (LT1963A-1.5) VOUT = 1.8V (LT1963A-1.8) VOUT = 2.5V (LT1963A-2.5) VOUT = 3.3V (LT1963A-3.3) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 Reverse Output Current Reverse Output Current SHDN Pin Input CurrentSHDN Pin Input Current

1963affFor more information www.linear .com/L T1963A Typical perForMance characTerisTics FREQUENCY (Hz) RIPPLE REJECTION (dB) 10 1k 10k 1M 1963A G31 100 100k COUT = 10µF TANTALUM COUT = 100µF TANTALUM +10 × 1µF CERAMIC IL = 0.75A VIN = VOUT(NOMINAL) +1V + 50mVRMS RIPPLE TEMPERATURE (°C) –50 25 75 1963A G32 –25 0 50 100 125 RIPPLE REJECTION (dB) IL = 0.75A VIN = VOUT(NOMINAL) +1V + 0.5VP-P RIPPLE AT f = 120Hz Ripple Rejection Ripple Rejection TEMPERATURE (°C) –50 MINIMUM INPUT VOLTAGE (V) 3.0 2.5 2.0 1.5 1.0 0.5 25 75 1963A G33 –25 0 50 100 125 IL = 1.5A IL = 500mA IL = 100mA LT1963A Minimum Input Voltage TEMPERATURE (°C) –50 LOAD REGULATION (mV) –10 –15 –20 25 75 1963A G34 –25 0 50 100 125 LT1963A LT1963A-3.3 LT1963A-1.8 LT1963A-2.5 LT1963A-1.5 VIN = VOUT(NOMINAL) +1V VIN = 2.7V (LT1963A/LT1963A-1.5) ΔIL = 1mA TO 1.5A FREQUENCY (Hz) 0.01OUTPUT NOISE SPECTRAL DENSITY (µV/√Hz) 0.1 10 100 1k 10k 100k 1.0 1963A G35 COUT = 10µF IL =1.5A LT1963A-3.3 LT1963A-2.5 LT1963A-1.8 LT1963A LT1963A-1.5 Load Regulation Output Noise Spectral Density LOAD CURRENT (A) OUTPUT NOISE VOLTAGE (µVRMS) 0.0001 0.01 0.1 10 1963A G36 0.001 1 COUT = 10µF LT1963A-3.3 LT1963A-2.5 LT1963A-1.8 LT1963A-1.5 LT1963A VOUT 100µV/DIV 1ms/DIVCOUT = 10µF ILOAD = 1.5A 1963A G37 RMS Output Noise vs Load Current (10Hz to 100kHz) LT1963A-3.3 10Hz to 100kHz Output Noise

1963aff For more information www.linear .com/L T1963A Typical perForMance characTerisTics TIME (µs) 200 150 100 –50 –100 0.6 0.4 0.2 OUTPUT VOLTAGE DEVIATION (mV) 1963A G38 0 2 4 6 8 10 12 14 16 18 20 VIN = 4.3V CIN = 3.3µF TANTALUM COUT = 10µF TANTALUM LOAD CURRENT (A) TIME (µs) 150 100 –50 –100 –150 1.5 1.0 0.5 OUTPUT VOLTAGE DEVIATION (mV) LOAD CURRENT (A) 1963A G39 0 50 100 150 250 300 350 400 450 500200 VIN = 4.3V CIN = 33µF TANTALUM COUT = 100µF TANTALUM +10 × 1µF CERAMIC LT1963A-3.3 T ransient Response LT1963A-3.3 T ransient Response

3µA. If unused, the SHDN pin must be connected to VIN. OUT: Output. The output supplies power to the load. reverse output characteristics. still allow the device to start and operate. to the error amplifier. This pin is internally clamped to ±7V. output voltage range is 1.21V to 20V. Figure 1. Kelvin Sense Connection

which make them ideal for use in battery-powered systems. and still allow the device to start and operate.

1. The device servos the output to maintain the voltage at

is turned off and the divider current will be zero. pin tied to the OUT pin for an output voltage of 1.21V. is both internal and external—the output capacitor. the maximum ESR allowable is 3Ω. Figure 2. Adjustable Operation

well damped and settles to within 10mV in less than 20µs. be greater than twice the value of the ceramic capacitor. ESR specifications in the hundreds of mΩ to several Ohms. surge capability than older types and generally lower ESR. provide near optimum transient response. ESR which can easily exceed the 3Ω maximum value. Table 1. Capacitor Minimum ESR voltages with various capacitors and various values of ESR. value of ESR will provide a more optimum response. 20mΩ of ESR to provide good damping at 1.2V output. similar characteristics to the 10µF case (see Figures 7-8). At 2.5VOUT 5mΩ to 20mΩ can improve transient response. At 5VOUT the response is well damped with 0Ω ESR.

is available in higher values. induced by vibrations in the system or thermal transients. the RMS ripple current associated with the load. Figure 10. Ceramic Capacitor DC Bias Characteristics

1210 CASE SIZE, 10µF

Figure 11. Ceramic Capacitor Temperature Characteristics Table 2. PC Trace Resistors

1963aff For more information www.linear .com/L T1963A applicaTions inForMaTion typically 40nV/√Hz over this frequency bandwidth for the LT1963A ( adjustable version). For higher output voltages ( generated by using a resistor divider), the output voltage noise will be gained up accordingly. This results in RMS noise over the 10Hz to 100kHz bandwidth of 14µVRMS for the LT1963A increasing to 38µVRMS for the LT1963A-3.3. Higher values of output voltage noise may be measured when care is not exercised with regard to circuit layout and testing . Crosstalk from nearby traces can induce unwanted noise onto the output of the LT1963A-X. Power supply ripple rejection must also be considered; the LT1963A regulators do not have unlimited power supply rejection and will pass a small portion of the input noise through to the output. Thermal Considerations The power handling capability of the device is limited by the maximum rated junction temperature (125°C). The power dissipated by the device is made up of two components: 1. Output current multiplied by the input/output voltage differential: (IOUT)(VIN – VOUT), and 2. GND pin current multiplied by the input voltage: (IGND) (VIN). The GND pin current can be found using the GND Pin Current curves in the Typical Per formance Characteristics. Power dissipation will be equal to the sum of the two components listed above. The LT1963A series regulators have internal thermal limiting designed to protect the device during overload conditions. For continuous normal conditions, the maxi- mum junction temperature rating of 125°C must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambi- ent. 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 gener- ated by power devices. This resistor should be made using one of the inner layers of the PC board which are well defined. The resistiv- ity is determined primarily by the sheet resistance of the copper laminate with no additional plating steps. Table 2 gives some sizes for 0.75A RMS current for various copper thicknesses. More detailed information regarding resistors made from PC traces can be found in Application Note 69, Appendix A. Overload Recovery Like many IC power regulators, the LT1963A-X has safe op- erating area protection. The safe area protection decreases the current limit as input-to-output voltage increases and keeps the power transistor inside a safe operating region for all values of input-to-output voltage. The protection is designed to provide some output current at all values of input-to-output voltage up to the device breakdown. When power is first turned on, as the input voltage rises, the output follows the input, allowing the regulator to start up into very heavy loads. During the start-up, as the input voltage is rising, the input-to-output voltage differential is small, allowing the regulator to supply large output currents. With a high input voltage, a problem can occur wherein removal of an output short will not allow the output voltage to recover. Other regulators, such as the LT1085, also exhibit this phenomenon, so it is not unique to the LT1963A-X. The problem occurs with a heavy output load when the input voltage is high and the output voltage is low. Common situations are immediately after the removal of a short- circuit or when the shutdown pin is pulled high after the input voltage has already been turned on. The load line for such a load may intersect the output current curve at two points. If this happens, there are two stable output operat- ing points for the regulator. With this double intersection, the input power supply may need to be cycled down to zero and brought up again to make the output recover. Output Voltage Noise The LT1963A regulators have been designed to provide low output voltage noise over the 10Hz to 100kHz band- width while operating at full load. Output voltage noise is

Table 3. Q Package, 5-Lead DD Table 4. S0-8 Package, 8-Lead SO Table 5. SOT-223 Package, 3-Lead SOT-223 and reverse voltages from output to input. tion, the junction temperature should not exceed 125°C. batteries that can be plugged in backward.

1963aff For more information www.linear .com/L T1963A applicaTions inForMaTion The output of the LT1963A 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 5k or higher, limiting current flow to typically less than 600µA. 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 5k) in series with a diode when pulled above ground. In situations where the ADJ pin is connected to a resistor divider that would pull the ADJ pin above its 7V clamp volt- age if the output is pulled high, the ADJ pin input current must be limited to less than 5mA. For example, a resistor divider is used to provide a regulated 1.5V output from the 1.21V 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 pins divided by the 5mA maximum current into the ADJ pin yields a minimum top resistor value of 2.6k. Figure 12. Reverse Output Current OUTPUT VOLTAGE (V) REVERSE OUTPUT CURRENT (mA) 3.0 4.0 5.0 1963A F12 2.0 1.0 2.5 3.5 4.5 1.5 0.5 21 3 4 6 975 10 LT1963A VOUT = VADJ TJ = 25°C VIN = 0V CURRENT FLOWS INTO OUTPUT PIN LT1963A-2.5 VOUT = VFB LT1963A-3.3 V OUT = VFB LT1963A-1.8 VOUT = VFB LT1963A-1.5 VOUT = VFB 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 12. When the IN pin of the LT1963A is forced below the OUT pin or the OUT pin is pulled above the IN pin, input cur- rent will typically drop to less than 2µA. 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.

1963affFor more information www.linear .com/L T1963A Typical applicaTions 10VAC AT 115VIN 10VAC AT 115VIN 750/uni03A9 LT1018 LT1018 LT1006 10k 10k 10k 200k 0.1µF 22µF 1µF 0.033µF 1N4148 1N4148 LT1004 1.2V 750/uni03A9 C1A C1B 34k* 12.1k* 3.3VOUT 1.5A 500µH 10000µF TO ALL “+V” POINTS 22µF 1N4002 1N4002 1N4002 1N4148 “SYNC” 90-140 VAC 1963A TA03 LT1963A-3.3 IN SHDN OUT FB GND 2.4k L1 = COILTRONICS CTX500-2-52 L2 = STANCOR P-8559 * = 1% FILM RESISTOR = NTE5437 SCR Pre-Regulator Provides Efficiency Over Line Variations LT1963A-3.3 GND LT1963A IN SHDN OUT FB IN SHDN OUT FB GND R1, 0.01/uni03A9 0.01/uni03A9 2.2k 2.2k 6.65k 4.12k 100µF 0.01µF 22µFV IN > 3.7V SHDN 3.3V LT1366 1963A TA05 Paralleling of Regulators for Higher Output Current

1963aff For more information www.linear .com/L T1963A pacKage DescripTion Q(DD5) 0811 REV F .028 – .038 (0.711 – 0.965) TYP .143 +.012 –.020 ( )3.632 +0.305 –0.508 .067 (1.702) BSC .013 – .023 (0.330 – 0.584) .095 – .115 (2.413 – 2.921) .004 +.008 –.004 ( )0.102 +0.203 –0.102 .050 ±.012 (1.270 ±0.305) .059 (1.499) TYP .045 – .055 (1.143 – 1.397) .165 – .180 (4.191 – 4.572) .330 – .370 (8.382 – 9.398) .060 (1.524) TYP .390 – .415 (9.906 – 10.541) 15° TYP .420 .350 .585 .090 .042.067 RECOMMENDED SOLDER PAD LAYOUT .325 .205 .080 .585 .090 RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS .042.067 .420 .276 .320 NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE .300 (7.620) .075 (1.905) .183 (4.648) .060 (1.524) .060 (1.524) .256 (6.502) BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK Q Package 5-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1461 Rev F) DETAIL A DETAIL A 0° – 7° TYP0° – 7° TYP

1963affFor more information www.linear .com/L T1963A pacKage DescripTion 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference L TC DWG # 05-08-1610) .016 – .050 (0.406 – 1.270) .010 – .020 0°– 8° TYP .008 – .010 (0.203 – 0.254) SO8 0303 .053 – .069 (1.346 – 1.752) .014 – .019 (0.355 – 0.483) TYP .004 – .010 (0.101 – 0.254) .050 (1.270) BSC 1 2 3 4 .150 – .157 (3.810 – 3.988) NOTE 3 8 7 6 5 .189 – .197 (4.801 – 5.004) NOTE 3 .228 – .244 (5.791 – 6.197) .245 MIN .160 ±.005 RECOMMENDED SOLDER PAD LAYOUT .045 ±.005 .050 BSC .030 ±.005 TYP INCHES (MILLIMETERS) NOTE: 1. DIMENSIONS IN 2. DRAWING NOT TO SCALE 3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

1963aff For more information www.linear .com/L T1963A pacKage DescripTion 3-Lead Plastic SOT-223 (Reference L TC DWG # 05-08-1630) .114 – .124 (2.90 – 3.15) .248 – .264 (6.30 – 6.71) .130 – .146 (3.30 – 3.71) .264 – .287 (6.70 – 7.30) .0905 (2.30) BSC .033 – .041 (0.84 – 1.04) .181 (4.60) BSC .024 – .033 (0.60 – 0.84) .071 (1.80) MAX 10° MAX .012 (0.31) MIN .0008 – .0040 (0.0203 – 0.1016) 10° – 16° .010 – .014 (0.25 – 0.36) 10° – 16° RECOMMENDED SOLDER PAD LAYOUT ST3 (SOT-233) 0502 .129 MAX .059 MAX .059 MAX .181 MAX .039 MAX .248 BSC .090 BSC

1963affFor more information www.linear .com/L T1963A pacKage DescripTion T Package 5-Lead Plastic TO-220 (Standard) (Reference L TC DWG # 05-08-1421) T5 (TO-220) 0801 .028 – .038 (0.711 – 0.965) .067 (1.70) .135 – .165 (3.429 – 4.191) .700 – .728 (17.78 – 18.491) .045 – .055 (1.143 – 1.397) .095 – .115 (2.413 – 2.921) .013 – .023 (0.330 – 0.584) .620 (15.75) TYP .155 – .195* (3.937 – 4.953) .152 – .202 (6.60 – 8.13) .165 – .180 (4.191 – 4.572) .147 – .155 (3.734 – 3.937) DIA .390 – .415 (9.906 – 10.541) .330 – .370 (8.382 – 9.398) .460 – .500 (11.684 – 12.700) .570 – .620 (14.478 – 15.748) .230 – .270 (5.842 – 6.858) BSC SEATING PLANE * MEASURED AT THE SEATING PLANE

1963aff For more information www.linear .com/L T1963A pacKage DescripTion 16-Lead Plastic TSSOP (4.4mm) (Reference LTC DWG # 05-08-1663 Rev J) Exposed Pad Variation BB FE16 (BB) TSSOP REV J 1012 0.09 – 0.20 (.0035 – .0079) 0° – 8° 0.25 REF 0.50 – 0.75 (.020 – .030) 4.30 – 4.50* (.169 – .177) 1 3 4 5 6 7 8 10 9 4.90 – 5.10* (.193 – .201) 16 1514 13 12 11 1.10 (.0433) MAX 0.05 – 0.15 (.002 – .006) 0.65 (.0256) BSC 2.94 (.116) 0.195 – 0.30 (.0077 – .0118) TYP 2RECOMMENDED SOLDER PAD LAYOUT 0.45 ±0.050.65 BSC 4.50 ±0.10 6.60 ±0.10 1.05 ±0.10 2.94 (.116) 3.05 (.120) 3.58 (.141) 3.58 (.141) 4.70 (.185) MILLIMETERS (INCHES) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS 2. DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE 4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT SEE NOTE 4 NOTE 5 NOTE 5 6.40 (.252) BSC 5. BOTTOM EXPOSED PADDLE MAY HAVE METAL PROTRUSION IN THIS AREA. THIS REGION MUST BE FREE OF ANY EXPOSED TRACES OR VIAS ON PBC LAYOUT *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE DETAIL A DETAIL A IS THE PART OF THE LEAD FRAM FEATURE FOR REFERENCE ONLY NO MEASUREMENT PUROSE 0.56 (.022) REF 0.53 (.021) REF DETAIL A

1963affFor more information www.linear .com/L T1963A

revision hisTory

REV DATE DESCRIPTION PAGE NUMBER E 02/11 Updated FE and Q package drawings in Package Description section 22, 26 F 09/13 Replaced graphs with correct versions 16 (Revision history begins at Rev E) 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.

1963aff For more information www.linear .com/L T1963A relaTeD parTs Typical applicaTion PART NUMBER DESCRIPTION COMMENTS LT1175 500mA, Micropower, Negative LDO V IN: –20V to –4.3V, VOUT(MIN) = –3.8V, VDO = 0.50V, IQ = 45µA, ISD 10µA, DD, SOT-223, PDIP8 Packages LT1185 3A, Negative LDO VIN: –35V to –4.2V, VOUT(MIN) = –2.40V, VDO = 0.80V, IQ = 2.5mA, ISD <1µA, LT1761 100mA, Low Noise Micropower, LDO VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 20µA, ISD <1µA ThinSOT™ Package LT1762 150mA, Low Noise Micropower, LDO V IN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 25µA, ISD <1µA, MS8 Package LT1763 500mA, Low Noise Micropower, LDO V IN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 30µA, ISD <1µA, S8 Package LT1764/ LT1764A 3A, Low Noise, Fast T ransient Response, LDO VIN: 2.7V to 20V, VOUT(MIN) = 1.21V, VDO = 0.34V, IQ = 1mA, ISD <1µA, DD, TO220 Packages LTC1844 150mA, Very Low Drop-Out LDO V IN: 6.5V to 1.6V, VOUT(MIN) = 1.25V, VDO = 0.08V, IQ = 40µA, ISD < 1µA, ThinSOT Package LT1962 300mA, Low Noise Micropower, LDO VIN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.27V, IQ = 30µA, ISD <1µA, MS8 Package LT1964 200mA, Low Noise Micropower, Negative LDO VIN: –0.9V to –20V, VOUT(MIN) = –1.21V, VDO = 0.34V, IQ = 30µA, ISD 3µA, ThinSOT Package LT1965 1.1A, Low Noise, Low Dropout Linear Regulator 290mV Dropout V oltage, Low Noise: 40µVRMS, VIN: 1.8V to 20V, VOUT: 1.2V to 19.5V, stable with ceramic caps, TO-220, DD-Pak, MSOP and 3mm × 3mm DFN Packages LT3020 100mA, Low Voltage VLDO, VIN(MIN) = 0.9V VIN: 0.9V to 10V, VOUT(MIN) = 0.20, VDO = 0.15V, IQ = 120µA, ISD <3µA, DFN, MS8 Packages LT3023 Dual, 2x 100mA, Low Noise Micropower, LDO V IN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 40µA, ISD <1µA, DFN, MS10 Packages LT3024 Dual, 100mA/500mA, Low Noise Micropower, LDO V IN: 1.8V to 20V, VOUT(MIN) = 1.22V, VDO = 0.30V, IQ = 60µA, ISD <1µA, DFN, TSSOP Packages LT3080/ LT3080-1 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator 300mV Dropout V oltage (2-Supply Operation), Low Noise: 40µVRMS, VIN: 1.2V to 36V, VOUT: 0V to 35.7V, current-based reference with 1-resistor VOUT set; directly parallelable (no op amp required), stable with ceramic caps, TO-220, SOT-223, MSOP and 3mm × 3mm DFN Packages; “–1” version has integrated internal ballast resistor LT1004-1.2 VIN > 2.7V C1 10µF 80.6k 2.2k 0.01/uni03A9 2.2k LT1963A-1.8 IN SHDN OUT FB GND LT1366 100k LOAD 470/uni03A92 1µF 3.3µF 1963A TA04 NOTE: ADJUST R1 FOR 0A TO 1.5A CONSTANT CURRENT Adjustable Current Source  LINEAR TECHNOLOGY CORPORATION 2005 LT 0913 REV F • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com/L T1963A