LT3027 LINER [Linear Technology], LT3027 Datasheet
LT3027
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LT3027 Summary of contents
Page 1
... Quiescent current is well controlled in dropout. The LT3027 regulator is 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 pro- tection, current limiting and thermal limiting protection ...
Page 2
... I < 100mA IN LOAD = 1mA LOAD = 1mA to 100mA LOAD = 1mA to 100mA LOAD ORDER PART NUMBER TOP VIEW 10 OUT2 LT3027EMSE 9 IN2 11 LT3027IMSE 8 IN1 7 SHDN1 6 OUT1 MSE PART MSE PACKAGE MARKING LTBKK = 40°C/ W, θ = 10° LTBMD = 25°C. (Note 2) A MIN ...
Page 3
... Note 8: ADJ1 and ADJ2 pin bias current flows into the pin. Note 9: SHDN1 and SHDN2 pin current flows into the pin. Note 10: For the LT3027 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 ...
Page 4
... LT3027 W U TYPICAL PERFOR A CE CHARACTERISTICS Typical Dropout Voltage 500 450 400 350 T = 125°C J 300 250 T = 25°C J 200 150 100 100 0 OUTPUT CURRENT (mA) 3027 G01 Quiescent Current 250k 5µ ...
Page 5
... INPUT VOLTAGE ( 10µF OUT C = 1µF OUT 10 100 1000 3027 G18 LT3027 SHDN1 or SHDN2 Pin Input Current 1.4 1.2 1.0 0.8 0.6 0.4 0 – –25 TEMPERATURE (°C) 3027 G11 Current Limit 350 300 250 200 ...
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... LT3027 W U TYPICAL PERFOR A CE CHARACTERISTICS Input Ripple Rejection OUT (NOMINAL 0.5V RIPPLE P 120Hz 50mA L 0 –50 – 100 125 TEMPERATURE (°C) 3027 G20 Minimum Input Voltage 2.5 2 100mA L 1 50mA L 1.0 0.5 0 – ...
Page 7
... OUT I = 100mA L V SET FOR 5V OUT OUT 100µV/DIV 3027 G30 = 6V = 10µF = 10µF SET FOR 5V OUT 1200 1600 2000 3027 G32 LT3027 10Hz to 100kHz Output Noise C = 100pF BYP V OUT 100µV/DIV 1ms/DIV 3027 G28 C = 10µF OUT I = 100mA L V ...
Page 8
... The ADJ1 and ADJ2 pin voltage is 1.22V referenced to ground and the output voltage range is 1.22V to 20V. BYP1/BYP2 (Pins 5/1): Bypass. The BYP1/BYP2 pins are used to bypass the reference of the LT3027 regulator to achieve low noise performance from the regulator. The BYP1/BYP2 pins are clamped internally to ±0.6V (one V ) from ground ...
Page 9
... At V OUT (12V/1.22V)(–1mV) = – 9.8mV Bypass Capacitance and Low Noise Performance The LT3027 regulator may be used with the addition of a bypass capacitor from V 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 ...
Page 10
... U U APPLICATIO S I FOR ATIO Output Capacitance and Transient Response The LT3027 regulator is designed to be stable with a wide range of output capacitors. The ESR of the output capaci- tor affects stability, most notably with small capacitors. A minimum output capacitor of 1µF with an ESR of 3Ω or less is recommended to prevent oscilla- tions ...
Page 11
... Characteristics section. Power dissipation will be equal to the sum of the two components listed above. Power dissipation from both channels must be considered dur- ing thermal analysis. The LT3027 regulator has internal thermal limiting de- signed to protect the device during overload conditions For continuous normal conditions, the maximum junction temperature rating of 125° ...
Page 12
... When the IN pins of the LT3027 are forced below the cor- responding OUT pins or the OUT pins are pulled above the IN pins, input current will typically drop to less than 2µA. ...
Page 13
... SHDN1 TRACK1 SHDN2 ADJ2 FB2 TRACK2 GND GND 243k V SHDN1/SHDN2 1V/DIV V OUT1 1V/DIV V OUT2 1V/DIV 2ms/DIV Startup Time 100 10 1 0.1 10 100 1000 C (pF) BYP 1µF BYP1 OUT1 2.5V 10µF BYP2 OUT2 1.8V 115k 10µF 3027 TA04 LT3027 3027 TA02b 10000 3027 TA02c 3027f 13 ...
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... LT3027 PACKAGE DESCRIPTIO 3.50 ±0.05 1.65 ±0.05 2.15 ±0.05 (2 SIDES) 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS Package 10-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1699) 0.675 ±0.05 PIN 1 PACKAGE TOP MARK OUTLINE (SEE NOTE 6) 0.200 REF NOTE: 1 ...
Page 15
... TYP 0.53 ± 0.152 1.10 (.021 ± .006) (.043) MAX DETAIL “A” SEATING PLANE 0.17 – 0.27 (.007 – .011) TYP LT3027 BOTTOM VIEW OF EXPOSED PAD OPTION 2.06 ± 0.102 (.081 ± .004) 1 1.83 ± 0.102 (.072 ± .004) 10 0.497 ± 0.076 (.0196 ± .003) 10 ...
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... LT3027 U TYPICAL APPLICATIO S V IN1 3.7V TO 20V IN1 OUT1 1µF 0.01µF BYP1 V IN2 ADJ1 2.9V TO 20V IN2 LT3027 1µF OUT2 0.01µF OFF ON SHDN1 BYP2 SHDN2 ADJ2 GND 0.47µF RELATED PARTS PART NUMBER DESCRIPTION LT1185 3A, Negative LDO LT1761 100mA, Low Noise Micropower, LDO LT1762 ...