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LT1764A Datasheet(PDF) 9 Page - Linear Dimensions Semiconductor |
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LT1764A Datasheet(HTML) 9 Page - Linear Dimensions Semiconductor |
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9 / 16 page  LT3021/LT3021-1.2/ LT3021-1.5/LT3021-1.8 9 3021fc PIN FUNCTIONS OUT (Pins 3, 4/Pin 2): These pins supply power to the load. Use a minimum output capacitor of 3.3μF to prevent oscil- lations. Applications with large load transients require larger output capacitors to limit peak voltage transients. See the Applications Information section for more information on output capacitance and reverse output characteristics. SENSE (Pin 7/Pin 3, Fixed Voltage Device Only): This pin is the sense point for the internal resistor divider. It should be tied directly to the OUT pins for best results. ADJ (Pin 7/Pin 3): This pin is the inverting terminal to the error amplifier. Its typical input bias current of 20nA flows out of the pin (see curve of ADJ Pin Bias Current vs Tem- perature in the Typical Performance Characteristics). The ADJ pin reference voltage is 200mV (referred to GND). AGND (Pin 8/Pin 4): Ground. PGND (Pins 10, 17/Pin 6): Ground. SHDN (Pin 9/Pin 5): The SHDN pin puts the LT3021 into a low power state. Pulling the SHDN pin low turns the output off. Drive the SHDN pin with either logic or an open collector/drain device with a pull-up resistor. The pull-up resistor supplies the pull-up current to the open collector/ drain logic, normally several microamperes, and the SHDN pin current, typically 2.5μA. If unused, connect the SHDN pin to VIN. The LT3021 does not function if the SHDN pin is not connected. IN (Pins 12, 14/Pin 8): These pins supply power to the device. The LT3021 requires a bypass capacitor at IN if it is more than six inches away from the main input filter capacitor. The output impedance of a battery rises with frequency, so include a bypass capacitor in battery-pow- ered circuits. A bypass capacitor in the range of 3.3μF to 10μF suffices. The LT3021 withstands reverse voltages on the IN pin with respect to ground and the OUT pin. In the case of a reversed input, which occurs if a battery is plugged in backwards, the LT3021 acts as if a diode is in series with its input. No reverse current flows into the LT3021 and no reverse voltage appears at the load. The device protects itself and the load. EXPOSED PAD (Pin 17, DH16 Package Only): Ground. Solder Pin 17 to the PCB ground. Connect directly to Pins 8, 10 for best performance. NC (Pins 1, 2, 5, 6, 11, 13, 15, 16/Pins 1, 7): No Connect. No connect pins may be floated, tied to IN or tied to GND. (DH Package/S8 Package) BLOCK DIAGRAM (DH Package/S8 Package) SHUTDOWN – + CURRENT GAIN THERMAL SHUTDOWN R3 R2 R1 3021 BD D1 Q1 D2 Q2 ERROR AMP NO-LOAD RECOVERY Q3 IN (12, 14/8) OUT (3,4/2) OUT SENSE (7/3) NOTE: FOR LT3021 ADJUST PIN (7/3) IS CONNECTED TO THE ADJUST PIN, R1 AND R2 ARE EXTERNAL. FOR LT3021-1.X PIN (7/3) IS CONNECTED TO THE OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL. GND (8,10,17/4,6) ADJ (7/3) SHDN (9/5) 200mV 212mV BIAS CURRENT AND REFERENCE GENERATOR FIXED VOUT 1.2V 1.5V 1.8V R1 20k 20k 20k R2 100k 130k 160k 25k |
Similar Part No. - LT1764A |
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Similar Description - LT1764A |
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