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LT1764ET Datasheet(PDF) 9 Page - Linear Technology |
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LT1764ET Datasheet(HTML) 9 Page - Linear Technology |
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9 / 16 page  9 LT1764 Series 1764fa OUT (Pin 4): Output. The output supplies power to the load. A minimum output capacitor of 10 µF 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 5): Sense. For fixed voltage versions of the LT1764 (LT1764-1.8/LT1764-2.5/LT1764-3.3), 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 resis- tance (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 exter- nal PC traces will add to the dropout voltage of the regulator. The SENSE pin bias current is 600 µA 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. ADJ (Pin 5): Adjust. For the adjustable LT1764, this is the input to the error amplifier. This pin is internally clamped to ±7V. It has a bias current of 3µA which flows into the pin. The ADJ pin voltage is 1.21V referenced to ground and the output voltage range is 1.21V to 20V. SHDN (Pin 1): Shutdown. The SHDN pin is used to put the LT1764 regulators into a low power shutdown state. The output will be off when the SHDN pin is pulled low. The SHDN pin can be driven either by 5V logic or open- collector logic with a pull-up resistor. The pull-up resistor is required to supply the pull-up current of the open- collector gate, normally several microamperes, and the SHDN pin current, typically 7 µA. If unused, the SHDN pin must be connected to VIN. The device will be in the low power shutdown state if the SHDN pin is not connected. IN (Pin 2): 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 1 µF to 10µF is sufficient. The LT1764 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. GND (Pin 3): Ground. Figure 1. Kelvin Sense Connection IN SHDN 1764 F01 RP OUT VIN SENSE GND LT1764 RP 3 5 4 1 2 + + LOAD PI FU CTIO S |
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