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LT1965EDD-1.8 Datasheet(PDF) 11 Page - Linear Integrated Systems |
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LT1965EDD-1.8 Datasheet(HTML) 11 Page - Linear Integrated Systems |
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11 / 22 page  LT1965 Series 11 1965fb For more information www.linear.com/LT1965 pin Functions OUT (Pins 1, 2 / 1, 2 / 4 / 4): Output. This pin supplies power to the load. Use a minimum output capacitor of 10µF to prevent oscillations. Large load transient applica- tions require larger output capacitors to limit peak voltage transients. See the Applications Information section for moreinformationonoutputcapacitanceandreverse-output characteristics. SENSE (Pin 3 / 3 / 5 / 5): Sense. For fixed voltage versions of the LT1965 (LT1965-1.5/LT1965-1.8/ LT1965-2.5/ LT1965-3.3), the SENSE pin is the input to the error am- plifier. Optimum regulation is obtained when the SENSE pin is connected to the OUT pin of the regulator. In criti- cal applications, small voltage drops are caused by the resistance (RP) of PCB traces between the regulator and the load. These drops 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 PCB traces will add to the dropout voltage of the regulator. The SENSE pin bias current is 100µA at the nominal rated output voltage. ADJ (Pin 3 / 3 / 5 / 5): Adjust. This pin is the input to the error amplifier. It has a typical bias current of 1.3µA that flows into the pin. The ADJ pin voltage is 1.20V referenced to ground. GND (Pins 4, 5 / 4, 5 / 3 / 3): Ground. For the adjustable LT1965, connect the bottom of the resistor divider, setting output voltage, directly to GND for optimum regulation. SHDN (Pin 6 / 6 / 1 / 1): Shutdown. Pulling the SHDN pin low puts the LT1965 into a low power state and turns the output off. Drive the SHDN pin with either logic or an open collector/drain with a pull-up resistor. The resistor sup- plies the pull-up current to the open collector/drain logic, normallyseveralmicroamperesandtheSHDNpincurrent, typically less than 5.5µA. If unused, connect the SHDN pin to VIN. The SHDN pin cannot be driven below GND unless it is tied to the IN pin. If the SHDN pin is driven below GND while IN is powered, the output will turn on. SHDN pin logic cannot be referenced to a negative supply rail. IN (Pins 7, 8 / 7, 8 / 2 / 2): Input. This pin supplies power to the device. The LT1965 requires a bypass capacitor at IN if located more than six inches from the main input filter capacitor. Include a bypass capacitor in battery-powered circuits as a battery’s output impedance generally rises with frequency. A bypass capacitor in the range of 1µF to 10µF suffices. The LT1965’s design 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 LT1965 behaves as if a diode is in series with its input. No reverse current flows into the LT1965 and no reverse voltage appears at the load. The device protects itself and the load. Exposed Pad (Pin 9 / 9, DFN and MSOP Packages Only): Ground. Tie this pin directly to Pins 4 and 5 and the PCB ground. This pin provides enhanced thermal performance with its connection to the PCB ground. See the Applica- tions Information section for thermal considerations and calculating junction temperature. (DFN/MSOP/DD-Pak/TO-220) Figure 1. Kelvin Sense Connection IN 1965 F01 RP RP OUT VIN SENSE SHDN GND LT1965 + + LOAD |
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