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LT3008ETS8-1.2 Datasheet(PDF) 11 Page - Linear Technology |
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LT3008ETS8-1.2 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LT3008 Series 11 3008fa PIN FUNCTIONS SHDN (Pin 1/Pin 5): Shutdown. Pulling the SHDN pin low puts the LT3008 into a low power state and turns the output off. If unused, tie the SHDN pin to VIN. The LT3008 does not function if the SHDN pin is not connected. The SHDN pin cannot be driven below GND unless 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 rail. GND (Pins 2, 3, 4/Pin 6): Ground. Connect the bottom of the resistor divider that sets output voltage directly to GND for the best regulation. IN (Pin 5/Pin 4): Input. The IN pin supplies power to the device. The LT3008 requires a bypass capacitor at IN 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 0.1μF to 10μF will suffice. The LT3008 withstands reverse voltages on the IN pin with re- spect to ground and the OUT pin. In the case of a reversed input, which occurs with a battery plugged in backwards, the LT3008 acts as if a blocking diode is in series with its input. No reverse current flows into the LT3008 and no reverse voltage appears at the load. The device protects both itself and the load. OUT (Pin 6/Pins 2, 3): Output. This pin supplies power to the load. Use a minimum output capacitor of 2.2μF to prevent oscillations. Large load transient applications require larger output capacitors to limit peak voltage tran- sients. See the Applications Information section for more information on output capacitance and reverse-output characteristics. ADJ (Pin 7/Pin 1): Adjust. This pin is the error amplifier’s inverting terminal. Its 400pA typical input bias current flows out of the pin (see curve of ADJ Pin Bias Current vs Temperature in the Typical Performance Characteristics section). The ADJ pin voltage is 600mV referenced to GND and the output voltage range is 600mV to 44.5V. NC (Pin 8, TSOT-23 Package Only): No Connect. Pin 8 is an NC pin in the TSOT-23 package. This pin is not tied to any internal circuitry. It may be floated, tied to VIN or tied to GND. Exposed Pad (Pin 7, DFN Package Only): Ground. The Exposed Pad (backside) of the DFN package is an electri- cal connection to GND. To ensure optimum performance, solder Pin 7 to the PCB and tie directly to Pin 6. SENSE (Pin 7/Pin 1): Sense. For fixed voltage versions of the LT3008 (LT3008-1.2, LT3008-1.5, LT3008-1.8, LT3008-2.5, LT3008-3.3, LT3008-5), the SENSE pin is the input to the error amplifier. Optimum regulation is 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 resistance (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 Connec- tion). Note that the voltage drop across the external PC traces add to the dropout voltage of the regulator. The SENSE pin bias current is 1μA at the nominal rated out- put 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. (TSOT-23/DFN) IN SHDN 3008 F01 RP OUT VIN SENSE GND LT3008 RP + + LOAD Figure 1. Kelvin Sense Connection |
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