LT3050 datasheet(12/28 Pages) LINER

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LT3065 Series

3065fc

For more information www.linear.com/LT3065

Typical perForMance characTerisTics T

J = 25°C, unless otherwise noted.

IN (Pins 1, 2/Pins 1, 2): Input. These pin(s) supply power

to the device. The LT3065 requires a local IN bypass

capacitor if it is located more than six inches from the main

input filter capacitor. In general, battery output imped-

ance rises with frequency, so adding a bypass capacitor

in battery-powered circuits is advisable. An input bypass

capacitor in the range of 1µF to 10µF generally suffices.

See Input Capacitance and Stability in the Applications

Information section for more information.

The LT3065 withstands reverse voltages on the IN pin

with respect to its GND and OUT pins. In such case, such

as a battery plugged in backwards, the LT3065 behaves

as if a diode is in series with its input. No reverse current

flows into the LT3065 and no reverse voltage appears at

the load. The device protects itself and the load.

SHDN (Pin 3/Pin 3): Shutdown. Pulling the SHDN pin

low puts the LT3065 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

supplies the pull-up current to the open collector/drain

logic, normally several microamperes, and the SHDN

pin current, typically less than 2µA. If unused, connect

the SHDN pin to IN. The LT3065 does not function if the

SHDN pin is not connected.

TEMPERATURE (°C)

–75

204

212

220

125

3065 G53

196

188

200

208

216

192

184

180

–25

–50

150

100

175

VIN = 10V

VIN = 5.6V

VOUT(NOMINAL) = 5V

TEMPERATURE (°C)

–75

510

530

550

125

3065 G54

490

470

500

520

540

480

460

450

–25

–50

150

100

175

5.6V

10V

VOUT(NOMINAL) = 5V

TEMPERATURE (°C)

–75

550

570

590

125

3065 G55

530

510

540

560

580

520

500

490

–25

–50

150

100

175

ADJ PIN RISING THRESHOLD

ADJ PIN FALLING THRESHOLD

PWRGD (Pin 4/Pin 4): Power Good. The PWRGD pin is an

open-drain output that actively pulls low if the output is

less than 90% of the nominal output value. The PWRGD

pin is capable of sinking 50µA. There is no internal pull-up

resistor; an external pull-up resistor must be used.

IMAX (Pin 5/Pin 5): Precision Current Limit Programming.

This pin is the collector of a current mirror PNP that is

1/500th the size of the output power PNP. This pin is also

the input to the current limit amplifier. The current limit

threshold is set by connecting a resistor between the IMAX

pin and GND.

For detailed information on how to set the IMAXpinresistor

value, see the Applications Information section. The IMAX

pin requires a 22nF de-coupling capacitor to ground. If

not used, tie IMAX to GND.

NC (Pins 6, 7, MSE Package Only): No Connect. These

pins have no connection to internal circuitry. These pins

may be floated or connected to GND.

REF/BYP (Pin 6/Pin 8): Bypass/Soft Start. Connecting a

capacitor from this pin to GND bypasses the LT3065’s ref-

erence noise and soft-starts the reference. A 10nF bypass

capacitortypicallyreducesoutputvoltagenoiseto25µVRMS

in a 10Hz to 100kHz bandwidth. Soft-start time is directly

Precision Current Limit,

RIMAX = 1.5k

Precision Current Limit,

RIMAX = 604Ω

PWRGD Threshold Voltage

pin FuncTions (DFN/MSOP)

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