LT3014_15 datasheet(7/16 Pages) LINER

7 / 16 page

LT3014

3014fd

PIN FUNCTIONS

IN (Pin 1/Pin 8): 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 0.1μF to 10μF is sufﬁcient. The

LT3014 is designed to withstand reverse voltages on the IN

pin with respect to ground and the OUT pin. In the case of

a reversed input, which can happen if a battery is plugged

in backwards, the LT3014 will act as if there is a diode in

series with its input. There will be no reverse current ﬂow

into the LT3014 and no reverse voltage will appear at the

load. The device will protect both itself and the load.

GND (Pin 2/Pins 4, 9): Ground.

SHDN (Pin 3/Pin 5): Shutdown. The SHDN pin is used

to put the LT3014 into a low power shutdown state. The

output will be off when the SHDN pin is pulled low. The

SHDNpincanbedriveneitherby5Vlogicoropen-collector

logic with a pull-up resistor. The pull-up resistor is only

required to supply the pull-up current of the open-collec-

tor gate, normally several microamperes. If unused, the

SHDN pin must be tied to IN or to a logic high.

ADJ (Pin 4/Pin 2): Adjust. This is the input to the error

ampliﬁer. This pin is internally clamped to ±7V. It has a

bias current of 4nA which ﬂows into the pin (see curve

of ADJ Pin Bias Current vs Temperature in the Typical

Performance Characteristics). The ADJ pin voltage is

1.22V referenced to ground, and the output voltage range

is 1.22V to 60V.

OUT (Pin 5/Pin 1): Output. The output supplies power to

the load. A minimum output capacitor of 0.47μF 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.

(SOT-23 Package/DD Package)

LT3014 Fiches technique(PDF) 7 Page - Linear Technology