LM2695SD datasheet(3/14 Pages) NSC

Nome de Peças	LM2695SD

Descrição Electrónicos	High Voltage (30V, 1.25A) Step Down Switching Regulator

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Fabricante Electrônico	NSC [National Semiconductor (TI)]

Página de início	http://www.national.com

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Pin Descriptions

Pin Number

Name

Description

Application Information

LLP-10

TSSOP-14

1

2

SW

Switching Node

Internally connected to the buck switch source.

Connect to the inductor, free-wheeling diode, and

bootstrap capacitor.

2

3

BST

Boost pin for bootstrap capacitor

Connect a 0.022 µF capacitor from SW to this pin.

The capacitor is charged from V

CC via an internal

diode during each off-time.

34

I

SEN

Current sense

The re-circulating current flows through the internal

sense resistor, and out of this pin to the

free-wheeling diode. Current limit is nominally set at

1.25A.

45

S

GND

Sense Ground

Re-circulating current flows into this pin to the

current sense resistor.

5

6

RTN

Circuit Ground

Ground for all internal circuitry other than the current

limit detection.

6

9

FB

Feedback input from the

regulated output

Internally connected to the regulation and

over-voltage comparators. The regulation level is

2.5V.

7

10

SS

Softstart

An internal 12.3 µA current source charges an

external capacitor to 2.5V, providing the softstart

function.

811

R

ON/SD

On-time control and shutdown

An external resistor from V

IN to this pin sets the

buck switch on-time. Grounding this pin shuts down

the regulator.

912

V

CC

Output from the startup regulator

Nominally regulates at 7.0V. An external voltage

(8V-14V) can be applied to this pin to reduce

internal dissipation. An internal diode connects V

CC

to V

IN.

10

13

V

IN

Input supply voltage

Nominal input range is 8.0V to 30V.

1,7,8,14

NC

No connection.

No internal connection.

EP

Exposed Pad

Exposed metal pad on the underside of the device.

It is recommended to connect this pad to the PC

board ground plane to aid in heat dissipation.

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