LM25007 datasheet(3/12 Pages) NSC

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Pin Descriptions

Name

Description

Application Information

Switching Node

Power switching node. Connect to the inductor,

bootstrap capacitor, and free-wheeling diode.

BST

Boost Boot–strap capacitor input

An external capacitor is required between the BST

and the SW pins. A 0.01µF ceramic capacitor is

recommended.

RCL

Current Limit OFF time programming pin

A resistor between this pin and RTN sets the

off-time when current limit is detected. The off-time

is preset to 17 µs if FB = 0V .

RTN

Circuit Ground

Feedback Signal from Regulated Output

This pin is connected to the inverting input of the

internal regulation comparator. The regulation

threshold is 2.5V.

RON/SD

On-time set pin

A resistor between this pin and VIN sets the switch

on-time as a function of Vin. The minimum

recommended on-time is 300ns at the maximum

input voltage.

VCC

Output from the internal high voltage bias

regulator.

If an auxiliary voltage is available to raise the

voltage on this pin above the regulation setpoint

(7V), the internal series pass regulator will

shutdown, reducing the IC power dissipation. Do not

exceed 14V. This output provides gate drive power

for the internal Buck switch. An internal diode is

provided between this pin and the BST pin. A local

0.1uF decoupling capacitor is recommended.

VIN

Input supply voltage

Recommended operating range: 9V to 42V.

Exposed pad, underside of the LLP package

option

Exposed metal pad on the LLP package underside.

It is recommended to connect this pad to the PC

board ground plane to aid in heat dissipation.

LM25007 Datasheet(PDF) 3 Page - National Semiconductor (TI)

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