LM5009MM datasheet(3/14 Pages) NSC

3 / 14 page

Pin Descriptions

Name

Description

Application Information

Switching output

Power switching output. Connect to the inductor,

re-circulating diode, and bootstrap capacitor.

BST

Boost Pin

An external capacitor is required between the BST

and the SW pins. A 0.01µF ceramic capacitor is

recommended. An internal diode charges the

capacitor from V

CC.

RCL

Current Limit off-time set pin

A resistor between this pin and RTN sets the

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

is preset to 35µs if FB = 0V.

RTN

Ground pin

Ground for the entire circuit.

Feedback input 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 V

IN. The minimum

recommended on-time is 250ns at the maximum

input voltage. This pin can be used for remote

shutdown.

VCC

Output from the internal high voltage startup

regulator. Regulated at 7.0V.

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 voltage provides gate drive power

for the internal Buck switch. An internal diode is

provided between this pin and the BST pin. A local

0.1µF decoupling capacitor is required.

VIN

Input voltage

Recommended operating range: 9.5V to 95V.

Exposed Pad (LLP Package only)

Exposed metal pad on the underside of the device.

It is recommended to connect this to the PC board

ground plane to aid in heat dissipation.

LM5009MM Datasheet(PDF) 3 Page - National Semiconductor (TI)

LM5009MM Datasheet(HTML) 3 Page - National Semiconductor (TI)

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