LM5007MM datasheet(3/12 Pages) NSC

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Pin Description

NAME

DESCRIPTION

APPLICATION INFORMATION

Switching Node

Power switching node. Connect to the LC output

filter.

BST

Boost Boot–strap capacitor input

An external capacitor is required between the BST

and the SW pins. A 0.01uF ceramic capacitor is

recommended. An internal diode between Vcc and

BST completes the Buck gate drive bias network.

Current Limit OFF time programming pin

Toff = 10

-5 / (0.59 + (FB / 7.22 x 10−6 xR

CL))

A resistor between this pin and RTN determines the

variation of off time, along with the FB pin voltage,

per cycle while in current limit. The off time is preset

to 17uS if FB =0V and decreases as the FB pin

voltage increases.

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.

On time set pin

Ton = 1.42 x 10

-10 R

ON / Vin

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. V

CC is nominally regulated to 7 Volts.

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. Series

pass regulator is current limited to 10mA.

Vin

Input supply voltage

Recommended operating range: 9V to 75V

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