VIN

1

CS

2

SS

3

FB

4

RT

8

VCC

7

COMP

6

UVLO

5

9

10

OUT

GND

LM5022

SNVS480E – JANUARY 2007 – REVISED OCTOBER 2011

www.ti.com

Connection Diagram

Figure 1. 10-Lead MSOP

Pin Functions

Pin Descriptions

Pin(s)

Name

Description

Application Information

1

VIN

Source input voltage

Input to the start-up regulator. Operates from 6V to 60V.

Inverting input to the internal voltage error amplifier. The non-

2

FB

Feedback pin

inverting input of the error amplifier connects to a 1.25V

reference.

Error amplifier output and PWM

The control loop compensation components connect between this

3

COMP

comparator input

pin and the FB pin.

Output of the internal, high voltage linear

This pin should be bypassed to the GND pin with a ceramic

4

VCC

regulator.

capacitor.

5

OUT

Output of MOSFET gate driver

Connect this pin to the gate of the external MOSFET. The gate

driver has a 1A peak current capability.

6

GND

System ground

Set the start-up and shutdown levels by connecting this pin to the

7

UVLO

Input Under-Voltage Lock-out

input voltage through a resistor divider. A 20 µA current source

provides hysteresis.

Current Sense input

Input for the switch current used for current mode control and for

8

CS

current limiting.

An external resistor connected from this pin to GND sets the

Oscillator frequency adjust pin and

9

RT/SYNC

oscillator frequency. This pin can also accept an AC-coupled input

synchronization input

for synchronization from an external clock.

An external capacitor placed from this pin to ground will be

10

SS

Soft-start pin

charged by a 10 µA current source, creating a ramp voltage to

control the regulator start-up.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

2

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