Exposed Pad

Connect to GND

5

FB

6

VOUT

3

SS

1

VIN

2

EN

4

GND

7

VOUT

LMZ10503EXT

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SNVS668H – JUNE 2010 – REVISED SEPTEMBER 2015

5 Pin Configuration and Functions

NDW Package

7-Lead TO-PMOD

Top View

Pin Functions

PIN

TYPE

DESCRIPTION

NAME

NO.

EN

2

Analog

Active-high enable input for the device.

Exposed pad thermal connection. Connect this pad to the PCB ground plane in order to

Exposed Pad

—

Ground

reduce thermal resistance value. It also provides an electrical connection to the input and

output capacitors ground terminals.

Feedback pin. This is the inverting input of the error amplifier used for sensing the output

FB

5

Analog

voltage.

Power ground and signal ground. Connect the bottom feedback resistor between this pin and

GND

4

Ground

the feedback pin.

Soft-start control pin. An internal 2-µA current source charges and external capacitor

SS

3

Analog

connected between this pin and GND (pin 4) to set the output voltage ramp rate during start-

up. This pin can also be used to configure the tracking feature.

A low-ESR input capacitance should be located as close as possible to VIN pin and GND

VIN

1

Power

pin.

This is the output of the internal inductor. Connect an external resistor voltage divider from

VOUT

6, 7

Power

VOUT to FB to ground.

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