MP2158 – 1A, 6V, 1.5MHz SYNCHRONOUS STEP-DOWN SWITCHER

MP2158 Rev. 1.0

www.MonolithicPower.com

7

10/10/2012

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PIN FUNCTIONS

Pin #

Name Description

8

PG

Power Good Indicator. The output of this pin is an open drain with internal pull up resistor

to IN. PGOOD is pulled up to IN when the FB voltage is within 10% of the regulation

level, if FB voltage is out of that regulation range, it is LOW.

7

VIN

Supply Voltage. The MP2158 operates from a +2.5V to +6V unregulated input. C1 is

needed to prevent large voltage spikes from appearing at the input.

6

SW

Switch Output

5

PGND Power ground

4

OUT

Input sense pin for output voltage

3

AGND Analogy ground for internal control circuit

2

FB

Feedback pin. An external resistor divider from the output to GND, tapped to the FB pin,

sets the output voltage.

1

EN

On/Off Control