MP2155 –HIGH EFFICIENCY SINGLE INDUCTOR BUCK-BOOST CONVERTER WITH 2.2A SWITCHES

MP2155 Rev. 1.0

www.MonolithicPower.com

11

1/26/2014

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PIN FUNCTIONS

Pin #

Name

Description

1

VOUT

Buck-Boost converter output.

2

SW2

Switch pin-Internal switches are connected to this pin. Connect inductor between SW1 and

SW2.

3

PGND

Power ground.

4

SW1

Switch pin-Internal switches are connected to this pin. Connect inductor between SW1 and

SW2.

5

VIN

Supply voltage for power stage.

6

EN

ON/OFF control, it’s not recommended to leave this pin float.

7

MODE/

SYNC

Operation mode selection. If MODE pin is low, the MP2155 automatically switches between

PSM and fixed frequency PWM according to the load level. If MODE pin is pulled high, the

MP2155 works always in PWM mode.

External clock can be applied to MODE pin for changing switching frequency.

This pin is sensitive to noise, so it should be strongly pulled up above 1.2V or pulled down

below 0.4V. Must NOT leave it float.

8

VCC

Supply voltage for control stage.

9

AGND

Signal ground, should be connected to PGND externally.

10

FB

Feedback to set output voltage. Keeps this pin and associated trace far from noise source

like SW.

-

EP

Thermal pad, which is recommended to connected to PGND.