MPM3606 – SYNCHRONOUS STEP-DOWN MODULE WITH INTEGRATED INDUCTOR

MPM3606 Rev. 1.0

www.MonolithicPower.com

9

8/11/2014

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

FB

Feedback. Connect to the tap of an external resistor divider from the output to AGND to

set the output voltage. The frequency fold-back comparator lowers the oscillator

frequency when the FB voltage is below 400mV to prevent current limit runaway during

a short circuit fault. Place the resistor divider as close to the FB pin as possible. Avoid

placing vias on the FB traces.

2

VCC

Internal 5V LDO output. Internal circuit integrates LDO output capacitor, so there is no

need to add external capacitor.

3

AGND

Analog Ground. Reference ground of logic circuit. AGND is internally connected to

PGND. No need add external connections to PGND.

4, 5, 6

SW

Switch Output. Large copper plane is recommended on pin 4, 5 and 6 for better heat

sink.

7, 8, 9

OUT

Power Output. Connect load to this pin. Output capacitor is needed.

10, 15, 19,

20

NC

DO NOT CONNECT. Pin must be left floating.

11

BST

Bootstrap. Bootstrap capacitor is integrated internally. External connection is not

needed.

12, 13, 14

PGND

Power Ground. Reference ground of the power device. PCB layout requires extra care.

For best results, connect to PGND with copper and vias.

16

IN

Supply Voltage. The IN pin supplies power for internal MOSFET and regulator. The

MPM3606 operates from a +4.5V to +21V input rail. Requires a low-ESR, and low-

inductance capacitor to decouple the input rail. Place the input capacitor very close to

this pin and connect it with wide PCB traces and multiple vias.

17

EN

EN=high to enable the module. Float EN pin or connect it to ground will disable the

converter.

18

AAM

Advanced Asynchronous Modulation. AAM pin sources a 6.2μA current from internal

5V supply. Float AAM pin or drive AAM pin high (>2.5V) to force the MPM3606 to

always operate in CCM. Connect a resistor to ground to program AAM voltage in the

range of 0 to1V if non-synchronous mode is required under light load.