MP2166

– 6V, DUAL 2A/2A OR 3A/1A, SYNC, BUCK REGULATOR WITH PG AND SS

MP2166 Rev. 1.0

www.MonolithicPower.com

12

3/14/2017

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© 2017 MPS. All Rights Reserved.

PIN FUNCTIONS

Package

Pin #

Name

Description

1

PGND2

Power ground of channel 2. Connect PGND2 with larger copper areas to the negative

terminals of the input and output capacitors.

2

SW2

Switch node connection to the inductor for channel 2. SW2 connects to the internal

high- and low-side power MOSFET switches of the channel 2 buck.

3

VIN2

Input supply for channel 2. A decoupling capacitor to ground is required close to VIN2

to reduce switching spikes.

4

SS2

Soft start for channel 2.

5

FB2

Feedback for channel 2. FB2 is the input to the error amplifier of channel 2. An

external resistive divider connects FB2 between the output and ground. The voltage on

FB2 compares to the internal 0.6V reference to set the regulation voltage of channel 2.

6

AGND

Analog ground. Connect AGND to PGND externally.

7

VCC

Power supply to the internal regulator for both channels. Decouple with a 0.1µF to

1µF capacitor between VCC and AGND.

8

CCM

AAM or forced CCM control. Pull CCM high to enter forced CCM mode; pull CCM low

to enter AAM mode at light load. Do not float CCM.

9

FB1

Feedback for channel 1. FB1 is the input to the error amplifier of channel 1. An

external resistive divider connects FB1 between the output and GND. The voltage on

FB1 compares to the internal 0.6V reference to set the regulation voltage of channel 1.

10

SS1

Soft start for channel 1.

11

VIN1

Input supply for channel 1. A decoupling capacitor to ground is required close to VIN1

to reduce switching spikes.

12

SW1

Switch node connection to the inductor for channel 1. SW1 connects to the internal

high- and low-side power MOSFET switches of the channel 1 buck.

13

PGND1

Power ground of channel 1. Connect PGND1 with larger copper areas to the negative

terminals of the input and output capacitors.

14

PG1

Power good for channel 1.

15

EN1

Enable control for channel 1.

16

FREQ

Frequency set. Connect a resistor to GND to set the switching frequency. The

switching frequency can be synchronized by an external clock via FREQ.

17

EN2

Enable control for channel 2.

18

PG2

Power good for channel 2.