MP2209 – 16V, 2A, 600KHz SYNCHRONOUS STEP-DOWN CONVERTER

MP2209 Rev. 1.01

www.MonolithicPower.com

4

7/11/2013

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PIN FUNCTIONS

Pin #

Name

Description

1, 3,

12

PGND,

AGND,

Exposed Pad

Ground. Connect these pins with larger copper areas to the negative terminals of the

input and output capacitors.

Connect exposed pad to GND plane for proper thermal performance.

2

SS

Soft-Start Input. Place a capacitor from SS to AGND. The SS pin sources 5μA. As the

SS voltage rises, the feedback threshold voltage increases to limit the inrush current

during start-up. Do not leave this pin open.

4, 11

SW

Switch Node Connection to the Inductor. These pins connect to the internal high and low-

side power MOSFET switches. All SW pins must be connected together externally.

5, 10

IN

Input Supply. This supplies power to the high side switch. A decoupling capacitor to

ground is required close to this pin to reduce switching spikes.

6

N/C

No Connect.

7

BS

Bootstrap. A capacitor between this pin and SW provides a floating supply for the high-

side gate driver.

8

VCC

Bias Supply. This supplies power to both the internal control circuit and the gate drivers.

A decoupling capacitor to ground is required close to this pin.

9

POK

13

EN/SYNC

Enable and Frequency Synchronization Input Pin. Forcing this pin below 0.4V shuts

down the part. Forcing this pin above 1.6V turns on the part. Applying a 500kHz to 2MHz

clock signal to this pin synchronizes the internal oscillator frequency to the external

source.

14

FB

Feedback. This is the input to the error amplifier. An external resistive divider connected

between the output and GND is compared to the internal 0.8V reference to set the