MP4572

– 60V, 2A, SYNCHRONOUS STEP-DOWN CONVERTER

MP4572 Rev. 1.0

www.MonolithicPower.com

4

3/9/2020

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PIN FUNCTIONS

Pin #

Name

Description

1

BST

Bootstrap. Connect a capacitor between SW and BST to form a floating supply across the

high-side switch driver.

2

SW

Switch output. SW is the output of the internal power switches. A wide PCB trace is

recommended.

3

PG

Power good indicator. The pin is an open drain; it requires a pull-up resistor to the power

source. PG is pulled up to the power source if the output voltage is within 90% to 108% of

the nominal voltage. It goes low when the output voltage exceeds 116% or falls below 94%

of the nominal voltage.

4

FB

Feedback point. FB is the negative input of the error amplifier. Connect FB to the tap of an

external resistor divider between the output and GND to set the regulation voltage. In

addition, power good and under-voltage lockout circuits use FB to monitor the output

voltage.

5

FREQ

Configurable switching frequency. Connect a resistor to GND to set the switching

frequency.

6

VCC

Internal bias supply. VCC supplies power to the internal control circuit and gate drivers. A

minimum 1µF decoupling capacitor to ground is required close to this pin.

7

GND

IC ground. Connect the pin to larger copper areas to the negative terminals of the input and

output capacitors.

8

IN

Input supply. This pin supplies all power to the converter. Place a decoupling capacitor to

ground, as close as possible to the IC, to reduce switching spikes.

9, 10

NC

No connection. These pins can be connected to GND to improve thermal and EMI

performance in PCB layout.

11

CCM/

SYNCO

Mode selection/synchronization output. Connect the CCM pin to GND through a 10k

Ω to

300k

Ω resistor to force the converter into CCM. Float the CCM pin for nonsynchronous AAM

mode under light-load conditions. CCM/SYNCO is a synchronization output pin. It outputs a

180° out-of-phase clock to the other devices.

12

EN

Enable. Drive EN high to turn on the device, and drive it low or float it to turn off the device.