MP3900 – HIGH EFFICIENCY BOOST CONTROLLER

MP3900 Rev. 1.0

www.MonolithicPower.com

5

12/17/2013

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PIN FUNCTIONS

Pin #

Name

Description

1

PGND

Power Ground Pin which is gate driver return.

2

COMP/RUN

Enable and Compensation. An internal 0.5µA current charges the pin components

above the 0.14V Run threshold to turn on the part. Below this threshold, the part is shut

3

FB

Feedback forces this pin voltage to the 0.8V internal reference potential. Do not allow

this pin to rise above 1.2V in the application. If this pin is higher than 1.3V, the IC will go

into test mode and turn off the gate driver.

4

SGND

Signal Ground. The SGND and PGND pins should be tied together and returned directly

to the ground connection side of the output capacitor.

5

ISENSE

Current Sense. An internal clamp will limit this pin voltage to typically 36V. Do not

connect this pin directly to the drain of the external MOSFET if the voltage swing

exceeds 30V in the particular application. During normal operation, this pin will sense

the voltage across the external MOSFET or sense resistor if one is used, limiting the

peak inductor current on a cycle-by-cycle basis.

6

NC

No Connect.

7

VCC

Input Supply. Decouple this pin as close as possible to the SGND pin.

8

GATE

This pin drives the external power MOSFET device.