MP2492 – 2A, 55V, 100kHz WITH PROGRAMMABLE OUTPUT CURRENT LIMIT

MP2492 Rev. 1.0

www.MonolithicPower.com

4

12/20/2010

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PIN FUNCTIONS

QFN10

Pin #

SOIC-8

Pin #

Name

Description

1

1

VIN

Supply Voltage. The MP2492 operates from a +4.5V to +55V unregulated input.

as close to the IC as possible. It is the drain of the internal power device and

power supply for the whole chip.

2

2

GND

Exposed

Pad

Ground. This pin is the voltage reference for the regulated output voltage. For this

reason care must be taken in its layout. This node should be placed outside of the

noise into the part, Exposed Pad must be connected to Ground pin.

3

EN

On/Off Control Input.

4

3

FB

An external resistor divider from the output to GND, tapped to the FB pin sets the

output voltage.

5

4

SS

Connect to an external capacitor used for Soft-Start and compensation for current

limiting loop.

6

5

ISN

Negative Current Sense Input for load current limiting.

7

6

ISP

Positive Current Sense

8

PGOOD

Power good signal. When FB is less than 90% of 0.8V, PGOOD is low. It is an

open-drain output. Use a high value pull-up resistor externally to pull it up to

system power supply.

9

7

BST

Bootstrap. This capacitor is needed to drive the power switch’s gate above the

supply voltage. It is connected between SW and BST pins to form a floating

supply across the power switch driver. An on-chip regulator is used to charge up

the external boot-strap capacitor. If the on-chip regulator is not strong enough, one

optional diode can be connected from IN or OUT to charge the external boot-strap

capacitor.

10

8

SW

Switch Output. It is the source of power device.