MP1496 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS

MP1496 Rev. 1.05

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7

12/26/2012

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PIN FUNCTIONS

Package

Pin #

Name

Description

1

SS

Soft-Start. Connect an external capacitor to program the soft start time for the switch

mode regulator.

2

IN

Supply Voltage. The MP1496 operates from a 4.5V-to-16V input rail. C1 decouples the

input rail. Use wide PCB trace to make the connection.

3

SW

Switch Output. Connect using a wide PCB trace.

4

GND

System Ground. Reference ground of the regulated output voltage. Use special care in

PCB layout: Connect to GND with copper and vias.

5

BST

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

across the high-side switch driver. A 10Ω resistor placed between SW and BST cap. is

strongly recommended to reduce SW spike voltage.

6

EN/SYNC

Enable/Synchronize. EN high to enable the MP1496. Apply an external clock to

EN/SYNC pin to change the switching frequency.

7

VCC

Bias Supply. Decouple with 0.1μF-to-0.22μF cap. The capacitance should not exceed

0.22μF. VCC capacitor should be put closely to VCC pin and GND pin.

8

FB

Feedback. Connect to the tap of an external resistor divider from the output to GND to set

the output voltage. The frequency fold-back comparator lowers the oscillator frequency

when the FB voltage is below 400mV to prevent current-limit runaway during a short-

circuit fault.