MP1496 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PIN FUNCTIONS
Package
Pin #
1
2
3
4
5
6
7
Name
SS
Description
Soft-Start. Connect an external capacitor to program the soft start time for the switch
mode regulator.
Supply Voltage. The MP1496 operates from a 4.5V-to-16V input rail. C1 decouples the
IN
input rail. Use wide PCB trace to make the connection.
SW
Switch Output. Connect using a wide PCB trace.
System Ground. Reference ground of the regulated output voltage. Use special care in
GND
PCB layout: Connect to GND with copper and vias.
Bootstrap. Connect a capacitor between SW and BST pins to form a floating supply
BST
across the high-side switch driver. A 10Ω resistor placed between SW and BST cap. is
strongly recommended to reduce SW spike voltage.
Enable/Synchronize. EN high to enable the MP1496. Apply an external clock to
EN/SYNC
EN/SYNC pin to change the switching frequency.
Bias Supply. Decouple with 0.1μF-to-0.22μF cap. The capacitance should not exceed
VCC
0.22μF. VCC capacitor should be put closely to VCC pin and GND pin.
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
FB
when the FB voltage is below 400mV to prevent current-limit runaway during a short-
circuit fault.
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MP1496 Rev. 1.05
12/26/2012
www.MonolithicPower.com
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© 2012 MPS. All Rights Reserved.
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