MP1493 – 3A, 4.2V-16V INPUT, FAST TRANSIENT SYNCHRONOUS STEP-DOWN CONVERTER
PIN FUNCTIONS
SOIC-8
Pin #
1
2
3
4
5
6
7
8
Name
IN
GND
SW
BST
BYP
EN
FB
FREQ
Description
Supply Voltage. The MP1493 operates from a +4.2V to +16V input rail. C1 is needed to
decouple the input rail. Use wide PCB traces and multiple vias to make the connection.
System Ground. This pin is the reference ground of the regulated output voltage. For this
reason care must be taken in PCB layout.
Switch Output. Use wide PCB traces and multiple vias to make the connection.
Bootstrap. A capacitor connected between SW and BST pins is required to form a floating
supply across the high-side switch driver.
Internal LDO output. Decouple with a 1µF ceramic capacitor. X7R or X5R grade dielectric
ceramic capacitors are recommended for their stable temperature characteristics.
EN=1 to enable the MP1493. For automatic start-up, connect EN pin to VIN with a pull-up
resistor.
Feedback. An external resistor divider from the output to GND, tapped to the FB pin, sets
the output voltage.
Switching frequency setting pin during CCM operation. Connect a resistor R
7
to IN to set the
switching frequency. An optional 1nF decoupling capacitor can be added to improve any
switching frequency jitter that may be present.
MP1493 Rev. 1.15
12/9/2013
www.MonolithicPower.com
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