MP1471 – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
MP1471 Rev. 1.01 www.MonolithicPower.com 8
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PIN FUNCTIONS
Package
Pin #
Name Description
1 GND
System Ground. Reference ground of the regulated output voltage: requires extra care
during PCB layout. Connect to GND with copper traces and vias.
2 SW Switch Output. Connect using wide a PCB trace.
3 IN
Supply Voltage. The MP1471 operates from a 4.7V-to-16V input rail. Requires C1 to
decouple the input rail. Connect using a wide PCB trace.
4 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 drops below 140mV to prevent current-limit runaway during a short
circuit fault.
5 EN
EN=HIGH to enable the MP1471. For automatic start-up, connect EN to V
IN
using a 100k
resistor.
6 BST
Bootstrap. Connect a capacitor and a resistor between SW and BS pins to form a floating
supply across the high-side switch driver. Use a 1µF BST capacitor.
