MP1470B – SYNCHRONOUS, STEP-DOWN CONVERTER WITH INTERNAL MOSFETS
PIN FUNCTIONS
Package
Pin #
Name Description
System ground. GND is the reference ground of the regulated output voltage: it requires
extra care during PCB layout. Connect to GND with copper traces and vias.
1
2
3
GND
SW
IN
Switch output. Connect using a wide PCB trace.
Supply voltage. The MP1470B operates from a 4.7V to 16V input rail. IN requires C1 to
decouple the input rail. Connect using a wide PCB trace.
Feedback. Connect to the tap of an external resistor divider from the output to GND to set
the output voltage. The frequency foldback comparator lowers the oscillator frequency
when the FB voltage drops below 140mV to prevent current-limit runaway during a short-
circuit fault.
4
FB
EN = high to enable the MP1470B. For automatic start-up, connect EN to VIN using a
100kꢀ resistor.
5
6
EN
Bootstrap. Connect a capacitor and a resistor between SW and BST to form a floating
supply across the high-side switch driver. Use a 1µF BST capacitor.
BST
MP1470B Rev. 1.0
8/25/2015
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