NR131D Datasheet, PDF (8/15 Pages) Sanken electric – Ultra light load high efficiency

Ultra light load high efficiency,VIN=17V,Current mode Step-down Io=3A Buck Regulator IC
NR130D series
Tentative
Sep/10/2013
Pin Asignments & Functions
Pin Assignments
Pin assignments & functions of NR130D series
Pin No.
1
2
Symbol
NC or
COMP
IN
Description
NR131D: No Connection.(NC)
NR132D: External phase compensation terminal(COMP)
Power input. VIN supplies the power to the IC.as well as the regulator switches
3
SW Power switching output.
SW supplies power to the output.
Connect the LC filter from SW to the output.
Connect a Schottky Barrier Diode between SW and GND.
Note that a capacitor is required from SW to BS to supply the power the High-side
switch
4
GND Ground
Connect the exposed pad to Pin No.4
5
FB Feedback input Pin to compare Reference Voltage. The feedback threshold is 0.8V.
To set the output voltage, FB Pin is required to connect between resistive voltage
divider R4 and R6.
6
EN Enable input.
Drive EN Pin high to turn on the regulator, low to turn it off.
7
SS Soft-Start and SKIP operation control input.
To set the soft-start period, connect to a capacitor between GND.
To set the Low Ripple SKIP operation, add the resister 510k ohm between SS terminal
and IN terminal.
8
BS High-side Boost input.
BS supplies the drive for High-side Nch-MOSFET switch.
Connect a capacitor and a resistor between SW to BS.
Rev.1.1
SANKEN ELECTRIC CO., LTD.
8
http://www.sanken-ele.co.jp