NR131S 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
NR130S series
Sep/10/2013
Pin Asignments & Functions
NR131S
NR134S
Pin Assignments
Pin assignments & functions of NR130S series
Pin No.
1
2
3
4
5
6
7
8
Symbol
NC or
IN
IN or
NC
SW
GND
FB
EN
SS
BS
Description
NR131S: No Connection.(NC)
NR134S: Power input. VIN supplies the power to the IC.as well as the regulator switches
NR131s: Power input. VIN supplies the power to the IC.as well as the regulator switches
NR134S: No Connection.(NC)
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
Ground
Connect the exposed pad to Pin No.4
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.
Enable input.
Drive EN Pin high to turn on the regulator, low to turn it off.
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.
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.1.2
SANKEN ELECTRIC CO., LTD.
8
http://www.sanken-ele.co.jp