MIC28500 Datasheet, PDF (3/29 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control™ Synchronous DC-DC Buck Regulator

Micrel, Inc.
MIC28500
Pin Description (Continued)
Pin
Number
20
4, 9, 10,
11, 12
23
28
1, 3
Pin Name
BST
SW
FS
PVDD
NC
Pin Function
Boost (Output): Bootstrapped voltage to the high-side N-channel internal MOSFET driver. A Schottky
diode is connected between the VDD pin and the BST pin. A boost capacitor of 0.1μF is connected
between the BST pin and the SW pin.
Switch Node (Output): Internal connection for the high-side MOSFET source and low-side MOSFET
drain.
Frequency Setting Pin.
Power Supply for gate driver of bottom MOSFET.
No Connect.
June 2011
3
M9999-060311-B