MIC28510_12 Datasheet, PDF (2/30 Pages) Micrel Semiconductor – 75V/4A Hyper Speed Control Synchronous DC/DC Buck Regulator

Micrel, Inc.
Ordering Information
Part Number
MIC28510YJL
Junction Temperature Range
40C to 125C
Pin Configuration
Package
28-pin 5mm  6mm MLF^®
MIC28510
Lead Finish
Pb-Free
28-Pin 5mm  6mm MLF^® (JL)
Pin Description
Pin Number
1, 3
Pin Name
NC
2, 5, 6,
7, 8, 21
PGND
4, 9, 10,
11, 12
13, 14, 15, 16,
17, 18, 19
SW
PVIN
20
BST
22
CS
Pin Function
No Connect.
Power Ground. PGND is the ground path for the MIC28510 buck converter power stage. The
PGND pin connects to the sources of low-side N-Channel internal MOSFETs, the negative
terminals of input capacitors, and the negative terminals of output capacitors. The loop for the
power ground should be as small as possible and separate from the signal ground (SGND) loop.
Switch Node (Output). Internal connection for the high-side MOSFET source and low-side
MOSFET drain.
High-Side Internal N-Channel MOSFET Drain Connection (Input).The PVIN operating voltage
range is from 4.5V to 75V. Input capacitors between the PVIN pins and the power ground (PGND)
are required and keep the connection short.
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.
Current Sense (Input). High current output driver return. The CS pin connects directly to the switch
node. Due to the high-speed switching on this pin, the CS pin should be routed away from
sensitive nodes. CS pin also senses the current by monitoring the voltage across the low-side
internal MOSFET during OFF-time.
March 2012
2
M9999-030912-A