MIC26601 Datasheet, PDF (2/30 Pages) Micrel Semiconductor – 28V, 6A Hyper Speed Control™ Synchronous DC/DC Buck Regulator

Micrel, Inc.
Ordering Information
Part Number
MIC26601YJL
Voltage
Adjustable
Switching Frequency
600kHz
Junction Temperature
Range
–40°C to +125°C
Package
28-Pin 5mm × 6mm MLF^®
Pin Configuration
MIC26601
Lead
Finish
Pb-Free
28-Pin 5mm × 6mm MLF^® (YJL)
Pin Description
Pin Number
1
3
4, 9, 10,
11, 12
2, 5, 6, 7, 8,
21
13,14,15,
16,17,18,19
20
Pin Name
PVDD
NC
SW
PGND
PVIN
BST
Pin Function
5V Internal Linear Regulator (Output): PVDD supply is the power MOSFET gate drive supply voltage
and created by internal LDO from V_IN. When V_IN < +5.5V, PVDD should be tied to PVIN pins. A 2.2µF
ceramic capacitor from the PVDD pin to PGND (Pin 2) must be place next to the IC.
No Connect.
Switch Node (Output): Internal connection for the high-side MOSFET source and low-side MOSFET
drain. Due to the high-speed switching on this pin, the SW pin should be routed away from sensitive
nodes.
Power Ground. PGND is the ground path for the MIC26601 buck converter power stage. The PGND
pins connect to the low-side N-Channel internal MOSFET gate drive supply ground, the sources of
the 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.
High-Side N-internal MOSFET Drain Connection (Input): The PV_IN operating voltage range is from
4.5V to 28V. 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 MOSFET driver. A Schottky diode is
connected between the PVDD pin and the BST pin. A boost capacitor of 0.1μF is connected between
the BST pin and the SW pin. Adding a small resistor at the BST pin can slow down the turn-on time of
high-side N-Channel MOSFETs.
July 2011
2
M9999-071311-A