MIC24052 Datasheet, PDF (2/30 Pages) Micrel Semiconductor – 12V, 6A High-Efficiency Buck Regulator

Micrel, Inc.
Ordering Information
Part Number
MIC24052YJL
Switching
Frequency
600kHz
Voltage
Adjustable
MIC24052
Package
28-Pin 5mm × 6mm QFN
Junction Temperature
Range
−40°C to +125°C
Lead Finish
Pb-Free
Pin Configuration
28-Pin 5mm x 6mm QFN (JL)
(Top View)
Pin Description
Pin Number Pin Name
1
PVDD
2, 5, 6, 7, 8, 21
PGND
3
4, 9, 10, 11, 12
13,14,15,
16,17,18,19
NC
SW
PVIN
20
BST
Pin Function
5V Internal Linear Regulator Output: PVDD supply is the power MOSFET gate drive supply voltage
and created by internal LDO from VIN. When VIN < +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.
Power Ground. PGND is the ground path for the MIC24052 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.
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.
High-Side N-Internal MOSFET Drain Connection input: The PVIN operating voltage range is from
4.5V to 19V. Input capacitors between the PVIN pins and the power ground (PGND) are required to
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.
December 2012
2
M9999-120312-A