MIC26901 MICREL [Micrel Semiconductor], MIC26901 Datasheet - Page 2

• Manufacturer Part Number: MIC26901
• Manufacturer: MICREL [Micrel Semiconductor]

Micrel, Inc.
Ordering Information
Pin Configuration
Pin Description
Part Number
MIC26901YJL
July 2011
Pin Number
4, 9, 10, 11,
2, 5, 6, 7, 8,
16,17,18,19
13,14,15,
12
21
20
1
3
Pin Name
Adjustable
Voltage
PGND
PVDD
PVIN
BST
SW
NC
5V Internal Linear Regulator (Output): PVDD supply is the power MOSFET gate drive supply voltage
and created by internal LDO from V
ceramic capacitor from the PVDD pin to PGND (pin 2)
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 MIC26903 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
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.
Pin Function
Switching Frequency
600kHz
28-Pin 5mm × 6mm MLF
Junction Temperature
−40°C to +125°C
IN
2
. When V
Range
®
(YJL)
IN
< +5.5V, PVDD should be tied to PVIN pins. A 2.2µF
must be place next to the IC.
28-Pin 5mm × 6mm MLF
IN
Package
operating voltage range is from
®
M9999-071311-A
Lead Finish
MIC26901
Pb-Free