MIC7401 Datasheet, PDF (7/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator plus One-Boost with HyperLight Load®, I2C Control, and Enable

Micrel, Inc.
Pin Configuration
MIC7401
36-Pin 4.5mm × 4.5mm FQFN (FL)
(Top View)
Pin Description
Pin Number
1
2
3
4
5
6
7
8
Pin Name
SW2
PVIN2
OUT2
PVIN3
SW3
PGND3
OUT3
PVIN4
Description
Switch Pin 2 (Output): Inductor connection for the synchronous step-down regulator. Connect the
inductor between the output capacitor and the SW2 pin.
Power Supply Voltage 2 (Input): Input supply to the source of the internal high-side P-channel
MOSFET. An input capacitor between PVIN2 and the power ground PGND2 pin is required and to be
placed as close as possible to the IC.
Output Voltage Sense 2 (Input): This pin is used to sense the output voltage. Connect OUT2 as close
to the output capacitor as possible to sense output voltage. Also provides the path to discharge the
output through an internal 90Ω resistor when disabled. This pull-down feature is programmed through
the PULLD[x] register.
Power Supply Voltage 3 (Input): Input supply to the source of the internal high-side P-channel
MOSFET. An input capacitor between PVIN3 and the power ground PGND3 pin is required and to be
placed as close as possible to the IC.
Switch Pin 3 (Output): Inductor connection for the synchronous step-down regulator. Connect the
inductor between the output capacitor and the SW3 pin.
Power Ground 3: The power ground for the synchronous buck converter power stage. The PGND pin
connects to the sources of the internal low-side N-Channel MOSFET, the negative terminals of input
capacitors, and the negative terminals of output capacitors.
Output Voltage Sense 3 (Input): This pin is used to sense the output voltage. Connect OUT3 as close
to the output capacitor as possible to sense output voltage. Also provides the path to discharge the
output through an internal 90Ω resistor when disabled. This pull-down feature is programmed through
the PULLD[x] register.
Power Supply Voltage 4 (Input): Input supply to the source of the internal high-side P-channel
MOSFET. An input capacitor between PVIN4 and the power ground PGND4 pin is required and to be
placed as close as possible to the IC.
March 16, 2015
7
Revision 1.0