MIC7401 Datasheet, PDF (1/68 Pages) Micrel Semiconductor – Configurable PMIC, Five-Channel Buck Regulator plus One-Boost with HyperLight Load®, I2C Control, and Enable

MIC7401
Configurable PMIC, Five-Channel
Buck Regulator plus One-Boost with
HyperLight Load^®, I²C Control, and Enable
General Description
The MIC7401 is a powerful, highly-integrated,
configurable, power-management IC (PMIC) featuring five
synchronous buck regulators, one boost regulator, and
high-speed I²C interface with an internal EEPROM.
The device offers two distinct modes of operation “stand-
by mode” and “normal mode” intended to provide an
energy optimized solution suitable for portable handheld,
and infotainment applications.
In normal mode, the programmable switching converters
can be configured to support a variety of features,
including start-up sequencing, timing, soft-start ramp,
output voltage levels, current-limit levels, and output
discharge for each channel.
In stand-by mode the PMIC can configured in a low power
state by either disabling an output or by changing the
output voltage to a lower level. Independent exit from
stand-by mode can be achieved either by I²C
communication or the external STBY pin.
The device has five synchronous buck regulators with
high-speed adaptive on-time control supporting even the
challenging ultra-fast transient requirement for core
supplies. The one boost regulator provides a flash-memory
programming supply that delivers up to 200mA of output
current. The boost is equipped with an output disconnect
switch that opens if a short-to-ground fault is detected.
An internal EEPROM enables a single-chip solution across
many platforms by allowing the designer to customize the
PMIC for their design. Modifications can be made without
the need to re-approve a new PMIC, saving valuable
design resources and time.
All switchers provide light-load efficiency with HyperLight
Load^® mode for buck and PFM mode for boost. An
additional benefit of this proprietary architecture is very-low
output ripple voltage throughout the entire load range with
the use of small output capacitors. The MIC7401 is
designed for use with a small inductors (down to 0.47µH
for buck, 1.5µH for boost), and an output capacitor as
small as 10µF for buck, enabling a total solution size of
12mm × 8.5mm and less than 1mm height on top layer.
The datasheet and other support documentation can be
found on Micrel’s web site at: www.micrel.com.
Features
 Input voltage: 2.4V to 5.5V
 Five independent synchronous bucks up to 3A
 One independent non-synchronous boost 200mA
 200µA quiescent current (all regulators on)
 5µA typical shutdown current
 93% peak buck efficiency, 85% typical efficiency at 1mA
 Dual power mode: stand-by and normal mode
 I²C interface up to 3.4MHz
 I²C on-the-fly EEPROM programmability, featuring:
 Buck and boost output voltage scaling
 Power-on-Reset (PoR) threshold and delay
 Power-up sequencing/sequencing delay
 Buck and boost current limit
 Buck and boost pull-down when disabled
 Individual ON, OFF, and standby modes
 Soft-start and global power-good masking
 23µA buck typical quiescent current
 70µA boost typical quiescent current
 1.5% output accuracy over temperature/line/load
 2.0MHz boost switching frequency
 1.3MHz buck operation in continuous mode
 Ultra-fast buck transient response
 12mm × 8.5mm × 1.25mm solution size (top layer)
 Thermal-shutdown and current-limit protection
 36-pin 4.5mm × 4.5mm × 0.85mm FQFN package
(0.4mm pitch)
 40C to +125C junction temperature range
Applications
 Client and enterprise solid state drives (SSD)
 Consumer and in-vehicle infotainment devices
 Multimedia devices
 Portable handheld devices
 Security camera
 Gaming machines
 Service provider gateways
HyperLight Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
March 16, 2015
Revision 1.0