MIC7400
Configurable PMIC, Five-Channel Buck
Regulator Plus One-Boost with
HyperLight Load® and I2C Control
General Description
Features
The MIC7400 is
a
powerful, highly integrated,
• Input voltage: 2.4V to 5.5V
configurable, power-management IC (PMIC) featuring five
synchronous buck regulators, one boost regulator and
high-speed I2C interface with an internal EEPROM.
• Five independent synchronous bucks up to 3A
• One independent non-synchronous boost 200mA
• 200µA quiescent current (all regulators on)
• 93% peak buck efficiency, 85% typical efficiency at 1mA
• Dual power mode: stand-by and normal mode
• I²C interface up to 3.4MHz
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.
• I²C on-the-fly EEPROM programmability, featuring:
− Buck and boost output voltage scaling
− Power-on-reset 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
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. 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.
• 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
• 15mm × 15mm × 1.25mm solution size
• Thermal-shutdown and current-limit protection
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.
• 36-pin 4.5mm × 4.5mm × 0.85mm FQFN package
(0.4mm pitch)
• −40°C to +125°C junction temperature range
Applications
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 MIC7400 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
15mm × 15mm and less than 1mm height.
• 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
The datasheet and other support documentation can be
found on Micrel’s website at: www.micrel.com.
HyperLight Load is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
Revision 2.0
March 3, 2015
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