MIC7400
Five-Channel Buck Regulator
plus One-Boost with HyperLight Load®
and I2C Control
PRELIMINARY
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 in both master and slave mode
with 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
• STBY control input for stand-by low-power mode
• I²C interface up to 3.4MHz
• I²C on-the-fly EEPROM programmability, featuring:
− Buck and boost output voltage scaling
− Power-on-reset threshold and delay
The device offers two distinct modes of operation “stand-
by mode” and “normal mode” intended to provide energy
optimize solution suitable for Portable Handheld, SSD and
Infotainment applications.
In normal mode, the programmable switching converters
can be configured to support variety of start-up
sequencing, timing, soft-start ramp, output voltage levels,
current limit levels and output discharge on each channel.
− Power-up sequencing/sequencing delay
− Buck and boost current limit
In stand-by mode, both output voltage levels and current
limits are programmable. Independent wake-up of the
power management can be achieved both by I2C
communication or external event using GPIO.
− 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
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.
• 1.3MHz buck operation in continuous mode
• Ultra-fast buck transient response
• 15mm × 15mm × 1.25mm solution size
• Thermal-shutdown and current-limit protection
• 36-pin 4.5mm × 4.5mm × 0.85mm FQFN package
• −40°C to +125°C junction temperature range
An embedded 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..
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 supplies
are designed for use with a very-small inductor (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 web site 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 1.0
March 14, 2014
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