configurable, power-management IC (PMIC) featuring five
synchronous buck regulators, one boost regulator and
2
high-speed I C 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
2
stand-by mode can be achieved either by I C
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.
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 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.
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.
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)
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 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
15mm × 15mm × 1.25mm solution size
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
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
http://www.micrel.com
March 3, 2015
Revision 2.0
Micrel, Inc.
MIC7400
Typical Application
Ordering Information
Part Number
MIC7400YFL
Marking
7400
YWWS
X
X 7400
X YYWW
X
Output Voltages
1.8V, 1.1V, 1.8V
1.05V, 1.25V, 12V
Features
STBY – Active Low
Falling Edge (DEFAULT)
Package
(1)
Lead
Finish
Pb-
Free
36-Pin
4.5mm × 4.5mm FQFN
36-Pin
4.5mm × 4.5mm FQFN
MIC7400-XXXXYFL
(2)
Configurable
Configurable
Pb-
Free
Notes:
1. GREEN, RoHS-compliant package. Lead finish is Matte Tin. Mold compound is Halogen Free.
2. Configurable options available upon request. Contact Marketing.
March 3, 2015
2
Revision 2.0
Micrel, Inc.
MIC7400
Table of Contents
List of Figures .......................................................................................................................................................................... 5
List of Tables ........................................................................................................................................................................... 6
Absolute Maximum Ratings .................................................................................................................................................. 10
Programmable Buck Soft-Start Control ............................................................................................................................. 25
Buck Digital Voltage Control (DVC) ................................................................................................................................... 26
Programmable Boost Soft-Start Control ............................................................................................................................ 27
Boost Digital Voltage Control (DVC) ................................................................................................................................. 28
Buck Current Limit ............................................................................................................................................................. 28
Boost Current Limit ............................................................................................................................................................ 29
Global Power Good Pin ..................................................................................................................................................... 29
Standard Delay .................................................................................................................................................................. 29
Safe Start-Up into a Pre-Biased Output ............................................................................................................................ 32
Buck Regulator Power Dissipation .................................................................................................................................... 32
Total Power Dissipation ..................................................................................................................................................... 32
Power Derating .................................................................................................................................................................. 33
Normal Power-Up Sequence for Outputs .......................................................................................................................... 35
Bill of Materials ...................................................................................................................................................................... 38
March 3, 2015
3
Revision 2.0
Micrel, Inc.
MIC7400
Table of Contents (Continued)
PCB Layout Guidelines
General .............................................................................................................................................................................. 39
IC ....................................................................................................................................................................................... 39
Package Information and Recommended Landing Pattern .................................................................................................. 45
Appendix A ............................................................................................................................................................................ 46
I C Control Register ........................................................................................................................................................... 47
Serial Port Operation ......................................................................................................................................................... 47
Special Host I C Commands ......................................................................................................................................... 48
Special Keys .................................................................................................................................................................. 48
Appendix B ............................................................................................................................................................................ 49
Power Good Register (00’h) .......................................................................................................................................... 49
Figure 7. Boost DVC Control Ramp .................................................................................................................................... 28
Figure 8. Standard Delay Time ........................................................................................................................................... 29
Figure 10. POR ..................................................................................................................................................................... 30
Figure 12. I C Stand-By Mode .............................................................................................................................................. 31
Figure 15. Pre-Biased Output Voltage .................................................................................................................................. 32
Figure 16. Power Dissipation ................................................................................................................................................ 33
Figure 17. Power Derating Curve.......................................................................................................................................... 33
Figure 18. Hot Plug Input Voltage Spike ............................................................................................................................... 34
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