MIC23156 Datasheet, PDF (1/22 Pages) Micrel Semiconductor – 1.5A, 3MHz Synchronous Buck Regulator with HyperLight Load® and I2C Control for Dynamic Voltage Scaling

MIC23156
1.5A, 3MHz Synchronous Buck Regulator
with HyperLight Load^® and I²C Control for
Dynamic Voltage Scaling
General Description
The MIC23156 is a high-efficiency 1.5A synchronous buck
regulator with HyperLight Load^® mode and dynamic
voltage scaling control through I²C. HyperLight Load
provides very high efficiency at light loads and ultra-fast
transient response. The ability to dynamically change the
output voltage and maintain high output voltage accuracy
make the MIC23156 perfectly suited for supplying
processor core voltages. 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. Fast mode plus I²C provides output
voltage and chip enable/disable control from standard I²C
bus with I²C clock rates of 100kHz, 400kHz, and 1MHz.
The MIC23156 is designed for use with 1µH, and an
output capacitor as small as 2.2µF that enables a total
solution size, less than 1mm in height.
The MIC23156 is available in both 16-ball, 0.4mm Pitch,
1.81mm x 1.71mm wafer level chip scale (WLCSP), and
17-pin 2.8mm x 2.5mm MLF^® packages with an operating
junction temperature range of –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage: 2.7V to 5.5V
• Up to 1.5A output current
• 1MHz I²C-controlled adjustable output
− V_OUT = 0.7 to 2.4V in 10mV steps
• High output voltage accuracy (±1.5% over temperature)
• Fast pin–selectable output voltage
• Programmable soft-start using external capacitor
• Ultra-low quiescent current of 30µA when not switching
• Thermal-shutdown and current-limit protection
• Safe startup in to pre-biased output
• Stable with 1µH output inductor and 2.2µF ceramic
capacitor
• Up to 93% peak efficiency
• −40°C to +125°C junction temperature range
Applications
• Mobile handsets
• Solid state drives (SSD)
• WiFi/WiMx/WiBro modules
• Portable applications
Typical Application
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel [phone] • fax + 1 [phone] • http://www.micrel.com
April 22, 2013
Revision 1.0