MIC23451 Datasheet, PDF (1/20 Pages) Micrel Semiconductor – 3MHz, 2A Triple Synchronous Buck Regulator

MIC23451
3MHz, 2A Triple Synchronous
Buck Regulator with
HyperLight Load^® and Power Good
General Description
The MIC23451 is a high-efficiency, 3MHz, triple 2A,
synchronous buck regulator with HyperLight Load^® mode.
HyperLight Load provides very-high efficiency at light
loads and ultra-fast transient response, which is ideal 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. The 4mm x 4mm QFN package
saves board space and requires only five external
components for each channel.
The MIC23451 is designed for use with a very small
inductor, down to 0.47µH, and an output capacitor as small
as 2.2µF that enables a total solution size that is less than
1mm height.
The MIC23451 has a very-low quiescent current of 24µA
each channel and achieves as high as 81% efficiency at
1mA. At higher loads, the MIC23451 provides a constant
switching frequency around 3MHz while achieving peak
efficiencies up to 93%.
The MIC23451 is available in a 26-pin 4mm x 4mm QFN
package with an operating junction temperature range
from –40°C to +125°C.
Datasheets and support documentation are available on
Micrel’s web site at: www.micrel.com.
Features
• 2.7V to 5.5V input voltage
• Three independent 2A outputs
• Up to 93% peak efficiency
• 81% typical efficiency at 1mA
• Three independent power good indicators
• 24µA typical quiescent current (per channel)
• 3MHz PWM operation in continuous mode
• Ultra-fast transient response
• Low voltage output ripple
− 30mV_PP ripple in HyperLight Load mode
− 5mV output voltage ripple in full PWM mode
• Fully integrated MOSFET switches
• 0.1µA shutdown current (per channel)
• Thermal-shutdown and current-limit protection
• Output voltage as low as 1V
• 26-pin 4mm × 4mm QFN
• –40°C to +125°C junction temperature range
Applications
• Solid state drives (SSD)
• µC/µP, FPGA, and DSP power
• Test and measurement systems
• Set-top boxes and DTV
• High-performance servers
• Security/surveillance cameras
• 5V POL applications
Typical Application
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
November 5, 2013
Revision 1.2