MIC23450_13 Datasheet, PDF (1/22 Pages) Micrel Semiconductor – 3MHz, PWM, 2A Triple Buck Regulator with HyperLight Load® and Power Good

MIC23450
3MHz, PWM, 2A Triple Buck Regulator
with HyperLight Load^® and Power Good
General Description
The MIC23450 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 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. The 5mm x 5mm QFN package
saves board space and requires only five external
components for each channel.
The MIC23450 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, less than 1mm
height.
The MIC23450 has a very-low quiescent current of 23µA
each channel and achieves as high as 81% efficiency at
1mA. At higher loads, the MIC23450 provides a constant
switching frequency around 3MHz while achieving peak
efficiencies up to 93%.
The MIC23450 is available in 32-pin 5mm x 5mm QFN
package with an operating junction temperature range
from –40°C to +125°C.
Datasheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Features
• Input voltage: 2.7V to 5.5V
• 3 independent 2A outputs
• Up to 93% peak efficiency
• 81% typical efficiency at 1mA
• Three independent Power Good Indicators
• 23µA 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
• 0.01µA shutdown current (per channel)
• Thermal-shutdown and current-limit protection
• Output voltage as low as 1V
• 32-pin 5mm x 5mm 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
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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
110513-1.1