General Description
The MIC23451 is a high-efficiency, 3 MHz, 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
4 mm x 4 mm FQFN 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 0.47 μH, and an output capacitor as
small as 2.2 μF that enables a total solution size that is
less than 1 mm height.
The MIC23451 has a very low quiescent current of
24 μA each channel and achieves as high as 81%
efficiency at 1 mA. At higher loads, the MIC23451
provides a constant switching frequency around 3 MHz
while achieving peak efficiencies up to 93%.
The MIC23451 is available in a 26-lead 4 mm x 4 mm
FQFN package with an operating junction temperature
range from –40°C to +125°C.

Features
• 2.7V to 5.5V Input Voltage
• Three Independent 2A Outputs
• Up to 93% Peak Efficiency
• 81% Typical Efficiency at 1 mA
• Three Independent Power Good Indicators
• 24 μA Typical Quiescent Current (per Channel)
• 3 MHz PWM Operation in Continuous Mode
• Ultra-Fast Transient Response
• Low Voltage Output Ripple
- 30 mVPP Ripple in HyperLight Load Mode
- 5 mV Output Voltage Ripple in Full PWM Mode
• Fully Integrated MOSFET Switches
• 0.1 μA Shutdown Current (per Channel)
• Thermal Shutdown and Current-Limit Protection
• Output Voltage as Low as 1V
• 26-Lead 4 mm × 4 mm FQFN
• –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