MIC23254
4MHz Dual 400mA Synchronous Buck
Regulator with Low Input Voltage and
HyperLight Loadв„ў General Description Features The MIC23254 is a low-input voltage, high-efficiency 4MHz Low input voltage range: 2.5V to 5.5V
dual 400mA synchronous buck regulator with HyperLight Dual output current 400mA/400mA
Loadв„ў mode. HyperLight Loadв„ў provides very-high Up to 94% peak efficiency and 85% efficiency at 1mA
efficiency at light loads and ultra-fast transient response 33ВµA dual quiescent current
which is perfectly suited for supplying processor core 1ВµH inductor with a 4.7ВµF capacitor
voltages. An additional benefit of this proprietary 4MHz in PWM operation
architecture is very-low output ripple voltage throughout
the entire load range with the use of small output Ultra-fast transient response
capacitors. MIC23254 operates from an input voltage Low voltage output ripple
down to 2.5V for low battery states. The MIC23254 has a 20mVpp in HyperLight Loadв„ў mode
В®
tiny 2mm x 2mm Thin MLF package that saves precious 3mV output voltage ripple in full PWM mode
board space by requiring only 6 additional external 0.01ВµA shutdown current
components to drive both outputs up to 400mA each. Fixed output:10-pin 2mm x 2mm Thin MLFВ®
The device is designed for use with a 1µH inductor and a –40°C to +125°C junction temperature range
4.7ВµF output capacitor that enables a sub-1mm height.
The MIC23254 has a very-low quiescent current of 33ВµA
with both outputs enabled and can achieve over 85%
Applications
efficiency at 1mA. At higher loads the MIC23254 provides a Mobile handsets …