Microchip Technology MIC2238-S4YML-TR

Description
The MIC2238 is a dual-output, 2-phase synchronous buck (step-down) PWM DC/DC switching regulator. It offers high power conversion efficiencies (above 95%) for various applications and loads. With an ultra-low quiescent current of 28μA at light loads, it minimizes current draw in battery-powered devices requiring standby modes. The 2.5MHz PWM operation enables the use of miniature inductors (1µH, 2.2pH, or 4.7uH) and a 2.2uF ceramic output capacitor.
The MIC2238 operates within an input voltage range of 2.5V to 5.5V. Fixed output voltage versions are available to save space and reduce external components. The adjustable version (MIC2238-AA) allows output voltage programming as low as 0.8V.
For applications demanding low noise performance, the /FPWM pin disables the automatic Trickle mode, maintaining full PWM operation. To extend battery life in low-dropout conditions, the MIC2238 can operate with a maximum duty cycle of 100%.

Features
Input voltage range: 2.5V to 5.5V
Dual output voltages running out of phase
28μA quiescent current
Fixed output voltage versions
Adjustable version down to 0.8V
Low noise 2.5MHz PWM operation
800mA output current capability for each channel
Stable with 2.2μH inductor, 2.2uF ceramic cap
Automatic switching into light load mode of operation
/FPWM pin allows low noise all-PWM mode operation
Power good output with internal 5μA current source for sequencing with programmable delay time
Internal soft-start
1μA shutdown current
Built-in soft-start circuitry
Current limit protection
Pb-Free 3mm x 3mm MLF®-12L package

Applications
Cellular phones
PDAs
Digital cameras
MP3 players