Description
The STw4141 is a single coil dual output synchronous step down DC/DC converter that requires only four standard external components. It operates at a fixed 900 kHz switching frequency in PWM mode. The device can operate in PFM mode to maintain high efficiency over the full range of output currents.
The STw4141 application requires a very small PCB area and offers a very efficient, accurate, space and cost saving solution to fulfill the requirements of digital baseband or multimedia processor supply (CORE & I/O).

FEATUREs
■ Single coil dual output switching converter for
   digital core supply & digital I/Os supply
   – Digital I/O supply:VOUT1 @ 200 mA
   – CPU CORE supply:VOUT2 @ 400 mA
■ Wide range of fixed output voltage
   configurations available
■ High efficiency synchronous step down
   converter with up to 92 % for the entire device
■ Size and cost optimized application board
   (7x8 mm, height 1.2mm) three capacitors and
   only one inductor necessary for both outputs
■ 2.7 V to 5.5 V battery input range
■ ±100mV output voltage accuracy full range in
   PWM (Including Line and Load Transients)
■ 900 kHz fixed frequency PWM operation
■ PFM mode operation at light load current
■ PWM/PFM switch can be done automatically or
   forced by setting external pins (AUTO and
   MODE/SYNC)
■ MODE/SYNC input pin for external clock
   synchronization from 600 kHz to 1.5 MHz
■ VSEL input pin for VOUT2/VOUT2(red.) selection
■ Ultra low shutdown current (Iq<1 µA)
■ Short circuit and thermal shutdown protections

APPLICATIONs
■ Mobile phones
■ PDAs and hand held terminals
■ Portable media players
■ Digital still camera
■ WLAN and Bluetooth applications