STw4141

Features:

Single coil dual output switching converter for digital core supply & digital I/Os supply
   Digital I/O supply:V_OUT1 @ 200 mA
   CPU CORE supply:V_OUT2 @ 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 V_OUT2/V_OUT2(red.) selection
Ultra low shutdown current (I_q<1 A)
Short circuit and thermal shutdown protections


Application

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


Specifications

Symbol	Parameter	Value	Unit
PVDD	Power Supply Voltage	-0.3 to 6	V
VDD	Signal Supply Voltage	-0.3 to 6	V
VEN	Enable Input	-0.3 to VDD	V
VSEL	Voltage Selection	-0.3 to VDD	V
VODE/SYNC	Operating Mode Selection/Synchronization Input	-0.3 to VDD	V
VAUTO	PWM/PFM automatic switch selection	-0.3 to VDD	V
VT_MODE	Test mode selection	-0.3 to VDD	V
VSTATE	Operating mode information	-0.3 to VOUT1	V
VOUT1,FB1	Output Voltage 1, Feedback 1	-0.3 to 3.3	V
VOUT2, FB2	Output Voltage 2, Feedback 2	-0.3 to 3.3	V
VLX1	External Inductor Connection Pin 1	-0.3 to VDD	V
VLX2	External Inductor Connection Pin 2	-0.3 to 3.3	V
TA	Operating Temperature Range	-40 to 85	°C
TJ	Maximum Operating Junction Temperature	150	°C
TSTG	Storage Temperature Range	-65 to 150	°C

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).