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STw4141| Datasheet

By datasheet - April 3rd, 2008

STw4141| Datasheet

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STw4141
Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply
Data Brief

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 uA) Short circuit and thermal shutdown protections

Solution size 7 x 8 mm

TFBGA 3x3mm 16 bumps 0.5 mm pitch

Applications

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

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).

Application test circuit
L 4.7 uH VLX1 VIN=2.7V to 5.5V CIN 10 uF 6.3 V PVDD
B1 A2

VLX2
A3 A4 D1

VOUT1 FB1 COUT1 22 uF 6.3 V

VOUT1=1.8V

VDD
D3

EN AUTO

D4 C2

STw4141

B4 D2 B2 B3

VOUT2 FB2 STATE COUT2 22 uF 6.3 V

VOUT2=1.0V/1.2V

VSEL MODE/SYNC

C3 C1

A1

C4

PGND GND

T_MODE

May 2006

Rev 2

1/4
www.st.com
1

For further information contact your local STMicroelectronics sales office.


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