STW41417T

更新时间： 2024-11-25 04:01:39

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		转换器
页数	文件大小	规格书
30页	866K
描述
Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply

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中文翻译

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STW41417T 数据手册

STw4141

Single-coil dual-output step-down DC/DC converter

for digital base band and multimedia processor supply

Features

Solution size

7 x 8 mm

■ 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

TFBGA 3x3mm

16 bumps 0.5 mm pitch

■ Wide range of fixed output voltage

configurations available

Applications

■ High efficiency synchronous step down

converter with up to 92 % for the entire device

■ Mobile phones

■ Size and cost optimized application board

(7x8 mm, height 1.2mm) three capacitors and

only one inductor necessary for both outputs

■ PDAs and hand held terminals

■ Portable media players

■ Digital still camera

■ 2.7 V to 5.5 V battery input range

■ WLAN and Bluetooth applications

■ ±100mV output voltage accuracy full range in

PWM (Including Line and Load Transients)

Description

■ 900 kHz fixed frequency PWM operation

■ PFM mode operation at light load current

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.

■ 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

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).

■ VSEL input pin for V_OUT2/V_OUT2(red.)selection

■ Ultra low shutdown current (Iq<1 µA)

■ Short circuit and thermal shutdown protections

Application test circuit

4.7 µH

VLX1

VLX2

V_IN=2.7V to 5.5V

V_OUT1=1.8V

PVDD

VDD

VOUT1

FB1

C_IN

10 µF

6.3 V

C_OUT1

22 µF

6.3 V

V_OUT2=1.0V/1.2V

AUTO

VOUT2

FB2

STw4141

VSEL

C_OUT2

22 µF

6.3 V

MODE/SYNC

STATE

T_MODE

PGND GND

June 2006

Rev 2

1/30

www.st.com

12 3 4 5 6 7...30

中文翻译

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