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STW41415 bảng dữ liệu(PDF) 2 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  Single-coil dual-output step-down DC/DC converter for digital base band and multimedia processor supply
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STW41415 bảng dữ liệu(HTML) 2 Page - STMicroelectronics

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June 2006
Rev 2
1/30
1
STw4141
Single-coil dual-output step-down DC/DC converter
for digital base band and multimedia processor supply
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
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
TFBGA 3x3mm
16 bumps 0.5 mm pitch
Solution size
7 x 8 mm
VOUT1
FB1
V
OUT1=1.8V
C
OUT1
22 µF
6.3 V
VOUT2
FB2
V
OUT2=1.0V/1.2V
C
OUT2
22 µF
6.3 V
PVDD
V
IN=2.7V to 5.5V
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
AUTO
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
VOUT1
FB1
V
OUT1=1.8V
C
OUT1
22 µF
6.3 V
VOUT2
FB2
V
OUT2=1.0V/1.2V
C
OUT2
22 µF
6.3 V
PVDD
V
IN=2.7V to 5.5V
C
IN
10 µF
6.3 V
PGND
VDD
EN
VLX1
VLX2
GND
MODE/SYNC
T_MODE
AUTO
L 4.7 µH
STw4141
VSEL
STATE
B1
D3
D4
C2
C3
C1
A4
D1
B4
D2
B2
A2
A3
A1
B3
C4
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