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STW41412T Datasheet(PDF) 1 Page - STMicroelectronics |
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STW41412T Datasheet(HTML) 1 Page - STMicroelectronics |
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1 / 30 page  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 www.st.com |
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