MB3885

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27227-1E ASSP For Power Management Applications 1-channel DC/DC Converter IC with Synchronous Rectifier MB3885 s DESCRIPTION The MB3885 is a 1-channel DC/DC converter IC using pulse width modulation (PWM) and synchronous rectification, designed for down conversion applications. This device is a power supply with high output drive capacity. Synchronous rectification also provides for high efficiency. In addition, a 5 V regulator is built in to reduce the number of system components. The result is an ideal built-in power supply for driving products with high speed CPU’s such as home TV game devices and notebook PC’s. s FEATURES Synchronous rectification for high efficiency Supply voltage range : 5.5 V to 18 V Built-in high-precision reference voltage circuit : 2.5 V ± 1% Error Amp. threshold voltage : 1.25 V ± 1% (0 °C to 85 °C) Oscillator frequency range : 10 kHz to 500 kHz Built-in soft start circuit with error Amp. input control Totem pole type output for N-ch MOSFET s PACKAGE 20-pin Plastic SSOP (FPT-20P-M03) MB3885 s PIN ASSIGNMENTS (TOP VIEW) N.C. : 1 N.C. : 2 CSCP : 3 CT : 4 RT : 5 CS : 6 FB : 7 −INE : 8 +INE : 9 VCC : 10 20 : N.C. 19 : N.C. 18 : VREF 17 : SGND 16 : PGND 15 : OUT2 14 : VS 13 : OUT1 12 : CB 11 : VB (FPT-20P-M03) 2 MB3885 s PIN DESCRIPTIONS Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Symbol N.C. N.C. CSCP CT RT CS FB −INE +INC VCC VB CB OUT1 VS OUT2 PGND SGND VREF N.C. N.C. I/...