Pentium II DC/DC Converter
FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27218-4E
ASSP For Power Supply Applications
Pentium® II DC/DC Converter IC
MB3...
Description
FUJITSU SEMICONDUCTOR DATA SHEET
DS04-27218-4E
ASSP For Power Supply Applications
Pentium® II DC/DC Converter IC
MB3870
s DESCRIPTION
The FUJITSU MB3870 is a pulse width modulation (PWM) DC/DC converter IC chip that provides a selection of 1.3 V to 3.5 V output voltages for Pentium®* CPU’s, using a 5-bit input signal information. The MB3870 utilizes synchronous rectification for high efficiency and features a soft-start/discharge control function for ease in designing power supplies in multi-supply systems, making it ideal for Pentium® II power supply systems. * : Pentium is the registered trademark of Intel Corporation.
s FEATURES
Highly efficient for using synchronous rectification scheme On-chip soft-start/discharge control circuit High precision output voltage: ±1.2% 5-bit, 32-step DAC: 3.5 V to 2.1 V in 100 mV steps 2.05 V to 1.3 V in 50 mV steps Frequency range: 100 kHz to 500 kHz using variable resistance (on-chip frequency setting capacitance) Standby current: 0 µA TYP On-chip PWRGOOD circuit for output voltage state detection Timer-latch short-circuit protection circuit, and overvoltage protection circuit for output protection
s PACKAGE
24-pin Plastic SSOP
(FPT-24P-M03)
MB3870
s PIN ASSIGNMENT
(Top view)
RT : 1 RS : 2 SGND : 3 CS : 4 –IN : 5 FB : 6 ENB : 7 OUT1 : 8 VS : 9 CB : 10 OUT2 : 11 PGND : 12
24 : VREF 23 : VCC 22 : CSCP 21 : PWRGOOD 20 : VSENSE 19 : CTL 18 : VD4 17 : VD3 16 : VD2 15 : VD1 14 : VD0 13 : VB
(FPT-24P-M03)
2
MB3870
s...
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