MB39A104 Datasheet | Fujitsu Semiconductor Limited

FUJITSU SEMICONDUCTOR DATA SHEET DS04-27231-3E ASSP For Power Management Applications (General Purpose DC/DC Converter) 2-ch DC/DC Converter IC with Overcurrent Protection MB39A104 s DESCRIPTION The MB39A104 is a 2-channel DC/DC converter IC using pulse width modulation (PWM), incorporating an overcurrent protection circuit (requiring no current sense resistor). This IC is ideal for down conversion. Operating at high frequency reduces the value of coil. This is ideal for built-in power supply such as LCD monitors and ADSL. This product is covered by US Patent Number 6,147,477. s Features - - - - - - - - Built-in timer-latch overcurrent protection circuit (requiring no current sense resistor) Power supply voltage range : 7 V to 19 V Reference voltage : 5.0 V ± 1 % Error amplifier threshold voltage : 1.24 V ± 1 % High-frequency operation capability : 1.5 MHz (Max) Built-in standby function: 0 µA (Typ) Built-in soft-start circuit independent of loads Built-in totem-pole type output for Pch MOS FET s PACKAGE 24-pin plastic SSOP (FPT-24P-M03) .. .. MB39A104 s PIN ASSIGNMENTS (TOP VIEW) VCCO : 1 VH : 2 OUT1 : 3 VS1 : 4 ILIM1 : 5 DTC1 : 6 VCC : 7 CSCP : 8 FB1 : 9 - INE1 : 10 CS1 : 11 RT : 12 24 : CTL 23 : GNDO 22 : OUT2 21 : VS2 20 : ILIM2 19 : DTC2 18 : GND 17 : VREF 16 : FB2 15 : - INE2 14 : CS2 13 : CT (FPT-24P-M03) MB39A104 s PIN DESCRIPTION Pin No. 1 2 3 4 5 Symbol VCCO VH OUT1 VS1 ILIM1 I/O  O O I I Descriptions Output circuit power supply terminal (Connect to same potential as VCC pin.) Power supply terminal for FET drive circuit (VH = VCC - 5 V) External Pch MOS FET gate drive terminal Overcurrent protection circuit input terminal Overcurrent protection circuit detection resistor connection terminal. Set overcurrent detection reference voltage depending on external resistor and internal current resource (110 µA at RT = 24 kΩ) PWM parator block (PWM) input terminal. pares the lowest voltage among FB1 and DTC...