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MB3886 Dataheets PDF



Part Number MB3886
Manufacturers Fujitsu Media Devices
Logo Fujitsu Media Devices
Description 2-Channel DC/DC Converter IC
Datasheet MB3886 DatasheetMB3886 Datasheet (PDF)

www.DataSheet4U.com FUJITSU SEMICONDUCTOR DATA SHEET DS04-27228-2E ASSP For Power Supply Applications (General Purpose DC/DC Converter) 2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type MB3886 s DESCRIPTION The MB3886 is a symmetrical-phase type of two-channel, DC/DC converter IC using pulse width modulation (PWM) , incorporating an overcurrent protection circuit (requiring no current sense resistor) and an overvoltage protection circuit. Providing high output .

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www.DataSheet4U.com FUJITSU SEMICONDUCTOR DATA SHEET DS04-27228-2E ASSP For Power Supply Applications (General Purpose DC/DC Converter) 2-Channel DC/DC Converter IC with Overcurrent Protection Symmetrical-Phase Type MB3886 s DESCRIPTION The MB3886 is a symmetrical-phase type of two-channel, DC/DC converter IC using pulse width modulation (PWM) , incorporating an overcurrent protection circuit (requiring no current sense resistor) and an overvoltage protection circuit. Providing high output driving capabilities, the MB3886 is suitable for down-conversion. The MB3886 adopts both synchronous rectification to provide high efficiency and symmetrical phasing (two antiphase triangular waves) which contributes to making the input capacitor small. The MB3886 contains a 5-volt regulator resulting in a reduced number of components used. It also contains a variety of protection features which output the protection status upon detection of an overvoltage or overcurrent while reducing the number of external protective devices required. 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. This product is covered by US Patent Number 6,147,477. s FEATURES • • • • Overcurrent protection circuit (requiring no current sense resistor) and overvoltage protection circuit Power-supply voltage range : 5.5 V to 18 V Synchronous rectification system providing high efficiency PSIG pins (open-drain) to output the protection status (Continued) s PACKAGE 30-pin plastic SSOP (FPT-30P-M02) MB3886 (Continued) • Symmetrical-phase system reducing the input capacitor loss • Built-in channel control function • Reference voltage : 3.5 V ± 1% • Error amplifier threshold voltage : 1.25 V ± 1% (0 °C to 85 °C) • Oscillator frequency range : 10 kHz to 500 kHz • Built-in circuit for load-independent soft-start and discharge control • Totem-pole type output for N-ch MOSFET s PIN ASSIGNMENT (TOP VIEW) PSIG1 : 1 CTL1 : 2 ILIM1 : 3 CT : 4 RT : 5 SGND : 6 CS1 : 7 −INE1 : 8 FB1 : 9 +INC1 : 10 OUT1-1 : 11 VS1 : 12 CB1 : 13 OUT2-1 : 14 PGND : 15 30 : PSIG2 29 : CTL2 28 : ILIM2 27 : VREF 26 : VCC 25 : CSCP 24 : CS2 23 : −INE2 22 : FB2 21 : +INC2 20 : OUT1-2 19 : VS2 18 : CB2 17 : OUT2-2 16 : VB (FPT-30P-M02) 2 MB3886 s PIN DESCRIPTION Pin No. Pin name I/O 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 PSIG1 CTL1 ILIM1 CT RT SGND CS1 −INE1 FB1 +INC1 OUT1-1 VS1 CB1 OUT2-1 PGND VB OUT2-2 CB2 VS2 OUT1-2 +INC2 FB2 −INE2 CS2 CSCP VCC VREF ILIM2 CTL2 PSIG2 O I I Description CH1 protection status output terminal CH1 control terminal “H” level : CH1 ON state “L” level : CH1 OFF state and protection status reset CH1 overcurrent detection resistor connection terminal  Triangular waveform oscillation frequency setting capacitor connection terminal  Triangular waveform oscillation frequency setting resistor connection terminal  Ground terminal  CH1 soft-start capacitor connection terminal I O I O CH1 error amp. inverting input terminal CH1 error amp. output terminal CH1 overvoltage comparator noninverting input terminal CH1 totem-pole output terminal (External main-side FET gate drive) CH1 boot capacitor connection terminal Connect a capacitor between the CB1 and VS1 terminals. CH1 totem-pole output terminal (External synchronous-rectification-side FET gate drive) Output circuit bias output terminal CH2 totem-pole output terminal (External synchronous-rectification-side FET gate drive) CH2 boot capacitor connection terminal Connect a capacitor between the CB2 and VS2 terminals. CH2 totem-pole output terminal (External main-side FET gate drive) CH2 error amp. output terminal CH2 error amp. inverting input terminal  CH1 external main-side FET source connection terminal  O  Ground terminal O O   CH2 external main-side FET source connection terminal O O I  CH2 overvoltage comparator noninverting input terminal  CH2 soft-start capacitor connection terminal  Timer-latch short-circuit protection capacitor connection terminal  Reference voltage, control circuit power supply terminal O I I O Reference voltage output terminal CH2 overcurrent detection resistor connection terminal CH2 control terminal “H” level : CH2 ON state “L” level : CH2 OFF state and protection status reset CH2 protection status output terminal 3 MB3886 s BLOCK DIAGRAM VCC 26 5 V Reg. FB1 9 −INE1 8 CS1 7 VREF 10 µA +INC1 10 CTL1 2 1.47 V CTL1 3.8 kΩ 16 VB 10 µA < CH1 > Error Amp.1 − + + 1.25 V OVP Comp.1 + − Latch1-1 13 CB1 PWM Comp.1 + − Drive1-1 11 OUT1-1 12 VS1 R SQ Dead Time Modulation1 Latch2-1 Drive2-1 14 OUT2-1 CTL1 R QS Current Protection Logic PSIG1 1 − + 3 ILIM1 FB2 22 10 µA < CH2 > Error Amp.2 − + + 18 CB2 PWM Comp.2 + − Drive1-2 −INE2 23 CS2 24 VREF 10 µA +INC2 21 CTL2 29 3.8 kΩ 1.25 V OVP Comp.2 + − Latch1-2 20 OUT1-2 19 VS2 1.47 V CTL2 R Dead Time Modulation2 Latch2-2 Drive2-2 17 OUT2-2 15 PGND SQ PSIG2 30 CTL2 Current Protec.


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