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Fujitsu MB39A104 manual Description, Features, Package, Fujitsu Semiconductor Data Sheet

Models: MB39A104

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FUJITSU SEMICONDUCTOR

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

■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.

■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 ∝A (Typ)

•Built-in soft-start circuit independent of loads

•Built-in totem-pole type output for Pch MOS FET

■PACKAGE

24-pin plastic SSOP

(FPT-24P-M03)

Image 1

Fujitsu MB39A104 manual Description, Features, Package, Fujitsu Semiconductor Data Sheet, ch DC/DC Converter IC

Contents

FUJITSU SEMICONDUCTOR DATA SHEET FEATURESDESCRIPTION PACKAGEPIN ASSIGNMENTS MB39A104Symbol PIN DESCRIPTIONMB39A104 Pin NoMB39A104 BLOCK DIAGRAMbias 1.24RECOMMENDED OPERATING CONDITIONS ABSOLUTE MAXIMUM RATINGSSymbol SymbolMB39A104 ELECTRICAL CHARACTERISTICSParameter Pin NoMB39A104 SymbolContinued ParameterMB39A104 TYPICAL CHARACTERISTICSICCmA VREFVMB39A104 Triangular Wave Oscillation Frequency vs. Ambient Temperaturevs. Timing Resistor ContinuedPower Dissipation vs. Ambient Temperature Error Amplifier, Gain, Phase vs. FrequencyMB39A104 Continued1. DC/DC Converter Functions FUNCTIONS3 Error amplifier block Error Amp1, Error Amp2 MB39A1043. Protective Functions 2. Control Function1 Timer-latch overcurrent protection circuit block OCP 2 Timer-latch short-circuit protection circuit SCP Logic, SCP CompSETTING THE TRIANGULAR OSCILLATION FREQUENCY SETTING THE OUTPUT VOLTAGEMB39A104 MB39A104 SETTING THE SOFT-START AND DISCHARGE TIMESMB39A104 CH ON/OFF signalL priority L ON, H OFFWithout Setting Soft-Start Time TREATMENT WITHOUT USING CS TERMINALMB39A104 1. Setting Timer-Latch Overcurrent Protection Detection Current ABOUT TIMER-LATCH PROTECTION CIRCUITMB39A104 MB39A104 Method to detect by current when external FETQ1 is turned onOvercurrent Detection Function Operating Range Overcurrent Protection Circuit Range of OperationMB39A104 Timer-latch short-circuit protection circuitRESETTING THE LATCH OF EACH PROTECTION CIRCUIT TREATMENT WITHOUT USING CSCP TERMINALTreatment without using CSCP MB39A104MB39A104 I/O EQUIVALENT CIRCUITL OFF Standby mode H ON Power ONMB39A104 V TH = 1.4MB39A104 PARTS LISTMB39A104 SELECTION OF COMPONENTSPch MOS FET MB39A104 Inductors MB39A104IO ≥ MB39A104MB39A104 Flyback diode MB39A104Smoothing Capacitor MB39A1042 π ⋅ 500 ⋅ 10 3 ⋅ 82 ⋅ 10 − ⋅ 10 MB39A1042 π ⋅ 500 ⋅ 10 3 ⋅ 0.050 − 0.491 ⋅ 2 π ⋅ 500 ⋅ 10 3 ⋅ 0.033 − 0.364 ⋅MB39A104 REFERENCE DATAContinued 10 mSwitching Wave Form CH2 Switching Wave Form CH1MB39A104 ContinuedORDERING INFORMATION USAGE PRECAUTIONMB39A104 Take appropriate static electricity measuresMB39A104 PACKAGE DIMENSIONSMB39A104 FUJITSU LIMITEDF0308  FUJITSU LIMITED Printed in Japan