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Fujitsu MB3878 manual Processing Without USE of the CS PIN, Vcco OUT VIN Batt

Models: MB3878

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MB3878

■PROCESSING WITHOUT USE OF THE CS PIN

If the soft-start function is not used, the CS terminal (pin 22) should be left open.

Open

CS 22

When no soft-start time is specified.

■NOTE ON AN EXTERNAL REVERSE-CURRENT PREVENTIVE DIODE

•Insert a reverse-current preventive diode at one of the three locations marked * to prevent reverse current from the battery.

•When selecting the reverse current prevention diode, be sure to consider the reverse voltage (VR) and reverse current (IR) of the diode.

VCC(O)

21

OUT

20

VH 19

VIN

∗

	A B
∗	I1	BATT
	RS	BATT
	RS
	∗
	Battery

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Fujitsu MB3878 manual Processing Without USE of the CS PIN, Vcco OUT VIN Batt

Contents

Description FeaturesPackage PIN Assignment TOP ViewPin No Symbol Descriptions PIN DescriptionBlock Diagram Parameter Symbol Conditions Rating Unit Min Max Absolute Maximum RagingsRecommended Operating Conditions ParameterElectrical Characteristics Parameter Symbol Pin Conditions Value Unit Min TypParameter Symbol Pin Conditions Value Unit Min Typ Max Outd = 1 mA 100 On resistor200 Amplifier block Output source Typical Characteristics Triangular wave oscillator Deg Functional Description PWM comparator block PWM Comp Output block OUTControl block CTL Bias voltage block VHSetting the Charging Voltage Method of Setting the Charging CurrentMethod of Setting the SOFT-START Time Method of Setting the Triangular Wave Oscillator FrequencyOperation Timing Diagram AC Adaptor Voltage DetectionProcessing Without USE of the CS PIN Vcco OUT VIN BattApplication Example OUTC2Parts No Reference Data BattVCC Vishay Siliconix Usage Precautions Ordering InformationPart number Package Remarks MB3878PFVPackage Dimension IndexFujitsu Limited