Processing Without Using of the CS Terminal | Fujitsu MB3887

MB3887

■PROCESSING WITHOUT USING OF THE CS TERMINAL

When soft-start function is not used, leave the CS terminal (pin 22) open.

“Open”

CS 22

Connection when soft-start time is not 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

23

Image 23

Fujitsu MB3887 manual Processing Without Using of the CS Terminal, Connection when soft-start time is not specified

Contents

Package FeaturesDescription MB3887 TOP View PIN Assignment PIN Description Pin No Symbol Descriptions Block Diagram Absolute Maximum Ratings Parameter Symbol Conditions Rating Unit Min Max Recommended Operating Conditions Parameter Symbol Conditions Value Unit Min Typ Bol Min Typ Electrical CharacteristicsParameter Sym Pin Conditions Parameter Sym Pin Conditions Value Unit Bol Min Typ Max Parameter Sym Pin Conditions Value Unit Bol Min Typ OUT = −45 mA Output block Resistor Typical Characteristics Triangular wave oscillation frequency fOSC kHz Error amplifier gain and phase vs. Frequency Gain a Power dissipation vs. Ambient temperature Functional Description Control block CTL PowerPWM comparator block PWM Comp Output block OUT Soft-start block Soft Setting the Charging VoltageMethod of Setting the Charging Current Method of Setting the Triangular Wave Oscillation Frequency Method of Setting the SOFT-START Time AC Adaptor Voltage Detection Operation Timing Diagram Connection when Current Amp is not used Processing Without Using the Current AMP Connection when Error Amp is not used Processing Without Using of the Error AMP Connection when soft-start time is not specified Processing Without Using of the CS Terminal At 4 cell Application Example Parts No Parts List Reference Data Batt Vbatt mV Ta = +25 C, VIN = 19 Batt = 12 Ω Part number Package Remarks Usage PrecautionsOrdering Information Index Package Dimension Fujitsu Limited