Fujitsu MB3887 manual

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MB3887

(Continued)
• Output voltage setting using external resistor	: 1 cell to 4 cells
• High efficiency	: 96% (VIN = 19 V, Vo = 16.8 V)
• Wide range of operating supply voltages	: 8 V to 25 V
• Output voltage setting accuracy	: 4.2 V ± 0.74% (Ta = −10 °C to +85 °C , per cell)
• Charging current accuracy	: ±5%
• Built-in frequency setting capacitor enables frequency setting using external resistor only
• Oscillation frequency range	: 100 kHz to 500 kHz

•Built-in current detection amplifier with wide in-phase input voltage range : 0 V to VCC

•In standby mode, leave output voltage setting resistor open to prevent inefficient current loss

• Built-in standby current function

: 0 ∝A (standard)

•Built-in soft-start function independent of loads

•Built-in totem-pole output stage supporting P-channel MOS FET devices

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Contents Package FeaturesDescription MB3887 PIN Assignment TOP ViewPin No Symbol Descriptions PIN DescriptionBlock Diagram Parameter Symbol Conditions Rating Unit Min Max Absolute Maximum RatingsParameter Symbol Conditions Value Unit Min Typ Recommended Operating ConditionsBol 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 Output block OUT PowerPWM comparator block PWM Comp Control block CTLMethod of Setting the Triangular Wave Oscillation Frequency Setting the Charging VoltageMethod of Setting the Charging Current Soft-start block SoftMethod of Setting the SOFT-START Time Operation Timing Diagram AC Adaptor Voltage DetectionProcessing Without Using the Current AMP Connection when Current Amp is not usedProcessing Without Using of the Error AMP Connection when Error Amp is not usedProcessing Without Using of the CS Terminal Connection when soft-start time is not specifiedApplication Example At 4 cellParts List Parts NoReference Data Batt Vbatt mV Ta = +25 C, VIN = 19 Batt = 12 Ω Part number Package Remarks Usage PrecautionsOrdering Information Package Dimension IndexFujitsu Limited