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MB3877

Features: • Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled charging)• High efficiency : 95 %• Wide range of operating supply voltages: 7 V to 25 V• Output voltage precision (Output voltage setting resistor i...

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SeekIC No. : 004413309 Detail

MB3877: Features: • Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled charging)• High efficiency : 95 %• Wide range of opera...

MB3877 Data Sheet

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Part Number:
MB3877
Supply Ability:
5000

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Product Details

Description



Features:

• Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled
   charging)
• High efficiency                                                                                       : 95 %
• Wide range of operating supply voltages                                             : 7 V to 25 V
• Output voltage precision (Output voltage setting resistor integrated) : 0 ± 0.8 % (Ta = + 25 °C)
• High precision reference voltage source                                               : 4.2 V ± 0.8 %
• Support for frequency setting using an external resistor
  (Frequency setting capacitor integrated) :100 kHz to 500 kHz
• On-chip current detector amplifier with wide in-phase input voltage range : 0 V to VCC
• On-chip standby current function                                                                 : 0 A (Typ.)
• On-chip soft start function
• Internal totem-pole output stage supporting P-channel MOS FETs devices


Pinout

Connection Diagram


Specifications

Parameter Symbol Conditions   Unit
Min. Max.
Power supply voltage VCC VCC,VCC(O) - 28 V
Output current IOUT - - 60 mA
Peak output current IOUT Duty 5% (t =1 / fOSC*Duty) - 500 mA
Power dissipation PD Ta +25 °C - 740* mW
Storage temperature Tstg - -55 +125 °C
*: The package is mounted on the dual-sided epoxy board (10 cm *10 cm).
WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,
temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.


Description

The MB3875 and MB3877 are charging DC/DC converter ICs suitable for down-conversion, which uses pulse width modulation (PWM) for controlling the output voltage and current independently.

The MB3877 can dynamically control the secondary battery's charge current by detecting a voltage drop in an AC adapter in order to keep its power constant (dynamically-controlled charging).

The charging method of MB3877 enables quick charging, for example, with the AC adapter during operation of a notebook PC.

With an on-chip output voltage setting resistor which allows the output voltage to be set at high precision, the MB3877 is best suited as internal battery chargers for notebook PCs.

The MB3875 and MB3877 support 3-cell and 4-cell batteries, respectively.




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