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MB3878

Features: • Detecting a voltage drop in the AC adaptor and dynamically controlling the charge current(Dynamically-controlled charging)• Output voltage setting using external resistor : 1 cell to 4 cells• High efficiency : 94 %• Wide range of operating supply voltages: 7 V t...

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SeekIC No. : 004413310 Detail

MB3878: Features: • Detecting a voltage drop in the AC adaptor and dynamically controlling the charge current(Dynamically-controlled charging)• Output voltage setting using external resistor : 1...

MB3878 Data Sheet

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Part Number:
MB3878
Supply Ability:
5000

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  • 1~5000
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  • Processing time
  • 15 Days
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Product Details

Description



Features:

• Detecting a voltage drop in the AC adaptor and dynamically controlling the charge current
(Dynamically-controlled charging)
• Output voltage setting using external resistor : 1 cell to 4 cells
• High efficiency : 94 %
• Wide range of operating supply voltages         : 7 V to 25 V
• Output voltage setting accuracy                       : 4.2V ± 0.8% (per cell)
• Built-in frequency setting capacitor enables frequency setting using external resistor only
• Oscillator frequency range                               : 100kHz to 500kHz
• Built-in current detector 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
• Built-in totem-pole output stage supporting P-channel MOS FETs devices


Pinout

Connection Diagram


Specifications

Parameter Symbol Conditions Rating 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 MB3878 is a DC/DC converter IC suitable for down-conversion, using pulse-width (PWM) charging and enabling output voltage to be set to any desired level from one cell to four cells.

The MB3878 can dynamically control the secondary battery's charge current by detecting a voltage drop in an AC adaptor in order to keep its power constant (dynamically-controlled charging).

The charging method of MB3878enables quick charging, for example, with the AC adaptor during operation of a notebook PC.

The MB3878 provides a broad power supply voltage range and low standby current as well as high efficiency, making it ideal for use as a built-in charging device in products such as notebook PC.




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