MB39A132 PDF – Rectification DC/DC Converter IC

The Part Number is MB39A132.

The function of this semiconductor is Synchronous Rectification DC/DC Converter IC.

The packkage is QFN 32 Pin Type

Manufacturer: Fujitsu

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MB39A132 pdf


MB39A132, which is used for charging Li-ion battery, is a synchronous rectification DC/DC converter IC adopting pulse width modification (PWM). It can control charge voltage and charge current separately and supports the N-ch MOS driver. In addition, MB39A132 is suitable for down-conversion.

MB39A132 has an AC adapter detection comparator, which is independent of the DC/DC converter control block, and can control the source supplying voltage to the system.

MB39A132 supports a wide input voltage range, enables low current consumption in standby mode, and can control the charge voltage and charge current with high precision, which is perfect for the built-in Li-ion battery charger used in devices such as notebook PC. […]


• Supports 2/3/4-Cell battery pack
• Two built-in constant current control loops
• Built-in AC adapter detection function (ACOK pin)
• Charge current control setting can be selected without using any external resistor. (RS = 20 mΩ: 2.85 A) Charge current can also be freely set by using the external resistor.
• Switching frequency can be set by using the external resistor (MB39A132 has a built-in frequency setting capacitor.):100 kHz to 2 MHz
• Built-in off time control function

• Internal charger used in notebook PC
• Handy terminal device

MB39A132 pinout datasheet

MB39A132 PDF Datasheet