MB3875 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. These ICs 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 enables quick charging,...
MB3875 Key Features
- Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled chargi
- 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 % (Continued)
- 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 µA (Typ.)
- On-chip soft start function
- Internal totem-pole output stage supporting P-channel MOS FETs devices
MB3875 Applications
- Detecting a voltage drop in the AC adapter and dynamically controlling the charge current (Dynamically-controlled charging)