MB3878 Overview
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. These ICs 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 enables quick charging,...
MB3878 Key Features
- Detecting a voltage drop in the AC adaptor and dynamically controlling the charge current (Dynamically-controlled chargi
- 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 µA (standard)
MB3878 Applications
- 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