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For 2Cell Solar, Synchronous Switch-Mode Charger IC - BU1840AMUV

The BU1840AMUV device provides the best system to the product charged with 1cell Li-ion battery and 3cell Nickel-metal-hydride batteries using the 2cell, 3cell, and 4cell solar panel. It is possible to boost it according to the voltage of 2 cell solar panel with built-in the function to boost the low voltage input. Moreover, the solar battery maximum dissipation can be drawn out with built-in the peak power track function. It is possible to select the the switching frequency according to the terminal SEL. It is also possible to monitor the charging current by the I²C interface. Built in heat reckless driving protection (Thermal shutdown), decrease voltage protection, and input current protection for protection function.

* This product is a STANDARD grade product and not recommend for on-vehicle devices.
Part number
Status
Package
Unit Quantity
Minimum Package Quantity
Packing Type
RoHS
BU1840AMUV-E2 Active VQFN024V4040 2500 2500 Taping Yes
 
Specifications:
Grade Standard
Supply Voltage(Min.)[V] 0.625
Supply Voltage(Max.)[V] 1.98
ON Resistance [mΩ] 100
Operating Temperature (Min.)[°C] -30
Operating Temperature (Max.)[°C] 85
Features:
  • ・ Synchronous Switch-Mode Charger for 2Cell Solar 400mA@Battery=3.7V,VIN=1V
    ・ MPPT control voltage range:0.7V~1.5V
    ・ Charging current completion voltage: 5.0V (hysteresis: 0.075V)
    ・ Built in MPPT
    ・ Switching frequency (160kHz,320kHz)
    ・ Charging current monitor by I²C
    ・ UVLO-detect Voltage:0.625V
    ・ UVLO-release Voltage:0.700V
    ・ Thermal Shutdown
    ・ 24 pin VQFN024V4040 (4.1mm×4.1mm)
 
 
Technical Data
Application Note

Thermal Resistance