BU1840AMUV-E Datasheet, PDF (1/17 Pages) Rohm – For 2Cell Solar,Synchronous Switch-Mode Charger IC

Datasheet
For 2Cell Solar,
Synchronous Switch-Mode Charger IC
BU1840AMUV
●General Description
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
●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<MAX>)
●Applications
„ Solar mobile phone
„ Solar audio
„ Solar portable charger
„ Solar LED illumination
●Package(s)
VQFN024V4040
W(Typ.) x D(Typ.) x H(Max.)
4.00mm x 4.00mm x 1.00mm
VQFN024V4040
●Typical Application Circuit(s)
<For 2 Cells Solar>
●Typical Performance characteristics
<Efficiency (for 2 cells solar)>
(VINMON=1.0V, OUTS=3.7V, Pin = 50mW ～ 2W)
100
SEL=GND
SEL=VIN
90
80
70
10
100
Pin [mW]
1000
10000
○Product structure：Silicon monolithic integrated circuit ○This product is not designed protection against radioactive rays
.www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
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TSZ02201-0Q1Q0AJ00130-1-2
2.AUG.2012 Rev.001