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Li-ion Battery Second Protection ICs

Ricoh's Li-ion/polymer battery second protection ICs support over-charge voltage protection only. These are suitable from 1-cell to 5-cell battery pack.

Product Name Cells Overcharge
Detector
Threshold [V]
(Accuracy)
Overcharge
Output Delay
Time [s]
COUT Output
High Voltage[V]
Shutdown
Detector
Threshold [V]
Shutdown
Current
[µA]
Supply
Current
[µA]
Remarks Package Download
R5434 2 to 5 3.6 to 4.6
(±25mV)
1.5 3.7 - - 3.0   SON-8 Datasheet
R5435 2 to 3 4.10 to 4.55
(±20mV)
2, 4 or 6 4.7 3.5 0.1 3.0   DFN(PLP)1616-6B
TSOT-23-6
Datasheet
R5437 1 to 3 4.10 to 4.60
(±20mV)
2, 4 or 6 4.7 3.5 0.1 0.85   DFN1814-6C*1 Datasheet
R5438 1 to 3 4.10 to 4.60
(±20mV)
1, 2, 4 or 6 4.7 3.5 0.1 0.85   DFN1814-6C*1 Datasheet
R5439 2 to 4 4.20 to 4.60
(±20mV)
2, 4 or 6 4.7 1: 3.8
2: 2.3 to 2.8
0.2 4.0*2 with VR DFN(PLP)2020-8 Datasheet
R5458 1 4.0 to 4.7
(±20mV)
2 VDD - 0.5 1.5   DFN1814-6C Datasheet
NEW
R5640
2 to 5 3.6 to 4.6
(±16mV)
2, 4, 6, 10 or 16 4.7 2.5 or 3.7 0.2 2.5   MSOP-8 Datasheet
NEW
R5641
2 to 4 4.1 to 4.6
(±16mV)
2, 4 or 6 4.7 2.5 or 3.7 0.2 2.8   DFN2020-8C Datasheet

*1 The pin-layout of R5437 and that of R5438 is different.
*2 VCELLn=4.15V, n=1,2,3,4

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