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Multi-Cell Li-ion Battery Protection ICs

Ricoh's multi-cell Li-ion/polymer battery protection ICs have several advanced features such as Cell Balance Function, Cascade Connection and Breaking Wire Detection.

Product
Name
Cells Overcharge
Detector
Threshold [V]
(Accuracy)
Overdischarge
Detector
Threshold [V]
(Accuracy)
Excess Discharge Current
Detector Threshold [V]
(Accuracy)
Excess Charge
Current Detector
Threshold [V]
(Accuracy)
Supply
Current
[µA]
Remarks Package Download
VD3-1 VD3-2
R5431 3 to 4 3.6 to 4.5
(±25mV)
2.0 to 3.0
(±2.5%)
VDD-0.2
(±20mV)
VDD-0.6
(±100mV)
VDD+0.2
(±30mV)
12.0
  • High side protection FET
SSOP-16 Datasheet
R5432 3 to 5 3.6 to 4.5
(±25mV)
2.0 to 3.0
(±2.5%)
0.1 to 0.3
(±20mV)
0.45 or 0.60
(±100mV)
-0.2 to -0.05
(±30mV)
or
-0.4
(±40mV)
12.0
  • Cascade Connection*1
  • Built-in Cell Balance Function
  • Built-in Breaking Wire Detection
SSOP-24 Datasheet
0.25 to 0.40
(±70mV)
0.25 or 0.30
(±55mV)
R5433 3 to 5 3.6 to 4.5
(±25mV)
2.0 to 3.0
(±2.5%)
- - - 6.0
  • Built-in Breaking Wire Detection
  • COUT/DOUT pin Signal Output Type*2
SSOP-16 Datasheet
NEW
R5436
3 to 5 3.6 to 4.5
(±25mV)
2.0 to 3.2
(±2.5%)
0.05 to 0.25
(±20mV)
3×VD3-1
(±50mV)
-0.2 to -0.05
(±30mV)
12.0
  • Cascade Connection*1
  • Built-in Cell Balance Function
  • Built-in Breaking Wire Detection
  • External NTC Temperature Protection Function
TSSOP-28 Datasheet

*1 Cascadable for 6-cell, or higher cell protections.
*2 Over-charge/-discharge is controlled by sending a signal to MCU from the COUT/DOUT pin.

TYPICAL APPLICATION

TYPICAL APPLICATION

Cell Balance Operation

Cell Balance Operation

  • (1) When a cell voltage is lower than the cell balance threshold, a cell is charged.
  • (2) When a cell voltage becomes higher than the cell balance threshold, CB1 pin becomes "H" and N-channel transistor turns on, and then the cell balance operation starts. Then a bypass current flows to the direction of a arrow and a charge current becomes suppressed by the bypass current.
  • (3) When a cell voltage reaches to the over-charge threshold, cell charging stops after the output delay time.
  • (4) If charging to a cell stops, the cell balance operation continues until a cell voltage becomes lower than the cell balance released threshold. The bypass current continues to flow decreasing the cell voltage.
  • (5) When a cell voltage reaches to the cell balance released voltage, CB1 pin becomes "L" and N-channel transistor turns off, and then cell balance operation stops.

Breaking Wire Detection

In case of using a battery pack in electric power tools exposed to heavy vibrations, there is a risk that the protection circuit fails due to a breaking wire condition between battery cells and protection circuit board.

The Breaking Wire Detection circuit performs a test at fixed intervals, depending on the capacitance connected to CTLT pin. When a breaking wire event occurs, it results in interrupting the charge or discharge condition.

Cascade Connection

Multi cell Li-ion/polymer battery protection ICs can protect over 6cells by cascade connection.

Cascade Connection

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