3 to 5 Serial Cell Li-Ion or Li-Polymer Battery Protection IC
The R5436T is an overcharge, overdischarge and overcurrent protection IC for Li-ion or Li-polymer secondary
battery. Overcharge, Overdischarge, Charge Overcurrent and Discharge Overcurrent for 3 to 5 serial cells can
be detected. By cascade connection using the R5436T, it is also possible to protect 6-serial or more cells
rechargeable battery pack. The R5436T provides a cell-balancing function to equalize imbalance between
cells, and it provides an open-wire detection to detect a broken wire between a battery and the circuit board.
The open-wire detection is optionally selectable.
High Voltage Tolerant Process
Absolute Maximum Ratings ······································30 V
Low Supply Current
Normal operation with using 5 cells ···························Typ. 12.0 µA
Standby ······························································Typ. 6.0 µA
High-accuracy Voltage Detection
Overcharge detection voltage (VDET1n(1)) ·····················3.6 V to 4.5 V (in 5 mV steps)
Overcharge detection voltage accuracy······················± 0.025 V (Ta = 25°C)
Overdischarge detection voltage (VDET2n(1)) ·················2.0 V to 3.2 V (in 5 mV steps)
Overdischarge detection voltage accuracy ··················± 2.5%
Discharge overcurrent detection voltage1 (VDET31) (2) ·····0.05 V to 0.25 V (in 10 mV steps)
Discharge overcurrent detection voltage accuracy ········± 20mV
Discharge overcurrent detection voltage2 ···················Three times VDET31
Short-circuit detection voltage(3)································0.25 V to 1.0 V (in 20 mV steps)
Charge overcurrent detection voltage ························-0.05 V / -0.1 V / -0.2 V
Charge overcurrent detection voltage accuracy············± 30 mV
Overcharge release voltage·····································VDET1n–0.1V to VDET1n–0.4V (in 10mV steps)
Overdischarge release voltage ·································VDET2n+0.0V to VDET2n+0.7V (in 50mV steps)
–provided, max.value is 3.2V.
Cell-balancing detection voltage (VCBDn(1)) ···················3.45V to 4.45V (in 5 mV steps)
Cell-balancing release voltage ·································VCBDn–0.0V to VCBDn–0.4V (in 10mV steps)
Each Detection DelayTime
Overcharge detection delay time ······························1.0 sec
Overdischarge detection delay time settable by external capacitor
Discharge overcurrent detection delay time 1/2 settable by external capacitor
Charge overcurrent detection delay time ····················8 ms
Short-circuit detection delay time ······························330 µs
Zero Voltage Charging··············································Available
(1) VDET1n, VCBDn : n =1, 2, 3, 4, 5
(2) Set to meet the following equation: (3×VDET31+0.05<0.8×VSHORT).
(3) VDET32 is not detected when VDET32 is higher than VSHORT.