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R5402N Series

Li-ion/polymer 1Cell Protector



The R5402N Series are high input voltage CMOS-based protection ICs for over-charge/discharge of rechargeable one cell Lithium-ion (Li-ion) / Lithium polymer excess load current, further include a short circuit protector for preventing large external short circuit current and excess charge/discharge-current.

Each of these ICs is composed of four voltage detectors, reference units, a delay circuit, a short circuit protector, an oscillator, a counter, and a logic circuit. SOT-23-6 package is available.


Manufactured with High Voltage Tolerant Absolute Maximum Rating Process Supply Voltage (VDD) 12V (Absolute Maximum Rating)
Charge Negative Input voltage (V-) -35V (Absolute Maximum Rating)
Low supply current Supply Current (IDD) Typ.4.0µA
Standby Current (Is) Max.0.1µA (C Version)
Max.2.0µA (B, D Version)
High accuracy detector threshold Over-charge ±25mV (25°C), ±30mV (-5 to 55°C)
Over-discharge ±2.5%
Excess discharge-current ±15mV
Excess charge-current ±30mV
Variety of detector threshold Over-charge 4.0V to 4.5V (0.005V steps)
Over-discharge 2.0V to 3.0V (0.1V steps)
Excess discharge-current 0.05V to 0.20V (0.005V steps)
Excess charge-current -0.1V
Internal fixed Output delay time Over-charge detector Output Delay Typ.1.0s or 0.25s
Over-discharge detector Output Delay Typ.20ms
Excess discharge-current Typ.6ms or 12ms
Excess charge-current Typ.8ms or 16ms
Short Circuit detector Output Delay Typ.200µs or 300µs
Output Delay Time Shortening Function At COUT is “H”, if V-level is set at –2.0V, the Output Delay time of detector and release the over-charge and over-discharge can be reduced.
Delay time for over-charge becomes about 1/57 of normal state.
0V-charge option Available
Package SOT-23-6

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  • Li-ion / Li polymer protector of over-charge, over-discharge, excess discharge-current, excess charge-current for battery pack
  • High precision protectors for cell-phones and any other gadgets using on board Li-ion / Li polymer battery

Documents Download

Flyer Package Info. Quality Assurance Data
R5402N Series SOT-23-6 Reliability

All PDF files are less than 1MB unless otherwise stated.

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