Skip to main content Skip to first level navigation

RICOH imagine. change.


Skip to main content First level navigation Menu
Main content

R5461K Series

Li-ion/Polymer 2Cell Protector with Alarm function



The R5461K Series are high voltage CMOS-based protection ICs for over-charge/discharge of rechargeable two-cell Li-ion/Lithium polymer, further include an alarm function and a short protection for preventing large external short circuit current and the protection circuits against the excess discharge-current and excess charge current.

Each of these ICs is composed of detectors, a temperature detector, reference units, a delay circuit, a short circuit protector, an oscillator, a counter, and logic circuits. The signal is outputted before detecting over-charge due to having an alarm function.

They are settable for normal, high and low temperature. So they can make it safer to charge a battery. The Over-charge detector threshold and the alarm detector threshold are high accuracy such as +10mV/-15mV. DFN(PLP)2527-10 package is available.


Manufactured with High Voltage Tolerant Absolute Maximum Rating ProcessSupply Voltage (VDD) 12V (Absolute Maximum Rating)
Charge Negative Input voltage (V-) -30V (Absolute Maximum Rating)
Low supply currentSupply Current (IDD) Typ.4.0µA (G Version)
Typ.5.0µA (C Version)
Standby Current (Is) Typ.0.1µA
High accuracy detector thresholdAlarm +10mV/-15mV (0∼60°C)
Over-charge +10mV/-15mV (0∼50°C)
Over-discharge ±2.5%
Excess Discharge-current ±15mV
Excess Charge-current ±30mV
Variety of detector thresholdAlarm 3.2V to 4.5V (0∼45°C)
3.1V to 4.4V (45∼60°C)
Over-charge 3.6V to 4.3V (0∼50°C)
Over-discharge 2.0V to 3.0V
Excess Discharge-current 0.05V to 0.24V
Excess Charge-current -0.22V to -0.1V
Internal fixed Output delay timeAlarm Typ.6ms
Over-charge Typ.1.0s
Over-discharge Typ.128ms
Excess Discharge-current Typ.12ms
Excess Charge-current Typ.8ms
Short Protection Typ.300µs
Alarm threshold can be changed by the temperature Alarm temperature 45°C
Output Delay Time Shortening Function At COUT is "H", if V- is set at -1.6V, the Output Delay time of detector and release for the over-charge and over-discharge can be reduced.
0V-charge Selectable
Package DFN(PLP)2527-10

Tap to see the table


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

Documents Download

Flyer(PDF) Package Info. Quality Assurance Data
R5461K Series DFN(PLP)2527-10 Reliability

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

Inquiry about products

Technical Support

Inquiries (SSL Form)

Inquiry about business

Purchase, Request for Samples and Documents


Sample Online

Online Distributors