2 to 4 Series Li-ion Battery Manager

Product Status: Mass Production


RAJ240045 is Renesas Li-ion battery fuel gauge IC (FGIC) which consists of a MCU device and an AFE device in a single package. Pack with a variety of battery management features and Renesas RL78 CPU core which has multiple low power modes and capable of achieving high performance in ultra-low power operation. RAJ240045 fuel gauge IC has control firmware stored in embedded flash memory to control attached embedded analog and digital circuits to execute battery voltage / current / temperature measurement, remaining capacity estimation, over current / voltage / temperature protection and other battery management operations.


    • Fully integrated battery management solution with battery capacity measurement and programmable protection capability.
    • Supports 2-4 series Li-ion or Li-Polymer battery cells
    • Integrated with Renesas Ultra Low Power RL78 CPU core for multi-function process
    • MemoryCode flash memory: 64KB Data flash memory (up to 100,000 erase/write cycles): 4 KBSRAM: 4 KB
    • Clock generatorHigh speed on-chip oscillator: up to 32 MHz Low speed on-chip oscillator: 15 KHzAFE on-chip oscillator: 4.194MHz
    • General Purpose I/O PortsTotal: 12 pinsCMOS input/output: 6CMOS input: 2N-ch open drain: 2 High voltage input [VCC tolerance]: 1High voltage output [VCC tolerance]: 1
    • Serial interface CSI (SPI): 1 channelI2C: 1 channelUART: 1 channelSimplified I2C: 1 channel
    • TimerMCU 16-bit timer: 5 channelsMCU 12-bit interval timer: 1 channelAFE timer: 2 channels- AFE timer A: setting range: 125 ms to 64 s- AFE timer B: setting range:30.52 us to 125 ms
    • Embedded A/D converterAFE 15-bit resolution sigma-delta A/D converter
    • Current integration circuit18-bit resolution sigma-delta A/D converter
    • Impedance measurement circuitSimultaneous measurement of battery voltage and current
    • Over current detection circuitShort circuit current detectionCharge overcurrent detection Discharge overcurrent detectionCharge wakeup current detectionDischarge wakeup current detection
    • Series regulator3.3V CREG21.8V CREG1
    • Charge and Discharge MOSFET controlHigh side Nch MOSFET drive circuit embeddedProgrammable MOSFET control by 8-bit PWM
    • Fuse controlFUSEOUT pin can support fuse blow function.
    • Support Intel® Dynamic Battery Power Technology (Intel® DBPT) Note
    • Voltage and temperature conditionPower supply voltage: VCC = 4.0 to 25 V Operating ambient temperature: Ta = -20 to +85°C
    • Package Information32 pin plastic mold QFN ([Body] 4.0 mm x 4.0 mm, 0.4 mm pitch)

      Note Intel and the Intel logo are trademarks of Intel Corporation or its subsidiaries in the U.S. and/or other countries.


 Block Diagram


Basic Information
Package Type
Pin Count
Supply voltage (V)
4.0 to 25
Family/ Series
Fuel Gauge IC (FGIC)
Li-ION battery Fuel gauge
Battery Management Unit
Battery fuel gauging
Target application
Portable equipment
Battery Protection, Fuel gauging
Production Status
Mass Production