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.


Title language Type Format File Size Date
star RAJ240045 Data Sheet Datasheet PDF 2.73 MB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Battery Fuel Gauge IC Starter Kit Brochure PDF 207 KB
Renesas Software and Tools Flash Memory Programmer PG-FP6 日本語, 简体中文 Flyer PDF 417 KB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package (Additional Information & Correction) 日本語 Product Change Notice PDF 4.86 MB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package ( PC-WRP-A001B/E ) 日本語 Product Change Notice PDF 3.74 MB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package ( PC-WRP-A001A/E ) 日本語 Product Change Notice PDF 1.46 MB
[Notes] Renesas Flash Programmer 日本語 Tool News - Note PDF 29 KB