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.

Product Options

Orderable Part ID Part Status Type Carrier Type Buy Sample

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
RAJ240090 / RAJ240100 Datasheet Datasheet PDF 3.27 MB
RAJ240045 Data Sheet Datasheet PDF 2.73 MB
Application Notes & White Papers
Renesas Flash Programmer Usage from the Command Line 日本語 Application Note PDF 208 KB
Industrial Ethernet PHY Application Note PDF 1.21 MB
Industrial Ethernet PHY Application Note PDF 1.30 MB
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 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 日本語 Product Change Notice PDF 3.74 MB
Unification of a JEDEC tray and a embossed carrier tape for LQFP package 日本語 Product Change Notice PDF 1.46 MB
[Flyer] Renesas Software and Tools Flash Memory Programmer PG-FP6 日本語 Flyer PDF 417 KB
Industrial Power Management Brochure 日本語 Brochure PDF 3.13 MB
[Flyer] One Page Guide RAJ240045 Starter Kit Flyer PDF 512 KB
Power supply system Brochure PDF 5.75 MB