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DS2775G+T&R

ADI 2-cell Li+ stand-alone fuel gauge IC with integrated protector, 1-Wire interface, SHA-1 option, 14-TDFN

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Manufacturer Part：

DS2775G+T&R

Package：

14-TDFN-EP (3 x 5 mm)

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Description

Product Overview

The DS2775G+T&R from Analog Devices (Maxim Integrated) is a stand-alone 2-cell Li+ fuel gauge IC with integrated protector and optional SHA-1 authentication. It reports remaining battery capacity in mAh and percentage, providing accurate cell monitoring and safety protection for lithium-ion and lithium-polymer battery packs.

Key Specifications

Cells 2-cell Li+ / Li-Poly
Supply Voltage 4.0V to 9.2V
Interface 1-Wire (DS2775)
Voltage Measurement 4.88 mV resolution, ±5V range
Current Measurement ±51.2 mV sense range, 1.5625 uV LSB
Temperature 0.125°C resolution on-die sensor
Protection Overvoltage, undervoltage, overcurrent, short circuit
EEPROM 32-byte parameter + 16-byte user
Operating Temp -20°C to +70°C
Package 14-pin TDFN (3 x 5 mm)

Features

  • Stand-alone fuel gauge with FuelPack capacity estimation algorithm
  • Integrated high-side N-FET driver for overvoltage, undervoltage, overcurrent, and short-circuit protection
  • 1-Wire interface with 64-bit unique ID for battery pack identification
  • 16-byte user EEPROM for serial number, date code, or cycle count storage
  • Low-cost sense resistor for current measurement with gain calibration

Applications

  • 2-cell Li+ / Li-Poly battery pack fuel gauging
  • Power tool battery packs
  • Portable medical device battery management
  • Laptop battery pack monitoring and protection
  • Industrial handheld terminal battery packs

The DS2775G+T&R is an Analog Devices (Maxim) stand-alone fuel gauge IC for 2-cell lithium-ion and lithium-polymer battery packs. It reports remaining capacity in mAh and percentage using Maxim’s FuelPack algorithm, which accounts for discharge rate, temperature, and cell aging. The integrated Li+ protector drives external N-FETs for overvoltage, undervoltage, overcurrent, and short-circuit protection. A 1-Wire interface with 64-bit unique ID provides host access to all measurement and capacity data.

The DS2775 operates through three subsystems: (1) Fuel Gauge — measures cell voltages (VIN1, VIN2) every 440 ms with 4.88 mV resolution, current via sense resistor (±51.2 mV range, 1.5625 uV LSB), and temperature via on-die sensor (0.125°C resolution). The FuelPack algorithm combines coulomb counting with voltage-based capacity estimation, adjusting for discharge rate, temperature, and learned cell characteristics; (2) Protection — continuously monitors cell voltages and sense resistor voltage against programmable OV, UV, OC, and SC thresholds, driving CC (charge FET) and DC (discharge FET) gate outputs accordingly; (3) 1-Wire Communication — host communicates via 1-Wire protocol at up to 16.3 kbps using the DQ pin, with 64-bit unique ROM ID for pack identification.

Pin Name Function
1 VDD Battery positive supply
2,7 VIN1, VIN2 Cell voltage sense inputs
3 SNS Current sense resistor input
4 VSS Ground
5 CC Charge FET gate drive output
6 DC Discharge FET gate drive output
8 PLS Pack side sense / charger detect
9 PIO Programmable I/O
10 DQ 1-Wire data interface
11-14 NC/VSS No-connect / Ground
  • 2-cell power tool Li-Ion battery pack with integrated fuel gauge and safety protection
  • Laptop battery pack with 1-Wire host communication for capacity reporting
  • Portable medical device battery with accurate mAh remaining display
  • Industrial handheld terminal battery with EEPROM cycle-count tracking
  • UPS backup battery monitoring and protection module
Model Manufacturer Key Difference
DS2776G+T&R ADI SHA-1 authentication added
DS2777G+T&R ADI 2-wire I2C interface version
DS2778G+T&R ADI 2-wire I2C + SHA-1 authentication
BQ40Z50-R2 TI Multi-cell gauge with Impedance Track
RAJ240045 Renesas 2-cell fuel gauge alternative
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