Analog Devices Inc./Maxim Integrated DS2784G+

Overview

DS2784G+ from Maxim Integrated is a single-cell Li+/Li-polymer fuel gauge IC with integrated protection circuitry and SHA-1 authentication. It delivers precision voltage (±30 mV), temperature (±3°C), and current (±1% full scale) measurements, estimates remaining capacity in mAh and %, and supports 1-Wire communication at 16 kbps or 143 kbps for battery pack integration in portable medical and industrial devices.

For engineers reviewing the DS2784G+ datasheet, DS2784G+ pinout, DS2784G+ application, or DS2784G+ equivalent, this page provides verified technical context on its FuelPack™ algorithm, high-side FET control architecture, programmable safety thresholds, EEPROM-based aging compensation, and 1-Wire authentication protocol-key selection criteria for smart battery design.

Technical Context

The DS2784G+ implements a piecewise-linear battery model using real-time coulomb counting, discharge-rate-dependent voltage sag correction, and temperature-compensated cell characterization to estimate available capacity. Its 10-bit + sign ADC measures VIN (0–4.6 V, 4.88 mV resolution), SNS (±51.2 mV, 1.56 µV/RSNS resolution), and internal temperature (–128°C to +127.875°C, 0.125°C resolution) every 440 ms.

Protection logic uses a high-side topology with 9 V charge pump (VCP = 8.5–10.0 V) driving CC and DC outputs; thresholds-including overvoltage (4.252–4.507 V), undervoltage (2.40–2.50 V), and short-circuit (120–360 mV)-are user-programmable via 8-bit threshold register. SHA-1 authentication operates with 64-bit secret and challenge, requiring 30 ms computation time.

Key Specifications

Pinout & Package

DS2784G+ is housed in a Pb-free, 14-pin TDFN package (3 mm × 5 mm) with exposed pad (EP), optimized for embedding inside thin prismatic Li+ battery packs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fuel gauge with protection and authentication applications.

Compared with BQ27426YZFT and MAX17055G+T-1W, the DS2784G+ uniquely combines fuel gauging, high-side protection, and SHA-1 authentication in one 14-pin TDFN package - eliminating need for discrete protectors, secure elements, or interface translation logic in space-constrained battery packs.

Availability

DS2784G+ is available at Aetrix Electronics and suitable for health monitors, medical diagnostics, digital cameras, and power tools requiring stable component supply, long-term lifecycle support, and guaranteed traceability for regulated end equipment.

Supply support for DS2784G+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for industrial, medical, and consumer applications - emphasizing reliability, integration, and security.

The DS2784G+ belongs to Maxim's Fuel Gauge and Protector product line, engineered specifically for compact, authenticated smart battery packs in portable electronics where size, safety, and anti-counterfeiting are critical.

FAQ

What is the primary function of the DS2784G+ in a battery pack?

The DS2784G+ serves as an integrated fuel gauge, protector, and authentication token for single-cell Li+ packs. It precisely estimates remaining capacity in mAh and %, enforces overvoltage/undervoltage/overcurrent protection via high-side FET drivers, and validates battery authenticity using SHA-1 HMAC - all within one 14-pin TDFN package. This eliminates the need for separate fuel gauge, protector, and secure element ICs.

How does the DS2784G+ achieve accurate capacity estimation across temperature and load?

The DS2784G+ uses its FuelPack™ algorithm, which combines real-time coulomb counting, temperature-compensated voltage modeling, discharge-rate-dependent sag correction, and cell aging data stored in EEPROM. It measures voltage (±30 mV), temperature (±3°C), and current (±1% full scale) every 440 ms, then applies piecewise-linear battery characterization to deliver conservative yet accurate available capacity estimates under varying conditions.

What protection features does the DS2784G+ provide and how are they configured?

The DS2784G+ provides overvoltage (4.252–4.507 V), undervoltage (2.40–2.50 V), charge/discharge overcurrent (–72 to +96 mV), and short-circuit (120–360 mV) protection with programmable delays (tOVD = 425–1150 ms, tSCD = 80–160 µs). Thresholds are set via an 8-bit register stored in EEPROM, and protection responses - including CC/DC FET control and flag reporting - are implemented in hardware without host intervention.

Can the DS2784G+ operate in low-power modes and how is wake-up managed?

Yes, the DS2784G+ supports Active and Sleep modes. In Sleep mode, it draws only 0.4–4 µA while preserving register contents and disabling measurement functions. Wake-up occurs via charger connection (PLS > VDD + 50 mV), VIN ≥ VUV, or low-to-high transition on DQ/PIO - the latter enabled by power-switch configuration bits (PSDQ/PSPIO) for dry-contact activation. A 100 ms debounce filters mechanical switch noise.

What memory resources are available on the DS2784G+ and how are they used?

The DS2784G+ includes 32 bytes of parameter EEPROM for factory/user calibration data, cell characteristics, and aging compensation; and 16 bytes of user EEPROM for host-defined data such as battery lot/date codes or usage statistics. Both are rated for 50,000 write cycles at +50°C. The 1-Wire interface provides full read/write access, and EEPROM copy operations complete in 10 ms.