Analog Devices Inc. MAX17335 Charger/Fuel Gauge/Protector IC
Analog Devices Inc. MAX17335 AccuCharge + ModelGauge™ m5 EZ 1-Cell Charger/Fuel Gauge/Protector IC is a 35μA IQ stand-alone charger, fuel gauge, protector, and battery internal self-discharge detection IC for single-cell lithium-ion/polymer batteries. Using AccuCharge™ charger technology, the IC regulates charging by modulating the charge N-FET when a voltage source is present. The IC regulates charge voltage, current, and FET temperature. Stand-alone charging is supported by flexible configuration in nonvolatile memory. MAX17335's ideal diode circuit supports a quick response to system transients and adapter removal with low voltage drop across the CHG FET.
Utilizing the ModelGauge m5 EZ algorithm, the IC combines the short-term accuracy and linearity of a coulomb counter with the long-term stability of a voltage-based fuel gauge to provide industry-leading accuracy. MAX17335 automatically compensates for cell aging, temperature, and discharge rate while providing accurate state-of-charge (SOC) in milliampere-hours (mAh) or percentage (%) over a wide range of operating conditions.
The Analog Devices Inc. MAX17335 IC monitors the voltage, current, temperature, and battery state to protect against over/undervoltage, overcurrent, short-circuit, over/under-temperature, and overcharge conditions. Internal self-discharge protection using external high-side N-FETs ensures that the lithium-ion/polymer battery operates under safe conditions, prolonging the battery's life.
Features
- Non-volatile programmable stand-alone charger
- 1% charge current, 256 current settings
- 0.25% charge voltage, 2.42V to 4.8V range, configurable
- Optional manual charge control
- FET temperature limit and heat regulation
- Prequal, SmartFull, and Step-Charging options
- JEITA-9 temperature regions
- Battery health + programmable safety/protection
- Overvoltage/overcharge current, temperature region dependent
- Overcharge/discharge/short-circuit current
- Over/under-temperature
- Zero-volt or >1.8V charging options
- Undervoltage + SmartEmpty
- Pushbutton wakeup/factory ship mode (0.5μA)
- ModelGauge m5 EZ algorithm
- Percent, capacity, time-to-empty/full, and age
- Cycle+™ age forecast + age-scheduled charging
- Dynamic power - estimates power capability
- SHA-256 authentication to prevent cloning
- Precision measurement without calibration
- Current, voltage, power, time, and cycles
- Die temperature and two thermistors
- History logging and user data
- Low quiescent current
- FETs enabled: 35µA active, 21µA hibernate
- FETs disabled: 8µA ship, 0.5µA shutdown
- 2-wire (I2C) and 1-Wire®
- 1.9mm x 2.5mm, 15-bump, 0.5mm pitch wafer-level package (WLP)
Applications
- USB PPS and direct charging
- Smart batteries and hybrid supercap batteries
- Dual-screen smartphones and tablets
- Hearables, wearables, and smartwatches
- Medical devices, health, and fitness monitors
- Handheld radios, computers, and accessories
- Home/building automation, sensors, and cameras
- Parallel battery AR/VR systems
Specifications
- 2.16V to 4.9V operating supply voltage range
- 35µA operating supply current
- Maximum continuous source current
- 50mA for BATT (during zero-volt charging)
- 20mA for PFAIL
- Maximum continuous sink current
- 20mA for SDA, ALRT, and PFAIL
- 50mA for ZVC
- -40°C to +85°C operating temperature range
Simple Charger, Fuel Gauge with Protector Diagram
Related Development Tool
Analog Devices Inc. MAX17335 Evaluation Kit
Evaluates the MAX17335 AccuCharge + ModelGauge m5 EZ 1-Cell Charger/Fuel Gauge/Protector IC.