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Parameters

Number of series cells 1 Charge current (Max) (A) 0.5 Operating Vin (Max) (V) 5.5 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.6 Battery charge voltage (Max) (V) 4.6 Absolute Vin (safety rating) (Max) ((V)) 20 Control topology Linear Control interface I2C Features BAT temp thermistor monitoring (JEITA profile), BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Integrated LDO, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Operating Vin (Min) (V) 3.15 Rating Catalog open-in-new Find other Battery charger ICs

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Features

  • Linear battery charger with 1.25-mA to 500-mA fast charge current range
    • 0.5% Accurate I2C programmable battery regulation voltage ranging from 3.6 V to 4.6 V in 10-mV steps
    • Configurable termination current supporting down to 0.5 mA
    • 20-V Tolerant input with typical 3.4-V to 5.5-V input voltage operating range
    • Programmable thermal charging profile, fully configurable hot, warm, cool and cold thresholds
  • Power Path management for powering system and charging battery
    • I2C Programmable regulated system voltage (PMID) ranging from 4.4V to 4.9V in addition to battery voltage tracking and Input pass-though options
    • Dynamic power path management optimizes charging from weak adapters
    • Advanced I2C control allows host to disconnect the battery or adapter as needed
  • I2C Configurable load switch or up to 150-mA LDO output
    • Programmable range from 0.6 V to 3.7 V in 100-mV steps
  • Ultra low Iddq for extended battery life
    • 10-nA Ship mode battery Iq
    • 400-nA Iq While powering the system (PMID and VDD on)
  • One push-button wake-up and reset input with adjustable timers
    • Supports system power cycle and HW reset
  • 20-Pin 2-mm x 1.6-mm CSP package
  • 11-mm2 Total solution size

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Description

The BQ21062 is a highly integrated battery charge management IC that integrates the most common functions for wearable, portable and small medical devices, namely a charger, a regulated output voltage rail for system power, a Load Switch/LDO, and push-button controller.

The BQ21062 IC integrates a linear charger with Power Path that enables quick and accurate charging for small batteries while providing a regulated voltage to the system. The regulated system voltage (PMID) output may be configured through I2C based on the recommended operating condition of downstream IC’s and system loads for optimal system operation.

The device supports charge current up to 500 mA and supports termination current down to 0.5 mA for maximum charge. The battery is charged using a standard Li-Ion charge profile with three phases: pre-charge, constant current and constant voltage regulation.

The device integrates advanced power path management and control that allows the device to provide power to the system while charging the battery even with poor adapters. The host may also control the power path through I2C allowing it to disconnect the input adapter and/or battery without physically removing them. The single push-button input eliminates the need of a separate button controller IC reducing the total solution footprint. The push-button input can be used for wake functions or to reset the system. The low quiescent current during operation and shutdown enables maximum battery life. The input current limit, charge current, LDO output voltage, and other parameters are programmable through the I2C interface making the BQ21062 a very flexible charging solution. A voltage-based JEITA compatible (or standard HOT/COLD) battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The temperature thresholds are also programable through I2C allowing the host to customize the thermal charging profile. The charger is optimized for 5-V USB input, with 20-V absolute maximum tolerance to withstand line transients. The device also integrates a linear regulator to provide a quiet rail for radios or processors and can be independently sourced and controlled through I2C.

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Same functionality and pinout but is not an equivalent to the compared device:
BQ25155 ACTIVE 500-mA 1-cell linear charger with 10-nA IQ, power path, regulated system voltage, 16-bit ADC and LDO This product is a 500-mA 1-cell linear charger with 16-bit ADC, 10-nA IQ, power path, regulated system voltage and LDO
Similar but not functionally equivalent to the compared device:
BQ25125 ACTIVE Low IQ highly integrated battery charge management solution for wearables and IoT This product is a 300-mA, I2C, Li-ion battery charger with integrated DC-DC buck and LDO in a 2.5x2.5mm package

Technical documentation

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Type Title Date
* Datasheet BQ21062 I2C Controlled 1-Cell 500-mA Linear Battery Charger With 10-nA Ship Mode datasheet Jul. 24, 2020
Technical articles When to use rechargeable batteries in small battery applications Oct. 01, 2019
Technical articles Should I use a linear charger or a switching charger? Oct. 30, 2015
Technical articles Summertime and the livin' is easy Jun. 20, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

INTERFACE ADAPTERS Download
document-generic User guide
199
Description

The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)

Features
  • Fully powered from the USB port
  • Optional 5-V port for powering high power voltage drivers (future upgrade)
  • Complete interface between the USB and SMBus, I2C (8/16) interfaces
  • Expansion port for future upgrades

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