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BQ24020

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Dual input USB/AC Adpater 1-cell Li-ion charger w/charge enable & temp sense in QFN-11

BQ24020 is in the process of being discontinued
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Same functionality with different pin-out to the compared device
BQ25170 ACTIVE 800-mA linear battery charger for 1-cell Li-ion and LiFePO4 Supports multiple resistor programmable battery voltage with lower IQ

Product details

Number of series cells 1 Charge current (max) (A) 1 Vin (max) (V) 6.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 7 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 1 Charge current (max) (A) 1 Vin (max) (V) 6.5 Cell chemistry Li-Ion/Li-Polymer Battery charge voltage (min) (V) 4.2 Battery charge voltage (max) (V) 4.2 Absolute max Vin (max) (V) 7 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile) Vin (min) (V) 4.5 Rating Catalog Operating temperature range (°C) -40 to 125
VSON (DRC) 10 9 mm² 3 x 3
  • Small 3 mm × 3 mm MLP Package
  • Charges and powers Systems from Either AC Adapter or USB With Autonomous power-Source Selection
  • Integrated USB Control With Selectable 100 mA and 500 mA Charge Rates
  • Ideal for Low-Dropout Charger Designs for Single-Cell Li-Ion or Li-pol Packs in Space Limited portable applications
  • Integrated power FET and Current Sensor for Up to 1-A Charge applications From AC Adapter
  • Precharge Conditioning With Safety Timer
  • power Good (AC Adapter Present) Status Output
  • Optional Battery Temperature Monitoring Before and During Charge
  • Automatic Sleep Mode for Low-power Consumption
  • APPLICATIONS
    • PDAs, MP3 Players
    • Digital Cameras
    • Internet appliances
    • Smartphones

bqTINY is a trademark of Texas Instruments.

  • Small 3 mm × 3 mm MLP Package
  • Charges and powers Systems from Either AC Adapter or USB With Autonomous power-Source Selection
  • Integrated USB Control With Selectable 100 mA and 500 mA Charge Rates
  • Ideal for Low-Dropout Charger Designs for Single-Cell Li-Ion or Li-pol Packs in Space Limited portable applications
  • Integrated power FET and Current Sensor for Up to 1-A Charge applications From AC Adapter
  • Precharge Conditioning With Safety Timer
  • power Good (AC Adapter Present) Status Output
  • Optional Battery Temperature Monitoring Before and During Charge
  • Automatic Sleep Mode for Low-power Consumption
  • APPLICATIONS
    • PDAs, MP3 Players
    • Digital Cameras
    • Internet appliances
    • Smartphones

bqTINY is a trademark of Texas Instruments.

The bqTINY-II series are highly-integrated, flexible Li-Ion linear charge and system power management devices for space-limited charger applications. In a single monolithic device, the bqTINY-II offers integrated USB-port and ac-adapter supply management with autonomous power-source selection, power-FET and current-sensor interfaces, high-accuracy current and voltage regulation, charge status, and charge termination.

The bqTINY-II automatically selects the USB-port or the ac-adapter as the power source for the system. In the USB configuration, the host can select from two preset charge rates of 100 mA or 500 mA. In the ac-adapter configuration, an external resistor sets the system or charge current.

The bqTINY-II charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The bqTINY-II automatically restarts the charge if the battery voltage falls below an internal threshold. The bqTINY-II automatically enters sleep mode when both supplies are removed.

Different versions of the bqTINY-II offer many additional features. These include a temperature-sensor input for detecting hot or cold battery packs, a power-good output (PG) indicating the presence of input power, a TTL-level charge-enable input (CE) used to disable or enable the charge process, and a TTL-level timer and taper-detect enable input (TTE) used to disable or enable the fast-charge timer and charge termination.

The bqTINY-II series are highly-integrated, flexible Li-Ion linear charge and system power management devices for space-limited charger applications. In a single monolithic device, the bqTINY-II offers integrated USB-port and ac-adapter supply management with autonomous power-source selection, power-FET and current-sensor interfaces, high-accuracy current and voltage regulation, charge status, and charge termination.

The bqTINY-II automatically selects the USB-port or the ac-adapter as the power source for the system. In the USB configuration, the host can select from two preset charge rates of 100 mA or 500 mA. In the ac-adapter configuration, an external resistor sets the system or charge current.

The bqTINY-II charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. An internal charge timer provides a backup safety for charge termination. The bqTINY-II automatically restarts the charge if the battery voltage falls below an internal threshold. The bqTINY-II automatically enters sleep mode when both supplies are removed.

Different versions of the bqTINY-II offer many additional features. These include a temperature-sensor input for detecting hot or cold battery packs, a power-good output (PG) indicating the presence of input power, a TTL-level charge-enable input (CE) used to disable or enable the charge process, and a TTL-level timer and taper-detect enable input (TTE) used to disable or enable the fast-charge timer and charge termination.

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Technical documentation

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Type Title Date
* Data sheet Single-Chip Li-Ion & Li-Pol Charger IC w/Autonomous USB-Port & AC Adapt datasheet (Rev. E) 21 Nov 2007
Application note QFN and SON PCB Attachment (Rev. C) PDF | HTML 06 Dec 2023
Analog Design Journal Designing a linear Li-Ion battery charger with power-path control 01 May 2009
Analog Design Journal Q2 2009 Issue Analog Applications Journal 01 May 2009

Design & development

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

Evaluation board

BQ24020EVM — bq24020 bqTINY-II Evaluation Module

The bq24020EVM is an evaluation tool for the bq24020 linear single-cell Li-Ion charger with autonomous USB and AC adapter power management in 3x3mm2 QFN package. The EVM is a complete designed-and-tested charger circuit that allows the user to test all functions of the bq24020 and to charge a (...)

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Support software

TEMPSENSE-SW — Temp Sense Designer Software

The TempSense Designer software allows the user to easily design temperature sensing circuits for many of the Texas Instruments battery charger devices. A full listing of the supported devices is included under the "Support" menu in the program. The user can use the thermisters included in the (...)
Gerber file

Linear Charger NTC Calculator

SLUC670.ZIP (350 KB)
Package Pins Download
VSON (DRC) 10 View options

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