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Product details

Parameters

Number of series cells 2 Charge current (Max) (A) 3 Operating Vin (Max) (V) 17 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (Min) (V) 3.4 Battery charge voltage (Max) (V) 9 Absolute Vin (safety rating) (Max) ((V)) 28 Control topology Switch-Mode Buck Control interface Standalone, Standalone (RC-Settable) Features BAT temp thermistor monitoring (hot/cold profile), IINDPM (Input current limit), Input OVP Operating Vin (Min) (V) 4 Rating Catalog open-in-new Find other Battery charger ICs

Package | Pins | Size

WQFN (RTE) 16 9 mm² 3 x 3 open-in-new Find other Battery charger ICs

Features

  • High-efficiency, 1.2-MHz, synchronous switch-mode buck charger
    • 92.5% Charge efficiency at 2 A from 5-V input for 1-cell battery
    • 91.5% Charge efficiency at 2 A from 9-V input for 1-cell battery
    • 94% Charge efficiency at 2 A from 12-V input for 2-cell battery
  • Single input to support USB input and adjustable high voltage adaptors
    • Support 4.0-V - 17-V input voltage range with 28-V absolute maximum input voltage rating
    • Input Voltage Dynamic Power Management (VINDPM) from 4.0 V up to 1.0834*VBAT – 50 mV
  • High integration
    • Synchronous switching MOSFET
    • Internal lossless input and charge current sense
    • Internal loop compensation
    • Integrated bootstrap diode
  • 3.0-A Input current limit
  • 3.0-A Maximum fast charge current
  • 1-µA Low battery leakage current at 4.5-V battery
  • 4-µA VBUS Supply current in IC disable mode
  • Charge current thermal regulation at 120ºC
  • Precharge current: 10% of fast charge current
  • Termination current: 10% of fast charge current
  • Charge accuracy
    • ±0.5% Charge voltage regulation
    • ±10% Charge current regulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input Under Voltage Lockout (UVLO) and Over Voltage Protection (OVP)
    • Battery overcharge protection
    • Safety timer for precharge and fast charge
    • No charge at current setting pin ICHG open or short
    • No charge at battery feedback pin FB open or short
    • Cold/hot battery temperature protection
  • Available in WQFN 3x3-16 package

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Description

The BQ25306 is a highly-integrated standalone switch-mode battery charger for single cell and dual cell Li-Ion, Li-polymer, and LiFePO4 batteries. The BQ25306 supports a 4.0-V to 17-V input voltage for fast charging. The device’s sensorless topology enables high charge efficiency and low BOM cost. The device’s best-in-class 1-uA low quiescent current conserves battery energy and maximizes the shelf time for portable devices. The BQ25306 is available in a 3x3 WQFN package for easy 2-layer layout and space limited applications.

The BQ25306 supports a 4-V to 17-V input to charge either single cell batteries or dual batteries in series with charge voltage from 3.4 V to 9.0 V programmable by resistor divider. The device features fast charging for portable devices. Its input voltage and current regulation delivers maximum charging power to the battery. The solution is highly integrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), and low-side switching FET (LSFET, Q3).

The BQ25306 features lossless current sensing to reduce power loss and BOM cost with minimized component count. It also integrates a bootstrap diode for the high-side gate drive and battery temperature monitor to simplify system design. The device initiates a charge and completes a charging cycle without host control. The BQ25306 charge voltage and charger current are set by external resistors. The BQ25306 charge voltage is programmed by an external resister divider and it charges the battery in three phases: pre-conditioning, constant current, and constant voltage. At the end of the charging cycle, the charger automatically terminates if the charge current is below the termination current threshold and the battery voltage is above the recharge threshold. When the battery voltage falls below the recharge threshold, the charger will automatically start another charging cycle. The charger provides various safety features for battery charging and system operations, including battery temperature monitoring based on negative temperature coefficient (NTC) thermistor, charge safety timer, input over voltage and over current protections, as well as battery over voltage protection. Pin open and short protection is also built in to protect the charge current setting pin or battery voltage feedback pin if accidently opened or shorted to GND. The thermal regulation regulates charge current to limit die temperature during high power operation or high ambient temperature conditions.

The STAT pin output reports charging status and fault conditions. The BQ25306 provides up to 3-A continuous charge current to a single cell (1S) battery or dual cell batteries in series (2S). When the input voltage is removed, the device automatically enters a low current HiZ mode with very low battery leakage current to the charger device. The BQ25306 is available in a 3 mm x 3 mm thin WQFN package.

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BQ25302 PREVIEW Standalone single cell 2.0-A buck battery charger Optimized for 5-V input and 1 S battery

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet BQ25306 Standalone 17-V, 3.0-A Single Cell and Dual Cell Buck Battery Charger datasheet Mar. 19, 2020
Technical articles 5 questions to ask when designing with rechargeable batteries for personal care products Jun. 23, 2020
User guides BQ25306 Evaluation Module User's Guide Mar. 23, 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

EVALUATION BOARDS Download
document-generic User guide
49
Description
The BQ25306EVM evaluation module (EVM) is used to evaluate the BQ25306 device. This is a highly integrated 3-A standalone 1-2 cell, 17-V, 1.2-MHz synchronous switch mode buck battery charger, with programmable charge voltage.
Features
  • High efficiency 1.2-MHz synchronous switch mode buck charger
  • Single input to support USB input and adjustable high voltage adapters
  • Input voltage dynamic power management (VINDPM)
  • 1-µA low battery leakage current with adapter unplugged
  • Termination and safety timer disable mode for absent battery
  • This (...)

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WQFN (RTE) 16 View options

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