text.skipToContent text.skipToNavigation


Standalone 17-V, 3-A single cell and dual cell battery charger

Inventory: 2,456
Limit:  50

Quality information

Lead finish / Ball material Call TI
MSL rating / Peak reflow Call TI
Material content View
DPPM / MTBF / Fit rate View
Qualification summary View
Ongoing reliability monitoring View
Device marking View

Packaging information

Package | Pins Package qty | Carrier Operating temperature range (°C)
WQFN (RTE) | 16 250 | SMALL T&R
-40 to 85
Package | Pins WQFN (RTE) | 16
Package qty | Carrier 250 | SMALL T&R
Operating temperature range (°C) -40 to 85
View TI packaging information

Features for the BQ25306

  • High-efficiency, 1.2-MHz, synchronous switch-mode buck charger
    • 92.5% Charge efficiency at 2 A from 5-V input for1-cell battery
    • 91.5% Charge efficiency at 2 A from 9-Vinput for 1-cell battery
    • 94% Charge efficiency at 2 Afrom 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 rangewith 28-V absolute maximum input voltage rating
    • Input Voltage Dynamic PowerManagement (VINDPM) from 4.0 V up to 1.0834*VBAT – 50 mV
  • High integration
    • Synchronous switching MOSFET
    • Internal lossless input andcharge current sense
    • Internal loop compensation
    • Integratedbootstrap 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 currentregulation
  • Safety
    • Thermal regulation and thermal shutdown
    • Input UnderVoltage Lockout (UVLO) and Over Voltage Protection (OVP)
    • Battery overchargeprotection
    • Safety timer for precharge and fast charge
    • Nocharge at current setting pin ICHG open or short
    • Nocharge at battery feedback pin FB open or short
    • Cold/hot battery temperatureprotection
  • Available in WQFN 3x3-16 package

All trademarks are the property of their respective owners.

Description for the BQ25306

The BQ25306 is a highly-integrated standalone switch-mode batterycharger for single cell and dual cellLi-Ion, Li-polymer, andLiFePO4 batteries. The BQ25306 supports a4.0-V to 17-V input voltagefor fast charging. The device’s sensorless topology enables high charge efficiency and low BOMcost. The device’s best-in-class 1-uA low quiescent current conserves battery energy and maximizesthe shelf time for portable devices. The BQ25306 is available in a 3x3 WQFNpackage 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 ordual batteries in series with charge voltage from 3.4 V to 9.0 V programmable by resistordivider. The device features fast charging for portable devices. Its input voltage andcurrent regulation delivers maximum charging power to the battery. The solution is highlyintegrated with an input reverse-blocking FET (RBFET, Q1), high-side switching FET (HSFET, Q2), andlow-side switching FET (LSFET, Q3).

The BQ25306 features lossless current sensing to reduce power lossand BOM cost with minimized component count. It also integrates a bootstrap diode for the high-sidegate drive and battery temperature monitor to simplify system design. The device initiates a chargeand completes a charging cycle without host control. The BQ25306 chargevoltage and charger current are set by external resistors. The BQ25306 charge voltage is programmed by an externalresister 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 terminatesif the charge current is below the termination current threshold and the battery voltage is abovethe recharge threshold. When the battery voltage falls below the recharge threshold, the chargerwill automatically start another charging cycle. The charger provides various safety features forbattery charging and system operations, including battery temperature monitoring based on negativetemperature coefficient (NTC) thermistor, charge safety timer, input over voltage and over currentprotections, as well as battery over voltage protection. Pin open and short protection is alsobuilt in to protect the charge current setting pin or batteryvoltage feedback pin if accidently opened or shorted to GND. The thermal regulationregulates charge current to limit die temperature during high power operation or high ambienttemperature conditions.

The STAT pin output reports charging status and fault conditions. TheBQ25306 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 deviceautomatically enters a low current HiZ mode with very low battery leakage current to the chargerdevice. The BQ25306 is available in a 3 mm x 3 mm thin WQFN package.


Qty Price (USD)
1-99 2.687
100-249 2.354
250-999 1.651
1,000+ 1.33