BQ24295

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I2C controlled 1-cell, 3-A battery charger with USB, adjustable voltage, and 1.5A OTG

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Data sheet

document-pdfAcrobat bq24295 I2C Controlled 3A Single Cell USB Charger With Narrow VDC 4.5-5.5V Adjustable Voltage at 1.5A Synchronous Boost Operation datasheet (Rev. B) PDF | HTML

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BQ25620

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I²C controlled 1-cell 3.5-A buck battery charger with 18-V max input, integrated ADC and OTG output BQ25620 is a wide VIN range and lower quiescent current option.

BQ24295

ACTIVE

Data sheet

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Product details

Number of series cells

1

Charge current (max) (A)

3

Vin (max) (V)

6.2

Cell chemistry

Li-Ion/Li-Polymer

Battery charge voltage (min) (V)

3.5

Battery charge voltage (max) (V)

4.44

Absolute max Vin (max) (V)

15

Control topology

Switch-Mode Buck

Control interface

I2C

Features

BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, USB D+/D-/BC1.2 integrated, USB OTG integrated

Vin (min) (V)

3.9

Rating

Catalog

Operating temperature range (°C)

-40 to 85

Number of series cells

1

Charge current (max) (A)

3

Vin (max) (V)

6.2

Cell chemistry

Li-Ion/Li-Polymer

Battery charge voltage (min) (V)

3.5

Battery charge voltage (max) (V)

4.44

Absolute max Vin (max) (V)

15

Control topology

Switch-Mode Buck

Control interface

I2C

Features

BAT temp thermistor monitoring (hot/cold profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, USB D+/D-/BC1.2 integrated, USB OTG integrated

Vin (min) (V)

3.9

Rating

Catalog

Operating temperature range (°C)

-40 to 85

VQFN (RGE)

24

16 mm² 4 x 4

90% High Efficiency Switch Mode 3-A Charger
3.9-V to 6.2-V Single Input USB-Compliant Charger with 6.4-V Over-Voltage Protection
- USB Host or Charging Port D+/D– Detection Compatible to USB Battery Charger Spec (BC1.2)
- Support Non-Standard 2-A/1-A Adapters Detection
- Input Voltage and Current Limit Supports USB2.0 and USB 3.0
- Input Current Limit: 100 mA, 150 mA, 500 mA, 900 mA, 1 A, 1.5 A, 2 A, and 3 A
Synchronous Boost Converter in Battery Boost Mode with
- Adjustable Output 4.55 V – 5.5 V at 1.5 A
- 90% 5.1-V Boost Mode Efficiency
- Fast OTG Startup (22 ms Typ)
Narrow VDC (NVDC) Power Path Management
- Instant System On with No Battery or Deeply Discharged Battery
- Ideal Diode Operation in Battery Supplement Mode
1.5-MHz Switching Frequency for Low Profile 1.2-mm Inductor
I²C Port for Optimal System Performance and Status Reporting
Autonomous Battery Charging with or without Host Management
- Battery Charge Enable
- Battery Charge Preconditioning
- Charge Termination and Recharge
High Accuracy
- ±0.5% Charge Voltage Regulation
- ±7% Charge Current Regulation
- ±7.5% Input Current Regulation
- ±3% Output Voltage Regulation in Boost Mode
High Integration
- Power Path Management
- Synchronous Switching MOSFETs
- Integrated Current Sensing
- Bootstrap Diode
- Internal Loop Compensation
Safety
- Battery Temperature Sensing for Charging and Discharging in Boost Mode
- Battery Charging Safety Timer
- Thermal Regulation and Thermal Shutdown
- Input and System Over-Voltage Protection
- MOSFET Over-Current Protection
Charge Status Outputs for LED or Host Processor
Maximum Power Tracking Capability by Input Voltage Regulation
20-µA Low Battery Leakage Current and Support Shipping Mode
4mm × 4mm VQFN-24 Package

90% High Efficiency Switch Mode 3-A Charger
3.9-V to 6.2-V Single Input USB-Compliant Charger with 6.4-V Over-Voltage Protection
- USB Host or Charging Port D+/D– Detection Compatible to USB Battery Charger Spec (BC1.2)
- Support Non-Standard 2-A/1-A Adapters Detection
- Input Voltage and Current Limit Supports USB2.0 and USB 3.0
- Input Current Limit: 100 mA, 150 mA, 500 mA, 900 mA, 1 A, 1.5 A, 2 A, and 3 A
Synchronous Boost Converter in Battery Boost Mode with
- Adjustable Output 4.55 V – 5.5 V at 1.5 A
- 90% 5.1-V Boost Mode Efficiency
- Fast OTG Startup (22 ms Typ)
Narrow VDC (NVDC) Power Path Management
- Instant System On with No Battery or Deeply Discharged Battery
- Ideal Diode Operation in Battery Supplement Mode
1.5-MHz Switching Frequency for Low Profile 1.2-mm Inductor
I²C Port for Optimal System Performance and Status Reporting
Autonomous Battery Charging with or without Host Management
- Battery Charge Enable
- Battery Charge Preconditioning
- Charge Termination and Recharge
High Accuracy
- ±0.5% Charge Voltage Regulation
- ±7% Charge Current Regulation
- ±7.5% Input Current Regulation
- ±3% Output Voltage Regulation in Boost Mode
High Integration
- Power Path Management
- Synchronous Switching MOSFETs
- Integrated Current Sensing
- Bootstrap Diode
- Internal Loop Compensation
Safety
- Battery Temperature Sensing for Charging and Discharging in Boost Mode
- Battery Charging Safety Timer
- Thermal Regulation and Thermal Shutdown
- Input and System Over-Voltage Protection
- MOSFET Over-Current Protection
Charge Status Outputs for LED or Host Processor
Maximum Power Tracking Capability by Input Voltage Regulation
20-µA Low Battery Leakage Current and Support Shipping Mode
4mm × 4mm VQFN-24 Package

The bq24295 is a highly-integrated switch-mode battery charge management and system power path management devices for 1 cell Li-Ion and Li-polymer battery in a wide range of power bank, tablet and other portable device applications.

Its low impedance power path optimizes switch-mode operation efficiency, reduces battery charging time and extends battery life during discharging phase. The I²C serial interface with charging and system settings makes the device a truly flexible solution.

The device supports 3.9V – 6.2V USB input sources, including standard USB host port and USB charging port with 6.4V over-voltage protection. The bq24295 is compliant with USB 2.0 and USB 3.0 power specifications with input current and voltage regulation. To set the default input current limit, the bq24295 detects the input source through D+/D– detection following the USB battery charging spec 1.2. In addition, the bq24295 detects non-standard 2A/1A adapters. The bq24295 supports battery boost operation by supplying adjustable voltage 4.55 – 5.5V (default 5.1V) on PMID pin with minimum current of 1.5A.

The power path management regulates the system slightly above battery voltage but does not drop below 3.5V minimum system voltage (programmable). With this feature, the system maintains operation even when the battery is completely depleted or removed. When the input current limit or voltage limit is reached, the power path management automatically reduces the charge current to zero. As the system load continues to increase, the power path discharges the battery until the system power requirement is met. This supplement mode operation prevents overloading the input source.

The devices initiate and complete a charging cycle without software control. It automatically detects the battery voltage and charges the battery in three phases: pre-conditioning, constant current and constant voltage. At the end of the charging cycle, the charger automatically terminates when the charge current is below a preset limit in the constant voltage phase. When the full battery falls below the recharge threshold, the charger will automatically start another charging cycle.

The devices provide various safety features for battery charging and system operation, including negative thermistor monitoring, charging safety timer and over-voltage/over-current protections. The thermal regulation reduces charge current when the junction temperature exceeds 120°C (programmable).

The STAT output reports the charging status and any fault conditions. The INT immediately notifies the host when a fault occurs.

The bq24295 is available in a 24-pin, 4×4 mm² thin VQFN package.