BQ25895
I2C Controlled Single Cell 5-A Fast Charger with MaxChargeTM for High Input Voltage and Adjustable Voltage 3.1-A Boost OperationThe BQ25895 is a i2c controlled single cell 5-a fast charger with maxchargetm for high input voltage and adjustable voltage 3.1-a boost operation from Texas Instruments. View the full BQ25895 datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
Official BQ25895 datasheet (PDF) — the source this page was extracted from.
BQ25895 Key Specifications
| Parameter | Value |
|---|---|
| Charge Current | 5A |
| Boost Efficiency | 93% at 5V, 1A output |
| Charge Efficiency | 93% at 2A, 91% at 3A |
| Package Dimensions | 4.00mm x 4.00mm |
| Input Voltage Range | 3.9V to 14V |
| Switching Frequency | 1.5MHz (buck), 500kHz to 1.5MHz (boost selectable) |
| Boost Output Current | 3.1A |
| Communication Interface | I2C |
| Battery Discharge Current | Up to 9A |
| Input Current Limit Range | 100mA to 3.25A |
| Boost Output Voltage Range | 4.5V to 5.5V |
| Low Battery Leakage Current | 12µA |
| Charge Current Regulation Accuracy | ±5% |
| Charge Voltage Regulation Accuracy | ±0.5% |
| Operating Junction Temperature Range | -40°C to 150°C |
BQ25895 Overview
Part: BQ25895 — Texas Instruments
Type: I²C-Controlled Single-Cell Li-Ion Switch-Mode Battery Charger with Power Path Management and Boost Mode
Description: 3.9–14 V input, 5 A single-cell fast charger with 1.5 MHz switching, MaxCharge high-voltage adapter support, and an adjustable 4.5–5.5 V boost output of up to 3.1 A.
Operating Conditions:
- Supply voltage (VIN): 3.9–14 V
- Operating temperature: -40 °C minimum
- Input current limit: 100 mA to 3.25 A in 50 mA steps
- Battery discharge current through internal MOSFET: up to 6 A continuous
Absolute Maximum Ratings:
- VBUS: -2 to 22 V (converter not switching)
- PMID: -0.3 to 22 V (converter not switching)
- SW: -2 to 16 V (-3 to 16 V peak for 10 ns)
- BAT, SYS: -0.3 to 6 V (converter not switching)
- SDA, SCL, INT, OTG, REGN, TS, CE, QON: -0.3 to 7 V
- INT, STAT output sink current: 6 mA
- Junction temperature: -40 to 150 °C
- Storage temperature: -65 to 150 °C
Key Specs:
- Charge efficiency: 93% at 2 A, 91% at 3 A
- Boost efficiency: 93% at 5 V, 1 A output
- Boost output: 4.5–5.5 V adjustable, up to 3.1 A, selectable 500 kHz to 1.5 MHz
- Charge voltage accuracy: ±0.5%
- Charge current accuracy: ±5%
- Input current regulation accuracy: ±7.5%
- Battery discharge MOSFET: 11 mΩ, up to 9 A
- Battery leakage current in Ship Mode: 12 μA
Features:
- High-efficiency 5 A, 1.5 MHz switch-mode buck charger with low-power PFM mode
- Boost mode with integrated charge/boost switching control
- Single input supports USB and adjustable high-voltage adapters (MaxCharge via D+/D- and DSEL)
- Auto-detection of USB SDP, CDP, DCP, and nonstandard adapters
- Input Current Optimizer (ICO) and maximum power tracking via input voltage limit up to 14 V
- IR compensation from charger output to cell terminal
- Integrated ADC for voltage, temperature, and charge current monitoring
- Narrow VDC (NVDC) power path with instant-on and ideal diode operation in Battery Supplement Mode
- BATFET control for Ship Mode, wake-up, and full system reset
- Integrated MOSFETs, current sensing, and loop compensation
- Battery temperature sensing, thermal regulation, and thermal shutdown
- I²C slave address 0x6A
Applications:
- Power bank, mobile Wi-Fi hotspot
- Wireless Bluetooth speaker
- Portable internet devices
Package:
- WQFN (24), 4.00 mm × 4.00 mm (RTW)
BQ25895 Features
- High efficiency 5-A, 1.5-MHz switch mode buck charge
- -93% Charge efficiency at 2 A and 91% charge efficiency at 3 A charge current
- -Optimize for high voltage input (9 V to 12 V)
- -Low Power PFM Mode for light load operations
- Boost Mode operation with adjustable output from 4.5 V to 5.5 V
- -Selectable 500-KHz to 1.5-MHz boost converter with up to 3.1-A output
- -93% Boost efficiency at 5 V at 1 A output
- Integrated control to switch between charge and Boost Mode
- Single input to support USB input and adjustable high voltage adapters
- -Support 3.9-V to 14-V input voltage range
- -Input current limit (100 mA to 3.25 A with 50-mA resolution) to support USB2.0, USB3.0 standard and high voltage adapters
- -Maximum power tracking by input voltage limit up-to 14V for wide range of adapters
- -Auto detect USB SDP, CDP, DCP, and Nonstandard Adapters
- Input current optimizer (ICO) to maximize input power without overloading adapters
- Resistance compensation (IRCOMP) from charger output to cell terminal
- Highest battery discharge efficiency with 11-mΩ battery discharge MOSFET up to 9 A
- Integrated ADC for system monitor (voltage, temperature, charge current)
- Narrow VDC (NVDC) power path management
- -Instant-on works with no battery or deeply discharged battery
- -Ideal diode operation in Battery Supplement Mode
- BATFET Control to support Ship Mode, wake up, and full system reset
- Flexible autonomous and I 2 C Mode for optimal system performance
- High integration includes all MOSFETs, current sensing and loop compensation
- 12-μA Low battery leakage current to support Ship Mode
- High accuracy
- -±0.5% Charge voltage regulation
- -±5% Charge current regulation
- -±7.5% Input current regulation
- Safety
- -Battery temperature sensing for charge and Boost Mode
- -Thermal regulation and thermal shutdown
BQ25895 Applications
- Power bank, mobile Wi-Fi hotspot
- Wireless Bluetooth speaker
- Portable internet devices
BQ25895 Pin Configuration
Figure 6-1. BQ25895 RTW (WQFN) Top View
Table 6-1. Pin Functions
| PIN - NAME | PIN - NO. | TYPE (1) | DESCRIPTION |
|---|---|---|---|
| VBUS | 1 | P | Charger Input Voltage. The internal n-channel reverse block MOSFET (RBFET) is connected between VBUS and PMID with VBUS on source. Place a 1-μF ceramic capacitor from VBUS to PGND and place it as close as possible to IC. |
| D+ | 2 | AIO | Positive line of the USB data line pair. D+/D- based USB host/charging port detection. The detection includes data contact detection (DCD), primary and secondary detection in BC1.2, and Adjustable high voltage adapter (MaxCharge). |
| D- | 3 | AIO | Negative line of the USB data line pair. D+/D- based USB host/charging port detection. The detection includes data contact detection (DCD), primary and secondary detection in BC1.2, and Adjustable high voltage adapter (MaxCharge). |
| STAT | 4 | DO | Open drain charge status output to indicate various charger operation. Connect to the pull up rail via 10-kΩ resistor. LOW indicates charge in progress. HIGH indicates charge complete or charge disabled. When any fault condition occurs, STAT pin blinks in 1 Hz. The STAT pin function can be disabled when STAT_DIS bit is set. |
| SCL | 5 | DI | I 2 C Interface clock. Connect SCL to the logic rail through a 10-kΩ resistor. |
| SDA | DIO | I 2 C Interface data. Connect SDA to the logic rail through a 10-kΩ resistor. | |
| INT | 7 | DO | Open-drain Interrupt Output. Connect the INT to a logic rail via 10-kΩ resistor. The INT pin sends active low, 256-μs pulse to host to report charger device status and fault. |
| OTG | 8 | DI | Boost mode enable pin. The boost mode is activated when OTG_CONFIG =1, OTG pin is high, and no input source is detected at VBUS |
| CE | 9 | DI | Active low Charge Enable pin. Battery charging is enabled when CHG_CONFIG = 1 and CE pin = Low. CE pin must be pulled High or Low. |
| ILIM | 10 | AI | Input current limit Input. ILIM pin sets the maximum input current and can be used to monitor input current ILIM pin sets the maximum input current limit by regulating the ILIM voltage at 0.8 V. A resistor is connected from ILIM pin to ground to set the maximum limit as I INMAX = K ILIM /R ILIM . The actual input current limit is the lower limit set by ILIM pin (when EN_ILIM bit is high) or IIINLIM register bits. Input current limit of less than 500 mA is not support on ILIM pin. ILIM pin can also be used to monitor input current when the voltage is below 0.8V. The input current is proportional to the voltage on ILIM pin and can be calculated by I IN = (K ILIM x V ILIM ) / (R ILIM x 0.8) The ILIM pin function can be disabled when EN_ILIM bit is 0. |
Table 6-1. Pin Functions
BQ25895 Electrical Characteristics
VVBUS_UVLOZ < VVBUS < VACOV and VVBUS > VBAT + VSLEEP, TJ = -40°C to +125°C and TJ = 25°C for typical values (unless otherwise noted)
| PARAMETER | PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS V BAT = 4.2 V, V (VBUS) < V (UVLO) , leakage between BAT and VBUS | QUIESCENT CURRENTS | QUIESCENT CURRENTS | QUIESCENT CURRENTS 5 | QUIESCENT CURRENTS μA |
| I BAT | Battery discharge current (BAT, SW, SYS) in buck mode | High-Z mode, no VBUS, BATFET disabled (REG09[5]=1), battery monitor disabled, T J < 85°C | 12 | 23 | μA | |
| High-Z mode, no VBUS, BATFET enabled (REG09[5]=0), battery monitor disabled, T J < 85°C | 32 | 60 | μA | |||
| I (VBUS_HIZ) | Input supply current (VBUS) in buck mode when High-Z mode is enabled | V (VBUS) = 5 V, High-Z mode, no battery, battery monitor disabled | 15 | 35 | μA | |
| V (VBUS) = 12 V, High-Z mode, no battery, battery monitor disabled | 25 | 50 | μA | |||
| I (VBUS) | Input supply current (V BUS ) in buck mode | V BUS > V (UVLO) , V BUS > V BAT , converter not switching V BUS > V (UVLO) , V BUS > V BAT , converter switching, V BAT = 3.2 V, I SYS = 0A V BUS > V (UVLO) , V BUS > V BAT , converter switching, V BAT = 3.8 V, I SYS = 0 A | 1.5 3 3 | 3 | mA mA mA | |
| I (BOOST) | Battery discharge current in boost mode | V BAT = 4.2 V, boost mode, I (VBUS) = 0 A, converter switching | 5 | mA | ||
| VBUS/BAT POWER UP | VBUS/BAT POWER UP | VBUS/BAT POWER UP | VBUS/BAT POWER UP | VBUS/BAT POWER UP | VBUS/BAT POWER UP | VBUS/BAT POWER UP |
| V (VBUS_OP) | VBUS operating range | 3.9 | 14 | V | ||
| V (VBUS_UVLOZ) | VBUS for active I 2 C, no battery | 3.6 | V | |||
| V (SLEEP) | Sleep mode falling threshold | 25 | 65 | 120 | mV | |
| V (SLEEPZ) | Sleep mode rising threshold | 130 | 250 | 370 | mV | |
| V | VBUS over-voltage rising threshold | 14 | 14.6 | V | ||
| (ACOV) | VBUS over-voltage falling threshold | 13.5 | 14 | V | ||
| V BAT(UVLOZ) | Battery for active I2C, no VBUS | 2.3 | V | |||
| V BAT(DPL) | Battery depletion falling threshold | 2.15 | 2.5 | V | ||
| V BAT(DPLZ) | Battery depletion rising threshold | 2.35 | 2.7 | V | ||
| V (VBUSMIN) | Bad adapter detection threshold | 3.8 | V | |||
| I (BADSRC) | Bad adapter detection current source | 30 | mA | |||
| POWER-PATH MANAGEMENT | POWER-PATH MANAGEMENT | POWER-PATH MANAGEMENT | POWER-PATH MANAGEMENT | POWER-PATH MANAGEMENT | POWER-PATH MANAGEMENT | POWER-PATH MANAGEMENT |
| V SYS | Typical system regulation voltage | I (SYS) = 0 A, V BAT > V SYS(MIN) , BATFET Disabled (REG09[5]=1) | V BAT + 50 mV | V | ||
| I (SYS) = 0 A, V BAT < V SYS(MIN) , BATFET Disabled (REG09[5]=1) | V SYS(MIN) 150 | + mV | V | |||
| V SYS(MIN) | Minimum DC system voltage output | V BAT < V SYS(MIN) , SYS_MIN = 3.5 V (REG03[3:1]=101), I SYS = 0 A | 3.50 | 3.65 | V | |
| V SYS(MAX) | Maximum DC system voltage output | V BAT = 4.35 V, SYS_MIN = 3.5V (REG03[3:1]=101), I SYS = 0 A | 4.40 | 4.42 | V |
BQ25895 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)
| MIN | MAX | VALUE | ||
|---|---|---|---|---|
| Voltage range (with respect to GND) | VBUS (converter not switching) | -2 | 22 | V |
| Voltage range (with respect to GND) | PMID (converter not switching) | -0.3 | 22 | V |
| Voltage range (with respect to GND) | STAT | -0.3 | 20 | V |
| Voltage range (with respect to GND) | DSEL | -0.3 | 20 | V |
| Voltage range (with respect to GND) | BTST | -0.3 | 20 | V |
| Voltage range (with respect to GND) | SW | -2 | 16 | V |
| Voltage range (with respect to GND) | SW (peak for 10 ns duration) | -3 | 16 | V |
| Voltage range (with respect to GND) | BAT, SYS (converter not switching) | -0.3 | 6 | V |
| Voltage range (with respect to GND) | SDA, SCL, INT, OTG, REGN, TS, CE, QON | -0.3 | 7 | V |
| Voltage range (with respect to GND) | D+, D- | -0.3 | 7 | V |
| Voltage range (with respect to GND) | BTST TO SW | -0.3 | 7 | V |
| Voltage range (with respect to GND) | PGND to GND | -0.3 | 0.3 | V |
| Voltage range (with respect to GND) | ILIM | -0.3 | 5 | V |
| Output sink current | INT, STAT | 6 | mA | |
| Output sink current | DSEL | 6 | mA | |
| Junction temperature | -40 | 150 | °C | |
| Storage temperature range, T stg | -65 | 150 | °C |
BQ25895 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | NOM | UNIT | ||
|---|---|---|---|---|
| V IN | Input voltage | 3.9 | 14 | V |
| I IN | Input current (VBUS) | A | ||
| I SYS | Output current (SW) | A | ||
| V BAT | Battery voltage | V | ||
| I BAT | Fast charging current | A | ||
| I BAT | Discharging current with internal MOSFET | Up to 6 (continuos) | A | |
| I BAT | Discharging current with internal MOSFET | (Up to 1 sec | A | |
| T A | Operating free-air temperature range | -40 | °C |
BQ25895 Thermal Information
| THERMAL METRIC (1) | THERMAL METRIC (1) | BQ25895 RTW (WQFN) 24-PINS | UNIT |
|---|---|---|---|
| R θJA | Junction-to-ambient thermal resistance | 31.8 | °C/W |
| R θJC((op) | Junction-to-case (top) thermal resistance | 27.9 | °C/W |
| R θJB | Junction-to-board thermal resistance | 8.7 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 0.3 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 8.7 | °C/W |
| R θJC(bot) | Junction-to-case (bottom) thermal resistance | 2.0 | °C/W |
BQ25895 Typical Application
A typical application consists of the device configured as an I 2 C controlled power path management device and a single cell battery charger for Li-Ion and Li-polymer batteries used in a wide range of smartphones and other portable devices. It integrates an input reverse-block FET (RBFET, Q1), high-side switching FET (HSFET, Q2), low-side switching FET (LSFET, Q3), and BATFET (Q4) between the system and battery. The device also integrates a bootstrap diode for the high-side gate drive.
More part numbers on this datasheet
Their pages show this same datasheet. Some are linked through their part family rather than checked part by part, so confirm the exact part in the ordering information.
Other Interface ICs
- TCA6424ARGJR – Texas Instruments, I2C and SMBus I/O Expander
- CH340N – WCH, USB to Serial Bridge IC
- ADM3053BRWZ – Analog Devices, Signal and Power Isolated CAN Transceiver
- ADM3053BRWZ-REEL7 – Analog Devices, Signal and Power Isolated CAN Transceiver
- BQ25895RTWR.A – Texas Instruments, I2C Controlled Single Cell 5-A Fast Charger with MaxChargeTM for High Input Voltage and Adjustable Voltage 3.1-A Boost Operation
- CH334 – WCH, 4-Port USB 2.0 Hub Controller
- CH334P – WCH, 4-Port USB 2.0 Hub Controller
- CH334R – WCH, 4-Port USB 2.0 Hub Controller
All Interface ICs datasheetsAll Texas Instruments datasheets (2,442)
Data on this page is extracted from publicly available manufacturer datasheets using automated tools including AI. It may contain errors or omissions. Always verify specifications against the official manufacturer datasheet before making design or purchasing decisions. See our Terms of Service. Rights holders can submit a takedown request.
Ask your AI agent about the BQ25895
Connect SheetsData to Claude, Cursor, Codex or any MCP client and your agent reads this datasheet for you: pinout, limits, register maps and design checks, with the numbers taken from the PDF.
claude mcp add --transport http sheetsdata https://mcp.sheetsdata.com/mcp
Then ask: "Can the BQ25895 run from my 12 V rail? Check it against the datasheet limits."
Create a free account $2 of usage every month, no card needed.