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, pinout, electrical characteristics, absolute maximum ratings.
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 |
Overview
Part: BQ25895, Texas Instruments
Type: Single Cell Li-Ion/Li-Polymer Battery Charger with Boost Converter
Description: The BQ25895 is a highly-integrated 5-A switch-mode battery charge management and system power path management device for single cell Li-Ion and Li-polymer batteries, supporting high input voltage fast charging and boost mode operation with adjustable output from 4.5 V to 5.5 V at up to 3.1 A.
Operating Conditions:
- Supply voltage: 3.9–14 V
- Operating junction temperature: -40 to +125 °C
- Max charge current: 5 A
- Max boost output current: 3.1 A
Absolute Maximum Ratings:
- Max VBUS voltage: 16 V
- Max junction temperature: +150 °C
- Max storage temperature: +150 °C
Key Specs:
- Charge efficiency: 93% at 2 A, 91% at 3 A charge current
- Boost efficiency: 93% at 5 V at 1 A output
- Charge voltage regulation: ±0.5%
- Charge current regulation: ±5%
- Input current regulation: ±7.5%
- Battery discharge MOSFET resistance: 11 mΩ
- Low battery leakage current: 12 μA
- Input current limit range: 100 mA to 3.25 A (with 50-mA resolution)
Features:
- High efficiency 5-A, 1.5-MHz switch mode buck charge
- Boost Mode operation with adjustable output from 4.5 V to 5.5 V, up to 3.1-A output
- Single input to support USB and adjustable high voltage adapters (3.9-V to 14-V input)
- Flexible autonomous and I2C Mode for optimal system performance
- Integrated ADC for system monitor (voltage, temperature, charge current)
- Narrow VDC (NVDC) power path management
Applications:
- Power bank, mobile Wi-Fi hotspot
- Wireless Bluetooth speaker
- Portable internet devices
Package:
- WQFN (24) 4.00mm x 4.00mm
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
Applications
- Power bank, mobile Wi-Fi hotspot
- Wireless Bluetooth speaker
- Portable internet devices
Pin Configuration
BQ25895 WQFN-24 Pinout
| Pin Number | Pin Name | Type | Description |
|---|---|---|---|
| 1 | VBUS | P | Charger Input Voltage. Internal reverse block MOSFET connected between VBUS and PMID. Requires 1-μF ceramic capacitor to PGND placed close to IC. |
| 2 | D+ | AIO | USB data line positive. D+/D- based host/charging port detection (DCD, BC1.2 primary/secondary, MaxCharge). |
| 3 | D- | AIO | USB data line negative. D+/D- based host/charging port detection (DCD, BC1.2 primary/secondary, MaxCharge). |
| 4 | STAT | DO | Open-drain charge status output. LOW = charge in progress; HIGH = charge complete or disabled. Blinks at 1 Hz on fault. Pull-up via 10-kΩ resistor. Disableable via STAT_DIS bit. |
| 5 | SCL | DI | I²C clock. Connect to logic rail via 10-kΩ resistor. |
| 6 | SDA | DIO | I²C data. Connect to logic rail via 10-kΩ resistor. |
| 7 | INT | DO | Open-drain interrupt output. Active-low 256-μs pulse to host. Pull-up via 10-kΩ resistor. |
| 8 | OTG | DI | Boost mode enable. Activates when OTG_CONFIG=1, OTG pin high, and no input source at VBUS. |
| 9 | CE | DI | Active-low Charge Enable. Battery charging enabled when CHG_CONFIG=1 and CE=Low. Must be pulled high or low. |
| 10 | ILIM | AI | Input current limit control. Sets maximum input current via resistor divider to ground (I_INMAX = K_ILIM / R_ILIM at 0.8V regulation). Minimum 500 mA supported. Also monitors input current when voltage <0.8V. Disableable via EN_ILIM bit. |
| ? | (Pins 11–24) | ? | Not listed in provided datasheet section. |
Notes
- Incomplete pinout: The provided datasheet section only documents pins 1–10. Pins 11–24 are not described in the extracted text.
- Pin numbering source: Pin numbers 1–10 are taken directly from the "PIN NO." column in Table 6-1. A pin diagram image reference is present but the image itself was not provided; pin numbers for pins 11–24 cannot be determined from the text alone.
- SDA pin number missing: The table row for SDA (pin 6) is missing the PIN NO. entry in the source; pin 6 is inferred from sequential position but should be verified against the actual package diagram.
- Type abbreviations: P = Power, AIO = Analog Input/Output, DO = Digital Output, DI = Digital Input, DIO = Digital Input/Output, AI = Analog Input.
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 |
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 |
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 |
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 | °C/W |
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.
Ordering Information
| MPN | Package | Temperature Range | Packing |
|---|---|---|---|
| BQ25895 | WQFN (24) | -40°C to +125°C | null |
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| BQ25895RTWR | Texas Instruments | 24-WFQFN Exposed Pad |
| BQ25895RTWR.A | Texas Instruments | — |
| BQ25895RTWRG4 | Texas Instruments | — |
| BQ25895RTWT | Texas Instruments | 24-WFQFN Exposed Pad |
| BQ25895RTWT.A | Texas Instruments | — |
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