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BQ25185

ACTIVE

1-cell, 1-A stand-alone linear battery charger with power path and solar input support

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Data sheet

BQ25185

ACTIVE
Data sheet Order now

Product details

Number of series cells 1 Charge current (max) (A) 1 Vin (max) (V) 25 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (min) (V) 3.6 Battery charge voltage (max) (V) 4.65 Absolute max Vin (max) (V) 25 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 3 Rating Catalog Operating temperature range (°C) -40 to 125
Number of series cells 1 Charge current (max) (A) 1 Vin (max) (V) 25 Cell chemistry Li-Ion/Li-Polymer, Lithium Phosphate/LiFePO4 Battery charge voltage (min) (V) 3.6 Battery charge voltage (max) (V) 4.65 Absolute max Vin (max) (V) 25 Control topology Linear Control interface Standalone (RC-Settable) Features BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, IINDPM (Input current limit), Input OVP, Power Path, VINDPM (Input voltage threshold to maximize adaptor power) Vin (min) (V) 3 Rating Catalog Operating temperature range (°C) -40 to 125
WSON (DLH) 10 4.4 mm² 2.2 x 2
  • 1-A linear battery charger
    • 3.0-V to 18-V input voltage operating range
    • 25-V tolerant input voltage
    • External resistor programmable operation:
      • ILIM/VSET sets battery regulation voltage to 3.6V, 3.65 V, 4.02 V, 4.1V, 4.2 V, 4.35 V, or 4.4 V
      • ILIM/VSET sets input current limit to 100 mA, 500 mA, or 1100 mA
      • ISET to set charge current from 5 mA to 1 A
    • Li-ion, Li-Poly, and LiFePO4 chemistries support
    • 115-mΩ battery FET ON resistance
    • Up to 3.125-A discharge current to support high system loads
  • Power path management for powering the system and charging the battery
    • Regulated system voltage (SYS) at 4.5 V
    • Configurable input current limit
    • USB Suspend mode supported
    • Battery Tracking input voltage dynamic power management (VINDPM) for high impedance input sources
    • Dynamic power path management optimizes charging from weak adapters
  • Ultra low quiescent current
    • 4-µA in Battery Only mode
    • 30-µA Input adapter Iq in sleep mode
    • 3.2-µA Battery discharge current in Factory Mode
  • Integrated fault protection
    • Input overvoltage protection (VIN_OVP)
    • Battery undervoltage protection (BUVLO)
    • Battery short protection (BATSC)
    • Battery overcurrent protection (BATOCP)
    • Input current limit protection (ILIM)
    • Thermal regulation (TREG) and thermal shutdown (TSHUT)
    • Battery thermal fault protection (TS)
    • Safety timer fault
    • ISET and ILIM/VSET pin short/open protection.
  • 1-A linear battery charger
    • 3.0-V to 18-V input voltage operating range
    • 25-V tolerant input voltage
    • External resistor programmable operation:
      • ILIM/VSET sets battery regulation voltage to 3.6V, 3.65 V, 4.02 V, 4.1V, 4.2 V, 4.35 V, or 4.4 V
      • ILIM/VSET sets input current limit to 100 mA, 500 mA, or 1100 mA
      • ISET to set charge current from 5 mA to 1 A
    • Li-ion, Li-Poly, and LiFePO4 chemistries support
    • 115-mΩ battery FET ON resistance
    • Up to 3.125-A discharge current to support high system loads
  • Power path management for powering the system and charging the battery
    • Regulated system voltage (SYS) at 4.5 V
    • Configurable input current limit
    • USB Suspend mode supported
    • Battery Tracking input voltage dynamic power management (VINDPM) for high impedance input sources
    • Dynamic power path management optimizes charging from weak adapters
  • Ultra low quiescent current
    • 4-µA in Battery Only mode
    • 30-µA Input adapter Iq in sleep mode
    • 3.2-µA Battery discharge current in Factory Mode
  • Integrated fault protection
    • Input overvoltage protection (VIN_OVP)
    • Battery undervoltage protection (BUVLO)
    • Battery short protection (BATSC)
    • Battery overcurrent protection (BATOCP)
    • Input current limit protection (ILIM)
    • Thermal regulation (TREG) and thermal shutdown (TSHUT)
    • Battery thermal fault protection (TS)
    • Safety timer fault
    • ISET and ILIM/VSET pin short/open protection.

The BQ25185 is a linear battery charger IC focusing on small solution size and low quiescent current for extending battery life. The device is available in a leadless, small package with a thermal pad giving thermal performance. The device can support up to 1-A charging and system loads of up to 3.125 A.

The battery is charged using a standard Li-ion or LiFePO4 charge profile with three phases: precharge, constant current and constant voltage. Thermal regulation provides the maximum charge current while managing the device temperature. The charger is also optimized for battery to battery charging with 3-V minimum input voltage operation and can withstand 25-V absolute maximum line transients. The device integrates a single push-button input to reduce the total solution footprint.

The BQ25185 is a linear battery charger IC focusing on small solution size and low quiescent current for extending battery life. The device is available in a leadless, small package with a thermal pad giving thermal performance. The device can support up to 1-A charging and system loads of up to 3.125 A.

The battery is charged using a standard Li-ion or LiFePO4 charge profile with three phases: precharge, constant current and constant voltage. Thermal regulation provides the maximum charge current while managing the device temperature. The charger is also optimized for battery to battery charging with 3-V minimum input voltage operation and can withstand 25-V absolute maximum line transients. The device integrates a single push-button input to reduce the total solution footprint.
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Technical documentation

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Type Title Date
* Data sheet BQ25185 1-Cell, 1-A Standalone Linear Battery Charger with Power Path, Factory Mode, and Battery Tracking VINDPM datasheet PDF | HTML 23 Oct 2023
Certificate BQ25185EVM EU Declaration of Conformity (DoC) 26 Oct 2023
EVM User's guide BQ25185 EVM User's Guide PDF | HTML 20 Oct 2023

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Evaluation board

BQ25185EVM — BQ25185 evaluation module for 1-cell, 1-A stand-alone linear battery charger

The BQ25185 evaluation model (EVM) is designed to evaluate and test various operating modes of the BQ25185. The EVM is designed for a complete test friendly evaluation with visual indicators. The BQ25185 is an integrated battery charge management IC that integrates most common functions for solar (...)

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