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reference designBQ25122

Texas Instruments BQ25122

300-mA linear battery charger with Power Path, integrated LDO and buck converter 1.2V default output

Overview

TopologyOther Topology
Switching frequency2000 kHz

Description

The bq25122 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents. The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

Features

  • Increases System Operation Time Between Charges
  • Configurable 300-mA Buck Regulator (1.2-V Default)
  • 700 nA (typical) Iq with Buck Converter Enabled (No Load)
  • Configurable Load Switch or 100mA LDO Output (Load Switch enabled by default)
  • Up to 300-mA Charge Current for Fast Charging
  • 0.5% Accurate Battery Voltage Regulation (Configurable from 3.6 V to 4.65 V in 10-mV Steps)
  • Configurable Termination Current Down to 500 µA
  • Simple Voltage Based Battery Monitor
  • Highly Integrated Solution with Small Footprint
  • 2.5 mm x 2.5 mm WCSP Package and 6 External Components for Minimal Solution
  • Push-Button Wake-Up and Reset with Adjustable Timers
  • Power Path Management for Powering the System and Charging the Battery
  • Power Path Management enables < 50 nA 150 nA Ship Mode Battery Quiescent Current for Longest Shelf Life
  • Battery Charger Operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V Tolerant)
  • Dedicated Pins for Input Current Limit, Charge Current, Termination Current, and Status Output
  • I2C Communication Control
  • Charge Voltage and Current
  • Termination Threshold
  • Input Current Limit
  • Load Switch Control
  • Controls for Interrupts for Faults and Status
  • System Output Voltage Adjustment
  • LDO Output Voltage Adjustment
  • Safety-Related Certification:
  • TUV IEC 62368-1 Certification

Typical applications

  • Hearing Aids, Hearables, Smart Watches, and other Wearable Devices, Rechargeable Toys
  • Fitness Accessories, Health Monitoring Medical Accessories

More information

Products

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Data­sheet
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Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
fres(MHz)
VOP(V)
Mount
SamplesAvailability & Sample
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74438343022
SPECWE-MAPI SMT Power Inductor, 2.2 µH, 1.65 A
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Downloads10 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-MAPI SMT Power Inductor
Inductance2.2 µH
Performance Rated Current1.65 A
Saturation Current @ 30%3.3 A
DC Resistance225 mΩ
Self Resonant Frequency70 MHz
Operating Voltage80 V
MountSMT 
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