BQ25120A Texas instruments

BQ25120A

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BQ25120A

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Описание

The bq25120A 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. The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows mutliple different configuration options for wake are reset optimization.

Increases System Operation Time Between Charges
- Configurable 300-mA Buck Regulator
  (1.8-V Default)
- 700 nA (typical) Iq with Buck Converter Enabled (No Load)
- Configurable Load Switch or 100mA LDO Output (Load Switch 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 Ship Mode Battery Quiescent Current for Longest Shelf Life
- Battery Charger Operates from 3.4 V – 5.5 V_IN (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
- VINDPM Threshold
- Timer Options
- Load Switch Control
- Controls for Interrupts for Faults and Status
- System Output Voltage Adjustment
- LDO Output Voltage Adjustment

Number of series cells	1
Charge current (max) (A)	0.3
Vin (max) (V)	5.5
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)	20
Control topology	Linear
Control interface	I2C
Features	BAT temp thermistor monitoring (JEITA profile), IC thermal regulation, Input OVP, Integrated LDO, Integrated buck converter, Power Path, VINDPM (Input voltage threshold to maximize adaptor power)
Vin (min) (V)	3.4
Rating	Catalog
Operating temperature range (°C)	-40 to 85