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Texas Instruments bq24800 Buck Battery Charge Controller

Texas Instruments bq24800 1- to 4-Cell Buck Battery Charge Controller is a high-efficiency, synchronous buck battery charger, offering low component count for space-constrained, multi-chemistry battery charging applications. The Texas Instruments bq24800 device supports hybrid power boost mode. Hybrid power boost mode boosts the battery up to the system voltage to supplement the adapter when system power demand is temporarily higher than the adapter can provide. The ultra-fast transition from battery charging to battery discharging prevents adapter crashes from an overloading condition.

The bq24800 device also supports battery only boost mode when no adapter is present. When the battery voltage is above the minimum system operation voltage, the battery is directly connected to the system supply rail through BATFET. Once the battery voltage goes below the minimum system operation voltage, bq24800 will turn on the boost mode to regulate the system supply rail, extending the system run time.

Features

Hybrid Power Boost Mode to power-up system from adapter and battery together
- Ultra-fast transient response of 150μs to enter Hybrid Power Boost Mode
Battery Only Boost Mode to extend battery run time
Peak power two-level input current limit to maximize the power from the adapter and minimize battery discharge
Charge 1- to 4-cell battery pack from 4.5V to 24V adapter
High accuracy power and current monitoring for CPU throttling
- Comprehensive PROCHOT profile
- ±2% Current monitor accuracy
- ±5% System Power Monitor Accuracy (PMON)
Automatic NMOS power source selection from adapter or battery
- ACFET Fast turn on in 100μs when exiting learn mode from battery removal
Programmable input current, charge voltage, charge, and discharge current limit
- ±0.4% charge voltage (16mV/step)
- ±2% input current (64mA/step)
- ±2% charge current (64mA/step)
- ±2% discharge current (512mA/step)

High integration
- Battery LEARN function
- Battery present monitor
- Boost Mode indicator
- Loop compensation
- BTST Diode
Enhanced safety features for over-voltage protection, over-current protection, battery, inductor, and MOSFET short-circuit protection
300kHz, 400kHz, 600kHz, and 800kHz switching frequency
Realtime system control on ILIM pin to limit charge and discharge current
0.65mA Adapter standby quiescent current for Energy Star

Applications

Notebook, ultrabook, detachable, and tablet PC
Industrial and medical equipment

A system with battery backup
Portable equipment

Texas Instruments bq24800 Buck Battery Charge Controller

Features

Applications

Block Diagram

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