BQ24735FRGRT

Battery Chargers Overview

The BQ24735FRGRT is a high-efficiency synchronous battery charger designed for 1 to 4-cell lithium-ion battery applications. It features an SMBus-controlled NMOS-NMOS synchronous buck converter with programmable switching frequencies of 615kHz, 750kHz, and 885kHz. The device supports Turbo Boost mode, allowing simultaneous system power from the adapter and battery during peak loads. It includes internal charge pumps to drive external N-channel MOSFETs for AC, battery, and BATFET selection. Key electrical parameters include a maximum input voltage of 24V, a minimum input voltage of 4.5V, and a battery pack voltage rating of 16.8V.

Battery Chargers Feature Summary

• Supports Intel CPU SmartBoost mode by enabling simultaneous power delivery from both the AC adapter and the battery to handle transient system load spikes.
• Features an SMBus-controlled synchronous buck converter architecture that allows precise programming of input current, charging voltage, and charging current limits via digital registers.
• Integrates internal charge pumps to automatically select and drive external N-channel MOSFETs for optimal system power path management between the adapter and battery sources.

Battery Chargers Applications

• Portable computers and notebooks requiring intelligent power path management
• All-in-one desktop PCs and thin clients
• Industrial equipment with space-constrained battery backup systems

Battery Chargers Procurement Notes

Verify the suffix 'FRGRT' corresponds to the specific tape-and-reel packaging configuration required for your assembly line. Confirm RoHS compliance status and moisture sensitivity level (MSL) ratings prior to PCB placement. Ensure the ordering part number matches the exact temperature range and package dimensions specified in the official Texas Instruments datasheet to avoid compatibility issues.

Battery Chargers Selection Notes

Select this component when designing systems that require dynamic power sharing between the wall adapter and the battery to prevent adapter overload during high-performance computing tasks. It is suitable for applications needing high regulation accuracy for input current and charging parameters managed via a host microcontroller through the SMBus interface.

Battery Chargers Part Context

This part belongs to the BQ2473x family of battery charge controllers from Texas Instruments. It is functionally similar to the BQ24735RGRR but may differ in packaging or reel specifications. The family is characterized by its ability to manage multi-cell Li+ batteries while providing advanced protection features and flexible power path control for portable electronic devices.

Battery Chargers Replacement Considerations

The BQ24735RGRR is a verified substitute within the same product family. Verify that the pinout and thermal characteristics are identical before swapping components in an existing design.

Battery Chargers FAQ

How does the BQ24735FRGRT handle system loads that exceed the AC adapter's capacity?

It utilizes Turbo Boost mode, which allows the battery to discharge simultaneously with the AC adapter to supply the total system power demand, thereby protecting the adapter from overload.

What type of power switches does this controller use?

It uses an NMOS-NMOS synchronous buck converter topology, driven by internal charge pumps that activate external N-channel MOSFETs for the AC, battery, and BATFET paths.