BQ24751B Status: ACTIVE

Multi-Cell Synchronous Switch-mode Charger in 5x5 QFN

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Datasheet

Host-controlled Multi-chemistry Battery Charger w/Sys Power Selector (Rev. A) (PDF 1707 KB)
12 Mar 2009

	BQ24740	BQ24750A	BQ24751B	BQ24753	BQ24753A
# Series Cells	2-4	2-4	2-4	2-4	2-4
Charge Status Outputs	1	1	1	1	1
Control Topology	Switchmode	Switchmode	Switchmode	Switchmode	Switchmode
Switching Frequency(kHz)	300	300	300	300	300
Primary Charge Termination Method	Host Controlled	Host Controlled	Host Controlled	Host Controlled	Host Controlled
Pin/Package	28QFN	28QFN	28QFN	28QFN	28QFN
	Samples	Samples	Samples	Samples	Samples
	Inventory	Inventory	Inventory	Inventory	Inventory

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Product Information

Features

NMOS-NMOS Synchronous Buck Converter with 300 kHz Frequency and >95% Efficiency
30-ns Minimum Driver Dead-time and 99.5% Maximum Effective Duty Cycle
High-Accuracy Voltage and Current Regulation
- ±0.5% Charge Voltage Accuracy
- ±3% Charge Current Accuracy
- ±3% Adapter Current Accuracy
- ±2% Input Current Sense Amp Accuracy
Integration
- Automatic System Power Selection From AC/DC Adapter or Battery
- Internal Loop Compensation
- Internal Soft Start
Safety
- Programmable Input Overvoltage Protection (OVP)
- Dynamic Power Management (DPM) with Status Indicator
- Programmable Inrush Adapter Power (ACOP) and Overcurrent (ACOC) Limits
- Reverse-Conduction Protection Input FET
Supports Two, Three, or Four Li+ Cells
5 - 24 V AC/DC-Adapter Operating Range
Analog Inputs with Ratiometric Programming via Resistors or DAC/GPIO Host Control
- Charge Voltage (4-4.512 V/cell)
- Charge Current (up to 10 A, with 10-m Sense Resistor)
- Adapter Current Limit (DPM)
Status and Monitoring Outputs
- AC/DC Adapter Present with Programmable Voltage Threshold
- Current Drawn from Input Source
Battery Learn Cycle Control
Supports Any Battery Chemistry: Li+, NiCd, NiMH, Lead Acid, etc.
Charge Enable
28-pin, 5x5-mm QFN package
Energy Star Low I_q
- < 10 µA Off-State Battery Discharge Current
- < 1.5 mA Off-State Input Quiescent Current
APPLICATIONS
- Notebook and Ultra-Mobile Computers
- Portable Data Capture Terminals
- Portable Printers
- Medical Diagnostics Equipment
- Battery Bay Chargers
- Battery Back-up Systems

All trademarks are the property of their respective owners.

Description

The bq24751B is a high-efficiency, synchronous battery charger with integrated compensation and system power selector logic, offering low component count for space-constrained multi-chemistry battery charging applications. Ratiometric charge current and voltage programming allows gor high regulation accuracies, and can be either hardwired with resistors or programmed by the system power-management microcontroller using a DAC or GPIOs.

The bq24751B charges two, three, or four series Li+ cells, supporting up to 10 A of charge current, and is available in a 28-pin, 5x5-mm thin QFN package.

The bq24751B controls external switches to prevent battery discharge back to the input, connect the adapter to the system, and to connect the battery to the system using 6-V gate drives for better system efficiency. For maximum system safety, inrush-power limiting provides instantaneous response to high input voltage multiplied by current. This AC Overpower protection (ACOP) feature limits the input-switch power to the programmed level on the ACOP pin, and latches off if the high-power condition persists to prevent overheating.

The bq24751B features Dynamic Power Management (DPM) and input power limiting. These features reduce battery charge current when the input power limit is reached to avoid overloading the AC adapter when supplying the load and the battery charger simultaneously. A highly-accurate current-sense amplifier enables precise measurement of input current from the AC adapter to monitor the overall system power.

Pricing / Packaging / CAD Design Tools / Samples

			Price	Packaging			Samples
Device	Status	Temp (^oC)	Price \| Quantity	Package \| Pins	Top Side Marking	Package QTY \| Package Carrier	Samples
BQ24751BRHDR	ACTIVE	-40 to 125	2.50 \| 1ku	QFN (RHD) \| 28	View	3000 \| LARGE T&R	Purchase Samples
BQ24751BRHDRG4	ACTIVE	-40 to 125	2.50 \| 1ku	QFN (RHD) \| 28	View	3000 \| LARGE T&R	Purchase Samples
BQ24751BRHDT	ACTIVE	-40 to 125	2.75 \| 1ku	QFN (RHD) \| 28	View	250 \| SMALL T&R
BQ24751BRHDTG4	ACTIVE	-40 to 125	2.75 \| 1ku	QFN (RHD) \| 28	View	250 \| SMALL T&R

* Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For higher volume price quotes,prices in local currency or delivery quotes, please contact your local Texas Instruments Sales Office or Authorized Distributor.

Inventory

Reported Distributor Inventory as of 12:06 PM GMT, 08 Nov 2009
Region	Company	In Stock	Purchase
TI Lead Time*: 20 WeeksBQ24751BRHDR
None Reported View Distributors
TI Lead Time*: 20 WeeksBQ24751BRHDRG4
None Reported View Distributors
TI Lead Time*: 20 WeeksBQ24751BRHDT
None Reported View Distributors
TI Lead Time*: 20 WeeksBQ24751BRHDTG4
None Reported View Distributors
View all Distributors

** Lead time information is not available at this time. However, our information is updated daily so please check back with us soon. Please contact your preferred TI Authorized Distributor for additional information.

Quality & Lead (Pb)-Free Data

	Product Content				DPPM / MTBF / FIT Rate
Device	Eco Plan*	Lead / Ball Finish	MSL Rating / Peak Reflow	Details	Details
BQ24751BRHDR	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ24751BRHDRG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ24751BRHDT	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View
BQ24751BRHDTG4	Green (RoHS & no Sb/Br)	CU NIPDAU	Level-2-260C-1 YEAR	View	View

* The planned eco-friendly classification: Pb-Free (RoHS) or Pb-Free (RoHS Exempt) or Green (RoHS & no Sb/Br) - please click on the Product Content Details "View" link in the table above for the latest availability information and additional product content details.

If the information you are requesting is not available online at this time, contact one of our Product Information Centers regarding the availability of this information.

Technical Documents

Most useful technical documents for BQ24751B

Tools & Software

Name	Part #	Company	Tool / Software Type
BQ24751B EVM for Multi Cell Synchronous Notebook Charger and System Power Selector	BQ24751BEVM	Texas Instruments	Development Boards/EVMs
Quick Search Selection Tool for Battery Chargers	BATTERY_CHARGERS_SELECTION_TOOL	Texas Instruments	Free Evaluation Tools

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BQ24751B Status: ACTIVE

Multi-Cell Synchronous Switch-mode Charger in 5x5 QFN

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