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bq24765 Datasheet

SMBus-Controlled Multi-Chemistry Battery Charger

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bq24765
SLUS999A – NOVEMBER 2009 – REVISED NOVEMBER 2015
bq24765 SMBus-Controlled Multi-Chemistry Battery Charger With Integrated Power
MOSFETs
1 Features
• Integrated Power MOSFETs, NMOS-NMOS,
Synchronous Buck Converter
• >95% Efficiency
• Frequency 700kHz Allows Smaller Inductor (5 mm
x 5 mm)
• Thermal Regulation Loop for Safety, Limit TJ =
120°C
• Adaptive 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
– Integrated Power MOSFETs
– Input Current Comparator
– Internal Soft-Start
• Safety
– Thermal Regulation Loop and Thermal
Shutdown
– Dynamic Power Management (DPM)
– Power FETs Over Current Protection
• 7 V–24 V AC/DC-Adapter Operating Range
• Simplified SMBus Control
– Charge Voltage DAC (1.024 V–19.2 V)
– Charge Current DAC (128 mA–8.064 A)
– Adapter Current Limit DPM DAC (256
mA–11.008 A)
• Status and Monitoring Outputs
– AC/DC Adapter Present With Adjustable
Voltage Threshold
– Input Current Comparator, With Adjustable
Threshold and Hysteresis
– Current Sense Amplifier for Current Drawn
From Input Source
• Charge Any Battery Chemistry: Li+, LiFePO4,
NiCd, NiMH, Lead Acid (2, 3, and 4 Li-Ion Cells)
• Charge Enable Pin (CE)
• Energy Star Low Iq
– < 10-μA Battery Current with Adapter
Removed
– < 1 mA Input DCINA Current When Adapter
1
Present and Charge Disabled
• 34-pin, 3.50 mm × 7.00 mm QFN Package
2 Applications
• Notebook and Ultra-Mobile Computers
• Portable Data-Capture Terminals
• Portable Printers
• Medical Diagnostics Equipment
• Battery Bay Chargers
• Battery Back-up Systems
3 Description
The bq24765 is a high-efficiency, synchronous
battery charger with two integrated 30-mΩ NMOS
power MOSFETs, and an integrated input current
comparator, offering low component count for space-
constraint, multi-chemistry battery charging
applications. Input current, charge current, and
charge voltage DACs allow for very high regulation
accuracies that can be easily programmed by the
system power management micro-controller using
SMBus. The bq24765 has switching frequency of 700
kHz. The bq24765 charges 2, 3, or 4 series Li+ cells,
and is available in a 34-pin, 3.50 mm x 7.00 mm
VQFN package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24765
VQFN (34)
3.50 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
ADAPTER
SMBUS
Host GPIO
ADC
Control by
host
CSSP CSSN DCINA
ACIN
ICREF
DCINP
PHASE
BOOT
VDDSMB
VREF
AGND
SDA
SCL
ADDP
PGND
CSOP
CSON
VFB
CE
ACOK
ICOUT
VICM
PowerPad
EAO
EAI
FBO
Control by
host
SYSTEM
Battery
pack
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.




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bq24765 Datasheet Preview

bq24765 Datasheet

SMBus-Controlled Multi-Chemistry Battery Charger

No Preview Available !

bq24765
SLUS999A – NOVEMBER 2009 – REVISED NOVEMBER 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Description (Continued) ........................................ 3
6 Pin Configuration and Functions ......................... 3
7 Specifications......................................................... 5
7.1 Absolute Maximum Ratings ...................................... 5
7.2 ESD Ratings.............................................................. 5
7.3 Recommended Operating Conditions....................... 6
7.4 Thermal Information .................................................. 6
7.5 Electrical Characteristics........................................... 7
7.6 SMB Timing Requirements ..................................... 10
7.7 Typical Characteristics ............................................ 12
8 Detailed Description ............................................ 14
8.1 Overview ................................................................. 14
8.2 Functional Block Diagram ....................................... 15
8.3 Feature Description................................................. 16
8.4 Device Functional Modes........................................ 21
8.5 Programming........................................................... 21
8.6 Register Maps ......................................................... 25
9 Application and Implementation ........................ 28
9.1 Application Information............................................ 28
9.2 Typical Application ................................................. 28
10 Power Supply Recommendations ..................... 33
11 Layout................................................................... 33
11.1 Layout Guidelines ................................................. 33
11.2 Layout Example .................................................... 34
12 Device and Documentation Support ................. 35
12.1 Device Support...................................................... 35
12.2 Documentation Support ........................................ 35
12.3 Community Resources.......................................... 35
12.4 Trademarks ........................................................... 35
12.5 Electrostatic Discharge Caution ............................ 35
12.6 Glossary ................................................................ 35
13 Mechanical, Packaging, and Orderable
Information ........................................................... 36
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (November 2009) to Revision A
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
• Deleted Ordering Information table ....................................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: bq24765
Copyright © 2009–2015, Texas Instruments Incorporated


Part Number bq24765
Description SMBus-Controlled Multi-Chemistry Battery Charger
Maker etcTI
Total Page 30 Pages
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