bq24707A Controller Datasheet

bq24707A Datasheet, PDF, Equivalent


Part Number

bq24707A

Description

1-4 Cell Li+ Battery SMBus Charge Controller

Manufacture

etcTI

Total Page 30 Pages
Datasheet
Download bq24707A Datasheet


bq24707A
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bq24707, bq24707A
SLUSA78C – JULY 2010 – REVISED JULY 2015
bq24707x 1-4 Cell Li+ Battery SMBus Charge Controller With Independent Comparator
and Advanced Circuit Protection
1 Features
1 SMBus Host-Controlled NMOS-NMOS
Synchronous Buck Converter With Programmable
615 kHz, 750 kHz, and 885 kHz Switching
Frequency
• Real-Time System Control on ILIM Pin to Limit
Charge Current
• Enhanced Safety Features for Overvoltage
Protection, Overcurrent Protection, Battery,
Inductor, and MOSFET Short-Circuit Protection
• Programmable Input Current, Charge Voltage,
Charge Current Limits
– ±0.5% Charge Voltage Accuracy up to 19.2 V
– ±3% Charge Current Accuracy up to 8.128 A
– ±3% Input Current Accuracy up to 8.064 A
– ±2% 20× Adapter Current or Charge Current
Output Accuracy
• Programmable Adapter Detection and Indicator
• Independent Comparator With Internal Reference
• Integrated Soft-Start
• Integrated Loop Compensation
• AC Adapter Operating Range 5 V to 24 V
• 15-µA Off-State Battery Discharge Current
• 20-pin 3.5 mm × 3.5 mm QFN Package
• bq24707: ACOK Delay Default 1.3 s
• bq24707A: ACOK Delay Default 1.2 ms
3 Description
The bq24707 and bq24707A devices are high-
efficiency, synchronous battery chargers, offering low
component count for space-constrained, multi-
chemistry battery charging applications.
SMBus controlled 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.
The IC uses the internal input current register or
external ILIM pin to throttle down PWM modulation to
reduce the charge current.
The IC provides an IFAULT output to alarm if any
MOSFET fault or input over current occurs. This
alarm output allows users to turn off input power
selectors when the fault occurs. Meanwhile, an
independent comparator with internal reference is
available to monitor input current, output current, or
output voltage.
The IC charges one-, two-, three-, or four-series Li+
cells, and is available in a 20-pin, 3.5 × 3.5 mm QFN
package.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
bq24707
bq24707A
VQFN (20)
3.50 mm × 3.50 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2 Applications
• Portable Notebook Computers, UMPCs, Ultra-Thin
Notebooks, and Netbooks
• Personal Digital Assistants
• Handheld Terminals
• Industrial and Medical Equipment
• Portable Equipment
Adapter P
4.5-24 V Q1
Simplified Schematic
Enhanced Safety:
OCP, OVP,FET Short
P RAC
Q2
SYS
Adapter Detection
bq2707x
SMBus Controls V & I
with high accuracy
SMBus
HOST
Charge
Controller
Battery
Pack
RSR 1S-4S
Integration:
Loop Compensation; Soft-Start
Comparator
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.

bq24707A
bq24707, bq24707A
SLUSA78C – JULY 2010 – REVISED JULY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 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....................... 5
7.4 Thermal Information .................................................. 5
7.5 Electrical Characteristics........................................... 6
7.6 Timing Requirements .............................................. 10
7.7 Typical Characteristics ............................................ 11
8 Detailed Description ............................................ 14
8.1 Overview ................................................................. 14
8.2 Functional Block Diagram ....................................... 15
8.3 Feature Description................................................. 16
8.4 Device Functional Modes........................................ 17
8.5 Programming........................................................... 18
9 Application and Implementation ........................ 26
9.1 Application Information............................................ 26
9.2 Typical Application ................................................. 26
10 Power Supply Recommendations ..................... 31
11 Layout................................................................... 31
11.1 Layout Guidelines ................................................. 31
11.2 Layout Example .................................................... 33
12 Device and Documentation Support ................. 35
12.1 Device Support...................................................... 35
12.2 Documentation Support ........................................ 35
12.3 Related Links ........................................................ 35
12.4 Community Resources.......................................... 35
12.5 Trademarks ........................................................... 35
12.6 Electrostatic Discharge Caution ............................ 35
12.7 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 Revision B (March 2011) to Revision C
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
Changes from Revision A (November 2010) to Revision B
Page
• Added Features for the bq24707 and bq24707A .................................................................................................................. 1
• Added device bq24707A to this data sheet............................................................................................................................ 1
• Added bq24707A to the ORDERING INFORMATION table .................................................................................................. 3
• Added the COMPARISON TABLE ......................................................................................................................................... 3
• Added bq24707 only to the test condition of tACOK_FALL_DEG first row .................................................................................... 10
• Added bq24707A only to the test condition of tACOK_FALL_DEG second row............................................................................ 10
• Added (bq24707) to the title of Figure 2............................................................................................................................... 11
• Added a new paragraph in the Battery Over Voltage Protection (BATOVP) section........................................................... 17
• Changed the Description of the ACOK Deglitch Time Adjust bit in Table 3......................................................................... 20
• Changed the Adapter Detect and ACOK Output section. included 1.3s for bq24707 and 1.2ms for bq24707A................. 24
• Changed the Description of item U1 in Table 9 ................................................................................................................... 30
Changes from Original (July 2010) to Revision A
Page
• Updated the description for the SRN and SRP pins .............................................................................................................. 4
• Changed the Functional Block Diagram, Figure 16.............................................................................................................. 26
• Added Added section: Negative Output Voltage Protection................................................................................................. 27
• Deleted C12, added R14 and R15 in Table 9 ...................................................................................................................... 30
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Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links: bq24707 bq24707A


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community Reference Design bq24707, b q24707A SLUSA78C – JULY 2010 – REVI SED JULY 2015 bq24707x 1-4 Cell Li+ Bat tery SMBus Charge Controller With Indep endent Comparator and Advanced Circuit Protection 1 Features •1 SMBus Host- Controlled NMOS-NMOS Synchronous Buck C onverter With Programmable 615 kHz, 750 kHz, and 885 kHz Switching Frequency Real-Time System Control on ILIM Pin to Limit Charge Current • Enhanced S afety Features for Overvoltage Protecti on, Overcurrent Protection, Battery, In ductor, and MOSFET Short-Circuit Protec tion • Programmable Input Current, Ch arge Voltage, Charge Current Limits – ±0.5% Charge Voltage Accuracy up to 1 9.2 V – ±3% Charge Current Accuracy up to 8.128 A – ±3% Input Current Ac curacy up to 8.064 A – ±2% 20× Adap ter Current or Charge Current Output Ac curacy • Programmable Adapter Detecti on and Indicator • Independent Comparator With Internal Reference • Integrated Soft-Start .
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