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ISL88731A Datasheet, PDF (1/23 Pages) Intersil Corporation – SMBus Level 2 Battery Charger
®
Data Sheet
January 7, 2009
ISL88731A
FN6738.1
SMBus Level 2 Battery Charger
The ISL88731A is a highly integrated Lithium-ion battery
charger controller, programmable over the SMBus system
management bus (SMBus). The ISL88731A is intended to be
used in a smart battery charger (SBC) within a smart battery
system (SBS) that throttles the charge power such that the
current from the AC-adapter is automatically limited. High
efficiency is achieved with a DC/DC synchronous-rectifier
buck converter, equipped with diode emulation for enhanced
light load efficiency and system bus boosting prevention. The
ISL88731A charges one to four Lithium-ion series cells, and
delivers up to 8A charge current. Integrated MOSFET
drivers and bootstrap diode result in fewer components and
smaller implementation area. Low offset current-sense
amplifiers provide high accuracy with 10mΩ sense resistors.
The ISL88731A provides 0.5% end-of-charge battery
voltage accuracy.
The ISL88731A provides a digital output that indicates the
presence of the AC-adapter as well as an analog output
which indicates the adapter current within 4% accuracy.
The ISL88731A is available in a small 5mmx5mm 28 Ld thin
(0.8mm) QFN package. An evaluation kit is available to
reduce design time. The ISL88731A is available in Pb-Free
packages.
Pinout
ISL88731A
(28 LD TQFN)
TOP VIEW
28 27 26 25 24 23 22
NC 1
21 VDDP
ACIN 2
20 LGATE
VREF 3
19 PGND
ICOMP 4
NC 5
18 CSOP
17 CSON
VCOMP 6
NC 7
16 NC
15 VFB
8 9 10 11 12 13 14
Features
• 0.5% Battery Voltage Accuracy
• 3% Adapter Current Limit Accuracy
• 3% Charge Current Accuracy
• SMBus 2 Wire Serial Interface
• Battery Short Circuit Protection
• Fast Response for Pulse-Charging
• Fast System-Load Transient Response
• Monitor Outputs
- Adapter Current (3% Accuracy)
- AC-Adapter Detection
• 11-Bit Battery Voltage Setting
• 6 Bit Charge Current/Adapter Current Setting
• 8A Maximum Battery Charger Current
• 11A Maximum Adapter Current
• +8V to +28V Adapter Voltage Range
• Pb-Free (RoHS compliant)
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP
RANGE
(°C)
PACKAGE PKG.
(Pb-Free) DWG. #
ISL88731AHRZ ISL887 -10 to +100 28 Ld 5x5
31AHRZ
TQFN
L28.5x5B
ISL88731AHRZ-T* ISL887
31AHRZ
-10 to +100 28 Ld 5x5
TQFN (Tape
and Reel)
L28.5x5B
*Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special
Pb-free material sets, molding compounds/die attach materials, and
100% matte tin plate plus anneal (e3 termination finish, which is RoHS
compliant and compatible with both SnPb and Pb-free soldering
operations). Intersil Pb-free products are MSL classified at Pb-free peak
reflow temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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