1
®
FN6775.0
ISL9518, ISL9518A
Narrow VDC Regulator/Charger with
SMBus Interface
The ISL9518, ISL9518A are highly integrated Narrow VDC
system voltage regulators and battery charger controllers.
Operating parameters are programmable over the System
Management Bus (SMBus). The ISL9518, ISL9518A are
designed for applications where the system power source is
either the battery pack or the output of the regulator/charger.
This makes the max voltage to the system equal to the max
battery voltage instead of the max adapter voltage. The
ISL9518, ISL9518A also include a system to control trickle
charging deeply discharged batteries while maintaining
system voltage at a user defined minimum. High efficiency is
achieved with a DC/DC synchronous-rectifier buck converter,
equipped with diode emulation for enhanced light load
efficiency and AC-adapter boosting prevention. The ISL9518,
ISL9518A can charge two to four series connected
Lithium-ion cells, at up to 8A charge current. The ISL9518
has default settings for 2-cell systems and the ISL9518A has
default settings for 3-cell systems. Integrated MOSFET
drivers and bootstrap diode result in fewer components and
smaller implementation area. Low offset current-sense
amplifiers provide high accuracy.
The ISL9518, ISL9518A provide two open drain digital
outputs that indicate the presence of the AC adapter and
trickle charge state. Trickle charge state and AC adapter
present indicators are also available via SMBus. The
ISL9518, ISL9518A also provide two analog outputs that
indicate the adapter current and battery discharge current
with 4% accuracy.
Pinout
ISL9518, ISL9518A
(28 LD TQFN)
TOP VIEW
Features
• ±0.5% System Voltage Accuracy (-10°C to +100°C)
• ±3% Accurate Input Current Limit
• ±3% Accurate Battery Charge Current Limit
• Switching Frequency can be Reduced via SMBus for
Higher Efficiency at Light Load Conditions
• Trickle Charge System for Deeply Discharged Batteries
- Automatic Trickle Charge Current (256mA)
- Holds Minimum Voltage to System
• SMBus 2-Wire Serial Interface
• Battery Short Circuit Protection
• Fast System-Load Transient Response
• Monitor Outputs
- Adapter Current (2.5% Accuracy)
- Trickle Charge Mode Indicator
- AC-Adapter Present Indicator
• 11-Bit Max System Voltage Setting
• 7-Bit Min System Voltage Setting
• 6-Bit Charge Current Setting
• 6-Bit Adapter Current Setting
• Over 8A Battery Charger Current
• Over 8A Maximum Adapter Current
• +8V to +22V Adapter Voltage Range
• Pb-Free (RoHS Compliant)
Applications
• Notebook Computers
• Tablet PCs
• Portable Equipment with Rechargeable Batteries
CSIP
CSIN
AGND
BOOT
UGATE
PHASE
PGND
VFB
ACMON
SDA
SCL
VSMB
TRKLN
ADPR
SGATE
DCIN
ADET
VREF
ICOMP
AGND
VCOMP
LGATE
VDDP
VDD
CSOP
CSON
BGATE
AGND
1
2
3
4
5
6
7
21
20
19
18
17
16
15
28 27 26 25 24 23 22
8 9 10 11 12 13 14
Data Sheet December 8, 2008
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
| Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2008. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
