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ISL9217 Datasheet

  • ISL9217

  • 8 to 12 Cell Li-Ion Battery Overcurrent Protection and Analo...

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ISL9216, ISL9217
Data Sheet
November 2, 2007
FN6488.1
8 to 12 Cell Li-Ion Battery Overcurrent
Protection and Analog Front End Chip Set
The ISL9216 and ISL9217 chipset provides overcurrent
protection and voltage monitoring for multi-cell li-ion battery
packs consisting of 8 to 12 cells. When used together, these
devices provide integrated overcurrent protection circuitry,
short circuit protection, an internal voltage regulator, internal
cell balancing switches, cell voltage level shifters, and drive
circuitry for external FET devices that control pack charge
and discharge. Level shifting of the analog output voltage
from the upper cells and communication between the chips
is handled automatically.
Overcurrent and short circuit thresholds reside in internal
RAM registers and are selected independently via software
using an I
2
C serial interface. Detection and time-out delays
can be individually varied using internal registers.
Using an internal analog multiplexer, the device provides
monitoring of cell voltage by a separate microcontroller with
A/D converter. Software on this microcontroller implements
all battery control functionality, except for overcurrent and
short circuit shutdown.
Features
鈥?Software selectable overcurrent protection levels and
variable protect detection/release times
- 4 Discharge overcurrent thresholds
- 4 Short circuit thresholds
- 4 Charge overcurrent thresholds
- 8 Overcurrent delay times (Charge)
- 8 Overcurrent delay times (Discharge)
- 2 Short circuit delay times (Discharge)
鈥?Automatic FET turn-off and cell balance disable on
reaching external (battery) or internal (IC) temperature
limit
鈥?Automatic over-ride of cell balance on reaching internal
(IC) temperature limit
鈥?Fast short circuit pack shutdown
鈥?Can use current sense resistor, FET r
DS(ON)
, or Sense
FET for overcurrent detection
鈥?Four battery backed software controlled flags
鈥?Allows three different FET controls:
- Back-to-back N-Channel FETs for charge and discharge
control
- Single N-Channel FET for discharge control
- N-Channel FET for discharge, with separate, optional
(smaller) back-to-back FET for charge
鈥?Chips cascade for packs of 8 to 12 cells
鈥?Integrated charge/discharge FET drive circuitry with
200碌A(chǔ) (typ) turn on current and 150mA (typ) discharge
FET turn off current
鈥?10% accurate 3.3V voltage regulator (35mA out with
external NPN transistor having current gain of 70)
鈥?Cell voltage monitor accurate to within 25mV
Applications
鈥?Power Tools
鈥?Battery Backup Systems
鈥?E-bikes
鈥?Portable Test Equipment
鈥?Medical Systems
鈥?Hybrid Vehicle
鈥?Military Electronics
Ordering Information
PART NUMBER
(Note)
ISL9216IRZ*
ISL9217IRZ*
PART
MARKING
ISL9216 IRZ
921 7IRZ
PACKAGE
(Pb-Free)
32 Ld 5x5 QFN
24 Ld 4x4 QFN
PKG.
DWG. #
L32.5x5B
L24.4x4D
鈥?Monitored cell voltage output stable in 100碌s
鈥?Internal cell balancing FETs handle up to 200mA of
balancing current for each cell (with the number of cells
being balanced limited by the maximum power dissipation
of 400mW)
鈥?Simple I
2
C host interface
鈥?Sleep operation with programmable negative edge or
positive edge wake-up
鈥?<10碌A(chǔ) sleep mode
鈥?Pb-free (RoHS compliant)
*Add 鈥?T鈥?suffix for tape and reel. 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.
1-888-INTERSIL or 1-888-468-3774
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2007. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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