ISL9208_0711 Datasheet, PDF (1/28 Pages) Intersil Corporation – Multi-Cell Li-ion Battery Pack OCP/Analog Front End

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Data Sheet
November 2, 2007
ISL9208
FN6446.1
Multi-Cell Li-ion Battery Pack OCP/Analog
Front End
The ISL9208 is an overcurrent protection device and analog
front end for a microcontroller in a multi-cell Li-ion battery
pack. The ISL9208 supports battery pack configurations
consisting of 5-cells to 7-cells in series and 1 or more cells in
parallel. The ISL9208 provides integral overcurrent
protection circuitry, short circuit protection, an internal 3.3V
voltage regulator, internal cell balancing switches, cell
voltage monitor level shifters, and drive circuitry for external
FET devices for control of pack charge and discharge.
Selectable overcurrent and short circuit thresholds reside in
internal RAM registers. An external microcontroller sets the
thresholds by setting register values through an I²C serial
interface. Internal registers also contain the detection delays
for overcurrent and short circuit conditions.
Using an internal analog multiplexer the ISL9208 provides
monitoring of each cell voltage plus internal and external
temperature by a separate microcontroller with an A/D
converter. Software on this microcontroller implements all
battery pack control functionality, except for overcurrent and
short circuit shutdown.
Applications
• Power Tools
• Battery Backup Systems
• E-Bikes
• Portable Test Equipment
• Medical Systems
• Hybrid Vehicle
• Military Electronics
Ordering Information
PART NUMBER
PART
(Note)
MARKING
PACKAGE
(Pb-free)
PKG.
DWG. #
ISL9208IRZ* ISL9208 IRZ 32 Ld 5x5 QFN L32.5x5B
*Add “-T” 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.
Features
• Software selectable overcurrent protection levels and
variable protect detection 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)
• Automatic FET turn-off and cell balance disable on reaching
external (battery) or internal (IC) temperature limit.
• Automatic override of cell balance on reaching internal
(IC) temperature limit.
• Fast short circuit pack shutdown
• Can use current sense resistor, FET r_DS(ON), or Sense
FET for overcurrent detection.
• Four battery backed software controlled flags.
• Allows three different FET controls:
- Back-to-back N-Channel FETs for charge and discharge
control
- Single N-Channel discharge FET.
- Single N-Channel FET for discharge, with separate,
optional (smaller) back-to-back N-channel FETs for
charge.
• Integrated Charge/Discharge FET Drive Circuitry with
200µA (typ) turn-on current and 150mA (typ) Discharge
FET turn-off current.
• 10% Accurate 3.3V voltage regulator (minimum 25mA out
with external NPN transistor having current gain of 70).
• Monitored cell voltage output stable in 100µs.
• 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 package power
dissipation of 400mW).
• Simple I²C host interface
• Sleep operation with programmable negative edge or
positive edge wake-up.
• <10µA Sleep Mode
• Pb-free (RoHS compliant)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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