ISL9208| Datasheet

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ISL9208
Data Sheet November 2, 2007 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.

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 rDS(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 200uA (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 100us. 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).

Applications
Power Tools Battery Backup Systems E-Bikes Portable Test Equipment Medical Systems Hybrid Vehicle Military Electronics

Ordering Information
PART NUMBER (Note) ISL9208IRZ* PART MARKING ISL9208 IRZ PACKAGE (Pb-free) 32 Ld 5x5 QFN PKG. DWG. # L32.5x5B

Simple I2C host interface Sleep operation with programmable negative edge or positive edge wake-up. <10uA Sleep Mode Pb-free (RoHS compliant)

*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.

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.