ISL94200 Datasheet, PDF (1/28 Pages) Intersil Corporation – Multi-Cell Li-ion Battery Pack OCP/Analog Front-End

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Data Sheet
July 3, 2008
ISL94200
FN6718.0
Multi-Cell Li-ion Battery Pack OCP/Analog
Front-End
The ISL94200 is an overcurrent protection device and
analog front end for a microcontroller in a multi-cell Li-ion
battery pack. The ISL94200 supports battery pack
configurations consisting of 4-cells to 7-cells in series and
1 or more cells in parallel. The ISL94200 provides integral
overcurrent protection circuitry, short circuit protection, an
internal 3.3V voltage regulator, 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 ISL94200 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. #
ISL94200IRZ 942 00IRTZ 24 Ld 4x4 QFN L24.4x4D
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 Crcuit 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 On Reaching External (Battery) or
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
130µA (Typ) Turn-On Current and 180mA (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
• 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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