ISL94200IRZ

ISL94200 ® Data Sheet July 3, 2008 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 • Battery Backup Systems • 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 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 • 10% Accurate 3.3V Voltage Regulator (Minimum 25mA Out With External NPN Transistor Having Current Gain Of 70) • E-Bikes • Portable Test Equipment • Medical Systems • Monitored Cell Voltage Output Stable in 100µs • Hybrid Vehicle • Simple I2C Host Interface • Military Electronics • Sleep Operation With Programmable Negative Edge or Positive Edge Wake-Up Ordering Information ISL94200IRZ Features • Integrated Charge/Discharge FET Drive Circuitry With 130µA (Typ) Turn-On Current and 180mA (Typ) Discharge FET Turn-Off Current • Power Tools PART NUMBER (Note) FN6718.0 PART MARKING PACKAGE (Pb-free) 942 00IRTZ 24 Ld 4x4 QFN PKG. DWG. # L24.4x4D • threshold. WKPOL bit = ”0”, the device wakes up on the falling edge of the WKUP pin. Also, the WKUP bit is HIGH only when the WKUP pin voltage < threshold. SDA Serial Data. This is the bidirectional data line for an I2C interface. SCL Serial Clock. This is the clock input for an I2C communication link. 3 FN6718.0 July 3, 2008 ISL94200 Absolute Maximum Ratings Thermal Information Power Supply Voltage, VCC . . . . . . . . . .VSS - 0.5V to VSS + 36.0V Cell Voltage, VCELL VCELLN - (VCELLN - 1), VCELL1 - VSS. . . . . . . . . . . -0.5V to 5V Terminal Voltage, VTERM1 (SCL, SDA, CSENSE, DSENSE, TEMPI, RGO, AO, TEMP3V) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS - 0.5 to VRGO + 0.5V Terminal Voltage, VTERM2 (CFET, VMON) . . . . VSS - 22.0V to VCC Terminal Voltage, VTERM3 (WKUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . VSS - 0.5V to VCC (VCC