bq2158 Features Three or Four Series Cell Li-Ion Pack Supervisor Module ä Complete and compact lithium-ion pack supervisor ä Provides overvoltage, undervoltage, and overcurrent protection for three or four series Li-Ion cells ä Combines bq2058 with charge/discharge control FETs ä High side low on-resistance FETs ä Designed for battery pack integration ä – Direct connection for series battery terminals – Measures 2.10 X 0.70 inches Low standby and operating currents General Description The bq2158 provides a complete solution for the supervision of three or four series Li-Ion cells. Designed for battery pack integration, the bq2158 incorporates a bq2058 Pack Supervisor, two FETs, and all other components required to monitor overvoltage, undervoltage, and overcu rre n t c o nd i ti o ns. T he bo a r d p r o v id es d ir ec t connections for the negative and positive terminals of each cell. See Figure 1. Please refer to the bq2058 data sheet for specific information on the operation of the bq2058. Pin Descriptions Unitrode configures the bq2158 based on the information in Table 1. 5/99 B 1 B1P Battery 1 positive input/pack positive B1N Battery 1 negative input B2N Battery 2 negative input B3N Battery 3 negative input B4N Battery 4 negative input POS Pack positive NEG Pack negative bq2158 Table 1. bq2158 Module Configuration Customer Name: ___________________________________________________________________________ Contact: _________________________________________ Phone: ______________________________ Address: _________________________________________________________________________________ _________________________________________________________________________________ Sales Contact: ____________________________________ Phone: ______________________________ Number of series cells (3 or 4) ________________________________________ Overvoltage threshold (4.25, 4.30 or 4.35V) ________________________________________ Charge current (3.9A max.) ________________________________________ Discharge current (3.9A max.) ________________________________________ FAE approval: _____________________________________ 2 Date: _______________________________ bq2158 Table 2. Pin Connections Number of Cells On-board bq2058 Configuration 3 cells BAT1N tied to BAT1P NSEL = VSS 4 cells NSEL = VCC Operation The bq2158 monitors each series element for undervoltage, over-voltage, and over-current conditions. If a cell falls below VUV for tUVD, the bq2158 enters into sleep mode. The bq2158 wakes up and enables discharge if a voltage, VCD higher than the battery voltage, is applied across POS and NEG. Charging is disabled if a cell exceeds VOV for tOVD, and can resume when the cell falls below the VCE threshold. The bq2158 turns the discharge FET off if the steady state load current exceeds IOC for tOCD and turns it back on if the load is removed. B1P NC B1P POS B1N B1N Load or Charger B2N Load or Charger B2N B3N B3N B4N POS B4N NEG NEG Four-Cell Configuration Three-Cell Configuration Note: B1P, B4N, POS, and NEG accomodate a #20 AWG stranded wire. B1N, B2N, and B3N accomodate a #24 AWG stranded wire. FG2158cc.eps Figure 1. Module Connection Diagram 3 bq2158 bq2158 Schematic 4 6X .055 .031 LAYER 1 LAYER 2 5 B3N B2N B1N B1P 1.640 1.845 2.045 U1 R5 C1 R3 R4 C2 C4 R7 C3 R2 R6 C9 D2 R1 R11 R10 C5 C10 C7 Q4 1.440 Q2 B4N Q1 D1 .700 1.065 R9 C6 TP1O NEG POS Q3 .915 0 .055 bq2158 bq2158 Board 2.100 C8 R8 .065 .068 bq2158 Absolute Maximum Ratings Symbol Parameter Value Unit Conditions VOP Supply voltage (B1P to B4N) 18 V DC VTR Maximum transient voltage (B1P to B4N) 32 V Maximum duration = 1.5µs VCHG Charging voltage (POS to NEG) 18 V ICHG Continuous charge/discharge current 3.9 A TOPR Operating temperature -30 to +70 °C TSTG Storage temperature -55 to +125 °C Note: VOP > 6V TA = 25°C Permanent device damage may occur if Absolute Maximum Ratings are exceeded. Functional operation should be limited to the Recommended DC Operating Conditions detailed in this data sheet. Exposure to conditions beyond the operational limits for extended periods of time may affect device reliability. DC Electrical Characteristics (TA = TOPR) Symbol Parameter Minimum Typical Maximum Unit 4.0 - 18 V Conditions/Notes VOP Operating voltage, B1P to B4N ICCA Operating current - 39 57 µA ICCS Sleep current - 0.7 1.5 µA No load across POS and NEG RON On resistance, B1P to POS - - 50 mΩ TA = 25°C VOP = 10V 6 bq2158 DC Thresholds (TA = TOPR) Symbol Parameter Value Tolerance Unit VOV Overvoltage threshold 4.25 ± 50mV V VCE Charge enable voltage VOV - 100mV ± 50mV V VUV Undervoltage limit 2.25 ± 100mV V IOC Overcurrent limit Notes 3.4 A TA = 25°C 3.8 A TA = 60°C TA = 30°C tUVD Undervoltage delay 950 ±50% ms VCD Charge detect threshold 70 -60, +80 mV tOVD Overvoltage delay 950 ±50% ms TA = 30°C tOCD Overcurrent delay 12 ±60% ms TA = 30°C Note: The thresholds above reflect the operation of a bq2158 using the standard bq2058 IC (VOV = 4.25V). Specify other versions of the bq2058 by indicating the appropriate VOV threshold in Table 1. Data Sheet Revision History Change No. Page No. 1 3 Note: Description Nature of Change Table 2 pin connections Clarified onboard bq2058 connection. Change 1 = May 1999 B changes from July 1996. Ordering Information bq2158 B — Customer Code: Blank = Sample or Pre-production1 XXX = Customer-specific; assigned by Unitrode2 Package Option: B = Board-level product Device: Three- or Four-Series Cell Li-Ion Supervisor Module Notes: 1. Requires configuration sheet (Table 1) 2. Example production part number: bq2158B-001 7 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. 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