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bq29440 Dataheets PDF



Part Number bq29440
Manufacturers Texas Instruments
Logo Texas Instruments
Description VOLTAGE PROTECTION
Datasheet bq29440 Datasheetbq29440 Datasheet (PDF)

bq29440, bq2944L0 bq29441, bq29442, bq29443, bq29449, bq2944L9 www.ti.com SLUSA15C – JUNE 2010 – REVISED NOVEMBER 2010 Voltage Protection for 2-Series, 3-Series, or 4-Series Cell Li-Ion Batteries (Second-Level Protection) Check for Samples: bq29440, bq2944L0, bq29441, bq29442, bq29443, bq29449, bq2944L9 FEATURES 1 • 2-Series, 3-Series, or 4-Series Cell Secondary Protection • External Capacitor-Controlled Delay Timer • Low Power Consumption ICC < 2 µA Typical [VCELL(ALL) < VPROTECT] • High-.

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bq29440, bq2944L0 bq29441, bq29442, bq29443, bq29449, bq2944L9 www.ti.com SLUSA15C – JUNE 2010 – REVISED NOVEMBER 2010 Voltage Protection for 2-Series, 3-Series, or 4-Series Cell Li-Ion Batteries (Second-Level Protection) Check for Samples: bq29440, bq2944L0, bq29441, bq29442, bq29443, bq29449, bq2944L9 FEATURES 1 • 2-Series, 3-Series, or 4-Series Cell Secondary Protection • External Capacitor-Controlled Delay Timer • Low Power Consumption ICC < 2 µA Typical [VCELL(ALL) < VPROTECT] • High-Accuracy Overvoltage Protection: ±25 mV with TA = 0°C to 60°C • Fixed Overvoltage Protection Thresholds: 4.30 V, 4.35 V, 4.40 V, 4.45 V, 4.50 V • Small 8L QFN Package APPLICATIONS • Second-Level Protection in Li-Ion Battery Packs – Notebook Computers – Power Tools – Portable Equipment and Instrumentation DESCRIPTION The bq2944x is a secondary overvoltage protection IC for 2-series, 3-series, or 4-series cell Li-Ion battery packs that incorporates a high-accuracy precision overvoltage detection circuit. FUNCTION The voltage of each cell in a battery pack is compared to an internal reference voltage. If any cells reach an overvoltage condition, the bq2944x device starts a timer that provides a delay proportional to the capacitance on the CD pin. Upon expiration of the internal timer, the OUT pin changes from a low state to a high state. An optional latch configuration is available that holds the OUT pin in a high state indefinitely after an overvoltage condition has satisfied the specified delay timer period. The latch is released when the CD pin is shorted to GND. T T DRB Package (Top View) VC1 1 VC2 2 VC3 3 GND 4 8 OUT 7 VDD 6 CD 5 VC4 P0012-02 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Copyright © 2010, Texas Instruments Incorporated bq29440, bq2944L0 bq29441, bq29442, bq29443, bq29449, bq2944L9 SLUSA15C – JUNE 2010 – REVISED NOVEMBER 2010 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. TA –40°C to +110°C PART NUMBER BQ29440 BQ2944L0 BQ29441 BQ29442 BQ29443 BQ29449 BQ2944L9 OUT PIN LATCH OPTION No Yes No No No No Yes Table 1. ORDERING INFORMATION(1) PACKAGE PACKAGE DESIGNATOR PACKAGE MARKING OVP QFN-8 DRB 440 44L0 441 442 443 449 44L9 4.35 V 4.35 V 4.40 V 4.45 V 4.50 V 4.30 V 4.30 V ORDERING INFORMATION(2) TAPE AND REEL TAPE AND REEL (LARGE) (3) (SMALL) (4) BQ29440DRBR BQ29440DRBT BQ2944L0DRBR BQ2944L0DRBT BQ29441DRBR BQ29441DRBT BQ29442DRBR BQ29442DRBT BQ29443DRBR BQ29443DRBT BQ29449DRBR BQ29449DRBT BQ2944L9DRBR BQ2944L9DRBT (1) Example: bq2944L0DRBR is a device with the OUT latch option with a VOV threshold of 4.35 V. Contact Texas Instruments for other VOV threshold options. (2) For the most current package and ordering information, see the Package Addendum at the end of this document, or the TI website at www.ti.com. (3) Large tape and reel quantity is 3,000 units. (4) Small tape and reel quantity is 250 units. THERMAL INFORMATION THERMAL METRIC(1) qJA qJC(top) qJB yJT yJB qJC(bottom) Junction-to-ambient thermal resistance(2) Junction-to-case(top) thermal resistance(3) Junction-to-board thermal resistance(4) Junction-to-top characterization parameter(5) Junction-to-board characterization parameter(6) Junction-to-case(bottom) thermal resistance(7) bq2944x DRB 8 PINS 50.5 25.1 19.3 0.7 18.9 5.2 UNITS °C/W (1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953. (2) The junction-to-ambient thermal resistance under natural convection is obtained in a simulation on a JEDEC-standard, high-K board, as specified in JESD51-7, in an environment described in JESD51-2a. (3) The junction-to-case (top) thermal resistance is obtained by simulating a cold plate test on the package top. No specific JEDEC- standard test exists, but a close description can be found in the ANSI SEMI standard G30-88. (4) The junction-to-board thermal resistance is obtained by simulating in an environment with a ring cold plate fixture to control the PCB temperature, as described in JESD51-8. (5) The junction-to-top characterization parameter, yJT, estimates the junction temperature of a device in a real system and is extracted from the simulation data for obtaining qJA, using a procedure described in JESD51-2a (sections 6 and 7). (6) The junction-to-board characterization parameter, yJB, estimates the junction tempera.


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