Enhanced Single Cell Lithium-Ion Battery Protection Protects sens

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Enhanced Single Cell Lithium-Ion Battery Protection Protects sens

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UCC3952-1/-2/-3/-4
Enhanced Single Cell Lithium-Ion Battery Protection
Protects sensitive Lithium cells from over-charging over-discharging Dedicated cell applications Integrated impedance MOSFET switch sense resistor Precision trimmed overcharge overdischarge voltage limits Extremely power drain current capacity Overcurrent Short Circuit Protection Reverse Charger Protection Thermal Protection
DESCRIPTION
UCC3952 monolithic BiCMOS lithium-ion battery protection circuit that designed enhance useful operating life cell rechargeable battery pack. Cell protection features consist internally trimmed charge discharge voltage limits, discharge current limit with delayed shutdown ultra current sleep mode state when cell discharged. Additional features include chip MOSFET reduced external component count charge pump reduced power losses while charging discharging cell voltage battery pack. This protection circuit requires external capacitor able operate safely shutdown presence short circuit condition.
APPLICATION DIAGRAM
TCLK
PACK+
CBPS
BNEG
0.1µF
BNEG
PACK-
CHARGER
BNEG
PACK-
LOAD
BNEG
PACK-
BNEG
PACK-
BNEG PACK-
UDG-98205
SLUS400 AUGUST 1999
UCC3952-1/-2/-3/-4
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (PACK+ BNEG) Maximum Forward Voltage (PACK+ PACK-) Maximum Reverse Voltage (where PACK+ BNEG 5V). Maximum Cell Continuous Charge Current Junction Temperature -55°C 150°C Storage Temperature Range -40°C 125°C
CONNECTION DIAGRAMS
SOIC-16 (TOP VIEW) Package
TCLK PACK+ CBPS PACK- PACK- PACK-
Currents positive into, negative specified terminal. Consult Packaging Section Databook thermal limitations considerations packages. voltages referenced GND.
TSSOP-16 (TOP VIEW) Package
TCLK BNEG BNEG BNEG BNEG BNEG BNEG PACK+ CBPS PACK- PACK- PACK- PACK- PACK-
BNEG BNEG BNEG
BCC-18 (TOP VIEW) Package
TCLK PACK+
BNEG BNEG BNEG BNEG
CBPS PACK- PACK- PACK-
BNEG BNEG
PACK- PACK-
Consult factory package availability.
ELECTRICAL CHARACTERISTICS: Temperature Range: -20°C 70°C, Unless otherwise stated. voltages
with respect BNEG. PARAMETER State Transition Threshold Section NORM (VOV) NORM (VOVR) NORM (VOV) NORM (VOVR) NORM (VOV) NORM (VOVR) NORM (VOV) NORM (VOVR) UCC3952-1 UCC3952-1 UCC3952-2 UCC3952-2 UCC3952-3 UCC3952-3 UCC3952-4 UCC3952-4 4.15 3.85 4.20 3.90 4.25 3.95 4.30 4.00 4.20 3.90 4.25 3.95 4.30 4.00 4.35 4.05 4.25 3.95 4.30 4.00 4.35 4.05 4.40 4.10 TEST CONDITIONS UNITS
UCC3952-1/-2/-3/-4
ELECTRICAL CHARACTERISTICS: Temperature Range: -20°C 70°C, Unless otherwise stated. voltages
with respect BNEG. PARAMETER State Transition Threshold Section (cont.) Delay Time (TOV) NORM (VUV) NORM (VUVR) Overdischarge Delay Time (TOD) Short Circuit Protection Section ITHLD TDLY RRESET Bias Section Normal operating current. VPACK Operating current overvoltage VPACK Shutdown operating current VPACK VMIN Switch Section VPACK- PACK+ VOV, I(SWITCH) Battery overcharged state switch permits discharge current only. PACK+ 2.5V, I(SWITCH) -1mA Battery overdischarged state switch permits charge current only. Normal Mode (when UV). This value includes package bondwire resistance. PACK+ 2.5V Thermal shutdown temperature. (Note -600 Minimum cell voltage when circuits guaranteed fully functional Discharge current limit, PACK+ 3.7V Discharge current delay, PACK+ 3.7V, Discharge current reset resistance, PACK+ UCC3952-1, UCC3952-2, UCC3952-3, UCC3952-4 UCC3952-1, UCC3952-2, UCC3952-3, UCC3952-4 2.25 2.55 2.35 2.65 2.45 2.75 TEST CONDITIONS UNITS
VPACK-
-100
Thermal Shutdown Section
Note This parameter guaranteed design. 100% tested production.
DESCRIPTIONS
BNEG: Connect negative terminal battery this pin. PACK+: Connect positive terminal battery. This available user. CBPS: This power supply bypass connected PACK+ through internal resistor. external capacitor must connected between this BNEG. PACK-: negative terminal battery pack (negative terminal available user). internal switch connects this terminal BNEG terminal give battery pack user appropriate access battery. over-charged state, only discharge current permitted. over-discharged state, only charge current permitted. SUB: Package Only) connect. These pins must electrically isolated from other pins. These pins soldered isolated coppper pads heatsinking. However, most applications require heatsinking. TCLK: Production Test Mode pin. This used provide high frequency clock during production testing. application this left unconnected, tied BNEG.
UCC3952-1/-2/-3/-4
APPLICATION INFORMATION
PACK+ CBPS
VUVR VOVR TCLK BNEG BNEG BNEG BNEG BNEG BNEG PACK- VPUMP THERMAL SHUTDOWN 50mV 50mV SYSTEM CLOCK GENERATOR TDLS SETD THRESHOLD COMPARATOR 1.5V STATE MACHINE LOGIC TDEL 10mS TDEL 1SEC
PACK- PACK- PACK- PACK- PACK-
package shown
UDG-98209
Figure Detailed block diagram.
APPLICATION INFORMATION
Fig. shows detailed block diagram UCC3952. Battery Voltage Monitoring battery cell voltage sampled every connecting resistor divider across comparing resulting voltage precision internal reference voltage. Under normal conditions (cell voltage below Over Voltage threshold above Under Voltage threshold), UCC3952 consumes less than 10µA current internal MOSFET fully turned with charge pump. When cell voltage falls below Under Voltage threshold consecutive samples, discon4 nects load from battery pack enters super power mode. pack will remain this state until detects application charger, which point charging enabled. requirement consecutive readings below threshold filters momentary drops cell voltage load transients, preventing nuisance trips. cell voltage exceeds Over Voltage threshold 1sec, charging disabled, however discharge current still allowed. This feature explained further section Controlled Charge/Discharge Mode.
UCC3952-1/-2/-3/-4
APPLICATION INFORMATION (cont.)
Over Current Monitoring Protection Discharge current continuously monitored internal sense resistor. event excessive current, Over Current condition declared high current (over persists over 1ms. This delay allows charging system bypass capacitors without tripping overcurrent. 0.1µF capacitor CBPS provides momentary holdup assure proper operation event that hard short suddenly pulls cell voltage below minimum operating voltage. Once Over Current condition been declared, internal MOSFET turns off. only return pack normal operation remove load unplugging pack from system. overcurrent reset when internal pull down brings PACK(-) within 50mV BNEG. this point, pack returns normal state operation. Controlled Charge/Discharge Mode When chip senses over-voltage condition, prevents additional charging, allows discharge. This accomplished activating linear control loop which controls gate MOSFET based differential voltage across drain source terminals. linear loop attempts regulate differential voltage across MOSFET 100mV. When light load applied part, loop adjusts impedance MOSFET maintain 100mV across load increases, impedance MOSFET decreased maintain 100mV control. heavy loads (still below "over-current" limit level), loop will maintain regulation will drive gate MOSFET battery voltage (not charge-pump output voltage). MOSFET RDS(on) over-voltage state will higher than RDS(on) during normal operation. voltage drop (and associated power loss) across internal MOSFET this mode operation still significantly lower than typical solution external back-to-back MOSFETs, where body diode conducting. When chip senses under-voltage condition, disconnects load from battery pack shuts itself down minimize current drain from battery. Several circuits remain powered will detect placement battery pack into charger. Once charger presence detected, linear loop activated chip allows charging current into battery. This linear control mode operation effect until battery voltage reaches level VUVR, which time normal operation resumed.
UNITRODE CORPORATION CONTINENTAL BLVD. MERRIMACK, 03054 TEL. (603) 424-2410 (603) 424-3460
IMPORTANT NOTICE Texas Instruments subsidiaries (TI) reserve right make changes their products discontinue product service without notice, advise customers obtain latest version relevant information verify, before placing orders, that information being relied current complete. products sold subject terms conditions sale supplied time order acknowledgement, including those pertaining warranty, patent infringement, limitation liability. warrants performance semiconductor products specifications applicable time sale accordance with TI's standard warranty. Testing other quality control techniques utilized extent deems necessary support this warranty. Specific testing parameters each device necessarily performed, except those mandated government requirements. CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS INVOLVE POTENTIAL RISKS DEATH, PERSONAL INJURY, SEVERE PROPERTY ENVIRONMENTAL DAMAGE ("CRITICAL APPLICATIONS"). SEMICONDUCTOR PRODUCTS DESIGNED, AUTHORIZED, WARRANTED SUITABLE LIFE-SUPPORT DEVICES SYSTEMS OTHER CRITICAL APPLICATIONS. INCLUSION PRODUCTS SUCH APPLICATIONS UNDERSTOOD FULLY CUSTOMER'S RISK. order minimize risks associated with customer's applications, adequate design operating safeguards must provided customer minimize inherent procedural hazards. assumes liability applications assistance customer product design. does warrant represent that license, either express implied, granted under patent right, copyright, mask work right, other intellectual property right covering relating combination, machine, process which such semiconductor products services might used. TI's publication information regarding third party's products services does constitute TI's approval, warranty endorsement thereof.
Copyright 1999, Texas Instruments Incorporated

Enhanced Single Cell Lithium-Ion Battery Protection Protects sens

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