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LTC1325CSW Datasheet(PDF) 1 Page - Linear Technology |
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LTC1325CSW Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC1325 Microprocessor-Controlled Battery Management System FEATURES DESCRIPTION s Fast Charge Nickel-Cadmium, Nickel-Metal-Hydride, Lithium Ion or Lead-Acid Batteries under µP Control s Flexible Current Regulation: – Programmable 111kHz PWM Current Regulator with Built-In PFET Driver – PFET Current Gating for Use with External Current Regulator or Current Limited Transformer s Discharge Mode s Measures Battery Voltage, Battery Temperature and Ambient Temperature with Internal 10-Bit ADC s Battery Voltage, Temperature and Charge Time Fault Protection s Built-In Voltage Regulator and Programmable Battery Attenuator s Easy-to-Use 3- or 4-Wire Serial µP Interface s Accurate Gas Gauge Function s Wide Supply Range: VDD = 4.5V to 16V s Can Charge Batteries with Voltages Greater Than VDD s Can Charge Batteries from Charging Supplies Greater Than VDD s Digital Input Pins Are High Impedance in Shutdown Mode The LTC ®1325 provides the core of a flexible, cost-effec- tive solution for an integrated battery management sys- tem. The monolithic CMOS chip controls the fast charging of nickel-cadmium, nickel-metal-hydride, lead-acid or lithium batteries under microprocessor control. The de- vice features a programmable 111kHz PWM constant current source controller with built-in FET driver, 10-bit ADC, internal voltage regulator, discharge-before-charge controller, programmable battery voltage attenuator and an easy-to-use serial interface. The chip may operate in one of five modes: power shut- down, idle, discharge, charge or gas gauge. In power shutdown the supply current drops to 30 µA and in the idle mode, an ADC reading may be made without any switching noise affecting the accuracy of the measurement. In the discharge mode, the battery is discharged by an external transistor while the battery is being monitored by the LTC1325 for fault conditions. The charge mode is termi- nated by the µP while monitoring any combination of battery voltage and temperature, ambient temperature and charge time. The LTC1325 also monitors the battery for fault conditions before and during charging. In the gas gauge mode the LTC1325 allows the total charge leaving the battery to be calculated. s System Integrated Battery Charger APPLICATIONS TYPICAL APPLICATION , LTC and LT are registered trademarks of Linear Technology Corporation. Battery Charger for up to 8 NiCd or NiMH Cells 1 2 3 4 5 6 7 8 9 18 17 16 15 14 13 12 11 10 VDD PGATE DIS VBAT TBAT TAMB VIN SENSE FILTER LTC1325 REG DOUT DIN CS CLK LTF MCV HTF GND + R1 CREG 4.7 µF THERM 2 THERM 1 R5 RDIS RTRK RSENSE LTC1325 • TA01 L1 62 µH BAT N1 IRFZ34 VDD 4.5V TO 16V R13 R2 R3 R4 CF 1 µF MPU (e.g. 8051) p1.4 p1.3 p1.2 + C2 10 µF + CREG 22 µF C1 0.1 µF 100 Ω D1 1N6818 P1 IRF9730 |
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