LTC1325CSW
发布时间：2018/5/15
概述
The LTC1325CSW provides the core of a flexible, cost-effective solution for an integrated battery management system. The monolithic CMOS chip controls the fast charging of nickel-cadmium, nickel-metal-hydride, lead-acid or lithium batteries under microprocessor control. The device 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 30μA and in the idle mode,an ADC reading maybe 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 LTC1325CSW for fault conditions. The charge mode is terminated by the μP while monitoring any combination of battery voltage and temperature, ambient temperature and charge time. The LTC1325CSW also monitors the battery for fault conditions before and during charging. In the gas gauge mode the LTC1325CSW allows the total charge leaving the battery to be calculated.
Fast Charge Nickel-Cadmium, Nickel-Metal-Hydride, Lithium Ion or Lead-Acid Batteries under μP Control
Flexible Current Regulation:
Programmable 111kHz PWM Current Regulator with Built-In PFET Driver
PFET Current Gating
Discharge Mode
Measures Battery Voltage, Battery Temperature and Ambient Temperature with Internal 10-Bit ADC
Battery Voltage, Temperature and Charge Time Fault Protection
Built-In Voltage Regulator and Programmable Battery Attenuator
Easy-to-Use 3- or 4-Wire Serial μP Interface
Accurate Gas Gauge Function
Wide Supply Range: VDD = 4.5V to 16V
Can Charge Batteries with Voltages Greater Than VDD
Can Charge Batteries from Charging Supplies Greater Than VDD
Digital Input Pins Are High Impedance in Shutdown Mode
Applications
System Integrated Battery Charger
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