LTC1980EGN
发布时间：2018/5/16
概述
The LTC1980EGN integrates PWM power control for charging a battery and converting the battery voltage to a regulated output or simultaneously charging the battery while powering a system load from an unregulated AC wall adapter. Combining these features into a single IC produces a smaller area and lower cost solution compared to presently available multi-IC solutions. The LTC1980EGN shares the discrete components for both the battery charger and the DC/DC converter thus minimizing size and cost relative to dual controller solutions. Both the battery charger and DC/DC converter use a current mode flyback topology for high efficiency and excellent transient response. Optional Burst Mode operation and power-down mode allow power density, efficiency and output ripple to be tailored to the application.
The LTC1980EGNprovides a complete Li-Ion battery charger with charge termination timer, preset Li-Ion battery voltages, overvoltage and undervoltage protection, and userprogrammable constant-current charging. Automatic battery recharging, shorted-cell detection, and open-drain C/10 and wall plug detect outputs are also provided. User programming allows NiMH and NiCd battery chemistries to be charged as well.
特点
Single Controller IC Includes Battery Charger Plus DC/DC Converter
Wall Adapter Voltage May be Above or Below Battery Voltage
LDO Controller Allows Simultaneous Charging and Regulating from Wall Adapter Input
Standalone Li-Ion Battery Charger Including Charge Termination, Overvoltage Protection, Shorted-Cell Detection and Battery Recharge
Selectable 4.1V, 4.2V, 8.2V and 8.4V Float Voltages
Simple NiMH and NiCd Battery Charger
Pin Programmable Regulator Burst Mode? Operation and Shutdown for High Efficiency
High Efficiency Current Mode 300kHz PWM
Reduced Component Architecture
Undervoltage Protection and Soft-Start Insures Start-Up with Current Limited Wall Adapter
Small 24-Pin SSOP Package
Applications
Digital Cameras
Handheld Computers
Personal Digital Assistants
1W to 10W Uninterruptable Power Supplies
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