Analog Devices LTC4000

Description

The LTC®4000 is a high voltage, high performance controller that converts many externally compensated DC/DC power supplies into full-featured battery chargers.Features of the LTC4000’s battery charger include: accurate (±0.25%) programmable float voltage, selectable timer or current termination temperature qualified charging using an NTC thermistor, automatic recharge, C/10 trickle charge for deeply discharged cells, bad battery detection and status indicator outputs. The battery charger also includesprecision current sensing that allows lower sense voltages for high current applications.The LTC4000 supports intelligent PowerPath control. An external PFET provides low loss reverse current protection.Another external PFET provides low loss charging or discharging of the battery. This second PFET also facilitates an instant-on feature that provides immediate downstream system power even when connected to a heavily discharged or short faulted battery.The LTC4000 is available in a low profile 28-lead 4mm × 5mm QFN and SSOP packages.

Features

• Complete High Performance Battery Charger WhenPaired with a DC/DC Converter
• Wide Input and Output Voltage Range: 3V to 60V
• Input Ideal Diode for Low Loss Reverse Blockingand Load Sharing
• Output Ideal Diode for Low Loss PowerPath™ andLoad Sharing with the Battery
• Instant-On Operation with Heavily DischargedBattery
• Programmable Input and Charge Current:±1% Accuracy
• ±0.25% Accurate Programmable Float Voltage
• Programmable C/X or Timer Based ChargeTermination
• NTC Input for Temperature Qualified Charging
• 28-Lead 4mm × 5mm QFN or SSOP Packages

Typical applications

• High Performance Portable Instruments
• Notebook/Subnotebook Computers
• Industrial Battery Equipped Devices
• High Power Battery Charger Systems

More information

• Datasheet
• IC product information