Features

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

Typical Application

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 includes precision 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.