Overview
The LTC4079EDD#PBF, produced by Analog Devices Inc., is a low quiescent current, high voltage linear charger designed to support a wide range of battery chemistry types, including Li-Ion/Polymer, LiFePO4, Lead-Acid, and NiMH. This device is optimized for energy harvesting applications and features a compact, thermally enhanced 10-lead (3mm x 3mm) DFN package. It offers adjustable battery voltage, charge current, and safety timer, making it versatile for various battery management needs.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VIN Operating Supply Voltage | 2.7 | 60 | V | ||
| VBAT Battery Voltage Range | 60 | V | |||
| VUVLO VIN Undervoltage Lockout | VIN Rising | 2.55 | 2.7 | V | |
| VDUVLO Differential Undervoltage Lockout | VIN-VBAT Rising | -20 | 15 | 80 | mV |
| VDVREG Differential Voltage Regulation | Minimum VIN-VBAT for Charge Current | 120 | 160 | 200 | mV |
| IQ(IN) Input Supply Quiescent Current | Charging | 4 | μA | ||
| Operating Junction Temperature Range | -40 | 125 | °C | ||
| Storage Temperature Range | -65 | 150 | °C | ||
| Maximum Charge Current | 10 | 250 | mA |
Key Features
- Wide Input Voltage Range: 2.7V to 60V
- Adjustable Battery Voltage: 1.2V to 60V
- Adjustable Charge Current: 10mA to 250mA
- Low Quiescent Current While Charging: 4μA
- Ultralow Battery Drain When Shutdown or Charged: < 0.01μA
- Auto Recharge with Integrated Power Device, Current Sensing, and Reverse Current Protection
- Thermal Regulation to Maximize Output Current Without Overheating
- Constant Voltage Feedback with 0.5% Accuracy
- NTC Thermistor Input for Temperature Qualified Charging
- Adjustable Safety Timer
- Input Voltage Regulation for High Impedance Sources
- Open-Drain CHRG Status Output
- AEC-Q100 Qualified for Automotive Applications
Applications
- Embedded Automotive and Industrial Systems
- Backup Battery Charging from Another Battery
- Energy Harvesting Charger
- Thin Film Battery Products
- Battery Management in Various Industrial and Automotive Environments
Q & A
- What is the operating junction temperature range of the LTC4079? The operating junction temperature range is -40°C to 125°C.
- What is the maximum charge current of the LTC4079? The maximum charge current is adjustable from 10mA to 250mA.
- What types of batteries does the LTC4079 support? The LTC4079 supports Li-Ion/Polymer, LiFePO4, Lead-Acid, and NiMH battery chemistry types.
- What is the input supply quiescent current while charging? The input supply quiescent current while charging is typically 4μA.
- Does the LTC4079 have thermal regulation? Yes, the LTC4079 features thermal regulation to maximize output current without overheating.
- How is the charge voltage set for the LTC4079? The charge voltage is set using an external resistor divider from BAT to FB to FBG.
- Is the LTC4079 suitable for automotive applications? Yes, the LTC4079 is AEC-Q100 qualified for automotive applications.
- What is the package type of the LTC4079? The LTC4079 is available in a 10-lead (3mm x 3mm) Plastic DFN package.
- Does the LTC4079 have an open-drain charge status output? Yes, the LTC4079 has an open-drain CHRG status output.
- Can the LTC4079 be used for energy harvesting applications? Yes, the LTC4079 is well-suited for energy harvesting applications.
