Features and Benefits
- Wide Voltage Range: 4.5V to 55V Input, Up to 55V Output (60V Absolute Maximums)
- Synchronous Buck-Boost DC/DC Controller
- Li-Ion and Lead-Acid Charge Algorithms
- ±0.5% Float Voltage Accuracy
- ±5% Charge Current Accuracy
- Instant-On for Heavily Discharged Batteries
- Ideal Diode Controller Provides Low Loss PowerPath When Input Power is Limited
- Input Voltage Regulation for High Impedance Input Supplies and Solar Panel Peak Power Operation
- Onboard Timer for Protection and Termination
- Bad Battery Detection with Auto-Reset
- NTC Input for Temperature Qualified Charging
- Binary Coded Open-Collector Status Pins
- Low Profile (0.75mm) 38-Pin 5mm × 7mm QFN Package
The LTC4020 is a high voltage power manager providing PowerPath™ instant-on operation and high efficiency battery charging over a wide voltage range. An onboard buck-boost DC/DC controller operates with battery and/or system voltages above, below, or equal to the input voltage.
The LTC4020 seamlessly manages power distribution between battery and converter outputs in response to load variations, battery charge requirements and input power supply limitations.
The LTC4020 battery charger can provide a constant-current/constant-voltage charge algorithm (CC/CV), constant-current charging (CC), or charging with an optimized 4-step, 3-stage lead-acid battery charge profile. Maximum converter and battery charge currents are resistor programmable.
The IC's instant-on operation ensures system load power even with a fully discharged battery. Additional safety features include preconditioning for heavily discharged batteries and an integrated timer for termination and protection.
- Portable Industrial and Medical Equipment
- Solar-Powered Systems
- Military Communications Equipment
- 12V to 24V Embedded Automotive Systems
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Demonstration circuit 2044A is a 55V buck-boost multi-chemistry battery charger featuring the LTC4020. The board will accept an input voltage between 15V and 55V. The float voltage of the battery output (BAT) is 25.2V, with 3.3A maximum charge current. The converter out-put (VOUT) has a voltage range of 21V to 28V, with 3A maximum load current. The LTC4020 contains a high efficiency synchronous buck-boost DC/DC controller and uses a proprietary average current mode architecture.
The LTC4020 battery charger can provide a constant-current/constant-voltage charge algorithm (CC/CV, with MODE pin grounded), constant-current charging (CC, with MODE pin floated), or charging with an optimized 4-step, 3-stage lead-acid battery charge profile (connect MODE pin to INTVCC, with a 0Ω jumper at the optional R29 position).
The LTC4020 data sheet gives a complete description of the IC operation and application information. The data sheet must be read in conjunction with the quick start guide.
Demonstration circuit 2134A is a high power buck-boost multichemistry battery charger featuring the LTC4020. The board will accept an input voltage between 15V and 55V. The float voltage of the battery output (BAT) is 25.2V, with 6.3A maximum charge current. The converter output (VOUT) has a voltage range of 21V to 28V, with 8A maximum load current. The LTC4020 contains a high efficiency synchronous buck-boost DC/DC controller, and uses a proprietary average current mode architecture.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
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