LTC4020

RECOMMENDED FOR NEW DESIGNS

55V Buck-Boost Multi-Chemistry Battery Charger

Data Sheet (Rev. E) Product Selection Table
Part Models
4
1ku List Price
Starting From $5.90
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Part Details

  • 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
LTC4020
55V Buck-Boost Multi-Chemistry Battery Charger
Buck-Boost DC/DC Converter Controller with PowerPath Battery Charger Accepts Inputs from 4.5V to 55V and Produces Output Voltages Up to 55V 5V to 30V 6-Cell Lead-Acid Supply/Charger Maximum Power Efficiency vs VIN (Application Circuit on Page 37) Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 4

Application Note 1

Design Note 1

Technical Articles 2

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Hardware Ecosystem

Parts Product Life Cycle Description
PowerPath, Ideal Diodes, and Load Switches 1
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
Pushbutton Controllers 1
LTC2956
RECOMMENDED FOR NEW DESIGNS Wake-Up Timer with Pushbutton Control
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC4020
LTspice

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.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2044B

LTC4020EUHF | High Voltage Buck-Boost Multi-Chemistry Battery Charger

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Product Details

Demonstration circuit 2044B 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 output (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); a four-step, three-stage lead-acid battery-charge profile or constant-current charging (CC). Battery-chemistry type is selected using on-board jumper JP1.

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.

eval board
schematic 5
schematic 6
schematic 7
schematic 8
DC2134B

LTC4020EUHF | High Power Buck-Boost Multi‑Chemistry Battery Charger

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Product Details

Demonstration circuit 2134B is a high power 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 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.

The LTC4020 battery charger can provide a constantcurrent/constant-voltage charge algorithm (CC/CV); a four-step, three-stage lead-acid battery-charge profile or constant-current charging (CC). Battery-chemistry type is selected using onboard jumper JP1.

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.
DC2044B
LTC4020EUHF | High Voltage Buck-Boost Multi-Chemistry Battery Charger
DC2044B Evaluation Board DC2044B Evaluation Board - Top View DC2044B Evaluation Board - Bottom View DC2044B - Proper Measurement Equipment Setup
DC2134B
LTC4020EUHF | High Power Buck-Boost Multi‑Chemistry Battery Charger
DC2134B Evaluation Board DC2134B Evaluation Board - Top View DC2134B Evaluation Board - Bottom View DC2134B - Proper Measurement Equipment Setup

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