LTC4020 - 55V Buck-Boost Multi-Chemistry Battery Charger
Features
- 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
Typical Application
Description
The LTC®4020 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), constantcurrent 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.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC4020EUHF#PBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC4020EUHF#TRPBF | 5x7 QFN-38 | UHF | E | 05-08-1701 | Yes |
| LTC4020IUHF#PBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
| LTC4020IUHF#TRPBF | 5x7 QFN-38 | UHF | I | 05-08-1701 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC4020EUHF#PBF | 5x7 QFN-38 | E | $7.07 | $4.95 | Yes | |
| LTC4020EUHF#TRPBF | 5x7 QFN-38 | E | $5.01 | Yes | ||
| LTC4020IUHF#PBF | 5x7 QFN-38 | I | $8.07 | $5.65 | Yes | |
| LTC4020IUHF#TRPBF | 5x7 QFN-38 | I | $5.71 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2044A | LTC4020EUHF Demo Board | Multi-Chemistry 15V to 55VIN, Buck-Boost Battery Charger: up to 25.2Vbat @3.3A | $200.00 | |
| DC2134A | LTC4020EUHF Demo Board | 15V to 55VIN, 6.3A Multi-Chemistry, Buck-Boost Battery Charger, up to 25.2Vbat | $250.00 | |
| Buy Now | |||
Applications
- Portable Industrial and Medical Equipment
- Solar-Powered Systems
- Military Communications Equipment
- 12V to 24V Embedded Automotive Systems
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC4020
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
