LTC4020 Buck-Boost, Step-up/Step-down Battery Charger

Linear Technology’s LTC4020 synchronous buck-boost DC/DC controller for portable applications

Image of Linear Technology's LTC4020 Battery ChargerLTC’s LTC4020 is a buck-boost, step-up/step-down, multi-chemistry battery charger/controller. This charger provides 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. This device 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, constant current charging, or charging with an optimized 4-step, 3-stage lead-acid battery charge profile. Maximum converter and battery charge currents are resistor programmable. The device comes in a 38-QFN package that has a -40°C to +125°C temperature range. The LTC4020 is ideal for battery charging/monitoring for portable electronics found in test, measurement, and medical applications.

Image of Linear Technology's LTC4020 Typical Application
  Image of Linear Technology's LTC4020 Typical Application
Features
  • 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
  • Voltage supply: 4.5 V to 55 V
  • Package/case: 38-QFN (5 x 7)
Applications    
  • Battery charging/monitoring
  • Portable electronics
  • Test, measurement, and medical
  • 12 V to 24 V automotive applications
 
  • Solar powered
  • Tablets/laptops
  • Smartphones

LTC4020 Battery Charger Eval Boards

View DetailsImageManufacturer Part NumberDescriptionAvailable QuantityView Details
BOARD EVAL FOR LTC4020EUHFDC2044ABOARD EVAL FOR LTC4020EUHF25 - Immediate
50 - Factory Stock
View Details
BOARD EVAL FOR LTC4020EUHFDC2134ABOARD EVAL FOR LTC4020EUHF10 - Immediate
407 - Factory Stock
View Details

LTC4020 Batter Charger ICs

View DetailsImageManufacturer Part NumberDescriptionAvailable QuantityView Details
IC BATT CHARGER 55V BB 38QFNLTC4020EUHF#PBFIC BATT CHARGER 55V BB 38QFN0View Details
IC BATT CHARGER 55V BB 38QFNLTC4020EUHF#TRPBFIC BATT CHARGER 55V BB 38QFN0View Details
IC BATT CHARGER 55V BB 38QFNLTC4020IUHF#PBFIC BATT CHARGER 55V BB 38QFN0View Details
Published: 2018-01-03