Versatile 55VIN/55VOUT Buck-Boost Battery Charging Controller

Versatile 55VIN/55VOUT Buck-Boost Battery Charging Controller
News Release 
Versatile 55VIN/55VOUT Buck-Boost Battery Charging Controller
Offers Multi-Chemistry Operation & PowerPath Control
MILPITAS, CA – November 5, 2013 – Linear Technology Corporation introduces the LTC4020,
an advanced high voltage power manager and multi-chemistry battery charger designed to
efficiently transfer power from a variety of sources to a system power supply rail and a battery.
The device offers precision charge current regulation, ±0.5% charge voltage regulation and
operates across a wide 4.5V to 55V input voltage range compatible with a variety of different
input voltage sources. With an output voltage range up to 55V and three selectable termination
algorithms, the LTC4020 accommodates an equally wide variety of battery stack voltages and
chemistries. The LTC4020 contains a step-up/step-down DC/DC controller, enabling operation
with battery voltages that are above, below or equal to the input voltage (VIN). Typical
applications include portable industrial and medical equipment, solar-powered systems, military
communications equipment, plus 12V to 24V embedded automotive systems.
The LTC4020 features an intelligent PowerPath™ topology that reduces the voltage range
required by downstream system components to that of the expected battery voltage range rather
than the full extent of the input voltage source. However, instant-on operation still ensures
system load power with a fully discharged battery. Furthermore, this topology preferentially
provides power to the system load when input power is limited – the device’s ideal diode
controller guarantees that ample power is always available to VOUT if there is insufficient power
available from the DC/DC converter. A maximum power point control (MPPC) circuit features
Versatile 55VIN/55VOUT Buck-Boost Battery Charging Controller
Offers Multi-Chemistry Operation & PowerPath™ Control
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an input voltage regulation loop, which controls charge current to hold the input voltage at a
programmed level, ideal for high impedance input or solar panel-powered applications. When no
input supply is present, the battery drain current is reduced to only 10μA, maintaining maximum
stored capacity.
The LTC4020’s three pin-selectable charging profiles are optimized for a variety of
battery chemistries. The LTC4020 can provide a constant-current/constant-voltage (CC/CV)
charge characteristic with either C/10 or timed termination for use with lithium-based battery
systems including Li-Ion, Li-polymer and LiFePO4. A constant-current (CC) characteristic with
timed termination can be used for charging supercapacitors or trickle charging nickel-based
batteries. Finally, a 4-step, 3-stage lead-acid charge profile works well with all types of lead-acid
batteries including sealed, AGM and flooded. An integrated timer controls termination during
CC/CV charging, as well as additional protection during battery preconditioning and absorption
charging for lead-acid batteries. Two digital open-drain outputs provide charger status and signal
fault conditions. These binary coded pins signal battery charging, standby or shutdown modes,
battery temperature faults and bad battery faults. Other features of the battery charger include:
temperature-qualified charging using an NTC thermistor, automatic recharge and precondition
low current charging for deeply discharged cells.
The LTC4020 is housed in a low profile (0.75mm) 38-pin 5mm x 7mm QFN package
with a backside metal pad for excellent thermal performance. The device is guaranteed for
operation from -40C to 125C. 1,000-piece pricing starts at $4.95 each. For more information,
Versatile 55VIN/55VOUT Buck-Boost Battery Charging Controller
Offers Multi-Chemistry Operation & PowerPath™ Control
page 3
Photo Caption: 55VIN/55VOUT Buck-Boost Power Manager Charger Controller
Summary of Features: LTC4020
Wide Voltage Range: 4.5V to 55V Input, 2.5V to 55V Output (60V Absolute Maximum)
Synchronous Buck-Boost DC/DC Controller
Lithium-based & Lead-Acid Charge Algorithms
±0.5% Float Voltage Accuracy
±5% Charge Current Accuracy
Instant-On Operation for Heavily Discharged Batteries
Ideal Diode Controller Provides Low Loss PowerPath ™ When Input Power is Limited
Input Voltage Regulation for High Impedance Input Supplies &
Solar Panel Peak Power Operation
Onboard Timer for Protection & Termination
Bad Battery Detection with Auto-Reset
NTC Input for Temperature Qualified Charging
Binary Coded Open-Collector Status Pins
38-Pin 5mm × 7mm x 0.75mm QFN Package
About Linear Technology Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for over three decades. The Company’s products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface ICs, µModule® subsystems, and wireless sensor network products. For more information, visit
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks and PowerPath is a
trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
[email protected]
Tel: 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233
Versatile 55VIN/55VOUT Buck-Boost Battery Charging Controller
Offers Multi-Chemistry Operation & PowerPath™ Control
page 2
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