High Input Pre-Regulator suits battery charger applications.
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Press Release Summary:
Supplied in 2 x 3 mm DFN package, LT3653 monolithic current mode step-down switching regulator utilizes 1.5 MHz oscillator, internal compensation, and internal boost diode. Input range of 7.5-30 V supports range of sources, input overvoltage lockout protects device from input transients to 60 V, and adjustable output current limit can be set from 400 mA to 1.2 A. Control pin VC is available for external battery tracking, keeping output voltage 300 mV above Li-Ion battery voltage.
Original Press Release:
1.2A(IOUT), 1.5MHz High Input Voltage Pre-Regulator with Output Current Limit for Battery Charger Applications
MILPITAS, CA - August 25, 2008 - Linear Technology Corporation announces the LT3653, a 1.2A, 1.5MHz monolithic current mode step-down switching regulator with a programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize battery charger efficiency. Its wide operating input voltage of 7.5V to 30V makes the LT3653 ideal for a variety of input sources including unregulated 12V wall adapters, 24V industrial supplies and Firewire as well as automotive applications. Onboard input overvoltage lockout protects the device through input transients as high as 60V, such as those commonly found in automotive applications.
The LT3653's control pin, VC is available for external battery tracking, known as Bat-Track(TM) control. This function keeps the output voltage only 300mV above the Li-Ion battery voltage, which minimizes thermal issues while simultaneously optimizing charger efficiency. Similarly, the LT3653 offers an adjustable output current limit which can be set between 400mA and 1.2A via an external resistor. The LT3653 does not allow reverse discharge from the battery to VIN, eliminating the need for a blocking FET. It also utilizes a 1.5MHz oscillator, internal compensation and an internal boost diode to minimize the overall solution footprint. Combined with a 2mm x 3mm DFN package, the LT3653 offers a very compact high voltage input regulator for battery charger applications.
The LT3653EDCB pricing starts at $2.50 each for 1,000 piece quantities. An industrial grade, the LT3653IDCB is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and are priced at $2.88 each for 1,000 piece quantities. Both versions are available from stock.
Summary of Features: LT3653
Wide Input Range:
oOperation from 7.5V to 30V
oOvervoltage Lockout Protects Circuit through 60V
Transients
Operates with LTC Bat-Track(TM) Li-Ion Battery Chargers to Maximize Efficiency
No Reverse Discharge Path from VOUT to VIN
Programmable Output Current Limit
Integrated BOOST Diode
Thermal Protection
Small Application Size
Thermally Enhanced 2mm - 3mm DFN Package
30V (60VMAX), 1.2A (IOUT) Input Regulator with Output Current Limit
About Linear Technology
Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.
LT, LTC and LTM are registered trademarks and uModule and Bat-Track are trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
