DC to DC Power Supplies (Converters)
Boost Converter has Schottky diode and output disconnect.
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Press Release Summary:
Step-up micropower DC/DC converters LT3473 and LT3473A have 2.2-16 V input voltage range and solution size of less than 50 mm². They operate from single cell Li-Ion batteries up to fixed 15 V input rails, delivering outputs to 34 V. With constant 1.2 MHz switching frequency, products feature internal 1 A, 36 V switch, internal reference override pin, and 2 additional NPN transistors. Automatic Burst Mode® operation reduces quiescent current to 150 µA at no load.
Original Press Release:
1A, 1.2MHz Micropower Boost Converter with Integrated Schottky Diode and Output Disconnect
Milpitas, CA - April 11, 2005 - Linear Technology Corporation announces the LT3473, a 1A, 1.2MHz step-up micropower DC/DC converter with an integrated Schottky diode and output disconnect circuitry in a low profile DFN package. The small package size, high level of integration and the use of tiny SMT components yield a solution size of less than 50mm2.
The LT3473's 2.2V to 16V input voltage range enables it to operate from single cell Li-Ion batteries up to fixed 15V input rails, delivering outputs up to 34V. Its constant 1.2MHz switching frequency allows designers to keep switching noise out of noise-sensitive circuitry and enables the use of tiny capacitors and inductors. The internal 1A switch allows the device to deliver up to 80mA at 25V from a Li-Ion cell, making it ideal for OLED and TFT display applications. Automatic Burst Mode® operation reduces quiescent current to 150uA at no load, maximizing battery run-time. An auxiliary reference input (CTRL) allows the user to override the internal 1.25V feedback reference with any lower value, ensuring full control of the output voltage during operation. Additional features include: a power good flag and thermal shutdown.
The LT3473A includes two additional NPN transistors for generating intermediate bias voltages from the output and is offered in a 4mm x 3mm DFN-12 package. The LT3473 does not include these NPNs and is offered in a 3mm x 3mm DFN-8 package.
The LT3473 and LT3473A are both available from stock in a 3mm x 3mm DFN and 3mm x 4mm DFN package respectively. Pricing starts at $1.95 each for the LT3473 and $2.05 each for the LT3473A, both in 1,000 piece quantities.
Summary of Features: LT3473/A
Tiny Solution Size
Low Quiescent Current:150uA, <1uA in Shutdown Mode
Internal 1A, 36V Switch
Integrated Schottky Diode and PNP Output Disconnect
Internal Reference Override Pin
25V at 80mA from 3.6V Input
Auxiliary NPNs for Intermediate Bias Voltages (LT3473A)
Automatic Burst Mode Operation at Light Load
Constant Switching Frequency: 1.2MHz
Thermal Shutdown
Low Profile (3mm x 3mm) DFN Package (LT3473)
Low Profile (4mm x 3mm) DFN Package (LT3473A)
Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. 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, 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.
LT, LTC and Burst Mode are registered trademarks of Linear Technology Corp.
Worldwide Contacts
North America
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233
ddickinson@linear.com
China (PRC)
Fanny Lau
Tel: 852-2428-0303
flau@linear.com
Angela Ao
Tel: (8610)6522 8081
angela@eba.com.cn
Germany
Ralf Stegmann
Tel: +49 (0) 7131/9234-0
ralf@ezwire.com
Japan
Kazuto Takahashi
Tel: 81-3-5226-7291
takahashi@linear-tech.co.jp
UK & Scandinavia
Alan Timmins
Tel: +44-1-252-629937
a.timmins@ntlworld.com
Korea
Desiree Park
Tel: +82 (0) 2812 1144
desiree@ezwire.com
