DC to DC Power Supplies (Converters)
DC/DC Controller operates at junction temperatures to 140°C.
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Press Release Summary:
Providing ac and dc load and line regulation, H-Grade version of LTC1772 provides ±2.5% output voltage accuracy and consumes 270 µA of quiescent current. Current mode, step down, dc/dc controller incorporates undervoltage lockout feature for when input voltage falls below 2.0 V. Configured for Burst Mode® operation, product comes in 6-lead ThinSOT(TM) package, delivers efficiencies up to 94%, and offers constant frequency 550 kHz operation.
Original Press Release:
550kHz, Current Mode Step-Down DC/DC Controller in ThinSOT Offers 140°C Maximum Junction Temperature
MILPITAS, CA - August 3, 2005 - Linear Technology Corporation announces the "H-Grade" version of the LTC1772. The LTC1772 is a constant frequency current mode step down DC/DC controller providing excellent AC and DC load and line regulation. The "H" Grade version operates up to a junction temperature of 140°C, compared to the "E" and "I" Grade versions' 125°C maximum junction temperature. All electrical specifications are identical for the E, I and H grade versions. The "H Grade" parts are both tested and guaranteed to the maximum junction temperature of 140°C. They are ideal for automotive and industrial applications which are subjected to high ambient temperatures.
The LTC1772 provides a ± 2.5% output voltage accuracy and consumes only 270uA of quiescent current. It incorporates an accurate undervoltage lockout feature that shuts down the LTC1772 when the input voltage falls below 2.0V. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode® operation, which enhances efficiency at low output current.
The LTC1772HS6 is available from stock in a ThinSOT(TM) package. Pricing starts at $2.30 each for 1,000-piece quantities.
Summary of Features: LTC1772H
High Efficiency: Up to 94%
High Output Currents Easily Achieved
Wide VIN Range: 2.5V to 9.8V
Constant Frequency 550kHz Operation
Burst Mode Operation at Light Load<1uA
Low Dropout: 100% Duty Cycle
Tiny 6-Lead ThinSOT Package
0.8V Reference Allows Low Output Voltages
Current Mode Operation for Excellent Line and Load Transient Response
Low Quiescent Current: 270uA
Shutdown Mode Draws Only 8uA Supply Current
2.5% Reference Accuracy
Maximum Junction Temperature of 140° C
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 and ThinSOT is a trademark of Linear Technology Corp.
Worldwide Contacts
North America and General Information
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
Taiwan
Alice Wang
Tel: + 886-2-28974705
alicesh.wang@msa.hinet.net
