36V Input (60V Transient), 1A Fault Tolerant Step-Down Regulator Requires Only 75uA of Quiescent Current

News Release ⎜ www.linear.com
36V Input (60V Transient), 1A Fault Tolerant
Step-Down Regulator Requires Only 75uA of Quiescent Current
MILPITAS, CA – September 3, 2009 – Linear Technology Corporation announces the LT3695,
a fault tolerant 1A, 36V input step-down switching regulator. Its Burst Mode® operation keeps
quiescent current under 75uA in no load standby conditions. The LT3695 operates from a 3.6V
to 36V input voltage range and can safely sustain transient voltages up to 60V, making it ideal
for load dump and cold-crank conditions commonly found in automotive applications. Its 1.45A
internal switch can deliver up to 1A of continuous output current at voltages as low as 0.8V. The
LT3695’s Burst Mode operation provides ultralow quiescent current, well suited for applications
such as automotive, industrial or telecom systems, which demand always-on operation and
optimum battery life. Switching frequency is user programmable from 250kHz to 2.2MHz,
enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency
bands. The combination of its thermally enhanced MSOP-16 package and high switching
frequency, which keeps external inductors and capacitors small, provides a very compact,
thermally efficient footprint.
The LT3695 is designed to tolerate single fault conditions. Shorting two adjacent pins
together or leaving one single pin floating does not raise VOUT or cause damage to the LT3695 or
any downstream electronics, enhancing system reliability.
36V Input (60V Transient), 1A Fault Tolerant
Step-Down Regulator Requires Only 75uA of Quiescent Current
page 2
The LT3695 utilizes a high efficiency 1.45A, 460mV switch, which can deliver
efficiencies as high as 90%. Low ripple Burst Mode operation maintains high efficiency at low
output currents while keeping output ripple below 15mVPK-PK. Special design techniques and a
new high voltage process enable high efficiency over a wide input voltage range, and the
LT3695’s current mode topology enables fast transient response and excellent loop stability.
Other features include external synchronization (from 300kHz to 2.2MHz), a power good flag
and short circuit protection.
The LT3695EMSE pricing starts at $3.25 each for 1,000 piece quantities. The
LT3695IMSE is tested and guaranteed to operate from a -40°C to 125°C operating junction
temperature and is priced at $3.61 each in 1,000 piece quantities. Finally, the LT3695HMSE is
tested and guaranteed to operate from a -40°C to 150°C operating junction temperature and is
priced at $3.86 each in 1,000 piece quantities. All versions are available from stock. For more
information, visit www.linear.com.
Photo Caption: 36V, 1A (IOUT), Fault Tolerant Micropower Step-Down Switching Regulator
Summary of Features: LT3695
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Wide Input Range: Operation from 3.6V to 36V, Overvoltage Lockout Protects Circuits Through
60V Transients
FMEA Fault Tolerant: Output Stays at or Below Regulation Voltage
During Adjacent Pin Short or When a Pin Is Left Floating
1A Output Current
Low Ripple (< 15mVP-P) Burst Mode® Operation: IQ = 75uA for 12VIN to 3.3VOUT with No Load
Adjustable Switching Frequency: 250kHz to 2.2MHz
Short-Circuit Protected
Synchronizable Between 300kHz and 2.2MHz
Output Voltage: 0.8V to 20V
Power Good Flag
Small Thermally Enhanced 16-Pin MSOP Package
36V Input (60V Transient), 1A Fault Tolerant
Step-Down Regulator Requires Only 75uA of Quiescent Current
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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® 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.
LT, LTC, LTM, uModule, Burst Mode and
are registered trademarks 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
Communications
[email protected]
Tel 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
408-432-1900 ext 2233