Step-Down Regulator requires 75 µA quiescent current.
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Press Release Summary:
Supplied in MSOP-16 package, LT3695 operates from 3.6-36 V input and can safely sustain transient voltages up to 60 V. Regulator is designed to tolerate single fault conditions and has 1.45 A internal switch that can deliver up to 1 A continuous output current at voltages as low as 0.8 V. Switching frequency is user-programmable from 250 kHz to 2.2 MHz, and output ripple is rated below 15 mVPK-PK. Also, current mode topology promotes accelerated transient response and loop stability.
Original Press Release:
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 75µA 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.
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 -40C 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.
Summary of Features: LT3695
Wide Input Range: Operation from 3.6V to 36V, Overvoltage Lockout Protects Circuits Through 60V Transients
FMEA Fault Tolerant:
1A Output Current
Low Ripple (< 15mVP-P) Burst Mode® Operation:
IQ = 75µA 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, 1A (IOUT), Fault Tolerant Micropower
Step-Down Switching Regulator
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, µModule® 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, µModule, Burst Mode and are registered trademarks of Linear Technology Corp. All other trademarks are the property of their respective owners.
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
