36V, with 70V Transient Protection, 2.6A(IOUT), 2.5MHz Step-Down DC/DC Converter with Dual Linear Controllers

News Release ⎜ www.linear.com
36V, with 70V Transient Protection, 2.6A(IOUT), 2.5MHz Step-Down
DC/DC Converter with Dual Linear Controllers
MILPITAS, CA – November 18, 2010 – Linear Technology Corporation announces the LT3694,
a 2.6A, 36V step-down switching regulator with dual linear controllers, packaged in a 4mm x
5mm QFN or TSSOP-20E. The LT3694 operates from a VIN range of 4V to 36V with transient
protection to 70V, making it ideal for load dump and cold-crank conditions found in automotive
applications. Its internal 3.5A switch can deliver up to 2.6A of continuous output current at
voltages as low as 0.75V. Its switching frequency is user-programmable from 250kHz to
2.5MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive
frequency bands. Each integrated LDO controller has an accurate programmable current limit up
to 1A to provide an additional level of reliability. Combined with NPN transistors, they can be
used to offer dual low noise outputs in addition to the primary channel. Although the LDO
controllers can be powered by independent inputs, powering them from the primary switching
output ensures both high efficiency and low noise. The combination of its 4mm x 5mm QFN
package (or thermally enhanced TSSOP-20E) and high switching frequency, which keeps
external capacitors and inductors small, provides a compact, thermally efficient footprint.
The LT3694’s main switcher utilizes a high efficiency 3.5A switch, with the necessary
oscillator, control, logic circuitry and LDO controllers integrated into a single die. Special design
techniques enable high efficiency over a wide input voltage range and its current mode topology
enables fast transient response and excellent loop stability. A diode current limit pin offers an
36V, with 70V Transient Protection, 2.6A(IOUT), 2.5MHz Step-Down
DC/DC Converter with Dual Linear Controllers
page 2
additional level of overload protection. Other features include a power good flag, independent
tracking/soft-start pins and programmable undervoltage lockout.
The LT3694 also provides synchronization capability. The LT3694-1 version is available
if a clock output signal is required to synchronize other external devices. The LT3694EUFD and
LT3694-1EUFD are offered in a 4mm x 5mm 28-lead QFN package, priced at $3.85 each. The
LT3694EFE and LT3694-1EFE are offered in a 20-lead, thermally enhanced TSSOP package,
priced at $4.00 each. The LT3694IUFD and LT3694-1IUFD are tested and guaranteed to
operate from a -40°C to 125°C operating junction temperature, priced at $4.24 each. The
LT3694IFE and LT3694-1IFE are tested and guaranteed to operate from a -40°C to 125°C
operating junction temperature. Both are offered in a 20-lead, thermally enhanced TSSOP
package and are priced from $4.00 each. All prices are for 1,000-piece quantities and all versions
of the LT3694 are available from stock. For more information, visit www.linear.com/3694
Photo Caption: 36V, 2.6A(IOUT), Step-Down DC/DC Converter with Dual Linear Controllers
Summary of Features: LT3694/-1
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Wide Input Range: 4V to 36V
Overvoltage Shutdown Protects Circuit through 70V Transients
2.6A Output Switching Regulator with Internal Power Switch
Dual, Low Dropout, Linear Regulator Controllers with Programmable Current Limit
Tracking/Soft-Start Inputs & Power Good Output Simplify Soft-Start & Supply Sequencing
Uses Small Inductors & Ceramic Capacitors
VOUT(MIN) = 0.75V (Buck & LDOs)
Adjustable 250kHz to 2.5MHz Switching Frequency
Accurate Enable Threshold Allows User Programmable Undervoltage Lockout
Options for Clock Synchronization (LT3694) or Clock Output to Enable Synchronization to Other
Switching Regulators (LT3694-1)
Thermally Enhanced 28-Lead 4mm × 5mm QFN & 20-Lead TSSOP Packages
36V, with 70V Transient Protection, 2.6A(IOUT), 2.5MHz Step-Down
DC/DC Converter with Dual Linear Controllers
page 3
About Linear Technology
Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing
and marketing a broad line of high performance analog integrated circuits for major companies
worldwide for three decades. The Company’s products provide an essential bridge between our
analog world and the digital electronics in communications, networking, industrial, automotive,
computer, medical, instrumentation, consumer, and military and aerospace systems. Linear
Technology produces power management, data conversion, signal conditioning, RF and interface
ICs, and µModule® subsystems.
LT, LTC, LTM, µModule 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
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