2A Synchronous Step-Down DC/DC Converter Delivers 93% Efficiency at 2MHz and Operates from 3.0V to 42V Inputs

News Release  www.linear.com
2A Synchronous Step-Down DC/DC Converter Delivers 93% Efficiency at
2MHz and Operates from 3.0V to 42V Inputs
MILPITAS, CA – October 27, 2014 – Linear Technology Corporation announces the LT8609, a
2A, 42V input synchronous step-down switching regulator. A unique synchronous rectification
topology delivers 93% efficiency while switching at 2MHz enabling designers to avoid critical
noise-sensitive frequency bands, such as AM radio, while providing a highly compact solution
footprint. Burst Mode® operation keeps quiescent current under 2.5µA in no-load standby
conditions, making it ideal for always-on systems. The LT8609’s 3.0V to 42V input voltage
range makes it ideal for automotive applications which must regulate through cold-crank and
stop-start scenarios with minimum input voltages as low as 3.0V and load dump transients in
excess of 40V. Its internal 3.5A switches can deliver up to 2A of continuous output current with
peak load currents of 3A.
The LT8609 maintains a minimum dropout voltage of only 200mV (at1A) under all
conditions, enabling it to excel in scenarios such as automotive cold-crank. Spread spectrum
frequency modulation and special design techniques offer low-EMI operation to minimize noise
concerns in automotive and industrial environments. Furthermore, a fast minimum on-time of
only 45ns enables 2MHz constant frequency switching from a 16V input to a 1.5V output. The
LT8609’s 10-lead thermally enhanced MSOP package and high switching frequency keeps
external inductors and capacitors small, providing a compact, thermally efficient footprint.
The LT8609 utilizes internal top and bottom high efficiency power switches with the
necessary boost diode, oscillator, control and logic circuitry integrated into a single die. Low
2A Synchronous Step-Down DC/DC Converter Delivers 93% Efficiency at
2MHz and Operates from 3.0V to 42V Inputs
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ripple Burst Mode operation maintains high efficiency at low output currents while keeping
output ripple below 10mVPK-PK. Unique design techniques and a new high speed process enable
high efficiency over a wide input voltage range, and the LT8609’s current-mode topology
enables fast transient response and excellent loop stability. Other features include internal
compensation, a power good flag, output soft start/tracking and thermal protection.
The LT8609EMSE is packaged in thermally enhanced MSOP-10 package and is priced at
$2.50 each. An industrial temperature version, the LT8609IMSE, is tested and guaranteed to
operate from a –40°C to 125°C operating junction temperature and is priced at $2.75. All pricing
is for 1,000 piece quantities and all versions are available from stock. For more information, visit
Photo Caption: 42V, 2A, 2.2MHz Synchronous Step-Down DC/DC Converter Operates from
3.0V to 42V
Summary of Features: LT8609
Wide Input Voltage Range: 3.0V to 42V
2A of Continuous Output Current with 3A Peak Capability
Ultralow Quiescent Current Burst Mode® Operation: 2.5μA IQ Regulating 12VIN to 3.3VOUT, Output
Ripple < 10mVP-P
High Efficiency Synchronous Operation at fSW = 2MHz: 93% Efficiency at 1A, 5VOUT from 12VIN
Fast Minimum Switch-On Time: 45ns
Spread Spectrum Frequency Modulation for Low EMI
Low Dropout Under All Conditions
Minimum Output Voltage of 0.8V
Allows Use of Small Inductors
Adjustable & Synchronizable: 200kHz to 2.2MHz
Current Mode Operation
Accurate 1V Enable Pin Threshold
Internal Compensation
Output Soft-Start & Tracking
Small Thermally Enhanced 10-Lead MSOP Package
The USA list pricing shown is for budgetary use only. International prices may differ due to local
duties, taxes, fees and exchange rates.
2A Synchronous Step-Down DC/DC Converter Delivers 93% Efficiency at
2MHz and Operates from 3.0V to 42V Inputs
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 over 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, µModule® subsystems, and wireless sensor network products. For more information, visit www.linear.com
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks of Linear
Technology Corp. All other trademarks are the property of their respective owners.
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John Hamburger, Director Marketing
[email protected]
Tel: 408-432-1900 ext 2419
Alan Timmins
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Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233