Switching Regulator offers quiescent current of only 75 uA.

Press Release Summary:

Operating on wide input range from 3.6-36 V with input transient protection up to 60 V, LT3682 is suitable for load dump and cold-crank conditions found in automotive applications. Switching frequency is user programmable from 250 kHz to 2.2 MHz, while 1.5 A internal switch can deliver up to 1 A of continuous output current to voltages as low as 0.8 V. Unit features low ripple below 15 mVP-P, Burst Mode® operation, and comes in 10-pin thermally enhanced 3 x 3 mm DFN package.

Original Press Release:

LT3682: 36V Input with 60V Transient Protection, 1A(IOUT), 2.2MHz Step-Down DC/DC Converter Offers Quiescent Current of Only 75µA

MILPITAS, CA - December 17, 2008 - Linear Technology Corporation announces the LT3682, a 1A, 36V input step-down switching regulator with input transient protection up to 60V. Its Burst Mode® operation keeps quiescent current under 75µA in no load standby conditions. The LT3682's 3.6V to 36V input voltage range, with 60V transient ride through, makes it ideal for load dump and cold-crank conditions commonly found in automotive applications. Its 1.5A internal switch can deliver up to 1A of continuous output current to voltages as low as 0.8V. The LT3682's BurstMode operation offers ultralow quiescent current which is well suited for applications such as automotive 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 3mm x 4mm DFN-14 package and high switching frequency keeps external inductors and capacitors small, providing a very compact, thermally efficient footprint.

The LT3682 utilizes a high efficiency 1.5A, 480mohm switch, with the boost diode, oscillator, control and logic circuitry integrated into a single die. Low ripple BurstMode 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 while its 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 soft-start capability.

The LT3682EDE pricing starts at $2.95 each for 1,000 piece quantities. The LT3682IDE is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $3.95 each in 1,000 piece quantities. All versions are available from stock.

For more information, visit www.linear.com.


o Wide Input Range:
Operation from 3.6V to 36V
Overvoltage Lockout Protects Circuits through 60V Transients
o 1A Output Current
o Low Ripple(< 15mVP-P) Burst Mode® Operation: IQ = 75µA at 12VIN to 3.3VOUT
o Adjustable Switching Frequency: 250kHz to 2.2MHz
o Short-Circuit Protected
o Synchronizable Between 300kHz to 2.2MHz
o 0.8V Feedback Reference Voltage
o Output Voltage 0.8V to 20V
o Soft-Start Capability
o Power Good Flag
o Small 10-Pin Thermally Enhanced 3mm x 3mm DFN Package


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