Linear Technology : 140V, 400mA Step-Down Converter with Only 12µA Quiescent Current

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MILPITAS, CA ­ February 5, 2015 ­ Linear Technology announces the LTC7138, a 140V input­capable high efficiency buck converter that delivers up to 400mA of continuous output current. It operates from an input voltage range of 4V to 140V, making it ideal for a wide range of telecom, industrial, avionic and automotive applications. The LTC7138 utilizes a programmable hysteretic mode design to optimize efficiency over a broad range of output currents. It utilizes an internal 1.8 Ohm power MOSFET for robust, high efficiency operation. A user­programmable output current limit can set output current from 100mA to 400mA as required by the particular application. The LTC7138 can be programmed with fixed output voltages of 1.8V, 3.3V or 5V, or a resistor divider can be used to
program outputs from 0.8V to VIN. The LTC7138's thermally enhanced MSOP offers additional pin spacing required for high voltage inputs. The combination of its MSOP and only four tiny externals provides a highly compact solution
footprint for a wide array of applications.
The LTC7138 draws only 12µA at no load while maintaining output voltage regulation, making it ideal for always­on battery­powered applications. Due to the inherent stability of the converter, no external compensation is required thereby simplifying design and minimizing the solution footprint. Additionally, features include a precise 0.8V ±1% feedback voltage reference, 100% duty cycle dropout operation and, internal or external soft­start, and a feedback comparator output which enables multiple LTC7138s to be connected in parallel for higher current applications.
Pricing for the LTC7138EMSE, starts at $3.80 each. An industrial temperature version, the LTC7138IMSE, is guaranteed to operate from a ­40°C to 125°C operating junction temperature and is priced at $4.18 each. Furthermore, an automotive temperature version, the LTC7138HMSE, is specified to operate from a ­40°C to 150°C operating junction temperature and is priced at $4.43 each. Finally, a high reliability version, the LTC7138MPMSE, is tested and guaranteed to operate from a ­55°C to 150°C operating junction temperature and is priced at $11.29
each. All pricing is for 1,000­piece quantities and all versions are available from stock. For more information, visit www.linear.com/product/LTC7138.

Wide Operating Input Voltage Range:

4V to 140V

Internal Low Resistance Power

MOSFET

Inherently Stable: No Compensation

Required

Adjustable 100mA to 400mA Maximum

Output Current

Low Dropout Operation: 100% Duty

Cycle

Low Quiescent Current: 12µA Wide Output Range: 0.8V to VIN

0.8V ±1% Feedback Voltage Reference

Precise RUN Pin Threshold Internal or External Soft­Start Programmable 1.8V, 3.3V, 5V or Adjustable Output

Few External Components Required Programmable Input Overvoltage Lockout

Thermally Enhanced High Voltage

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.

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.

John Hamburger
Tel: (408) 432­1900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com

Fanny Lau
Tel: 852­2428­0303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com

Yoshikazu Funasaki Tel: 81­3­5226­7291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81­3­3255­8411 linear@chugai­ad.co.jp

Desiree Park
Tel: +82­2­565­6625 desiree@ezwire.com

Alice Wang
Tel: +886­2­28974705 alice@ezwire.com

Ralf Stegmann
Tel: +49 (0) 71319234­11 ralf@ezwire.com

Alan Timmins
Tel: +44­1252­629937 alan@ezwire.com

Simona Labianca
Tel: +39 340 0571697 simona@ezwire.com

Clotilde Zeller
Tel: +33 1 4614 87 09 clotilde@ezwire.com

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