Linear Technology : 20V, 200mA RF LDO with Ultralow (0.8µV ) Noise & 79dB PSRR at 1MHz Powers NoiseSensitive

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MILPITAS, CA ­ February 23, 2015 ­ Linear Technology Corporation announces the LT3042, a leading­edge,
ultralow noise, ultrahigh power supply ripple rejection (PSRR) low dropout voltage linear regulator. Its unique design features ultralow spot noise of only 2nV/√Hz at 10kHz and 0.8µVRMS integrated output noise across a wide 10Hz to
100kHz bandwidth. Low and high frequency PSRR performance are exceptional. Low frequency PSRR exceeds
90dB out to 10kHz and high frequency PSRR exceeds 75dB out to 3MHz, quieting noisy or high ripple input supplies. The LT3042 utilizes LTC's proprietary LDO architecture­a precision current source reference followed by a high performance unity gain buffer, resulting in virtually constant bandwidth, noise, PSRR and load regulation performance independent of output voltage. In addition, this architecture permits paralleling of multiple LT3042s to further decrease noise, increase output current and spread heat on a printed circuit board (PCB).

The LT3042 delivers up to 200mA output current with a 350mV dropout voltage at full load, across a wide 1.8V to 20V input voltage range. Output voltage range is 0V
to 15V and output voltage tolerance is highly accurate at ±2% over line, load and temperature. The device's wide input and output voltage ranges, high bandwidth, high PSRR and ultralow noise performance make it ideal for powering noise­sensitive applications such as: PLLs
/ VCOs / mixers / LNAs, very low noise instrumentation, high speed/high precision data converters, medical applications such as imaging and diagnostics, precision power supplies and as a post regulator for switching supplies.
The LT3042 operates with a small, low cost, 4.7µF ceramic output capacitor, optimizing stability and transient response. A single resistor programs the external precision current limit (±10% over temperature). A single SET pin capacitor lowers output noise and provides reference soft­start functionality, preventing output voltage overshoot at turn on. Moreover, the device's internal protection circuitry includes reverse battery protection, reverse current protection, internal current limit with foldback and thermal limit with hysteresis. Other features include fast start­up capability (useful if large value SET pin capacitors are used) and a power good flag with programmable threshold to indicate output voltage regulation.
The LT3042 is available in thermally enhanced 10­lead 3mm x 3mm DFN and 10­lead MSOP packages, both with a compact footprint. The E­ and I­grade versions are available from stock with an operating junction temperature of
­40°C to 125°C. The high temperature H grade is rated from ­40°C to 150°C, and the high reliability MP­grade version is specified from ­55°C to 150°C. Devices are in stock, and pricing starts at $2.25 each for the E grade in
1,000­piece quantities. For more information, visit www.linear.com/product/LT3042

Ultralow RMS Noise: 0.8µVRMS (10Hz to

100kHz)

Ultralow Spot Noise: 2nV/√Hz at 10kHz

Ultrahigh PSRR: >90dB to 10kHz and

>75dB to 3MHz

Output Current: 200mA

Wide Input Voltage Range: 1.8V to 20V Single Capacitor Improves Noise & PSRR

100µA SET Pin Current: ±1% Initial

Accuracy

Single Resistor Programs Output Voltage

High Bandwidth: 1MHz Programmable Current Limit Low Dropout Voltage: 350mV

Output Voltage Range: 0V to 15V Power Good Flag with Programmable Threshold

Fast Start­Up Capability

Precision Enable/UVLO

Can Be Paralleled for Lower Noise & Higher Current

Internal Current Limit with Foldback

Minimum Output Capacitor:

4.7µF Ceramic

Reverse Battery & Reverse Current

Protection

10­Lead MSOP & 3mm x 3mm DFN Packages

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

Ralf Stegmann
Tel: +49 (0) 7131 9234­11 ralf@ezwire.com

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

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

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

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

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

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