Deutsch   |   Français   |   Svensk   |   简体中文   |   繁體中文   |   日本語   |   한국어
Linear Logo News Release | www.linear.com  
 

UltraFast™ Digitally Programmable 5A LDO Features 85mV Dropout & 25uVRMS Noise

MILPITAS, CA - July 27, 2009 - Linear Technology Corporation announces the LT3070, a digitally programmable linear regulator with the lowest dropout voltage, lowest noise and fastest transient response of any monolithic 5A LDO currently available. Dropout voltage at 5A is an ultralow 85mV. Output voltage noise at 5A is only 25uVRMS over a 10Hz to 100kHz bandwidth. The LT3070s 1MHz unity gain bandwidth, coupled with its minimum 15uF ceramic output capacitance, provides a mere 30mV of overshoot/undershoot in response to a fast 4.5A output load step, saving significant bulk capacitance, space and cost. The LT3070 is ideal for efficiently powering low voltage, high current devices such as FPGAs, DSPs, ASICs, microprocessors, sensitive communication supplies, server/storage devices, and post-buck regulation applications.

The LT3070s output voltage is digitally programmable from 0.8V to 1.8V in 50mV increments. Accuracy is tightly specified at ±1% over line, load and temperature. A digital margining feature can adjust system output voltage in increments of ±1%, ±3% or ±5%, advantageous during system development debug. A PowerGood flag indicates if output voltage is in regulation or the device is in UVLO and the flag also provides an early warning indication of a thermal fault. The LT3070s input supply voltage range is 0.95V to 3.0V and its bias supply voltage ranges from 2.2V to 3.6V. The bias supply provides gate drive to the internal NMOS pass device.

Multiple LT3070 devices can be easily paralleled for higher output current and to spread heat across a PCB. A tracking feature can control a buck regulator powering the LT3070s input. This tracking function drives the upstream buck regulator to maintain the LT3070s input voltage at VOUT + 300mV, minimizing power dissipation. If output voltage is dynamically changed, the tracking function automatically adjusts the output voltage of the buck regulator to maintain efficiency. Internal protection circuitry includes UVLO, reverse-current protection, precision current limiting with power foldback and thermal shutdown with hysteresis.

The LT3070 is offered in a thermally enhanced, low profile (0.75mm) 28-lead 4mm x 5mm QFN package, and both E and I grades operate from -40ºC to +125ºC junction temperature range. 1,000-piece pricing starts at $4.20 and $4.80 each, respectively. For more information, visit www.linear.com.

 
Summary of Features: LT3070
Output Current: 5A
Dropout Voltage: 85mV Typical
Digitally Programmable VOUT: 0.8V to 1.8V in
50mV Increments
Digital Output Margining: ±1%, ±3% or ±5%
Low Output Noise: 25uVRMS (10Hz to 100kHz)
Parallelable: Use Two for a 10A Output
Precision Current Limit: ±12%
±1% Accuracy Over Line, Load and Temperature
Stable with Low ESR Ceramic Output Capacitors
(15uF Minimum)
High Frequency PSRR: 30dB at 1MHz
Enable Function Turns Output On/Off
VIOC Pin Controls Buck Converter to Maintain Low Power Dissipation and Optimize Efficiency
PWRGD/UVLO Flag
Current Limit with Foldback & Thermal Shutdown with Hysteresis Protection
Low Profile (0.75mm) Thermally Enhanced 28-Lead 4mm x 5mm QFN Package
 

UltraFast, Digitally Programmable Ultralow Dropout, Low Noise 5A LDO

LT3070

LT3070

Click Photos for High-Res Images

About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, µModule® products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems.

LT, LTC, LTM, µModule and are registered trademarks and UltraFast is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.


Worldwide Contacts

North America and General Information
John Hamburger
Tel: (408) 432-1900 ext. 2419
jhamburger@linear.com

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

China (PRC)
Fanny Lau
Tel: 852-2428-0303
flau@linear.com

Angela Ao
Tel: (8610)6522 8081
angela.ao@ebacomms.com
Japan
Kazuto Takahashi
Tel: 81-3-5226-7291
ktakahashi@linear.com

Hitoshi Kasai
Tel: +0422-47-5319
kasai@miacis.com

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


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

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

UK & Nordic
Alan Timmins
Tel: +44-1252-629937
alan@ezwire.com

Korea

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


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



This message was distributed by

rss   Bookmark and Share