45V 100mA LDO Offers 30µVRMS Noise, Programmable Current Limit & Diagnostic Information

News Release ⎜ www.linear.com
45V 100mA LDO Offers 30µVRMS Noise,
Programmable Current Limit & Diagnostic Information
MILPITAS, CA – September 14, 2009 – Linear Technology Corporation announces the LT3050,
a high voltage, low noise, low dropout voltage linear regulator offering precision, programmable
current limit and diagnostic capability. The device delivers up to 100mA output current with a
340mV dropout voltage at full load. The LT3050 features a wide 2V to 45V input voltage range,
delivering adjustable output voltages from 0.6V to 44.5V. A single capacitor at the REF/BYP pin
provides programmable low noise operation--only 30µVRMS across a wide bandwidth of 10Hz to
100kHz--and reference soft start functionality, preventing output voltage overshoot at turn-on.
Output voltage tolerance is highly accurate at ±2% over line, load and temperature.
The LT3050 provides several diagnostic and safety functions. A single resistor at the
IMAX pin programs current limit, accurate to ±5% over the full input voltage and temperature
range. Also, a single resistor at the IMIN pin programs a minimum output current detector, useful
for identifying open-circuit conditions. Furthermore, a current monitor function sources current
equal to 1/100th of output current, allowing the user to measure output current or calculate the
device’s power dissipation. A logic Fault pin asserts low if the LT3050 is in current limit,
operating below its minimum output current (open-circuit) or is in thermal shutdown. Moreover,
the LT3050’s internal protection circuitry includes reverse-battery protection, reverse-output
protection, reverse-current protection, internal default current limiting and thermal limiting.
The LT3050 operates with a very small, low cost, 2.2µF ceramic output capacitor,
optimizing stability and transient response. This tiny external capacitor can be used without the
45V 100mA LDO Offers 30uVRMS Noise,
Programmable Current Limit & Diagnostic Information
page 2
addition of series resistance (ESR) as is common with many other regulators. The LT3050’s
wide input and output voltage ranges, fast transient response, low quiescent current of 50µA
(operating) and <1µA (in shutdown) make it an excellent choice for active antenna supplies,
industrial power supplies, battery-powered systems requiring optimum run time, and high
reliability power supplies requiring diagnostic information and protection functions.
The LT3050EDDB & LT3050IDDB are housed in the 12-lead 2mm x 3mm DFN
package, while the LT3050EMS8E & LT3050IMS8E are available in the 12-lead thermally
enhanced MSOP package, all offering a compact footprint. Both “E” and “I” grade versions are
available from stock with an operating junction temperature of -40°C to +125°C, while the “MP”
grade operates from -55 to +125°C (MSOP package only, LT3050MPMS8E) . 1,000 piece
pricing starts at $1.55 & $1.75 each for the DFN package E and I grades, respectively, and $1.55,
$1.75 and $4.19 each for the MSOP package E, I and MP grades, respectively. For more
information, visit www.linear.com.
Photo Caption: 45VIN, 0.6VOUT 100mA Ultralow Noise LDO with Diagnostics
Summary of Features: LT3050
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Output Current: 100mA
Dropout Voltage: 340mV
Input Voltage Range: 2V to 45V
Programmable Precision Current Limit: ±5%
Programmable Minimum IOUT Detector
Output Current Monitor: 1/100th of IOUT
Fault Indicator: Current Limit, Minimum IOUT or Thermal Limit
Low Noise: 30µVRMS (10Hz to 100kHz)
Adjustable Output (VREF = VOUT(MIN) = 0.6V)
Reference Soft Start Capability Prevents Output Voltage Turn-on Overshoot
Output Tolerance: ±2% Over Line, Load and Temperature
Stable with Low ESR, Ceramic Output Capacitors (2.2µF minimum)
Shutdown Current: <1µA
Reverse Battery and Reverse Current Protection
Thermal Limit Protection
45V 100mA LDO Offers 30uVRMS Noise,
Programmable Current Limit & Diagnostic Information
page 3
• 12-Lead 2mm × 3mm DFN & MSOP Packages
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 of Linear Technology Corp. All other trademarks are the
property of their respective owners.
Press Contacts:
North America / Worldwide
UK & Nordic
John Hamburger, Director Marketing
Communications
[email protected]
Tel: 408-432-1900 ext 2419
Alan Timmins
[email protected]
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
[email protected]
Tel: 408-432-1900 ext 2233
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