45V 500mA LDO Offers 25µVRMS Noise, Programmable Current Limit & Diagnostic Information

News Release ⎜ www.linear.com
45V 500mA LDO Offers 25µVRMS Noise,
Programmable Current Limit & Diagnostic Information
MILPITAS, CA – June 3, 2013 – Linear Technology Corporation announces the LT3055, a high
voltage, low noise, low dropout voltage linear regulator offering precision, programmable
current limit and diagnostic capability. The device delivers up to 500mA output current with a
350mV dropout voltage at full load. The LT3055 features a wide 2V to 45V input voltage range,
delivering adjustable output voltages from 0.6V to 40V. A single capacitor at the REF/BYP pin
provides programmable low noise operation--only 25µVRMS across a wide bandwidth of 10Hz to
100kHz, and also reference soft start functionality, preventing output voltage overshoot at turnon. Output voltage tolerance is highly accurate at ±2% over line, load and temperature.
The LT3055 provides several diagnostic and safety functions. A resistor at the IMAX pin
programs current limit, accurate to ±10% over the full temperature range. Also, a 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 1/500th of output
current, allowing the user to measure output current or calculate the device’s power dissipation.
Logic fault pins assert low if the LT3055 is in current limit (FAULT2), is operating below its
minimum output current (FAULT1) or is in thermal limit (both FAULT1 and FAULT2).
PWRGD indicates output regulation. The TEMP pin indicates die temperature. Moreover, the
LT3055’s internal protection circuitry includes reverse-battery protection, reverse-output
protection, reverse-current protection, internal default current limiting and thermal limiting.
The LT3055 operates with a very small, low cost, 3.3µF ceramic output capacitor,
optimizing stability and transient response. This tiny external capacitor can be used without the
addition of series resistance (ESR) as is common with many other regulators. The LT3055’s
wide input and output voltage ranges, fast transient response, low quiescent current of 65µA
(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.
45V 500mA LDO Offers 25µVRMS Noise,
Programmable Current Limit & Diagnostic Information
page 2
The LT3055 is available in thermally enhanced 16-lead 3mm x 4mm DFN and 16-lead
MSOP packages, both with a compact footprint. The E- and I-grade versions feature an operating
junction temperature of -40°C to +125°C, MP-grade operates from -55 to +150°C (MSOP
package only), and the H grade operates from -40°C to +150°C (MSOP package only). Devices
are in stock, and 1,000 piece pricing starts at $2.20 each for the E grade. For more information,
visit www.linear.com/product/LT3055
Photo Caption: 45VIN, 0.6VOUT 500mA Ultralow Noise LDO with Diagnostics
Summary of Features: LT3055
Output Current: 500mA
Dropout Voltage: 350mV
Input Voltage Range: 2V to 45V
Programmable Precision Current Limit: ±10%
Programmable Minimum IOUT Detector
Output Current Monitor: 1/500th of IOUT
Fault Indicator: Current Limit, Minimum IOUT or Thermal Limit
Low Noise: 25µVRMS (10Hz to 100kHz)
Adjustable Output: 0.6V to 40V
Reference Soft Start Capability Prevents Output Voltage Turn-on Overshoot
Output Tolerance: ±2% Over Line, Load & Temperature
Stable with Low ESR, Ceramic Output Capacitors (3.3µF minimum)
Shutdown Current: <1µA
Reverse Battery & Reverse Current Protection
Thermal Limit Protection
16-Lead 3mm × 4mm DFN & MSOP Packages
45V 500mA LDO Offers 25µVRMS Noise,
Programmable Current Limit & Diagnostic Information
page 3
About Linear Technology
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 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
, LT, LTC, LTM, Linear Technology, the Linear logo and µModule and are registered trademarks of Linear
Technology Corp. All other trademarks are the property of their respective owners.
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