600mA Negative LDO+ Offers Rail-to-Rail Operation, Programmable Current Limit & Output Current Monitor

News Release  www.linear.com
600mA Negative LDO+ Offers Rail-to-Rail Operation,
Programmable Current Limit & Output Current Monitor
MILPITAS, CA – September 26, 2013 – Linear Technology Corporation announces the LT3090,
the newest member of our LDO+™ family, a 600mA low dropout negative linear regulator
featuring low noise, rail-to-rail operation, precision programmable current limit and a
bidirectional output current monitor. The device is cable-drop compensation capable, easily
parallelable for higher current or PCB heat spreading and configurable as a floating 3-terminal
regulator. The LT3090’s input voltage range is -1.5V to -36V. A single resistor programs the
adjustable rail-to-rail output voltage from 0V to -32V and dropout voltage is only 300mV
(typical at full load). The device features a trimmed, ±1% accurate 50µA current source reference
and provides ±2% output voltage tolerance over line, load and temperature. Output voltage
regulation, bandwidth, transient response and output noise (18µVrms over a 10Hz to 100kHz
bandwidth) remain independent of output voltage due to the device’s unity-gain voltage follower
architecture. The LT3090 is ideal for negative logic supplies, low noise instrumentation and RF
supplies, rugged industrial supplies and for post-regulating switching supplies.
The LT3090 exhibits excellent stability with a wide range of output capacitors including
small, low cost ceramic capacitors. It is stable with a minimum 4.7µF output capacitor. A single
resistor adjusts the precision programmable current limit. The device’s bipolar current monitor
either sources or sinks a current proportional to output current, useful for system monitoring. The
LT3090’s bidirectional shutdown capability allows the device to operate with either positive or
600mA Negative LDO+ Offers Rail-to-Rail Operation,
Programmable Current Limit & Output Current Monitor
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negative logic levels. In addition, the LT3090’s accurate shutdown thresholds enable a
programmable UVLO threshold for either the regulator’s input supply or a positive system
supply voltage. Internal protection circuitry for the IC includes a precision current limit with
foldback and thermal shutdown with hysteresis. In bipolar supply applications where the
regulator’s load returns to a positive supply, the OUT pin can be pulled above GND up to 40V
and will still allow the LT3090 to safely start up.
The LT3090 is available in a low profile (0.75mm) 3mm x 3mm 10-lead DFN and a 12lead MSOP package, both with backside thermal pads. E- and I-grade operating junction
temperature is -40°C to +125°C, H-grade is -40°C to +150°C, and the MP-grade is specified over
the widest operating range from -55°C to +150°C. 1000-piece pricing for the E-grade version
starts at $2.15 each, and devices are available from stock. For more information, visit
Photo Caption: 600mA Negative LDO
Summary of Features: LT3090
Output Current: 600mA
Single Resistor Sets Output Voltage
50μA SET Pin Current: ±1% Initial Accuracy
Programmable “Brick-Wall” Current Limit
Dual Polarity Output Current Monitor
Parallelable for Higher Current and Heat Spreading
Low Dropout Voltage: 300mV
Low Output Noise: 18μVRMS (10Hz to 100kHz)
Configurable as a 3-Terminal Floating Regulator
Wide Input Voltage Range: –1.5V to –36V
Rail-to-Rail Output Voltage Range: 0V to –32V
Positive/Negative Shutdown Logic or UVLO
Internal Back-Up Current Limit with Foldback
Stable with 4.7μF Minimum Output Capacitor
Stable with Ceramic or Tantalum Capacitors
Reverse Output Protection
Thermally Enhanced 12-Lead MSOP and 10-Lead
600mA Negative LDO+ Offers Rail-to-Rail Operation,
Programmable Current Limit & Output Current Monitor
page 3
3mm × 3mm x 0.75mm DFN Packages
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 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.
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North America / Worldwide
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John Hamburger, Director Marketing
Tel: 408-432-1900 ext 2419
Alan Timmins
Tel: +44-1-252-629937
Doug Dickinson, Media Relations Manager
Tel: 408-432-1900 ext 2233