LT3099
LT3099
RECOMMENDED FOR NEW DESIGNS-20V, 1A, Ultralow Noise, Ultrahigh PSRR Negative Linear Regulator
- Part Models
- 2
- 1ku List Price
- Starting From $4.55
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Overview
- Ultralow RMS Noise: 1.4μVRMS (10Hz to 100kHz)
- Ultralow Spot Noise: 4nV/√Hz at 10kHz
- Ultrahigh PSRR: 75dB at 1MHz
- Output Current: 1A
- Wide Input Voltage Range: -3.5V to -20V
- Single Capacitor Improves Noise and PSRR
- 100μA SET Pin Current: ±0.5% Initial Accuracy
- Single Resistor Programs Output Voltage
- Programmable Current Limit
- Low Dropout Voltage: 350mV
- Output Voltage Range: 0V to -19V
- Programmable Power Good and Fast Start-Up
- Bi-directional Precision Enable/UVLO
- VIOC pin to manage power dissipation
- Parallelable for Lower Noise and Higher Current
- Internal Current Limit with Foldback
- Minimum Output Capacitor: 10μF Ceramic
- Compact, 14-lead, 4mm x 3mm DFN package
The LT3099 is a high-performance, low-dropout negative linear regulator featuring Analog Devices, Inc.’s ultralow noise and ultrahigh power-supply rejection ratio (PSRR) architecture for powering noisesensitive applications. Designed as a precision current reference followed by a high-performance voltage buffer, the LT3099 can be easily paralleled to reduce noise further, increase output current, and spread heat on the PCB.
The device supplies 1A at a typical 350mV dropout voltage. The operating quiescent current is nominally 2.9mA and drops to 5μA in shutdown. The LT3099’s wide output voltage range (0V to -19V) error amplifier operates at unity gain and provides virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additionally, the regulator features a bi-directional enable pin, programmable current limit, fast start-up capability, and programmable power good for indicating output voltage regulation. The regulator incorporates a tracking function to control an upstream supply to maintain a constant voltage across the LT3099 and minimize power dissipation.
Built-in protection includes an internal current limit with foldback and a thermal limit with hysteresis. The LT3099 is available in a thermally enhanced 4mm × 3mm DFN package.
APPLICATIONS
- RF Power Supplies and Precision Power Supplies
- Very Low Noise Instrumentation
- High-speed/High-precision Data Converters
- Medical Applications: Diagnostics and Imaging
- Post-regulator for Switching Supplies
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LT3099ADE#PBF | 14-Lead DFN (4mm x 3mm w/ EP) | ||
| LT3099ADE#TRPBF | 14-Lead DFN (4mm x 3mm w/ EP) |
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LT3099
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
Evaluates: LT3099