Analog Devices Inc. LT3073 Dropout Ultra-Fast Linear Regulators
Analog Devices Inc. LT3073 Dropout Ultra-Fast Linear Regulators are low voltage, ultra-low noise, and ultra-fast transient response linear regulators that supply up to 3A with a typical dropout voltage of 45mV. The device features a 4.7µF reference bypass capacitor that decreases output voltage noise to 1.2µVRMS. The LT3073 is excellent for powering high-performance FPGAs, data converters, RF, and noise-sensitive signal chain applications.
The ADI LT3073 dropout ultra-fast linear regulators provide a digitally selectable output voltage in 50mV increments from 0.5V to 1.2V, 100mV increments from 1.2V to 1.8V, and discrete levels at 2V, 2.5V, 3V, 3.3V, and 4.2V. The unity-gain operation of the device delivers virtually constant output noise, PSRR, bandwidth, and load regulation independent of the programmed output voltage. Additionally, the LT3073 includes a unique tracking feature (VIOC) to control the upstream switching regulator to maintain a constant voltage across the LT3073 and minimize power dissipation.
Built-in protection contains UVLO, internal current limit, and thermal shutdown with hysteresis.
The LT3073 is housed in a compact 22-lead (3mm x 4mm) LQFN package (Laminate package with QFN footprint).
Features
- 1.2μVRMS (10Hz to 100kHz) ultra-low RMS noise
- 3nV/√ at 10kHz ultra-low spot noise
- 7µVP-P from 0.1Hz to 10Hz ultra-low1/f noise
- 52dB at 1MHz high-frequency PSRR
- Ultra-fast transient response
- 45mV typical dropout voltage
- 0.5V to 4.2V digitally programmable VOUT
- ±1.5% over line, load, and temperature output tolerance
- ±3% accuracy at 3A precision current monitor
- ±3% at 3A programmable current limit
- 0.6V to 5.5V input range
- ±2.5% digital output margining
- Stable with ceramic output capacitors (10μF minimum)
- Parallel multiple devices for higher current
- VIOC Pin to control upstream switching converter
- Precision enable/Under Voltage Lock Out (UVLO)
- Power Good (PG) flag
- Temperature monitor
- 22-Lead (3mm x 4mm) LQFN package
Applications
- RF power supplies of PLLs, VCOs, Mixers, LNAs, PAs
- High-speed/high-precision data converters
- Low noise instrumentation
- Post-regulator for switching supplies
- FPGA and DSP power supplies
- Medical applications
Associated Eval Board
Analog Devices Inc. EVAL-LT3073-AZ Evaluation Board
Board is configured to evaluate the LT3073 3A high PSRR ultra-fast linear regulator.
Simplified Application Diagram
Transient Response
Related Regulators
Analog Devices Inc. LT3074 Dropout Linear Regulators
Supported by the LTPowerPlay software development tool with a Graphical User Interface (GUI).