. UItralow RMS Noise:0.8pVRMS (10Hz to 100kHz)
■UItralow Spot Noise:2nV//Hz at 10kHz
■UItrahigh PSRR:76dB at 1MHz
■Output Current:500mA Wide Input Voltage Range:1.8V to 20V aSingle Capacitor Improves Noise and PSRR
■100WA SET Pin Current:±1% lnitial Accuracy Single Resistor Programs Output Voltage
■High Bandwidth:1MHz
■Programmable Current Limit Low Dropout Voltage:260mV
■Output Voltage Range:0V to 15V
■Programmable Power Good
■Fast Start-Up Capability
■Precision Enable/UVLO Parallelable for Lower Noise and Higher Current
■Internal Current Limit with Foldback
■Minimum Output Capacitor:10uF Ceramic Reverse-Battery and Reverse-Current Protection 12-Lead MSOP and 10-Lead 3mm × 3mm DFN Packages
APPLICATIOnS
RF Power Supplies: PLLs, VCOs, Mixers, LNAS, PAS
■Very Low Noise Instrumentation■High Speed/High Precision Data Converters
■Medical Applications: Imaging, Diagnostics
■Precision Power Supplies
■Post-Regulator for Switching Supplies
DESCRIPTIOn
The LTe3045 is a high performance low dropout linear regulator featuring LTC's ultralow noise and ultrahigh PSRR architecture for powering noise sensitive applica-tions. Designed as a precision current reference followed by a high performance voltage bufer, the LT3045EDD#PBF can be easily paralleled to further reduce noise, increase output current and spread heat on the PCB.
The device supplies 500mA at a typical 260mV dropout voltage. Operating quiescent current is nominally 2.2mA and drops to <<1uA in shutdown. The LT3045's wide output voltage range(OV to 15V) while maintaining unity-gain operation provides virtually constant output noise, PSRR, bandwidth and load regulation, independent of the programmed output voltage. Additionally, the regulator features programmable current limit, fast start-up capa-bility and programmable power good to indicate output voltage regulation.
The LT3045EDD#PBF is stable withaminimum 10uF ceramic output capacitor. Built-in protection includes reverse-batteryprotection, reverse-current protection, internal current limit with foldback and thermal limit with hysteresis. The LT3045EDD#PBF is available in thermally enhanced 12-Lead MSOP and 10-Lead 3mm ×3mm DFN packages.
Feature
- Ultralow RMS Noise: 0.8µVRMS (10Hz to 100kHz)
- Ultralow Spot Noise: 2nV/√Hz at 10kHz
- Ultrahigh PSRR: 76dB at 1MHz
- Output Current: 500mA
- Wide Input Voltage Range: 1.8V to 20V
- Single Capacitor Improves Noise and PSRR
- 100µA SET Pin Current: ±1% Initial Accuracy
- Single Resistor Programs Output Voltage
- High Bandwidth: 1MHz
- Programmable Current Limit
- Low Dropout Voltage: 260mV
- Output Voltage Range: 0V to 15V
- Programmable Power Good
- Fast Start-Up Capability
- Precision Enable/UVLO
- Parallelable for Lower Noise and Higher Current
- Internal Current Limit with Foldback
- Minimum Output Capacitor: 10µF Ceramic
- Reverse-Battery and Reverse-Current Protection
- 12-Lead MSOP and 10-Lead 3mm × 3mm DFN Packages
Applications
- RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
- Very Low Noise Instrumentation
- High Speed/High Precision Data Converters
- Medical Applications: Imaging, Diagnostics
- Precision Power Supplies
- Post-Regulator for Switching Supplies
(Picture:Pinout / Diagram)
