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推荐新设计使用
说明
- Ultra-Low RMS Noise: 0.8μVRMS (10Hz to 100kHz)
- Ultra-Low Noise: 2.2nV/√Hz at 10kHz
- Ultra-Low 1/f Noise: 2.5μVP-P (0.1Hz to 10Hz)
- Ultra-High PSRR: 82dB at 1MHz
- Output Current: 200mA
- Wide Input-Voltage Range: 2.2V to 20V
- Single Capacitor Improves Noise and PSRR
- SET Pin Current: 100μA, ±0.5% Initial Accuracy
- Single Resistor Programs Output Voltage
- Programmable Current Limit
- Low Dropout Voltage: 300mV
- Output-Voltage Range: 0.2V to 19V
- 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: 4.7μF Ceramic
- Compact, Low-Profile, 12-Lead, 3mm × 3mm, DFN Package
特性
The LT3046 is a high-performance, low-dropout linearregulator featuring Analog Devices, Inc. ultra-low noiseand ultra-high PSRR architecture for powering noisesensitiveapplications. Designed as a precision currentreference followed by a high-performance voltagebuffer, the LT3046 can be easily paralleled to furtherreduce noise, increase output current, and spread heaton the PCB.
The device supplies 200mA at a typical 300mV dropoutvoltage. Operating quiescent current is nominally3.7mA and drops to 26μA in shutdown. The LT3046’swide output-voltage range (0.2V to 19V) whilemaintaining unity-gain operation provides virtuallyconstant output noise, PSRR, bandwidth, and loadregulation, independent of the programmed outputvoltage. Additionally, the regulator featuresprogrammable current limit, fast start-up capability,and programmable power good to indicate outputvoltage regulation.
Built-in protection includes reverse-battery protection,reverse-current protection, internal current limit withfoldback and thermal limit with hysteresis. The LT3046is available in a thermally enhanced, 12-lead, 3mm ×3mm, DFN package.
APPLICATIONS
- RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs
- Very Low-Noise Instrumentation
- High-Speed/High-Precision Data Converters
- Post-Regulator for Switching Supplies
