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LT3045 Datasheet(PDF) 1 Page - Analog Devices |
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LT3045 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 45 page  Data Sheet LT83201 18V, 1A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference Rev. A DOCUMENT FEEDBACK One Analog Wa y, Wilmington, MA 01887 - 2356, U.S.A. T el: 781.329.4700 TECHNICAL SUPPORT © 202 5 Analog Devices, Inc. All rights reserved. FEATURES Silent Switcher® 3 Architecture Ultra-Low RMS Noise (10Hz to 100kHz): 4μVRMS Ultra-Low Spot Noise: 4nV/√Hz at 10kHz Ultra-Low EMI Emissions Ultra-Fast Transient Response <1µs Transient Recovery Time High Efficiency at High Frequency Up to 94% Efficiency at 2MHz, 12VIN to 5VOUT Up to 92% Efficiency at 4MHz, 12VIN to 5VOUT Input Voltage Range: 2.8V to 18V Output Voltage Range: 0V to (VIN − 0.5V) Unity Gain Configuration up to 13V Output Maximum Continuous Output Current: 1A Fast Minimum Switch On-Time: 13ns Adjustable and Synchronizable: 300kHz to 6MHz Precision Reference: ±0.6% Over Temperature with Remote Sense Pin Selectable Forced Continuous Mode (FCM) or Discontinuous Conduction Mode (DCM) During Operation Full Frequency Discontinuous Conduction at Light Loads in DCM for Higher Efficiency and Predictable Noise Supports Dynamic Output Voltage Control Programmable Power Good Tiny 15-Lead 3mm × 2mm LFCSP Package Pin-to-Pin Compatible Family: LT83201 (1A), LT83203 (3A), LT83205 (5A) GENERAL DESCRIPTION The LT®83201 synchronous step-down regulator is uniquely designed to combine an ultra-low noise reference with Silent Switcher architecture to achieve both high efficiency and excellent wideband noise performance. The innovative ultra-low noise architecture allows exceptional low-frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, resulting in virtually constant output noise independent of output voltage. Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies. The LT83201 is ideal for noise-sensitive applications which benefit from the high efficiency of a synchronous switching regulator. APPLICATIONS RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs Low Noise Instrumentation High Speed/High Precision ADCs/DACs General Purpose Power Supply All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 882334. TYPICAL APPLICATION Figure 1. LT83201 Application Diagram Figure 2. 12V to 3.3V Efficiency 4.7µF 47.5kΩ 1µF 33.2kΩ 1.47kΩ 280kΩ 49.9kΩ 0.1µF 1µF 4.7nF 1µF 1µF 2.2µH 32µF VIN EN/UVLO SET RT GND VC PGFB OUTS SW LT83201 fSW = 2MHz BST INTVCC VIN GND GND VIN 3.9V TO 18V 3.3V 1A VOUT PG EFFICIENCY POWER LOSS 2MHz, DCM 2MHz, FCM LOAD CURRENT (A) 0 0.2 0.4 0.6 0.8 1.0 45 50 55 60 65 70 75 80 85 90 95 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 |
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