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LTC7151S Datasheet(PDF) 1 Page - Analog Devices |
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LTC7151S Datasheet(HTML) 1 Page - Analog Devices |
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1 / 44 page  Data Sheet LT83203/LT83205 18V, 3A/5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference Rev. B DOCUMENT FEEDBACK TECHNICAL SUPPORT One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A. Tel: 781.329.47 00 ©2024 Analog Devices, Inc. Al l rights rese rve d. 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 93% Efficiency at 2MHz, 12VIN to 3.3VOUT Up to 90% Efficiency at 4MHz, 12VIN to 3.3VOUT 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 LT83203: 3A LT83205: 5A Fast Minimum Switch On-Time: 15ns Adjustable and Synchronizable: 300kHz to 6MHz Precision Reference: ±0.7% Over Temperature with Remote Sense Supports Dynamic Output Voltage Control Pin Selectable Forced Continuous Mode or Pulse-Skipping Mode 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®83203/LT®83205 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 provides 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 LT83203/LT83205 is ideal for high-current, noise- sensitive applications that benefit from the high efficiency of a synchronous switching regulator. APPLICATIONS RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs High Speed/High Precision ADCs/DACs Low Noise Instrumentation 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. LT83203/LT83205 Application Diagram Figure 2. 12V to 1V Efficiency 10µF 47.5kΩ 2.2µF 10kΩ 499Ω 49.9kΩ 49.9kΩ 0.1µF 1µF 10nF 82pF 0.22µF 0.22µF 0.47µH 54µF VIN EN/UVLO SET RT GND VC PGFB OUTS SW LT83205 fSW = 2MHz BST INTVCC VIN GND GND VIN 2.8V TO 18V 1V 5A VOUT PG EFFICIENCY POWER LOSS 1MHz 2MHz 3MHz LOAD CURRENT (A) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 5.6 6.0 6.4 |
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