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LT8625SP Datasheet(PDF) 1 Page - Analog Devices |
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LT8625SP Datasheet(HTML) 1 Page - Analog Devices |
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1 / 44 page  Data Sheet LT83401/LT83402 42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference Rev. 0 DOCUMENT FEEDBACK TECHNICAL SUPPORT One Analog Wa y, Wilmington, MA 01887 - 2356, U.S.A. T el: 781.329.4700 © 2024 Analog D evic es, Inc. Al l rig hts r eser ved. FEATURES Silent Switcher® 3 Architecture Ultra-Low RMS Noise (10Hz–100kHz): 2.8μVRMS Ultra-Low Spot Noise: 4nV/√Hz at 10kHz Ultra-Low EMI Emissions Ultra-Fast Transient Response Minimizes the Output Capacitance High Efficiency at High Frequency Up to 92.4% Efficiency at 2MHz, 12VIN to 5VOUT Input Voltage Range: 2.8V to 42V Output Voltage Range: 0V to (VIN - 1V) Unity Gain Configuration Up to 15VOUT Fast Minimum Switch On-Time: 22ns Precision Reference: ±0.8% Over Temperature with Remote Sense Forced Continuous Mode Capability Adjustable and Synchronizable: 300kHz to 6MHz Programmable Power Good Tiny, 15-Lead 3mm x 2mm LFCSP Package Pin-to-Pin Compatible Family: LT83201 (18V, 1A), LT83203 (18V, 3A), and LT83205 (18V, 5A) AEC-Q100 Qualification in Progress GENERAL DESCRIPTION The LT®83401/LT®83402 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 Electro- magnetic interference (EMI) emissions while delive- ring high efficiency at high switching frequencies. The LT83401/LT83402 is ideal for high-current, noise- sensitive applications that benefit from the high efficiency of a synchronous switching regulator. APPLICATIONS Automotive and Industrial Power Supplies Medical Applications: Imaging and Diagnostics High-Speed and High-Precision Data Converters Bipolar, Very Low-Noise Power Supplies Low-Noise Instrumentation and Displays TYPICAL APPLICATION Figure 1. Simplified Application Diagram Figure 2. 12V to 3.3V Efficiency 10µF 47.5kΩ 1µF 33.2kΩ 720Ω 280kΩ 49.9kΩ 0.1µF 1µF 10nF 82pF 1µF 1µF 2.2µH 22µF VIN EN/UVLO SET RT GND VC PGFB OUTS SW LT83402 fSW = 2MHz BST INTVCC VIN GND GND 3.3V 2.5A VOUT PG VIN 4.8V to 42V EFFICIENCY POWER LOSS L = XGL6060 1MHz, 4.7µH, (9.1mΩ) 2MHz, 2.2µH, (4.3mΩ) 3MHz, 1µH, (2.5mΩ) LOAD CURRENT (A) 0 0.5 1.0 1.5 2.0 2.5 70 75 80 85 90 95 0 0.5 1.0 1.5 2.0 2.5 |
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