LT83402

RECOMMENDED FOR NEW DESIGNS

42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

Data Sheet (Rev. 0) Product Selection Table
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Overview

  • 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

The LT®83401/LT®83402 synchronous step-down regulator is uniquely designed to combine an ultralow- 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 Electromagnetic interference (EMI) emissions while delivering high efficiency at high switching frequencies.

The LT83401/LT83402 is ideal for high-current, noisesensitive 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
LT83402
42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference
LT83401-LT83402 Typical Application LT83401-LT83402 Efficiency LT83401-LT83402 Pin Configurations LT83402 Chip Illustration
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Documentation

Data Sheet 1

User Guide 1

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Software Resources

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Tools & Simulations

LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:

  • LT83402
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

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EVAL-LT83401-AZ/EVAL-LT83402-AZ

42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

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Product Details

The EVAL-LT83401-AZ and EVAL-LT83402-AZ (abbreviated as EVAL-LT83401/2-AZ) demonstration boards are 42V, 1A, and 2.5A synchronous Silent Switcher® 3 step-down regulators with ultra-low noise, high efficiency, and power density, featuring the LT83401 and LT83402 (abbreviated as LT83401/2), respectively. The input voltage range of the EVAL-LT83401/2-AZ is 4.8V to 42V. The default demo board setting is 3.3V output with a maximum 1A/2.5A DC output current. The LT83401/2 is a compact, ultra-low noise, ultra-low emission, high efficiency, and high-speed synchronous monolithic step-down switching regulator. The uniquely designed combination of the ultra-low noise reference and third-generation Silent Switcher architecture enables the LT83401/2 to achieve both high efficiency and excellent wideband noise performance. A minimum on-time of 22ns allows high VIN to low VOUT conversion at high frequency.

The LT83401/2’s switching frequency can be programmed either through an external resistor (RT) or an external clock over a 300kHz to 6MHz range. The default frequency of EVAL-LT83401/2-AZ demo boards is 2MHz. The SYNC/MODE pin on the demo boards is connected to ground by default for pulse-skip mode operation. To synchronize to an external clock, move JP1 to SYNC and apply the external clock to the SYNC terminal. Select the forced continuous mode (FCM) by moving the JP1 shunt, respectively. Figure 1 and Figure 2 in the User Guide show the efficiency of the EVAL-LT83401/2-AZ at the 12V and 24V inputs in FCM operation (input from VIN terminal). Figure 3 shows the temperature rise of the LT83401 on the EVAL-LT83401-AZ demo board under 12V and 24V input voltage conditions across the full load range. Figure 4 shows the temperature rise of the LT83402 on the EVAL-LT83402-AZ demo board under 12V and 24V input voltage conditions across the full load range. The case temperature rise was measured with the following reference points: The peak IC case temperature and a point on the board, marked with a red ‘X’ as shown in the thermal images Figure 12 and Figure 13 in the User Guide.

Please see the User Guide for the full description.
EVAL-LT83401-AZ/EVAL-LT83402-AZ
42V, 1A/2.5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference
EVAL-LT83401 Board Photo Angle View EVAL-LT83401 Board Photo Top View EVAL-LT83401 Board Photo Bottom View EVAL-LT83402 Board Photo Angle View EVAL-LT83402 Board Photo Top View EVAL-LT83402 Board Photo Bottom View

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