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EVAL-LT8643SA-AZ Evaluation Board for LT8643SA Synchronous Step-Down Silent Switcher

User guide for the EVAL-LT8643SA-AZ demo board featuring the LT8643SA 42V, 6A Silent Switcher 2. Supports 5.8V to 42V input and 5V output with low EMI and high efficiency.

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Overview

The EVAL-LT8643SA-AZ is a demonstration circuit for the LT8643SA, a 42V, 6A micropower synchronous step-down Silent Switcher 2. The board is designed to provide a 5V output from an input range of 5.8V to 42V, making it suitable for automotive and industrial applications. It features integrated bypass capacitors to minimize EMI and includes spread spectrum frequency modulation for further emission reduction. The document provides technical specifications, a quick start procedure, efficiency and thermal performance curves, a complete schematic, a detailed bill of materials, and PCB layout guides.

Use Cases

  • Automotive battery-powered systems
  • Industrial power supplies
  • Low-EMI power conversion
  • High-efficiency step-down regulation
  • High frequency DC-DC conversion

Topics

LT8643SA
EVAL-LT8643SA-AZ
Analog Devices
Silent Switcher 2
synchronous step-down regulator
EMI
spread spectrum
DC-DC converter
automotive power
industrial power supply

Referenced Parts

XEL6030-152MEB

Coilcraft

IND POWER SHIELDED WIREWOUND 1.5μH, 20%, 1MHZ, 14A, 0.01052Ω, DCR HIGH CURRENT, AEC-Q200 XEL6030-152MEB

C0603C331J5GACTU

Kemet

CAP., CER 330pF, 50V, 5%, C0G, 0603, EXTREME LOW ESR C0603C331J5GACTU

575-4

Keystone Electronics

CONN-PCB, BANANA JACK, FEMALE, NON-INSULATED, THT, SWAGE, 0.218 INCHES LENGTH 575-4

8833

Keystone Electronics

STANDOFF, BRD SPT SNAP FIT 12.7MM LENGTH 8833

2501-2-00-80-00-00-07-0

Mill-Max

CONN-PCB SOLDER TERMINAL TEST POINT TURRET 0.094" MTG. HOLE PCB 0.062 INCH THK 2501-2-00-80-00-00-07-0

EEEFN1J220XP

Panasonic

CAP., ALUM ELECT, 22μF, 63V, 20%, 6.3x7.7MM, AEC-Q200, 1.2Ω, 120MA 2000H EEEFN1J220XP

ERJ-3EKF1003V

Panasonic

RES SMD, 100KΩ, 1%, 1/10W, 0603 AEC-Q200 ERJ-3EKF1003V

ERJ-3EKF1004V

Panasonic

RES SMD 1MΩ, 1%, 1/10W, 0603 AEC-Q200 ERJ-3EKF1004V

ERJ-3EKF1782V

Panasonic

RES SMD 17.8KΩ, 1%, 1/10W, 0603 AEC-Q200 ERJ-3EKF1782V

ERJ-3EKF49R9V

Panasonic

RES SMD 49.9Ω, 1%, 1/10W, 0603 AEC-Q200 ERJ-3EKF49R9V

ERJ-3EKF8451V

Panasonic

RES SMD 8.45KΩ, 1%, 1/10W, 0603 AEC-Q200 ERJ-3EKF8451V

ERJ-3GEY0R00V

Panasonic

RES SMD 0Ω, JUMPER 1/10W, 0603 AEC-Q200 ERJ-3GEY0R00V

60800213421

Wurth Electronics

SHUNT FEMALE 2POS 2MM 60800213421

62000821121

Wurth Electronics

CONN-PCB 8POS MALE HDR UNSHROUDED DUAL ROW ST, 2MM PITCH, 2.80MM, SOLDER TAIL 62000821121

74279226101

Wurth Electronics

IND FERRITE BEAD MULTI LAYER 100Ω AT 100MHZ, 25%, 8A 0.006Ω 1812 AEC-Q200 74279226101

112404

Amphenol RF

CONN-PCB BNC JACK ST 50Ω 112404

0603YC104KAT2A

KYOCERA AVX

CAP., CER 0.1μF, 16V, 10%, X7R 0603 0603YC104KAT2A

12105G106ZAT2A

KYOCERA AVX

CAP., CER 10μF, 50V, -20% TO +80% Y5V, 1210 12105G106ZAT2A

EVAL-LT8643SA-AZ Evaluation Board for LT8643SA Synchronous Step-Down Silent Switcher | Design Resources