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reference designLT83203 | Demoboard EVAL-LT83203-AZ

Analog Devices LT83203 | Demoboard EVAL-LT83203-AZ

18V, 3A/5A Step-Down Silent Switcher 3 with Ultra-Low Noise Reference

Overview

TopologyBuck Converter
Input voltage2.8-18 V
Output 11 V / 3 A

Description

The EVAL-LT83203-AZ and EVAL-LT83205-AZ (abbreviated as EVAL-LT83203/5-AZ) demonstration boards are 18V, 3A, and 5A Silent Switcher® 3 step-down regulators with ultra-low noise, high efficiency, and power density, featuring the LT83203 and LT83205 (abbreviated as LT83203/5), respectively. The input voltage range of the EVAL-LT83203/5-AZ is 2.8V to 18V. The default demo board setting is 1V output with a maximum DC output current of 3A/5A. The LT83203/5 is a compact, ultra-low noise, ultra-low emission, high efficiency, 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 LT83203/5 to achieve excellent wideband noise performance. A minimum on-time of 15ns allows high VIN to low VOUT conversion at high frequency.

Features

Silent Switcher® 3 ArchitectureUltra-Low RMS Noise (10Hz to 100kHz): 4μVRMSUltra-Low Spot Noise: 4nV/√Hz at 10kHzUltra-Low EMI EmissionsUltra-Fast Transient Response<1μs Transient Recovery TimeHigh Efficiency at High FrequencyUp to 93% Efficiency at 2MHz, 12VIN to 3.3VOUTUp to 90% Efficiency at 4MHz, 12VIN to 3.3VOUTInput Voltage Range: 2.8V to 18VOutput Voltage Range: 0V to (VIN − 0.5V)Unity Gain Configuration up to 13V OutputMaximum Continuous Output CurrentLT83205: 5AFast Minimum Switch On-Time: 15nsAdjustable and Synchronizable: 300kHz to 6MHz;Precision Reference: ±0.7% Over Temperature with Remote Sense;Supports Dynamic Output Voltage ControlPin Selectable Forced Continuous Mode or Pulse-Skipping ModeProgrammable Power GoodTiny 15-Lead 3mm × 2mm LFCSP Package;Pin-to-Pin Compatible Family: LT83201 (1A), LT83203 (3A), LT83205 (5A)

Typical applications

  • General Purpose Power Supply, RF Power Supplies: PLLs, VCOs, Mixers, LNAs, PAs

More information

Parts approved by Analog Devices

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Z @ 100 MHz(Ω)
Zmax(Ω)
Test Condition Zmax
IR(mA)
Z @ 1 GHz(Ω)
H(mm)
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74279228600
SPECWE-MPSB EMI Multilayer Power Suppression Bead, 60 Ω, 99 Ω
Simu­lation
Availability
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Downloads10 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-MPSB EMI Multilayer Power Suppression Bead
Impedance @ 100 MHz60 Ω
Maximum Impedance99 Ω
Maximum Impedance458 MHz 
Rated Current5100 mA
Impedance @ 1 GHz74 Ω
Height0.8 mm
TypeHigh Current 
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Additional parts recommended by Würth Elektronik

Recommended parts are Würth Elektronik alternatives that are not formally approved for this reference design. Please verify it is suitable for your application, and contact us if you have any questions.

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L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
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744393240064
SPECWE-XHMI SMT Power Inductor, 0.64 µH, 15.2 A
Simu­lation
Availability
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Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Inductance0.64 µH
Performance Rated Current15.2 A
Saturation Current @ 30%17 A
DC Resistance4.8 mΩ
DC Resistance5.81 mΩ
Self Resonant Frequency90 MHz
MountSMT 
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