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IC manufacturers Diodes Incorporated

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reference designAP64203/303Q | Demoboard DDB103R3

Diodes Incorporated AP64203/303Q | Demoboard DDB103R3

3.8V to 40V Input Automotive Grade, 2A Low IQ Synchronous Buck Converter

Overview

TopologyBuck Converter
Input voltage3.8-40 V
Switching frequency300-2500 kHz
IC revision1

Description

The DDB103R3 Demo Board showcases the AP66x00Q/AP64x03Q 3A DC-DC buck converter, the AP74700Q ideal diode controller, and an EMI input filter. It demonstrates a system-level solution with reverse voltage protection, ISO 7637-2 transient pulse protection (using a suitable TVS), EMI filtering that passes CISPR 25 Class 5, and the DC-DC buck converter. The input filter (as shown in figure 3 within the red square) contains a common mode choke with capacitors on either side in a Pi configuration. This is connected in series with an LC low pass filter containing an inductor and a capacitor. This combination makes the board CISPR 25 class 5 compliant. The AP66x00Q/AP64x03Q (highlighted in yellow) are adjustable switching frequency, internally compensated, synchronous DC-DC buck converter families. The AP66x00Q family has a VIN range of 3.8V-60V, and the AP64x03Q family has a VIN of 3.8V-40V. The AP66x00Q/AP64x03Q device families fully integrate a high-side power MOSFET and low-side power MOSFET to provide high-efficiency step-down DC-DC conversion. The AP66x00Q/AP64x03Q enables continuous load currents of up to 2A/3A, with efficiency as high as 95%. It features current mode control operation, which enables easy loop stabilization supporting a wide range of capacitive loads. The AP66x00Q/AP64x03Q simplifies board layout with its high level of integration and minimal external components. The AP66x00Q/AP64x03Q is available in the U-QFN4040-16/SWP package.

Features

Qualified for Automotive ApplicationsAEC-Q100 Qualified with the Following ResultsDevice Temperature Grade 1: -40°C to +125°C TA▪ Device HBM ESD Classification Level H1C▪ Device CDM ESD Classification Level C3BVIN 8V to 40V2A Continuous Output CurrentVOUT Adjustable from 0.8V to 36VEnhanced Efficiency Mode with BiasAdjustable Switching Frequency. 500kHz Default FrequencyStartup with Pre-Biased OutputExternal Soft-Start with Tracking – Sequential, Ratiometric, or Absolute. Default Internal Soft-Start of 1.7msEnable Pin with 5% ToleranceSoft Discharge±5% Power Good Detection with Internal Pullup ResistorOvercurrent Protection (OCP) with HiccupThermal ProtectionTotally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)Halogen and Antimony Free. “Green” Device (Note 3)The AP64203Q is suitable for automotive applications requiring specific change control; this part is AEC-Q100 qualified, PPAP capable, and manufactured in IATF 16949 certified facilities. https://www.diodes.com/quality/product-definitions/

Typical applications

More information

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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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
L(µH)
IRP,40K(A)
ISAT,30%(A)
RDC typ.(mΩ)
RDC max.(mΩ)
fres(MHz)
Mount
ISAT,10%(A)
SamplesAvailability & Sample
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744393305068
SPECWE-XHMI SMT Power Inductor, 6.8 µH, 6.6 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-XHMI SMT Power Inductor
Inductance6.8 µH
Performance Rated Current6.6 A
Saturation Current @ 30%6.9 A
DC Resistance23.7 mΩ
DC Resistance29.28 mΩ
Self Resonant Frequency18 MHz
MountSMT 
Saturation Current @ 10%3.4 A
–Check availability
7843845030068
SPECWE-MXGA SMT Power Inductor, 6.8 µH, 6.5 A
Simu­lation
Availability
–
Downloads9 files

Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-MXGA SMT Power Inductor
Inductance6.8 µH
Performance Rated Current6.5 A
Saturation Current @ 30%6.8 A
DC Resistance28.3 mΩ
DC Resistance31.7 mΩ
Self Resonant Frequency18 MHz
MountSMT 
Saturation Current @ 10%3.2 A
–Check availability