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RT6206BHGQW 5.5A, 18V, 650kHz, ACOT™ Synchronous Step-Down Converter

EVB_RT6206BHGQW

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The RT6206BH is a synchronous step-down DC/DC converter with Advanced Constant On-Time (ACOT™) mode control. It achieves high power density to deliver up to 5.5A output current from a 4.5V to 18V input supply. The proprietary ACOT™ mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitor for ensuring performance stabilization. In addition, RT6206BH keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOT™ mode operation provides high efficiency in whole output current load range. Cycle-by-cycle current limit provides an accurate protection by a valley detection of low side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown for RT6206BH.

Purpose

The RT6206BH is a synchronous step-down DC/DC converter with Advanced Constant On-Time (ACOT™) mode control. This document explains the function and use of the RT6206BH evaluation board (EVB), and provides information to enable operation, modification of the evaluation board and circuit to suit individual requirements.


Introduction

General Product Information

The RT6206BH is a synchronous step-down DC/DC converter with Advanced Constant On-Time (ACOT™) mode control. It achieves high power density to deliver up to 5.5A output current from a 4.5V to 18V input supply. The proprietary ACOT™ mode offers an optimal transient response over a wide range of loads and all kinds of ceramic capacitors, which allows the device to adopt very low ESR output capacitor for ensuring performance stabilization. In addition, RT6206BH keeps an excellent constant switching frequency under line and load variation and the integrated synchronous power switches with the ACOT™ mode operation provides high efficiency in whole output current load range. Cycle-by-cycle current limit provides an accurate protection by a valley detection of low side MOSFET and external soft-start setting eliminates input current surge during startup. Protection functions include thermal shutdown for RT6206BH.


Product Feature

  • ACOT™ Mode Enables Fast Transient Response
  • 4.5V to 18V Input Voltage Range
  • 5.5A Output Current
  • 35mΩ Internal Low Side N-MOSFET
  • Advanced Constant On-Time Control
  • Support All Ceramic Capacitors
  • Up to 95% Efficiency
  • Discontinuous Operating Mode at Light Load
  • Adjustable Output Voltage from 0.765V to 8V
  • Adjustable Soft-Start
  • Cycle-by-Cycle Current Limit
  • Input Under-Voltage Lockout
  • Thermal Shutdown

 

Key Performance Summary Table

Key Features

Evaluation Board Number : PCB066_V1

Input Voltage Range

4.5V to 18V

Max Output Current

5.5A

Default Output Voltage

1.05V

Default Marking & Package Type

RT6206BHGQW, WDFN-10L 3x3

Operation Frequency

650kHz



Bench Test Setup Conditions

Headers Description and Placement

Technical Document Image Preview

Please carefully inspect the EVB IC and external components, comparing them to the following Bill of Materials, to ensure that all components are installed and undamaged. If any components are missing or damaged during transportation, please contact the distributor or send e-mail to evb_service@richtek.com.



Test Points

The EVB is provided with the test points and pin names listed in the table below.

Test point/

Pin name

Signal

Comment (expected waveforms or voltage levels on test points)

VIN

Input voltage

Power input.

EN

Enable test point

Externally pulled high to enable and pulled low to disable this chip. It is internally pulled up to high when the pin is floating.

GND

Ground

The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation.

VREG5

Internal Regulator Output

Internal Regulator Output. Connect a 1μF capacitor to GND to stabilize output voltage.

SS

Soft-Start Control.

Connect an external capacitor between this pin and GND to set the soft-start time.

PG

Power good test point

Output of power good indicator.

BOOT

Bootstrap supply test point

Bootstrap supply for high-side gate driver. Connect a capacitor between the BOOT and SW pins.

SW

Switch node test point

Connect this pin to an external L-C filter.



Power-up & Measurement Procedure

1. Apply a 12V nominal input power supply (4.5 < VIN < 18V) to the VIN and GND terminals.

2. Set the jumper at JP1to connect terminals 2 and 3, connecting EN to enable operation.

3. Verify the output voltage (approximately 1.05V) between VOUT and GND.

4. Connect an external load up to 5.5A to the VOUT and GND terminals and verify the output voltage and current.


Output Voltage Setting

Set the output voltage with the resistive divider (R2, R3) between VOUT and GND with the midpoint connected to FB. The output is set by the following formula :

VOUTTechnical Document Image Preview



Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

Technical Document Image Preview



Bill of Materials

Reference

Qty

Part Number

Description

Package

Manufacture

U1

1

RT6206BHGQW

DC/DC Converter

WDFN-10L 3x3

RICHTEK

C1, C3

2

GRM31CR71E106KA12L

10µF/25V/X7R

C-1206

MURATA

C4, C10, C7

3

C1608X7R1H104KT000N

0.1µF/50V/X7R

C-0603

TDK

C8, C9

2

GRM31CR61A226KE19L

22µF/10V/X5R

C-1206

MURATA

C6

1

0603B332K500

3.3nF/50V/X7R

C-0603

WALSIN

C5

1

C2012X7R1E105KT

1µF/25V/X7R

C-0805

TDK

C2

1

NC

L1

1

NR8040T1R4N

1.4µH/7A

8 x 8 x 4 mm

TAIYO YUDEN

R2

1

8.25k

R-0603

R3

1

22.1k

R-0603

R1, R4

2

100k

R-0603



PCB Layout

Technical Document Image Preview

Top View (1st layer)

Technical Document Image Preview

PCB Layout—Inner Side (2nd Layer)

Technical Document Image Preview

PCB Layout—Inner Side (3rd Layer)

Technical Document Image Preview

Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2016/04/08
Bill of Materials 2016/04/08
Gerber File 2016/04/08
Schematic 2016/04/08
RT6206B

5.5A, 18V, 650kHz ACOT® 同步降壓型轉換器

RT6206B

RT6206B是一款ACOT(Advanced Constant On-Time)操作模式的同步降壓型DC/DC轉換器,輸入電壓4.5V至18V範圍內,最大電流輸出為5.5A。系統操作於ACOT模式下可在廣負載變動範圍內提供良好的暫態回應,並於輸出電容的選擇上可選用具較小ESR的陶瓷電容,並確保整體系統表現的穩定性。此外,RT6206B在輸入與負載變動情形下仍能提供良好的固定操作頻率表現,內建的整流開關可允許在輸出在全負載變動範圍內提供良好的轉換效率。藉由偵測同步整流開關的端電壓可達到逐週期形式的限流機制,並可藉由外部的電容設計達到緩啟動效果,消除啟動時產生過大的輸入電湧。在保護機制方面,RT6206B具有過溫保護功能。RT6206B提供SOP-8(散熱焊盤)和WDFN-10L 3x3封裝。

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