EVB RT6206BHGQW-00 EN

RT6206BHGQW
Evaluation Board
your power partner.
5.5A, 18V, 650kHz, ACOT™ Synchronous Step-Down Converter
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.
Table of Contents
Purpose ................................................................................................................................................................. 1
Introduction............................................................................................................................................................ 2
Key Performance Summary Table .......................................................................................................................... 2
Bench Test Setup Conditions ................................................................................................................................. 3
Schematic, Bill of Materials & Board Layout ........................................................................................................... 5
More Information.................................................................................................................................................... 8
Important Notice for Richtek Evaluation Board ....................................................................................................... 8
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2016
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RT6206BHGQW
Evaluation Board
your power partner.
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
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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
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2016
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RT6206BHGQW
Evaluation Board
your power partner.
Bench Test Setup Conditions
Headers Description and Placement
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
[email protected].
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.
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2016
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RT6206BHGQW
Evaluation Board
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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 :
VOUT = 0.765 × (1 +
EVB_RT6206BHGQW-00
R2
)
R3
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2016
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RT6206BHGQW
Evaluation Board
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Schematic, Bill of Materials & Board Layout
EVB Schematic Diagram
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
L1
1
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
EVB_RT6206BHGQW-00
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NC
NR8040T1R4N
2016
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RT6206BHGQW
Evaluation Board
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PCB Layout
Top View (1st layer)
PCB Layout—Inner Side (2nd Layer)
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2016
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RT6206BHGQW
Evaluation Board
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PCB Layout—Inner Side (3rd Layer)
Bottom View (4th Layer)
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2016
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RT6206BHGQW
Evaluation Board
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More Information
For more information, please find the related datasheet or application notes from Richtek website
http://www.richtek.com.
Important Notice for Richtek Evaluation Board
THIS DOCUMENT IS FOR REFERENCE ONLY, NOTHING CONTAINED IN THIS DOCUMENT SHALL BE CONSTRUED AS RICHTEK’S WARRANTY, EXPRESS
OR IMPLIED, UNDER CONTRACT, TORT OR STATUTORY, WITH RESPECT TO THE PRESENTATION HEREIN. IN NO EVENT SHALL RICHTEK BE LIABLE T O
BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
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2016
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