EVB RT6219AGQW-00 EN

RT6219AGQW
Evaluation Board
your power partner.
4A, 23V, 500kHz, ACOT™ Synchronous Buck Converter
Purpose
The RT6219A is an ACOTTM synchronous Buck converter with the input voltage range from 5V to 23V and provides
4A output current. This document explains the function and use of the RT6219A 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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RT6219AGQW
Evaluation Board
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Introduction
General Product Information
The RT6219A is a synchronous Buck converter with Advanced Constant On-Time (ACOTTM) mode control which
provides a very fast transient response with no external compensators. The RT6219A operates from 5V to 23V input
voltage, provides complete protection functions including Over Current Protection (OCP), Under Voltage Protection
(UVP) and Over Voltage Protection (OVP). This IC also provides a 1.5ms internal soft-start function and an
open-drain power good indicator.
Product Feature
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5V to 23V Input Voltage Range
Adjustable from 0.6V to 5V Output Range
Up to 98% Duty for 2S Battery Application
500kHz Switching Frequency
Fixed Switching Frequency: 500kHz
ACOT™ Mode Performs Fast Transient Response
Integrated MOSFETs
 67mΩ of High-Side MOSFET
 41mΩ of Low-Side MOSFET
Supports MLCC Output Capacitors
Internal Soft-Start (1.5ms typ)
Built-in OVP/UVP/OCP
Power Good Indicator
Thermal Shutdown
Key Performance Summary Table
Key Features
Evaluation Board Number : PCB049_V1
Input Voltage Range
5V to 23V
Max Output Current
4A
Default Output Voltage
5V
Default Marking & Package Type
RT6219AGQW, WDFN-10L 3x3
Operation Frequency
500kHz at CCM
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RT6219AGQW
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Bench Test Setup Conditions
Headers Description and Placement
Top View
Bottom View
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)
EN
Enable test point
Enable Control Input. Do not leave this pin floating. The slew rate of
EN is recommended to be slower than 4.8V/µs.
GND
Ground
Ground.
PG
Power good indicator
Open-Drain Power Good Indicator Output.
VBYP
External 5V supply
Switch Over Input Supply Voltage for VCC. A low pass filter shoulde
be connected to GND, if VBYP is applied. If VBYP is not used, then
connect to GND.
VCC
Internal regulator output
5V Linear Regulator Output for Internal Control Circuit. Bypass VCC
to AGND with a 2.2µF capacitor. VCC can only supply internal
circuits. Do not connect to external loads.
BOOT
Bootstrap supply test
point
Bootstrap Supply for High-Side Gate Driver. A capacitor is needed to
drive the power switch's gate above the supply voltage. It is
connected between the SW and BOOT pins to form a floating supply
across the power switch driver.
SW
Switch node test point
Switch Node.
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Power-up & Measurement Procedure
1. Connect input power (5V < VIN < 23V) and input ground to VIN and GND test pins respectively.
2. Connect positive end and negative terminals of load to VOUT and GND test pins respectively.
3. There is a 3-pin header “J5” for enable control. To use a jumper at “VDD” option to tie EN test pin to input power
VIN for enabling the device. Inversely, to use a jumper at “GND” option to tie EN test pin and ground GND for
disabling the device.
4. Verify the output voltage (approximately 5V) between VOUT and GND.
5. Connect an external load up to 4A to the VOUT and GND terminals and verify the output voltage and current.
Output Voltage Setting
Set the output voltage with the resistive divider (R8, R4) between VOUT and GND with the midpoint connected to
FB. The output is set by the following formula :
VOUT = VFB x (1 +
EVB_RT6219AGQW-00
R4
)
R8
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Schematic, Bill of Materials & Board Layout
EVB Schematic Diagram
Bill of Materials
Reference
Qty
Part Number
Description
Package
Manufacture
U2
1
RT6219AGQW
DC/DC Converter
WDFN-10L 3x3
RICHTEK
C1, C2
2
4.7µF/25V
C-1206
C4
1
22pF/50V
C-0603
C9
1
220nF/50V
C-0603
C10, C11, C12,
C14, C18, R3
6
NC
NC
C13
1
2.2µF/50V
C-0603
C15, C16, C17
3
22µF/6.3V/0805
C-0805
C19
1
0.1µF/50V
C-0603
L1
1
2.2µH
R1, R5
2
100K
R-0603
R2, R9
2
0
R-0603
R4
1
22k
R-0603
R6
1
10M
R-0603
R8
1
3k
R-0603
EVB_RT6219AGQW-00
October 2015
NC
5
NC
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RT6219AGQW
Evaluation Board
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PCB Layout
Top View (1st layer)
PCB Layout—Inner Side (2nd Layer)
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PCB Layout—Inner Side (3rd Layer)
Bottom View
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Bottom View (4th Layer)
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 TO
BUYER OR USER FOR ANY AND ALL DAMAGES INCLUDING WITHOUT LIMITATION TO DIRECT, INDIRECT, SPECIAL, PUNITIVE OR CONSEQUENTIAL
DAMAGES.
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