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4A, 23V, 500kHz, ACOT™ Synchronous Buck Converter

EVB_RT6219AGQW

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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.

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.


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

  • 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



Bench Test Setup Conditions

Headers Description and Placement

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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 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)

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.



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 :

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Schematic, Bill of Materials & Board Layout

EVB Schematic Diagram

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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

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



PCB Layout

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Top View (1st layer)

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PCB Layout—Inner Side (2nd Layer)

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PCB Layout—Inner Side (3rd Layer)

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Bottom View

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Bottom View (4th Layer)

Title Last Update Share Download
Evaluation Board User Guide 2015/11/13
Bill of Materials 2015/11/13
Gerber File 2015/11/13
Schematic 2015/11/13
RT6219
RT6219

The RT6219 is a synchronous Buck converter with Advanced Constant On-Time (ACOT®) mode control which provides a very fast transient response with no external compensators. The RT6219 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.

IC
Part NumberPackage TypePackage Qty.Free SampleDistributorStockBuy From Authorized Distributor
RT6219AGQWWDFN3x3-101,500 Request Digikey 2,806 Buy
Mouser 0 Lead-Time: 14 weeks
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