RTQ2820AGQWF Evaluation Board

Product Specifications

  • Input Voltage Range: 3.5V – 17V
  • Output Current: 0A – 20A
  • Default Output Voltage: 1.2V
  • Operation Frequency: 800 kHz
  • Output Ripple Voltage: 10mVp-p
  • Line Regulation: 0%
  • Load Regulation: 0%
  • Load Transient Response: —
  • Maximum Efficiency: 85.8%

Product Usage Instructions

Power-up Procedure

Suggestion Required Equipments:

  • RTQ2820AGQWF Evaluation Board
  • DC power supply capable of at least 17V and 7A
  • Electronic load capable of 20A
  • Function Generator
  • Oscilloscope

Quick Start Procedures:

  1. With power off, connect the input power supply to the VIN and
    GND pins.
  2. With power off, connect the electronic load between the VOUT
    and nearest GND pins.
  3. Turn on the power supply at the input. Ensure the input voltage
    does not exceed 17V on the Evaluation Board.
  4. Check the proper output voltage using a voltmeter.
  5. Adjust the load within the operating ranges and observe the
    output voltage regulation, ripple voltage, efficiency, and other
    performance.

Detailed Description of Hardware

Headers Description and Placement

Carefully inspect all components used in the EVB according to
the Bill of Materials table. Ensure all components are undamaged
and correctly installed.

Test Points

Test Point/ Pin NameFunction
J1VIN input voltage connector
J2PGND connection for input
J3VOUT output voltage connector
J4PGND connection for output
JP1VIN voltage sensing for efficiency test points
JP2VOUT voltage sensing for efficiency test points
JP3VOUT voltage measuring for waveform test points

FAQ (Frequently Asked Questions)

Q: What should I do if any component is missing or
damaged?

A: If any component is missing or damaged,
please contact our distributors or email us at
evb_service@richtek.com for assistance.

“`

your power partner.

RTQ2820AGQWF Evaluation Board

20A, 17V, ACOT® High-Efficiency Synchronous Step-Down Converter Evaluation Board

General Description
This user guide contains information for the RTQ2820AGQWF DC-DC converter. Also included are the performance specifications, the schematic, and the list of materials for the RTQ2820AGQWF.
Table of Contents
General Description ……………………………………………………………………………………………………………………………………1 Performance Specification Summary ……………………………………………………………………………………………………………2 Power-up Procedure …………………………………………………………………………………………………………………………………..2 Detailed Description of Hardware …………………………………………………………………………………………………………………3 Bill of Materials…………………………………………………………………………………………………………………………………………..5 Typical Applications ……………………………………………………………………………………………………………………………………6 Evaluation Board Layout……………………………………………………………………………………………………………………………10 More Information………………………………………………………………………………………………………………………………………13 Important Notice for Richtek Evaluation Board……………………………………………………………………………………………..13

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RTQ2820AGQWF Evaluation Board

Performance Specification Summary

A summary of the RTQ2820AGQWF Evaluation Board performance specification is provided in Table 1. The ambient temperature is 25°C.

Table 1. RTQ2820AGQWF Evaluation Board Performance Specification Summary

Specification

Test Conditions

Min Typ Max

Input Voltage Range

3.5 12 17

Output Current

0

20

Default Output Voltage

— 1.2 —

Operation Frequency

— 800 —

Output Ripple Voltage

IOUT = 20A

10

Line Regulation

IOUT = 10A, VIN = 3.5V to 17V

— ±0.5 —

Load Regulation

VIN = 12V, IOUT = 0.001A to 20A

— ±0.5 —

Load Transient Response

IOUT = 10mA to 20A

±5

Maximum Efficiency

VIN = 12V, VOUT = 1.2V, IOUT = 20A

— 85.8 —

Unit V A V
kHz mVp-p
% % % %

Power-up Procedure
Suggestion Required Equipments RTQ2820AGQWF Evaluation Board DC power supply capable of at least 17V and 7A Electronic load capable of 20A Function Generator Oscilloscope
Quick Start Procedures The Evaluation Board is fully assembled and tested. Follow the steps below to verify board operation. Do not turn on supplies until all connections are made. When measuring the output voltage ripple, care must be taken to avoid a long ground lead on the oscilloscope probe. Measure the output voltage ripple by touching the probe tip and ground ring directly across the last output capacitor.
Proper measurement equipment setup and follow the procedure below. 1) With power off, connect the input power supply to the VIN and GND pins. 2) With power off, connect the electronic load between the VOUT and nearest GND pins. 3) Turn on the power supply at the input. Make sure that the input voltage does not exceeds 17V on the Evaluation
Board. 4) Check for the proper output voltage using a voltmeter. 5) Once the proper output voltage is established, adjust the load within the operating ranges and observe the
output voltage regulation, ripple voltage, efficiency, and other performance.

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Detailed Description of Hardware
Headers Description and Placement

RTQ2820AGQWF Evaluation Board

Carefully inspect all the components used in the EVB according to the following Bill of Materials table, and then make sure all the components are undamaged and correctly installed. If there is any missing or damaged component, which may occur during transportation, please contact our distributors or e-mail us at evb_service@richtek.com.

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RTQ2820AGQWF Evaluation Board

Test Points

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

Test Point/ Pin Name

Function

J1

VIN input voltage connector

J2

PGND connection for input

J3

VOUT output voltage connector

J4

PGND connection for output

JP1

VIN voltage sensing for efficiency test points

JP2

VOUT voltage sensing for efficiency test points

JP3

VOUT voltage measuring for waveform test points

JP4

Connects EN to VIN to enable the device.

JP5

Connects PGOOD to VCC through a 100k.

JP6

Mode selection

EN

EN test point

SS/TR

Can be used to monitor the reference voltage.

VCC

VCC test point

PGOOD

PGOOD output test point

MODE

Mode selection test point

RLIM

Can be used to monitor the voltage level of the valley current limit.

SW

Switch node test point

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Bill of Materials

RTQ2820AGQWF Evaluation Board

VIN = 12V, VOUT = 1.2V, IOUT = 20A, fSW = 800kHz

Reference Count

Part Number

Value

Description

Package Manufacturer

U1

1

RTQ2820AGQWF

Step-Down Converter

WQFN-21TL 3×4 (FC)

RICHTEK

L1

1 VLBU1007090T-R33L

0.33µH

Inductor, Isat = 39A, 180µ

TDK

C1, C2, C3 3 GRM31CR71E106KA12L

10µF

Capacitor, Ceramic, 25V, X7R

1206

MURATA

C4, C5 2 GRM155C81E105KE11D

1µF

Capacitor, Ceramic, 25V, X6S

0402

MURATA

C6

1 GRM188R60J105KA01D

1µF

Capacitor, Ceramic, 6.3V, X5R

0603

MURATA

C7

1 GRM188R71H471KA01D

470pF

Capacitor, Ceramic, 50V, X7R

0603

MURATA

C8, C10, C18, C19

4

GRM188R71H104KA93D

0.1µF

Capacitor, Ceramic, 50V, X7R

0603

MURATA

C9

1 GRM188R71H223KA01D

22nF

Capacitor, Ceramic, 50V, X7R

0603

MURATA

C11, C12, C13, C14, 6 C15, C16

GRM31CR60J476ME19

47µF

Capacitor, Ceramic, 6.3V, X5R

1206

MURATA

EC1

1

250ARHA221M08A2

220µF

Capacitor, Solid, 25V, 105C

APAQ

R1, R2 2

WR06X1002FTL

10k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R3, R4, R7 3

WR04X000 PTL

0

Resistor, Chip, 1/10W, 1%

0402

WALSIN

R5

1

WR06X4991FTL

4.99k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R6

1

WR06X000 PTL

0

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R8, R9, R10

3

WR06X1003FTL

100k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R11

1

WR06X2433FTL

243k

Resistor, Chip, 1/10W, 1%

0603

WALSIN

R12

1

RTT031213FTP

121k

Resistor, Chip, 1/10W, 1%

0603

RALEC

R13

1

RTT033012FTP

30.1k

Resistor, Chip, 1/10W, 1%

0603

RALEC

R14

1

CR0603F60K4P05Z

60.4k

Resistor, Chip, 1/10W, 1%

0603

EVER OHMS

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Typical Applications

RTQ2820AGQWF Evaluation Board

EVB Schematic Diagram

J1

VIN

4

3

5

1

2

VIN

21

VIN_SNS+ AZ1

1

J2

GND

4

3

5

1

2

2

2

1

2

1

+ EC1

C1

C2

C3

C4

2

1

2

1

21

JP1 1
12 2
SIP-2P

VIN_SNS+ VIN_SNS-

1

AZ2 VIN_SNS-
C6

2

2

1

2

1

VIN

10

VIN_10

21 VIN_21
C5

EN

8

EN

PGOOD 9 PGOOD

MODE 4 MODE

VCC

19 VCC

RLIM

3 RLIM

R5

AGND

2 AGND

20 SW
1 BST

SW

RBOOT

R6

BST 1

2

CBOOT

C10

1

2

7 FB FB

0/0603

6 RGND

RGND

1

C8

2

5 SS/TR

SS/TR

1

18 PGND

PGND_18 17 PGND_17 16

C9

2

PGND_16 15

PGND_15 14

PGND_14 13

PGND_13 12

PGND_12 11

PGND_11

R7

1

2

21

AZ9 FB

2

1

2

L1

1

2

21

VOUT_SNS1+ AZ3

1

1

1

C11

C12

C13

2

2

2

21

AZ4 VOUT_SNS1-

VOUT_SNS1+ JP2

1 21
2

VOUT_SNS1-

SIP-2P

For efficiency test

R3

1

2

VOUT_SNS2+

1

CFF

R1

C7

1

AZ9 place to VCC’PGND

2

R2 RGND

R4

1

2

VOUT_SNS2-

2

1

VOUT

21

VOUT_SNS2+ AZ5

1

1

1

+ C17

C14

C15

C16

2

2

2

47uF/6.3V/X5R/1206

21

AZ6 VOUT_SNS2-

2

1

J3

VOUT

4

3

5

1

2

JP3

1

C18

21 2

SIP-2P

J4

GND

4

3

5

1

2

VOUT waveform test

2

PGOOD & EN PINS PULL-UP SELECTION

VIN

VCC

1

1

JP4
1 12 2 SIP-2P

1

2

R8 EN
R9

JP5
1 12 2 SIP-2P

2

R10 PGOOD

GOLDEN PINS & TEST PINS

TP1 EN 1
EN

TP3 PGOO1D
PGOOD

TP5 RLIM 1
RLIM

VCC

TP7

1

VCC

TP2 SS/TR1
SS/TR TP4
MODE1
MODE
TP6 SW 1
SW
TP8 BST 1
BST

GP1 1
GND
GP2 1
GND

MODE SELECTIONS

MODE

JP6

1

2

3

4

5

6

7

8

9

10

11

12

1

1

Mode Selection

R14

R13

1

VCC

1

1

C19

R12

R11

2

2

2

2

2

1-2: VCC ->AGND PSM 600kHz 3-4: 243k ohm to AGND PSM 800kHz 5-6: 121k ohm to AGND PSM 1000kHz 7-8: Short to AGND FCCM 600kHz 9-10: 30.1k ohm to AGND FCCM 800kHz 11-12: 60.4k ohm to AGND FCCM 1000kHz

1. The capacitance values of the input and output capacitors will influence the input and output voltage ripple. 2. MLCC capacitors have degrading capacitance at DC bias voltage, and especially smaller size MLCC capacitors
will have much lower capacitance.

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Measure Result Output Ripple Measurement

RTQ2820AGQWF Evaluation Board
Output Ripple Measurement

Load Transient Response

Load Transient Response

Power On from EN

Power Off from EN

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Power On from EN

RTQ2820AGQWF Evaluation Board
Power Off from EN

Overcurrent Protection

Short-Circuit Protection and Recovery

Overvoltage Protection

Efficiency vs. Output Current

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Output Voltage vs. Output Current

RTQ2820AGQWF Evaluation Board
Output Voltage vs. Input Voltage

Thermal Image at VIN = 12V, VOUT = 1.2V, IOUT = 20A

Note: Care must be taken to avoid a long ground lead on the oscilloscope probe when measuring the input or output voltage ripple. Measure the output voltage ripple by touching the probe tip directly across the output capacitor.

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RTQ2820AGQWF Evaluation Board

Evaluation Board Layout

Figures 1 to 4 show the RTQ2820AGQWF Evaluation Board layout. This board size is 85mm x 80mm and is constructed on a four-layer PCB, with outer layers of 2 oz. Cu and inner layers with 2 oz. Cu.

Figure 1. Top View (1st layer)

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RTQ2820AGQWF Evaluation Board

Figure 2. PCB Layout–Inner Side (2nd Layer)

Figure 3. PCB Layout–Inner Side (3rd Layer)

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RTQ2820AGQWF Evaluation Board

Figure 4. Bottom View (4th Layer)

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RTQ2820AGQWF Evaluation Board

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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Documents / Resources

RICHTEK RTQ2820AGQWF Evaluation Board [pdf] User Guide
RTQ2820AGQWF Evaluation Board, RTQ2820AGQWF, Evaluation Board, Board

References

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