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:
- With power off, connect the input power supply to the VIN and
GND pins. - With power off, connect the electronic load between the VOUT
and nearest GND pins. - Turn on the power supply at the input. Ensure the input voltage
does not exceed 17V on the Evaluation Board. - Check the proper output voltage using a voltmeter.
- 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 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 |
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 |
