Renesas RTKA211820DE0000BU User manual

Evaluation Board Manual
R16UZ0045EU0100 Rev.1.00 Page 1
Jul 1, 2022 © 2022 Renesas Electronics
The RTKA211820DE0000BU board demonstrates
and quickly evaluates the RAA211820 (QFN version),
a DC/DC synchronous step-down regulator with
programmable switching frequency.
The RAA211820 supports a wide input voltage range
(from 4.5V to 75V) and adjustable output voltage. It
delivers up to a continuous 2A output current with
premium load regulation and line regulation
performance.
Features
▪ Simple and flexible design
▪ 4.5V to 75V VIN range
▪ Convenient power conversion
Specifications
The following are the design specifications for the
RTKA211820DE0000BU:
▪ Input voltage (VIN): 4.5V to 75V
▪ Output voltage (VOUT): 3.3V
▪ Maximum output current: 2A
Figure 1. Block Diagram
VIN
EN
BST
SW
FB
V
OUT
V
IN
Up to 75V
PGND
R
IN1
R
IN2
C
IN1
C
BOOT
LC
OUT1
22µF
R
FB1
R
FB2
RAA211820
C
OUT2
22µF
EBIAS
FS
VCCAGND
C
VCC
C
IN2
VCC
SS
VCC
PG
RTKA211820DE0000BU

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RTKA211820DE0000BU Evaluation Board Manual
Contents
1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Operational Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Setup and Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

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RTKA211820DE0000BU Evaluation Board Manual
1. Functional Description
The RAA211820 (QFN version) is an easy-to-use synchronous Buck switching regulator with an integrated
215mΩ/115mΩ high-side/low-side MOSFETs. The RTKA211820DE0000BU board demonstrates the operations of
RAA211820 (QFN version). The board allows you to evaluate the performance of the part with different application
circuits, and it provides you with a reference for a board layout.
1.1 Operational Characteristics
The board input voltage range is from 4.5V to 75V. The output voltage is set to 3.3V by default and can be
changed by R9 and R10, as shown in Equation 1:
Renesas recommends using a 20kΩ resistor for R10 and choose R9 based on Equation 1.
1.2 Setup and Configuration
1. Populate a jumper on JP1(VIN shorted to EN).
2. Connect the power supply to the input terminals VIN(T1) and GND(T2). Connect the load to the output
terminals VOUT(T3) and GND(T4). Make sure the setup is correctly connected before applying any power or
load to the board.
3. Turn on the power supply and the part should start operating.
4. Verify that the output voltage is 3.3V and phase node waveforms can be monitored at J1.
(EQ. 1)
Figure 2. RTKA211820DE0000BU Board Setup
R9R10
VOUT 0.8–
0.8
------------------------------
•=

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RTKA211820DE0000BU Evaluation Board Manual
2. Board Design
2.1 Layout Guidelines
For detailed layout guidelines, reference the Layout Guidelines section in the RAA211820 Datasheet.
Figure 3. RTKA211820DE0000BU Evaluation Board (Top)
Figure 4. RTKA211820DE0000BU Evaluation Board (Bottom)

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2.2 Schematic Diagram
Figure 5. RTKA211820DE0000BU Schematic
C7
1UF
62K
R9
TP1
C5
4.7UF
T4
4.7UF
C2
0.1UF
C6
TBD
C12
JP1
12
C10
22UF
TP3
DNP
R11
TP2
T3
4.7UF
C3
0
R7
DNP
R2
0
R3
12
J2
12
10UH
L1
DNP
R1
FS
PG
AGND
VIN
FB
BST
SW
EBIAS
VCC
VIN
VIN
EN
PGND
RAA2118204GNP
U1
C11
TBD
C4
0.1UF
12
J1
1 2
47UF
C1
12
R4
100K
20
R8
TP4
T2
0
R5
TBD
C8
T1
R6
DNP
20K R10
22UF
C9
EN
EN
FB
FB
UNNAMED_1_CON N2_I41_IN 1
UNNAMED_1_RAA211820_I 49_4
UNNAMED_1_RAA211820_I 49_5
UNNAMED_1_RAA211820_I 49_8
UNNAMED_1_RAA211820_I49_9
UNNAMED_1_SMCAP_I23_A
UNNAMED_1_SMRES_I10_B
UNNAMED_1_SMR ES_I24_B
VCC
VCC
VIN
VOUT
VOUT

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RTKA211820DE0000BU Evaluation Board Manual
2.3 Bill of Materials
Qty Reference
Designator Description Manufacturer Manufacturer
Part Number
2 C9, C10 CAP, SMD, 1210, 22µF, 16V, 10%, X7R, RoHS Murata GRM32ER71C226KE18L
1 C7 CAP, SMD, 0603, 1.0µF, 16V, 10%, X7R, RoHS TDK C1608X7R1C105K
1 C6 CAP, SMD, 0603, 0.1µF, 16V, 10%, X7R, RoHS Murata GCM188R71C104KA37D
1 C5 CAP, SMD, 0603, 4.7µF, 10V, 10%, X7S, RoHS Murata GRM188C71A475KE11D
1 C4 CAP, SMD, 0603, 0.1µF, 100V, 10%, X7R, RoHS Murata GRM188R72A104KA35J
2C2, C3
CAP-AEC-Q200, SMD, 1210, 4.7µF, 100V, 10%,
X7R, RoHS TDK CNA6P1X7R2A475K250AE
1L1
COIL-PWR INDUCTOR, SMD, 6.6×6.4mm, 10µH,
20%, 7.6A, RoHS Wurth Electronics 74439346100
4 T1, T2, T3, T4 CONN-DBL TURRET, TH, 0.218×0.078 PCB MNT,
TIN/BRASS, RoHS Keystone 1502-1
2J1, J2
CONN-BRD-BRD, 1×2, TH, SOCKET, 1×64
STRIP, 2.54mm, ST Mill-Max 310-43-164-41-001000
2 TP3, TP4 CONN-MINI TEST PT, VERTICAL, BLK, RoHS Keystone 5001
2TP1, TP2
CONN-MINI TEST POINT, VERTICAL, WHITE,
RoHS Keystone 5002
1JP1
CONN-HEADER, 1×2, RETENTIVE, 2.54mm,
0.230×0.120, RoHS BERG/FCI 69190-202HLF
1 R10 RES, SMD, 0603, 20kΩ, 1/10W, 1%, TF, RoHS Various Various
1R9
RES-AEC-Q200, SMD, 0603, 62K, 1/10W, 1%,
RoHS Panasonic ERJ-3EKF6202V
1R8
RES-AEC-Q200, SMD, 0603, 20Ω, 1/10W, 1%, TF,
RoHS Panasonic ERJ-3EKF20R0V
3 R3, R5, R7 RES, SMD, 0603, 0Ω, 1/10W, TF, RoHS Various Various
1 R4 RES, SMD, 0603, 100kΩ, 1/10W, 1%, TF, RoHS Various Various
1U1
IC-80V 2A PWM SWITCHING REGULATOR, 16P,
QFN, RoHS Renesas RAA211820GNP#HA0
0C1
CAP, SMD, 12×10, 47µF, 100V, 20%,
ALUM.ELEC., RoHS Vishay MAL214699904E3
0
C8, C11, C12,
R1, R2,
R6, R11
Do Not Populate N/A N/A

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RTKA211820DE0000BU Evaluation Board Manual
2.4 Board Layout
Figure 6. Top Layer
Figure 7. Second Layer

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RTKA211820DE0000BU Evaluation Board Manual
.
Figure 8. Third Layer
Figure 9. Bottom Layer

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RTKA211820DE0000BU Evaluation Board Manual
3. Typical Performance Graphs
Figure 10. Efficiency vs Load Figure 11. Load Regulation
Figure 12. Output Ripple at No Load Figure 13. Output Ripple at 2A Load
Figure 14. Startup by EN with No Load Figure 15. Shutdown by EN with 2A Load
60
65
70
75
80
85
90
95
100
0.0 0.5 1.0 1.5 2.0
Efficiency (%)
Output Current (A)
VIN = 4.5V
VIN = 7V
VIN = 12V
VIN = 24V
VIN = 48V
VIN = 76V
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
0.0 0.5 1.0 1.5
2.0
V
OUT
Regulation (%)
Output Current (A)
VIN = 4.5V
VIN = 7V
VIN = 12V
VIN = 24V
VIN = 48V
VIN = 76V
SW 5V/Div
VOUT 20mV/Div
IL0.5A/Div
80µs/Div
SW 10V/Div
VOUT 20mV/Div
Load 1A/Div
1µs/Div
SW 10V/Div
VOUT 2V/Div
IL0.5A/Div
400µs/Div
EN 5V/Div
SW 10V/Div
VOUT 2V/Div
IL0.5A/Div
400µs/Div
EN 5V/Div

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RTKA211820DE0000BU Evaluation Board Manual
4. Ordering Information
5. Revision History
Figure 16. Overcurrent Protection Figure 17. Load Transient 1A to 2A to 1A
Part Number Description
RTKA211820DE0000BU RAA211820 (QFN version) evaluation board
Revision Date Description
1.00 Jul 1, 2022 Initial release
SW 35V/Div
VOUT 2V/Div
IL2A/Div
40µs/Div
PG 5V/Div
SW 20V/Div
VOUT 0.1V/Div
IL2A/Div
800µs/Div
Load 2A/Div

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