Renesas RTKA211835DE0010BU User manual

Evaluation Board Manual
R16UZ0059EU0100 Rev.1.00 Page 1
Nov 4, 2022 © 2022 Renesas Electronics
The RTKA211835DE0010BU board demonstrates
and quickly evaluates the RAA211835 (HTSSOP
version), a DC/DC asynchronous step-down regulator
with programmable switching frequency.
The RAA211835 supports a wide input voltage range
(from 4.5V to 75V) and adjustable output voltage. It
can deliver up to continuous 3A 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 design specifications of the
RTKA211835DE0010BU are shown below:
▪ Input voltage (VIN): 4.5V to 75V
▪ Output voltage (VOUT): 3.3V
▪ Maximum output current: 3A
Figure 1. RAA211835 Typical Application
VIN
EN
BST
SW
FB
V
OUT
3.3V
V
IN
Up to 75V
PGND
R
IN1
R
IN2
C
IN1
C
BOOT
L
C
OUT
3×22µF
R
FB1
R
FB2
RAA211835
EBIAS
FS
VCCAGND
C
VCC
C
IN2
VCC
SS
VCC
PG
RTKA211835DE0010BU

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RTKA211835DE0010BU 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 Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.3 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.4 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

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RTKA211835DE0010BU Evaluation Board Manual
1. Functional Description
The RAA211835 (HTSSOP version) is an easy-to-use asynchronous Buck switching regulator with an integrated
200mΩ high-side MOSFETs. The RTKA211835DE0010BU board demonstrates the operations of RAA211835
(HTSSOP version). It allows the user to evaluate the performance of the device with different application circuits
and provides the user 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 20 kΩ 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. RTKA211835DE0010BU Board Setup
R9R10
Vout 0.8–
0.8
--------------------------
•=
+ Input - - Load +

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RTKA211835DE0010BU Evaluation Board Manual
2. Board Design
2.1 Layout Guidelines
For detailed layout guidelines reference the Layout Guidelines section in the RAA211835 Datasheet.
Figure 3. RTKA211835DE0010BU Evaluation Board (Top)

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2.2 Schematic Diagrams
Figure 4. RTKA211835DE0010BU Schematic
T1
TBD
C12
TP3
1UF
C7
TP1
TBD
C11
12
J1
1 2
4.7UF
C2
DNP
R11
DNP
R6
0
R7
TBD
C18
DNP
C14
4.7UF
C3
L1
6.8UH
JP1
12
DNP
C15
12
100K
R4
0.039UF
C13
0.1UF
C4
TP4
22UF
C8
20
R8
0
R5
0
R14
4.7UF
C5
22UF
C9
DNP
R2
D1
TP2
AGND
FB
SS
EBIAS
BST
SW
SW
SW
PG
FS
VCC
EN
VIN
PGND
PGND
PGND
EPAD
RAA211835GSP
U1
22UF
C10
DNP
R1
20K R10
0
R12
0
R3
T4
47UF
C1
12
62K
R9
TP13
DNP
R13
TP5
TP6
T3
T2
TBD
C17
TP12
TBD
C16
12
J2
12
0.1UF
C6
EN
EN
FB
FB
PG
UNNAMED_3_CONN 2_I41_IN1
UNNAMED_3_RAA211835_I 47_11
UNNAMED_3_RAA211835_I 47_12
UNNAMED_3_RAA211835_I 47_13
UNNAMED_3_RAA211835_I 47_7
UNNAMED_3_SMCAP_I 22_A
UNNAMED_3_SMCAP_I23_A
UNNAMED_3_SMCAP_I55_B
UNNAMED_3_SMRES_I 10_B
UNNAMED_3_SMRES_I24_B
VCC
VCC VCC
VIN
VOUT
VOUT

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RTKA211835DE0010BU Evaluation Board Manual
2.3 Bill of Materials
Qty Reference
Designator Description Manufacturer Manufacturer Part Number
3 C8, 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
1 C13 CAP, SMD, 0603, 0.039µF, 25V, 10%, X7R, ROHS Panasonic ECJ-1VB1E393K
1L1
COIL-PWR INDUCTOR, SMD, 6.6x6.4mm, 6.8µH,
20%, 6.5A, ROHS Wurth Electronics 74439346068
4 T1, T2, T3, T4 CONN-DBL TURRET, TH, 0.218x0.078 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
5TP3, TP4, TP6,
TP12, TP13 CONN-MINI TEST PT, VERTICAL, BLK, ROHS Keystone 5001
3 TP1, TP2, TP5 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
4R3, R5, R7,
R12 RES, SMD, 0603, 0Ω, 1/10W, TF, ROHS Various VARIOUS
1 R14 RES, SMD, 0402, 0Ω, 1/10W, TF, ROHS Various VARIOUS
1 R4 RES, SMD, 0603, 100kΩ, 1/10W, 1%, TF, ROHS Various VARIOUS
1U1
IC-75V 3A PWM SWITCHING REGULATOR, 16P,
HTSSOP, ROHS Renesas RAA211835GSP#HA0
1C1
CAP, SMD, 12×10, 47µF, 100V, 20%,
ALUM.ELEC., ROHS Vishay MAL214699904E3
1 D1 DIODE SCHOTTKY 100V 10A TO277-3 OnSemi FSV10100V
0
C11, C12, C14,
C15, C16, C17,
C18, R1, R2,
R6, R11, R13
Do Not Populate N/A N/A

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RTKA211835DE0010BU Evaluation Board Manual
2.4 Board Layout
Figure 5. Silkscreen Top Layer
Figure 6. Top Layer

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RTKA211835DE0010BU Evaluation Board Manual
Figure 7. Second Layer
Figure 8. Third Layer

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RTKA211835DE0010BU Evaluation Board Manual
3. Typical Performance Graphs
Figure 9. Bottom Layer
Figure 10. Efficiency vs Load Figure 11. Load Regulation
50
55
60
65
70
75
80
85
90
95
100
0.0 0.5 1.0 1.5 2.0 2.5 3.
Efficiency (%)
Load Current (A)
5Vin 9Vin
12Vin 24Vin
36Vin 48Vin
60Vin 72Vin
3.00
3.05
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
0.0 0.5 1.0 1.5 2.0 2.5 3.
Output Voltage (V)
Load Current (A)
5Vin 9Vin
12Vin 24Vin
36Vin 48Vin
60Vin 72Vin

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RTKA211835DE0010BU Evaluation Board Manual
Figure 12. Steady State at 0.2A Load Figure 13. Steady State at 2A Load
Figure 14. Startup by EN at 1A Load Figure 15. Shutdown by EN at 1A Load
Figure 16. Overcurrent Protection Figure 17. Load Transient 1A to 3A to 1A

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RTKA211835DE0010BU Evaluation Board Manual
4. Ordering Information
5. Revision History
Part Number Description
RTKA211835DE0010BU RAA211835 (HTSSOP version) evaluation board
Revision Date Description
1.00 Nov 4, 2022 Initial release

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