Renesas RTKA211250DE0010BU User manual

Evaluation Board Manual
R16UZ0038EU0101 Rev.1.01 Page 1
Oct 7, 2022 © 2022 Renesas Electronics
The RTKA211250DE0010BU board evaluates the
RAA211250 (HTSSOP version), a DC/DC
synchronous step-down regulator with programmable
switching frequency.
The RAA211250 supports a wide input voltage range
(from 4.5V to 30V) and adjustable output voltage. It
delivers up to continuous 3A output current with
premium load regulation and line regulation
performance.
Features
▪Simple and flexible design
▪4.5V to 30V VIN range
▪Convenient power conversion
Specifications
The following are the design specifications for the
RTKA211250DE0010BU:
▪Input voltage (VIN): 4.5V to 30V
▪Output voltage (VOUT): 3.3V
▪Maximum output current: 5A
Figure 1. Simplified Circuit
VIN
EN
BST
SW
FB
V
OUT
3.3V
V
IN
Up to 30 V
PGND
R
IN1
R
IN2
C
IN1
C
BOOT
L
R
FB1
R
FB2
RAA211250
C
OUT
3×47µF
EBIA
S
FS
VCCAGND
C
VCC
C
IN2
VCC
SS
VCC
PG
RTKA211250DE0010BU

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RTKA211250DE0010BU 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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RTKA211250DE0010BU Evaluation Board Manual
1. Functional Description
The RAA211250 (HTSSOP version) is an easy-to-use synchronous Buck switching regulator with integrated
90mΩ(high-side) and mΩ(low-side) MOSFETs. The RTKA211250DE0010BU board demonstrates the
operations of RAA211250 (HTSSOP version). The board allows you to evaluate the performance of the part with
different application circuits, and it also provides you a reference for board layout.
The manual includes a schematic (Figure 4), PCB layers (Figure 5 through Figure 8), performance data and
waveforms taken from the evaluation board (Figure 9 through Figure 16), and a full list of materials (Bill of
Materials).
1.1 Operational Characteristics
The board input voltage range is from 4.5V to 30V. The output voltage is set to 3.3V by default and can be
changed by R9and R10, as shown in Equation 1:
Renesas recommends using a 20kΩresistor for R10 and choose R9based 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. RTKA211250DE0010BU Board Setup
R9R10
Vout 0.8–
0.8
--------------------------
=
+
-
LOAD
+
-
A

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RTKA211250DE0010BU Evaluation Board Manual
2. Board Design
2.1 Layout Guidelines
For detailed layout guidelines reference the Layout Guidelines section in the RAA211250 Datasheet.
Figure 3. RTKA211250DE0010BU Evaluation Board (Top)

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RTKA211250DE0010BU Evaluation Board Manual
2.2 Schematic Diagram
Figure 4. RTKA211250DE0010BU Schematic
ENGINEER: DATE:DRAW N
BY:
DATE:
ZHUANGYAO TANG ZHUANGYAO TANG
C2
4.7UF
C6
0.1UF
20K
R10
TP1
0
R3
C9
47UF
C13
0.039UF
62K
R9
JP1
12
R4
100K
T4
C3
4.7UF
0
R12
TBD
C12
R5
0
C10
47UF
TP3
12
J1
1 2
DNP
R11
DNP
R2
T3
0.1UF
C4
R1
DNP
12
J2
12
1UF
C7
C1
100UF
DNP
R6
TBD
C11
C5
4.7UF
R7
0
T2
20
R8
TP4
L1
3.3UH
T1
EPAD PGND PGND PGND VIN EN VCC FS PG
SW SW SW
BST
EBIAS
SS FB
AGND
RAA211504GSP
U1
1 2 3 4 5 6 7 8 9
10 11 12 13 14 15 16
17
TP2
47UF
C8
EN
EN
FB
FB
UNNAMED_1_CONN2_I41_IN1
UNNAMED_1_RAA211450_I47_11 UNNAMED_1_RAA211450_I47_12 UNNAMED_1_RAA211450_I47_13
UNNAMED_1_RAA211450_I47_7
UNNAMED_1_SMCAP_I23_A
UNNAMED_1_SMRES_I10_A
UNNAMED_1_SMRES_I10_B
UNNAMED_1_SMRES_I24_B
VCC
VCC VCC
VIN
VOUT
VOUT

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RTKA211250DE0010BU Evaluation Board Manual
2.3 Bill of Materials
Qty Ref Des Description Manufacturer Part Number
3C8, C9,
C10 CAP, SMD, 1210, 47µF, 10V, 10%, X7R, ROHS Murata GRM32ER71A476KE15L
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, 0402, 0.1µF, 50V,10%, X5R, ROHS TDK CGA2B3X5R1H104K050BB
2 C2, C3 CAP, SMD, 1206, 10µF, 50V, 10%, X5R, ROHS TDK C3216X5R1H106K
1L1
COIL-PWR INDUCTOR, SMD, 6.6mmx6.4mm, 6.8µH, 20%,
6.5A, ROHS
Wurth
Electronics 74439344033
4T1, T2,
T3, T4
CONN-DBL TURRET, TH, 0.218x0.078 PCB MNT,
TIN/BRASS, ROHS Keystone 1502-1
2J1,J2
CONN-BRD-BRD, 1x2, TH, SOCKET, 1x64 STRIP, 2.54mm,
ST Mill-max 310-43-164-41-001000
1 TP3, TP4 CONN-MINI TEST PT, VERTICAL, BLK, ROHS Keystone 5001
1 TP1, TP2 CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS Keystone 5002
1JP1
CONN-HEADER, 1x2, RETENTIVE, 2.54mm, 0.230x 0.120,
ROHS BERG/FCI 69190-202HLF
1 R10 RES, SMD, 0603, 20kΩ, 1/10W, 1%, ROHS Various Generic
1 R9 RES, SMD, 0603, 62kΩ, 1/10W, 1%, ROHS Panasonic ERJ-3EKF6202V
1 R8 RES, SMD, 0603, 20Ω, 1/10W, 1%, ROHS Panasonic ERJ-3EKF20R0V
3R3, R5,
R7 RES, SMD, 0603, 0Ω, 1/10W, ROHS Various Generic
1 R4 RES, SMD, 0603, 100kΩ, 1/10W, 1%, ROHS Various Generic
1U1
IC-5A DC/DC STEP DOWN
REGULATOR,16P,HTSSOP,ROHS Renesas RAA211250GSP#HA0
0 C1 CAP, 12x10, 100µF, 63V, 20%, ALUM.ELEC., ROHS Vishay MAL214699904E3
0
C11,
C12, R1,
R2, R6,
R11
DO NOT POPULATE N/A N/A

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RTKA211250DE0010BU Evaluation Board Manual
2.4 Board Layout
Figure 5. Top Layer
Figure 6. Second Layer

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RTKA211250DE0010BU Evaluation Board Manual
Figure 7. Third Layer
Figure 8. Bottom Layer

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RTKA211250DE0010BU Evaluation Board Manual
3. Typical Performance Graphs
VIN = 24V, VOUT = 3.3V, TA= +25°C, unless otherwise noted.
Figure 9. Efficiency vs Load Figure 10. Load Regulation
Figure 11. Output Ripple at No Load Figure 12. Output Ripple at Full Load
Figure 13. Enable On at Full Load with Internal SS Figure 14. Enable Off at Full Load with Internal SS
70
75
80
85
90
95
100
01234
5
Efficiency (%)
Output Current (A)
5Vin
12Vin
24Vin
3.28
3.28
3.28
3.28
3.28
3.28
3.28
3.28
3.28
3.28
3.29
3.29
3.29
3.29
3.29
3.29
01234
5
Output Voltage (V)
Output Current (A)
5Vin
12Vin
24Vin
40µs/Div
VOUT 20mV/Div
SW 5V/Div
2µs/Div
VOUT 20mV/Div
SW 5V/Div
VOUT 2V/Div
IL2A/Div
VPHASE 20V/Div
EN 5V/Div
PG 5V/Div
400µs/Div
VOUT 2V/Div
IL2A/Div
VPHASE 20V/Div
EN 5V/Div
PG 5V/Div
20µs/Div

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RTKA211250DE0010BU Evaluation Board Manual
4. Ordering Information
5. Revision History
Figure 15. Load Ramp from 50mA to 2.5A Figure 16. OCP by Short VOUT
Part Number Description
RTKA211250DE0010BU RAA211250 (HTSSOP Version) Evaluation Board
Revision Date Description
1.01 Oct 7, 2022 Updated Figure 1.
1.00 May 9, 2022 Initial release
VIN = 24V, VOUT = 3.3V, TA= +25°C, unless otherwise noted. (Cont.)
VOUT 50mV/Div
IL1A/Div
SW 5V/Div
200µs/Div
Load 1A/Div
200µs/Div
VOUT 1V/Div
IL2A/Div
SW 20V/Div
VIN 1V/Div