Renesas RTKA211605DR0000BU User manual

Demonstration Board Manual
R16UZ0012EU0100 Rev.1.0 Page 1
Jul 13, 2021 © 2021 Renesas Electronics
The RTKA211605DR0000BU board is designed to
demonstrate and quickly evaluate the RAA211605, a
DC/DC step-down regulator with 450kHz switching
frequency.
The RAA211605 supports a wide input voltage range
(from 4.5V to 60V) and adjustable output voltage. It
can deliver up to 0.5A continuous output current with
premium load regulation and line regulation
performance.
Features
▪Simple and flexible design
▪4.5V to 60V VIN range
▪Convenient power conversion
Specifications
The following are the design specifications for the
RTKA211605DR0000BU:
▪Input voltage (VIN): 4.5V to 60V
▪Output voltage (VOUT): 3.3V
▪Max. output current: 0.5A
Figure 1. Block Diagram
VIN
EN
BST
SW
FB
VOUT
VIN Up to 60V
GND
RIN1
RIN2
CIN
CBOOT
D1
L1
COUT
RFB1
RFB2
RAA211605
RTKA211605DR0000BU

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RTKA211605DR0000BU Demonstration Board Manual
Contents
1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Quick Test Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Circuit Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2.2 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
4. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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RTKA211605DR0000BU Demonstration Board Manual
1. Functional Description
The RAA211605 is an easy-to-use Buck switching regulator with an integrated 600mΩhigh-side MOSFET. The
RTKA211605DR0000BU board demonstrates the operations of RAA211605. It allows you to evaluate the
performance of the part with different application circuits. It also provides you a reference for board layout.
The schematic is shown in Figure 4 and the PCB layers for reference are show in Figure 6 and Figure 7. Figure 8
through Figure 15 show the performance data and waveforms take from the evaluation board.
1.1 Operating Range
The board input voltage range is from 4.5V to 60V. The output voltage is set to 3.3V by default and can be
changed by R4and R5, as shown in Equation 1:
For applications where the VIN - VOUT is larger than 3V, Renesas recommends using a 20kΩresistor for R5 and
choose R4based on Equation 1. For applications where VIN - VOUT is less than 3V, Renesas recommends using
smaller R4 and R5such that there is larger than 50mA load at VOUT.
1.2 Quick Test Setup
1. Populate a jumper on J1.
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). Ensure 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 J2.
(EQ. 1)
Figure 2. RTKA211605DR0000BU Board Setup
R4R5
Vout 0.8–
0.8
--------------------------
=
+- +-
A
LOAD+ -

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RTKA211605DR0000BU Demonstration Board Manual
2. Board Design
Figure 3. RTKA211605DR0000BU Top View

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2.1 Circuit Schematic
Figure 4. RTKA211605DR0000BU Schematic
R5
20K
C1
10UF
12
C4
10UF
R4
62K
C5
TBD
TP2
C2
2.2UF
T4
TP1
SW
FB
BST
GND
EN
VIN
U1
RAA211605
1
2
3 4
5
6
T3
J1
1 2
C3
0.1UF
12
J3
12
R2
DNP
R3
20
R1
DNP
12
J2
12
C6
TBD
T2
D1
12
T1
L1
22UH
1 2
EN
EN
EN
UNNAMED_1_CON N2_I15_IN 1
UNNAMED_1_RAA211605_I 1_1A
UNNAMED_1_RAA211605_I 1_3
UNNAMED_1_RAA211605_I1_6
UNNAMED_1_SMC AP_I16_A
VIN
VIN

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RTKA211605DR0000BU Demonstration Board Manual
2.2 Bill of Materials
2.3 Board Layout
Qty Ref Des Description Manufacturer Part Number
1 C4 CAP, SMD, 1210, 10µF, 16V, 10%, X7R, ROHS Murata GRM32DR71C106KA01L
1 C3 CAP, SMD, 0603, 0.1µF, 16V, 10%, X7R, ROHS Murata GCM188R71C104KA37D
1 C2 CAP, SMD, 1210, 2.2µF, 100V, 10%, X7R, ROHS Murata GRM32ER72A225KA35L
1 L1 COIL-PWR INDUCTOR, SM, 4.8mm, 33µH, 20%, 1.2A,
ROHS
Wurth
Electronics
74408943330
4 T1, T2, T3, T4 CONN-DBL TURRET, TH, 0.218x0.078 PCB MNT,
TIN/BRASS, ROHS
Keystone 1502-1
2 J2, J3 CONN-BRD-BRD, 1x2, TH, SOCKET, 1x64 STRIP,
2.54mm, ST
Mill-max 310-93-164-41-001000
1 TP2 CONN-MINI TEST PT, VERTICAL, BLK, ROHS Keystone 5001
1 TP1 CONN-MINI TEST POINT, VERTICAL, WHITE, ROHS Keystone 5002
1 J1 CONN-HEADER, 1x2, RETENTIVE, 2.54mm, 0.230x
0.120, ROHS
BERG/FCI 69190-202HLF
1 D1 DIODE-RECTIFIER, SMD, 2P, S0D-123FL, 100V, 1A,
ROHS
On
Semiconductor
MBR1H100SFT3G
1 R3 RES, SMD, 0603, 20Ω,1/10W, 1%, ROHS Various Generic
1 R4 RES, SMD, 0603, 62kΩ,1/10W, 1%, ROHS Various Generic
1 R5 RES, SMD, 0603, 20kΩ, 1/10W, 1%, ROHS Various Generic
1 U1 IC-SWITCHING REGULATOR, 6P, TSOT-23, ROHS Renesas RAA2116054GP3
0 C1 CAP, SMD, 8.3x8.3, 10µF, 100V, 20%, ALUM.ELEC.,
ROHS
Panasonic EEE-TG2A100P
0 C6, C5, R1,
R2
DO NOT POPULATE N/A N/A
Figure 5. Silkscreen Top

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RTKA211605DR0000BU Demonstration Board Manual
Figure 6. Top Layer
Figure 7. Bottom Layer

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RTKA211605DR0000BU Demonstration Board Manual
3. Typical Performance Curves
VIN = 24V, VOUT = 3.3V, TA = +25°C, unless otherwise noted.
Figure 8. Output Ripple at No Load Figure 9. Output Ripple at Full Load
Figure 10. Enable On at Full Load Figure 11. Enable Off at Full Load
Figure 12. Load Transient between 0.25A and 0.5A Figure 13. VOUT UVP (VIN = 60V)
VOUT 20mV/Div
VPHASE 20V/Div
IL200mA/Div
2ms/Div
VOUT 20mV/Div
VPHASE 20V/Div
IL200mA/Div
1µs/Div
VOUT 2V/Div
VPHASE 20V/Div
IL500mA/Div
400µs/Div
EN 5V/Div
VOUT 2V/Div
VPHASE 20V/Div
IL500mA/Div
100µs/Div
EN 5V/Div
VOUT 100mV/Div
VPHASE 20V/Div
IL200mA/Div
1ms/Div
VOUT 100mV/Div
VPHASE 20V/Div
IL500mA/Div
10ms/Div

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RTKA211605DR0000BU Demonstration Board Manual
4. Ordering Information
5. Revision History
Figure 14. Efficiency vs Load Figure 15. Load Regulation vs Input Voltage
Part Number Description
RTKA211605DR0000BU RAA211605 Demonstration Board
Revision Date Description
1.0 Jul 13, 2021 Initial release
VIN = 24V, VOUT = 3.3V, TA = +25°C, unless otherwise noted. (Cont.)
0
10
20
30
40
50
60
70
80
90
100
0 0.1 0.2 0.3 0.4
0.5
Efficiency (%)
Load (A)
Vin = 4.5V Vin = 12V
Vin = 24V Vin = 36V
Vin = 60V
3.0
3.1
3.2
3.3
3.4
3.5
0 0.1 0.2 0.3 0.4 0.5
VOUT (V)
Load (A)
Vin = 4.5V Vin = 12V
Vin = 24V Vin = 36V
Vin = 60V

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(Rev.1.0 Mar 2020)