Renesas RAA211805 Manual de usuario

Evaluation Board Manual

R16UZ0087EU0100 Rev.1.00 Page 1

The RAA211805 is an integrated 5V, 300mA buck

regulator with an ultra-low quiescent current (IQ) of

5.5µA. It supports a wide input voltage range from 7V

to 80V. The RAA211805 is offered in a TSOT23-5

package. The RTKA211805DE0000BU evaluation

board provides a quick and comprehensive platform

for evaluating the performance features of the

RAA211805 buck regulator.

The RTKA211805DE0000BU evaluation board

operates from a supply voltage of 7V to 80VDC,

delivering a continuous load up to 300mA at 5V

output voltage.

Specifications

This board is configured and optimized for the

following operating conditions:

▪Input voltage range: 7V to 80V

▪Output voltage: 5V

▪Up to 300mA output current capability

▪Inductor current limit of 750mA (typical) peak

▪Operating temperature range: -40°C to +125°C

Features

▪7V to 80V input supply range

▪Up to 300mA output current

▪IQ= 5.5µA at 80V, at no load conditions, switching

▪IQ= 4.5µA at 80V at no load and no switching

conditions

▪Minimum on-time of 75ns

▪Fixed 5V VOUT

▪Variable frequency operation, frequency

programmed by external inductor (15µH to 33µH)

▪Pre-bias start-up/Monotonic/ smooth start-up

▪Total of four external components

▪Protections: Overcurrent (OC) Limit, input

Undervoltage Lockout (UVLO), Over-Temperature

Protection (OTP), output Overvoltage Protection

(OVP)

▪Accurate EN threshold

Figure 1. RTKA211805DE0000BU Block Diagram

VIN

VOUT

GND

GND GND

VOUT = 5V

VSW

GND

VIN

1Meg

CIN

4.7µF

22µH

COUT2

22µF

TP3

TP1 TP2

RAA211805

COUT1

22µF

RTKA211805DE0000BU

R16UZ0087EU0100 Rev.1.00 Page 2

Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

Contents

1. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.1 Operational Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.2 Connectors, Test Points, Selection Switches, and Jumper Descriptions . . . . . . . . . . . . . . . . . . . . . . . 3

1.3 Recommended Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.4 Quick Start Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

1.5 Enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.6 Soft-Start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.7 Switching Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

2. Board Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.1 Layout Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2.2 Schematic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.3 Bill of Materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.4 Board Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

3. Typical Performance Graphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

4. Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

5. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

R16UZ0087EU0100 Rev.1.00 Page 3

Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

1. Functional Description

The RTKA211805DE0000BU evaluation board provides a comprehensive and versatile platform to asses

functionality and prototype an application with the integrated 5V, 300mA buck regulator RAA211805. The board

has options for evaluating most features of the RAA211805 and includes test points that facilitate probing.

1.1 Operational Characteristics

The RTKA211805DE0000BU evaluation board evaluates the RAA211805 with VIN from 7V to 80V and a

continuous load of 300mA. Renesas recommends operating the board within the specifications for the proper

functioning of the evaluation board.

Connect EN to VIN through a resistor, or connect EN to external logic voltage for enable and disable.

1.2 Connectors, Test Points, Selection Switches, and Jumper Descriptions

The RTKA211805DE0000BU evaluation board includes I/O connectors, test points, selection switches, and

jumpers to provide a comprehensive and versatile platform for evaluating the RAA211805 (see Tabl e 1).

1.3 Recommended Equipment

▪Power supply that can deliver 80V or higher with at least 350mA source current capability

▪Electronic load capable of sinking at least 350mA current

▪4-channel oscilloscope with voltage and current probes

1.4 Quick Start Guide

Use the Quick Setup Guide to configure and power up the board properly.

1. Set the power supply voltage to 24V and turn off the power supply. Connect the positive output of the power

supply to J1 (VIN) and the negative output to J2 (GND).

2. Connect an electronic load to J3 (VOUT) for the positive connection and J4 (GND) for the negative connection.

3. Place scope probes to VOUT (J3), VSW (TP2), and/or other test points of interest.

4. Set the load current to 0.1A and turn on the power supply. The output voltage should be in regulation with a

nominal 5V output.

5. Slowly increase the load up to 300mA. The output voltage should remain in regulation with a nominal 5V output.

6. Slowly sweep VIN from 7V to 80V. The output voltage should remain in regulation with a nominal 5V output.

7. Decrease the input voltage to 0V to shut down the regulator.

Table 1. Connectors, Test Points, Selection Switches, and Jumper Descriptions

Reference

Designator Description

J1 Input voltage positive connection

J2 Input voltage return connection

J3 Output voltage positive connection

J4 Output voltage return connection

TP1 GND test point

TP2 VSW

TP3 ENABLE test point

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Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

1.5 Enable

EN is connected to VIN through R2. EN can be driven by an external source or by removing R2. Do not leave this

pin floating.

1.6 Soft-Start

RAA211805 is naturally current limited and automatically provides a smoothly rising VOUT voltage at power up.

Because the total output of the device is limited, a startup with a heavy load generates a longer VOUT ramp; a

startup with no load generates a faster ramp.

The approximate soft-start time[1] based on the RTKA211805DE0000BU with 24V input at no load is 360µs and

590µs at full load.

1.7 Switching Frequency

The regulator is a variable frequency converter, and the switching frequency varies proportionally to the load. The

maximum switching frequency is dependent on inductance and input voltage.

Figure 2 and Figure 3 show the bench data for the evaluation board. Use Equation 1 to approximate the switching

frequency.

1. Test conditions: VIN = 24V, COUT = 2x22µF (PN:GRM187R61A226ME15D), CIN = 4.7µF (PN:GRM31CC72A475KE11L),

L = 22µH (PN:74404054330), Power supply: Chroma-632012P-100-50, Load: Resistive Load equivalent to full load at nominal Vout.

Measured from 0 to 100% of nominal VOUT.

(EQ. 1)

Figure 2. Switching Frequency (Full Load, 300mA)

vs. Input Voltage

Figure 3. Switching Frequency vs. Load Current

SwitchingFrequency 2xIload

LxIpeakxIpeakx 1

VIN VOUT–

-----------------------------------1

VOUT

------------------





xefficiency

--------------------------------------------------------------------------------------------------------------------------------------------------

100

120

140

160

180

0204060

Switching Frequency (kHz)

Input Voltage (V)

L = 22µH

100

120

140

160

0 50 100 150 200 250

300

Switching Frequency (kHz)

Load Current (mA)

L = 22µH

R16UZ0087EU0100 Rev.1.00 Page 5

Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

2. Board Design

2.1 Layout Guidelines

The printed circuit board (PCB) layout is critical for properly operating the RAA211805. The following guidelines

are recommended to achieve optimal performance.

▪Use a multilayer PCB structure to achieve optimized performance. The evaluation board

RTKA211805DE0000BU uses a 2-layer PCB with 1oz copper and a bottom layer as ground.

▪Place the input capacitor as close as possible to the IC. The input capacitor is the most important component

for any step-down converter and should be placed first in the layout.

▪The copper area of the PHASE NODE should not be more than needed. Place the inductor close to the

regulator.

▪Place an output capacitor close to the inductor.

▪Place and route the power component to keep the power loop area as minimum and short as possible.

▪Keep all the power components on the same side of the PCB.

▪Include thermal vias as necessary to improve heat dissipation.

Figure 4. RTKA211805DE0000BU Evaluation Board (Top)

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RTKA211805DE0000BU Evaluation Board Manual

2.2 Schematic Diagram

2.3 Bill of Materials

Figure 5. RTKA211805DE0000BU Schematic

Qty Reference

Designator Description Manufacturer Manufacturer

Part Number

COIL-PWR Inductor, SMD, 5mm, 22µH, 20%,

1.35A, 225mΩDCR, WW, ROHS Wurth 74404052220

1 CIN Multilayer Cap, SMD, 1206, 4.7µF, 10%, 100V Murata GRM31CC72A475KE11L

1R2

Thick Film Chip Resistor, SMD, 0603, 1M, 1%,

1/10W Generic Various

1D1

0.5A 100V Low Vf Schottky Barrier Rectifier,

SOD323 Panjit BAS100CS_R1_00001

1U1

5V, 300mA DC-DC Buck Regulator with low

quiescent current, SOT23-5 Renesas RAA211805

1 COUT1 Multilayer Cap, SMD, 0805, 22µF, 20%, 16V Generic Various

4 COUT2 Multilayer Cap, SMD, 0805, 22µF, 20%, 16V Generic Various

1 J1, J2, J3, J4 Brass Test Point Turret, 0.150 Pad, 0.100 Thole,

PCB Depth <0.078 in Keystone 1502-1

2 GND Miniature Black Test Point, 0.100 Pad, 0.040 Thole Keystone 5001

2 VSW, EN Miniature White Test Point, 0.100 Pad, 0.040 Thole Keystone 5002

VIN

VOUT

VSW

GND

22UH

1 2

COUT1

22UF

CIN1

4.7UF

22UF

COUT2

RAA2118054GP3#JA0

VOUT

GND

VIN

TP3

TP1

TP2

GND

UNNAMED _2_POWERIND_I71_AS1UNNAMED _2_POWERIND_I71_BS2

UNNAMED _2_RAA211805_I76_3UNNAMED _2_RAA211805_I76_4

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RTKA211805DE0000BU Evaluation Board Manual

2.4 Board Layout

Figure 6. Silkscreen Top

Figure 7. Top Layer

GND

GND EN

VIN

VOUT

GND

VOUT

VIN

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Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

Figure 8. Bottom Layer

Figure 9. Silkscreen Bottom

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Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

3. Typical Performance Graphs

VIN = 24V, VOUT = 5V, L = 22µH, IOUT = 300mA, COUT = 2x22µF, Ren = 1MΩ, TA= +25°C, internal compensation, internal soft-start

unless otherwise stated.

Figure 10. Startup through VIN Figure 11. Shutdown through VIN

Figure 12. Startup through EN Figure 13. Shutdown through EN

Figure 14. Short-Circuit Figure 15. Recovery from Short-Circuit and startup to

Full Load

VIN 3V/Div

VOUT 0.6V/Div

VSW 3V/Div

IL100mA/Div

520µs/Div

VIN 3V/Div

VOUT 0.6V/Div

VSW 3V/Div

IL100mA/Div

6ms/Div

VEN 0.4V/Div

VOUT 0.6V/Div

VSW 3V/Div

IL100mA/Div

300µs/Div

VEN 0.4V/Div

VOUT 0.6V/Div

VSW 3V/Div

IL100mA/Div

200µs/Div

VIN 3V/Div

VOUT 0.6V/Div

VSW 3V/Div

IL100mA/Div

100µs/Div

VIN 3V/Div

VOUT 0.6V/Div

VSW 3V/Div

IL100mA/Div

200µs/Div

R16UZ0087EU0100 Rev.1.00 Page 10

Sep 22, 2023

RTKA211805DE0000BU Evaluation Board Manual

Figure 16. Typical Operation (Full Load) Figure 17. Typical Operation (No Load)

Figure 18. Load Transient(10mA to 300mA) Figure 19. IQvs VIN (In Regulation: No Load)

Figure 20. Efficiency Figure 21. Load Regulation

VIN = 24V, VOUT = 5V, L = 22µH, IOUT = 300mA, COUT = 2x22µF, Ren = 1MΩ, TA= +25°C, internal compensation, internal soft-start

unless otherwise stated. (Cont.)

VIN 3V/Div

VOUT 50mV/Div (5V offset)

VSW 3V/Div

IL100mA/Div

20µs/Div

VIN 3V/Div

VOUT 50mV/Div (5V offset)

VSW 3V/Div

IL100mA/Div

100ms/Div

VIN 3V/Div

VOUT 50mV/Div (5V offset)

VSW 3V/Div

IL100mA/Div

560µs/Div

0204060

IQ(μA)

VIN (V)

n40C 0C

25C 55C

85C

0.0001 0.001 0.01 0.1

Efficiency (%)

Load Current (A)

12V 24V 40V

60V 80V

4.80

4.85

4.90

4.95

5.00

5.05

5.10

0.001 0.101 0.201 0.301

Output Voltage(V)

Load Current (A)

12V 24V 40V

60V 80V

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