IDT WP3W-RK User Manual

≤ 3W Wireless Power Receiver and

Transmitter Reference Kit

WP3W-RK

Reference Kit Manual

© 2016 Integrated Device Technology, Inc 1 May 16, 2016

Features

 Fully-functional wireless power receiver and transmitter for

plug-and-play prototyping

 High efficiency transfer up to 79% at 5V/600mA
 Three coil size options meet various application requirements

— 30 mm diameter for 3W applications
— 20 mm diameter for 2W applications
— 15 mm diameter for 1W applications

 Low BOM cost and high density PCB design for ultra-compact

applications

 Receiver (Rx) has 4-layer, performance-optimized PCB

reference layout for copying to system board

 Transmitter (Tx) has 2-layer, performance-optimized PCB

reference layout for copying to system board

 5.0V @ up to 0.6A output targets for wearable and many other

lower power applications

 Only 2 high-voltage capacitors necessary for Rx
 LED indicator to indicate power transfer on both Rx and Tx

boards

 Break-away coil mount enables fast prototyping
 Programmable output voltage from 4.5V to 6V
 Over temperature protection and programmable over current

protection on Rx board

 Selectable Tx input current limit capability for USB protection.
 Programmable LED pattern on the Tx board
 Supported by an extensive library of digital resources to ease

design-in effort

 Application notes, datasheets, manuals, guides, videos, layout

files, and other digital resources can be found at:

www.IDT.com/WP3W-RK

Description

IDT’s wireless power reference kit targets applications ranging

from 0.5 to 3W. The reference kit is comprised of both the
transmitter (P9235A-R-EVK) and the receiver (P9027LP-R-EVK)
with three different coil size options supporting applications with
different form factors and power levels. The high-efficiency,
turnkey reference design is supported by comprehensive online,
digital resources to significantly ease design-in effort and enable
rapid prototyping.

The receiver design is based on the P9027LP-R, a highly
integrated, high efficiency solution suited to a wide range of
compact applications requiring up to 600mA load current. The
layout has been optimized on a 4-layer PCB, compliant with
wearable device layout rules and form factors. The ultra-compact
form factor is ideal for rapid product prototyping. The active area
of the P9027LP-R-EVK board is 5.7 mm x 5.7 mm and is ideal for
small form factor and thermally-constrained applications.

The transmitter design is based on the P9235A-R and can be
powered from a micro-USB or other input voltage from 4.5V to

5.5V. The P9235A-R is based on a flexible 32-bit ARM® Cortex®­M0 processor with integrated full bridge power stage drivers and
on-chip simultaneous voltage and current demodulation. It
provides a low component count solution on an optimized 2-layer
hardware reference layout intended for seamless copy/paste to a
customer application board. The active area of the P9235A-R
board is 22.7mm x 21.2mm and is ideal for space-constrained,
low power transmitter designs.

Figure 1. Kit Photograph

Kit Contents

 Fully-assembled P9027LP-R-EVK and P9235A-R-EVK

reference boards fitted with 2W coils

 Two additional coil sets for 1W and 3W output power
 1.5 ft. USB cable

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc 2 May 16, 2016

Hardware Overview

Figure 2. P9027LP-R-EVK Reference Board Illustration Top Layer

Figure 3. P9235A-R-EVK Reference Board Illustration Top Layer

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc 3 May 16, 2016

Figure 4. Tx and Rx Coil Pairs for 1W, 2W and 3W Applications

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© 2016 Integrated Device Technology, Inc 4 May 16, 2016

Usage Guide

These reference boards are designed to demonstrate the performance and functionality of the P9027LP-R and P9235A-R as a fully-functional
wireless power receiver and transmitter pair. This solution is suitable for wearable devices as well as other end products that require up to 3W
output power from the wireless power receiver. In most cases, these boards can be imported into an existing customer system for evaluation
and prototyping. The WP3W-RK evaluation kit is based on the WPC Qi standard protocol but targets ‘paired’ transmitter-receiver solutions –
sometimes called end-to-end customer applications where the receiver is only expected to work with a known transmitter.

Quick-Start Guide

Follow these simple steps to power-up and begin using the P9027LP-R-EVK and P9235A-R-EVK boards:

1. Power up the P9235A-R-EVK board by connecting the USB cable to either a notebook computer or a USB adaptor with 5V
output (preferred) or a power supply

2. Verify that the red and green LED flashes once, respectively, – the P9235A-R-EVK board is up and running now

3. Place the P9027LP-R-EVK board on top of the P9235A-R-EVK board with the coil of the P9027LP-R-EVK facing down and
centered on the coil of the P9235A-R-EVK board. The green LED on the P9027LP-R-EVK board indicates that it has been
successfully powered up.

4. Optional: Solder two 28-gauge wires to the OUT and GND pins on P9027LP-R-EVK board. Connect these two wires to an
electronic load.

5. Set the electronic load current to zero initially and then gradually increase the load current up to 400mA with the attached 2W
coils

Output Power

The output of the P9027LP-R-EVK’s LDO regulator has a plated via labeled OUT, and the DC ground return path is labeled GND. The output
provides a nominal 5.0 V with 400mA output current capability using the attached 20mm diameter coil. When switched to the 30mm diameter
coil (supplied in the kit), it can provide up to 600mA output current. The plated vias have a 15 mil diameter, allowing for 28-gauge wire or
smaller.

P9027LP-R Board LED Power Indicator

The P9027LP-R-EVK is equipped with a single green LED power indicator connected from OUT to ACTB. This LED will be illuminated when
the system reaches the desired operating point and enables the DC voltage output. This LED is entirely optional and is included for evaluation
purposes only. When illuminated, it draws less than 1 mA of current from the output. If desired, the brightness of the LED can be increased by
lowering the value of resistor R3.

P9027LP-R Board Test Point Accessibility

The P9027LP-R-EVK reference board was designed so that the core layout could be easily “dropped-in” to an existing system board design.
For this reason, all of the necessary inputs and outputs are placed toward the edge of the board to eliminate uncertainty in escape routing.
For more information about copying the digital layout files, refer to application note AN-933.

When prototyping with this board, it is important to use a low-resistance wire that is rated for the expected output current. This will avoid
damage to the wire and minimize voltage drops on its way to the load.

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© 2016 Integrated Device Technology, Inc 5 May 16, 2016

45.00

50.00

55.00

60.00

65.00

70.00

75.00

80.00

85.00

60 120 180 240 300 360 420 480 540 600

Efficiency (%)

Iout (mA)

Vin=5V, Vout=5V, Iout=600mA, Tx=P9235A-R, Tx coil=760308101103, Spacer=1.5mm,

Rx coil=760308102213, Rx=P9027LP-R, No air flow, Room temperature

Coil Spacer (Upside-down Coil)

A good wireless power transfer system should maintain a small separation gap between the transmitter coil and the receiver coil. For the
reference board, the receiver coil has been mounted upside-down on the P9027LP-R-EVK board. The PCB area under the Rx coil is used as
a spacer (0.5mm) to simulate the thickness of a wearable device case, and there is no copper conductor. While the coil itself is protected by
non-conductive encapsulation, it is recommended to use some type of spacer to achieve optimal power transfer efficiency.

Similarly a 0.8mm plastic spacer is placed on top of the Tx coil to simulate the casing of a final transmitter product. With both spacers the total
distance between the coils is about 1.5mm.

Separating the Coil from the Spacer

The P9027LP-R-EVK reference board has been precisely tuned for the stock coil attached to the board. The PCB has been designed with a
score line enabling users to snap-off of the active PCB section. When doing so, carefully peel the coil off from the Rx PCB. Once the coil is off,
it is recommended to use scissors to cut the active board area along the score lines. To see a video demonstration, visit:

www.IDT.com/WP3W-RK.

If it is necessary to extend the length of the coil leads when working on prototype, it’s best to unsolder them from the PCB prior to separating
the active PCB area from the rest of the board.

Performance Characteristics

Figure 5. Typical Efficiency Curve for 30mm Coil

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© 2016 Integrated Device Technology, Inc 6 May 16, 2016

-0.5

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0 60 120 180 240 300 360 420 480 540 600

Loasd Regulation (%)

Iout (mA)

Vin=5V, Vout=5V, Iout=600mA, Tx=P9235A-R, Tx coil=760308101103, Spacer=1.5mm,

Rx coil=760308102213, Rx=P9027LP-R, No air flow, Room temperature

25.00

30.00

35.00

40.00

45.00

50.00

55.00

60.00

65.00

70.00

75.00

40 80 120 160 200 240 280 320 360 400

Efficiency (%)

Iout (mA)

Vin=5V, Vout=5V, Iout=400mA, Tx=P9235A-R, Tx coil=760308101104, Spacer=1.5mm,

Rx coil=760308101220, Rx=P9027LP-R, No air flow, Room temperature

Figure 6. Load Regulation for 30mm Coil

Figure 7. Typical Efficiency Curve for 20mm Coil

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc 7 May 16, 2016

P9235A-R: 39.2 Degree C

Coil: 45.9 Degree C

P9027LP-R: 40.5 Degree C

-0.5

-0.4

-0.3

-0.2

-0.1

0

0.1

0.2

0.3

0.4

0.5

0 40 80 120 160 200 240 280 320 360 400

Loasd Regulation (%)

Iout (mA)

Vin=5V, Vout=5V, Iout=400mA, Tx=P9235A-R, Tx coil=760308101104, Spacer=1.5mm,

Rx coil=760308101220, Rx=P9027LP-R, No air flow, Room temperature

Figure 8. Load Regulation for 20mm Coil

Figure 9. 5V/400mA Thermal Images Using 20mm Coil

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc 8 May 16, 2016

Figure 10. 0 to 400mA Step Load Response (Ch1=Vrect, Ch2=VSNS, Ch3=Vout, Ch4=Iout)

Figure 11. No Load Start-up by Tx Input Power (Ch1=Vrect, Ch2=VIN, Ch3=Vout,Ch4=Iout)

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc 9 May 16, 2016

Figure 12. 600mA Full Load Start-up by Tx Input Power (Ch1=Vrect, Ch2=VIN, Ch3=Vout,Ch4=Iout)

Figure 13. No Load Start-up by Rx Enable Signal (Ch2=EN, Ch3=Vout, Ch4=Iout)

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Figure 14. 600mA Full Load Start-up by Rx Enable Signal (Ch2=EN, Ch3=Vout, Ch4=Iout)

Figure 15. Rx Over Temperature Protection (Ch1=Vrect, Ch2=Vin, Ch3=Vout, Ch4=INT)

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Figure 16. Rx Over Current Protection (Ch1=Vrect, Ch2=Iout, Ch3=Vout, Ch4=INT)

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P9027LP-R-EVK Schematic

Figure 17. P9027-R-EVK Board Schematic

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P9027LP-R-EVK Component Map and Bill-of-Materials (BOM)

Figure 18. P9027LP-R-EVK Component Map

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Item

Qty.

Reference

Description

PCB Footprint

MFG Part Number

1 4 C1, C2,C6,C7

CAP 10uF/10V

402

CL05A106MP5NUNC

2 2 *C5, *C8

RES 0.0 OHM

402

ERJ-2GE0R00X

3 1 C4

CAP 1UF/25V

402

C1005X5R1E105M050BC

4 1 C3

CAP 0.047UF/25V

402

C1005X7R1E473M050BC

5 1 C9

CAP 1800PF/50V

402

GRM155R71H182KA01D

6 2 *R1,*R2

RES 5.11k

201

ERJ-1GEF5111C

7 1 *R3

RES 680

402

ERJ-2GEJ681X

8 1 R4

RES 5.1k

402

ERJ-2GEJ512X

9 2 *R5, *R9

RES 0.0 OHM

201

ERJ-1GE0R00C

10 2 R6, R7

RES 4.99K

201

ERJ-1GEF4991C

11 1 R8

RES 1.13K

201

ERJ-1GEF1131C

12 1 R10

RES 7.87K

201

ERJ-1GEF7871C

13 2 *R11,*R15

RES 2.49K

402

ERJ-2RKF2491X

14 1 R12

RES 1.69K

201

ERJ-1GEF1691C

15 2 *R13, *R14

Potential meter 10k

2.2mmX2.1mmx0.8mm

PVA2A103A01R00

16 1 *D1

LED Indicator

402

LED RED 0402 SMD

17 1 U1

Wireless Power Rx IC

2.24x3.62mm WLCSP,

0.4mm pitch size

P9027LP-R

18 1 See Table 2 for inductance value

Rx coil

See Table 2 for part numbers

Table 1: P9027LP-R-EVK Bill-of-Materials

*Components are optional depending on application.

A standard bill-of-materials (BOM) spreadsheet can be found at www.IDT.com/WP3W-RK .

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Output Power

Vendor

Part Number

Inductance

DCR

Dimension

1 W

TDK

WR121220-27M8-ID

8.32 uH

0.98 Ω

Ø12 mm

SunLord

SWA12R12H08C01B

8.50 uH

0.38 Ω

Ø12 mm

2W
TDK

WR202010-18M8-ID3

11.0 µH

0.40 Ω

Ø20 mm

Wurth Electronics

760308101220

12.60 µH

0.27 Ω

Ø17 mm

SunLord

SWA20R20H08C01B

12.0 µH

0.29 Ω

20 mm x 20 mm

3 W
TDK

WR303050-12F5-ID1

8.20 µH

0.30 Ω

30 mm x 30 mm

Wurth Electronics

760308102213

7.90 µH

0.26 Ω

29 mm x 29 mm

SunLord

SWA30R30H08C01B

8.20 uH

0.33 Ω

30 mm x 30 mm

Table 2: Rx Coil Specification and Part Numbers

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P9027LP-R-EVK Layout

Figure 19. P9027LP-R-EVK Layout (Top Layer)

Figure 20. P9027LP-R-EVK Layout (Inner Layer 1)

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Figure 21. P9027LP-R-EVK Layout (Inner Layer 2)

Figure 22. P9027LP-R-EVK Layout (Bottom Layer)

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc

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P9235A-R-EVK Schematic

Figure 23. P9235A-R-EVK Board Schematic

WP3W-RK Reference Kit Manual

© 2016 Integrated Device Technology, Inc

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P9235A-R-EVK Component Map and Bill-of-Materials (BOM)

Figure 24. P9235A-R-EVK Component Map

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© 2016 Integrated Device Technology, Inc

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Item

Qty

Reference

Description

PCB Footprint

MFG Part Number

1 3 C1,C24,C33

22nF/50V

0402

C0402C223K5RACTU

2 1 C2

1uF/10V

0402

C0402C105M8PACTU

3 2 C3,C4

220pF/50V

0402

CL05B221KB5NNNC

4 1 C5

5.6nF/50V

0402

CL05B562KB5NNNC

5 1 C6

6.8nF/50V

0402

CL05B682JB5NNNC

6 5 C9,C12,C13,C18,C31

0.1uF/25V

0402

TMK105BJ104KV-F

7 1 C8

10uF/10V

0402

CL05A106MP5NUNC

8 5 C10,C11,C19,C21,C30

10uF/25V

0603

CL10A106MA8NRNC

9 4 C7,C14,C27,C29

1uF/10V

0402

CL05A105KP5NNNC

10 4 C15,C17,C23,C25

100nF/50V

1206

C3216C0G1H104J160AA

11 2 C16,C26

100nF

0402

C1005X6S1V104K050BB

12 3 C20,C34,C28

0.1uF/10V

0402

C0402C104K8RACTU

13 4 C22,C32,C35,C36

NP

0402

14 1 D1

DIODE

SOD523PD

CMOD3003

15 1 D2

Red LED

0603_diode

150 060 RS7 500 0

16 1 D3

Green LED

0603_diode

150 060 GS7 500 0

17 1 J1

5P

USB_micro_ab

10104111-0001LF

18 1 L1

4.7uH

0603

CIG10W4R7MNC

19 1 L2

See Table 3 for coil specification

Tx coil

See Table 3 for coil part numbers

20 1 Q1

80mOhm/4.5V

SOT23-6

FDC654P

21 2 Q2,Q3

20mOhm/6A Dual
N-Channel MOSFETs

DFN3mmX3mm

AON7810

22 1 R1

10K %1

0402

RCG040210K0FKED

23 1 R20

10k

0402

CRCW040210K0JNED

24 3 R2,R8,R22

1k

0402

RC0402FR-071KL

25 1 R3

220k

0402

RC0402FR-07220KL

21 2 R4,R5

10

0402

RT0402DRE0710RL

27 1 R6

0.02

0603

WSL0805R0200FEA

28 1 RT1

THERMISTOR

0603

ERT-J1VG103FA

29 4 R9,R12,R14,R16

12

0402

ERJ-2GEJ120X

30 6 R10,R15,R24,R25,R26,R27

NP

0402

Table 3: P9235A-R-EVK BOM

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Item

Qty

Reference

Description

PCB Footprint

MFG Part Number

31 2 R11,R18

0 OHMS RESISTOR

0402

RC0402JR-070RL

32 3 R7,R13,R19

100k

0402

ERJ-2GEJ104X

33 1 R17

5.1k

0402

MCR01MRTJ512

34 1 R21

100

0402

RC0402JR-07100RL

35 1 R23

680

0402

RC0402JR-07680RL

36 4 R28,R29,R30,R31

47k

0402

ERJ-2GEJ473X

37 1 U1

Wireless Power Tx IC

QFN_40ld_5x5m

P9235A-R

Output

Power

Vendor

Part number

Inductance

DCR

Dimension

1W

TDK

WT151512-22F2-ID

6.49 uH

0.17 Ω

Ø15 mm

SunLord

SWA15T15H20C01B

6.30 uH

0.12 Ω

Ø15 mm

2W

TDK

WT202012-15F2-ID

6.20 uH

0.10 Ω

Ø20 mm

Wurth Electronics

760308101104

6.30 uH

0.11 Ω

Ø20 mm

SunLord

SWA20N20H20C01B

6.30 uH

0.15 Ω

Ø20 mm

3W

TDK

WT303012-13F2-ID

6.30 uH

0.12 Ω

Ø30 mm

Wurth Electronics

760308101103

6.50 uH

0.15 Ω

Ø30 mm

SunLord

SWA30N30H20C01B

6.25 uH

0.14 Ω

Ø30 mm

*Components are optional depending on application.

A standard bill-of-materials (BOM) spreadsheet can be found at www.IDT.com/WP3W-RK.

Table 4: Tx Coil Specification and Part Numbers

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P9235A-R-EVK Layout

Figure 25. P9235A-R-EVK Layout (Top Layer)

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Figure 26. P9235A-R-EVK Layout (Bottom Layer)

Corporate Headquarters

6024 Silver Creek Valley Road
San Jose, CA 95138

www.IDT.com

Sales

1-800-345-7015 or 408-284-8200
Fax: [phone]

www.IDT.com/go/sales

Tech Support

www.IDT.com/go/support

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© 2016 Integrated Device Technology, Inc

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Orderable Part Number

Package

Shipping Packaging

WP3W-RK

Reference Kit

Box

Revision Date

Description of Change

May 16, 2016

Initial release.

Ordering Information

Revision History

DISCLAIMER Integrated Devic e Technology, Inc. (IDT) reserves the right to modify the products and/or specifications described herein at any time, without notice, at IDT's sole discreti on. Performance specificati ons and
operating parameters of the described products are determined in an independent state and are not guaranteed to perform the same way wh en installed in customer products. The information c ontained herein is provided
without representation or warranty of any kind, whe ther express or implied, including, but not limited to, the suitability of IDT's products for any particular purpose, an impl ied warranty of m erchantability, or non-infringement of
the intellectual property rights of others. This document is presented only as a guide and does not convey any license under intellectual property rights of IDT or any third parties.

IDT's products are not intended for use in applications involving extreme environmental conditions or in life support systems or similar devices where the fail ure or malfunction of an IDT product can be reasonably expected to
significantly affect the health or safety of users. A nyone using an IDT product in such a manner does so at their own risk, a bsent an express, written agreement by IDT.

Integrated Device Technology, IDT and the IDT logo are trademarks or registered trademarks of IDT and its subsidiaries in the United States and other countries. O ther trademarks used herein are the property of IDT or their
respective third party owners. For datasheet type definitions and a gl ossary of common terms, visit www.idt.com/go/glossary . All contents of this document are copyright of Integrated Device Technology, Inc. All rights
reserved.

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