Linear Analog Devices LTC4124 Demo Manual
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Linear Analog Devices LTC4124 Demo Manual

50ma wireless li-ion charger demonstration kit
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LTC4124/LTC4125, 50mA Wireless Li-Ion Charger
DESCRIPTION
DC2770A-A-KIT is a kit of the DC2773A-A transmitter
board (featuring
LTC
4125) and the DC2775A-C (fea-
®
turing
LTC
4124). The DC2775A-C receiver board can
®
charge a single Li-Ion battery at up to 50 mA with an
air gap of 3.0 mm to 5.0 mm between the transmit and
CONTENTS
1 × DC2773A-A (LTC4125) Transmitter Demo Board
1 × DC2775A-C (LTC4124) Receiver Demo Board
PERFORMANCE SUMMARY
SYMBOL
PARAMETER
V
DC2773A-A Voltage Input
IN
I
DC2773A-A V
Current
IN
IN
V
DC2775A-C Battery Charge Voltage
BAT
I
DC2775A-C Charge Current
BAT
AIR-GAP
Separation Between L
f
DC2773A-A Resonant Tank Frequency
TX_TANK
f
DC2775A-C Resonant Tank Frequency
RX_TANK
BOARD PHOTO
Figure 1. DC2773A-A Picture
CONDITIONS
I
≤ 500mA
VIN
V
= 5V
IN
V
SEL1
V
SEL1
V
SEL1
V
SEL1
V
BAT
and L
Coils
TX
RX
DEMO MANUAL DC2770A-A-KIT
receive coils. The DC2773A-A transmitter board supports
Foreign Object Detection via the LTC4125.
Design files for this circuit board are
All registered trademarks and trademarks are the property of their respective owners.
= HI, V
= HI
SEL2
= HI, V
= LO
SEL2
= LO, V
= HI
SEL2
= LO, V
= LO
SEL2
= 4.0V, I
= V
, I
= GND
SEL1
CC
SEL2
Figure 2. DC2775A-C Picture
Demonstration Kit
available.
MIN
TYP
MAX
4.5
5.5
500
4.35
4.20
4.1
4.00
50
3
3.5
200
200
UNITS
V
mA
V
V
V
V
mA
5
mm
kHz
kHz
Rev. 0
1

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Summary of Contents for Linear Analog Devices LTC4124

  • Page 1 DEMO MANUAL DC2770A-A-KIT LTC4124/LTC4125, 50mA Wireless Li-Ion Charger Demonstration Kit DESCRIPTION DC2770A-A-KIT is a kit of the DC2773A-A transmitter receive coils. The DC2773A-A transmitter board supports board (featuring 4125) and the DC2775A-C (fea- Foreign Object Detection via the LTC4125. ® turing 4124).

  • Page 2: Quick Start Procedure

    DEMO MANUAL DC2770A-A-KIT QUICK START PROCEDURE Refer to Figures 3, 4, and 5 for the proper measurement maximum battery charging current, the power supply equipment setup, DC2775A-C mounting on DC2773A-A, only sources current even when the battery charge cur- and follow the procedure below: rent is at its maximum value.

  • Page 3: Test Setup

    DEMO MANUAL DC2770A-A-KIT TEST SETUP Battery Emulator – RBAT1 3.7V DC 0.5A – Figure 4. DC2775A-C Top 4.5–5.5V Supply 0.5A – Figure 5. DC2773A-A Top Rev. 0...
  • Page 4 DEMO MANUAL DC2770A-A-KIT TEST SETUP Figure 6. Measuring Input or Output Ripple NOTE: All connections from equipment should be Kelvin connected directly to the board pins which they are connected on this diagram and any input or output leads should be twisted pair. Rev.

  • Page 5: Theory Of Operation

    This DC source is then fed into the To check the operation details of optimum power search, internal linear battery charger to charge a Li-Ion battery. please refer to DC2770A-B-KIT demo manual. As shown in Figure 8, when the LTC4124 receives more...
  • Page 6 DEMO MANUAL DC2770A-A-KIT THEORY OF OPERATION tank to ground. In this way, the linear charger is highly efficient as its input is always kept just above the battery 2V/DIV voltage, V 2V/DIV The LTC4124 includes a full featured CC/CV (Constant...

  • Page 7: Parts List

    DEMO MANUAL DC2770A-A-KIT PARTS LIST ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER DC2773A-A: Required Circuit Components C1, C2, C3 CAP ., 100uF , X5R, 6.3V, 10%, 1206 MURATA, GRM31CR60J107KE39L CAP ., 0.01uF , X7R, 50V, 10%, 0402 KEMET, C0402C103K5RAC7867 CAP ., 0.01uF , X7R, 25V, 10%, 0402, AEC-Q200 MURATA, GCM155R71E103KA37D CAP ., 4700pF, X7R, 50V, 10%, 0402 AVX, 04025C472KAT2A...
  • Page 8 DEMO MANUAL DC2770A-A-KIT ITEM REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER R13, R45 RES., 0 OHM, 1/16W, 0402 NIC, NRC04ZOTRF RES., 10k OHMS, 5%, 1/16W, 0402 YAGEO, RC0402JR-0710KL R20, R33 RES., 430 OHMS, 5%, 1/16W, 0402 YAGEO, RC0402JR-07430RL RES., 15.4k OHMS, 1%, 1/16W, 0402, AEC-Q200 KOA SPEER, RK73H1ETTP1542F RES., 27.4k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040227K4FKED...

  • Page 9: Schematic Diagram

    DEMO MANUAL DC2770A-A-KIT SCHEMATIC DIAGRAM Rev. 0...
  • Page 10 DEMO MANUAL DC2770A-A-KIT SCHEMATIC DIAGRAM Rev. 0...
  • Page 11 DEMO MANUAL DC2770A-A-KIT SCHEMATIC DIAGRAM Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice.
  • Page 12 DEMO MANUAL DC2770A-A-KIT ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. Legal Terms and Conditions By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern.

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