LINER LTC4120EUD Wireless power receiver and 400ma buck battery charger Datasheet

DEMO MANUAL
DC2181A-A/B
LTC4120EUD
Wireless Power Receiver
and 400mA Buck Battery Charger
Description
Demonstration circuit 2181 is an LTC®4120EUD demonstration board. The DC2181 is used with the DC1968A
wireless power transmitter or the PowerByProxi ProxiPoint
transmitter (both available separately). Either can deliver
2W to the DC2181, with up to 10mm spacing between
the transmitter and the receive coil. The basic transmitter
doesn’t support foreign metal object detection. Transmitters
available separately. See last page for details.
FEATURED PART
DC2181A-A
LTC4120EUD-4.2 (Fixed Output)
DC2181A-B
LTC4120EUD (Adjustable Output)
Design files for this circuit board are available at
http://www.linear.com/demo/DC2181A
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Performance Summary
Specifications are at TA = 25°C
SYMBOL
PARAMETER
CONDITIONS
HVIN
DC1968A High Voltage Input Voltage Range
IHVIN ≤ 500mA at HVIN = 8V
VCC
DC1968A VCC Input Range
IVCC = 0 ~ 700mA
V(BAT)
DC2181A BAT Pin Voltage
R9 = 1.40MΩ, R10 = 1.05MΩ
2.5
I(BAT)
DC2181A BAT Pin Current
V(BAT) = 3.7V, DC1967A(R5) = 3.01kΩ, All Bar
Graph LEDs on.
370
MIN
TYP
MAX
UNITS
8
38
V
4.75
5.25
V
380
4.25
V
390
mA
Board Photo
OR
OR
Figure 1. DC2181 Wireless Power Receiver Demo Board
NOTE: These boards
are not included with
DC2181 and must be
ordered separately.
See last page for details.
Figure 2. DC1968A Wireless Power Basic Transmitter Demo Board
Figure 3. PowerByProxi ProxiPoint Transmitter
dc2181afb
1
DEMO MANUAL
DC2181A-A/B
Assembly Test Procedure
For the proper measurement equipment setup and jumper
settings refer to Figure 6a, if you are using the DC1968A
wireless power basic transmitter, or Figure 5a, if you are
using the PowerByProxi ProxiPoint transmitter. Please follow the checkout procedure, below, to familiarize yourself
with the DC2181 demo board.
NOTE: When measuring the input or output voltage
ripple, care must be taken to avoid a long ground lead
on the oscilloscope probe. Measure the input or output
voltage ripple by touching the probe tip directly across
the VCC or VIN and GND terminals. See Figure 4 for
proper scope probe technique.
1. Connect power to the transmitter. For the DC1968A
basic transmitter set PS1 to 5V, and turn on. For the
PowerByProxi ProxiPoint transmitter, plug in the
power supply that came with the transmitter.
2. Set PS2 to 3.6V, and turn the supply on. PS2 is the
battery emulator battery voltage. The purpose of the
3.6Ω is to make PS2 into a bipolar supply. Most power
supplies can only source current not sink current, bipolar
supplies can do both. A bipolar supply is necessary for a
battery emulator, as it must absorb the current coming
from the charger. By placing a 3.6Ω resistor in parallel
with a normal supply, the supply can absorb up to 1A,
at 3.6V.
3. Place the DC2181A receive board on the transmitter as
shown in Figure 5c, if you are using the PowerByProxi
ProxiPoint transmitter. Or as shown in Figure 6c, if
using the DC1968A. Note: for the ProxiPoint transmitter, the LED the ProxiPoint transmitter should change
from green to solid red. If the LED turns blinking red,
please remove the DC2181A board, wait until the LED
turns green, and once again place the DC2181 on the
transmitter. If the ProxiPoint transmitter LED does not
change to solid red on the second try, please contact
your FAE.
4. The green bar graph LEDs on the DC2181 demo board
should light. Observe AM1, there is an additional 10mA
flowing from the BAT into the bar graph LEDs. Please
ensure that VM1 measures less than 4V. If not lower
PS2 until it does.
The bar graph LEDs indicate the percent of programmed
charge current flowing into the battery. They do so by
monitoring the PROG voltage. PROG will be 1V, at full
programmed charge current.
If you lower the battery emulator voltage, by lowering
PS2, until VM1 reads approximately 2.9V, you will see
the bar graph drop to 10%. This is the trickle current,
which is set to 10% of the programmed charge current.
5. Test is complete.
Figure 4. Proper Measurement Technique for Measuring Ripple
2
dc2181afb
DEMO MANUAL
DC2181A-A/B
Assembly Test Procedure
PS1
–
3.6V POWER SUPPLY
1A
–
3.6Ω
+
VM1
+
AM1
A
–
V
+
Figure 5a. DC2181A-A/B Wireless Power Demo Board Connection
Figure 5b. PowerByProxi’s ProxiPoint Transmitter
Figure 5c. DC2181A-A/B Wireless Power Demo Board Mounted on PowerByProxi’s ProxiPoint Transmitter
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.
dc2181afb
3
DEMO MANUAL
DC2181A-A/B
Assembly Test Procedure
–
PS2
3.6V BIPOLAR SUPPLY
+
1A
–
3.6Ω
VM1
+
AM1
A
–
V
+
Figure 6a. DC2181A-A/B Wireless Power Demo Board Connection
PS1
+
5V POWER SUPPLY
1A
–
Figure 6b. DC1968A Wireless Power Basic Transmitter Connection
Figure 6c. DC2181A-A/B Wireless Power Demo Board Mounted on
DC1968A Wireless Power Basic Transmitter
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.
4
dc2181afb
DEMO MANUAL
DC2181A-A/B
Theory of Operation
The DC2181A demo board demonstrates operation of a
double tuned magnetically coupled resonant power transfer
circuit. The DC2181A demo Board must be used in conjunction with either the DC1968A wireless power basic
transmitter or the PowerByProxi ProxiPoint transmitter.
For theory of operation of the PowerByProxi ProxiPoint
transmitter, please refer to the ProxiPoint documentation.
DC1968A – Basic Transmitter
The DC1968A basic transmitter is used to transmit wireless power and is used in conjunction with the DC2181A
wireless power receiver board featuring the LTC4120.
The DC1968A is configured as a current fed astable multivibrator, with oscillation frequency set by a resonant tank.
The DC1968A basic transmitter is set to 130kHz operation
and the DC1967A LTC4120 demonstration board resonant
frequency is 127kHz with DHC enabled and 140kHz with
DHC disabled. For the DC1968A basic transmitter the
resonant components are the 2X 0.15µF PPE film capacitors (Cx1 and Cx2) and the 5.0µH (Lx) transmit coil (see
Schematic: Basic Inductive Transmitter with PreRegulator). This gives a resonant frequency of 129.95kHz.
The tolerance on the transmit coil and resonant capacitors
is ±2%, or 2.6kHz. Inductors L1 and L2 are used to make
the resonant structure current fed.
The current fed topology makes the peak-to-peak voltage
on the resonant tank equal to 2πVCC. VCC is 5V, so the
peak-to-peak tank voltage is 31.5V, see Figure 7.
The blue and green traces are the drains of the transmitter MOSFETs M1 and M2 (see Schematic: Basic Inductive
Transmitter with Pre-Regulator), respectively. The red
trace is the difference (VCX – VCY) of those two nodes,
and shows that the resonant tank is producing a sine
wave. The peak-to-peak voltage of 2πVCC = 31.5V, results
from the current fed topology. This in turn determines
the breakdown of the MOSFETs and diodes D2 and D3.
To increase transmit power by raising VCC, you must also
change M1, M2, D2 and D3, to reflect the higher voltages
on the CX and CY nodes.
The magnitude of the magnetic field is directly proportional
to the current in the transmit coil. For a resonant system
this current is Q times the input current. So the higher the
Q the larger the magnetic field. Therefore the transmit coil
is constructed with Litz wire, and the resonant capacitors
are very low dissipation PPS film capacitors. This leads
to a Q of approximately 10 at 130kHz, and a circulating
current of approximately 6AP-P, at full load.
DC2181 – Wireless Power Receiver Board Featuring
the LTC4120
The DC2181 LTC4120 wireless power receiver IC implements dynamic harmonization control (DHC), which tunes
or detunes the receive circuit to receive more or less
power as needed. The primary receive tank is composed
of AE1, and C2S, although it must be noted that C2S is AC
grounded through C5, the LTC4120 decoupling capacitor,
to be in parallel with AE1. C2S also serves to tap power
off the resonant circuit and send it to the LTC4120, (see
Schematic: 400mA Wireless Synchronous Buck Battery
Charger).
VCx-Cy
20V/DIV
VCx
10V/DIV
VCy
10V/DIV
2µs/DIV
DC2181A F07
Figure 7. DC1968A Basic Transmitter
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5
DEMO MANUAL
DC2181A-A/B
Theory of Operation
The waveforms in Figure 8 were captured at a transmitto-receive gap of 8mm. The blue trace is the waveform at
the CX pin of the receiver board (see Schematic: 400mA
Wireless Synchronous Buck Battery Charger), and the
red trace is the charge current into the battery. Although
the transmit waveform is a sine wave, the series-parallel
connection of the secondary resonant circuit does not
yield a sine wave, and this waveform is correct. The charge
current into the battery has an average of ≈ 400mA, for a
delivered power of 1.5W (VBAT = 3.7V). However, 10mA
has been diverted to the charge LEDs, for a net battery
charge current of 390mA. The ripple on the charge current
is synchronous to the transmit waveform.
IBAT
VBAT = 3.7V
100µA/DIV
Summary
The LTC4120 wireless power receiver IC adjusts the
receiver resonant frequency to keep the system from
transferring too much power when the coupling is high
between transmit and receive coils. The LTC4120 wireless
power receiver IC increases power transfer when power
transfer is insufficient. This is accomplished by switching
capacitors into the resonant circuit using the DHC pin. This
gives a much wider operating transmit distance.
Figure 9 shows VIN to the LTC4120 and the battery charge
current. The blue trace is the charge current into the battery, and the red trace is the voltage at VIN on the receiver
board. VIN is about 25V, while the LTC4120 delivers 1.5W
at a distance of 8mm, to the battery. There is negligible
transmit frequency ripple on VIN, and the voltage is well
above the 14V DHC voltage. This indicates that the input
rectifiers are operating in peak detect mode, and that DHC
is inactive.
Cx TO GND
20V/DIV
2µs/DIV
DC2181A F08
Figure 8. DC2181A Receiver Board
DHC
When VIN is above 14V, the DHC pin is open and C2P
doesn’t enhance the energy transfer; this is the detuned
state, and the resonant frequency of the receive tank is
142kHz. When VIN falls below 14V, the DHC pin is grounded
putting C2P in parallel with both C2S and AE1 thus changing the resonant frequency to 127.4kHz. When the receiver
is tuned at 127.4kHz and drawing significant power, the
transmit frequency is pulled down to 127kHz. So, at full
power the system is now a double-tuned resonant circuit.
Figure 10 shows approximate power transfer vs distance
between transmitter and receiver. Note the minimum
clearance. The minimum is needed to avoid exceeding
the maximum input voltage.
6
VIN TO GND
5V/DIV
IBAT
100mA/DIV
VBAT = 3.7V
2µs/DIV
DC2181A F09
Figure 9. DC2181A Receiver
dc2181afb
DEMO MANUAL
DC2181A-A/B
Theory of Operation
AE1, the Receive Antenna
The manufacturers can be contacted at:
One of the main differences between the DC1967A and the
DC2181 demo boards, is that the wireless power receive
antenna is separate for the DC2181 demo board.
Inter-Technical
www.inter-technical.com, search for LTC4120
TDK
www.tdk.components.com
Würth
http://katalog.we-online.de/pbs/
datasheet/760308101303.pdf
Several antennas were tested, with the criteria of passing 2.5W at 8mm spacing. The following table lists the
antennas that passed successfully:
MANUFACTURER
CONSTRUCTION
MFG PART NUMBER
TDK
Ferrite on PCB
B67410-A0223-X195
Inter-Technical
Ferrite on PCB
L41200R01
Inter-Technical
Ferrite on PCB
L41200R02*
Inter-Technical
Litz on Ferrite
L41200R03
Inter-Technical
Litz on Ferrite
L41200R04
Inter-Technical
Ferrite on PCB
L41200R05
TDK
Wire on Ferrite
WR282830-37M8-LR4
Würth
Wire on Ferrite
760308101303
AE1 is physically mounted with double sided tape, as well
as the electrical connection pins. Removing AE1 is likely
to damage the ferrite on the backside of the antenna. Only
remove AE1 when you have the a suitable replacement
at hand.
*AE1 wireless power receive antenna shipped with DC2181
½ Power
±1mm
½ Power
Envelope
Full Power
Envelope
Full Power
±1mm
DC1967A-B with
25mm Receive
Antenna
9mm
8mm
7mm
6mm
17mm
5mm
4mm
13mm
3mm
18mm
2mm
15mm
1mm Minimum Clearance
Transmit Antenna
DC2181A F10
Figure 10. Power Transfer vs Axial Distance and Misalignment
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7
DEMO MANUAL
DC2181A-A/B
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2181A General Bill of Materials
DC2181A Required Circuit Components
1
1
AE1
RECEIVE ANTENNA
INTER-TECHNICAL, L41200R02
2
2
C2S1, C2P1
CAP, CHIP, C0G, 0.0047μF, ±5%, 50V, 0805
MURATA, GRM2165C1H472JA01D
3
1
C2P2
CAP, CHIP, C0G, 0.0018μF, ±5%, 50V, 0603
KEMET, C0603C182J5GAC7533
4
1
C2S2
CAP, CHIP, C0G, 0.022μF, ±5%, 50V, 0805
MURATA, GRM21B5C1H223JA01L
5
1
C1
CAP, CHIP, X5R, 10μF, ±20%, 16V, 0805
TDK, C2012X5R1C106K
6
1
C2
CAP, CHIP, X5R, 47μF, ±10%, 16V, 1210
MURATA, GRM32ER61C476KE15L
7
1
C3
CAP, CHIP, X7R, 0.01μF, ±10%, 50V, 0603
TDK, C1608X7R1H103K
8
1
C4
CAP, CHIP, X5R, 2.2μF, ±20%, 6.3V, 0402
MURATA, GRM155R60J225ME15D
9
1
C5
CAP, CHIP, X7S, 10μF, ±20%, 50V, 1210
TDK, C3225X7S1H106M
10
3
D1, D2, D3
DIODE, SCHOTTKY, 40V, 2A, PowerDI123
DIODES, DFLS240L-7
11
1
L1
IND, SMT,15μH, 260mΩ, ±20%, 0.86A, 4mm × 4mm
COILCRAFT, LPS4018-153ML
12
1
R1
RES, CHIP, 1.40M, ±1%, 1/16W, 0402
VISHAY, CRCW04021M40FKED
13
1
R2
RES, CHIP, 412kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW0402412KFKED
14
2
R3, R7
RES, CHIP, 10kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW040210K0FKED
15
1
R5
RES, CHIP, 3.01kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW04023K01FKED
16
1
R36
RES, CHIP, 0Ω JUMPER, 1/16W, 0402
VISHAY, CRCW04020000Z0ED
Additional Demo Board Circuit Components
1
3
C6, C8, C9
CAP, CHIP, X7R, 0.01μF, ±10%, 25V, 0402
TDK, C1005X7R1E103K
2
2
C7, C10
CAP, CHIP, X5R, 1μF, ±10%, 16V, 0402
TDK, C1005X5R1C105K
3
1
D4
DIODE, ZENER, 39V, ±5%, 1W, PowerDI123
DIODES, DFLZ39
4
8
D5, D6, D7, D8, D9, D10, DIODE, LED, GREEN, 0603
D11, D12
LITE-ON, LTST-C193KGKT-5A
5
1
R4
RES, CHIP, 2kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04022K00JNED
6
2
R11, R12
RES, CHIP, 100kΩ, ±5%,1/16W, 0402
VISHAY, CRCW0402100KJNED
7
1
R13
RES, CHIP, 10kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW040210K0JNED
8
2
R14, R35
RES, CHIP, 432Ω, ±1%, 1/16W, 0402
VISHAY, CRCW0402432RFKED
9
2
R15, R33
RES, CHIP, 22.6kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW040222K6FKED
10
1
R16
RES, CHIP, 34.8kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW040234K8FKED
11
7
R17, R18, R19, R20,
R21, R22, R23
RES, CHIP, 100kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW0402100KFKED
12
1
R24
RES, CHIP, 49.9kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW040249K9FKED
13
8
R25 TO R32
RES, CHIP, 1kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04021K00JNED
14
1
R34
RES, CHIP, 787kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW0402787KFKED
15
2
R6, R38
RES, CHIP, 0Ω JUMPER, 1/16W, 0402
VISHAY, CRCW04020000Z0ED
16
0
R8-OPT, R37-OPT
RES, CHIP, 0Ω JUMPER, 1/16W, 0402
VISHAY, CRCW04020000Z0ED
17
2
U2, U3
ULTRALOW POWER QUAD COMPARATORS WITH
REFERENCE, 5mm × 4mm DFN16
LINEAR TECHNOLOGY, LTC1445CDHD
8
dc2181afb
DEMO MANUAL
DC2181A-A/B
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
Hardware: For Demo Board Only
1
4
E3, E4, E7, E8
TURRET, 0.091˝
MILL-MAX, 2501-2-00-80-00-00-07-0
2
4
E1, E2, E5, E6
TURRET, 0.061˝
MILL-MAX, 2308-2-00-80-00-00-07-0
3
2
J1, J2
HEADER, 1PIN, 0.020˝ × 0.020˝
SAMTEC, TMM-101-02-L-S
4
0
J3-OPT
CONN, 3 PIN POLARIZED
HIROSE, DF3-3P-2DSA
5
2
BP1, BP2, BP3, BP4
CLEAR 0.200˝ × 0.440˝ BUMPER
KEYSTONE, 785-C
6
0.00058
7
4
ITEM
QTY
3M, 0.5IN WIDE, 1/16IN THICK, DOUBLE SIDED FOAM 3M, 4466
TAPE, 0.75IN × 0.50IN PIECE
STAND-OFF, NYLON, 0.375˝
REFERENCE
PART DESCRIPTION
KEYSTONE, 8832
MANUFACTURER/PART NUMBER
DC2181A-A Required Circuit Components
1
0
R9
NO LOAD. SMD 0402
2
1
R10
RES, CHIP, 0Ω JUMPER, 1/16W, 0402
VISHAY, CRCW04020000Z0ED
3
1
U1
400mA WIRELESS SYNCHRONOUS BUCK BATTERY
CHARGER, 3mm × 3mm QFN16
LINEAR TECHNOLOGY, LTC4120EUD-4.2
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC2181A-B Required Circuit Components
1
1
R9
RES, CHIP, 1.40M, ±1%, 1/16W, 0402
VISHAY, CRCW04021M40FKED
2
1
R10
RES, CHIP, 1.05M, ±1%, 1/16W, 0402
VISHAY, CRCW04021M05FKED
3
1
U1
400mA WIRELESS SYNCHRONOUS BUCK BATTERY
CHARGER, 3mm × 3mm QFN16
LINEAR TECHNOLOGY, LTC4120EUD
dc2181afb
9
DEMO MANUAL
DC2181A-A/B
Parts List
ITEM
QTY
REFERENCE
PART DESCRIPTION
MANUFACTURER/PART NUMBER
DC1968A Bill of Materials
DC1968A Required Circuit Components
1
1
CX1, CX2
CAP, CHIP, PPS, 0.15µF, ±2%, 50V, 6mm × 4.1mm
PANASONIC, ECHU1H154GX9
2
2
C4, C5
CAP, CHIP, X7R, 0.01µF, ±10%, 50V, 0402
MURATA, GRM155R71H103KA88D
3
1
C6
CAP, CHIP, X7R, 4.7µF, ±10%, 50V, 0402
MURATA, GRM31CR71H475KA12L
4
1
C7
CAP, CHIP, X5R, 0.068µF, ±10%, 50V, 0603
MURATA, GRM188R71H683K
5
1
C8
CAP, CHIP, C0G, 330pF, ±5%, 50V, 0402
TDK, C1005COG1H331J
6
1
C9
CAP, CHIP, X7R, 0.47µF, ±10%, 25V, 0603
MURATA, GRM188R71E474K
7
1
C10
CAP, CHIP, X5R, 22µF, ±20%, 6.3V, 0805
TAIYO-YUDEN, JMK212BJ226MG
8
2
D1, D4
DIODE, ZENER, 16V, 350mV, SOT23
DIODES, BZX84C16
9
2
D2, D3
DIODE, SCHOTTKY, 40V, 1A, 2DSN
ON SEMICONDUCTOR, NSR10F40NXT5G
10
1
D5
DIODE, SCHOTTKY, 40V, 2A, PowerDI123
DIODES, DFLS240L
11
2
L1, L2
IND, SMT, 68µH, 0.41A, 0.40Ω, ±20%, 5mm × 5mm
TDK, VLCF5028T-680MR40-2
12
1
L3
IND, SMT, 4.7µH, 1.6A, 0.125Ω, ±20%, 4mm × 4mm
COILCRAFT, LPS4018-472M
13
1
Lx
TRANSMIT COIL
TDK, WT-505060-8K2-LT
14
2
M1, M2
MOSFET, SMT, N-CHANNEL, 60V, 11mΩ, SO8
VISHAY, Si4108DY-T1-GE3
15
1
M3
MOSFET, SMT, P-CHANNEL, –12V, 32mΩ, SOT23
VISHAY, Si2333DS
16
1
M4
MOSFET, SMT, N-CHANNEL, 60V, 7.5Ω, 115mA, SOT23
ON SEMI, 2N7002L
17
2
R1, R2
RES, CHIP, 100Ω, ±5%, 1/16W, 0402
VISHAY, CRCW0402100RJNED
18
2
R3, R8
RES, CHIP, 150kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW0402150JNED
19
1
R4
RES, CHIP, 40.2kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW040240K2FKED
20
1
R5
RES, CHIP, 20kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW040220K0FKED
21
2
R6, R10
RES, CHIP, 100kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW0402100KFKED
22
1
R7
RES, CHIP, 536kΩ, ±1%, 1/16W, 0402
VISHAY, CRCW0402536KFKED
23
1
U1
LT3480EDD, PMIC 38V, 2A, 2.4MHz STEP-DOWN SWITCHING LINEAR TECHNOLOGY, LT3480EDD
REGULATOR WITH 70µA QUIESCENT CURRENT
Additional Demo Board Circuit Components
1
0
CX3-OPT, CX4-OPT
CAP, PPS, 0.15µF, 2.5%, 63VAC, MKS02
WIMA, MKS0D031500D00JSSD
2
1
D6
LED, GREEN, 0603
LITE-ON, LTST-C190KGKT
3
1
R9
RES, CHIP, 1kΩ, ±5%, 1/16W, 0402
VISHAY, CRCW04021K00JNED
TURRET, 0.09 DIA
MILL-MAX, 2501-2-00-80-00-00-07-0
STAND-OFF, NYLON, 0.375˝
KEYSTONE, 8832
Hardware: For Demo Board Only
1
6
2
4
10
E1 TO E6
dc2181afb
1
2
3
4
PROG
NTC
GND
Cx
E2
E1
J2
J1
AE1
J2
J1
5%
R4
2.0k
4
VPROG
C2P1
4700pF
5%
50V
0805
C2S1
4700pF
5%
50V
0805
NOTE: PCB AE1 CONNECTS TO J1 AND J2
FIGURE 1.
4
C2P2
1800pF
5%
50V
0603
C2S2
0.022µF
5%
50V
0805
D2
DFLS240L
D1
DFLS240L
R36
0
R37
0
OPT
3
R7
10k
13
10
12
6
7
16
PROG
BATSNS/FB
NTC
DHC
FREQ
RUN
C5
10µF
50V
1210
IN
17
GND
-B
ASSY
-A
*
11
9
8
4
2
1
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
L1
15.0uH
R12
100k
5%
6.3V
C4
2.2µF
INTVCC
TECHNOLOGY
R10
0 Ohm
1.05MEG
DATE
7 - 17 - 14
FAULT
VBAR
CHRG
1
2
3
J3
OPT
DF3-3P-2DSA
BAT
GND
ENTC
BAT
2.7 V - 4.2V
C2
400mA
47uF
16V
1210 E3
GND
E4
E5
E6
GND
VIN
12V - 40V
E7
E8
GEORGE B.
DATE:
N/A
SIZE
1
SHEET
LTC4120EUD - 4.2 / LTC4120EUD
DEMO CIRCUIT 2181A - A / B
7 - 17 - 14
I C NO.
1
OF
3
2
REV.
400mA WIRELESS SYNCHRONOUS BUCK BATTERY CHARGER
TITLE: SCHEMATIC
LTC4120EUD
R9
OPEN
1.40MEG
R10 *
U1
R9 *
APPROVED
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
PRODUCTION
3
R11
100k
5%
DESCRIPTION
REV
R10 TO BE CONNECTED TO " BAT "
NODE AT BAT TURRET (E4)
C1
10uF
16V
0805
0603
C3
0.01µF
-
ECO
1
REVISION HISTORY
LTC4120EUD - 4.2
APPROVALS
NC/FBG
BAT
CHGSNS
SW
BOOST
INTVCC
FAULT
CHRG
15
14
U1
3 LTC4120EUD-4.2 / LTC4120EUD
2
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
NC
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. GEORGE B.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
5
GND
D4
DFLZ39
39V
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
EXT
INT
R5
3.01k
R8
0 OPT
10k
R3
INTVCC
412k
R2
RUN FOR VIN > 11V
R1
1.40MEG
R6
0
DO *NOT* INSTALL R36 AND R37 SIMULTANEOUSLY
750 kHz
1.5 MHz
D3
DFLS240L
INTVCC
3
1
2
3
4
DEMO MANUAL
DC2181A-A/B
Schematic Diagram
11
dc2181afb
1.221V
LTC1445CDHD
U2E
VPROG
8
V-REF
9
5%
R13
10k
C7
1µF
10V
R14
432
0
R38
49.9k
R24
R23
100k
R22
100k
R21
100k
R20
100k
R19
100k
R18
100k
R17
100k
34.8k
R16
R15
22.6k
C6
0.01µF
C8
0.01µF
U3.3
C9
0.01µF
U2.3
787k
R34
R33
22.6k
C10
1µF
10V
432
R35
LTC1445CDHD
U3D
U3C
LTC1445CDHD
U3B
LTC1445CDHD
1.186V
U3A
LTC1445CDHD
U2D
LTC1445CDHD
LTC1445CDHD
U2C
1.186V
LTC1445CDHD
U2B
LTC1445CDHD
U2A
12
13
10
11
6
7
4
5
12
13
10
11
6
7
4
5
8
V-REF
12
9
VBAR
15
16
1
2
15
16
1
2
LTC1445CDHD
U3E
149 17
3
149 17
3
149 17
3
149 17
3
149 17
3
149 17
3
149 17
3
149 17
3
D5
D6
D7
D8
D9
D10
D11
D12
2
2
2
2
2
2
2
2
6%
19%
31%
44%
56%
69%
81%
94%
CHG CURRENT
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
CUSTOMER NOTICE
1
1
1
1
1
1
1
1
SCALE = NONE
GEORGE B.
NC
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
5%
R25
1k
5%
R26
1k
5%
R27
1k
5%
R28
1k
5%
R29
1k
5%
R30
1k
5%
R31
1k
5%
R32
1k
TECHNOLOGY
SHEET
LTC4120EUD - 4.2 / LTC4120EUD
DEMO CIRCUIT 2181A - A / B
7 - 17 -14
IC NO.
2
BAR GRAPH FOR 400mA WIRELESS SYNCHRONOUS
BUCK BATTERY CHARGER
DATE:
N/A
SIZE
TITLE: SCHEMATIC
OF
3
2
REV.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
DEMO MANUAL
DC2181A-A/B
Schematic Diagram
dc2181afb
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
1
2
3
4
VCC
GND
E4
E3
4.75V - 5.25V
GND
E2
HVIN
8V - 38V
C7
0.068uF
50V
0603
5%
R3
150k
C6
4.7uF
50V
1206
4
R4
40.2k
4
RT
FB
8
SYNC
RUN/SS
10
6
5
4
11
GND
VIN
Vc
PG
SW
BOOST
BD
9
7
3
2
1
U1
LT3480EDD
5%
C8
330pF
R5
20k
C9
0.47uF
25V
0603
1
L3
4.7uH
R9
1K
5%
D6
ON
D5
DFLS240L
40V
2A
3
3
M1
Si4108DY-T1-GE3
2
E1
321
5678
R6
100k
R7
536k
4
1
5%
R8
150k
2
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
SCALE = NONE
APP ENG.
4
123
8765
-
ECO
TECHNOLOGY
DAT E
Cx
Cy
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
E5
Lx
5.0uH
5%
E6
9 - 17 - 13
9 - 17 - 13
IC NO.
1
LTC4120EUD-4.2 / LTC4120EUD
DEMO CIRCUIT 1968A
SHEET 1
OF
1
3
REV.
BASIC INDUCTIVE TRANSMITTER WITH PRE - REGULATOR
DATE:
N/A
SIZE
Cx4
0.15uF
2.5%
MKS02
OPT
GEORGE B.
APPROVED
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
M2
Si4108DY-T1-GE3
Cx2
0.15uF
2%
FC6041
Cx3
0.15uF
2.5%
MKS02
OPT
DESCRIPTION
PRODUCTION FAB
3
Cx1
0.15uF
2%
FC6041
1
REVISION HISTORY
REV
NC
GEORGE B. TITLE: SCHEMATIC
APPROVALS
D4
BZX84C16
16V
PCB DES.
5%
100
C5
0.01uF
100
5%
L2
68uH
D3
NSR10F40NXT5G
M3
Si2333DS
R2
M4
2N7002L
2
3
R1
2
3
R10
100k
1
CUSTOMER NOTICE
D1
BZX84C16
16V
C4
0.01uF
D2
NSR10F40NXT5G
L1
68uH
6.3V
0805
20%
C10
22uF
5V OUT
2
1
2
3
4
DEMO MANUAL
DC2181A-A/B
Schematic Diagram
dc2181afb
13
DEMO MANUAL
DC2181A-A/B
The DC1968A Basic Wireless Transmitter is available from Linear Technology as part of the DC1969A-B Wireless Power Kit.
To obtain the DC1968A Basic Wireless Transmitter, please order the DC1969A-B kit.
The ProxiPoint Transmitters are available from PowerByProxy: www.powerbyproxi.com/evaluation-kits/proxi-point/
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
14 Linear Technology Corporation
dc2181afb
LT 0815 REV B • PRINTED IN USA
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507 ● www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014