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LTC4125EUFD#PBF

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LTC4125
1
4125f
For more information www.linear.com/LTC4125
Typical applicaTion
FeaTures DescripTion
5W AutoResonant Wireless
Power Transmitter
The LT C
®
4125 is a simple and high performance monolithic
full bridge resonant driver capable of delivering over 5W of
power wirelessly to a properly tuned receiver. The device
controls the current flow in a series connected transmit coil
LC network to create a simple, safe and versatile wireless
power transmitter.
The LTC4125 automatically adjusts its driving frequency
to match the LC network resonant frequency. This
AutoResonant switching allows the device to deliver
maximum power from a low voltage input supply (3V to
5.5V) to a tuned receiver. To optimize system efficiency,
the LTC4125 employs a periodic transmit power search
and adjusts the transmission power based on the receiver
load requirements. The device stops delivering power
during a fault condition, or if a foreign object is detected.
The LTC4125 also includes a programmable maximum
average input current limit and an NTC input as additional
means for foreign object and overload protection. The
LTC4125 is available in a 20-lead low profile (0.75mm)
4mm × 5mm QFN package.
applicaTions
n
Monolithic 5W Wireless Power Transmitter
n
AutoResonant
TM
Switching Frequency Adjusts to Res-
onant Capacitance and Transmit Coil Inductance*
n
Transmit Power Automatically Adjusts to Receiver
Load*
n
Input Voltage Range: 3V to 5.5V
n
Integrated 100mΩ Full Bridge Switches
n
Multiple Foreign Object Detection Methods
n
Programmable Average Input Current Limit and
Monitor
n
NTC Input for System/Component Temperature
Qualified Power Transfer
n
Wide Operating Switching Frequency Range:
50kHz to 250kHz
n
Thermally Enhanced 4mm × 5mm QFN 20-Lead Package
n
Hermetically and/or Electrically Insulated Devices
n
Military Sensors and Devices
n
Medical Equipment
n
Industrial Handhelds
L, LT , LT C , LT M , Linear Technology and the Linear logo are registered trademarks and
AutoResonant is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 9041254.
*The AutoResonant and Auto Load Detect features use patent pending circuits and algorithms.
C
TX
100nF
+
–
STAT
IS
–
IS
+
EN
FTH
PTHM
NTC
SW1
SW2
FB
59.0k
100k
2.21k
470pF10nF
10nF
1µF
11.3k
20mΩ
4.7nF
100µF
10k
100k
R
L
V
IN
348k
5.23k
L
TX
24µH
L
TX
COIL
L
RX
COIL
V
IN
V
IN
V
IN
3V TO 5.5V
10k
TRANSMITTER
CIRCUIT
RECEIVER
CIRCUIT
C
FB1
0.1µF
4125 TA01
AIR GAP
IMON CTD CTS GND
IN IN1 IN2
LTC4125
5W Wireless Transmitter
LTC4125
2
4125f
For more information www.linear.com/LTC4125
pin conFiguraTionabsoluTe MaxiMuM raTings
IN, IS
–
, CTD ............................................. –0.3V to 6V
IN1, IN2, IS
+
................................. –0.3V to V
IN
+ 0.3V
DTH, FTH, PTHM, FB ................... –0.3V to V
IN
+ 0.3V
NTC, EN, PTH1, PTH2, CTS.......... –0.3V to V
IN
+ 0.3V
IMON ................ –0.3V to MIN(V
IN
, V
IS
+, V
IS
–) + 0.3V
STAT ........................................... –0.3V to V
IN
+ 0.3V
STAT ......................................................–1mA to 2mA
Operating Junction Temperature Range
(Note 2) ............................................. –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
(Note 1)
20 19 18 17
7 8
TOP VIEW
21
GND
UFD20 PACKAGE
20-LEAD (4mm × 5mm) PLASTIC QFN
9 10
6
5
4
3
2
1
11
12
13
14
15
16
IN
CTS
IS
–
IS
+
IMON
NTC
GND
EN
CTD
FB
PTHM
PTH1
IN1
SW1
SW2
IN2
DTH
STAT
FTH
PTH2
T
JMAX
=125°C, θ
JA
=43°C/W
EXPOSED PAD (PIN 21) MUST BE CONNECTED TO GND
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC4125EUFD#PBF LTC4125EUFD#TRPBF 4125 20-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
LTC4125IUFD#PBF LTC4125IUFD#TRPBF 4125 20-Lead (4mm × 5mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with
#TRMPBF suffix.
LTC4125
3
4125f
For more information www.linear.com/LTC4125
elecTrical characTerisTics
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply Operating Range V
IN
=V
IN1
=V
IN2
l
3 5.5 V
Input Supply Quiescent Current
At IN pin
At IN1, IN2 pin
SW1 and SW2 Open
EN = 5V
1
50
2
150
mA
μA
Enable Pin
EN Leakage Current V
EN
=5V
l
0.2 0.5 1.2 μA
EN Falling Threshold V
EN
Falling 1.20 V
EN Hysteresis 16 mV
Search Delay Oscillator Pins
I
CTS,PU
CTS Pull-Up Current V
CTS
=0V –10 µA
I
CTS,PD
CTS Pull-Down Current V
CTS
=2V 10 µA
CTS Pin Frequency C
CTS
=4.7nF 1.0 1.7 2.4 kHz
CTS Threshold for AutoResonant Disable
l
1.8 2.3 2.8 V
I
CTD,PU
CTD Pull-Up Current V
CTD
=0V –10 µA
I
CTD,PD
CTD Pull-Down Current V
CTD
=2V 10 µA
CTD Pin Frequency C
CTD
=470pF 10 17 24 kHz
Resonant Driver and Pulse Width Modulator
Operating Frequency Range 50 250 kHz
R
A,B,C,D
Switch On Resistances MOSFETs A, B, C and D (Block Diagram) 150 mΩ
Switch Pins Minimum On Time SW1, SW2 150 ns
Minimum PTH Voltage for Switching 35 mV
PTH Voltage to Pulse Width Gain normalized to
the LC natural frequency (f
n
)
SW1 On Time • f
n
/ ∆V
PTH1
,
SW2 On Time • f
n
/ ∆V
PTH2
0.24 V
–1
PTH Pull Up Current when Overdriving V
PTH1
=V
PTH2
=0V
l
–20 –10 –5 μA
PTH Pull Down Current when Overdriving V
PTH1
=V
PTH2
=5V
l
10 20 40 μA
Auto Load Detection
V
PTH
Step Size during Auto Load Detection
Search
75 mV
Delay Time between Optimum Point Search C
CTD
=470pF 3.7 s
Optimum Point Search Duration C
CTS
=470pF (Figure 13) 40 ms
FB Pin Leakage Current V
FB
=5V
l
0.2 0.5 1.2 μA
FB Over-Range Rising Threshold V
FB
Rising
l
V
IN
– 0.04 V
IN
V
IN
+ 0.04 V
FB Over-Range Threshold Hysteresis 40 mV
PTHM Pin Leakage Current V
PTHM
=5V
l
0.2 0.5 1.2 μA
PTHM Pin Common Mode Voltage Range 0 5 V
FTH Pin Leakage Current V
FTH
=0V
l
–1.2 –0.5 –0.2 μA
FTH Voltage to Frequency Gain 64 kHz/V
DTH Pin Leakage Current V
DTH
=0V
l
–1.2 –0.5 –0.2 μA
The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T
A
=25°C. V
IN
=V
IN1
=V
IN2
=5V unless otherwise noted (Notes 2, 3).
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LTC4125EUFD#PBF

Mfr. #:
Buy LTC4125EUFD#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Wireless Charging ICs 5W AutoResonant Wireless Pwr Transmitter
Lifecycle:
New from this manufacturer.
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