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PDF LTC4120-4.2 Data sheet ( Hoja de datos )
| Número de pieza | LTC4120-4.2 | |
| Descripción | Wireless Power Receiver and 400mA Buck Battery Charger | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC4120/LTC4120-4.2
Wireless Power Receiver and
400mA Buck Battery Charger
Features
n Dynamic Harmonization Control Optimizes
Wireless Charging Over a Wide Coupling Range
n Wide Input Voltage Range: 12.5V to 40V
n Adjustable Float Voltage: 3.5V to 11V
n Fixed 4.2V Float Voltage Option: LTC4120-4.2
n 50mA to 400mA Charge Current Programmed with a
Single Resistor
n ±1% Feedback Voltage Accuracy
n Programmable 5% Accurate Charge Current
n No Microprocessor Required
n No Transformer Core
n Thermally Enhanced, Low Profile 16-Lead
(3mm × 3mm × 0.75mm) QFN Package
Applications
n Handheld Instruments
n Industrial/Military Sensors and Devices
n Harsh Environments
n Portable Medical Devices
n Physically Small Devices
n Electrically Isolated Devices
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
Description
The LTC®4120 is a constant-current/constant-voltage wire-
less receiver and battery charger. An external program-
ming resistor sets the charge current up to 400mA. The
LTC4120-4.2 is suitable for charging Li-Ion/Polymer bat-
teries, while the programmable float voltage of the LTC4120
accommodates several battery chemistries. The LTC4120
uses a Dynamic Harmonization Control (DHC) technique that
allows high efficiency contactless charging across an air gap.
The LTC4120 regulates its input voltage via the DHC pin.
This technique modulates the resonant frequency of a
receiver tank to automatically adjust the power received
as well as the power transmitted to provide an efficient
solution for wirelessly charging battery-powered devices.
Wireless charging with the LTC4120 provides a method
to power devices in harsh environments without requiring
expensive failure-prone connectors. This allows products
to be charged while locked within sealed enclosures, or
in moving or rotating equipment, or where cleanliness or
sanitation is critical.
This full featured battery charger includes accurate RUN
pin threshold, low voltage battery preconditioning and bad
battery fault detection, timer termination, auto-recharge,
and NTC temperature qualified charging. The FAULT pin
provides an indication of bad battery or temperature faults.
Once charging is terminated, the LTC4120 signals end-of-
charge via the CHRG pin, and enters a low current sleep
mode. An auto-restart feature starts a new charging cycle
if the battery voltage drops by 2.2%.
Typical Application
26.7nF
Tx CIRCUITRY
6.5nF
5µH 47µH
IN
RUN
10µF
INTVCC
FREQ
BOOST
LTC4120
SW
DHC CHGSNS
NTC
FAULT
BAT
CHRG
FB
GND PROG FBG
2.2µF
22nF 33µH
1.01M
1.35M
Li-Ion +
4.2V
T
Wireless Rx Voltage/Charge Current vs Spacing
40
35
VIN
30
25
NOT
CHARGING
ICHARGE
MAX
400
333
267
200
20
CHARGING
15
133
67
3.01k
22µF
4120 TA01a
10
0.4 0.6
0.8 1.0 1.2 1.4
SPACING (cm)
0
1.6 1.8
4120 TA01b
4120fd
For more information www.linear.com/LTC4120
1
1 page  
LTC4120/LTC4120-4.2
E lectrical Characteristics The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications
VFB = 2.29V (LTC4120), VBATSNS = 4V (LTC4120-4.2).
CaurerraetntTAin=to2a5°pCin(Nisopteos2i)t.ivVeINou=tVoRfUtNhe=p1i5nVi,s
VnCeHgGaStNivSe=.
VBAT
=
4V,
RPROG
=
3.01k,
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
RUN
VEN Enable threshold
Hysteresis
IRUN Run Pin Input Current
VSD Shutdown Threshold (Note 3)
Hysteresis
VRUN Rising
VRUN Falling
VRUN = 40V
VRUN Falling
l 2.35 2.45 2.55
200
0.01 0.1
l 0.4
1.2
220
V
mV
µA
V
mV
FREQ
VIL FREQ Pin Input Low
VIH FREQ Pin Input High
IFREQ
FREQ Pin Input Current
Dynamic Harmonization Control
VINTVCC-VFREQ
0V < VFREQ < VINTVCC
l 0.4
l
V
0.6 V
±1 µA
VIN(DHC)
IDHC
Input Regulation Voltage
DHC Pin Current
VDHC = 1V, VIN < VIN(DHC)
14 V
330 mARMS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4120 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC4120E is guaranteed to meet performance specifications
for junction temperatures from 0°C to 85°C. Specifications over the
–40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC4120I is guaranteed over the full –40°C to 125°C operating
junction temperature range. Note that the maximum ambient temperature
consistent with these specifications is determined by specific operating
conditions in conjunction with board layout, the rated package thermal
impedance, and other environmental factors.
Note 3: Standby mode occurs when the LTC4120 stops switching due
to an NTC fault condition, or when the charge current has dropped low
enough to enter Burst Mode operation. Disabled mode occurs when VRUN
is between VSD and VEN. Shutdown mode occurs when VRUN is below
VSD or when the differential undervoltage lockout is engaged. SLEEP
mode occurs after a timeout while the battery voltage remains above the
RECHRG threshold.
Note 4: The internal supply INTVCC should only be used for the NTC
divider, it should not be used for any other loads.
Note 5: The FB pin is measured with a resistance of 588k in series with
the pin.
Note 6: hC/10 is expressed as a fraction of measured full charge current as
measured at the PROG pin voltage when the CHRG pin de-asserts.
Note 7: In an application circuit with an inductor connected from SW to
CHGSNS, the total battery leakage current when disabled is the sum of
IBAT, IFBG and ISW (LTC4120), or IBATSNS and IBAT and ISW (LTC4120-4.2).
Note 8: When no supply is present at IN, the SW powers IN through
the body diode of the topside switch. This may cause additional SW pin
current depending on the load present at IN.
Note 9: Guaranteed by design and/or correlation to static test.
For more information www.linear.com/LTC4120
4120fd
5
5 Page 
Block Diagram
LTC4120/LTC4120-4.2
LTC4120-4.2
BATSNS
IN – 80mV
ITH
+
– DUVLO
IN
1.2V
INTVCC
+
–
UVCL
BATSNS
2.21V
–
+
LOWBAT
INTVCC
+
–
C-EA
CHGSNS
RSNS
0.3Ω
BAT
8
9
INTVCC
–
+
588k
V-EA
BATSNS 10
VFB(REG)
ENABLE
CBAT +
22µF
Li-Ion
PROG 13
DZ RPROG
4120 F02
Figure 2. LTC4120-4.2 BATSNS Connections
Test Circuit
20V
2k
665Ω 49.9Ω
680nF
665Ω
IRLML5103TR
VIN(DHC) IN
NTC
LTC4120
RUN
10Ω
INTVCC
10µF
DHC GND
Figure 3. VIN(DHC) Test Circuit
2.2µF
4120 F03
For more information www.linear.com/LTC4120
4120fd
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4120-4.2.PDF ] | |
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