Charger. LTC4120EUD Datasheet

LTC4120EUD Datasheet PDF

Part LTC4120EUD
Description Wireless Power Receiver and 400mA Buck Battery Charger
Feature LTC4120EUD; LTC4120/LTC4120-4.2 Wireless Power Receiver and 400mA Buck Battery Charger FEATURES n Dynamic Harm.
Manufacture Analog Devices
Datasheet
Download LTC4120EUD Datasheet




LTC4120EUD
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
All registered trademarks and 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 batter-
ies, 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
INTVCC
RUN
FREQ
2.2µF
10µF
BOOST
LTC4120
22nF 33µH
SW
DHC
CHGSNS
NTC
FAULT
BAT
CHRG
1.01M Li-Ion +
FB
4.2V
T
GND PROG FBG
1.35M
Wireless Rx Voltage/Charge Current vs Spacing
40
35
VIN
30
25
NOT
CHARGING
400
ICHARGE
MAX
333
267
200
20
133
CHARGING
15
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
Rev. G
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1



LTC4120EUD
LTC4120/LTC4120-4.2
ABSOLUTE MAXIMUM RATINGS (Note 1)
IN, RUN, CHRG, FAULT, DHC....................... –0.3V to 43V
BOOST.................................... VSW – 0.3V to (VSW + 6V)
SW (DC)......................................... –0.3V to (VIN + 0.3V)
SW (Pulsed <100ns)....................... –1.5V to (VIN + 1.5V)
CHGSNS, BAT, FBG, FB................................–0.3V to 12V
FREQ, NTC, PROG, INTVCC........................... –0.3V to 6V
ICHGSNS, IBAT...................................................... ±600mA
IDHC................................................................ 350mARMS
ICHRG, IFAULT, IFBG...................................................±5mA
IFB ..........................................................................±5mA
IINTVCC................................................................... –5mA
Operating Junction Temperature Range
(Note 2)................................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
LTC4120
TOP VIEW
16 15 14 13
INTVCC 1
12NTC
BOOST 2
IN 3
17
11FBG
GND
10 FB
SW 4
9 BAT
5678
LTC4120-4.2
TOP VIEW
16 15 14 13
INTVCC 1
12 NTC
BOOST 2
17
11 NC
IN 3
GND
10 BATSNS
SW 4
9 BAT
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN θJA
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJA = 54°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB TO OBTAIN θJA
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4120EUD#PBF
LTC4120EUD#TRPBF LGHB
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC4120IUD#PBF
LTC4120IUD#TRPBF
LGHB
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC4120EUD-4.2#PBF LTC4120EUD-4.2#TRPBF LGMT
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC4120IUD-4.2#PBF
LTC4120IUD-4.2#TRPBF LGMT
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
LTC4120 OPTIONS
LTC4120
LTC4120-4.2
FLOAT VOLTAGE
Programmable
4.2V Fixed
Rev. G
2
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LTC4120EUD
LTC4120/LTC4120-4.2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C (Note 2). VIN = VRUN = 15V, VCHGSNS = VBAT = 4V, RPROG = 3.01k,
VFB = 2.29V (LTC4120), VBATSNS = 4V (LTC4120-4.2). Current into a pin is positive out of the pin is negative.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Operating Input Supply Range
l 12.5
40
V
Battery Voltage Range
0
11
V
IIN
DC Supply Current
Switching, FREQ = GND
Standby Mode (Note 3)
3.5
mA
l
130 220
µA
Sleep Mode (Note 3)
LTC4120: VFB = 2.51V (Note 5),
LTC4120-4.2: VBATSNS = 4.4V
Disabled Mode (Note 3)
l
60 100
µA
l
37 70
µA
Shutdown Mode (Note 3)
l
20 40
µA
VDUVLO Differential Undervoltage Lockout
Hysteresis
UVINTVCC INTVCC Undervoltage Lockout
Hysteresis
Battery Charger
VIN-VBAT Falling, VIN = 5V (LTC4120),
VIN-VBATSNS Falling, VIN = 5V (LTC4120-4.2)
l 20 80 160
mV
VIN-VBAT Rising, VIN = 5V (LTC4120),
VIN-VBATSNS Rising, VIN = 5V (LTC4120-4.2)
115
mV
INTVCC Rising, VIN = INTVCC + 100mV, VBAT = NC l 4.00 4.15 4.26
V
INTVCC Falling (Note 4)
220
mV
IBAT
BAT Standby Current
Standby Mode (LTC4120) (Notes 3, 7, 8)
l
Standby Mode (LTC4120-4.2) (Notes 3, 7, 8)
l
2.5 4.5
µA
50 1000
nA
BAT Shutdown Current
Shutdown Mode (LTC4120) (Notes 3, 7, 8)
l
Shutdown Mode (LTC4120-4.2) (Notes 3, 7, 8)
l
1100 2000
nA
10 1000
nA
IBATSNS
BATSNS Standby Current (LTC4120-4.2)
BATSNS Shutdown Current (LTC4120-4.2)
Standby Mode (Notes 3, 7, 8)
Shutdown Mode (Notes 3, 7, 8)
l
5.4 10
µA
l
1100 2000
nA
IFB
IFBG(LEAK)
RFBG
VFB(REG)
Feedback Pin Bias Current (LTC4120)
VFB = 2.5V (Notes 5, 7)
Feedback Ground Leakage Current (LTC4120) Shutdown Mode (Notes 3, 7)
Feedback Ground Return Resistance (LTC4120)
Feedback Regulation Voltage (LTC4120)
(Note 5)
l
25 60
nA
l
1
µA
l
1000 2000
Ω
2.393 2.400 2.407
V
l 2.370
2.418
V
VFLOAT
Regulated Float Voltage (LTC4120-4.2)
4.188 4.200 4.212
V
l 4.148
4.227
V
ICHG
Battery Charge Current
VUVCL
VRCHG
VRCHG_4.2
hPROG
Undervoltage Current Limit
Battery Recharge Threshold
Battery Recharge Threshold
Ratio of BAT Current to PROG Current
VPROG
RSNS
PROG Pin Servo Voltage
CHGSNS-BAT Sense Resistor
RPROG = 3.01k
RPROG = 24.3k
VIN Falling
VFB Falling Relative to VFB_REG (LTC4120) (Note 5)
VBATSNS Falling Relative to VFLOAT (LTC4120-4.2)
VTRKL < VFB < VFB(REG) (LTC4120) (Note 5)
VTRKL_4.2 < VBATSNS < VFLOAT (LTC4120-4.2)
IBAT = –100mA
l 383
l 45
l –38
l –70
402 421
50 55
12.0
–50 –62
–92 –114
988
l 1.206 1.227 1.248
300
mA
mA
V
mV
mV
mA/mA
V
Rev. G
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