LTC4053EDD-4.2#TR [Linear]
LTC4053-4.2 - USB Compatible Lithium-Ion Battery Charger with Thermal Regulation; Package: DFN; Pins: 10; Temperature Range: -40°C to 85°C;型号: | LTC4053EDD-4.2#TR |
厂家: | Linear |
描述: | LTC4053-4.2 - USB Compatible Lithium-Ion Battery Charger with Thermal Regulation; Package: DFN; Pins: 10; Temperature Range: -40°C to 85°C 电池 光电二极管 |
文件: | 总16页 (文件大小:179K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
LTC4053-4.2
USB Compatible
Lithium-Ion Battery Charger
with Thermal Regulation
U
FEATURES
DESCRIPTIO
The LTC®4053 is a standalone linear charger for lithium-
ionbatteriesthatcanbepowereddirectlyfromaUSBport.
The IC contains an on-chip power MOSFET and eliminates
the need for an external sense resistor and blocking diode.
Thermal regulation automatically adjusts charge current
tolimitdietemperatureduringhighpowerorhighambient
temperature conditions. This feature protects the end
product and the LTC4053 from thermal stress while the IC
charges the battery at maximum rate without interruption.
■
Charges Single-Cell Li-Ion Batteries Directly from
USB Port
■
Thermal Regulation Maximizes Charge Rate
without Risk of Overheating*
■
Programmable Charge Current with ±7% Accuracy
■
Low Dropout Operation
■
No External MOSFET, Sense Resistor or Blocking
Diode Required
■
Programmable Charge Termination Timer
■
Preset Charge Voltage with ±1% Accuracy
The charge current and charge time can be set externally
with a single resistor and capacitor, respectively. When
the input supply (wall adapter or USB supply) is removed,
the LTC4053 automatically enters a low current sleep
mode, dropping the battery drain current to less than 5µA.
■
C/10 Charge Current Detection Output
■
AC Present Logic Output
■
25µA Supply Current in Shutdown Mode
■
Automatic Recharge
■
Charge Current Monitor Useful for Gas Gauging
■
■
The LTC4053 also includes NTC temperature sensing,
C/10 detection circuitry, AC present logic, low battery
chargeconditioning(tricklecharging)andshutdown(25µA
supply current).
Thermistor Input for Temperature Qualified Charging
Available in 10-pin thermally enhanced MSOP and
low profile (0.75mm) 3mm × 3mm DFN packages
U
APPLICATIO S
The LTC4053 is available in 10-pin thermally enhanced
MSOP and low profile (0.75mm) DFN packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
Protected by U.S. Patents including 6522118, 6700364.
■
Cellular Telephones
■
Handheld Computers
■
Charging Docks and Cradles
MP3 Players
Digital Cameras
■
■
U
TYPICAL APPLICATIO
Charge Current vs Input Voltage
600
USB Powered Standalone Li-Ion Charger
T
= 25°C
PROG
A
R
= 3k
V
= 3.95V
BAT
500
400
300
200
100
0
2
9
SYSTEM
LOAD
USB PORT
4.35V TO 5.5V
V
BAT
CC
+
Li-Ion
V
= 4.05V
BATTERY
BAT
LTC4053-4.2
4
8
SUSPEND
TIMER
SHDN
GND NTC PROG
4.7µF
USB CONTROL
3.74k
V
= 4.15V
4.5
5
6
7
BAT
µC
100mA/
500mA
0.1µF
15k
4.0
5.0
5.5
V
(V)
CC
4053TA01
4053 G04
4053fa
1
LTC4053-4.2
W W
U W
(Note 1)
ABSOLUTE AXI U RATI GS
Input Supply Voltage (VCC) ....................................... 7V
BAT........................................................................... 7V
NTC, SHDN, TIMER, PROG............ –0.3V to VCC + 0.3V
CHRG, FAULT, ACPR .................................. –0.3V to 7V
BAT Short-Circuit Duration .......................... Continuous
BAT Current (Note 2) ............................................. 1.3A
PROG Current (Note 2) ....................................... 1.3mA
Junction Temperature.......................................... 125°C
Operating Temperature Range (Note 3) ...–40°C to 85°C
Storage Temperature Range
MSE.................................................. –65°C to 150°C
DD .................................................... –65°C to 125°C
Lead Temperature (Soldering, 10 sec)
MSE.................................................................. 300°C
U
W
U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ORDER PART
ORDER PART
TOP VIEW
CHRG
1
2
3
4
5
10 ACPR
NUMBER
NUMBER
CHRG
1
2
3
4
5
10 ACPR
V
9
8
7
6
BAT
CC
V
9
8
7
6
BAT
CC
11
11
FAULT
TIMER
GND
SHDN
PROG
NTC
FAULT
TIMER
GND
SHDN
PROG
NTC
LTC4053EDD-4.2
LTC4053EMSE-4.2
MSE EXPOSED PAD PACKAGE
10-LEAD PLASTIC MSOP
DD PACKAGE
DD PART MARKING
LBQC
MSE PART MARKING
LTZT
TJMAX = 125°C, θJA = 40°C/W (NOTE 4)
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
10-LEAD (3mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W (NOTE 4)
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = 5V
A
CC
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
V
Supply Voltage
Supply Current
●
4.25
6.5
V
CC
CC
CC
I
Charger On; Current Mode; R
= 30k (Note 5)
●
●
●
1
25
25
2
50
50
mA
µA
µA
CC
PROG
Shutdown Mode; V
= 0V
or V ≤ 4V
SHDN
Sleep Mode V < V
CC
BAT
CC
V
V
Regulated Float Voltage
●
4.158
4.2
4.242
V
BAT
BAT
I
Battery Pin Current
R
R
= 3k; Current Mode
= 15k; Current Mode
●
●
465
93
500
100
±1
535
107
±3
mA
mA
µA
BAT
PROG
PROG
Shutdown Mode; V
Sleep Mode V < V
= 0V
SHDN
or V < (V – ∆V )
±1
±3
µA
CC
BAT
CC
UV
UV
I
Trickle Charge Current
V
V
< 2V; R
= 3k
PROG
●
●
35
50
2.48
100
4
65
mA
V
TRIKL
BAT
BAT
V
Trickle Charge Trip Threshold
Trickle Charge Trip Hysteresis
Rising
TRIKL
∆V
mV
V
TRIKL
UV
V
V
V
Undervoltage Lockout Voltage
Undervoltage Lockout Hysteresis
V
Rising
CC
4.25
1.3
UV
CC
CC
∆V
200
mV
V
V
V
Manual Shutdown Threshold Voltage
SHDN Pin Voltage
0.6
MSD
ASD
Automatic Shutdown Threshold Voltage (V - V ) High to Low
35
70
mV
mV
CC
BAT
(V - V ) Low to High
CC
BAT
4053fa
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LTC4053-4.2
ELECTRICAL CHARACTERISTICS
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. V = 5V
A
CC
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
1.5
MAX
UNITS
V
V
PROG Pin Voltage
R
= 3k, I
= 500µA
PROG
PROG
CHRG
PROG
CHRG
CHRG
I
CHRG Pin Weak Pulldown Current
CHRG Pin Output Low Voltage
ACPR Pin Output Low Voltage
FAULT Pin Output Low Voltage
End of Charge Indication Current Level
TIMER Accuracy
V
= 1V
15
30
50
0.6
0.6
0.6
56
µA
V
V
V
V
I
I
I
= 5mA
0.35
0.35
0.35
50
CHRG
ACPR
FAULT
C/10
= 5mA
= 5mA
V
ACPR
V
FAULT
I
t
R
PROG
= 3k
44
mA
%
C
= 0.1µF
10
TIMER
TIMER
V
V
V
V
V
V
V
Recharge Battery Voltage Threshold
NTC Pin Hot Threshold Voltage
NTC Pin Hot Hysteresis Voltage
NTC Pin Cold Threshold Voltage
NTC Pin Cold Hystersis Voltage
NTC Pin Disable Threshold Voltage
NTC Pin Disable Hystersis Voltage
Battery Voltage Falling
4.035
2.5
V
RECHRG
NTC-HOT
HOT-HYS
NTC-COLD
COLD-HYS
NTC-DIS
DIS-HYS
LIM
V
V
V
Falling
Rising
Rising
V
NTC
NTC
NTC
80
mV
V
4.375
80
mV
mV
mV
°C
100
10
T
Junction Temperature in
Constant-Temperature Mode
105
R
ON
Power MOSFET “ON” Resistance
375
mΩ
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 2: The Absolute Maximum BAT Current Rating of 1.3A is guaranteed
by design and current density calculations. The Absolute Maximum PROG
Current Rating is guaranteed to be 1/1000 of BAT current rating by design.
Note 3: The LTC4053E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
Note 4: Failure to solder the exposed backside of the package to the PC
board will result in a thermal resistance much higher than 40°C/W.
Note 5: Supply current includes PROG pin current (approximately 50µA)
but does not include any current delivered to the battery through the BAT
pin (approximately 50mA).
4053fa
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LTC4053-4.2
U W
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulation Voltage
vs Battery Charge Current
Battery Regulation Voltage
vs Temperature
Battery Regulation Voltage
vs V
CC
4.22
4.21
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
4.210
4.208
4.206
4.204
4.202
4.200
4.198
4.196
4.194
4.192
4.190
V
T
= 5V
CC
A
R
V
= 5V
PROG
= 10mA
CC
= 25°C
R
= 3k
= 3k
PROG
I
BAT
4.20
4.19
4.18
4.17
4.16
V
= 5V
PROG
= 10mA
CC
R
= 3k
I
BAT
4.06
0
50 100 150 200 250 300 350 400 450 500
(mA)
–50 –25
0
25
125
50
75 100
4
4.5
5.5
(V)
6
6.5
7
5
I
TEMPERATURE (°C)
V
BAT
CC
4053 G01
4053 G02
4053 G03
Charge Current vs Ambient
Temperature with Thermal
Regulation
Charge Current vs Battery Voltage
Charge Current vs Input Voltage
550
500
450
400
350
300
250
200
150
100
50
600
500
400
300
200
100
0
1000
900
800
700
600
500
400
300
200
100
0
T
= 25°C
PROG
V
T
= 5V
A
CC
= 25°C
R
= 3k
A
V
BAT
= 3.95V
R
= 3k
PROG
V
BAT
= 4.05V
THERMAL CONTROL
LOOP IN OPERATION
V
BAT
= 4.15V
4.5
V
V
= 5V
CC
= 3.5V
BAT
R
= 1.5k
PROG
0
4.0
5.0
5.5
2
4
4.5
0
1
1.5
2.5
(V)
3
3.5
0.5
–50 –25
25
50
75
100
0
V
(V)
V
BAT
TEMPERATURE (°C)
CC
4053 G04
4053 G05
4053 G06
Undervoltage Lockout Voltage
vs Temperature
Shutdown Supply Current
vs Temperature
Manual Shutdown Threshold
Voltage vs Temperature
4.05
4.04
4.03
4.02
4.01
4.00
3.99
3.98
3.97
3.96
3.95
1.30
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
0.85
0.80
30
25
20
15
V
SHDN
= 0V
V
V
= 6.5V
= 5.5V
CC
CC
V
= 6V
CC
V
= 5.5V
CC
V
CC
= 4.5V
V
= 5V
CC
10
5
V
= 4.5V
50
CC
0
–50
0
25
50
75 100 125
–25
50
TEMPERATURE (°C)
100 125
–50
0
25
75
125
–50 –25
0
25
75
100
–25
TEMPERATURE (°C)
TEMPERATURE (°C)
4053 G07
4053 G08
4053 G09
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LTC4053-4.2
U W
TYPICAL PERFOR A CE CHARACTERISTICS
PROG Pin Voltage
vs Charge Current
PROG Pin Voltage vs V
PROG Pin Voltage vs Temperature
Constant Current Mode
CC
Constant Current Mode
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
V
V
= 5V
= 4V
PROG
V
T
= 3.5V
= 3k
V
T
= 5V
CC
BAT
R
BAT
CC
A
R
= 25°C
= 25°C
A
= 3k
R
= 3k
PROG
PROG
–50
0
25
50
75
100
4
5
5.5
(V)
6
6.5
7
–25
4.5
0
50 100 150 200 250 300 350 400 450 500
CHARGE CURRENT (mA)
4052 G10
TEMPERATURE (°C)
V
CC
4053 G12
4053 G11
Trickle Charge Current
vs Temperature
CHRG Pin Weak Pull-Down
Current vs Temperature
CHRG Pin Output Low Voltage
vs Temperature
35
34
33
32
31
30
29
28
27
26
25
12
11
10
9
0.6
0.5
0.4
0.3
V
BAT
= 5V
< C/10
V
A
R
= 2V
CC
V
CHRG
= 5V
CC
BAT
= 25°C
I
T
I
= 5mA
= 3k
PROG
0.2
0.1
0
8
7
–50
0
25
50
75 100 125
50
75 100 125
–25
–50 –25
0
25
50
TEMPERATURE (°C)
100 125
–50 –25
0
25
75
TEMPERATURE (°C)
TEMPERATURE (°C)
LTC1323 • TPC05
4053 G13
4053 G15
Timer Error vs Temperature
Timer Error vs V
CC
5
4
5
4
V
C
= 5V
T
= 25°C
CC
TIMER
A
= 0.1µF
C
= 0.1µF
TIMER
3
3
2
2
1
1
0
0
–1
–2
–3
–4
–5
–1
–2
–3
–4
–5
–50
0
25
50
75 100 125
4
4.5
5.5
(V)
6
6.5
7
–25
5
TEMPERATURE (°C)
V
CC
LTC1323 • TPC05
4056 G17
4053fa
5
LTC4053-4.2
U
U
U
PI FU CTIO S
CHRG: Open-Drain Charge Status Output. When the
battery is being charged, the CHRG pin is pulled low by an
internal N-channel MOSFET. When the charge current
drops to 10% of the full-scale current, the N-channel
MOSFET latches off and a 30µA current source is con-
nected from the CHRG pin to ground. The C/10 latch can
be cleared by grounding the SHDN pin, momentarily, or
toggling VCC. When the timer runs out or the input supply
is removed, the current source is disconnected and the
CHRG pin is forced high impedance.
NTC: Input to the NTC (Negative Temperature Coefficient)
Thermistor Temperature Monitoring Circuit. With an ex-
ternal 10kΩ NTC thermistor to ground and a 1% resistor
to VCC, this pin can sense the temperature of the battery
pack and stop charging when it is out of range. When the
voltage at this pin drops below (0.5)•(VCC) at hot tempera-
tures or rises above (0.875)•(VCC) at cold, charging is
suspended and the internal timer is frozen. The CHRG pin
output status is not affected in this hold state. The FAULT
pin will be pulled to ground, but not latched. When the
temperature returns to an acceptable range, charging will
resume and the FAULT pin will be released. The NTC
feature can be disabled by grounding the NTC pin.
VCC: Positive Input Supply Voltage. When VCC is within
35mV of VBAT or less than the undervoltage lockout
threshold, the LTC4053 enters sleep mode, dropping IBAT
to less than 3µA. VCC can range from 4.25V to 6.5V.
Bypass this pin with at least a 4.7µF ceramic capacitor to
ground.
PROG:ChargeCurrentProgramandChargeCurrentMoni-
tor Pin. The charge current is programmed by connecting
a resistor, RPROG to ground. When in constant-current
mode, the LTC4053 servos the PROG pin voltage to 1.5V.
In all modes the voltage on the PROG pin can be used to
measure the charge current as follows:
FAULT:Open-DrainFaultStatusOutput. TheFAULTopen-
drain logic signal indicates that the charger has timed out
under trickle charge conditions or the NTC comparator is
indicating an out-of-range battery temperature condition.
If VBAT is less that 2.48V, trickle charging begins whereby
the charge current drops to one tenth of its programmed
value and the timer period is reduced by a factor of four.
When one fourth of the timing period has elapsed, if VBAT
is still less than 2.48V, trickle charging stops and the
FAULT pin latches to ground. The fault can be cleared by
toggling VCC, momentarily grounding the SHDN pin or
pulling the BAT pin above 2.48V. If the NTC comparator is
indicating an out-of-range battery temperature condition,
the FAULT pin will pull to ground until the temperature
returns to the acceptable range.
IBAT = (VPROG/RPROG) • 1000.
SHDN: Shutdown Input Pin. Pulling the SHDN pin to
ground will put the LTC4053 into standby mode where the
BAT drain current is reduced to less than 3µA, and the
supply current is reduced to less than 25µA. For normal
operation, pull the SHDN pin up to VCC.
BAT: ChargeCurrentOutput. Abypasscapacitorofatleast
1µF with a 1Ω series resistor is required to keep the loop
stable when the battery is not present. A precision internal
resistordividersetsthefinalfloatpotentialonthispin. The
internal resistor divider is disconnected in sleep and
shutdown mode.
TIMER:TimerCapacitor. Thetimerperiodissetbyplacing
a capacitor, CTIMER, to ground. The timer period is:
ACPR: Open-Drain Power Supply Status Output. When
VCC is greater than the undervoltage lockout threshold
and at least 35mV above VBAT, the ACPR pin will pull to
ground. Otherwise, the pin is high impedance.
Time (Hours) = (CTIMER • 3 hr)/(0.1µF)
ShorttheTIMERpintogroundtodisabletheinternaltimer
function.
GND:Ground.Theexposedbacksideofthepackageisalso
ground and must be soldered to the PC board for maxi-
mum heat transfer.
4053fa
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LTC4053-4.2
W
W
SI PLIFIED BLOCK DIAGRA
V
CC
2
105°C
–
D1
TA
D2
D3
T
+
DIE
M2
×1
M1
×1000
+
–
MA
BAT
9
30µA
R1
R2
NTC
6
NTC
MP
+
–
VA
CA
+
–
2.485V
REF
HOT COLD DISABLE
1
CHRG
STOP
SHDN
8
SHDN
C/10
R3
R4
R5
30µA
1.5V
LOGIC
10
3
ACPR
ACPR
0.15V
+
–
C2
C/10
FAULT
FAULT
CHARGE
COUNTER
OSCILLATOR
4
C3
+
–
2.485V
TO BAT
7
5
4053 BD
PROG
GND
TIMER
R
PROG
C
TIMER
Figure 1
4053fa
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LTC4053-4.2
U
OPERATIO
TheLTC4053isalinearbatterychargerdesignedprimarily
for charging single cell lithium-ion batteries. Featuring an
internal P-channel power MOSFET, the charger uses a
constant-current/constant-voltage charge algorithm with
programmable current and a programmable timer for
charge termination. Charge current can be programmed
up to 1.25A with a final float voltage accuracy of ±1%. No
blocking diode or sense resistor is required thus dropping
the external component count to three for the basic
charger circuit. The CHRG, ACPR, and FAULT open-drain
status outputs provide information regarding the status of
the LTC4053 at all times. An NTC thermistor input pro-
vides the option of charge qualification using battery
temperature.
voltage up to a safe level for charging. The charger goes
into the fast charge constant-current mode once the
voltage on the BAT pin rises above 2.48V. In constant-
current mode, the charge current is set by RPROG
.
When the battery approaches the final float voltage, the
charge current begins to decrease as the LTC4053 enters
the constant-voltage mode. When the current drops to
10% of the full-scale charge current, an internal compara-
tor latches off the MOSFET on the CHRG pin and connects
a weak current source to ground (30µA) to indicate a near
end-of-charge (C/10) condition. The C/10 latch can be
cleared by grounding the SHDN pin momentarily, or
momentarily removing and reapplying VCC.
An external capacitor on the TIMER pin sets the total
charge time. When this time elapses, the charge cycle
terminates and the CHRG pin assumes a high impedance
state. Torestartthechargecycle, removetheinputvoltage
and reapply it, or momentarily force the SHDN pin to 0V.
ThechargecyclewillalsorestartiftheBATpinvoltagefalls
below the recharge threshold.
An internal thermal limit reduces the programmed charge
current if the die temperature attempts to rise above a
presetvalueofapproximately105°C. Thisfeatureprotects
the LTC4053 from excessive temperature, and allows the
user to push the limits of the power handling capability of
agivencircuitboardwithoutriskofdamagingtheLTC4053
ortheexternalcomponents.AnotherbenefitoftheLTC4053
thermal limit is that charge current can be set according to
typical, not worst-case, ambient temperatures for a given
application with the assurance that the charger will auto-
matically reduce the current in worst-case conditions.
For lithium-ion and similar batteries that require an accu-
rate final float voltage, the internal reference, voltage
amplifier and the resistor divider provide regulation with
±1% (max) accuracy.
When the input voltage is not present, the charger goes
into a sleep mode, dropping battery drain current, IBAT, to
lessthan5µA.Thisgreatlyreducesthecurrentdrainonthe
batteryandincreasesthestandbytime.Thechargercanbe
shut down (ICC = 25µA) by forcing the SHDN pin to 0V.
The charge cycle begins when the voltage at the VCC pin
rises above the UVLO level, a program resistor is con-
nected from the PROG pin to ground, and the SHDN pin is
pulled above the shutdown threshold. At the beginning of
the charge cycle, if the battery voltage is below 2.48V, the
charger goes into trickle charge mode to bring the cell
4053fa
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LTC4053-4.2
U
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APPLICATIO S I FOR ATIO
Undervoltage Lockout (UVLO)
For example, if 500mA charge current is required,
calculate:
Aninternalundervoltagelockoutcircuitmonitorstheinput
voltageandkeepsthechargerinshutdownmodeuntilVCC
risesabovetheundervoltagelockoutthreshold. TheUVLO
circuit has a built-in hysteresis of 150mV. Furthermore, to
protect against reverse current in the power MOSFET, the
UVLO circuit keeps the charger in shutdown mode if VCC
falls to within 35mV of the battery voltage. If the UVLO
comparator is tripped, the charger will not come out of
shutdown until VCC rises 70mV above the battery voltage.
RPROG = 1500V/0.5A = 3kΩ
For best stability over temperature and time, 1% metal-
film resistors are recommended.
If the charger is in constant-temperature or constant-
voltage mode, the battery current can be monitored by
measuring the PROG pin voltage as follows:
ICHG = (VPROG / RPROG) • 1000
Trickle Charge And Defective Battery Detection
USB and Wall Adapter Power
At the beginning of a charge cycle, if the battery voltage is
low (below 2.48V) the charger goes into trickle charge
reducing the charge current to 10% of the full-scale
current. If the low battery voltage persists for one quarter
of the total charge time, the battery is assumed to be
defective, the charge cycle is terminated, the CHRG pin
output assumes a high impedance state, and the FAULT
pin pulls low. The fault can be cleared by toggling VCC,
temporarily forcing the SHDN pin to 0V, or temporarily
forcing the BAT pin voltage above 2.48V.
Although the LTC4053 allows charging from a USB port,
a wall adapter can also be used to charge Li-Ion batteries.
Figure2showsanexampleofhowtocombinewalladapter
and USB power inputs. A P-channel MOSFET, MP1, is
used to prevent back conducting into the USB port when
a wall adapter is present and Schottky diode, D1, is used
to prevent USB power loss through the 1k pull-down
resistor.
Typically a wall adapter can supply significantly more
currentthanthe500mA-limitedUSBport.Therefore,anN-
channel MOSFET, MN1 and an extra 3k program resistor
can be used to increase the charge current to 1A when the
wall adapter is present.
Shutdown
The LTC4053 can be shut down (ICC = 25µA) by pulling the
SHDN pin to 0V. For normal operation, pull the SHDN pin
above the manual shutdown threshold voltage level. Do
not leave this pin open. In shutdown the internal linear
regulator is turned off, and the internal timer is reset.
5V WALL
ADAPTER
I
CHG
LTC4053
1A I
CHG
9
7
SYSTEM
LOAD
D1
2
BAT
USB
POWER
Programming Charge Current
V
CC
MP1
500mA I
CHG
+
PROG
The formula for the battery charge current (see Figure 1)
is:
Li-Ion
BATTERY
3k
1k
3k
MN1
ICHG = (IPROG) • 1000
= (1.5V / RPROG) • 1000 or
RPROG = 1500V/ICHG
4053 F02
Figure 2. Combining Wall Adapter and USB Power
where RPROG is the total resistance from the PROG pin to
ground. Under trickle charge conditions, this current is
reduced to 10% of the full-scale value.
4053fa
9
LTC4053-4.2
W U U
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APPLICATIO S I FOR ATIO
Table 1.
FAULT
High
Programming The Timer
CHRG
Description
The programmable timer is used to terminate the charge
cycle. The timer duration is programmed by an external
capacitor at the TIMER pin. The total charge time is:
Low
Charge cycle has started, C/10 has not been
reached and charging is proceeding normally.
Low
Low
Charge cycle has started, C/10 has not been
reached, but the charge current and timer
have been paused due to an NTC out-of-
temperature condition.
Time (Hours) = (3 Hours) • (CTIMER/0.1µF) or
CTIMER = 0.1µF • Time (Hours)/3 (Hours)
High
Low
30µA
C/10 has been reached and charging is
The timer starts when an input voltage greater than the
undervoltage lockout threshold level is applied and the
SHDN pin is greater than the manual shutdown threshold
voltage level. After a time-out occurs, the charge current
stops, and the CHRG output assumes a high impedance
state to indicate that the charging has stopped. Connect-
ing the TIMER pin to ground disables the timer function.
pull-down proceeding normally.
30µA
C/10 has been reached but the charge current
pull-down and timer have paused due to an NTC out-of-
temperature condition.
High
Low
High
High
Normal timeout (charging has terminated).
If FAULT goes low and CHRG goes high
impedance simultaneously, then the LTC4053
has timed out due to a bad cell (V
<2.48V
BAT
Recharge
after one-quarter the programmed charge time).
If CHRG goes high impedance first, then
the LTC4053 has timed out normally (charging
has terminated), but NTC is indicating an out-
of-temperature condition.
After a charge cycle has terminated, if the battery voltage
dropsbelowtherechargethresholdof4.05Vanewcharge
cycle will begin. The recharge circuit integrates the BAT
pin voltage for a few milliseconds to prevent a transient
from restarting the charge cycle.
CHRG Status Output Pin
If the battery voltage remains below 2.48V during trickle
chargefor1/4oftheprogrammedtime, thebatterymaybe
defective and the charge cycle will end. In addition, the
recharge comparator is disabled and a new charge cycle
will not begin unless the input voltage is toggled off-then-
on, the SHDN pin is momentarily pulled to ground, or the
BATpinispulledabovethe2.48Vtricklechargethreshold.
When the charge cycle starts, the CHRG pin is pulled to
ground by an internal N-channel MOSFET capable of
driving an LED. When the charge current drops to 10% of
the full-scale current (C/10), the N-channel MOSFET is
latched off and a weak 30µA current source to ground is
connected to the CHRG pin. After a time-out occurs,
the pin assumes a high impedance state. By using two
different value pull-up resistors a microprocessor can
detect three states from this pin (charging, C/10 and time-
out). See Figure 3.
Open-Drain Status Outputs
The LTC4053 has three open-drain status outputs: ACPR,
CHRG and FAULT. The ACPR pin pulls low when an input
voltage greater than the undervoltage lockout threshold is
applied and becomes high impedance when power (VIN <
VUV) is removed. CHRG and FAULT work together to
indicate the status of the charge cycle. Table 1 describes
the status of the charge cycle based on the CHRG and
FAULT outputs.
When the LTC4053 is in charge mode, the CHRG pin is
pulled low by the internal N-channel MOSFET. To detect
this mode, force the digital output pin, OUT, high and
measure the voltage at the CHRG pin. The N-channel
MOSFET will pull the pin low even with the 2k pull-up
resistor. Once the charge current drops to 10% of the
4053fa
10
LTC4053-4.2
W U U
APPLICATIO S I FOR ATIO
U
+
V
V
CC
V
DD
7/8 V
1/2 V
–
+
CC
CC
CC
8
R
HOT
1%
TOO COLD
TOO HOT
V
CC
400k
LTC4053
CHRG
µPROCESSOR
2k
3
OUT
NTC
IN
R
+
–
NTC
10k
4053 F03
Figure 3. Microprocessor Interface
3/160 V
+
–
full-scale current (C/10), the N-channel MOSFET is turned
off and a 30µA current source is connected to the CHRG
pin. The IN pin will then be pulled high by the 2k pull-up.
By forcing the OUT pin to a high impedance state, the
current source will pull the pin low through the 400k
resistor. When the internal timer has expired, the CHRG
pin will assume a high impedance state and the 400k
resistor will then pull the pin high to indicate that charging
has terminated.
DISABLE NTC
LTC4053
4053 F04
Figure 4
Thermistors
The LTC4053 NTC trip points were designed to work with
thermistors whose resistance-temperature characteris-
tics follow Vishay Dale’s “R-T Curve 2”. The Vishay
NTHS0603N02N1002J is an example of such a ther-
mistor. However, Vishay Dale has many thermistor prod-
uctsthatfollowthe“R-TCurve2”characteristicinavariety
of sizes. Futhermore, any thermistor whose ratio of RCOLD
to RHOT is about 7.0 will also work (Vishay Dale R-T Curve
2 shows a ratio of RCOLD to RHOT of 2.816/0.4086 = 6.9).
NTC Thermistor
Thebatterytemperatureismeasuredbyplacinganegative
temperature coefficient (NTC) thermistor close to the
batterypack.TheNTCcircuitryisshowninFigure4.Touse
this feature, connect a 10k NTC thermistor between the
NTCpinandgroundandaresistor(RHOT)fromtheNTCpin
to VCC. RHOT should be a 1% resistor with a value equal to
the value of the chosen NTC thermistor at 50°C (this value
is 4.1k for a Vishay NTHS0603N02N1002J thermistor).
The LTC4053 goes into hold mode when the resistance of
the NTC thermistor drops below 4.1k which should be
approximately 50°C. The hold mode freezes the timer and
stops the charge cycle until the thermistor indicates a
return to a valid temperature. As the temperature drops,
the resistance of the NTC thermistor rises. The LTC4053
isdesignedtogointoholdmodewhenthevalueoftheNTC
thermistor increases to seven times the value of RHOT. For
a Vishay NTHS0603N02N1002J thermistor, this value is
28.7k which corresponds to approximately 0°C. The hot
and cold comparators each have approximately 2°C of
hysteresis to prevent oscillation about the trip point. The
NTC function can be disabled by grounding the NTC pin.
NTC Layout Considerations
It is important that the NTC thermistor not be in close
thermal contact with the LTC4053. Because the LTC4053
package can reach temperatures in excess of the 50°C trip
point, the NTC function can cause a hysteretic oscillation
which turns the charge current on and off according to the
package temperature rather than the battery temperature.
This problem can be eliminated by thermally coupling the
NTC thermistor to the battery and not to the LTC4053.
Furthermore, it is essential that the VCC connection to
RHOT is made according to standard Kelvin sense tech-
niques. Since VCC is a high current path into the LTC4053,
it is essential to minimize voltage drops between the VCC
input pin and the top of RHOT
.
4053fa
11
LTC4053-4.2
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APPLICATIO S I FOR ATIO
NTC Trip Point Errors
Constant-Current/Constant-Voltage/
Constant-Temperature
When a 1% resistor is used for RHOT, the major error in
the 50°C trip point is determined by the tolerance of
the NTC thermistor. A typical 10k NTC thermistor has
The LTC4053 uses a unique architecture to charge a
battery in a constant-current, constant-voltage, constant-
temperature fashion. Figure 1 shows a simplified block
diagram of the LTC4053. Three of the amplifier feedback
loops shown control the constant-current, CA, constant-
voltage, VA, and constant-temperature, TA modes. A
fourth amplifier feedback loop, MA, is used to increase the
output impedance of the current source pair, M1 and M2
(note that M1 is the internal P-channel power MOSFET). It
ensures that the drain current of M1 is exactly 1000 times
greater than the drain current of M2.
a
±10% tolerance. By looking up the temperature
coefficient of the thermistor at 50°C, the tolerance error
can be calculated in degrees centigrade. Consider the
Vishay NTHS0603N02N1002J thermistor which has a
temperature coefficient of –3.3%/°C at 50°C. Dividing
the tolerance by the temperature coefficient, ±10%/
(3.3%/°C) = ±3°C, gives the temperature error of the hot
trip point.
The cold trip point is a little more complicated because its
error depends on the tolerance of the NTC thermistor and
thedegreetowhichtheratioofitsvalueat0°Canditsvalue
at 50°C varies from 7 to 1. Therefore, the cold trip point
error can be calculated using the tolerance, TOL, the
temperature coefficient of the thermistor at 0°C, TC
(in %/°C), the value of the thermistor at 0°C, RCOLD, and
the value of the thermistor at 50°C, RHOT. The formula is:
Amplifiers CA, TA, and VA are used in three separate
feedback loops to force the charger into constant-current,
temperature, or voltage mode, respectively. Diodes, D1,
D2, and D3 provide priority to whichever loop is trying to
reduce the charge current the most. The outputs of the
other two amplifiers saturate low which effectively re-
moves their loops from the system. When in constant-
current mode, CA servos the voltage at the PROG pin to be
precisely 1.50V (or 0.15V when in trickle-charge mode).
TA limits the die temperature to approximately 105°C
when in constant-temperature mode and the PROG pin
voltage gives an indication of the charge current as dis-
cussed in “Programming Charge Current”. VA servos its
inverting input to precisely 2.485V when in constant-
voltage mode and the internal resistor divider made up of
R1 and R2 ensures that the battery voltage is maintained
at 4.2V. Again, the PROG pin voltage gives an indication of
the charge current.
⎛
⎞
1+ TOL RCOLD
•
– 1 •100
⎜
⎟
7
RHOT
TC
⎝
⎠
TemperatureError(°C)=
Forexample,theVishayNTHS0603N02N1002Jthermistor
with a tolerance of ±10%, TC of –4.5%/°C, and RCOLD
/
RHOT of 6.89, has a cold trip point error of:
⎛
⎞
1± 0.10
•6.89 – 1 •100
⎜
⎟
7
⎝
⎠
Temperature Error (°C) =
In typical operation, the charge cycle begins in constant-
current mode with the current delivered to the battery
equal to 1500V/RPROG. If the power dissipation of the
LTC4053 results in the junction temperature approaching
105°C, the amplifier (TA) will begin decreasing the charge
current to limit the die temperature to approximately
105°C. As the battery voltage rises, the LTC4053 either
returns to constant-current mode or it enters constant-
voltage mode straight from constant-temperature mode.
–4.5
= –1.8°C, +2.5°C
Ifathermistorwithatolerancelessthan±10%isused, the
trip point errors begin to depend on errors other than
thermistor tolerance including the input offset voltage of
theinternalcomparatorsoftheLTC4053andtheeffectsof
internal voltage drops due to high charging currents.
4053fa
12
LTC4053-4.2
W U U
APPLICATIO S I FOR ATIO
U
Regardless of mode, the voltage at the PROG pin is
proportional to the current being delivered to the battery.
Furthermore, the voltage at the PROG pin will change
proportionally with the charge current as discussed in the
Programming Charge Current section.
Power Dissipation
It is important to remember that LTC4053 applications do
notneedtobedesignedforworst-casethermalconditions
since the IC will automatically reduce power dissipation
when the junction temperature reaches approximately
105°C.
The conditions that cause the LTC4053 to reduce charge
current due to the thermal protection feedback can be
approximated by considering the power dissipated in the
IC. For high charge currents, the LTC4053 power dissipa-
tion is approximately:
Board Layout Considerations
PD = (VCC – VBAT) • IBAT
The ability to deliver maximum charge current under all
conditions require that the exposed metal pad on the
backside of the LTC4053 package be soldered to the PC
board ground. Correctly soldered to a 2500mm2 double-
sided 1oz. copper board the LTC4053 has a thermal
resistance of approximately 40°C/W. Failure to make
thermal contact between the exposed pad on the backside
of the package and the copper board will result in thermal
resistances far greater than 40°C/W. As an example, a
correctly soldered LTC4053 can deliver over 1250mA to a
battery from a 5V supply at room temperature. Without a
backside thermal connection, this number could drop to
less than 500mA.
where PD is the power dissipated, VCC is the input supply
voltage, VBAT is the battery voltage, and IBAT is the battery
charge current. It is not necessary to perform any worst-
case power dissipation scenarios because the LTC4053
will automatically reduce the charge current to maintain
the die temperature at approximately 105°C. However, the
approximate ambient temperature at which the thermal
feedback begins to protect the IC is:
TA = 105°C – PDθJA
TA = 105°C – (VCC – VBAT) • IBAT • θJA
Example: Consider an LTC4053 operating from a 5V wall
adapter providing 1.2A to a 3.75V Li-Ion battery. The
ambient temperature above which the LTC4053 will begin
to reduce the 1.2A charge current is approximately:
VCC Bypass Capacitor
Many types of capacitors can be used for input bypassing.
However, caution must be exercised when using multi-
layer ceramic capacitors. Because of the self resonant and
high Q characteristics of some types of ceramic capaci-
tors, high voltage transients can be generated under some
start-up conditions, such as connecting the charger input
to a hot power source. For more information refer to
Application Note 88.
TA = 105°C – (5V – 3.75V) • 1.2A • 40°C/W
TA = 105°C – 1.5W • 40°C/W = 105°C – 60°C = 45°C
The LTC4053 can be used above 45°C, but the charge
current will be reduced below 1.2A. The approximate
charge current at a given ambient temperature can be
approximated by:
105°C – TA
(VCC – VBAT )•θJA
Stability
IBAT
=
The constant-voltage mode feedback loop is stable
without any compensation provided that a battery is
connected. However, a 1µF capacitor with a 1Ω series
resistor to GND is recommended at the BAT pin to keep
ripple voltage low when the battery is disconnected.
Consider the above example with an ambient temperature
of 55°C. The charge current will be reduced to approxi-
mately:
105°C – 55°C
(5V – 3.75V)•40°C / W 50°C /A
50°C
In the constant-current mode it is the PROG pin that is in
the feedback loop and not the battery. The constant-
IBAT
=
=
= 1A
current mode stability is affected by the impedance at the
4053fa
13
LTC4053-4.2
W U U
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APPLICATIO S I FOR ATIO
PROG pin. With no additional capacitance on the PROG
pin, stability is acceptable with program resistor values as
high as 50k. However, additional capacitance on this node
reduces the maximum allowed program resistor. The pole
frequency at the PROG pin should be kept above 500kHz.
Therefore, if the PROG pin is loaded with a capacitance, C,
the following equation should be used to calculate the
Average, rather than instantaneous, battery current may
beofinteresttotheuser.Forexample,ifaswitchingpower
supply operating in low-current mode is connected in
parallel with the battery the average current being pulled
out of the BAT pin is typically of more interest than the
instantaneous current pulses. In such a case, a simple RC
filter can be used on the PROG pin to measure the average
battery current as shown in Figure 5. A 10k resistor is
added between the PROG pin and the filter capacitor and
monitoring circuit to ensure stability.
maximum resistance value for RPROG
:
RPROG < 1/(6.283 • 5 × 105 • C)
LTC4053
PROG
CHARGE
10k
7
CURRENT
MONITOR
CIRCUITRY
R
PROG
C
FILTER
GND
5
4053 F05
Figure 5. Isolating Capacitive Load on PROG Pin and Filtering
U
PACKAGE DESCRIPTIO
DD Package
10-Lead Plastic DFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115
TYP
6
0.38 ± 0.10
10
0.675 ±0.05
3.50 ±0.05
2.15 ±0.05 (2 SIDES)
1.65 ±0.05
3.00 ±0.10
(4 SIDES)
1.65 ± 0.10
(2 SIDES)
PIN 1
TOP MARK
(SEE NOTE 6)
PACKAGE
OUTLINE
(DD10) DFN 1103
5
1
0.25 ± 0.05
0.50 BSC
0.75 ±0.05
0.200 REF
0.25 ± 0.05
0.50
BSC
2.38 ±0.10
(2 SIDES)
2.38 ±0.05
(2 SIDES)
0.00 – 0.05
BOTTOM VIEW—EXPOSED PAD
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-2).
CHECK THE LTC WEBSITE DATA SHEET FOR CURRENT STATUS OF VARIATION ASSIGNMENT
2. DRAWING NOT TO SCALE
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4053fa
14
LTC4053-4.2
U
PACKAGE DESCRIPTIO
MSE Package
10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1663)
BOTTOM VIEW OF
EXPOSED PAD OPTION
2.06 ± 0.102
(.081 ± .004)
1.83 ± 0.102
(.072 ± .004)
2.794 ± 0.102
(.110 ± .004)
0.889 ± 0.127
(.035 ± .005)
1
5.23
(.206)
MIN
2.083 ± 0.102 3.2 – 3.45
(.082 ± .004) (.126 – .136)
10
0.50
(.0197)
BSC
0.305 ± 0.038
(.0120 ± .0015)
TYP
3.00 ± 0.102
(.118 ± .004)
(NOTE 3)
0.497 ± 0.076
(.0196 ± .003)
REF
10 9
8
7 6
RECOMMENDED SOLDER PAD LAYOUT
3.00 ± 0.102
(.118 ± .004)
NOTE 4
4.90 ± 0.15
(1.93 ± .006)
DETAIL “A”
0.254
(.010)
0° – 6° TYP
1
2
3
4 5
GAUGE PLANE
0.53 ± 0.01
(.021 ± .006)
0.86
(.034)
REF
1.10
(.043)
MAX
DETAIL “A”
0.18
(.007)
SEATING
PLANE
0.17 – 0.27
(.007 – .011)
TYP
0.13 ± 0.076
(.005 ± .003)
MSOP (MSE) 0802
0.50
(.0197)
BSC
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
4053fa
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 represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
15
LTC4053-4.2
U
TYPICAL APPLICATIO S
USB/Wall Adapter Power Li-Ion Battery Charger
5V WALL
ADAPTER
I
LTC4053-4.2
BAT
BAT
9
+
Li-Ion
CELL
2
1µF
1Ω
USB
POWER
V
CC
4.7µF
4
8
SUSPEND
TIMER
SHDN
1k
GND NTC PROG
µC
5
6
7
3.74k
100mA/
500mA
0.1µF
15k
4053 F06
Li-Ion Battery Charger with Reverse Polarity Input Protection
Full Featured Single Cell Li-Ion Charger
V
= 5V
IN
I
= 1A
BAT
LTC4053-4.2
9
5V WALL
ADAPTER
2
8
1k
1k
V
BAT
CC
8
2
1k
1-CELL
Li-Ion
+
SHDN
V
CC
SHDN
10
3
4k
BATTERY
ACPR
1%
4.7µF
1
6
4
4
7
CHRG
LTC4053-4.2
FAULT
TIMER
GND
PROG
4.7µF
I
= 500mA
BAT
NTC
6
9
1.5k
1%
NTC
BAT
5
0.1µF
1µF
7
TIMER
GND
PROG
R
Li-Ion
CELL
4053 F07
NTC
10k
3k
1%
1Ω
5
0.1µF
4053 F08
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Simple ThinSOT Charger, No Blocking Diode, No Sense Resistor Needed
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Standalone Lithium-Ion Linear Battery Charger
Controller in ThinSOT
Up to 700mA Charge Current, Charge Termination, Continuous Charging with
Poorly Regulated or High Impedance Input Supplies
ThinSOT is a trademark of Linear Technology Corporation.
4053fa
LT/LT 0705 REV A • PRINTED IN USA
LinearTechnology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
16
●
●
© LINEAR TECHNOLOGY CORPORATION 2001
(408) 432-1900 FAX: (408) 434-0507 www.linear.com
相关型号:
LTC4053EMSE-4.2#PBF
LTC4053-4.2 - USB Compatible Lithium-Ion Battery Charger with Thermal Regulation; Package: MSOP; Pins: 10; Temperature Range: -40°C to 85°C
Linear
LTC4053EMSE-4.2#TR
LTC4053-4.2 - USB Compatible Lithium-Ion Battery Charger with Thermal Regulation; Package: MSOP; Pins: 10; Temperature Range: -40°C to 85°C
Linear
LTC4054ES5-4.2#PBF
LTC4054-4.2 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C
Linear
LTC4054ES5-4.2#TR
LTC4054-4.2 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C
Linear
LTC4054ES5-4.2#TRM
LTC4054-4.2 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation in ThinSOT; Package: SOT; Pins: 5; Temperature Range: -40°C to 85°C
Linear
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