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LTC4053-4.2
1
4053fa
Cellular Telephones
Handheld Computers
Charging Docks and Cradles
MP3 Players
Digital Cameras
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
C/10 Charge Current Detection Output
AC Present Logic Output
25
A Supply Current in Shutdown Mode
Automatic Recharge
Charge Current Monitor Useful for Gas Gauging
Thermistor Input for Temperature Qualified Charging
Available in 10-pin thermally enhanced MSOP and
low profile (0.75mm) 3mm
3mm DFN packages
USB Compatible
Lithium-Ion Battery Charger
with Thermal Regulation
The LTC
4053 is a standalone linear charger for lithium-
ion batteries that can be powered directly from a USB port.
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
to limit die temperature during high power or high ambient
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.
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 5
A.
The LTC4053 also includes NTC temperature sensing,
C/10 detection circuitry, AC present logic, low battery
charge conditioning (trickle charging) and shutdown (25
A
supply current).
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.
USB PORT
4.35V TO 5.5V
4.7
F
4053TA01
4
2
USB CONTROL
C
Li-Ion
BATTERY
SYSTEM
LOAD
+
0.1
F
15k
100mA/
500mA
SUSPEND
3.74k
SHDN
V
CC
GND NTC
9
8
7
5
6
PROG
LTC4053-4.2
BAT
TIMER
USB Powered Standalone Li-Ion Charger
Protected by U.S. Patents including 6522118, 6700364.
Charge Current vs Input Voltage
V
CC
(V)
4.0
I
BAT
(mA)
600
500
400
300
200
100
0
4.5
5.0
4053 G04
5.5
T
A
= 25
C
R
PROG
= 3k
V
BAT
= 3.95V
V
BAT
= 4.15V
V
BAT
= 4.05V
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
LTC4053-4.2
2
4053fa
Input Supply Voltage (V
CC
) ....................................... 7V
BAT ........................................................................... 7V
NTC, SHDN, TIMER, PROG ............ 0.3V to V
CC
+ 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
ABSOLUTE AXI U
RATI GS
W
W
W
U
PACKAGE/ORDER I FOR ATIO
U
U
W
(Note 1)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ORDER PART
NUMBER
LTC4053EDD-4.2
T
JMAX
= 125
C,
JA
= 40
C/W (NOTE 4)
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
1
2
3
4
5
CHRG
V
CC
FAULT
TIMER
GND
10
9
8
7
6
ACPR
BAT
SHDN
PROG
NTC
TOP VIEW
11
MSE EXPOSED PAD PACKAGE
10-LEAD PLASTIC MSOP
DD PART MARKING
LBQC
Junction Temperature .......................................... 125
C
Operating Temperature Range (Note 3) ...40
C to 85C
Storage Temperature Range
MSE .................................................. 65
C to 150C
DD .................................................... 65
C to 125C
Lead Temperature (Soldering, 10 sec)
MSE .................................................................. 300
C
ORDER PART
NUMBER
LTC4053EMSE-4.2
MSE PART MARKING
LTZT
TOP VIEW
11
DD PACKAGE
10-LEAD (3mm
3mm) PLASTIC DFN
10
9
6
7
8
4
5
3
2
1
ACPR
BAT
SHDN
PROG
NTC
CHRG
V
CC
FAULT
TIMER
GND
T
JMAX
= 125
C,
JA
= 40
C/W (NOTE 4)
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
ELECTRICAL CHARACTERISTICS
The
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
C. V
CC
= 5V
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
V
CC
Supply Voltage
4.25
6.5
V
I
CC
V
CC
Supply Current
Charger On; Current Mode; R
PROG
= 30k (Note 5)
1
2
mA
Shutdown Mode; V
SHDN
= 0V
25
50
A
Sleep Mode V
CC
< V
BAT
or V
CC
4V
25
50
A
V
BAT
V
BAT
Regulated Float Voltage
4.158
4.2
4.242
V
I
BAT
Battery Pin Current
R
PROG
= 3k; Current Mode
465
500
535
mA
R
PROG
= 15k; Current Mode
93
100
107
mA
Shutdown Mode; V
SHDN
= 0V
1
3
A
Sleep Mode V
CC
< V
BAT
or V
CC
< (V
UV
V
UV
)
1
3
A
I
TRIKL
Trickle Charge Current
V
BAT
< 2V; R
PROG
= 3k
35
50
65
mA
V
TRIKL
Trickle Charge Trip Threshold
V
BAT
Rising
2.48
V
V
TRIKL
Trickle Charge Trip Hysteresis
100
mV
V
UV
V
CC
Undervoltage Lockout Voltage
V
CC
Rising
4
4.25
V
V
UV
V
CC
Undervoltage Lockout Hysteresis
200
mV
V
MSD
Manual Shutdown Threshold Voltage
SHDN Pin Voltage
0.6
1.3
V
V
ASD
Automatic Shutdown Threshold Voltage (V
CC
- V
BAT
) High to Low
35
mV
(V
CC
- V
BAT
) Low to High
70
mV
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/
LTC4053-4.2
3
4053fa
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 70C. Specifications over the 40C to 85C operating
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
PROG
PROG Pin Voltage
R
PROG
= 3k, I
PROG
= 500
A
1.5
V
I
CHRG
CHRG Pin Weak Pulldown Current
V
CHRG
= 1V
15
30
50
A
V
CHRG
CHRG Pin Output Low Voltage
I
CHRG
= 5mA
0.35
0.6
V
V
ACPR
ACPR Pin Output Low Voltage
I
ACPR
= 5mA
0.35
0.6
V
V
FAULT
FAULT Pin Output Low Voltage
I
FAULT
= 5mA
0.35
0.6
V
I
C/10
End of Charge Indication Current Level
R
PROG
= 3k
44
50
56
mA
t
TIMER
TIMER Accuracy
C
TIMER
= 0.1
F
10
%
V
RECHRG
Recharge Battery Voltage Threshold
Battery Voltage Falling
4.035
V
V
NTC-HOT
NTC Pin Hot Threshold Voltage
V
NTC
Falling
2.5
V
V
HOT-HYS
NTC Pin Hot Hysteresis Voltage
80
mV
V
NTC-COLD
NTC Pin Cold Threshold Voltage
V
NTC
Rising
4.375
V
V
COLD-HYS
NTC Pin Cold Hystersis Voltage
80
mV
V
NTC-DIS
NTC Pin Disable Threshold Voltage
V
NTC
Rising
100
mV
V
DIS-HYS
NTC Pin Disable Hystersis Voltage
10
mV
T
LIM
Junction Temperature in
105
C
Constant-Temperature Mode
R
ON
Power MOSFET "ON" Resistance
375
m
temperature range are assured by design, characterization and correlation
with statistical process controls.
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 50
A)
but does not include any current delivered to the battery through the BAT
pin (approximately 50mA).
ELECTRICAL CHARACTERISTICS
The
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25
C. V
CC
= 5V
LTC4053-4.2
4
4053fa
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
Battery Regulation Voltage
vs Battery Charge Current
I
BAT
(mA)
4.16
V
BAT
(V)
4.18
4.20
4.22
4.17
4.19
4.21
100
200
300
400
4053 G01
500
50
0
150
250
350
450
V
CC
= 5V
T
A
= 25
C
R
PROG
= 3k
TEMPERATURE (
C)
50
4.06
V
BAT
(V)
4.08
4.12
4.14
4.16
50
4.24
4053 G02
4.10
0
25
75
100
25
125
4.18
4.20
4.22
V
CC
= 5V
R
PROG
= 3k
I
BAT
= 10mA
V
CC
(V)
4
V
BAT
(V)
4.5
5
5.5
6
4053 G03
6.5
4.210
4.208
4.206
4.204
4.202
4.200
4.198
4.196
4.194
4.192
4.190
7
V
CC
= 5V
R
PROG
= 3k
I
BAT
= 10mA
Battery Regulation Voltage
vs Temperature
Battery Regulation Voltage
vs V
CC
Charge Current vs Input Voltage
Charge Current vs Battery Voltage
Charge Current vs Ambient
Temperature with Thermal
Regulation
V
CC
(V)
4.0
I
BAT
(mA)
600
500
400
300
200
100
0
4.5
5.0
4053 G04
5.5
T
A
= 25
C
R
PROG
= 3k
V
BAT
= 3.95V
V
BAT
= 4.15V
V
BAT
= 4.05V
V
BAT
(V)
0
I
BAT
(mA)
150
450
500
550
1
2
2.5
4053 G05
50
350
250
100
400
0
300
200
0.5
1.5
3.5
4.5
3
4
V
CC
= 5V
T
A
= 25
C
R
PROG
= 3k
TEMPERATURE (
C)
50
0
I
BAT
(mA)
200
400
600
25
0
25
50
4053 G06
75
800
1000
100
300
500
700
900
100
THERMAL CONTROL
LOOP IN OPERATION
V
CC
= 5V
V
BAT
= 3.5V
R
PROG
= 1.5k
Undervoltage Lockout Voltage
vs Temperature
Shutdown Supply Current
vs Temperature
Manual Shutdown Threshold
Voltage vs Temperature
TEMPERATURE (
C)
50
V
UV
(V)
3.95
3.97
3.98
3.99
4.05
4.02
0
50
75
4053 G07
3.96
4.03
4.04
4.01
4.00
25
25
100
125
TEMPERATURE (
C)
50
I
CC
(
A)
20
25
30
25
75
4053 G08
15
10
25
0
50
100
125
5
0
V
SHDN
= 0V
V
CC
= 6.5V
V
CC
= 5.5V
V
CC
= 4.5V
TEMPERATURE (
C)
50
V
MSD
(V)
0.80
0.90
0.95
1.00
1.30
1.15
0
50
75
4053 G09
0.85
1.20
1.25
1.10
1.05
25
25
100
125
V
CC
= 6V
V
CC
= 5.5V
V
CC
= 4.5V
V
CC
= 5V
LTC4053-4.2
5
4053fa
TYPICAL PERFOR A CE CHARACTERISTICS
U
W
PROG Pin Voltage
vs Charge Current
PROG Pin Voltage vs V
CC
Constant Current Mode
PROG Pin Voltage vs Temperature
Constant Current Mode
CHARGE CURRENT (mA)
0
V
PROG
(V)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
400
4052 G10
100
200
300
500
350
50
150
250
450
V
CC
= 5V
T
A
= 25
C
R
PROG
= 3k
V
CC
(V)
4
1.485
V
PROG
(V)
1.490
1.495
1.500
1.505
1.515
4.5
5
5.5
6
4053 G11
6.5
7
1.510
V
BAT
= 3.5V
T
A
= 25
C
R
PROG
= 3k
TEMPERATURE (
C)
50
1.485
V
PROG
(V)
1.490
1.495
1.500
1.505
1.515
25
0
25
50
4053 G12
75
100
1.510
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 3k
Trickle Charge Current
vs Temperature
CHRG Pin Weak Pull-Down
Current vs Temperature
CHRG Pin Output Low Voltage
vs Temperature
TEMPERATURE (
C)
50
25
7
I
BAT
(% OF PROGRAMMED CURRENT)
9
12
0
50
75
4053 G13
8
11
10
25
100
125
V
BAT
= 2V
T
A
= 25
C
R
PROG
= 3k
TEMPERATURE (
C)
50
25
I
CHRG
(
A)
26
28
29
30
35
32
0
50
75
LTC1323 TPC05
27
33
34
31
25
25
100
125
V
CC
= 5V
I
BAT
< C/10
TEMPERATURE (
C)
50
V
CHRG
(V)
0.4
0.5
0.6
25
75
4053 G15
0.3
0.2
25
0
50
100
125
0.1
0
V
CC
= 5V
I
CHRG
= 5mA
Timer Error vs Temperature
TEMPERATURE (
C)
50
5
t
TIMER
(%)
4
2
1
0
5
2
0
50
75
LTC1323 TPC05
3
3
4
1
25
25
100
125
V
CC
= 5V
C
TIMER
= 0.1
F
Timer Error vs V
CC
V
CC
(V)
4
5
t
TIMER
(%)
3
1
1
4.5
5
5.5
6
4056 G17
6.5
3
5
4
2
0
2
4
7
T
A
= 25
C
C
TIMER
= 0.1
F
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