LTC4053-4.2
USB Compatible
Lithium-Ion Battery Charger
with Thermal Regulation
FEATURES
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DESCRIPTIO
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
25µA 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
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 5µA.
The LTC4053 also includes NTC temperature sensing,
C/10 detection circuitry, AC present logic, low battery
charge conditioning (trickle charging) and shutdown (25µA
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.
Protected by U.S. Patents including 6522118, 6700364.
APPLICATIO S
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Cellular Telephones
Handheld Computers
Charging Docks and Cradles
MP3 Players
Digital Cameras
TYPICAL APPLICATIO
USB PORT
4.35V TO 5.5V
2
V
CC
BAT
Charge Current vs Input Voltage
600
500
400
I
BAT
(mA)
USB Powered Standalone Li-Ion Charger
9
SYSTEM
LOAD
Li-Ion
BATTERY
V
BAT
= 3.95V
+
LTC4053-4.2
4
4.7µF
8
300
200
TIMER
SHDN
SUSPEND
3.74k
USB CONTROL
µC
100mA/
500mA
GND NTC PROG
5
6
7
15k
V
BAT
= 4.15V
100
0
0.1µF
4.0
4053TA01
U
T
A
= 25°C
R
PROG
= 3k
V
BAT
= 4.05V
4.5
V
CC
(V)
4053 G04
U
U
5.0
5.5
4053fa
1
LTC4053-4.2
ABSOLUTE
AXI U RATI GS
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
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CHRG
V
CC
FAULT
TIMER
GND
1
2
3
4
5
11
10 ACPR
9 BAT
8 SHDN
7 PROG
6 NTC
ORDER PART
NUMBER
LTC4053EDD-4.2
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 4)
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
DD PART MARKING
LBQC
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.
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V
SYMBOL
V
CC
I
CC
PARAMETER
V
CC
Supply Voltage
V
CC
Supply Current
Charger On; Current Mode; R
PROG
= 30k (Note 5)
Shutdown Mode; V
SHDN
= 0V
Sleep Mode V
CC
< V
BAT
or V
CC
≤
4V
R
PROG
= 3k; Current Mode
R
PROG
= 15k; Current Mode
Shutdown Mode; V
SHDN
= 0V
Sleep Mode V
CC
< V
BAT
or V
CC
< (V
UV
–
∆V
UV
)
V
BAT
< 2V; R
PROG
= 3k
V
BAT
Rising
V
CC
Rising
SHDN Pin Voltage
●
ELECTRICAL CHARACTERISTICS
CONDITIONS
●
●
●
●
●
●
●
V
BAT
I
BAT
V
BAT
Regulated Float Voltage
Battery Pin Current
I
TRIKL
V
TRIKL
∆V
TRIKL
V
UV
∆V
UV
V
MSD
V
ASD
Trickle Charge Current
Trickle Charge Trip Threshold
Trickle Charge Trip Hysteresis
V
CC
Undervoltage Lockout Voltage
V
CC
Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
Automatic Shutdown Threshold Voltage (V
CC
- V
BAT
) High to Low
(V
CC
- V
BAT
) Low to High
2
U
U
W
W W
U
W
(Note 1)
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
TOP VIEW
CHRG
V
CC
FAULT
TIMER
GND
1
2
3
4
5
10
9
8
7
6
ACPR
BAT
SHDN
PROG
NTC
ORDER PART
NUMBER
LTC4053EMSE-4.2
11
MSE EXPOSED PAD PACKAGE
10-LEAD PLASTIC MSOP
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 4)
EXPOSED PAD (PIN 11) IS GND
(MUST BE SOLDERED TO PCB)
MSE PART MARKING
LTZT
MIN
4.25
TYP
1
25
25
MAX
6.5
2
50
50
4.242
535
107
±3
±3
65
UNITS
V
mA
µA
µA
V
mA
mA
µA
µA
mA
V
mV
4.158
465
93
4.2
500
100
±1
±1
50
2.48
100
4
200
●
35
4.25
1.3
V
mV
V
mV
mV
4053fa
0.6
35
70
LTC4053-4.2
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V
SYMBOL
V
PROG
I
CHRG
V
CHRG
V
ACPR
V
FAULT
I
C/10
t
TIMER
V
RECHRG
V
NTC-HOT
V
HOT-HYS
V
NTC-COLD
V
COLD-HYS
V
NTC-DIS
V
DIS-HYS
T
LIM
R
ON
PARAMETER
PROG Pin Voltage
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
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
Junction Temperature in
Constant-Temperature Mode
Power MOSFET “ON” Resistance
V
NTC
Rising
V
NTC
Rising
CONDITIONS
R
PROG
= 3k, I
PROG
= 500µA
V
CHRG
= 1V
I
CHRG
= 5mA
I
ACPR
= 5mA
I
FAULT
= 5mA
R
PROG
= 3k
C
TIMER
= 0.1µF
Battery Voltage Falling
V
NTC
Falling
44
15
MIN
TYP
1.5
30
0.35
0.35
0.35
50
10
4.035
2.5
80
4.375
80
100
10
105
375
50
0.6
0.6
0.6
56
MAX
UNITS
V
µA
V
V
V
mA
%
V
V
mV
V
mV
mV
mV
°C
mΩ
ELECTRICAL CHARACTERISTICS
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 70°C. Specifications over the –40°C to 85°C operating
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 50µA)
but does not include any current delivered to the battery through the BAT
pin (approximately 50mA).
4053fa
3
LTC4053-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulation Voltage
vs Battery Charge Current
4.22
4.21
4.20
V
CC
= 5V
T
A
= 25°C
R
PROG
= 3k
V
BAT
(V)
V
BAT
(V)
4.19
4.18
4.17
V
BAT
(V)
4.16
0
50 100 150 200 250 300 350 400 450 500
I
BAT
(mA)
4053 G01
Charge Current vs Input Voltage
600
500
400
V
BAT
= 3.95V
T
A
= 25°C
R
PROG
= 3k
I
BAT
(mA)
I
BAT
(mA)
I
BAT
(mA)
V
BAT
= 4.05V
300
200
V
BAT
= 4.15V
100
0
4.0
4.5
V
CC
(V)
5.0
Undervoltage Lockout Voltage
vs Temperature
4.05
4.04
4.03
4.02
I
CC
(µA)
V
UV
(V)
4.00
3.99
3.98
3.97
3.96
3.95
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
15
10
5
0
–50 –25
V
CC
= 4.5V
V
MSD
(V)
4.01
4
U W
4053 G04
Battery Regulation Voltage
vs Temperature
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
4.08
V
CC
= 5V
R
PROG
= 3k
I
BAT
= 10mA
–25
0
25
50
75
TEMPERATURE (°C)
100
125
4.210
4.208
4.206
4.204
4.202
4.200
4.198
4.196
4.194
4.192
4.190
Battery Regulation Voltage
vs V
CC
V
CC
= 5V
R
PROG
= 3k
I
BAT
= 10mA
4.06
–50
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
4053 G03
4053 G02
Charge Current vs Battery Voltage
550
500
450
400
350
300
250
200
150
100
50
0
5.5
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
900
800
700
600
500
400
300
200
100
V
CC
= 5V
V
BAT
= 3.5V
R
PROG
= 1.5k
–25
25
50
0
TEMPERATURE (°C)
75
100
4053 G06
V
CC
= 5V
T
A
= 25°C
R
PROG
= 3k
THERMAL CONTROL
LOOP IN OPERATION
0
0.5
1
1.5
2 2.5
V
BAT
(V)
3
3.5
4
4.5
0
–50
4053 G05
Shutdown Supply Current
vs Temperature
30
25
20
1.30
Manual Shutdown Threshold
Voltage vs Temperature
1.25
1.20
V
SHDN
= 0V
V
CC
= 6.5V
V
CC
= 5.5V
1.15
1.10
1.05
1.00
0.95
0.90
0.85
V
CC
= 5V
V
CC
= 6V
V
CC
= 5.5V
V
CC
= 4.5V
50
25
75
0
TEMPERATURE (°C)
100
125
0.80
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
4053 G07
4053 G08
4053 G09
4053fa
LTC4053-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
PROG Pin Voltage
vs Charge Current
1.6
1.4
1.2
V
CC
= 5V
T
A
= 25°C
R
PROG
= 3k
V
PROG
(V)
V
PROG
(V)
V
PROG
(V)
1.0
0.8
0.6
0.4
0.2
0
0
50 100 150 200 250 300 350 400 450 500
CHARGE CURRENT (mA)
4052 G10
Trickle Charge Current
vs Temperature
12
I
BAT
(% OF PROGRAMMED CURRENT)
11
V
BAT
= 2V
T
A
= 25°C
R
PROG
= 3k
I
CHRG
(µA)
30
29
28
V
CHRG
(V)
10
9
8
7
–50 –25
50
25
0
75
TEMPERATURE (°C)
Timer Error vs Temperature
5
4
3
2
V
CC
= 5V
C
TIMER
= 0.1µF
t
TIMER
(%)
0
–1
–2
–3
–4
–5
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
t
TIMER
(%)
1
U W
100
4053 G13
PROG Pin Voltage vs V
CC
Constant Current Mode
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.515
V
BAT
= 3.5V
T
A
= 25°C
R
PROG
= 3k
1.510
1.505
1.500
1.495
1.490
PROG Pin Voltage vs Temperature
Constant Current Mode
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 3k
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
4053 G11
1.485
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4053 G12
CHRG Pin Weak Pull-Down
Current vs Temperature
35
V
CC
= 5V
34 I
BAT
< C/10
33
32
31
CHRG Pin Output Low Voltage
vs Temperature
0.6
0.5
0.4
0.3
0.2
0.1
0
–50 –25
V
CC
= 5V
I
CHRG
= 5mA
27
26
125
25
–50 –25
50
25
0
75
TEMPERATURE (°C)
100
125
50
25
75
0
TEMPERATURE (°C)
100
125
LTC1323 • TPC05
4053 G15
Timer Error vs V
CC
5
4
3
2
1
0
–1
–2
–3
–4
–5
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
4056 G17
T
A
= 25°C
C
TIMER
= 0.1µF
LTC1323 • TPC05
4053fa
5
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