LTC4054-4.2/LTC4054X-4.2
Standalone Linear
Li-Ion Battery Charger with
Thermal Regulation in ThinSOT
FEATURES
s
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DESCRIPTIO
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Programmable Charge Current Up to 800mA
No MOSFET, Sense Resistor or Blocking
Diode Required
Complete Linear Charger in ThinSOT
TM
Package for
Single Cell Lithium-Ion Batteries
Constant-Current/Constant-Voltage Operation with
Thermal Regulation* to Maximize Charge Rate
Without Risk of Overheating
Charges Single Cell Li-Ion Batteries Directly
from USB Port
Preset 4.2V Charge Voltage with
±1%
Accuracy
Charge Current Monitor Output for Gas
Gauging*
Automatic Recharge
Charge Status Output Pin
C/10 Charge Termination
25µA Supply Current in Shutdown
2.9V Trickle Charge Threshold (LTC4054)
Available Without Trickle Charge (LTC4054X)
Soft-Start Limits Inrush Current
Available in 5-Lead SOT-23 Package
The LTC
®
4054 is a complete constant-current/constant-
voltage linear charger for single cell lithium-ion batteries.
Its ThinSOT package and low external component count
make the LTC4054 ideally suited for portable applications.
Furthermore, the LTC4054 is specifically designed to work
within USB power specifications.
No external sense resistor is needed, and no blocking
diode is required due to the internal MOSFET architecture.
Thermal feedback regulates the charge current to limit the
die temperature during high power operation or high
ambient temperature. The charge voltage is fixed at 4.2V,
and the charge current can be programmed externally with
a single resistor. The LTC4054 automatically terminates
the charge cycle when the charge current drops to 1/10th
the programmed value after the final float voltage is
reached.
When the input supply (wall adapter or USB supply) is
removed, the LTC4054 automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The LTC4054 can be put into shutdown mode, reducing
the supply current to 25µA.
Other features include charge current monitor, undervoltage
lockout, automatic recharge and a status pin to indicate
charge termination and the presence of an input voltage.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
*U.S.Patent No. 6,522,118
APPLICATIO S
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Cellular Telephones, PDAs, MP3 Players
Charging Docks and Cradles
Bluetooth Applications
TYPICAL APPLICATIO
V
IN
4.5V TO 6.5V
Complete Charge Cycle (750mAh Battery)
700
600
CONSTANT
CURRENT
CONSTANT
POWER
CONSTANT
VOLTAGE
4.75
4.50
600mA Single Cell Li-Ion Charger
CHARGE CURRENT (mA)
500
400
300
200
100
0
1µF
BAT
LTC4054-4.2
PROG
GND
2
4
V
CC
3
600mA
5
1.65k
4.2V
Li-Ion
BATTERY
405442 TA01a
V
CC
= 5V
θ
JA
= 130°C/W
R
PROG
= 1.65k
T
A
= 25°C
0
3.00
0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0
TIME (HOURS)
405442 TAO1b
405442xf
U
BATTERY VOLTAGE (V)
4.25
4.00
3.75
3.50
CHARGE
TERMINATED
3.25
U
U
1
LTC4054-4.2/LTC4054X-4.2
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
CHRG 1
GND 2
BAT 3
4 V
CC
5 PROG
Input Supply Voltage (V
CC
) ....................... –0.3V to 10V
PROG ............................................. – 0.3V to V
CC
+ 0.3V
BAT .............................................................. –0.3V to 7V
CHRG ........................................................ –0.3V to 10V
BAT Short-Circuit Duration .......................... Continuous
BAT Pin Current ................................................. 800mA
PROG Pin Current ................................................ 800µA
Maximum Junction Temperature .......................... 125°C
Operating Ambient Temperature Range
(Note 2) .............................................. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
ORDER PART
NUMBER
LTC4054ES5-4.2
LTC4054XES5-4.2
S5 PART MARKING
LTH7
LTADY
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
(θ
JA
= 80°C/ W TO
150°C/W DEPENDING ON PC BOARD LAYOUT)
(N0TE 3)
Consult LTC Marketing for parts specified with wider operating temperature ranges.
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted.
SYMBOL
V
CC
I
CC
PARAMETER
Input Supply Voltage
Input Supply Current
Charge Mode (Note 4), R
PROG
= 10k
Standby Mode (Charge Terminated)
Shutdown Mode (R
PROG
Not Connected,
V
CC
< V
BAT
, or V
CC
< V
UV
)
0°C
≤
T
A
≤
85°C, I
BAT
= 40mA
R
PROG
= 10k, Current Mode
R
PROG
= 2k, Current Mode
Standby Mode, V
BAT
= 4.2V
Shutdown Mode (R
PROG
Not Connected)
Sleep Mode, V
CC
= 0V
V
BAT
< V
TRIKL
, R
PROG
= 2k (Note 5)
R
PROG
= 10k, V
BAT
Rising (Note 5)
R
PROG
= 10k (Note 5)
From V
CC
Low to High
PROG Pin Rising
PROG Pin Falling
V
CC
from Low to High
V
CC
from High to Low
R
PROG
= 10k (Note 6)
R
PROG
= 2k
R
PROG
= 10k, Current Mode
V
CHRG
= 5V
I
CHRG
= 5mA
V
FLOAT
- V
RECHRG
100
q
q
q
q
q
q
q
q
q
q
ELECTRICAL CHARACTERISTICS
CONDITIONS
q
q
q
q
MIN
4.25
TYP
300
200
25
MAX
6.5
2000
500
50
4.242
107
535
–6
±2
±2
70
3.0
110
3.92
300
1.30
1.1
140
50
0.115
0.115
1.07
35
0.6
200
UNITS
V
µA
µA
µA
V
mA
mA
µA
µA
µA
mA
V
mV
V
mV
V
V
mV
mV
mA/mA
mA/mA
V
µA
V
mV
V
FLOAT
I
BAT
Regulated Output (Float) Voltage
BAT Pin Current
4.158
93
465
0
4.2
100
500
–2.5
±1
±1
45
2.9
80
3.8
200
1.21
1.0
100
30
0.10
0.10
1.0
20
0.35
150
I
TRIKL
V
TRIKL
V
TRHYS
V
UV
V
UVHYS
V
MSD
V
ASD
I
TERM
V
PROG
I
CHRG
V
CHRG
∆V
RECHRG
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
V
CC
Undervoltage Lockout Threshold
V
CC
Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
V
CC
– V
BAT
Lockout Threshold Voltage
C/10 Termination Current Threshold
PROG Pin Voltage
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
Recharge Battery Threshold Voltage
q
20
2.8
60
3.7
150
1.15
0.9
70
5
0.085
0.085
0.93
8
405442xf
2
U
W
U
U
W W
W
LTC4054-4.2/LTC4054X-4.2
The
q
denotes specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 5V, unless otherwise noted.
SYMBOL
T
LIM
R
ON
t
SS
t
RECHARGE
t
TERM
I
PROG
PARAMETER
Junction Temperature in Constant
Temperature Mode
Power FET “ON” Resistance
(Between V
CC
and BAT)
Soft-Start Time
Recharge Comparator Filter Time
Termination Comparator Filter Time
PROG Pin Pull-Up Current
I
BAT
= 0 to I
BAT
=1000V/R
PROG
V
BAT
High to Low
I
BAT
Falling Below I
CHG
/10
0.75
400
CONDITIONS
MIN
TYP
120
600
100
2
1000
3
4.5
2500
MAX
UNITS
°C
mΩ
µs
ms
µs
µA
ELECTRICAL CHARACTERISTICS
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
The LTC4054E-4.2 and the LTC4054XE-4.2 are 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 3:
See Thermal Considerations.
Note 4:
Supply current includes PROG pin current (approximately 100µA)
but does not include any current delivered to the battery through the BAT
pin (approximately 100mA).
Note 5:
This parameter is not applicable to the LTC4054X.
Note 6:
I
TERM
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
TYPICAL PERFOR A CE CHARACTERISTICS
PROG Pin Voltage vs Supply
Voltage(Constant Current Mode)
1.015
1.010
1.005
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
R
PROG
= 10k
1.0100
1.0075
1.0050
V
PROG
(V)
V
PROG
(V)
1.000
0.995
0.990
0.985
I
BAT
(mA)
–25
0
25
50
TEMPERATURE (°C)
75
100
4054 G02
4.0
4.5
5.0
5.5
V
CC
(V)
6.0
U W
6.5
4054 G01
PROG Pin Voltage vs
Temperature
600
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
Charge Current vs
PROG Pin Voltage
V
CC
= 5V
T
A
= 25°C
500 R
PROG
= 2k
400
300
200
100
0
1.0025
1.0000
0.9975
0.9950
0.9925
7.0
0.9900
–50
0
0.25
0.50
0.75
V
PROG
(V)
1.00
1.25
4054 G03
405442xf
3
LTC4054-4.2/LTC4054X-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
PROG Pin Pull-Up Current vs
Temperature and Supply Voltage
3.7
3.5
V
CC
= 4.2V
3.3
I
PROG
(µA)
I
PROG
(µA)
V
BAT
= 4.3V
V
PROG
= 0V
2.0
1.5
1.0
0.5
V
CC
= 5V
V
BAT
= 4.3V
T
A
= 25°C
2.1
2.2
2.3
V
PROG
(V)
2.4
2.5
2.6
I
PROG
(µA)
3.1
V
CC
= 6.5V
2.9
2.7
2.5
–50 –25
50
25
75
0
TEMPERATURE (°C)
Regulated Output (Float) Voltage
vs Charge Current
4.26
4.24
4.22
V
FLOAT
(V)
V
CC
= 5V
T
A
= 25°C
R
PROG
= 1.25k
V
FLOAT
(V)
4.18
4.16
4.14
4.12
4.10
0
100
200
300 400
I
BAT
(mA)
500
600
700
V
FLOAT
(V)
4.20
CHRG Pin I-V Curve
(Strong Pull-Down State)
25
20
18
20
16
I
CHRG
(mA)
I
CHRG
(µA)
15
I
CHRG
(mA)
10
5
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
0
1
2
4
3
V
CHRG
(V)
5
6
7
0
4
U W
100
4054 G04
4054 G07
4054 G10
PROG Pin Current vs PROG Pin
Voltage (Pull-Up Current)
3.5
3.0
2.5
0
–50
–100
–150
–200
–250
–300
–350
PROG Pin Current vs PROG Pin
Voltage (Clamp Current)
125
0
2.0
–400
2.0
V
CC
= 5V
V
BAT
= 4.3V
T
A
= 25°C
2.5
3.0
3.5
4.0
4.5
5.0
5.5
V
PROG
(V)
4054 G05
4054 G06
Regulated Output (Float) Voltage
vs Temperature
4.215
4.210
4.205
4.200
4.195
4.190
4.185
–50
V
CC
= 5V
R
PROG
= 10k
4.215
4.210
4.205
4.200
4.195
4.190
4.185
Regulated Output (Float) Voltage
vs Supply Voltage
T
A
= 25°C
R
PROG
= 10k
–25
0
25
50
75
100
4054 G08
4.0
4.5
5.0
TEMPERATURE (°C)
5.5
V
CC
(V)
6.0
6.5
7.0
4054 G09
CHRG Pin Current vs Temperature
(Strong Pull-Down State)
22
V
CC
= 5V
V
BAT
= 4V
V
CHRG
= 1V
20
18
16
14
12
10
8
0
25
50
75
100
125
CHRG Pin I-V Curve
(Weak Pull-Down State)
14
12
10
8
6
4
–50 –25
V
CC
= 5V
V
BAT
= 4.3V
T
A
= 25°C
0
1
2
4
3
V
CHRG
(V)
5
6
7
TEMPERATURE (°C)
4054 G11
4054 G12
405442xf
LTC4054-4.2/LTC4054X-4.2
TYPICAL PERFOR A CE CHARACTERISTICS
CHRG Pin Current vs Temperature
(Weak Pull-Down State)
28
25
23
I
TRIKL
(mA)
I
CHRG
(µA)
30
V
CC
= 5V
V
BAT
= 2.5V
20
I
TRIKL
(mA)
30
V
BAT
= 2.5V
T
A
= 25°C
19
16
13
10
–50
10
R
PROG
= 10k
10
R
PROG
= 10k
V
CC
= 5V
V
BAT
= 4.3V
V
CHRG
= 5V
50
R
PROG
= 2k
40
40
–25
0
25
50
TEMPERATURE (°C)
Trickle Charge Threshold vs
Temperature
3.000
2.975
2.950
V
TRIKL
(V)
I
BAT
(mA)
V
CC
= 5V
R
PROG
= 10k
600
I
BAT
(mA)
2.925
2.900
2.875
2.850
2.825
2.800
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4054 G16
Charge Current vs Ambient
Temperature
600
R
PROG
= 2k
500
400
I
BAT
(mA)
300
200
R
PROG
= 10k
100
0
–50 –25
V
CC
= 5V
V
BAT
= 4V
θ
JA
= 80°C/W
ONSET OF
THERMAL
REGULATION
4.11
4.09
4.07
V
RECHRG
(V)
4.05
4.03
4.01
R
DS(ON)
(mΩ)
50
25
75
0
TEMPERATURE (°C)
U W
75
4054 G13
Trickle Charge Current
vs Temperature
50
Trickle Charge Current vs
Supply Voltage
R
PROG
= 2k
20
100
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4054 G14
0
4.0
4.5
5.0
5.5
V
CC
(V)
6.0
6.5
7.0
4054 G15
Charge Current vs Battery Voltage
600
T
A
= 0°C
500
400
300
200
100
0
2.7
V
CC
= 5V
θ
JA
= 125°C/W
R
PROG
= 2k
3.0
3.3
3.6
3.9
V
BAT
(V)
4.2
4.5
4054 G17
Charge Current vs Supply Voltage
R
PROG
= 2k
500
T
A
= 40°C
T
A
= 25°C
400
300
200
100
0
R
PROG
= 10k
V
BAT
= 4V
T
A
= 25°C
θ
JA
= 80°C/W
ONSET OF
THERMAL
REGULATION
4.0
4.5
5.0
5.5
V
CC
(V)
6.0
6.5
7.0
4054 G18
Recharge Voltage Threshold
vs Temperature
700
V
CC
= 5V
R
PROG
= 10k
650
600
550
500
450
400
Power FET “ON” Resistance
vs Temperature
V
CC
= 4.2V
I
BAT
= 100mA
R
PROG
= 2k
100
125
3.99
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4054 G20
350
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
4054 G19
4054 G21
405442xf
5
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