FeaTures
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LTC4054L-4.2
150mA Standalone Linear
Li-Ion Battery Charger in ThinSOT
DescripTion
The LTC
®
4054L is a complete, constant-current/constant-
voltage linear charger for single cell lithium-ion batteries.
Its small size and ability to regulate low charge currents
make the LTC4054L especially well-suited for portable ap-
plications using low capacity rechargeable lithium-ion coin
cells. Furthermore, the LTC4054L 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 eliminate
thermal overdesign. The charge voltage is fixed at 4.2V, and
the charge current can be programmed externally with a
single resistor. The LTC4054L automatically terminates a
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 LTC4054L automatically enters a low current
state, dropping the battery drain current to less than 2µA.
The LTC4054L 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.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. *Protected by U.S. Patents including 6,522,118.
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Programmable Charge Current Range:
10mA to 150mA
No External MOSFET, Sense Resistor or Blocking
Diode Required
Complete Linear Charger in ThinSOT™ Package for
Single Cell/Coin 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 Max Supply Current in Shutdown Mode
2.9V Trickle Charge Threshold
Soft-Start Limits Inrush Current
Available in a 5-Lead Low Profile (1mm)
SOT-23 Package
applicaTions
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Charger for Li-Ion Coin Cell Batteries
Portable MP3 Players, Wireless Headsets
Bluetooth Applications
Multifunction Wristwatches
Typical applicaTion
90mA Li-Ion Single Coin Cell Charger
V
IN
4.5V TO 6.5V
1µF
Complete Charge Cycle (130mAh Battery)
100
90
80
CHARGE CURRENT (mA)
70
60
50
40
30
20
10
0
V
CC
= 5V
θ
JA
= 130°C/W
R
PROG
= 1.69k
T
A
= 25°C
CONSTANT
CURRENT
4.4
4.3
CONSTANT
VOLTAGE
4.2
BATTERY VOLTAGE (V)
4.1
4.0
3.9
3.8
3.7
3.6
3.5
4
BAT
LTC4054L-4.2
PROG
GND
2
V
CC
3
5
1.69k
90mA
4.2V
COIN CELL
Li-Ion
BATTERY
4054l42 TA01
3.4
0 0.25 0.5 0.75 1.0 1.25 1.5 1.75 2.0 2.25
TIME (HOURS)
4054l42 TA01b
4054l42fa
1
LTC4054L-4.2
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
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
CHRG
......................................................... –0.3V to 10V
BAT .............................................................. –0.3V to 7V
BAT Short-Circuit Duration ........................... Continuous
BAT Pin Current .................................................. 200mA
PROG Pin Current .................................................1.5mA
Maximum Junction Temperature .......................... 125°C
Operating Temperature Range (Note 2)....–40°C to 85°C
Storage Temperature Range .................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec)................... 300°C
S5 PACKAGE
5-LEAD PLASTIC TSOT-23
T
JMAX
= 125°C,
θ
JA
= 80°C/W TO 150°C/W
DEPENDING ON PCB BOARD LAYOUT (NOTE 3)
orDer inForMaTion
LEAD FREE FINISH
LTC4054LES5-4.2#PBF
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
5-Lead Plastic TSOT-23
TEMPERATURE RANGE
–40°C to 85°C
LTC4054LES5-4.2#TRPBF LTAFA
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
elecTrical characTerisTics
SYMBOL
V
CC
I
CC
PARAMETER
Supply Voltage
Supply Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 5V, unless otherwise noted.
CONDITIONS
l
MIN
4.25
l
l
l
TYP
1200
200
25
MAX
6.5
2000
500
50
4.242
10.7
157.5
–6
±2
±2
25
3
110
3.92
300
1.30
1.1
140
50
UNITS
V
µA
µA
µA
V
mA
mA
µA
µA
µA
mA
V
mV
V
mV
V
V
mV
mV
4054l42fa
Charge Mode (Note 4), R
PROG
= 1k
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
= 15k, Current Mode
R
PROG
= 1k, 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
= 1k (I
BAT
= 150mA)
R
PROG
= 15k, V
BAT
Rising
R
PROG
= 15k
From V
CC
Low to High
PROG Pin Rising
PROG Pin Falling
V
CC
from Low to High
V
CC
from High to Low
V
FLOAT
I
BAT
Regulated Output (Float) Voltage
BAT Pin Current
4.158
l
l
l
4.2
10
150
–2.5
±1
±1
15
2.9
80
3.8
200
1.21
1.0
100
30
9.3
142.5
0
I
TRIKL
V
TRIKL
V
TRHYS
V
UV
V
UVHYS
V
MSD
V
ASD
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
V
CC
Undervoltage Lockout Threshold Voltage
V
CC
Undervoltage Lockout Hysteresis Voltage
Manual Shutdown Threshold Voltage
V
CC
– V
BAT
Lockout Threshold Voltage
l
5
2.8
60
l
l
l
l
3.7
150
1.15
0.9
70
5
2
LTC4054L-4.2
elecTrical characTerisTics
SYMBOL
I
TERM
V
PROG
I
CHRG
V
CHRG
∆V
RECHRG
T
LIM
R
ON
t
SS
t
RECHARGE
t
TERM
I
PROG
PARAMETER
C/10 Termination Current Threshold
PROG Pin Voltage
CHRG
Pin Weak Pull-Down Current
CHRG
Pin Output Low Voltage
Recharge Battery Hysteresis Voltage
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
=150V/R
PROG
V
BAT
High to Low
I
BAT
Drops Below I
CHG
/10
0.75
400
1.5
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
V
CC
= 5V, unless otherwise noted.
CONDITIONS
R
PROG
= 15k (I
BAT
= 10mA) (Note 5)
R
PROG
= 1k (I
BAT
= 150mA) (Note 5)
R
PROG
= 1k, Current Mode
V
CHRG
= 5V
I
CHRG
= 5mA
V
FLOAT
– V
RECHRG
100
l
l
l
MIN
0.085
0.088
0.93
8
TYP
0.10
0.10
1
20
0.35
150
120
1.5
100
2
1000
3
MAX
0.115
0.112
1.07
35
0.6
200
UNITS
mA/mA
mA/mA
V
µA
V
mV
°C
Ω
µs
4.5
2500
5
ms
µs
µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LTC4054LE-4.2 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 3:
See Thermal Considerations.
Note 4:
Supply current includes PROG pin current (≈1mA) but does not
include any current delivered to the battery through the BAT pin.
Note 5:
I
TERM
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Typical perForMance characTerisTics
PROG Pin Voltage vs Supply
Voltage (Constant Current Mode)
1.0100
1.0075
1.0050
V
PROG
(V)
1.0025
R
PROG
= 1k
R
PROG
= 15k
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
1.0100
1.0075
1.0050
V
PROG
(V)
I
BAT
(mA)
1.0025
120
90
60
30
0
PROG Pin Voltage vs Temperature
(Constant Current Mode)
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 1k
180
150
Charge Current
vs PROG Pin Voltage
V
CC
= 5V
R
PROG
= 1k
T
A
= 25°C
1.0000
0.9975
1.0000
0.9975
0.9950
0.9925
0.9900
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
0.9950
0.9925
0.9900
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
4054L G02
0
0.25
0.5
0.75
V
PROG
(V)
1
1.25
4054L G03
4054L G01
4054l42fa
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LTC4054L-4.2
Typical perForMance characTerisTics
PROG Pin Pull-Up Current vs
Temperature and Supply Voltage
3.7
3.5
3.3
I
PROG
(µA)
I
PROG
(µA)
3.1
2.9
2.7
2.5
–50 –25
V
BAT
= 4.3V
V
PROG
= 0V
3.5
3.0
2.5
2.0
1.5
1.0
0.5
50
25
75
0
TEMPERATURE (°C)
100
125
0
2.0
2.1
2.2
2.3
V
PROG
(V)
2.4
2.5
2.6
I
PROG
(µA)
PROG Pin Current vs PROG Pin
Voltage (Pull-Up Current)
V
CC
= 5V
V
BAT
= 4.3V
T
A
= 25°C
0
–50
–100
–150
–200
–250
–300
–350
–400
PROG Pin Current vs PROG Pin
Voltage (Clamp Current)
V
CC
= 5V
V
BAT
= 4.3V
T
A
= 25°C
V
CC
= 6.5V
V
CC
= 4.2V
2
2.5
3
4054L G04
4054L G05
4
3.5
V
PROG
(V)
4.5
5
5.5
4054L G06
Regulated Output (Float) Voltage
vs Charge Current
4.26
V
CC
= 5V
R
PROG
= 600
4.24 T
A
= 25°C
4.22
V
FLOAT
(V)
V
FLOAT
(V)
4.20
4.18
4.16
4.14
4.215
4.210
4.205
4.200
4.195
4.190
Regulated Output (Float) Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 1k
4.215
4.210
4.205
V
FLOAT
(V)
4.200
4.195
4.190
4.185
Regulated Output (Float) Voltage
vs Supply Voltage
R
PROG
= 1k
T
A
= 25°C
0
30
60
90
120
I
BAT
(mA)
150
180
4.185
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4
4.5
5
4054L G07
4054L G08
5.5
V
CC
(V)
6
6.5
7
4054L G09
CHRG
Pin I-V Curve
(Strong Pull-Down State)
25
V
CC
= 5V
V
BAT
= 4V
T
A
= 25°C
20
CHRG
Pin Current vs Temperature
(Strong Pull-Down State)
V
CC
= 5V
18 V
BAT
= 4V
V
CHRG
= 1V
16
I
CHRG
(mA)
I
CHRG
(µA)
14
12
10
8
6
22
20
18
16
14
12
10
8
CHRG
Pin I-V Curve
(Weak Pull-Down State)
20
I
CHRG
(mA)
15
10
5
0
0
1
2
4
3
V
CHRG
(V)
5
6
7
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
0
75
50
25
TEMPERATURE (°C)
100
125
4054L G10
4054L G11
4054L G12
4054l42fa
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LTC4054L-4.2
Typical perForMance characTerisTics
CHRG
Pin Current vs Temperature
(Weak Pull-Down State)
28
V
CC
= 5V
V
BAT
= 4.3V
25 V
CHRG
= 5V
22
I
TRKL
(mA)
19
16
13
10
–50
V
CC
= 5V
V
BAT
= 2.5V
I
TRKL
(mA)
I
CHRG
(µA)
9
9
V
BAT
= 2.5V
T
A
= 25°C
15
R
PROG
= 1k
Trickle Charge Current
vs Temperature
15
Trickle Charge Current
vs Supply Voltage
R
PROG
= 1k
12
12
6
6
3
R
PROG
= 15k
–25
0
25
50
TEMPERATURE (°C)
75
100
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
3
R
PROG
= 15k
0
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
4054L G13
4054L G14
4054L G15
Trickle Charge Threshold
vs Temperature
V
CC
= 5V
2.975 R
PROG
= 1k
2.950
V
TRKL
(V)
I
BAT
(mA)
2.925
2.900
2.875
2.850
2.825
2.800
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
4054L G16
Charge Current vs Battery Voltage
160
200
Charge Current vs Supply Voltage
V
BAT
= 4V
T
A
= 25°C
θ
JA
= 125°C/W
R
PROG
= 1k
3.000
120
V
CC
= 5V
R
PROG
= 1k
T
A
= 25°C
θ
JA
= 125°C/W
I
BAT
(mA)
160
120
80
80
40
40
R
PROG
= 15k
0
2.7
3.0
3.3
3.6
3.9
V
BAT
(V)
4.2
4.5
0
4
4.5
5
5.5
V
CC
(V)
6
6.5
7
4054L G17
4054L G18
Charge Current
vs Ambient Temperature
180
150
120
I
BAT
(mA)
V
BAT
= 4V
90 V
CC
= 5V
θ
JA
= 125°C/W
60
30
R
PROG
= 15k
0
–50 –25
50
25
75
0
TEMPERATURE (°C)
100
125
R
PROG
= 1k
ONSET OF
THERMAL
REGULATION
4.11
4.09
4.07
4.05
4.03
4.01
Recharge Voltage Threshold
vs Temperature
V
CC
= 5V
R
PROG
= 1k
1.8
Power FET “ON” Resistance
vs Temperature
V
CC
= 4.1V
V
BAT
= 4V
R
PROG
= 1k
1.6
R
DS(ON)
(m )
–25
0
25
50
TEMPERATURE (°C)
75
100
V
RECHRG
(V)
1.4
1.2
1.0
3.99
–50
0.8
–50
–25
50
0
75
25
TEMPERATURE (°C)
100
125
4054L G19
4054L G20
4054L G21
4054l42fa
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