LTC4065L/LTC4065LX
Standalone 250mA Li-Ion
Battery Charger in 2
×
2 DFN
FEATURES
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DESCRIPTIO
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Charge Current Programmable up to 250mA with
5% Accuracy
Complete Linear Charger in 2mm
×
2mm DFN
Package
C/10 Charge Current Detection Output
Timer Termination
No External MOSFET, Sense Resistor or Blocking
Diode Required
Preset 4.2V Float Voltage with 0.6% Accuracy
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
Charge Current Monitor Output for Gas Gauging
Automatic Recharge
Charges Single Cell Li-Ion Batteries Directly from
USB Port
20µA Supply Current in Shutdown Mode
Soft-Start Limits Inrush Current
Available Without Trickle Charge (LTC4065LX)
Tiny 6-Lead (2mm
×
2mm) DFN Package
The LTC
®
4065L is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion batteries.
Its small size and ability to accurately regulate low charge
currents make the LTC4065L especially well-suited for
portable applications using low capacity rechargeable
lithium-ion cells. Furthermore, LTC4065L is specifically
designed to work within USB power specifications.
The CHRG pin indicates when charge current has dropped
to ten percent of its programmed value (C/10). An internal
timer terminates charging according to battery manufac-
turer specifications.
No external sense resistor or blocking diode is required
due to the internal MOSFET architecture. Thermal feed-
back regulates charge current to limit the die temperature
during high power operation or high ambient temperature
conditions.
When the input supply (wall adapter or USB supply) is
removed, the LTC4065L automatically enters a low cur-
rent state, dropping battery drain current to less than 1µA.
With power applied, LTC4065L can be put into shutdown
mode, reducing the supply current to less than 20µA.
The full-featured LTC4065L also includes automatic re-
charge, low-battery charge conditioning (trickle charging)
and soft-start (to limit inrush current).
The LTC4065L is available in a tiny 6-lead, low profile
(0.75mm) 2mm
×
2mm DFN package.
APPLICATIO S
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Charger for Li-Ion Coin Cell Batteries
Portable MP3 Players, Wireless Headsets
Bluetooth Applications
Multifunction Wristwatches
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents including 6522118, 6700364.
TYPICAL APPLICATIO
V
IN
4.3V TO 5.5V
C1
1µF
V
CC
R1
510Ω
Complete Charge Cycle (180mAh Battery)
110
100
CHARGE CURRENT (mA)
Standalone Li-Ion Battery Charger
100mA
BAT
90
CONSTANT
CURRENT
80
70
60
50
40
30
20
10
0
0
V
CC
= 5V
R
PROG
= 2k
0.5
1
1.5 2 2.5 3
TIME (HOURS)
LTC4065L
CHRG PROG
EN
GND
R3
2k
+
4.2V
Li-Ion
BATTERY
4065L TA01
U
4.3
CONSTANT
VOLTAGE
CHRG
TRANSITION
4.1
BATTERY VOLTAGE (V)
U
U
3.9
3.7
CHARGE
TERMINATION
3.5
3.3
3.5
4
4.5
4065 TA02
4065lxfa
1
LTC4065L/LTC4065LX
ABSOLUTE
(Note 1)
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
GND 1
CHRG 2
BAT 3
7
6 PROG
5 EN
4 V
CC
V
CC
t < 1ms and Duty Cycle < 1% ................. – 0.3V to 7V
Steady State ........................................... – 0.3V to 6V
BAT, CHRG ................................................. –0.3V to 6V
EN, PROG ....................................... –0.3V to V
CC
+ 0.3V
BAT Short-Circuit Duration ...........................Continuous
BAT Pin Current ................................................. 275mA
PROG Pin Current ........................................... 1.342mA
Junction Temperature (Note 6) ............................ 125°C
Operating Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................ – 65°C to 125°C
DC PACKAGE
6-LEAD (2mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 60°C/W (NOTE 3)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LTC4065LEDC
LTC4065LXEDC
DC PART MARKING
LCBD
LCKS
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 specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= 5V, V
BAT
= 3.8V, V
EN
= 0V unless otherwise specified. (Note 2)
SYMBOL
V
CC
I
CC
I
CCMS
I
CCUV
V
FLOAT
I
BAT
I
BMS
I
BUV
V
UVLO
V
PROG
V
ASD
V
MSH
V
MSL
R
EN
PARAMETER
V
CC
Supply Voltage
Quiescent V
CC
Supply Current
V
CC
Supply Current in Shutdown
V
CC
Supply Current in Undervoltage
Lockout
V
BAT
Regulated Output Voltage
BAT Pin Current
Battery Drain Current in Shutdown
Mode
CONDITIONS
(Note 4)
V
BAT
= 4.5V (Forces I
BAT
and I
PROG
= 0)
V
EN
= 5V
V
CC
< V
BAT
, V
CC
= 3.5V, V
BAT
= 4V
I
BAT
= 2mA
I
BAT
= 2mA, 0°C < T
A
< 85°C
R
PROG
= 13.3k (0.1%), Current Mode
R
PROG
= 1.33k (0.1%), Current Mode
V
EN
= V
CC
●
●
●
●
●
●
●
●
●
●
●
●
MIN
3.75
TYP
120
20
6
MAX
5.5
250
40
11
4.225
4.242
17.5
162
1
4
3.8
3.2
1.02
1.02
100
45
1
UNITS
V
µA
µA
µA
V
V
mA
mA
µA
µA
V
V
V
V
mV
mV
V
V
MΩ
4.175
4.158
13.5
148
–1
0
3.4
2.8
0.98
0.98
60
15
0.6
●
4.2
4.2
15.5
155
0
1
3.6
3.0
1
1
80
30
Battery Drain Current in Undervoltage V
CC
= 3.5V, V
BAT
= 4V
Lockout
V
CC
Undervoltage Lockout Voltage
PROG Pin Voltage
Automatic Shutdown Threshold
Voltage
Manual Shutdown High Voltage
Manual Shutdown Low Voltage
EN Pin Input Resistance
V
CC
Rising
V
CC
Falling
R
PROG
= 1.33k, I
PROG
= 0.75mA
R
PROG
= 13.3k, I
PROG
= 75µA
(V
CC
– V
BAT
), V
CC
Low to High
(V
CC
– V
BAT
), V
CC
High to Low
V
EN
Rising
V
EN
Falling
0.9
1.5
3.3
4065lxfa
2
U
W
U
U
W W
W
LTC4065L/LTC4065LX
ELECTRICAL CHARACTERISTICS
The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are T
A
= 25°C.
V
CC
= 5V, V
BAT
= 3.8V, V
EN
= 0V unless otherwise specified. (Note 2)
SYMBOL
t
SS
I
TRKL
V
TRKL
V
TRHYS
∆V
RECHRG
∆V
UVCL1
∆V
UVCL2
t
TIMER
PARAMETER
Soft-Start Time
Trickle Charge Current
Trickle Charge Threshold Voltage
Trickle Charge Hysteresis Voltage
Recharge Battery Threshold Voltage
(V
CC
– V
BAT
) Undervoltage Current
Limit
Termination Timer
Recharge Time
Low-Battery Trickle Charge Time
V
CHRG
I
CHRG
I
C/10
T
LIM
R
ON
f
BADBAT
D
BADBAT
CHRG Pin Output Low Voltage
CHRG Pin Input Current
End of Charge Indication Current
Level
Junction Temperature in Constant
Temperature Mode
Power FET “ON” Resistance
(Between V
CC
and BAT)
Defective Battery Detection CHRG
Pulse Frequency
Defective Battery Detection CHRG
Pulse Frequency Duty Ratio
I
BAT
= 150mA
V
BAT
= 2.5V
I
CHRG
= 5mA
V
BAT
= 4.5V, V
CHRG
= 5V
R
PROG
= 1.33k (Note 5)
V
BAT
= 2V, R
PROG
= 1.33k (0.1%) (Note 7)
V
BAT
Rising (Note 7)
(Note 7)
V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C
I
BAT
= 90%, R
PROG
= 2k, Programmed Charge Current
I
BAT
= 10%, R
PROG
= 2k, Programmed Charge Current
●
●
●
●
●
●
●
CONDITIONS
MIN
13
2.7
70
150
80
3
1.5
0.75
TYP
170
15.5
2.9
90
100
190
125
4.5
2.25
1.125
60
0
MAX
18
3.05
130
300
150
6
3
1.5
105
1
0.11
UNITS
µs
mA
V
mV
mV
mV
mV
Hrs
Hrs
Hrs
mV
µA
mA/mA
°C
Ω
Hz
%
0.08
0.095
115
1.5
2
75
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 LTC4065L 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:
Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
rated.
Note 4:
Although the LTC4065L functions properly at 3.75V input, full
charge current requires an input voltage greater than the desired final
battery voltage per the
∆V
UVCL1
specification.
Note 5:
I
C/10
is expressed as a fraction of measured full charge current
with indicated PROG resistor.
Note 6:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7:
This parameter is not applicable to the LTC4065LX.
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3
LTC4065L/LTC4065LX
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulation (Float) Voltage
vs Battery Charge Current
4.24
4.23
4.22
V
CC
= 5V
T
A
= 25°C
R
PROG
= 800Ω
4.24
4.23
4.22
V
FLOAT
(V)
V
FLOAT
(V)
V
FLOAT
(V)
4.21
4.20
4.19
4.18
4.17
4.16
0
50
100
150
I
BAT
(mA)
200
250
4065L G01
Charge Current vs Supply Voltage
(Constant Current Mode)
30
25
20
R
PROG
= 13.3k
V
BAT
= 3.8V
T
A
= 25°C
I
BAT
(mA)
I
BAT
(mA)
I
BAT
(mA)
15
10
5
0
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
6
4065L G04
PROG Pin Voltage vs Temperature
(Constant Current Mode)
1.02
V
CC
= 5V
V
BAT
= 3.8V
R
PROG
= 13.3k
1.01
V
PROG
(V)
V
PROG
(V)
1.00
0.6
0.4
R
DS
(Ω)
0.99
0.98
–50
–25
50
25
0
TEMPERATURE (°C)
4
U W
75
4065L G07
Battery Regulation (Float) Voltage
vs Temperature
4.24
4.23
4.22
4.21
4.20
4.19
4.18
4.17
4.16
– 25
50
25
TEMPERATURE (°C)
0
75
100
4065L G02
Battery Regulation (Float) Voltage
vs Supply Voltage
T
A
= 25°C
I
BAT
= 2mA
R
PROG
= 800Ω
4.21
4.20
4.19
4.18
4.17
4.16
–50
4
5
4.5
5.5
SUPPLY VOLTAGE (V)
6
4065L G03
Charge Current vs Battery Voltage
(LTC4065L)
300
250
200
150
100
50
0
0
1
2
3
V
BAT
(V)
4
5
4065L G05
Charge Current vs Temperature
with Thermal Regulation
(Constant Current Mode)
300
250
200
150
100
50
V
CC
= 5V
V
BAT
= 3.8V
R
PROG
= 800Ω
0
100
50
TEMPERATURE (°C)
150
4065L G06
V
CC
= 5V
T
A
= 25°C
R
PROG
= 800Ω
THERMAL CONTROL
LOOP IN OPERATION
0
–50
PROG Pin Voltage
vs Charge Current
1.2
1.0
0.8
1.6
Power FET On Resistance
vs Temperature
2.0
V
CC
= 4V
I
BAT
= 150mA
V
CC
= 5V
T
A
= 25°C
R
PROG
= 800Ω
1.8
1.4
0.2
0
0
50
100
150
I
BAT
(mA)
200
250
4065L G08
1.2
100
1.0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4065L G09
4065lxfa
LTC4065L/LTC4065LX
TYPICAL PERFOR A CE CHARACTERISTICS
Undervoltage Lockout Threshold
Voltage vs Temperature
4.00
3.75
RISE
3.50
RISE
1.0
I
CCMS
(µA)
V
CC
(V)
V
MS
(V)
3.25
3.00
FALL
2.75
2.50
–50
0.5
–50
–25
50
0
25
TEMPERATURE (°C)
EN Pin Current
4.0
3.5
3.0
V
CC
= 5V
T
A
= 25°C
I
BAT
(mA)
2.0
1.5
1.0
0.5
0
2
2.5
3
3.5
V
EN
(V)
4
4.5
5
15
10
5
R
PROG
= 13.3k
0
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
6
4065L G14
I
BAT
(mA)
2.5
I
EN
(µA)
CHRG Pin Output Low Voltage
vs Temperature
140
120
100
V
CC
= 5V
I
CHRG
= 5mA
TIMER ACCURACY (%)
V
CHRG
(mV)
–2
–3
–4
–5
–6
TIMER ACCURACY (%)
80
60
40
20
0
–50
–25
50
25
0
TEMPERATURE (°C)
U W
75
4065L G16
4065L G13
Manual Shutdown Threshold
Voltage vs Temperature
40
Manual Shutdown Supply Current
vs Temperature
V
CC
= 5V
V
EN
= 5V
0.9
30
0.8
FALL
0.7
20
0.6
10
100
–25
50
25
0
TEMPERATURE (°C)
75
100
4065L G11
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4065L G12
Trickle Charge Current
vs Supply Voltage (4065L)
30
25
20
V
BAT
= 2V
T
A
= 25°C
R
PROG
= 800Ω
30
25
20
15
10
5
Trickle Charge Current
vs Temperature (4065L)
V
CC
= 5V
V
BAT
= 2V
R
PROG
= 800Ω
R
PROG
= 13.3k
0
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4065L G15
Timer Accuracy vs Temperature
1
0
–1
V
CC
= 5V
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
Timer Accuracy vs Supply Voltage
T
A
= 25°C
75
100
4065L G10
–7
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
4065L G18
–2.0
4
5
4.5
5.5
SUPPLY VOLTAGE (V)
6
4065L G19
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