LTC4065-4.4
Standalone 750mA Li-Ion
Battery Charger in 2
×
2 DFN
FEATURES
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DESCRIPTIO
■
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Complete Linear Charger in 2mm
×
2mm DFN
Package
C/10 Charge Current Detection Output
Timer Termination
Charge Current Programmable Up to 750mA with
5% Accuracy
No External MOSFET, Sense Resistor or Blocking
Diode Required
Preset 4.4V 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
Tiny 6-Lead (2mm
×
2mm) DFN Package
The LTC
®
4065-4.4 is a complete constant-current/con-
stant-voltage linear charger for high capacity single-cell
lithium-ion batteries with a 4.4V float voltage. Its 2mm
×
2mm DFN package and low external component count
make the LTC4065-4.4 especially well-suited for portable
applications. Furthermore, LTC4065-4.4 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 feedback regu-
lates 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 LTC4065-4.4 automatically enters a low cur-
rent state, dropping battery drain current to less than
1µA. With power applied, LTC4065-4.4 can be put into shut-
down mode, reducing the supply current to less than 20µA.
The full-featured LTC4065-4.4 also includes automatic
recharge, low-battery charge conditioning (trickle charg-
ing) and soft-start (to limit inrush current).
The LTC4065-4.4 is available in a tiny 6-lead, low profile
(0.75mm) 2mm
×
2mm DFN package.
Complete Charge Cycle (1100mAh Battery)
550
500
450
CHARGE CURRENT (mA)
APPLICATIO S
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Wireless PDAs
Cellular Phones
Portable Electronics
, LT, LTC and LTM 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
4.5V TO
5.5V
Standalone Li-Ion Battery Charger
500mA
V
CC
R1
510Ω
BAT
CONSTANT-CURRENT
CONSTANT-
VOLTAGE
400
350
300
250
200
150
100
50
0
0
0.5
V
CC
= 5V
R
PROG
= 2K
1
1.5
LTC4065-4.4
CHRG PROG
+
R3
2k
C1
1µF
EN
GND
4.4V
Li-Ion
BATTERY*
4065 TA01
*E.G. SANYO BATTERIES: UF553436T OR UF553450T
U
4.5
4.4
4.3
BATTERY VOLTAGE (V)
U
U
4.2
4.1
4.0
3.9
CHRG
TRANSITION 3.8
3.7
CHARGE
3.6
TERMINATION
3.5
3.4
4
4.5
5
4065 TA01b
2 2.5 3 3.5
TIME (HOURS)
406544f
1
LTC4065-4.4
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 ................................................. 800mA
PROG Pin Current ............................................... 800µA
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
LTC4065EDC-4.4
DC PART MARKING
LCKR
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
= 10k (0.1%), Current Mode
R
PROG
= 2k (0.1%), Current Mode
V
EN
= V
CC
●
●
●
●
●
●
●
●
●
●
●
●
MIN
3.75
TYP
120
20
6
MAX
5.5
250
40
11
4.425
4.442
112
525
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
4.375
4.358
88
475
–1
0
3.4
2.8
0.98
0.98
60
15
0.6
●
4.4
4.4
100
500
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
= 2k, I
PROG
= 500µA
R
PROG
= 10k, I
PROG
= 100µA
(V
CC
– V
BAT
), V
CC
Low to High
(V
CC
– V
BAT
), V
CC
High to Low
V
EN
Rising
V
EN
Falling
0.95
1.5
3.3
406544f
2
U
W
U
U
W W
W
LTC4065-4.4
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
= 200mA
V
BAT
= 2.5V
I
CHRG
= 5mA
V
BAT
= 4.5V, V
CHRG
= 5V
R
PROG
= 2k (Note 5)
V
FLOAT
– V
RECHRG
, 0°C < T
A
< 85°C
I
BAT
= 90% Programmed Charge Current
I
BAT
= 10% Programmed Charge Current
●
●
●
●
●
●
CONDITIONS
V
BAT
= 2V, R
PROG
= 2k (0.1%)
V
BAT
Rising
●
MIN
35
2.7
70
180
90
3
1.5
0.75
TYP
180
50
2.9
90
100
220
125
4.5
2.25
1.125
60
0
MAX
65
3.05
130
330
150
6
3
1.5
105
1
0.115
UNITS
µs
mA
V
mV
mV
mV
mV
Hrs
Hrs
Hrs
mV
µA
mA/mA
°C
mΩ
Hz
%
0.085
0.1
115
450
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 LTC4065-4.4 are guaranteed to meet performance specifica-
tions from 0°C to 85°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 LTC4065-4.4 functions properly at 3.75V, 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.
406544f
3
LTC4065-4.4
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulation (Float) Voltage
vs Charge Current
4.44
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
4.42
V
FLOAT
(V)
V
FLOAT
(V)
4.40
4.40
V
FLOAT
(V)
4.38
4.36
0
100
200
300
I
BAT
(mA)
Charge Current vs Supply Voltage
(Constant-Current Mode)
200
175
150
R
PROG
= 10k
V
BAT
= 3.8V
T
A
= 25°C
I
BAT
(mA)
I
BAT
(mA)
I
BAT
(mA)
125
100
75
50
25
0
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
6
4065 G04
PROG Pin Voltage vs Temperature
(Constant-Current Mode)
1.02
V
CC
= 5V
V
BAT
= 3.8V
R
PROG
= 10k
1.01
V
PROG
(V)
V
PROG
(V)
1.00
0.6
0.4
R
DS
(mΩ)
0.99
0.98
–50
–25
50
25
0
TEMPERATURE (°C)
4
U W
400
4065 G01
Battery Regulation (Float) Voltage
vs Temperature
4.44
4.44
Regulated Output (Float) Voltage
vs Supply Voltage
V
CC
= 5V
I
BAT
= 2mA
R
PROG
= 2k
4.42
4.42
4.40
4.38
4.38
500
4.36
–50
– 25
50
25
TEMPERATURE (°C)
0
75
100
4065 G02
4.36
4
5
4.5
5.5
SUPPLY VOLTAGE (V)
6
4065 G03
Charge Current vs Battery Voltage
600
500
400
300
200
100
0
0
1
2
3
V
BAT
(V)
4
5
4065 G05
Charge Current vs Temperature
with Thermal Regulation
(Constant-Current Mode)
600
500
400
300
200
100
V
CC
= 5V
V
BAT
= 3.8V
R
PROG
= 2k
0
100
50
TEMPERATURE (°C)
150
4065 G06
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
THERMAL CONTROL
LOOP IN OPERATION
0
–50
PROG Pin Voltage
vs Charge Current
1.2
1.0
0.8
450
Power FET On-Resistance
vs Temperature
550
V
CC
= 4V
I
BAT
= 400mA
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
500
400
0.2
0
0
100
200
300
I
BAT
(mA)
400
500
4065 G08
350
75
100
4065 G07
300
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4065 G09
406544f
LTC4065-4.4
TYPICAL PERFOR A CE CHARACTERISTICS
Undervoltage Lockout Threshold
Voltage vs Temperature
4.0
3.8
RISE
3.5
V
MS
(V)
I
CCMS
(µA)
V
CC
(V)
3.3
3.0
2.8
2.5
–50
FALL
–25
50
0
25
TEMPERATURE (°C)
EN Pin Current
4.0
3.5
3.0
40
60
V
CC
= 5V
T
A
= 25°C
I
BAT
(mA)
2.0
1.5
1.0
30
20
10
I
BAT
(mA)
2.5
I
EN
(µA)
0.5
0
0
2
2.5
3
3.5
V
EN
(V)
4
CHRG Pin Output Low Voltage
vs Temperature
140
120
V
CC
= 5V
I
CHRG
= 5mA
100
TIMER ACCURACY (%)
V
CHRG
(mV)
–2
–3
–4
–5
–6
–7
–50
–25
50
25
TEMPERATURE (°C)
0
75
100
4065 G18
TIMER ACCURACY (%)
80
60
40
20
0
–50
–25
50
25
0
TEMPERATURE (°C)
U W
75
4065 G16
Manual Shutdown Threshold
Voltage vs Temperature
1.0
Manual Shutdown Supply Current
vs Temperature
40
V
CC
= 5V
V
EN
= 5V
0.9
RISE
0.8
FALL
0.7
30
20
10
0.6
100
0.5
–50
–25
50
25
0
TEMPERATURE (°C)
75
100
4065 G11
0
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4065 G12
Trickle Charge Current
vs Supply Voltage
V
BAT
= 2V
T
A
= 25°C
R
PROG
= 2k
60
50
40
Trickle Charge Current
vs Temperature
V
CC
= 5V
V
BAT
= 2V
R
PROG
= 2k
50
30
20
R
PROG
= 10k
10
0
–50
R
PROG
= 10k
4.5
5
4065 G13
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
6
4065 G14
–25
50
25
0
TEMPERATURE (°C)
75
100
4065 G15
Timer Accuracy vs Temperature
1
0
–1
V
CC
= 5V
2.0
1.5
Timer Accuracy vs Supply Voltage
T
A
= 25°C
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
75
100
4065 G10
4
5
4.5
5.5
SUPPLY VOLTAGE (V)
6
4065 G19
406544f
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