LTC4065/LTC4065A
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 4.2V Float Voltage with 0.6% Accuracy
Constant-Current/Constant-Voltage Operation with
Thermal Feedback to Maximize Charging Rate
Without Risk of Overheating
ACPR Pin Indicates Presence of Input Supply
(LTC4065A Only)
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 is a complete constant-current/constant-
voltage linear charger for single-cell lithium-ion batteries.
Its 2mm
×
2mm DFN package and low external component
count make the LTC4065 especially well-suited for por-
table applications. Furthermore, LTC4065 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 LTC4065 automatically enters a low current
state, dropping battery drain current to less than 1µA. With
power applied, LTC4065 can be put into shutdown mode,
reducing the supply current to less than 20µA.
The full-featured LTC4065 also includes automatic re-
charge, low-battery charge conditioning (trickle charg-
ing), soft-start (to limit inrush current) and an open-drain
status pin to indicate the presence of an adequate input
voltage (LTC4065A only).
The LTC4065 is available in a tiny 6-lead, low profile
(0.75mm) 2mm
×
2mm DFN package.
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.
TYPICAL APPLICATIO
V
IN
4.3V TO 5.5V
C1
1µF
R2*
1Ω
V
CC
R1
510Ω
Standalone Li-Ion Battery Charger
500mA
BAT
LTC4065
CHRG PROG
EN
GND
+
R3
2k
4.2V
Li-Ion
BATTERY
4065 TA01
*SERIES 1Ω RESISTOR ONLY NEEDED FOR INDUCTIVE INPUT SUPPLIES
4065fb
U
U
U
1
LTC4065/LTC4065A
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/ACPR*
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 (LTC4065), ACPR (LTC4065A) .. –0.3V to V
CC
+ 0.3V
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
*EN PIN 5 ON LTC4065EDC, ACPR PIN 5 ON LTC4065AEDC
ORDER PART NUMBER
LTC4065EDC
LTC4065AEDC
DC PART MARKING
LBPG
LBVJ
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 (LTC4065 only) 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 (LTC4065) or Float PROG (LTC4065A)
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
(LTC4065),
V
PROG
> V
MS,PROG
(LTC4065A)
●
●
●
●
●
●
●
●
●
●
●
●
MIN
3.75
TYP
120
20
6
MAX
5.5
250
40
11
4.225
4.242
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
4.175
4.158
88
475
–1
0
3.4
2.8
0.98
0.98
60
15
4.2
4.2
100
500
0
1
3.6
3.0
1
1
82
32
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
(LTC4065)
Manual Shutdown Low Voltage
(LTC4065)
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
0.6
●
0.95
1.5
3.3
2
U
MΩ
4065fb
W
U
U
W W
W
LTC4065/LTC4065A
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 (LTC4065 only) unless otherwise specified. (Note 2)
SYMBOL
I
PROG
V
MS,PROG
t
SS
I
TRKL
V
TRKL
V
TRHYS
∆V
RECHRG
∆V
UVCL1
∆V
UVCL2
t
TIMER
PARAMETER
PROG Pin Pull-Up Current
(LTC4065A)
PROG Shutdown Threshold Voltage
(LTC4065A Only)
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
ACPR
I
ACPR
V
CHRG
I
CHRG
I
C/10
T
LIM
R
ON
f
BADBAT
D
BADBAT
ACPR Pin Output Low Voltage
(LTC4065A)
ACPR Pin Input Current (LTC4065A)
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
ACPR
= 5mA
V
CC
= 4V, V
ACPR
= 4V, V
BAT
= 4.5V
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
PROG
> 1V
V
PROG
Rising
●
MIN
TYP
3
MAX
UNITS
µA
3.7
4
180
4.3
V
µs
V
BAT
= 2V, R
PROG
= 2k (0.1%)
V
BAT
Rising
●
35
2.7
70
180
90
3
1.5
0.75
50
2.9
90
100
220
125
4.5
2.25
1.125
60
0
60
0
65
3.05
130
330
150
6
3
1.5
105
1
105
1
0.115
mA
V
mV
mV
mV
mV
Hrs
Hrs
Hrs
mV
µA
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/LTC4065A 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:
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 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.
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3
LTC4065/LTC4065A
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulation (Float) Voltage
vs Battery Charge Current
4.24
4.23
4.22
V
FLOAT
(V)
V
CC
= 5V
T
A
= 25°C
R
PROG
= 2k
4.24
4.23
4.22
V
FLOAT
(V)
4.20
4.19
4.18
4.17
4.16
0
100
200
300
I
BAT
(mA)
400
500
4065 G01
4.20
4.19
4.18
4.17
4.16
–50
– 25
50
25
TEMPERATURE (°C)
0
75
100
4065 G02
V
FLOAT
(V)
4.21
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
75
4065 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
Regulated Output (Float) Voltage
vs Supply Voltage
T
A
= 25°C
I
BAT
= 2mA
R
PROG
= 2k
4.21
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
100
300
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4065 G09
4065fb
LTC4065/LTC4065A
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 (LTC4065)
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
V
CHRG
(mV)
80
60
40
20
0
–50
V
ACPR
(mV)
–25
50
25
0
TEMPERATURE (°C)
U W
75
4065 G16
Manual Shutdown Threshold
Voltage vs Temperature (LTC4065)
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
ACPR Pin Output Low Voltage vs
Temperature (LTC4065A Only)
140
120
100
80
60
40
20
0
–50
V
CC
= 5V
I
ACPR
= 5mA
75
100
4065 G10
–25
50
25
0
TEMPERATURE (°C)
75
100
4065 G17
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