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■
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Charge Current Programmable Up to 1A
Charges Single-Cell Li-Ion Batteries Directly from
USB Port
Preset 4.375V Float Voltage with ±0.4% Accuracy
Thermistor Input for Temperature Qualified
Charging
Input Supply Present Logic Output
Thermal Regulation Maximizes Charge Rate
Without Risk of Overheating
Programmable Charge Current Detection/
Termination
Programmable Charge Termination Timer
Smart Pulsing Error Feature
SmartStart
TM
Prolongs Battery Life
20µA Charger Quiescent Current in Shutdown
Available in a Low Profile (0.75mm) 10-Lead
(3mm
×
3mm) DFN Package
The LTC
®
4061-4.4 is a full-featured, flexible, standalone
linear charger for single-cell 4.375V Lithium-Ion batteries. It
is capable of operating within USB power specifications.
Both programmable time and programmable current
based termination schemes are available. Furthermore,
the CHRG open-drain status pin can be programmed to
indicate the battery charge state according to the needs
of the application. Additional safety features designed to
maximize battery lifetime and reliability include NTC bat-
tery temperature sensing and the SmartStart charging
algorithm.
No external sense resistor or external blocking diode is
required for charging due to the internal MOSFET archi-
tecture. Internal thermal feedback regulates the charge
current to maintain a constant die temperature during high
power operation or high ambient temperature conditions.
The charge current is programmed with an external resis-
tor. With power applied, the LTC4061-4.4 can be put into
shutdown mode to reduce the supply current to 20µA and
the battery drain current to less than 5µA.
Other features include smart recharge, USB C/5 cur-
rent programming input, undervoltage lockout and AC
Present logic output.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
SmartStart is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6522118.
APPLICATIO S
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Handheld Computers
Portable MP3 Players
Digital Cameras
800mA Single-Cell Li-Ion Battery Charger
(C/10 Termination)
V
IN
4.5V TO 8V
1µF
800mA
V
CC
EN
CHRG
C/5
LTC4061-4.4
TIMER
ACPR
PROG
I
DET
NTC
GND
BAT
CHARGE CURRENT (mA)
619Ω
U
TYPICAL APPLICATIO
Complete Charge Cycle (1100mAh Battery)
900
800
700
600
500
400
300
200
100
0
0
V
CC
= 5V
T
A
= 25°C
0.5
1.0
1.5
TIME (HOURS)
2.0
BATTERY
VOLTAGE
BATTERY
CURRENT
4.5
4.4
4.3
BATTERY VOLTAGE (V)
4.2
4.1
4.0
3.9
3.8
3.7
3.6
2.5
+
4.4V
SINGLE-CELL
Li-Ion BATTERY*
*SANYO BATTERIES:
UF553436T OR
UF553450T
40614.4 TA01a
U
FEATURES
LTC4061-4.4
Standalone Linear Li-Ion Battery
Charger with Thermistor Input
DESCRIPTIO
U
40614.4 TA01b
406144fb
1
LTC4061-4.4
(Note 1)
TOP VIEW
BAT
NTC
TIMER
ACPR
CHRG
1
2
3
4
5
11
10 V
CC
9 PROG
8 I
DET
7 EN
6 C/5
Input Supply Voltage (V
CC
) ........................ –0.3V to 10V
EN, ACPR, CHRG, NTC, PROG,
C/5, BAT ..................................................... –0.3V to 10V
TIMER, I
DET
.................................... –0.3V to V
CC
+ 0.3V
BAT Short-Circuit Duration............................ Continuous
V
CC
Pin Current ...........................................................1A
BAT Pin Current ..........................................................1A
Maximum Junction Temperature (Note 5) ............ 125°C
Operating Temperature Range (Note 2) ...–40°C to 85°C
Storage Temperature Range...................–65°C to 125°C
DD PACKAGE
10-LEAD (3mm
×
3mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 3)
EXPOSED PAD IS GROUND (PIN 11)
MUST BE SOLDERED TO PCB
ORDER PART NUMBER
DD PART MARKING
LTC4061EDD-4.4
LBRD
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
SYMBOL
V
CC
I
CC
PARAMETER
Input Supply Voltage
Input Supply Current
The
●
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
●
MIN
4.5
●
●
●
TYP
240
130
20
MAX
8
500
300
50
4.392
4.4
107
840
–7
±5
1.03
1.03
0.25
0.25
14
100
3
3.9
230
75
5
1
1
UNITS
V
µA
µA
µA
V
V
mA
mA
µA
µA
V
V
V
V
mA
mA
V
mV
V
mV
mV
mV
MΩ
V
mV
V
mV
406144fb
Charge Mode (Note 4), R
PROG
= 10k
Standby Mode, Charge Terminated
Shutdown (EN = 5V, V
CC
< V
BAT
or V
CC
< V
UV
)
0 ≤ T
A
≤ 85°C
R
PROG
= 10k, Constant Current Mode
R
PROG
= 1.25k, Constant Current Mode
Standby Mode, Charge Terminated, V
BAT
= 4.4V
Shutdown Mode, V
BAT
= 4.2V
R
PROG
= 10k, Constant Current Mode
R
PROG
= 1.25k, Constant Current Mode
I
ACPR
= 5mA
I
CHRG
= 5mA
V
BAT
< V
TRIKL
, R
PROG
= 10k
V
BAT
< V
TRIKL
, R
PROG
= 1.25k
V
BAT
Rising
Hysteresis
From Low to High
Hysteresis
V
CC
from Low to High, V
BAT
= 4.5V
V
CC
from High to Low, V
BAT
= 4.5V
V
FLOAT
I
BAT
V
BAT
Regulated Output Voltage
BAT Pin Current
4.358
4.35
●
●
●
●
4.375
4.375
100
800
–3.5
±1
1
1
0.1
0.1
93
760
V
PROG
V
ACPR
V
CHRG
I
TRIKL
V
TRIKL
V
UV
V
ASD
R
EN
V
EN
V
CT
PROG Pin Voltage
ACPR Output Low Voltage
CHRG Output Low Voltage
Trickle Charge Current
Trickle Charge Threshold Voltage
V
CC
Undervoltage Lockout Voltage
V
CC
– V
BAT
Lockout Threshold Voltage
EN Pin Pull-Down Resistor
EN Input Threshold Voltage
Charge Termination Mode Threshold
Voltage
0.97
0.97
6
60
2.8
3.7
145
10
●
10
80
2.9
100
3.8
200
190
45
3.4
0.7
70
0.7
50
2
0.4
0.4
EN Rising, 4.5V < V
CC
< 8V
Hysteresis
V
TIMER
from High to Low
Hysteresis
2
U
W
U
U
W W
W
ABSOLUTE
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
LTC4061-4.4
ELECTRICAL CHARACTERISTICS
SYMBOL
V
UT
I
DETECT
PARAMETER
User Termination Mode Threshold
Voltage
Charge Current Detection Threshold
The
●
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
V
TIMER
from Low to High
Hysteresis
R
DET
= 1k, 0 ≤ T
A
≤ 85°C
R
DET
= 2k, 0 ≤ T
A
≤ 85°C
R
DET
= 10k, 0 ≤ T
A
≤ 85°C
R
DET
= 20k, 0 ≤ T
A
≤ 85°C
V
FLOAT
– V
RECHRG,
0 ≤ T
A
≤ 85°C
I
BAT
from 0 to I
CHG
Current Termination Mode
C
TIMER
= 0.1µF
●
MIN
3.9
90
45
8
3.8
65
0.8
3
2.55
2
0.4
TYP
4.2
50
100
50
10
5
100
100
1.5
7
3
3.4
0.7
70
0.35 • V
CC
0.36 • V
CC
0.76 • V
CC
0.75 • V
CC
85
50
1.5
1.5
105
375
MAX
UNITS
V
mV
mA
mA
mA
mA
mV
µs
ms
ms
hr
MΩ
V
mV
V
V
V
V
mV
mV
Hz
Hz
°C
mΩ
∆V
RECHRG
t
SS
t
TERM
t
RECHRG
t
TIMER
R
C/5
V
C/5
V
NTC-HOT
V
NTC-COLD
V
NTC-DIS
f
CHRG
T
LIM
R
ON
Recharge Threshold Voltage
Soft-Start Time
Termination Comparator Filter Time
Recharge Comparator Filter Time
Charge Cycle Time
C/5 Pin Pull-Down Resistor
C/5 Input Threshold Voltage
NTC Pin Hot Threshold Voltage
NTC Pin Cold Threshold Voltage
NTC Pin Disable Threshold Voltage
NTC Fault Pulsing Frequency
Junction Temperature in Constant
Temperature Mode
Power FET “ON” Resistance
(Between V
CC
and BAT)
110
55
12
6.2
135
2.5
14
3.45
5
1
C/5 Rising, 4.5V < V
CC
< 8V
Hysteresis
V
NTC
Falling
V
NTC
Rising
V
NTC
Rising
V
NTC
Falling
V
NTC
Falling
Hysteresis
Current/User Termination Mode
Time Termination Mode C
TIMER
= 0.1µF
70
100
1
2
V
BAT
= 4V, I
CC
= 175mA, R
PROG
= 2k
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 LTC4061-4.4 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 correctly solder the exposed pad of the package to the
PC board will result in a thermal resistance much higher than 40°C/W.
Note 4:
Supply current includes PROG pin current and I
DET
pin current
(approximately 100µA each) but does not include any current delivered to
the battery through the BAT pin (approximately 100mA).
Note 5:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions.
Overtemperature protection will become active at a junction temperature
greater than the maximum operating temperature. Continuous operation
above the specified maximum operating junction temperature may impair
device reliability.
406144fb
3
LTC4061-4.4
TYPICAL PERFOR A CE CHARACTERISTICS
Battery Regulated Output (Float)
Voltage vs Charge Current
4.42
4.40
4.38
V
FLOAT
(V)
V
FLOAT
(V)
V
FLOAT
(V)
4.36
4.34
4.32
4.30
4.28
4.26
0
200
800
600
CHARGE CURRENT (mA)
400
1000
4.365
4.360
–50
4.380
4.375
4.370
V
CC
= 5V
R
PROG
= 1k
4.390
4.385
Charge Current vs PROG Pin
Voltage
1200
1000
800
I
BAT
(mA)
600
400
200
0
V
PROG
(V)
V
CC
= 5V
R
PROG
= 1k
C/5 = 5V
V
TIMER
= 5V
1.006
1.004
1.002
1.000
V
PROG
(V)
0
0.2
0.4
0.6
V
PROG
(V)
0.8
Trickle Charge Current vs
Temperature
84
V
CC
= 5V
V
BAT
= 2.5V
R
PROG
= 1.25k
2.96
2.94
2.92
2.90
2.88
78
2.86
76
–50
82
I
TRICKLE
(mA)
V
TRICKLE
(V)
I
BAT
(mA)
80
–25
0
25
50
TEMPERATURE (°C)
4
U W
40614.4 G01
T
A
= 25°C unless otherwise noted.
Battery Regulated Output (Float)
Voltage vs Supply Voltage
4.42
4.40
4.38
4.36
4.34
4.32
4.30
4.28
R
PROG
= 1k
T
A
= 25°C
I
BAT
= 10mA
5.0 5.5
6.0 6.5
V
CC
(V)
40614.4 G02
40614.4 G03
Battery Regulated Output (Float)
Voltage vs Temperature
V
CC
= 5V
R
PROG
= 10k
–25
0
25
50
TEMPERATURE (°C)
75
100
4.26
4.0 4.5
7.0 7.5
8.0
PROG Pin Voltage vs Temperature
(Constant-Current Mode)
R
PROG
= 10k
C/5 = V
CC
1.006
1.004
1.002
1.000
0.998
0.996
PROG Pin Voltage vs V
CC
(Constant-Current Mode)
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
C/5 = 5V
V
CC
= 8V
V
CC
= 4.5V
0.998
0.996
0.994
–50
1.0
1.2
–25
0
25
50
TEMPERATURE (°C)
75
100
0.994
4.0
4.5
5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
40614.4 G04
40614.4 G05
40614.4 G06
Trickle Charge Threshold Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 1.25k
550
Charge Current vs Battery Voltage
C/5 = 5V
450
350
250
V
CC
= 5V
R
PROG
= 2k
150
C/5 = 0V
50
3.2
3.0
75
100
2.84
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
3.6
3.4
V
BAT
(V)
3.8
4.0
40614.4 G09
40614.4 G07
40614.4 G08
406144fb
LTC4061-4.4
TYPICAL PERFOR A CE CHARACTERISTICS
Internal Charge Timer vs
Temperature
195
190
t
TIMER
(MINUTES)
185
180
175
170
165
–50
C
TIMER
= 0.1µF
–25
0
25
50
TEMPERATURE (°C)
75
100
1.60
1.55
1.50
f
CHRG
(Hz)
1.45
1.40
1.35
1.30
4.0
1.3
f
CHRG
(Hz)
V
CC
= 4.5V
V
CC
= 8V
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
ONSET OF THERMAL
REGULATION
R
PROG
= 1.25k
R
PROG
= 2k
I
BAT
(mA)
102
104
800
I
BAT
(mA)
600
V
RECHARGE
(V)
400
200
0
–50
–25
50
25
0
75
TEMPERATURE (°C)
Power FET “ON” Resistance vs
Temperature
500
V
CC
= 4V
I
BAT
= 200mA
3.900
3.875
3.850
450
R
DS(ON)
(mΩ)
I
BAT
(mA)
V
UV
(V)
400
350
300
250
–50
–25
0
25
50
TEMPERATURE (°C)
U W
40614.4 G10
T
A
= 25°C unless otherwise noted.
NTC Fault Pulsing Frequency
vs Temperature
1.7
C
TIMER
= 0.1µF
NTC Fault Pulsing Frequency
vs V
CC
C
TIMER
= 0.1µF
1.6
V
CC
= 8V
V
CC
= 4.5V
1.5
1.4
4.5
5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
1.2
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
40614.4 G11
40614.4 G12
Charge Current vs Supply Voltage
V
CC
= 5V
V
BAT
= 4V
C/5 = 5V
R
PROG
= 10k
4.36
4.34
4.32
4.30
Recharge Threshold Voltage vs
Temperature
100
V
CC
= 8V
4.28
4.26
V
CC
= 4.5V
98
100
125
96
4.0
4.5
5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
4.24
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
40614.4 G13
40614.4 G14
40614.4 G15
Undervoltage Lockout Voltage vs
Temperature
900
800
700
600
500
400
300
200
100
–25
50
25
0
TEMPERATURE (°C)
75
100
0
Charge Current vs Battery Voltage
3.825
3.800
3.775
3.750
3.725
75
100
3.700
– 50
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
BAT
(V)
40614.4 G18
40614.4 G16
40614.4 G17
406144fb
5
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