LTC4061
Standalone Linear Li-Ion
Battery Charger with
Thermistor Input
FeaTures
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DescripTion
The LTC
®
4061 is a full-featured, flexible, standalone linear
charger for single-cell 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
battery temperature sensing and the SmartStart charg-
ing 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 condi-
tions. The charge current is programmed with an external
resistor. With power applied, the LTC4061 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.
Charge Current Programmable Up to 1A
Charges Single-Cell Li-Ion Batteries Directly from
USB Port
Preset Charge Voltage with ±0.35% 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™ Prolongs Battery Life
20µA Charger Quiescent Current in Shutdown
Available in a Low Profile (0.75mm) 10-Lead
(3mm
×
3mm) DFN Package
applicaTions
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Handheld Computers
Portable MP3 Players
Digital Cameras
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SmartStart, ThinSOT and PowerPath are trademarks of Linear Technology Corporation. All
other trademarks are the property of their respective owners. Protected by U.S. Patents
including 6522118.
Typical applicaTion
800mA Single-Cell Li-Ion Battery Charger
(C/10 Termination)
V
CC
1µF
EN
C/5
BAT
CHRG
LTC4061
ACPR
NTC
GND
4061 TA01a
Complete Charge Cycle (1100mAh Battery)
900
800
CHARGE CURRENT (mA)
700
600
500
400
300
200
100
0
0
V
CC
= 5V
T
A
= 25°C
0.5
1.5
1.0
2.0
TIME (HOURS)
2.5
BATTERY
VOLTAGE
BATTERY
CURRENT
4.3
4.2
4.1
BATTERY VOLTAGE (V)
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.0
4061fd
V
IN
4.3V TO 8V
800mA
TIMER
PROG
I
DET
619
+
4.2V
SINGLE-CELL
Li-Ion BATTERY
4061 TA01b
LTC4061
absoluTe MaxiMuM raTings
(Note 1)
pin conFiguraTion
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 (PIN 11) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC4061EDD#PBF
TAPE AND REEL
LTC4061EDD#TRPBF
PART MARKING
LBJS
PACKAGE DESCRIPTION
10-Lead (3mm
×
3mm) Plastic DFN
TEMPERATURE RANGE
–40°C to 85°C
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/
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.
SYMBOL
V
CC
I
CC
V
FLOAT
I
BAT
PARAMETER
Input Supply Voltage
Input Supply Current
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
= 4.2V
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
= 4.3V
V
CC
from High to Low, V
BAT
= 4.3V
6
60
2.8
3.7
145
10
l
l
l
l
elecTrical characTerisTics
CONDITIONS
l
l
l
l
MIN
4.3
TYP
240
130
20
MAX
8
500
300
50
4.215
4.225
107
840
–7
±5
1.03
1.03
0.25
0.25
14
100
3
3.9
230
75
UNITS
V
µA
µA
µA
V
V
mA
mA
µA
µA
V
V
V
V
mA
mA
V
mV
V
mV
mV
mV
4061fd
V
BAT
Regulated Output Voltage
BAT Pin Current
4.185
4.175
93
760
4.2
4.2
100
800
–3.5
±1
1
1
0.1
0.1
10
80
2.9
100
3.8
200
190
45
V
PROG
V
ACPR
V
CHRG
I
TRIKL
V
TRIKL
V
UV
V
ASD
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
0.97
0.97
LTC4061
elecTrical characTerisTics
SYMBOL
R
EN
V
EN
V
CT
V
UT
I
DETECT
PARAMETER
EN
Pin Pull-Down Resistor
EN
Input Threshold Voltage
Charge Termination Mode Threshold
Voltage
User Termination Mode Threshold
Voltage
Charge Current Detection Threshold
EN
Rising, 4.3V < V
CC
< 8V
Hysteresis
V
TIMER
from High to Low
Hysteresis
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 ≤ TA ≤ 85°C
I
BAT
from 0 to I
CHRG
Current Termination Mode
C
TIMER
= 0.1µF
l
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
2
0.4
0.4
3.9
90
45
8
3.8
65
0.8
3
2.55
2
0.4
TYP
3.4
0.7
70
0.7
50
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
MAX
5
1
1
UNITS
MΩ
V
mV
V
mV
V
mV
110
55
12
6.2
135
2.5
14
3.45
5
1
mA
mA
mA
mA
mV
µs
ms
ms
hr
MΩ
V
mV
V
V
V
V
ΔV
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
)
C/5
Rising, 4.3V < 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
85
50
1.5
1.5
105
100
mV
mV
Hz
Hz
°C
mΩ
1
2
V
BAT
= 3.85V, I
CC
= 175mA, R
PROG
= 2k
375
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 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.
4061fd
LTC4061
Typical perForMance characTerisTics
Battery Regulated Output (Float)
Voltage vs Charge Current
4.26
4.24
4.22
V
FLOAT
(V)
V
FLOAT
(V)
V
BAT
(V)
4.20
4.18
4.16
4.14
4.12
4.10
0
200
800
600
CHARGE CURRENT (mA)
400
1000
4061 G01
Battery Regulated Output (Float)
Voltage vs Temperature
4.215
4.210
4.205
4.200
4.195
4.190
4.185
–50
V
CC
= 5V
R
PROG
= 10k
4.26
4.24
4.22
4.20
4.18
4.16
4.14
4.12
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G02
Battery Regulated Output (Float)
Voltage vs Supply Voltage
R
PROG
= 1k
T
A
= 25°C
I
BAT
= 10mA
V
CC
= 5V
R
PROG
= 1k
4.10
4.0 4.5
5.0 5.5
6.0 6.5
V
CC
(V)
7.0 7.5
8.0
4061 G03
Charge Current vs PROG Pin
Voltage
1200
1000
800
I
BAT
(mA)
V
PROG
(V)
600
400
200
0
V
CC
= 5V
R
PROG
= 1k
C/5
= 5V
V
TIMER
= 5V
1.006
1.004
1.002
1.000
PROG Pin Voltage vs Temperature
(Constant-Current Mode)
R
PROG
= 10k
C/5
= V
CC
1.006
1.004
1.002
V
PROG
(V)
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
= 4.3V
0.998
0.996
0.994
–50
0
0.2
0.4
0.6
V
PROG
(V)
0.8
1.0
1.2
4061 G04
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G05
0.994
4.0
4.5
5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
4061 G06
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
Trickle Charge Threshold Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 1.25k
550
Charge Current vs Battery Voltage
C/5
= 5V
82
I
TRICKLE
(mA)
V
TRICKLE
(V)
I
BAT
(mA)
450
350
80
250
V
CC
= 5V
R
PROG
= 2k
150
C/5 = 0V
50
3.2
3.0
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G07
2.84
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G08
3.6
3.4
V
BAT
(V)
3.8
4.0
4061 G09
4061fd
LTC4061
Typical perForMance 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
4061 G10
NTC Fault Pulsing Frequency
vs V
CC
1.60
1.55
1.50
f
CHRG
(Hz)
1.45
1.40
1.35
1.30
4.0
1.3
f
CHRG
(Hz)
C
TIMER
= 0.1µF
1.7
NTC Fault Pulsing Frequency
vs Temperature
C
TIMER
= 0.1µF
V
CC
= 4.3V
V
CC
= 8V
1.6
V
CC
= 8V
V
CC
= 4.3V
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
4061 G11
0
25
50
TEMPERATURE (°C)
75
100
4061 G12
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
ONSET OF THERMAL
REGULATION
R
PROG
= 1.25k
I
BAT
(mA)
R
PROG
= 2k
102
104
Charge Current vs Supply Voltage
V
CC
= 5V
V
BAT
= 4V
C/5
= 5V
R
PROG
= 10k
4.16
4.14
4.12
4.10
4.08
4.06
96
Recharge Threshold Voltage
vs Temperature
800
I
BAT
(mA)
600
V
RECHARGE
(V)
100
V
CC
= 8V
V
CC
= 4.3V
400
200
98
0
–50
–25
50
0
75
25
TEMPERATURE (°C)
100
125
4.0
4.5 5.0
5.5
6.0
V
CC
(V)
6.5
7.0
7.5
8.0
4.04
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G15
4061 G13
4061 G14
Power FET On-Resistance
vs Temperature
500
V
CC
= 4V
I
BAT
= 200mA
3.900
3.875
3.850
Undervoltage Lockout Voltage
vs Temperature
900
800
700
600
I
BAT
(mA)
500
400
300
200
100
–25
50
25
0
TEMPERATURE (°C)
75
100
4061 G17
Charge Current vs Battery Voltage
450
V
UV
(V)
400
3.825
3.800
3.775
3.750
3.725
350
300
250
–50
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G16
3.700
– 50
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
V
BAT
(V)
4061 G18
4061fd
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