LTC4061
1
4061fa
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
+
V
CC
TIMER
PROG
I
DET
BAT
CHRG
ACPR
NTC
LTC4061
GND
800mA
619
1F
V
IN
4.3V TO 8V
4061 TA01a
4.2V
SINGLE CELL
Li-Ion BATTERY
C/5
EN
TIME (HOURS)
0
0.5
1.5
2.5
3.0
CHARGE CURRENT (mA)
BA
TTER
Y VOL
T
AGE (V)
2.0
900
800
700
600
500
400
300
200
100
0
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
4061 TA01b
1.0
BATTERY
CURRENT
BATTERY
VOLTAGE
V
CC
= 5V
T
A
= 25C
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 Qualifi ed
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
20A Charger Quiescent Current in Shutdown
Available in a Low Profi le (0.75mm) 10-Lead
(3mm 3mm) DFN Package
Standalone Linear Li-Ion Battery
Charger with Thermistor Input
The LTC
4061 is a full-featured, fl exible, standalone linear
charger for single-cell Lithium-Ion batteries. It is capable
of operating within USB power specifi cations.
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
TM
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 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 20A and
the battery drain current to less than 2A.
Other features include smart recharge, USB C/5 cur-
rent programming input, undervoltage lockout and AC
Present logic.
800mA Single Cell Li-Ion Battery Charger
(C/10 Termination)
Handheld Computers
Portable MP3 Players
Digital Cameras
Complete Charge Cycle (1100mAh Battery)
SmartStart is a trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6522118.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
LTC4061
2
4061fa
ABSOLUTE
AXI U
RATI GS
W
W
W
U
FOR ATIO
PACKAGE/ORDER I
U
U
W
ELECTRICAL CHARACTERISTICS
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) ............ 125C
Operating Temperature Range (Note 2) ...40C to 85C
Storage Temperature Range ...................65C to 125C
ORDER PART
NUMBER
DD PART
MARKING
T
JMAX
= 125C,
JA
= 40C/W (NOTE 3)
EXPOSED PAD IS GROUND (PIN 11)
MUST BE SOLDERED TO PCB
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
LBJS
LTC4061EDD
(Note 1)
The
denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25C. V
CC
= 5V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Input
Supply
Voltage
4.3
8
V
I
CC
Input Supply Current
Charge Mode (Note 4), R
PROG
= 10k
240 500
A
Standby Mode, Charge Terminated
130 300
A
Shutdown
(EN = 5V, V
CC
< V
BAT
or V
CC
< V
UV
)
20 50
A
V
FLOAT
V
BAT
Regulated Output Voltage
4.185
4.2
4.215
V
0
T
A
85C
4.175
4.2
4.225
V
I
BAT
BAT Pin Current
R
PROG
= 10k, Constant Current Mode
93
100 107
mA
R
PROG
= 1.25k, Constant Current Mode
760
800
840
mA
Standby Mode, Charge Terminated
1 2
A
Shutdown
Mode
1 2
A
V
PROG
PROG
Pin
Voltage
R
PROG
= 10k, Constant Current Mode
0.97
1
1.03
V
R
PROG
= 1.25k, Constant Current Mode
0.97
1
1.03
V
V
A
C
P
R
ACPR Output Low Voltage
I
A
C
P
R
= 5mA
0.1
0.25
V
V
C
H
R
G
CHRG Output Low Voltage
I
C
H
R
G
= 5mA
0.1
0.25
V
I
TRIKL
Trickle Charge Current
V
BAT
< V
TRIKL
, R
PROG
= 10k
6
10
14
mA
V
BAT
< V
TRIKL
, R
PROG
= 1.25k
60
80
100
mA
V
TRIKL
Trickle
Charge
Threshold
Voltage
V
BAT
Rising
2.8
2.9
3
V
Hysteresis
100 mV
V
UV
V
CC
Undervoltage Lockout Voltage
From Low to High
3.7
3.8
3.9
V
Hysteresis
200 mV
V
ASD
V
CC
V
BAT
Lockout Threshold Voltage
V
CC
from Low to High, V
BAT
=
4.3V
145 190 230 mV
V
CC
from High to Low, V
BAT
= 4.3V
10
45
75
mV
R
E
N
EN Pin Pull-Down Resistor
2
3.4
5
M
V
E
N
EN Input Threshold Voltage
EN Rising, 4.3V < V
CC
< 8V
0.4
0.7
1
V
Hysteresis
70 mV
V
CT
Charge Termination Mode Threshold
V
TIMER
from High to Low
0.4
0.7
1
V
Voltage
Hysteresis
50 mV
TOP VIEW
10
9
6
7
8
11
4
5
3
2
1
V
CC
PROG
I
DET
EN
C/5
BAT
NTC
TIMER
ACPR
CHRG
LTC4061
3
4061fa
ELECTRICAL CHARACTERISTICS
The
denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25C. V
CC
= 5V, unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
UT
User
Termination
Mode
Threshold
V
TIMER
from Low to High
3.9
4.2
V
Voltage
Hysteresis
50 mV
I
DETECT
Charge
Current
Detection
Threshold
R
DET
= 1k, 0 T
A
85C
90
100
110
mA
R
DET
= 2k, 0 T
A
85C
45
50
55
mA
R
DET
= 10k, 0 T
A
85C
8
10
12
mA
R
DET
= 20k, 0 T
A
85C
3.8
5
6.2
mA
V
RECHRG
Recharge Threshold Voltage
V
FLOAT
V
RECHRG,
0 T
A
85C
65
100
135
mV
t
SS
Soft-Start
Time
I
BAT
from 0 to I
CHRG
100
s
t
TERM
Termination Comparator Filter Time
Current Termination Mode
0.8
1.5
2.5
ms
t
RECHRG
Recharge Comparator Filter Time
3
7
14
ms
t
TIMER
Charge
Cycle
Time
C
TIMER
=
0.1F
2.55 3 3.45 hr
R
C
/
5
C/5 Pin Pull-Down Resistor
2
3.4
5
M
V
C
/
5
C/5 Input Threshold Voltage
C/5 Rising, 4.3V < V
CC
< 8V
0.4
0.7
1
V
Hysteresis
70 mV
V
NTC-HOT
NTC Pin Hot Threshold Voltage
V
NTC
Falling
0.35 V
CC
V
V
NTC
Rising
0.36 V
CC
V
V
NTC-COLD
NTC Pin Cold Threshold Voltage
V
NTC
Rising
0.76 V
CC
V
V
NTC
Falling
0.75 V
CC
V
V
NTC-DIS
NTC
Pin
Disable
Threshold
Voltage
V
NTC
Falling
70
85
100
mV
Hysteresis
50 mV
f
CHRG
NTC Fault Pulsing Frequency
Current/User Termination Mode
1.5
Hz
Time
Termination
Mode
C
TIMER
= 0.1F
1
1.5
2
Hz
T
LIM
Junction Temperature in Constant
105
C
Temperature
Mode
R
ON
Power FET "ON" Resistance
V
BAT
= 3.85V, I
CC
= 175mA, R
PROG
=
2k
375 m
(Between
V
CC
and BAT)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2: The LTC4061 is guaranteed to meet performance specifi cations
from 0C to 70C. Specifi cations over the 40C to 85C 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 40C/W.
Note 4: Supply current includes PROG pin current and I
DET
pin current
(approximately 100A 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 specifi ed maximum operating junction temperature may impair
device reliability.
LTC4061
4
4061fa
CHARGE CURRENT (mA)
0
V
BA
T
(V)
600
1000
4061 G01
200
400
800
4.26
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
TEMPERATURE (C)
50
V
FLOAT
(V)
4.215
4.210
4.205
4.200
4.195
4.190
4.185
25
0
25
50
4061 G02
75
100
50
25
0
25
50
75
100
50
25
0
25
50
75
100
TEMPERATURE (C)
V
PROG
(V)
4061 G05
1.006
1.004
1.002
1.000
0.998
0.996
0.994
V
PROG
(V)
0
I
BAT
(mA)
1200
1000
800
600
400
200
0
0.2
0.4
0.6
0.8
4061 G04
1.0
1.2
TEMPERATURE (C)
I
TRICKLE
(mA)
84
82
80
78
76
4061 G07
50
25
0
25
50
75
100
TEMPERATURE (C)
V
TRICKLE
(V)
2.96
2.94
2.92
2.90
2.88
2.86
2.84
4061 G08
V
BAT
(V)
3.0
I
BAT
(mA)
550
450
350
250
150
50
3.8
4061 G09
3.2
3.4
3.6
4.0
V
CC
= 5V
R
PROG
= 1k
V
CC
= 5V
R
PROG
= 10k
R
PROG
= 10k
C/5 = V
CC
V
CC
= 5V
V
BAT
= 2.5V
R
PROG
= 1.25k
V
CC
= 5V
R
PROG
= 1.25k
V
CC
= 5V
R
PROG
= 1k
C/5 = 5V
V
TIMER
= 5V
V
CC
= 5V
R
PROG
= 2k
V
CC
= 4.3V
V
CC
= 8V
C/5 = 5V
C/5 = 0V
4061 G03
V
CC
(V)
4.0
V
FLOA
T
(V)
8.0
5.0
6.0
7.0
4.5
5.5
6.5
7.5
4.26
4.24
4.22
4.20
4.18
4.16
4.14
4.12
4.10
R
PROG
= 1k
T
A
= 25C
I
BAT
= 10mA
4061 G06
V
CC
(V)
4.0
V
PROG
(V)
8.0
5.0
6.0
7.0
1.006
1.004
1.002
1.000
0.998
0.996
0.994
4.5
5.5
6.5
7.5
V
CC
= 5V
V
BAT
= 4V
R
PROG
= 10k
C/5 = 5V
TYPICAL PERFOR
U
W
CE CHARACTERISTICS
A
Battery Regulated Output (Float)
Voltage vs Charge Current
Battery Regulated Output (Float)
Voltage vs Temperature
PROG Pin Voltage vs Temperature
(Constant-Current Mode)
Charge Current vs PROG Pin
Voltage
Trickle Charge Current vs
Temperature
Trickle Charge Threshold Voltage
vs Temperature
Charge Current vs Battery Voltage
Battery Regulated Output (Float)
Voltage vs Supply Voltage
PROG Pin Voltage vs V
CC
(Constant-Current Mode)
LTC4061
5
4061fa
TEMPERATURE (C)
50
25
0
I
BA
T
(mA)
400
1000
0
50
75
4061 G13
4061 G14
200
800
600
25
100
125
R
PROG
= 1.25k
ONSET OF THERMAL
REGULATION
R
PROG
= 2k
V
CC
(V)
4.0
I
BA
T
(mA)
8.0
5.0
6.0
7.0
104
102
100
98
96
4.5
5.5
6.5
7.5
TEMPERATURE (C)
50
V
RECHARGE
(V)
4.16
4.14
4.12
4.10
4.08
4.06
4.04
25
0
25
50
4061 G15
75
100
TEMPERATURE (C)
50
500
450
400
350
300
250
25
0
25
50
4061 G16
75
100
V
CC
= 4V
I
BAT
= 200mA
TEMPERATURE (C)
50
1.7
1.6
1.5
1.4
1.3
1.2
25
0
25
50
4061 G12
75
100
C
TIMER
= 0.1F
V
CC
= 8V
V
CC
= 4.3V
V
CC
= 8V
V
CC
= 4.3V
V
CC
= 5V
V
BAT
= 4V
C/5 = 5V
R
PROG
= 10k
4061 G11
V
CC
(V)
4.0
f
CHRG
(Hz)
8.0
5.0
6.0
7.0
1.60
1.55
1.50
1.45
1.40
1.35
1.30
4.5
5.5
6.5
7.5
f
CHRG
(Hz)
C
TIMER
= 0.1F
50
25
0
25
50
75
100
TEMPERATURE (C)
t
TIMER
(MINUTES)
195
190
185
180
175
170
165
4061 G10
C
TIMER
= 0.1F
V
CC
= 4.3V
V
CC
= 8V
4061 G17
4061 G18
TEMPERATURE (C)
50
25
75
25
0
50
100
V
UV
(V)
3.900
3.875
3.850
3.825
3.800
3.775
3.750
3.725
3.700
V
BAT
(V)
0
I
BA
T
(mA)
3.0
900
800
700
600
500
400
300
200
100
0
0.5
4.5
1.0 1.5 2.0 2.5
3.5 4.0
NTC Fault Pulsing Frequency
vs V
CC
NTC Fault Pulsing Frequency
vs Temperature
Charge Current vs Ambient
Temperature with Thermal
Regulation
Charge Current vs Supply Voltage
Recharge Threshold Voltage vs
Temperature
Power FET "ON" Resistance vs
Temperature
TYPICAL PERFOR
U
W
CE CHARACTERISTICS
A
Internal Charge Timer vs
Temperature
Undervoltage Lockout Voltage vs
Temperature
Charge Current vs Battery Voltage
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