LTC4061
Standalone Linear Li-Ion Battery
Charger with Thermistor Input
FEATURES
■
■
DESCRIPTIO
■
■
■
■
■
■
■
■
■
■
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
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 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
⎯
C
⎯
H
⎯
R
⎯
G 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 20µA and
the battery drain current to less than 2µA.
Other features include smart recharge, USB
⎯
C
⎯
/
⎯
5 cur-
rent programming input, undervoltage lockout and AC
Present logic.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
SmartStart is a trademark of Linear Technology Corporation.
*Protected by U.S. Patents including 6522118.
APPLICATIO S
■
■
■
Handheld Computers
Portable MP3 Players
Digital Cameras
TYPICAL APPLICATIO
V
IN
4.3V TO 8V
1µF
V
CC
Complete Charge Cycle (1100mAh Battery)
900
800
CHARGE CURRENT (mA)
700
600
500
400
300
200
100
0
4061 TA01a
800mA Single Cell Li-Ion Battery Charger
(C/10 Termination)
800mA
BAT
EN LTC4061
CHRG
C/5
TIMER
PROG
I
DET
619Ω
GND
ACPR
NTC
+
4.2V
SINGLE CELL
Li-Ion BATTERY
BATTERY
VOLTAGE
V
CC
= 5V
T
A
= 25°C
0
0.5
1.5
1.0
2.0
TIME (HOURS)
2.5
U
4.3
4.2
4.1
BATTERY VOLTAGE (V)
4.0
3.9
BATTERY
CURRENT
3.8
3.7
3.6
3.5
3.4
3.0
4061 TA01b
U
U
4061fa
1
LTC4061
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
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
⎯
E
⎯
N,
⎯
A
⎯
C
⎯
P
⎯
R,
⎯
C
⎯
H
⎯
R
⎯
G, 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
ORDER PART
NUMBER
LTC4061EDD
DD PART
MARKING
LBJS
T
JMAX
= 125°C,
θ
JA
= 40°C/W (NOTE 3)
EXPOSED PAD IS GROUND (PIN 11)
MUST BE SOLDERED TO PCB
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
4.3
TYP
240
130
20
MAX
8
500
300
50
4.215
4.225
107
840
±2
±2
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
Charge Mode (Note 4), R
PROG
= 10k
●
Standby Mode, Charge Terminated
●
⎯
E
⎯
N = 5V, V
CC
< V
BAT
or V
CC
< V
UV
)
●
Shutdown (
0 ≤ T
A
≤ 85°C
4.185
4.175
●
●
●
●
V
FLOAT
I
BAT
V
BAT
Regulated Output Voltage
BAT Pin Current
R
PROG
= 10k, Constant Current Mode
R
PROG
= 1.25k, Constant Current Mode
Standby Mode, Charge Terminated
Shutdown Mode
R
PROG
= 10k, Constant Current Mode
R
PROG
= 1.25k, Constant Current Mode
I
⎯
A
⎯
C
⎯
P
⎯
R
= 5mA
I
⎯
C
⎯
H
⎯
R
⎯
G
= 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
●
4.2
4.2
100
800
±1
±1
1
1
0.1
0.1
93
760
V
PROG
V
⎯
A
⎯
C
⎯
P
⎯
R
V
⎯
C
⎯
H
⎯
R
⎯
G
I
TRIKL
V
TRIKL
V
UV
V
ASD
R
⎯
E
⎯
N
V
⎯
E
⎯
N
V
CT
PROG Pin Voltage
⎯
A
⎯
C
⎯
P
⎯
R Output Low Voltage
⎯
C
⎯
H
⎯
R
⎯
G Output Low Voltage
Trickle Charge Current
Trickle Charge Threshold Voltage
V
CC
Undervoltage Lockout Voltage
V
CC
– V
BAT
Lockout Threshold Voltage
⎯
E
⎯
N Pin Pull-Down Resistor
⎯
E
⎯
N Input Threshold Voltage
Charge Termination Mode Threshold
Voltage
0.97
0.97
6
60
2.8
3.7
145
10
2
0.4
0.4
10
80
2.9
100
3.8
200
190
45
3.4
0.7
70
0.7
50
⎯
E
⎯
N Rising, 4.3V < V
CC
< 8V
Hysteresis
V
TIMER
from High to Low
Hysteresis
4061fa
2
U
W
U
U
W W
W
LTC4061
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
CHRG
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
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
⎯
C
⎯
H
⎯
R
⎯
G
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
mA
mA
mA
mA
mV
µs
ms
ms
hr
MΩ
V
mV
V
V
V
V
mV
mV
Hz
Hz
°C
mΩ
⎯
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
100
1
2
V
BAT
= 3.85V, I
CC
= 175mA, R
PROG
= 2k
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 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.
4061fa
3
LTC4061
TYPICAL PERFOR A CE 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
V
CC
= 5V
R
PROG
= 1k
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
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)
350
80
–25
0
25
50
TEMPERATURE (°C)
4
U W
1.0
4061 G04
Battery Regulated Output (Float)
Voltage vs Temperature
4.215
4.210
4.205
4.200
4.195
4.14
4.190
4.185
–50
4.12
V
CC
= 5V
R
PROG
= 10k
4.26
4.24
4.22
4.20
4.18
4.16
Battery Regulated Output (Float)
Voltage vs Supply Voltage
R
PROG
= 1k
T
A
= 25°C
I
BAT
= 10mA
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G02
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
PROG Pin Voltage vs Temperature
(Constant-Current Mode)
R
PROG
= 10k
C/5 = V
CC
1.006
1.004
1.002
V
CC
= 8V
1.000
V
CC
= 4.3V
0.998
0.996
0.994
–50
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
1.2
–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 Threshold Voltage
vs Temperature
V
CC
= 5V
R
PROG
= 1.25k
550
Charge Current vs Battery Voltage
C/5 = 5V
450
250
V
CC
= 5V
R
PROG
= 2k
150
C/5 = 0V
50
3.2
3.0
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
4061fa
LTC4061
TYPICAL PERFOR A CE CHARACTERISTICS
Internal Charge Timer vs
Temperature
195
190
t
TIMER
(MINUTES)
185
f
CHRG
(Hz)
V
CC
= 8V
180
175
170
165
–50
C
TIMER
= 0.1µF
–25
0
25
50
TEMPERATURE (°C)
75
100
4061 G10
V
CC
= 4.3V
1.45
1.40
1.35
1.30
4.0
f
CHRG
(Hz)
Charge Current vs Ambient
Temperature with Thermal
Regulation
1000
ONSET OF THERMAL
REGULATION
800
R
PROG
= 1.25k
I
BAT
(mA)
102
104
I
BAT
(mA)
600
V
RECHARGE
(V)
R
PROG
= 2k
400
200
0
–50
–25
50
25
0
75
TEMPERATURE (°C)
Power FET “ON” Resistance vs
Temperature
500
V
CC
= 4V
I
BAT
= 200mA
450
3.850
3.900
3.875
I
BAT
(mA)
V
UV
(V)
400
350
300
250
–50
–25
0
25
50
TEMPERATURE (°C)
U W
100
125
4061 G13
NTC Fault Pulsing Frequency
vs V
CC
1.60
C
TIMER
= 0.1µF
1.55
1.50
1.5
1.6
1.7
NTC Fault Pulsing Frequency
vs Temperature
C
TIMER
= 0.1µF
V
CC
= 8V
V
CC
= 4.3V
1.4
1.3
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
4061 G12
4061 G11
Charge Current vs Supply Voltage
V
CC
= 5V
V
BAT
= 4V
C/5 = 5V
R
PROG
= 10k
4.16
4.14
4.12
Recharge Threshold Voltage vs
Temperature
V
CC
= 8V
V
CC
= 4.3V
100
4.10
4.08
4.06
98
96
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 G14
Undervoltage Lockout Voltage vs
Temperature
900
800
700
600
3.825
3.800
3.775
3.750
3.725
500
400
300
200
100
0
–25
50
25
0
TEMPERATURE (°C)
75
100
4061 G17
Charge Current vs Battery Voltage
75
100
4061 G16
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)
4061 G18
4061fa
5
Buy&Sell
京公网安备 11010802033920号
EEWORLD
