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LTC1731ES8-8.4#TRPBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1731-8.2/LTC1731-8.4
sn1731 17318fs
FEATURES
APPLICATIO S
U
DESCRIPTIO
U
TYPICAL APPLICATIO
U
Lithium-Ion Linear
Battery Charger Controller
The LTC
®
1731-8.2/LTC1731-8.4 are complete constant-
current/constant-voltage linear charger controllers for 2-
cell lithium-ion (Li-Ion)batteries. Nickel-cadmium (NiCd)
and nickel-metal-hydride (NiMH) batteries can also be
charged with constant current using external termina-
tion. The external sense resistor sets the charge current
with 7% accuracy. An internal resistor divider and preci-
sion reference set the final float potential with 1% accu-
racy. The output float voltages are set internally to 8.2V
(LTC1731-8.2) or 8.4V (LTC1731-8.4).
When the input supply is removed, the LTC1731-8.2/
LTC1731-8.4 automatically enter a low current sleep mode,
dropping the battery drain current to typically 15µA. An
internal comparator detects the end-of-charge (C/10) con-
dition while a programmable timer, using an external
capacitor, sets the total charge time. Fully discharged cells
are automatically trickle charged at 10% of the pro-
grammed current until battery voltage exceeds 4.95V.
The LTC1731-8.2/LTC1731-8.4 are available in the 8-pin
MSOP and SO packages. For 1-cell Li-Ion battery charg-
ing, see the LTC1731-4.1 and LTC1731-4.2 data sheets.
■
Complete Linear Charger Controller for
2-Cell Lithium-Ion Batteries
■
1% Voltage Accuracy
■
Programmable Charge Current
■
C/10 Charge Current Detection Output
■
Programmable Charge Termination Timer
■
Space Saving 8-Pin MSOP Package
■
Automatic Sleep Mode When Input Supply
is Removed (15µA Battery Drain)
■
Automatic Trickle Charging of Low Voltage Cells
■
Programmable for Constant-Current-Only Mode
■
Cellular Phones
■
Handheld Computers
■
Charging Docks and Cradles
■
Programmable Current Source
, LTC and LT are registered trademarks of Linear Technology Corporation.
400mA Li-Ion Charger
V
CC
V
IN
= 9V
SENSE
DRV
2k
R
SENSE
0.2Ω
R
PROG
*
19.6k
2-CELL
Li-ION
LTC1731-8.4
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
BAT
CHRG
8
7
MBRM120T3
10µF
1731 TA01
1µF
I
BAT
= 400mA
C
TIMER
0.1µF
Q1
Si9430DY
6
1
5
4
2
3
TIMER
PROG
GND
+
CHARGE
STATUS
Typical Li-Ion Charge Cycle
TIME (HOURS)
0
CHARGE CURRENT (mA)
400
300
200
100
0
9
8
7
6
1.5 2.5
1731 TA01b
0.5 1.0
2.0 3.0
CONSTANT
VOLTAGE
CONSTANT
CURRENT
TIMER
STOPS
CHRG
LED OFF
BATTERY VOLTAGE
400mA HR BATTERY
CHARGE CURRENT
BATTERY VOLTAGE(V)
2
LTC1731-8.2/LTC1731-8.4
sn1731 17318fs
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Supply Voltage ● 8.8 12 V
I
CC
Input Supply Current Charger On, Current Mode ● 13 mA
Shutdown Mode
● 12 mA
Sleep Mode (Battery Drain Current) 15 30 µA
V
BAT
Regulated Output Voltage LTC1731-8.2 (9V ≤ V
CC
≤ 12V) ● 8.118 8.2 8.282 V
LTC1731-8.4 (9V ≤ V
CC
≤ 12V) ● 8.316 8.4 8.484 V
I
BAT
Current Mode Charge Current R
PROG
= 19.6k, R
SENSE
= 0.2Ω 465 500 535 mA
R
PROG
= 19.6k, R
SENSE
= 0.2Ω ● 415 500 585 mA
R
PROG
= 97.6k, R
SENSE
= 0.2Ω 70 100 130 mA
I
TRIKL
Trickle Charge Current V
BAT
= 4V, R
PROG
= 19.6k, I
TRIKL
= (V
CC
– V
SENSE
)/0.2Ω ● 30 50 100 mA
V
TRIKL
Trickle Charge Threshold Voltage BAT Rising ● 4.7 4.95 5.1 V
V
UV
V
CC
Undervoltage Lockout Voltage V
CC
Rising ● 8.2 8.8 V
∆V
UV
V
CC
Undervoltage Lockout Hysteresis V
CC
Falling 200 mV
V
MSD
Manual Shutdown Threshold Voltage PROG Pin Rising 2.457 V
PROG Pin Falling 2.446 V
I
DRV
Drive Pin Current V
DRV
= V
CC
– 2V 26 µA
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage (V
CC
) ................................... 13.2V
SENSE, DRV, BAT, TIMER, PROG ............ –0.3V to V
CC
CHRG..................................................... –0.3V to 13.2V
LTC1731EMS8-8.2
LTC1731EMS8-8.4
T
JMAX
= 150°C, θ
JA
= 200°C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ABSOLUTE MAXIMUM RATINGS
W
WW
U
PACKAGE/ORDER INFORMATION
W
U
U
Operating Temperature Range (Note 2) .....–40° to 85°C
Storage Temperature Range ................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
MS8 PART MARKING
LTSW
LTPE
1
2
3
4
BAT
CHRG
TIMER
GND
8
7
6
5
SENSE
V
CC
DRV
PROG
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
ORDER PART
NUMBER
LTC1731ES8-8.2
LTC1731ES8-8.4
S8 PART MARKING
173182
173184
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9V unless otherwise noted.
ELECTRICAL CHARACTERISTICS
1
2
3
4
8
7
6
5
TOP VIEW
SENSE
V
CC
DRV
PROG
BAT
CHRG
TIMER
GND
S8 PACKAGE
8-LEAD PLASTIC SO
T
JMAX
= 150°C, θ
JA
= 125°C/W
3
LTC1731-8.2/LTC1731-8.4
sn1731 17318fs
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
ASD
Automatic Shutdown Threshold Voltage (V
CC
– V
BAT
) Falling 30 54 90 mV
(V
CC
– V
BAT
) Rising 40 69 100 mV
V
DIS
Voltage Mode Disable Threshold Voltage V
DIS
=
(V
CC
– V
TIMER
) ● 0.4 V
I
PROG
PROG Pin Current Internal Pull-Up Current, No R
PROG
2.5 µA
PROG Pin Load Regulation PROG Pin Source Current, ∆V
PROG
≤ 5mV ● 300 µA
V
PROG
PROG Pin Voltage R
PROG
=19.6k 2.457 V
I
CHRG
CHRG Pin Weak Pull-Down Current V
CHRG
= 1V 50 100 150 µA
V
CHRG
CHRG Pin Output Low Voltage I
CHRG
= 5mA 0.6 1.2 V
I
C/10
End of Charge Indication Current Level R
PROG
= 19.6k, R
SENSE
= 0.2Ω ● 25 50 100 mA
t
TIMER
TIMER Accuracy C
TIMER
= 0.01µF10%
V
CLAMP
DRV Pin Clamp Voltage V
CLAMP
= V
CC
– V
DRV
, I
DRIVE
= 50µA 6.5 V
ELECTRICAL CHARACTERISTICS
Note 2: The LTC1731E-8.2/LTC1731E-8.4 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. Consult
factory for I grade parts.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 9V unless otherwise noted.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
V
CC
(V)
9
I
TRKL
(mA)
10 11 12
1731 G01
60
55
50
45
40
R
PROG
= 19.6K
R
SENSE
= 0.2Ω
V
BAT
= 4V
T
A
= 25°
Trickle Charge Current
vs V
CC
I
TRKL
(mA)
60
55
50
45
40
TEMPERATURE (°C)
–50 100
1731 G06
050–25 25 75 125
R
PROG
= 19.6K
R
SENSE
= 0.2Ω
V
BAT
= 4V
V
CC
= 9V
V
CC
(V)
9
V
TRKL
(V)
10 11 12
1731 G08
4.96
4.95
4.94
4.93
4.92
4.91
4.90
4.89
4.88
R
PROG
= 19.6K
T
A
= 25°
Trickle Charge Current
vs Temperature
Trickle Charge Threshold Voltage
vs V
CC
P1-P3P4-P6P7-P9P10-P12

LTC1731ES8-8.4#TRPBF

Mfr. #:
Buy LTC1731ES8-8.4#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management Lithium-Ion Lin Bat Chr Cntr
Lifecycle:
New from this manufacturer.
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