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LTC1731EMS8-4.1#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1731-4.1/LTC1731-4.2
Single Cell Lithium-Ion Linear
Battery Charger Controllers
The LTC
®
1731 is a complete constant-current/constant-
voltage linear charger controller for single cell lithium-ion
batteries. Nickel-cadmium (NiCd) and nickel-metal-hy-
dride (NiMH) batteries can also be charged with constant
current using external termination. The external sense
resistor sets the charge current with 5% accuracy. An
internal resistor divider and precision reference set the
final float potential with ±1% accuracy. The output float
voltage is set internally to 4.1V (LTC1731-4.1) or 4.2V
(LTC1731-4.2).
When the input supply is removed, the LTC1731 automati-
cally enters a low current sleep mode, dropping the battery
drain current to typically 7µA. An internal comparator
detects the end-of-charge (C/10) condition while a pro-
grammable timer, using an external capacitor, sets the
total charge time. Fully discharged cells are automatically
trickle charged at 10% of the programmed current until
cell voltage exceeds 2.457V.
The LTC1731 is available in the 8-pin MSOP and SO
packages.
■
Complete Linear Charger Controller for
1-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 (7µA 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.
V
CC
V
IN
= 6V
SENSE
DRV
1k
R
SENSE
0.2Ω
R
PROG
*
19.6k
Li-ION
CELL
LTC1731-4.2
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
BAT
CHRG
8
7
MBRM120T3
10µF
1731 TA01
1µF
I
BAT
= 500mA
C
TIMER
0.1µF
CHARGE
STATUS
Q1
Si9430DY
6
1
5
4
+
2
3
TIMER
PROG
GND
500mA Li-Ion Battery Charger
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1731-4.1/LTC1731-4.2
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Input Supply Voltage ● 4.5 12 V
I
CC
Input Supply Current Charger On, Current Mode ● 13 mA
Shutdown Mode
● 12 mA
Sleep Mode (Battery Drain Current) 7 20 µA
V
BAT
Regulated Output Voltage LTC1731-4.1 (5V ≤ V
CC
≤ 12V) ● 4.059 4.1 4.141 V
LTC1731-4.2 (5V ≤ V
CC
≤ 12V) ● 4.158 4.2 4.242 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 ● 415 585 mA
R
PROG
= 97.6k, R
SENSE
= 0.2Ω 70 100 130 mA
I
TRIKL
Trickle Charge Current V
BAT
= 2V, R
PROG
= 19.6k, I
TRIKL
= (V
CC
– V
SENSE
)/0.2Ω ● 30 50 100 mA
V
TRIKL
Trickle Charge Threshold Voltage From Low to High ● 2.35 2.457 2.55 V
V
UV
V
CC
Undervoltage Lockout Voltage From Low to High ● 4.1 4.5 V
∆V
UV
V
CC
Undervoltage Lockout Hysteresis 200 mV
V
MSD
Manual Shutdown Threshold Voltage PROG Pin Low to High 2.457 V
PROG Pin High to Low 2.446 V
ORDER PART
NUMBER
(Note 1)
Input Supply Voltage (V
CC
) ................................... 13.2V
Input Voltage (SENSE, DRV, BAT,
TIMER, PROG) .................................. –0.3V to 13.2V
Output Voltage (CHRG) ......................... –0.3V to 13.2V
LTC1731EMS8-4.1
LTC1731EMS8-4.2
T
JMAX
= 150°C, θ
JA
= 200°C/W
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
LTJK
LTKQ
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
LTC1731ES8-4.1
LTC1731ES8-4.2
S8 PART MARKING
173141
173142
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 6V 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
Consult factory for parts specified with wider operating temperature ranges.
3
LTC1731-4.1/LTC1731-4.2
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
) High to Low 30 54 90 mV
(V
CC
– V
BAT
) Low to High 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
= 0.1µF10%
V
CLAMP
DRV Pin Clamp Voltage V
CLAMP
= V
CC
– V
DRV
, I
DRIVE
= 50µA 6.5 V
ELECTRICAL CHARACTERISTICS
Note 2: The LTC1731E 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. Guaranteed I grade parts are available,
consult factory.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 6V unless otherwise noted.
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Trickle Charge Current
vs Input Supply
V
CC
(V)
4
I
TRKL
(mA)
50
55
12
1731 G01
45
40
6
8
10
60
R
PROG
= 19.6k
R
SENSE
= 0.2Ω
V
BAT
= 2V
T
A
= 25°C
TEMPERATURE (°C)
–50 –25 25
V
PROG
(V)
2.460
2.465
150
1731 G02
2.455
2.450
0
50 75
100 125
2.470
V
CC
= 6V
R
PROG
= 19.6k
TEMPERATURE (°C)
–50 –25 25
t
TIMER
(%)
100
105
150
1731 G03
95
90
0
50 75
100 125
110
V
CC
= 6V
C
TIMER
= 0.1µF
Program Pin Voltage
vs Temperature
Timer Accuracy vs Temperature
P1-P3P4-P6P7-P9P10-P12

LTC1731EMS8-4.1#PBF

Mfr. #:
Buy LTC1731EMS8-4.1#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Battery Management 1x Cell Lithium-Ion Lin Bat Chr Cntrs
Lifecycle:
New from this manufacturer.
Delivery:
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