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Linear Technology Electronic Components Datasheet

LTC1732-4 Datasheet

Lithium-Ion Linear Battery Charger Controller

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LTC1732-4 pdf
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LTC1732-4/LTC1732-4.2
Lithium-Ion Linear
Battery Charger Controller
FEATURES
s Complete Linear Charger Controller for 1-Cell
Lithium-Ion Batteries
s Preset Charge Voltage with 1% Accuracy
s Programmable Charge Current
s C/10 Charge Current Detection Output
s Programmable Charge Termination Timer
s Small, Thin 10-Pin MSOP Package
s Select Pin Charges 4.1V or 4.2V Cells (LTC1732-4)
s Input Supply (Wall Adapter) Detection Output
s 4.5V to 12V Input Voltage Range
s Automatic Sleep Mode When Input Supply
is Removed (Only 7µA Battery Drain)
s Automatic Trickle Charge of Low Voltage Cells
s Programmable for Constant-Current-Only Mode
s Battery Insertion Detect
s 4.05V Recharge Threshold for 4.2V Cells
(LTC1732-4.2)
s 3.8V Recharge Threshold for 4.1V or 4.2V Cells
(LTC1732-4)
U
APPLICATIO S
s Cellular Phones
s Handheld Computers
s Charging Docks and Cradles
DESCRIPTIO
The LTC®1732 is a complete constant-current/constant-
voltage linear charger controller for lithium-ion
(Li-Ion) batteries. Nickel-cadmium (NiCd) and nickel metal-
hydride (NiMH) batteries can also be charged with con-
stant current using external termination. Charge current
can be programmed with 7% (max) accuracy using exter-
nal sense and program resistors. An internal resistor
divider and precision reference set the final float voltage
with 1% accuracy. The SEL pin allows users to charge
either 4.1V or 4.2V cells.
When the input supply is removed, the LTC1732 automati-
cally enters a low current sleep mode, dropping the battery
drain current to 7µA. An internal comparator detects the
end-of-charge (C/10) condition while a programmable
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 LTC1732 begins a new charge cycle when a discharged
battery is connected to the charger or when the input power
is applied. In addition, if the battery remains connected to
the charger and the cell voltage drops below 3.8V for the
LTC1732-4 or below 4.05V for the LTC1732-4.2, a new
charge cycle will automatically begin.
The LTC1732 is available in the 10-pin MSOP package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
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Single Cell 4.2V Li-Ion Battery Charger
VIN = 6V
MBRM120T3
R1
1k
CTIMER
0.1µF
R2 8
1k VCC
3
CHRG
2
SEL
SENSE
DRV
9
7
LTC1732-4
10
ACPR
1
BAT
46
TIMER PROG
GND
5
RPROG*
19.6k
RSENSE
0.2
1µF
Q1
Si9430DY
IBAT = 500mA
10µF
+ 4.2V
Li-Ion
CELL
*SHUTDOWN INVOKED BY FLOATING THE PROG PIN
1732 TA01
1


Linear Technology Electronic Components Datasheet

LTC1732-4 Datasheet

Lithium-Ion Linear Battery Charger Controller

No Preview Available !

LTC1732-4 pdf
www.DataSheet4U.com
LTC1732-4/LTC1732-4.2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VCC) ................................... 13.2V
SENSE, DRV, BAT, SEL, TIMER, PROG,
CHRG, ACPR ......................................... – 0.3V to 13.2V
Operating Temperature Range (Note 2) .... – 40° to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
BAT 1
SEL 2
CHRG 3
TIMER 4
GND 5
TOP VIEW
10 ACPR
9 SENSE
8 VCC
7 DRV
6 PROG
MS10 PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 140°C, θJA = 180°C/W
ORDER PART
NUMBER
LTC1732EMS-4
LTC1732EMS-4.2
MS10 PART MARKING
LTNJ
LTUA
Consult factory for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 6V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Input Supply Voltage
ICC Input Supply Current
Charger On, Current Mode
Shutdown Mode
Sleep Mode (Battery Drain Current)
q 4.5
12
q 13
q 13
7 20
V
mA
mA
µA
VBAT Regulated Output Voltage
IBAT Current Mode Charge Current
ITRIKL
VTRIKL
VUV
VUV
VMSD
Trickle Charge Current
Trickle Charge Threshold Voltage
VCC Undervoltage Lockout Voltage
VCC Undervoltage Lockout Hysteresis
Manual Shutdown Threshold Voltage
LTC1732-4; 5V VCC 12V, VSEL = GND
LTC1732-4/LTC1732-4.2; 5V VCC 12V, VSEL = VCC
RPROG = 19.6k, RSENSE = 0.2
RPROG = 19.6k, RSENSE = 0.2
RPROG = 97.6k, RSENSE = 0.2
VBAT = 2V, RPROG = 19.6k, ITRIKL = (VCC – VSENSE)/0.2
From Low to High
q
q
q
q
q
From Low to High
q
PROG Pin Low to High
PROG Pin High to Low
4.059
4.158
465
415
60
30
2.35
4.1
4.2
500
100
50
2.457
4.1
200
2.457
2.446
4.141
4.242
535
585
140
110
2.55
4.5
V
V
mA
mA
mA
mA
V
V
mV
V
V
VASD
VDIS
IPROG
VPROG
VACPR
ICHRG
VCHRG
VSEL
Automatic Shutdown Threshold Voltage
Voltage Mode Disable Threshold Voltage
PROG Pin Current
PROG Pin Voltage
ACPR Pin Output Low Voltage
CHRG Pin Weak Pull-Down Current
CHRG Pin Output Low Voltage
SEL Pin Threshold
(VCC – VBAT) High to Low
(VCC – VBAT) Low to High
VDIS = VCC – VTIMER
Internal Pull-Up Current, No RPROG
PROG Pin Source Current, VPROG 5mV
RPROG =19.6k
IACPR = 5mA
VCHRG = 1V
ICHRG = 5mA
30 54 90
40 69 100
0.4
q 300
2.5
2.457
0.7 1.2
15 35 55
0.6 1.2
q 0.3
2
mV
mV
V
µA
µA
V
V
µA
V
V
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2


Part Number LTC1732-4
Description Lithium-Ion Linear Battery Charger Controller
Maker Linear Technology
Total Page 12 Pages
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LTC1732-4 pdf
LTC1732-4 Datasheet PDF
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