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Linear Technology Electronic Components Datasheet

LTC1734L Datasheet

Lithium-Ion Linear Battery Charger in ThinSOT

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LTC1734L pdf
FEATURES
s Low Profile (1mm) ThinSOTTM Package
s Programmable Charge Current: 50mA to 180mA
s No Blocking Diode Required
s No Sense Resistor Required
s 1% Accurate Preset Voltage: 4.2V
s Charge Current Monitor Output
for Charge Termination
s Automatic Sleep Mode with Input Supply Removal
s Manual Shutdown
s Negligible Battery Drain Current in Shutdown
s Undervoltage Lockout
s Self Protection for Overcurrent/Overtemperature
U
APPLICATIO S
s Cellular Telephones
s Handheld Computers
s Digital Cameras
s Charging Docks and Cradles
s Low Cost and Small Size Chargers
s Programmable Current Sources
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
80mA Li-Ion Battery Charger
VIN
5V
1µF
3
VCC
1
ISENSE
2 LTC1734L 6
GND DRIVE
4
PROG
RPROG
4.7k
5
BAT
UMT4403
IBAT = 80mA
+
10µF
SINGLE
Li-Ion
BATTERY
1734 TA01
LTC1734L
Lithium-Ion Linear
Battery Charger in ThinSOT
DESCRIPTIO
The LTC®1734L is a low cost, single cell, constant-current/
constant-voltage Li-Ion battery charger controller. When
combined with a few external components, the SOT-23
package forms a very small, low cost charger for single cell
lithium-ion batteries. The LTC1734L is a lower charge
current version of the LTC1734.
The LTC1734L provides a fixed float voltage of 4.2V with
1% accuracy (for 4.1V and 4.15V float voltages, contact
LTC Marketing). Constant current is programmed using a
single external resistor between the PROG pin and ground.
Manual shutdown is accomplished by floating the pro-
gram resistor while removing input power automatically
puts the LTC1734L into a sleep mode. Both the shutdown
and sleep modes drain near zero current from the battery.
Charge current can be monitored via the voltage on the
PROG pin allowing a microcontroller or ADC to read the
current and determine when to terminate the charge cycle.
The output driver is both current limited and thermally
protected to prevent the LTC1734L from operating outside
of safe limits. No external blocking diode is required.
The LTC1734L can also function as a general purpose
current source or as a current source for charging nickel-
cadmium (NiCd) and nickel-metal-hydride (NiMH) batter-
ies using external termination.
PROG Pin Indicates Charge Status
5V
VBAT
4V
3V
CONSTANT
2V CURRENT
CONSTANT
VOLTAGE
1.5V VPROG
1V
0V
CHARGING
BEGINS
CHARGING
COMPLETE
1734 TA01b
1734lf
1


Linear Technology Electronic Components Datasheet

LTC1734L Datasheet

Lithium-Ion Linear Battery Charger in ThinSOT

No Preview Available !

LTC1734L pdf
LTC1734L
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VCC) ..........................– 0.3V to 9V
Input Voltage (BAT, PROG) ........ – 0.3V to (VCC + 0.3V)
Output Voltage (DRIVE) .............. – 0.3V to (VCC + 0.3V)
Output Current (ISENSE) ................................... – 210mA
Short-Circuit Duration (DRIVE) ...................... Indefinite
Junction Temperature .......................................... 125°C
Operating Ambient Temperature Range
(Note 2) ...............................................–40°C to 85°C
Operating Junction Temperature (Note 2) ............ 100°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
TOP VIEW
ISENSE 1
GND 2
VCC 3
6 DRIVE
5 BAT
4 PROG
S6 PACKAGE
6-LEAD PLASTIC SOT-23
TJMAX = 125°C, θJA = 230°C/W
ORDER PART
NUMBER
LTC1734LES6-4.2
S6 PART MARKING
LTE6
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, unless otherwise noted specifications are at TA = 25°C. VCC = 5V, GND = 0V and VBAT is equal to the float voltage
unless otherwise noted. All current into a pin is positive and current out of a pin is negative. All voltages are referenced to GND,
unless otherwise specified.
SYMBOL PARAMETER
VCC Supply
VCC Input Supply Voltage (Note 5)
ICC Quiescent VCC Pin Supply Current
ISHDN
IBMS
VCC Pin Supply Current in Manual Shutdown
Battery Drain Current in Manual Shutdown
(Note 3)
IBSL Battery Drain Current in Sleep Mode (Note 4)
VUVLOI Undervoltage Lockout Exit Threshold
VUVLOD Undervoltage Lockout Entry Threshold
VUVHYS Undervoltage Lockout Hysteresis
Charging Performance
VBAT Output Float Voltage in Constant Voltage Mode
IBAT1 Output Full-Scale Current When Programmed
for 50mA in Constant Current Mode
IBAT2 Output Full-Scale Current When Programmed
for 180mA in Constant Current Mode
VCM1
Current Monitor Voltage on PROG Pin
VCM2
Current Monitor Voltage on PROG Pin
IDSINK Drive Output Current
CONDITIONS
VBAT = 5V, (Forces IDRIVE = IBAT = 0),
IPROG = 200µA,(7500from PROG to GND)
PROG Pin Open
PROG Pin Open
VCC = 0V
VCC Increasing
VCC Decreasing
VCC Decreasing
IBAT = 10mA, 4.55V VCC 8V
RPROG = 7500, 4.55V VCC 8V,
Pass PNP Beta > 50
RPROG = 2100, 4.55V VCC 8V,
Pass PNP Beta > 50
IBAT = 10% of IBAT1, RPROG = 7500,
4.55V VCC 8V, Pass PNP Beta > 50,
0°C TA 85°C
IBAT = 10% of IBAT2, RPROG = 2100,
4.55V VCC 8V, Pass PNP Beta > 50,
0°C TA 85°C
VDRIVE = 3.5V
MIN TYP MAX UNITS
q 4.55
8
q 670 1150
q 450 900
q –1
0
1
q –1
0
1
q 4.45 4.56 4.68
q 4.30 4.41 4.53
150
V
µA
µA
µA
µA
V
V
mV
q 4.158 4.20 4.242
q 39 50 60
q 160 180 200
0.045 0.15 0.28
V
mA
mA
V
0.10 0.15 0.20
V
q 20
mA
1734lf
2


Part Number LTC1734L
Description Lithium-Ion Linear Battery Charger in ThinSOT
Maker Linear Technology
Total Page 12 Pages
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