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LTC1734LES6-4.2 Datasheet

  • LTC1734LES6-4.2

  • Lithium-Ion Linear Battery Charger in ThinSOT

  • 12頁

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LTC1734L
Lithium-Ion Linear
Battery Charger in ThinSOT
FEATURES
s
s
s
s
s
s
DESCRIPTIO
s
s
s
s
s
Low Profile (1mm) ThinSOT
TM
Package
Programmable Charge Current: 50mA to 180mA
No Blocking Diode Required
No Sense Resistor Required
1% Accurate Preset Voltage: 4.2V
Charge Current Monitor Output
for Charge Termination
Automatic Sleep Mode with Input Supply Removal
Manual Shutdown
Negligible Battery Drain Current in Shutdown
Undervoltage Lockout
Self Protection for Overcurrent/Overtemperature
The LTC
廬
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.
APPLICATIO S
s
s
s
s
s
s
Cellular Telephones
Handheld Computers
Digital Cameras
Charging Docks and Cradles
Low Cost and Small Size Chargers
Programmable Current Sources
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
TYPICAL APPLICATIO
PROG Pin Indicates Charge Status
5V
V
BAT
(V)
80mA Li-Ion Battery Charger
V
IN
5V
1碌F
3
2
4
R
PROG
4.7k
V
CC
I
SENSE
1
4V
LTC1734L
6
GND
DRIVE
PROG
BAT
5
3V
UMT4403
I
BAT
= 80mA
10碌F
V
PROG
(V)
2V
CONSTANT
CURRENT
V
PROG
+
SINGLE
Li-Ion
BATTERY
1734 TA01
1.5V
1V
0V
CHARGING
BEGINS
U
V
BAT
CONSTANT
VOLTAGE
CHARGING
COMPLETE
1734 TA01b
U
U
1734lf
1

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