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LTC1730-4.2 Datasheet

  • LTC1730-4.2

  • Lithium-Ion Battery Pulse Charger with Overcurrent Protectio...

  • 12頁

  • LINER

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LTC1730-4/LTC1730-4.2
Lithium-Ion Battery
Pulse Charger with
Overcurrent Protection
FEATURES
s
s
s
s
s
s
s
s
s
DESCRIPTIO
s
s
s
Complete Pulse Charger for 1-Cell Lithium-Ion
Batteries
Sense Resistor Limits Maximum Current for Safety
1% Float Voltage Accuracy
End-of-Charge (C/10) Detection Output
Programmable Charge Termination Timer
Internal 0.35鈩?NMOS Switch
No Blocking Diode Required
SEL Pin to Set Either 4.1V or 4.2V/Cell (LTC1730-4)
Low-Battery Drain (1碌A(chǔ) Max) when Input Supply Is
Removed
Battery Temperature Sensing and Charge
Qualification
Automatic Trickle Charge for Low-Battery
Automatic Battery Refresh
The LTC
廬
1730 is a complete pulse charger for 1-cell
lithium-ion batteries. When charging a depleted cell, the
internal MOSFET is fully on allowing the current limited
input power source to provide charge current to the
battery, virtually eliminating heat generation in the charger.
As the battery accepts charge and approaches the pro-
grammed voltage, the internal MOSFET begins switching
off and on with the duty cycle gradually decreasing as the
battery approaches a fully charged condition. A program-
mable timer ends the charge cycle. The end-of-charge
condition is indicated at the CHRG pin when the average
charge current falls to
C/10.
Removing the input voltage
puts the LTC1730 into a sleep mode, dropping the battery
current drain to less than 1碌A(chǔ) (maximum).
An external sense resistor limits the maximum charge
current as a safety precaution against a user connecting a
wall adapter with the incorrect or no current limit. The
internal MOSFET prevents reverse battery current from
flowing if the input voltage is shorted to ground, eliminat-
ing the need for a blocking diode.
The LTC1730-4 is available in the 16-pin SSOP package
and the LTC1730-4.2 is available in the 8-pin SO package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Standalone Lithium-Ion Battery Charger
Handheld Computers
Cellular Telephones
TYPICAL APPLICATIO
1A, Single Cell 4.2V Li-Ion Battery Charger (8-Pin Package)
V
IN
= 4.5V TO 12V
WITH 1A CURRENT LIMIT
R1
1k
R3
4.1k
CHARGE STATUS
3
CHRG
SENSE
6
T
R4
10k
NTC*
C
TIMER
0.1碌F
*NTC: DALE NTHS-1206N02
1730 TA01
2
V
IN
LTC1730ES8-4.2
GATE
7
R2
10k
C3
0.047碌F
R
SENSE
0.05鈩?/div>
D3
0.022碌F
1
8
1-CELL
Li-Ion
BATTERY
NTC/SHDN
BAT
TIMER
5
GND
4
U
4.7鈩?/div>
C1
1碌F
U
U
1730f
1

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