LTC1730-4.2#TR [Linear]
IC 1 A BATTERY CHARGE CONTROLLER, PDSO8, SO-8, Switching Regulator or Controller;
| 型号： | LTC1730-4.2#TR |
| 厂家： | 
Linear |
| 描述： | IC 1 A BATTERY CHARGE CONTROLLER, PDSO8, SO-8, Switching Regulator or Controller 光电二极管 |
| 文件： | 总1页 (文件大小：70K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Final Electrical Specifications
LTC1730-4/LTC1730-4.2
Lithium-Ion Battery
Pulse Charger
December 2000
U
DESCRIPTIO
FEATURES
The LTC®1730 is a complete pulse charger for 1-cell
lithium-ion batteries. In the fast charge mode, the internal
power FET turns on causing the input voltage to collapse
as the wall adapter goes into current limit, thus forcing the
powertobedissipatedinthewalladapterandnotintheIC.
■
Complete Pulse Charger for 1-Cell Lithium-Ion
Batteries
■
1% Float Voltage Accuracy
■
End-of-Charge (C/10) Detection Output
Programmable Charge Termination Timer
Internal 0.35Ω NMOS Switch
No Blocking Diode Required
Sense Resistor Limits Maximum Current for Safety
SEL Pin to Set Either 4.1V or 4.2V Per Cell
■
■
As the battery becomes charged and approaches the
programmed voltage, the internal FET begins to pulse on
and off until the programmable timer expires. 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 drain current to less than 1µA (maximum).
■
■
■
(LTC1730-4)
■
Low-Battery Drain when Input Supply Is Removed
■
Battery Temperature Sensing and Charge
Qualification
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 FET prevents reverse battery current from flowing
if the input voltage is shorted to ground, eliminating the
need for a blocking diode.
■
Automatic Trickle Charging for Low-Battery Cell
■
Automatic Battery Refresh
U
APPLICATIO S
■
Complete Lithium-Ion Battery Charger
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.
■
Personal Information Appliances
■
Cellular Telephones
U
TYPICAL APPLICATIO
Single Cell 4.2V Li-Ion Battery Charger
V
= 4.5V TO 13.2V
IN
WITH 1A CURRENT LIMIT
2
R2
10k
4.7Ω
V
CC
R3
4.1k
R1
1k
R
SENSE
C1
1µF
C3
0.047µF
0.05Ω
LTC1730ES8-4.2
D3
7
GATE
CHARGE STATUS
3
6
0.022µF
CHRG
NTC
1
8
SENSE
R4
BAT
10k
1-CELL
Li-Ion
BATTERY
NTC*
TIMER
5
GND
4
C
TIMER
0.1µF
1730 TA01
*NTC: DALE NTHS-1206N02
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.
1
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