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參數資料
| 型號： | LT1239CS#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 235K |
| 代理商： | LT1239CS#TR |
1
LT1239
Backup Battery
Management Circuit
I
Micropower Operation (IQ = 20A)
I
Adjustable Regulator for Battery Charging
I
4.85V Regulator for Battery Regulation
I
Cell Voltage Equalization in 2-Cell Systems
I
Low-Battery Detector Protects Lithium Cells
I
Comparator for Automatic Power Switching
I
Shutdown
I
Output Current Sensing
I
Current and Thermal Limiting
I
Reverse Output Protection
I
16-Pin SO Package
I
Operates on 7V to 30V Input
The LT1239 is a micropower backup battery manage-
ment system for portable computers and instrumenta-
tion. It contains two regulators for regulating the battery
voltage and memory voltage and a comparator for switch-
ing between main power and backup power. The first
regulator provides a constant voltage charge for the
backup batteries and is adjustable from 3.75V up to 20V.
An equalization amplifier combined with the first regulator
provides precision charge equalization for a 2-cell
lithium-ion system. A second regulator with 4.85V output
providesaregulatedbackupbatteryvoltagetothememory
when main power is lost. The second regulator also
isolates the backup battery from the main 5V supply
during normal operation when the memory is being pow-
ered by the 5V supply.
A comparator is included which provides automatic
switchover from main 5V power to backup power ensur-
ing uninterrupted power for memory and power monitor-
FEATURES
DESCRIPTION
U
I
Backup Battery Management Systems for Portable
Computers
I
Lithium-Ion Backup Systems
I
NiCd Backup Systems
APPLICATIONS
U
TYPICAL APPLICATION
U
, LTC and LT are registered trademarks of Linear Technology Corporation.
Lithium-Ion Backup System
604k
1%
69.8k
1%
681k
1%
22
F
3.4V
Li-Ion
CELL
3.4V
Li-Ion
CELL
E/A (IN)
E/A (OUT)
5VIN
OUT 1
ADJ
IMON1
300pF
INPUT 2
120
* 120*
INPUT 2
OUT 2
IMON2
SHDN1
IN
MAIN
BATTERY
PACK
7V TO 24V
INPUT 1
22
F
INPUT 1
SHDN2
OUT
IN
GND
* REQUIRED BY SOME SAFETY AGENCIES
SEE APPLICATIONS INFORMATION
FOR INFORMATION ON
SELECTING VALUES.
LTC1239 TA01
–
+
–
+
5V SYSTEM
POWER
MEMORY
POWER
MANAGEMENT
LOW-BATTERY
DETECT
+
11
1
7
8
15
16
13
12
10
2
4
5
6
14
3
REGULATOR
#1
REGULATOR
#2
FOR INFORMATION PURPOSES ONLY
OBSOLETE:
Contact Linear Technology for Potential Replacement
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LT123A | 制造商:LINER 制造商全稱:Linear Technology 功能描述:5 Volt, 3 Amp Voltage Regulator |
| LT123AK | 制造商:LINER 制造商全稱:Linear Technology 功能描述:5 Volt, 3 Amp Voltage Regulator |
| LT123AK/883 | 制造商:Linear Technology 功能描述: |
| LT123K | 制造商:LINER 制造商全稱:Linear Technology 功能描述:5 Volt, 3 Amp Voltage Regulator |
| LT1240-7 | 制造商:Power-One 功能描述: |
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