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LTC4040 PDF预览

LTC4040

更新时间： 2023-12-20 18:44:16
品牌 Logo 应用领域
亚德诺 - ADI 电池
页数 文件大小 规格书
26页 1366K
描述
2.5A 电池后备电源管理器

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中文翻译

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LTC4040 数据手册

 浏览型号LTC4040的Datasheet PDF文件第2页浏览型号LTC4040的Datasheet PDF文件第3页浏览型号LTC4040的Datasheet PDF文件第4页浏览型号LTC4040的Datasheet PDF文件第5页浏览型号LTC4040的Datasheet PDF文件第6页浏览型号LTC4040的Datasheet PDF文件第7页 
LTC4040  
2.5A Battery Backup  
Power Manager  
FeaTures  
DescripTion  
The LTC®4040 is a complete 3.5V to 5.5V supply rail bat-  
tery backup system. It contains a high current step-up  
DC/DC regulator to back up the supply from a single-cell  
n
Step-Up Backup Supply and Step-Down Battery  
Charger  
n
6.5A Switches for 2.5A Backup from 3.2V Battery  
n
Input Current Limit Prioritizes Load Over Charge  
Li-Ion or LiFePO battery. When external power is avail-  
4
Current  
able, the step-up regulator operates in reverse as a step-  
n
Input Disconnect Switch Isolates Input During Backup down battery charger.  
n
n
n
n
Automatic Seamless Switch-Over to Backup Mode  
The LTC4040’s adjustable input current limit function  
Input Power Loss Indicator  
System Power Loss Indicator  
reduces charge current to protect the main supply from  
overload while an external disconnect switch isolates the  
external supply during backup. When the input supply  
drops below the adjustable PFI threshold, the 2.5A boost  
regulator delivers power from the battery to the system  
output.  
Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V)  
or LiFePO (3.45V/3.5V/3.55V/3.6V)  
4
n
n
n
Optional OVP Circuitry Protects Device to >60V  
Constant Frequency Operation  
Low Profile (0.75mm) 24-Lead 4mm × 5mm QFN Package  
An optional input overvoltage protection (OVP) circuit  
protects the LTC4040 from high voltage damage at the  
applicaTions  
V
pin. One logic input selects either the Li-Ion or the  
IN  
LiFePO battery option, and two other logic inputs pro-  
4
n
Fleet and Asset Tracking  
gram the battery charge voltage to one of four levels suit-  
able for backup applications. The LTC4040 is available in a  
low profile (0.75mm) 24-Lead 4mm × 5mm QFN package.  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
and PowerPath is a trademark of Analog Devices, Inc. All other trademarks are the property  
of their respective owners. Protected by U.S. Patents, including 6522118, 6570372, 6700364,  
8139329.  
n
Automotive GPS Data Loggers  
n
Automotive Telematics Systems  
n
Toll Collection Systems  
n
Security Systems  
n
USB Powered Devices  
Typical applicaTion  
4.5V Backup Application with 4.22V PFI Threshold  
Normal to Backup Mode Transition Waveform  
(Charge Current Setting: 1A, Input Current Limit Setting: 2A)  
5
10  
V
SYS  
1A  
12mΩ  
4.5V  
SYSTEM  
LOAD  
100µF  
4.5V INPUT  
SUPPLY  
4
8
V
= 3.3V  
= 1A  
BAT  
2.2µF  
1500k  
I
SYS  
3
6
C
R
= 100µF  
SYS  
V
CLN  
IGATE  
V
V
IN  
IN  
SYS  
BSTFB  
RSTFB  
324k  
= 2k  
154k  
PROG  
OVSNS  
PFI  
2
4
2.2µH  
60.4k  
SW  
I
BAT  
1
2
10µF  
FAULT  
PFO  
BAT  
LTC4040  
V
IN  
RST  
0
0
CHRG  
CLPROG  
NTC  
–1  
–2  
CHGOFF BSTOFF  
F0 F1 F2 PROG  
–0.4  
0
0.4  
TIME (ms)  
0.8  
1.2  
+
LiFePO  
4
NTC  
3.6V  
2k  
4040 TA01b  
V
SYS  
4040 TA01a  
4040fb  
1
For more information www.linear.com/LTC4040  
1234567...26

中文翻译

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