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LT1621_15

更新时间： 2024-02-07 11:32:41
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
12页 253K
描述
Rail-to-Rail Current Sense Amplifier

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中文翻译

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LT1621_15 数据手册

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LT1620/LT1621  
Rail-to-Rail Current  
Sense Amplifier  
U
DESCRIPTIO  
EATURE  
S
F
The LT®1620 simplifies the design of high performance,  
controlled current battery charging circuits when used in  
conjunction with a current mode PWM controller IC.  
■
■
■
Accurate Output Current Programming  
Usable in Charging Applications Up to 32V Output  
Programmable Load Current Monitor for End-of-  
Charging-Cycle Notification (16-Pin Version)  
Dual Function IC (LT1621) Allows Convenient  
Integration of Load and Input Current Sensing  
Level-Shifted Current Sense Output for Current Mode  
PWM Controllers  
TheLT1620regulatesaverageoutputcurrentindependent  
of input and output voltage variations. Output current can  
be easily adjusted via a programming voltage applied to  
the LT1620’s PROG pin.  
■
■
■
■
■
Most current mode PWM controllers have limited output  
voltagerangebecauseofcommonmodelimitationsonthe  
current sense inputs. The LT1620 overcomes this restric-  
tion by providing a level-shifted current sense signal,  
allowing a 0V to 32V output voltage range.  
Can be Used for NiCd, NiMH, Lead-Acid and Lithium-  
Ion Battery Charging  
Greater than 96% Efficiency Possible in Charger  
Applications  
High Output Currents Possible: > 10A  
Easily Obtained  
The 16-pin version of the LT1620 contains a program-  
mable low charging current flag output. This output flag  
can be used to signal when a Li-Ion battery charging cycle  
is nearing completion.  
O U  
PPLICATI  
A
S
■
High Current Battery Chargers  
High Output Voltage DC/DC Converters  
Constant Current Sources  
■
The LT1621 incorporates two fully independent current  
control circuits for dual loop applications.  
■
■
Overcurrent Fault Protectors  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
O
TYPICAL APPLICATI  
(V  
+ 0.5V) TO 32V  
BATT  
V
IN  
V
IN  
+
22µF  
LTC1435  
Efficiency  
35V  
SYNCHRONOUS  
BUCK  
100  
95  
× 2  
V
= 24V  
IN  
I
TO 4A  
V
= 16V  
= 12V  
BATT  
BATT  
REGULATOR  
V
I
SW  
BATT  
TH  
0.025Ω  
–
1.43M  
0.1%  
27µH  
SENSE  
V
BATT  
+
INTV  
FB  
CC  
22µF  
35V  
90  
V
= 6V  
BATT  
0.1µF  
0.1µF  
110k  
0.1%  
6
3k  
1%  
85  
80  
75  
V
CC  
1
2
8
SENSE  
AVG  
7
5
I
PROG  
LT1620MS8  
OUT  
15.75k  
1%  
3
4
GND  
–
+
IN  
IN  
0
1
2
3
4
5
LT1620/21 • F01  
BATTERY CHARGE CURRENT (A)  
SIMPLIFIED SCHEMATIC. SEE FIGURE 2 FOR COMPLETE SCHEMATIC  
1620/21 • TA02  
Figure 1. Low Dropout, High Current Li-Ion Battery Charger  
1
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