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LT3433_1

更新时间： 2024-11-23 05:43:31
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
16页 234K
描述
High Voltage Step-Up/Step-Down DC/DC Converter

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中文翻译

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LT3433_1 数据手册

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LT3433  
High Voltage  
Step-Up/Step-Down  
DC/DC Converter  
U
FEATURES  
DESCRIPTIO  
The LT®3433 is a 200kHz fixed-frequency current mode  
switching regulator that provides both step-up and step-  
down regulation using a single inductor. The IC operates  
over a 4V to 60V input voltage range making it suitable for  
use in various wide input voltage range applications such  
as automotive electronics that must withstand both load  
dump and cold crank conditions.  
■
Automatic Step-Up and Step-Down Conversion  
■
Uses a Single Inductor  
■
Wide 4V to 60V Input Voltage Range  
■
VOUT from 3.3V to 20V  
■
Dual Internal 500mA Switches  
■
100µA No-Load Quiescent Current  
■
Low Current Shutdown  
■
±1% Output Voltage Accuracy  
Internal control circuitry monitors system conditions and  
converts from single switch buck operation to dual switch  
bridged operation when required, seamlessly changing  
between step-down and step-up voltage conversion.  
Optional Burst Mode® operation reduces no-load quies-  
cent current to 100µA and maintains high efficiencies with  
light loads.  
■
200kHz Operating Frequency  
■
Boosted Supply Pin to Saturate High Side Switch  
■
Frequency Foldback Protection  
Current Limit Foldback Protection  
■
■
Current Limit Unaffected by Duty Cycle  
16-lead Thermally Enhanced TSSOP Package  
■
U
APPLICATIO S  
Current limit foldback and frequency foldback help pre-  
vent inductor current runaway during start-up. Program-  
mablesoft-starthelpspreventoutputovershootatstart-up.  
■
12V Automotive Systems  
■
Wall Adapter Powered Systems  
■
Battery Power Voltage Buffering  
The LT3433 is available in a 16-lead thermally enhanced  
TSSOP package.  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation.  
U.S. patent number: 5731694  
U
TYPICAL APPLICATIO  
Maximum Output  
Current vs VIN  
4V to 60V to 5V DC/DC Converter  
with Burst Mode Operation  
Efficiency  
1N4148  
90  
80  
70  
60  
50  
40  
30  
20  
500  
400  
300  
200  
V
= 5V  
OUT  
V
V
IN  
V
BST  
IN  
2.2µF  
0.01µF  
0.1µF  
BUCK  
V = 13.8V  
IN  
SHDN  
SWH  
LT3433  
B160A  
SS  
100µH  
330pF  
1nF  
B120A  
V
C
V
SWL  
OUT  
V
IN  
= 4V  
+
68k  
V
OUT  
47µF  
1N4148  
BRIDGED  
V
BIAS  
0.1µF  
309k  
100k  
100  
0
BURST_EN  
V
FB  
SGND PGND  
0.1  
1
10  
100  
1000  
0
20  
30  
(V)  
40  
50  
60  
10  
OUTPUT CURRENT (mA)  
V
IN  
3433 TA01  
3433 TA01b  
3433 TA01c  
3433f  
1
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