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LT3437

更新时间： 2024-11-27 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
28页 559K
描述
具有 100μA 静态电流的高电压、500mA、200kHz 降压型开关稳压器

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中文翻译

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LT3437 数据手册

 浏览型号LT3437的Datasheet PDF文件第2页浏览型号LT3437的Datasheet PDF文件第3页浏览型号LT3437的Datasheet PDF文件第4页浏览型号LT3437的Datasheet PDF文件第5页浏览型号LT3437的Datasheet PDF文件第6页浏览型号LT3437的Datasheet PDF文件第7页 
LT3437  
High Voltage 500mA, 200kHz  
Step-Down Switching Regulator  
with 100µA Quiescent Current  
U
FEATURES  
DESCRIPTIO  
The LT®3437 is a 200kHz monolithic buck switching  
regulator that accepts input voltages up to 80V. A high  
efficiency500mA,0.8Ωswitchisincludedonthediealong  
with all the necessary oscillator, control and logic cir-  
cuitry. Current mode topology is used for fast transient  
response and good loop stability.  
■
Wide Input Range: 3.3V to 60V  
■
Load Dump (Input Transient) Protection to 80V  
■
500mA Peak Switch Current  
Burst Mode® Operation: 100µA Quiescent Current**  
Low Shutdown Current: IQ < 1µA  
Defeatable Burst Mode Operation  
200kHz Switching Frequency  
■
■
■
■
■
■
Innovative design techniques along with a new high volt-  
age process achieve high efficiency over a wide input  
range. Efficiency is maintained over a wide output current  
rangebyemployingBurstModeoperationatlowcurrents,  
utilizing the output to bias the internal circuitry, and by  
using a supply boost capacitor to fully saturate the power  
switch. Burst Mode operation can be defeated by a logic  
high signal on the SYNC pin which results in lower light  
load ripple at the expense of light load efficiency. Patented  
circuitry maintains peak switch current over the full duty  
cycle range.* Shutdown reduces input supply current to  
less than 1µA. External synchronization can be imple-  
mented by driving the SYNC pin with logic-level inputs. A  
single capacitor from the CSS pin to the output provides a  
controlled output voltage ramp (soft-start).  
Saturating Switch Design: 0.8Ω On-Resistance  
Peak Switch Current Maintained Over  
Full Duty Cycle Range*  
■
■
■
■
1.25V Feedback Reference Voltage  
Easily Synchronizable  
Soft-Start Capability  
Small 10-Pin Thermally Enhanced DFN Package  
U
APPLICATIO S  
■
High Voltage Power Conversion  
■
14V and 42V Automotive Systems  
■
Industrial Power Systems  
■
Distributed Power Systems  
■
Battery-Powered Systems  
■
Powered Ethernet  
The LT3437 is available in a low profile (0.75mm) 3mm ×  
3mm 10-pin DFN package or a 16-Pin TSSOP Package,  
both with exposed pad leadframes for low thermal  
resistance.  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Burst Mode  
is a registered trademark of Linear Technology Corporation. All other trademarks are the  
property of their respective owners. *Protected by U.S. Patents, including 6498466.  
**See Burst Mode Operation section for conditions.  
U
TYPICAL APPLICATIO  
Input Voltage  
Transient Response  
14V to 3.3V Step-Down Converter with  
100µA No Load Quiescent Current  
Supply Current vs Input Voltage  
200  
180  
160  
140  
120  
100  
80  
V
OUT  
V
IN  
3.3V  
V
BOOST  
SW  
IN  
4.5V TO 80V*  
V
2.2µF  
100V  
CER  
100µH  
400mA  
IN  
0.1µF  
BAS21  
SHDN  
20V/DIV  
LT3437  
0.1µF  
10MQ100N  
V
C
SS  
C
V
0V  
IN  
330pF  
1500pF  
25k  
V
BIAS  
FB  
V
165k  
100k  
27pF  
OUT  
100µF  
6.3V  
TANT  
60  
20mV/DIV  
SYNC  
GND  
AC COUPLED  
40  
3437 TA03  
I
250mA  
OUT  
50ms/DIV  
COLD CRANK  
20  
LOAD DUMP  
0
3437 TA01  
*FOR INPUT VOLTAGES ABOVE 60V RESTRICTIONS APPLY  
0
10 20 30 40 50 60 70 80  
INPUT VOLTAGE (V)  
3437 TA02  
3437fc  
1
1234567...28

中文翻译

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