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LT3437IFE

更新时间： 2024-11-22 22:13:39
品牌 Logo 应用领域
凌特 - Linear 稳压器开关高压
页数 文件大小 规格书
24页 524K
描述
High Voltage 500mA, 200kHz Step-Down Switching Regulator with 100?A Quiescent Current

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中文翻译

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LT3437IFE 数据手册

 浏览型号LT3437IFE的Datasheet PDF文件第2页浏览型号LT3437IFE的Datasheet PDF文件第3页浏览型号LT3437IFE的Datasheet PDF文件第4页浏览型号LT3437IFE的Datasheet PDF文件第5页浏览型号LT3437IFE的Datasheet PDF文件第6页浏览型号LT3437IFE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  
Burst Mode Operation Defeat  
■
■
■
■
■
■
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  
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.  
■
Powered Ethernet  
, LTC and LT 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  
Supply Current vs Input Voltage  
200  
Transient Response  
14V to 3.3V Step-Down Converter with  
100µA No Load Quiescent Current  
180  
V
OUT  
V
IN  
3.3V  
V
BOOST  
IN  
160  
140  
120  
100  
80  
4.5V TO 80V*  
V
IN  
2.2µF  
100V  
CER  
100µH  
400mA  
0.1µF  
BAS21  
20V/DIV  
SHDN  
SW  
LT3437  
0.1µF  
10MQ100N  
V
C
C
SS  
V
IN  
0V  
330pF  
1500pF  
25k  
V
BIAS  
FB  
V
165k  
100k  
OUT  
27pF  
100µF  
6.3V  
TANT  
20mV/DIV  
60  
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)  
3435 TA02  
3437f  
1
1234567...24

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