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LT3435

更新时间： 2024-11-23 05:43:31
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 311K
描述
High Voltage 3A, 500kHz Step-Down Switching Regulator with 100® Quiescent Current

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中文翻译

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LT3435 数据手册

 浏览型号LT3435的Datasheet PDF文件第2页浏览型号LT3435的Datasheet PDF文件第3页浏览型号LT3435的Datasheet PDF文件第4页浏览型号LT3435的Datasheet PDF文件第5页浏览型号LT3435的Datasheet PDF文件第6页浏览型号LT3435的Datasheet PDF文件第7页 
LT3435  
High Voltage 3A, 500kHz  
Step-Down Switching Regulator  
with 100µA Quiescent Current  
U
FEATURES  
DESCRIPTIO  
The LT®3435 is a 500kHz monolithic buck switching  
regulator that accepts input voltages up to 60V. A high  
efficiency3A,0.1Ωswitchisincludedonthediealongwith  
all the necessary oscillator, control and logic circuitry.  
Current mode topology is used for fast transient response  
and good loop stability.  
■
Wide Input Range: 3.3V to 60V  
3A Peak Switch Current  
■
Burst Mode® Operation: 100µA Quiescent Current**  
Low Shutdown Current: IQ < 1µA  
Power Good Flag with Programmable Threshold  
Load Dump Protection to 60V  
500kHz 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. Patented circuitry maintains peak switch current  
over the full duty cycle range.* Shutdown reduces input  
supply current to less than 1µA. External synchronization  
canbeimplementedbydrivingtheSYNCpinwithlogic-level  
inputs. A single capacitor from the CSS pin to the output  
providesacontrolledoutputvoltageramp(soft-start).The  
device also has a power good flag with a programmable  
threshold and time-out and thermal shutdown protection.  
Saturating Switch Design: 0.1Ω On-Resistance  
Peak Switch Current Maintained Over  
Full Duty Cycle Range*  
1.25V Feedback Reference Voltage  
Easily Synchronizable  
Soft-Start Capability  
Small 16-Pin Thermally Enhanced TSSOP Package  
U
■
■
■
■
APPLICATIO S  
■
High Voltage Power Conversion  
■
14V and 42V Automotive Systems  
■
Industrial Power Systems  
■
Distributed Power Systems  
■
Battery-Powered Systems  
TheLT3435isavailableina16-pinTSSOPpackagewithan  
exposed pad leadframe for low thermal resistance.  
■
USB Powered Systems  
, 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  
Efficiency and Power Loss  
Supply Current vs Input Voltage  
vs Load Current  
14V to 3.3V Step-Down Converter with  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10  
150  
100µA No Load Quiescent Current  
V
IN  
= 12V  
V
= 3.3V  
= 25°C  
OUT  
A
T
V
3.3V  
2A  
OUT  
125  
100  
75  
50  
25  
0
V
V
BOOST  
IN  
IN  
V
OUT  
= 5V  
1
4.7µF  
100V  
CER  
15µH  
0.33µF  
4148  
SHDN  
SW  
EFFICIENCY  
= 3.3V  
LT3435  
0.1µF  
B360A  
V
C
C
SS  
C
V
OUT  
0.1  
0.01  
0.001  
TYPICAL  
470pF  
4700pF  
10k  
V
BIAS  
FB  
POWER LOSS  
165k  
27pF  
1%  
100µF  
10V  
TANT  
+
T
PGFB  
PG  
1µF  
SYNC  
GND  
100k  
1%  
3435 TA01  
0.0001 0.001  
0.1  
1
10  
0.01  
0
10  
30  
40  
50  
60  
20  
LOAD CURRENT (A)  
INPUT VOLTAGE (V)  
3435 TA02  
3435 TA03  
3435fa  
1
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