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LT3434

更新时间： 2023-12-20 18:44:39
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
24页 407K
描述
具 100μA 静态电流的高电压、3A、200kHz 降压型开关稳压器

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LT3434 数据手册

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LT3434  
High Voltage 3A, 200kHz  
Step-Down Switching Regulator  
with 100µA Quiescent Current  
U
DESCRIPTIO  
FEATURES  
The LT®3434 is a 200kHz 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  
200kHz Switching Frequency  
Saturating Switch Design: 0.1Ω  
Peak Switch Current Maintained Over  
Full Duty Cycle Range*  
■
■
■
■
■
■
■
Innovative design techniques integrated in a new high  
voltage 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  
thresholdandtime-out,andthermalshutdownprotection.  
■
■
■
■
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  
The LT3434 is available in a 16-pin TSSOP package with  
Exposed Pad leadframe for low thermal resistance.  
, LTC and LT are registered trademarks of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Burst Mode is a registered  
trademark of Linear Technology Corporation. *Protected by U.S. Patents including  
6498466. **See Burst Mode Operation section for conditions.  
U
TYPICAL APPLICATIO  
Efficiency and Power Loss  
vs Load Current  
Supply Current vs  
Input Voltage  
14V to 3.3V Step-Down Converter with  
150  
125  
100  
75  
100µA No Load Quiescent Current  
100  
75  
50  
25  
0
10  
V
= 3.3V  
V
IN  
= 12V  
OUT  
V
OUT  
= 5V  
V
3.3V  
2A  
OUT  
EFFICIENCY  
V
IN  
V
BOOST  
SW  
IN  
1
4.7µF  
100V  
CER  
33µH  
0.68µF  
4148  
SHDN  
V
OUT  
= 3.3V  
0.1µF  
LT3434  
30MQ100  
C
SS  
0.1  
0.01  
0.001  
V
C
C
470pF  
V
BIAS  
4700pF  
10k  
TYPICAL POWER  
LOSS  
165k  
1%  
50  
27pF  
FB  
100µF  
6.3V  
TANT  
T
PGFB  
PG  
1µF  
SYNC  
GND  
25  
100k  
1%  
0
3434 TA01  
0
10  
30  
40  
50  
60  
20  
0.0001 0.001  
0.1  
0.01  
LOAD CURRENT (A)  
1
10  
INPUT VOLTAGE (V)  
3434 TA02a  
3434 TA02b  
3434fb  
1
1234567...24

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