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LT3514

更新时间： 2023-12-20 18:46:22
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
26页 471K
描述
具 100% 占空比操作能力的三通道降压型开关稳压器

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中文翻译

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LT3514 数据手册

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LT3514  
Triple Step-Down Switching  
Regulator with 100%  
Duty Cycle Operation  
DESCRIPTION  
FEATURES  
The LT®3514 consists of three buck regulators (2A, 1A,  
1A output current). The device has a wide operating input  
range of 3.2V to 36V. An on-chip boost regulator allows  
eachchanneltooperateupto100%dutycycle.TheLT3514  
is designed to minimize external component count and  
results in a simple and small application circuit.  
n
Wide Input Voltage Range: 3.2V to 36V  
(40V Transient)  
n
Three Outputs: 2A, 1A, 1A  
n
100% Duty Cycle Operation  
n
Resistor-Programmed Constant Frequency  
n
Short-Circuit Robust  
n
Wide SYNC Range: 350kHz to 2.2MHz  
The LT3514 operates robustly in fault conditions. Cycle-  
by-cycle peak current limit and catch diode current limit  
sensing protect the IC during overload conditions. Ther-  
mal shutdown protects the power switches at elevated  
temperatures. Soft-start helps control the peak inductor  
current during startup.  
n
Anti-Phase Switching Reduces Ripple  
n
Feedback Voltage: 800mV  
n
Independent Run/Soft-Start Pins  
n
Shutdown with UVLO  
n
Internal Compensation  
n
Thermal Shutdown  
n
The LT3514 also features output voltage tracking and  
sequencing, programmable frequency, programmable  
undervoltage lockout, and a power good pin to indicate  
when all outputs are in regulation.  
Tiny 28-Lead (4mm × 5mm) Thermally Enhanced  
QFN Package  
n
24-Lead Exposed Pad TSSOP  
TheLT3514hasonefewerchannel(CH2)thantheLT3504,  
and has one channel (CH3) that outputs 2A instead of 1A.  
The LT3514 in QFN is pin compatible with the LT3504. The  
LT3504 provides four 1A outputs.  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. All other trademarks are the property of their respective  
owners.  
APPLICATIONS  
n
Automotive Battery Regulation  
n
Industrial Control Supplies  
Wall Transformer Regulation  
n
n
Distributed Supply Regulation  
TYPICAL APPLICATION  
LT3514 Start-Up and Shutdown  
Waveform. VIN (Top Trace) Is Ramped  
from OV Up to 8V and Then Back Down  
to 0V. The Other Three Traces Are the  
Triple Buck Regulator  
3.3µH  
4.7µH  
8.2µH  
SKY  
SW1  
1.8V/1A  
Output Voltages of All Three Channels  
100pF  
47pF  
22pF  
SW5  
12.7k  
10.2k  
22µF  
1µF  
DA1  
FB1  
10µH  
LT3514  
V
1V/DIV  
V
IN  
IN  
V
V
5.4V TO 20V  
5V CHANNEL BEGINS  
100% DC OPERATION  
IN  
1µF  
×2  
SW3  
3.3V/2A  
47µF  
TRANSIENT TO 40V  
IN  
EN/UVLO  
31.6k  
10.2k  
3.3V CHANNEL BEGINS  
100% DC OPERATION  
CH4 1V/DIV  
CH3 1V/DIV  
CH1 1V/DIV  
DA3  
FB3  
PG  
PG  
RUN/SS1  
RUN/SS3  
RUN/SS4  
UVLO = ~2.9V  
PARTS SHUTS  
OFF  
SW4  
5V/1A  
22µF  
53.6k  
10.2k  
DA4  
FB4  
47nF  
RT/SYNC  
18.2k  
1MHz  
GND  
3514 TA01b  
100ms/DIV  
3514 TA01a  
3514fa  
For more information www.linear.com/LT3514  
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