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LTC3864

更新时间： 2023-12-20 18:46:00
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
30页 1745K
描述
具 100% 占空比能力的 60V、低 IQ、降压型 DC/DC 控制器

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LTC3864 数据手册

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LTC3864  
60V Low I Step-Down  
Q
DC/DC Controller with  
100% Duty Cycle Capability  
DESCRIPTION  
FEATURES  
The LTC®3864 is a robust, high voltage step-down DC/DC  
controller optimized for automotive and industrial applica-  
tions. It drives a P-channel power MOSFET switch allowing  
100% duty cycle operation. The wide input and output volt-  
age ranges cover a multitude of applications. This device  
has been verified with the failure mode and effects analysis  
(FMEA) procedure for operation during failure conditions.  
n
Wide Operating V Range: 3.5V to 60V  
IN  
n
Wide V  
Range: 0.8V to V  
OUT  
IN  
n
n
n
n
n
n
Low Operating I = 40µA  
Q
Very Low Dropout Operation: 100% Duty Cycle  
Strong High Voltage MOSFET Gate Driver  
Constant Frequency Current Mode Architecture  
Verified FMEA for Adjacent Pin Open/Short  
Selectable High Efficiency Burst Mode® Operation or  
Pulse-Skipping Mode at Light Loads  
The LTC3864 offers excellent light load efficiency, draw-  
ing only 40µA quiescent current in a user programmable  
Burst Mode operation. Its peak current mode, constant  
frequency PWM architecture provides for good control of  
switching frequency and output current limit. The switch-  
ing frequency can be programmed from 50kHz to 850kHz  
with an external resistor and can be synchronized to an  
external clock from 75kHz to 750kHz.  
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Programmable Fixed Frequency: 50kHz to 850kHz  
Phase-Lockable Frequency: 75kHz to 750kHz  
Accurate Current Limit  
Programmable Soft-Start or Voltage Tracking  
Internal Soft-Start Guarantees Smooth Start-Up  
Power Good Output Voltage Monitor  
Low Shutdown I = 7µA  
Q
Available in Small 12-Pin Thermally Enhanced MSOP  
and DFN Packages  
The LTC3864 offers programmable soft-start or output  
tracking. Safety features include overvoltage protection,  
overcurrent and short-circuit protection including fre-  
quency foldback and a power good output signal.  
n
AEC-Q100 Qualified for Automotive Applications  
APPLICATIONS  
The LTC3864 is available in thermally enhanced 12-Pin  
MSOP and 3mm × 4mm DFN packages.  
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Industrial and Automotive Power Supplies  
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Telecom Power Supplies  
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Distributed Power Systems  
TYPICAL APPLICATION  
5.2V to 60V Input, 5V/2A Output, 350kHz Step-Down Converter  
Efficiency  
V
*
IN  
100  
90  
5.2V TO 60V  
10µF  
0.47µF  
V
Burst Mode  
OPERATION  
CAP  
RUN  
IN  
350kHz  
9.09k  
25mΩ  
PLLIN/MODE  
SS  
80  
70  
60  
50  
SENSE  
GATE  
PULSE-SKIPPING  
LTC3864  
3.3nF  
10µH  
V
5V  
2A  
*
OUT  
ITH  
FREQ  
100k  
422k  
47µF  
×2  
V
V
= 12V  
OUT  
IN  
SGND  
= 5V  
PGOOD  
0.01  
0.1  
LOAD CURRENT (A)  
1
V
FB  
PGND  
80.6k  
3864 TA01b  
*V  
FOLLOWS V  
IN  
OUT  
WHEN 3.5V ≤ V ≤ 5.2V  
IN  
3864 TA01a  
Rev C  
1
For more information LTC3864  
1234567...30

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