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LTC3769

更新时间： 2024-02-26 07:27:27
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 984K
描述
Fixed Ratio High Power Inductorless (Charge Pump) DC/DC Controller

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中文翻译

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LTC3769 技术参数

是否Rohs认证： 符合生命周期：Active
零件包装代码：QFN包装说明：4 X 4 MM, LEAD FREE, PLASTIC, MO-220WGGD-X, QFN-24
针数：24Reach Compliance Code：compliant
风险等级：2.23Base Number Matches：1

LTC3769 数据手册

 浏览型号LTC3769的Datasheet PDF文件第2页浏览型号LTC3769的Datasheet PDF文件第3页浏览型号LTC3769的Datasheet PDF文件第4页浏览型号LTC3769的Datasheet PDF文件第5页浏览型号LTC3769的Datasheet PDF文件第6页浏览型号LTC3769的Datasheet PDF文件第7页 
LTC7820  
Fixed Ratio High Power  
Inductorless (Charge Pump)  
DC/DC Controller  
FEATURES  
n
DESCRIPTION  
Low Profile, High Power Density, Capable of 500W+ The LTC®7820 is a fixed ratio high voltage high power  
n
n
n
n
n
n
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switched capacitor/charge pump controller. The device  
includes four N-channel MOSFET gate drivers to drive  
external power MOSFETs in voltage divider, doubler or  
inverter configurations. The device achieves a 2:1 step-  
down ratio from an input voltage as high as 72V, a 1:2  
step-up ratio from an input voltage as high as 36V, or a  
1:1 inverting ratio from an input voltage up to 36V. Each  
power MOSFET is switched with 50% duty cycle at a  
constant pre-programmed switching frequency. System  
efficiency can be optimized to over 99%. The LTC7820  
provides a small and cost effective solution for high  
power, non-isolated intermediate bus applications with  
fault protection.  
Soft Switching: 99% Peak Efficiency and Low EMI  
V Max for Voltage Divider (2:1): 72V  
IN  
IN  
V Max for Voltage Doubler (1:2)/Inverter (1:1): 36V  
Wide Bias V Range: 6V to 72V  
CC  
Soft Startup into Steady State Operation  
6.5V to 40V EXTV Input for Improved Efficiency  
CC  
Input Current Sensing and Overcurrent Protection  
Wide Operating Frequency Range: 100kHz to 1MHz  
Output Short-Circuit/OV/UV Protections with  
Programmable Timer and Retry  
n
Thermally Enhanced 28-Pin 4mm × 5mm QFN Package  
APPLICATIONS  
The LTC7820 switching frequency can be linearly  
programmedfrom100kHzto1MHz.Thedeviceisavailable  
in a thermally enhanced 28-lead QFN package with some  
no-connect pins for high voltage compatible pin spacing.  
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Bus Converters  
High Power Distributed Power Systems  
Communications Systems  
Industrial Applications  
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All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 9484799.  
TYPICAL APPLICATION  
Very High Efficiency 5A Voltage Divider  
Efficiency and Power Loss  
vs Load Current  
10Ω  
V
IN  
48V/24V  
R
SENSE  
0.005Ω  
0.1µF  
100Ω  
0.1µF  
100  
99  
98  
97  
96  
95  
2.0  
1.6  
1.2  
0.8  
0.4  
0
V
V
HIGH_SENSE  
CC  
G1  
V
V
= 48V  
= 24V  
IN  
OUT  
EFFICIENCY  
–
I
SENSE  
0.1µF  
BOOST1  
+
I
SENSE  
LTC7820  
SW1  
TIMER  
10µF  
×6  
G2  
f
s
= 100kHz  
1µF  
0.1µF  
RUN  
BOOST2  
V
OUT  
V
V
= 24V  
IN  
24V/12V  
5A*  
12V  
EXTV  
= 12V  
CC  
OUT  
V
10Ω  
LOW  
INTV  
10µF  
CC  
V
LOW_SENSE  
0.1µF  
G3  
10k  
1µF  
POWER LOSS  
UV  
10k  
BOOST3  
0
1
2
3
4
5
HYS_PRGM  
LOAD CURRENT (A)  
10k  
SW3  
7820 TA01b  
* LOAD CURRENT APPLIED  
AFTER STARTUP  
PGOOD  
FREQ  
G4  
CC  
INTV  
INTV  
CC  
10k  
40k  
4.7µF  
GND  
FAULT  
7820 TA01a  
7820fc  
1
For more information www.linear.com/LTC7820  
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中文翻译

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