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LT8640A

更新时间： 2023-12-20 18:45:09
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
28页 1881K
描述
42V、5A/8A峰值同步降压型Silent Switcher，具有2.5μA静态电流

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中文翻译

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LT8640A 数据手册

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LT8640A  
42V, 5A/8A Peak Synchronous Step-Down  
Silent Switcher with 2.5µA Quiescent Current  
FEATURES  
n
DESCRIPTION  
Silent Switcher® Architecture  
The LT®8640A step-down regulator features Silent  
Switcher architecture designed to minimize EMI emis-  
sions while delivering high efficiency at frequencies up  
to 3MHz. An ultralow 2.5µA quiescent current—with the  
output in full regulation—enables applications requiring  
highest efficiency at very small load currents.  
n
Ultralow EMI Emissions  
n
Spread Spectrum Frequency Modulation  
n
High Efficiency at High Frequency  
n
Up to 96% Efficiency at 1MHz, 12V to 5V  
Up to 95% Efficiency at 2MHz, 12V to 5V  
IN  
IN  
OUT  
OUT  
n
n
n
n
Wide Input Voltage Range: 3.4V to 42V  
The LT8640A allows high V to low V  
conversion at  
IN  
OUT  
5A Maximum Continuous, 8A Peak Transient Output  
high frequency with a fast minimum top switch on-time  
of 30ns. The SYNC/MODE pin selects between Burst  
Mode operation, spread spectrum mode, synchroniza-  
tion to an external clock, and forced continuous mode.  
Ultralow Quiescent Current Burst Mode® Operation  
n
2.5µA I Regulating 12V to 3.3V  
Q
IN  
P-P  
OUT  
n
Output Ripple < 10mV  
n
n
n
n
n
n
n
n
n
Fast Minimum Switch On-Time: 30ns  
Low Dropout Under All Conditions: 100mV at 1A  
Available in Fixed 3.3V Output  
SYNC/  
150°C INTERNAL OUTPUT  
PACKAGE MODE ≠ 0 V COMP GRADE  
CAPS  
(PEAK)  
C
LT8640A  
LT8640  
QFN  
QFN  
FCM  
Internal Yes  
Internal Yes  
Internal Yes  
No  
5A (8A)  
Forced Continuous Mode  
Pulse-  
Skipping  
Safely Tolerates High Reverse Current  
Adjustable and Synchronizable: 200kHz to 3MHz  
Peak Current Mode Operation  
No  
5A (7A)  
LT8640-1  
LT8640S  
LT8643S  
QFN  
LQFN  
LQFN  
FCM  
FCM  
FCM  
FCM  
FCM  
No  
Yes  
Yes  
No  
5A (7A)  
6A (7A)  
6A (7A)  
6A (7A)  
6A (7A)  
Internal  
External  
No  
No  
Output Soft-Start and Tracking  
Small 18-Lead 3mm × 4mm Side Solderable QFN with  
Improved Solder Joint Reliability  
LT8640S-2 LQFN  
LT8643S-2 LQFN  
Internal Yes  
External Yes  
No  
n
AEC-Q100 Qualified for Automotive Applications  
All registered trademarks and trademarks are the property of their respective owners. Protected  
by U.S. patents, including 8823345.  
APPLICATIONS  
n
Automotive and Industrial Supplies  
General Purpose Step-Down  
n
TYPICAL APPLICATION  
12VIN to 5VOUT Efficiency  
5V 5A Step-Down Converter  
100  
95  
90  
85  
80  
75  
70  
65  
60  
3.2  
2.8  
2.4  
2.0  
1.6  
1.2  
0.8  
0.4  
0
V
IN  
5.5V TO 42V  
4.7µF  
1µF  
EN/UV  
V
IN1  
V
IN2  
EFFICIENCY  
1µF  
GND1  
PG  
GND2  
BST  
LT8640A  
3.3µH  
0.1µF  
10pF  
V
5V  
5A  
OUT  
10nF  
SYNC/MODE  
TR/SS  
SW  
BIAS  
POWER LOSS  
1µF  
1M  
100µF  
INTV  
RT  
FB  
CC  
1MHz, L = 3.3µH  
2MHz, L = 2.2µH  
3MHz, L = 1µH  
41.2k  
243k  
GND  
0.5  
1
1.5  
2
2.5  
3
3.5  
4
4.5  
5
f
= 1MHz  
SW  
8640a TA01a  
LOAD CURRENT (A)  
8640a TA01b  
Rev. 0  
1
Document Feedback  
For more information www.analog.com  
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