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LT8391A

更新时间： 2024-09-26 01:08:39
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
30页 1078K
描述
60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum

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LT8391A 数据手册

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LT8390A  
60V 2MHz Synchronous  
4-Switch Buck-Boost Controller  
with Spread Spectrum  
FEATURES  
DESCRIPTION  
TheLT®8390Aisasynchronous4-switchbuck-boostDC/DC  
n
4-Switch Single Inductor Architecture Allows V  
IN  
Above, Below or Equal to V  
controller that regulates output voltage, input or output  
current from an input voltage above, below, or equal to  
the output voltage. The proprietary peak-buck peak-boost  
current mode control scheme allows adjustable and syn-  
chronizable600kHzto2MHzfixedfrequencyoperation, or  
internal25%trianglespreadspectrumfrequencymodula-  
OUT  
n
n
n
n
n
n
n
n
n
n
n
Up to 95% Efficiency at 2MHz  
Proprietary Peak-Buck Peak-Boost Current Mode  
Wide V Range: 4V to 60V  
IN  
±1.5% Output Voltage Accuracy: 1V ≤ V  
≤ 60V  
OUT  
±3% Input or Output Current Accuracy with Monitor  
Spread Spectrum Frequency Modulation for Low EMI tion for low EMI. With a 4V to 60V input voltage range, 0V  
High Side PMOS Load Switch Driver  
No Top MOSFET Refresh Noise in Buck or Boost  
Adjustable and Synchronizable: 600kHz to 2MHz  
to 60V output voltage capability, and seamless low noise  
transitionsbetweenoperationregions,theLT8390Aisideal  
for voltage regulator, battery and supercapacitor charger  
applications in automotive, industrial, telecom, and even  
battery-powered systems.  
V
Disconnected from V During Shutdown  
OUT  
IN  
Available in 28-Lead TSSOP with Exposed Pad and  
28-Lead QFN (4mm × 5mm)  
The LT8390A provides input or output current monitor  
and power good flag. Fault protection is also provided to  
detect output short-circuit condition, during which the  
LT8390A retries, latches off, or keeps running.  
APPLICATIONS  
n
Automotive, Industrial, Telecom Systems  
High Frequency Battery-Powered System  
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog  
Devices, Inc. All other trademarks are the property of their respective owners.  
n
TYPICAL APPLICATION  
95% Efficient 48W (12V 4A) 2MHz Buck-Boost Voltage Regulator  
1µH  
5mΩ  
10mΩ  
V
V
OUT  
IN  
12V  
6V TO 28V  
CONTINUOUS  
4V TO 56V  
22µF  
16V  
×2  
22µF  
63V  
0.1µF  
4A  
0.1µF  
SW1 LSP  
BST1  
LSN  
SW2  
BST2  
0.1µF  
16V  
×2  
0.1µF  
100V  
×2  
22µF  
16V  
TRANSIENT  
Efficiency vs VIN  
4.7µF  
100V  
×2  
100  
90  
80  
70  
60  
50  
INTV  
CC  
INTV  
CC  
BG1  
BG2  
GND  
TG2  
TG1  
LT8390A  
V
V
OUT  
IN  
1µF  
1µF  
383k  
10Ω  
EN/UVLO  
ISP  
1µF  
10Ω  
169k  
110k  
LOADTG  
ISN  
I
I
= 4A  
= 2A  
OUT  
OUT  
TEST  
FB  
SSFM OFF  
CONTINUOUS OPERATION WITH  
HIGHEST COMPONENT TEMPERATURE  
10k  
ISMON  
ISMON  
CTRL  
SYNC/SPRD  
INTV  
CC  
BELOW 90°C (T = 25°C)  
INTV  
SSFM ON  
A
CC  
4.7µF  
0
5
10 15 20 25 30 35 40  
INPUT VOLTAGE (V)  
133k  
100k  
100k  
LOADEN  
V
PGOOD  
RT  
PGOOD  
REF  
SS  
8390a TA01b  
V
C
0.47µF  
59.0k  
2MHz  
22nF  
10k  
2.2nF  
8390a TA01a  
8390afa  
1
For more information www.linear.com/LT8390A  
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