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LTC3789

更新时间： 2024-09-17 14:57:55
品牌 Logo 应用领域
亚德诺 - ADI 开关控制器
页数 文件大小 规格书
30页 529K
描述
高效率、同步、四开关降压-升压型控制器

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中文翻译

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LTC3789 数据手册

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LTC3789  
High Efficiency, Synchronous,  
4-Switch Buck-Boost Controller  
FeaTures  
DescripTion  
The LTC®3789 is a high performance buck-boost switch-  
ing regulator controller that operates from input volt-  
ages above, below or equal to the output voltage. The  
constant-frequency, current mode architecture allows  
a phase-lockable frequency of up to 600kHz, while an  
output current feedback loop provides support for battery  
charging.Withawide4Vto38V(40Vmaximum)inputand  
outputrangeandseamless, lownoisetransitionsbetween  
operating regions, the LTC3789 is ideal for automotive,  
telecom and battery-powered systems.  
n
Single Inductor Architecture Allows V Above,  
IN  
OUT  
Below or Equal to the Regulated V  
n
Programmable Input or Output Current  
n
Wide V Range: 4V to 38V  
IN  
n
1% Output Voltage Accuracy: 0.8V < V  
< 38V  
OUT  
n
n
n
n
n
n
n
n
n
Synchronous Rectification: Up to 98% Efficiency  
Current Mode Control  
Phase-Lockable Fixed Frequency: 200kHz to 600kHz  
No Reverse Current During Start-Up  
Power Good Output Voltage Monitor  
Internal 5.5V LDO  
Theoperatingmodeofthecontrollerisdeterminedthrough  
the MODE/PLLIN pin. The MODE/PLLIN pin can select  
between pulse-skipping mode and forced continuous  
mode operation and allows the IC to besynchronized to an  
external clock. Pulse-skipping mode offers high efficiency  
and low ripple at light loads, while forced continuous  
mode operates at a constant frequency for noise-sensitive  
applications.  
Quad N-Channel MOSFET Synchronous Drive  
V
Disconnected from V During Shutdown  
OUT  
IN  
True Soft-Start and V  
Short Protection, Even in  
OUT  
Boost Mode  
n
Available in 28-Lead QFN (4mm × 5mm) and  
28-Lead SSOP Packages  
applicaTions  
A PGOOD pin indicates when the output is within 10% of  
itsdesignedsetpoint.TheLTC3789isavailableinlowpro-  
file 28-pin 4mm × 5mm QFN and narrow SSOP packages.  
L, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered  
trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks  
are the property of their respective owners. Protected by U.S. Patents, including 5408150,  
5481178, 5929620, 6580258, 7365525, 7394231.  
n
Automotive Systems  
n
Distributed DC Power Systems  
n
High Power Battery-Operated Devices  
Industrial Control  
n
Typical applicaTion  
+
1µF  
CER  
4.7µF  
100Ω  
Efficiency and Power Loss  
–
+
I
INTV  
I
LIM  
CC OSENSE  
100Ω  
2.2µF  
PGOOD  
V
V
I
V
IN  
OSENSE  
EXTV  
0.010Ω  
V
12V  
5A  
100  
95  
90  
85  
80  
75  
70  
12  
10  
8
OUT  
4V TO  
38V  
CC  
V
OUTSNS  
IN  
INSNS  
10µF  
16V  
CER  
+
22µF  
50V  
CER  
330µF  
16V  
D
C
A
B
TG1  
TG2  
LTC3789  
0.1µF  
0.1µF  
BOOST1  
SW1  
BOOST2  
SW2  
6
BG1  
I
BG2  
MODE/PLLIN  
RUN  
TH  
2200pF  
8k  
SS  
ON/OFF  
121k  
4
105k, 1%  
V
FB  
FREQ  
0.01µF  
1000pF  
7.5k  
1%  
2
SGND  
V
LOAD  
= 12V  
= 5A  
OUT  
+
–
I
SENSE SENSE PGND  
0
0
5
10 15 20 25 30 35 40  
(V)  
V
IN  
0.010Ω  
3789 TA01b  
4.7µH  
3789 TA01  
3789fc  
1
For more information www.linear.com/LTC3789  
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