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LTC3531-3

更新时间： 2024-09-23 11:45:59
品牌 Logo 应用领域
Linear Systems 开关控制器
页数 文件大小 规格书
28页 383K
描述
High Effi ciency, Synchronous, 4-Switch Buck-Boost Controller

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LTC3531-3 数据手册

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LTC3780  
High Efficiency, Synchronous,  
4-Switch Buck-Boost Controller  
FEATURES  
DESCRIPTION  
The LTC®3780 is a high performance buck-boost switch-  
ing regulator controller that operates from input voltages  
above, below or equal to the output voltage. The constant  
frequency current mode architecture allows a phase-lock-  
able frequency of up to 400kHz. With a wide 4V to 30V  
(36V maximum) input and output range and seamless  
transfers between operating modes, the LTC3780 is ideal  
for automotive, telecom and battery-powered systems.  
n
Single Inductor Architecture Allows V Above,  
IN  
Below or Equal to V  
OUT  
n
Wide V Range: 4V to 36V Operation  
IN  
n
Synchronous Rectification: Up to 98% Efficiency  
n
Current Mode Control  
n
±1% Output Voltage Accuracy: 0.8V < V  
< 30V  
OUT  
n
n
n
n
n
n
n
n
n
n
Phase-Lockable Fixed Frequency: 200kHz to 400kHz  
Power Good Output Voltage Monitor  
Internal LDO for MOSFET Supply  
Theoperatingmodeofthecontrollerisdeterminedthrough  
the FCB pin. For boost operation, the FCB mode pin can  
selectamongBurstMode® operation,discontinuousmode  
and forced continuous mode. During buck operation, the  
FCB mode pin can select among skip-cycle mode, discon-  
tinuous mode and forced continuous mode. Burst Mode  
operation and skip-cycle mode provide high efficiency  
operation at light loads while forced continuous mode and  
discontinuous mode operate at a constant frequency.  
Quad N-Channel MOSFET Synchronous Drive  
V
Disconnected from V During Shutdown  
OUT  
IN  
Adjustable Soft-Start Current Ramping  
Foldback Output Current Limiting  
Selectable Low Current Modes  
Output Overvoltage Protection  
Available in 24-Lead SSOP and Exposed Pad  
(5mm × 5mm) 32-Lead QFN Packages  
Fault protection is provided by an output overvoltage  
comparatorandinternalfoldbackcurrentlimiting.Apower  
good output pin indicates when the output is within 7.5%  
of its designed set point.  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
Protected by U.S. Patents including 5481178, 6304066, 5929620, 5408150, 6580258,  
patent pending on current mode architecture and protection  
APPLICATIONS  
n
Automotive Systems  
n
Telecom Systems  
n
DC Power Distribution Systems  
High Power Battery-Operated Devices  
n
n
Industrial Control  
TYPICAL APPLICATION  
High Efficiency Buck-Boost Converter  
V
12V  
5A  
OUT  
V
IN  
5V TO 32V  
Efficiency and Power Loss  
VOUT = 12V, ILOAD = 5A  
100μF  
16V  
CER  
+
22μF  
50V  
CER  
+
330μF  
16V  
1μF  
CER  
4.7μF  
V
IN  
PGOOD INTV  
A
B
D
C
CC  
100  
95  
10  
9
8
7
6
5
4
3
2
1
0
TG2  
TG1  
0.1μF  
0.1μF  
BOOST2  
SW2  
BOOST1  
SW1  
90  
LTC3780  
BG2  
BG1  
PLLIN  
RUN  
85  
I
TH  
105k  
1%  
2200pF  
20k  
ON/OFF  
SS  
V
0.1μF  
OSENSE  
FCB  
80  
75  
70  
SGND  
SENSE SENSE PGND  
7.5k  
1%  
+
–
0
5
10  
15  
V
20  
25  
30  
35  
0.010Ω  
4.7μH  
(V)  
IN  
3780 TA01b  
3780 TA01  
3780fe  
1
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