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LTC3785

更新时间： 2024-09-16 14:58:15
品牌 Logo 应用领域
亚德诺 - ADI 控制器
页数 文件大小 规格书
20页 280K
描述
10V、高效率、同步、No RSENSE 降压-升压型控制器

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中文翻译

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LTC3785 数据手册

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LTC3785  
10V, High Efficiency,  
Synchronous, No R  
SENSE  
Buck-Boost Controller  
FeaTures  
DescripTion  
The LTC®3785 is a high power synchronous buck-boost  
controller that drives all N-channel power MOSFETs from  
input voltages above, below and equal to the output volt-  
age. With an input range of 2.7V to 10V, the LTC3785 is  
well suited for a wide variety of single or dual cell Li-Ion  
or multicell alkaline/NiMH applications.  
n
Single Inductor Architecture Allows V Above,  
IN  
Below or Equal to V  
OUT  
n
n
n
n
n
n
n
n
n
n
n
2.7V to 10V Input and Output Range  
Up to 96% Efficiency  
Up to 10A of Output Current  
All N-channel MOSFETs, No R  
™
SENSE  
True Output Disconnect During Shutdown  
Programmable Current Limit and Soft-Start  
Optional Short-Circuit Shutdown Timer  
Output Overvoltage and Undervoltage Protection  
Programmable Frequency: 100kHz to 1MHz  
Selectable Burst Mode® Operation  
The operating frequency can be programmed from  
100kHz to 1MHz. The soft-start time and current limit are  
also programmable. The soft-start capacitor doubles as  
the fault timer which can program the IC to latch off or  
recycle after a determined off time. Burst Mode opera-  
tion is user controlled and can be enabled by driving the  
MODE pin high.  
Available in 24-Lead (4mm × 4mm) Exposed Pad  
QFN Package  
Protection features include foldback current limit, short-  
circuit and overvoltage protection.  
applicaTions  
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks  
of Linear Technology Corporation. No R  
is a trademark of Linear Technology Corporation.  
SENSE  
n
Palmtop Computers  
All other trademarks are the property of their respective owners.  
n
Handheld Instruments  
n
Wireless Modems  
Cellular Telephones  
n
Typical applicaTion  
V
IN  
2.7V  
V
OUT  
Efficiency vs Input Voltage  
4.7µF  
TO 10V  
V
IN  
V
CC  
100  
V
= 3.3V  
= 500kHz  
OUT  
OSC  
205k  
I
SVIN  
TG1  
F
22µF  
V
SENSE  
1.3k  
270pF  
205k 121k  
95  
90  
85  
V
BST1  
I
= 2A  
LOAD  
0.22µF  
SW1  
FB  
I
= 1A  
LOAD  
I
SSW1  
121k 12k  
1nF  
V
DRV  
BG1  
4.7µH  
LTC3785  
I
V
C
V
3.3V  
5A  
59k  
OUT  
RT  
SVOUT  
TG2  
MODE  
2.5  
5.5  
7
8.5  
10  
4
V
(V)  
IN  
3785 TA01b  
V
BST2  
0.22µF  
RUN/SS  
SW2  
100µF  
I
I
LSET  
SSW2  
42.2k  
CCM  
BG2  
1nF  
GND  
3785 TA01a  
3785fc  
ꢀ
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