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LTC3785-1

更新时间： 2024-11-06 14:58:07
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 218K
描述
具电源良好指示功能的 10V、高效率、降压-升压型控制器

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中文翻译

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LTC3785-1 数据手册

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LTC3785-1  
10V, High Efficiency,  
Buck-Boost Controller  
with Power Good  
FEATURES  
DESCRIPTION  
The LTC®3785-1 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 LTC3785-1 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
Power Good Output Indicator  
n
2.7V to 10V Input and Output Range  
n
Up to 96% Efficiency  
n
Up to 10A of Output Current  
n
All N-channel MOSFETs, No R  
™
SENSE  
Theoperatingfrequencycanbeprogrammedfrom100kHz  
to 1MHz. The soft-start time and current limit are also  
programmable. The soft-start capacitor doubles as the  
faulttimerwhichcanprogramtheICtolatchofforrecycle  
after a determined off time. Burst Mode operation is user  
controlled and can be enabled by driving the mode pin  
high. The LTC3785-1 includes a power good output that  
indicates when the output voltage is within 7.5% of its  
designed setpoint.  
n
n
n
n
n
n
n
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  
Available in 24-Lead (4mm × 4mm) Exposed Pad  
QFN Package  
Protection features include foldback current limit,  
short-circuit and overvoltage protection.  
APPLICATIONS  
n
Palmtop Computers  
L, LT, LTC ,LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
n
Handheld Instruments  
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners.  
n
Wireless Modems  
n
Cellular Telephones  
TYPICAL APPLICATION  
V
IN  
2.7V  
Efficiency vs Input Voltage  
V
OUT  
4.7μF  
TO 10V  
V
IN  
100  
95  
V
CC  
V
= 3.3V  
= 500kHz  
OUT  
OSC  
F
215k  
127k  
I
SVIN  
TG1  
22μF  
V
SENSE  
1.3k  
215k  
A
I
= 2A  
V
BST1  
LOAD  
270pF  
0.22μF  
SW1  
I
LOAD  
= 1A  
FB  
I
SSW1  
127k  
1nF  
12k  
V
DRV  
BG1  
90  
4.7μH  
LTC3785-1  
I
B
D
V
C
V
3.3V  
5A  
OUT  
RT  
SVOUT  
TG2  
85  
49.9k  
2.5  
5.5  
7
8.5  
10  
4
MODE  
V
IN  
(V)  
37851 TA01b  
PGOOD  
RUN/SS  
V
BST2  
0.22μF  
SW2  
100μF  
I
I
LSET  
SSW2  
CCM  
BG2  
42.2k  
2.2nF  
GND  
C
37851 TA01a  
37851fa  
1
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