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LTC3785EUF-PBF PDF预览

LTC3785EUF-PBF

更新时间: 2024-11-05 05:43:55
品牌 Logo 应用领域
凌特 - Linear 电阻器控制器
页数 文件大小 规格书
20页 255K
描述
10V, High Effi ciency, Synchronous, No RSENSE Buck-Boost Controller

LTC3785EUF-PBF 数据手册

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LTC3785  
10V, High Efficiency,  
TM  
Synchronous, No R  
SENSE  
Buck-Boost Controller  
U
DESCRIPTIO  
FEATURES  
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 multi-cell alkaline/NiMH applications.  
Single Inductor Architecture Allows V Above,  
IN  
Below or Equal to V  
OUT  
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  
Available in 24-Lead (4mm × 4mm) Exposed Pad  
QFN Package  
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.  
Protection features include foldback current limit, short-  
circuit and overvoltage protection.  
U
APPLICATIO S  
, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology  
Palmtop Computers  
Corporation. No R  
is a trademark of Linear Technology Corporation.  
SENSE  
All other trademarks are the property of their respective owners.  
Handheld Instruments  
Wireless Modems  
Cellular Telephones  
U
TYPICAL APPLICATIO  
V
IN  
2.7V  
V
OUT  
4.7µF  
TO 10V  
V
IN  
V
CC  
I
SVIN  
TG1  
Efficiency vs Input Voltage  
22µF  
V
SENSE  
100  
V
= 3.3V  
= 500kHz  
V
OUT  
OSC  
BST1  
F
SW1  
FB  
I
SSW1  
V
DRV  
BG1  
95  
90  
85  
4.7µH  
I
= 2A  
LOAD  
LTC3785  
I
V
C
I
LOAD  
= 1A  
V
3.3V  
5A  
OUT  
RT  
SVOUT  
TG2  
MODE  
V
BST2  
2.5  
5.5  
7
8.5  
10  
RUN/SS  
SW2  
SSW2  
4
100µF  
I
I
LSET  
V
(V)  
IN  
3785 TA01b  
CCM  
BG2  
GND  
3785 TA01a  
3785f  
1

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