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3740

更新时间： 2024-09-13 06:20:23
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 233K
描述
Wide Operating Range, Valley Mode, No RSENSE™ Synchronous Step-Down Controller

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3740 数据手册

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LT3740  
Wide Operating Range,  
Valley Mode, No R  
™
SENSE  
Synchronous Step-Down Controller  
FEATURES  
DESCRIPTION  
The LT®3740 is a synchronous step-down switching  
regulator controller that drives N-channel power MOSFET  
stages.Thecontrollerusesvalleycurrentmodearchitecture  
to achieve very low duty cycles with excellent transient  
n
Wide V Range: 2.2V to 22V  
IN  
n
Internal Boost Provides 6V Gate Drive  
For V Down to 2.2V  
IN  
n
No Sensing Resistor Required  
n
Dual N-Channel MOSFET Synchronous Drive  
Valley Current Mode Control  
response without requiring a sense resistor.  
n
n
n
n
n
n
n
n
n
The LT3740 includes an internal step-up converter to  
provide a bias 7.8V higher than the input voltage for the  
drive. This enables the part to work from an input voltage  
as low as 2.2V.  
Optimized for High Step-Down Ratio  
Power Good Output Voltage Monitor  
0.8V Reference  
Three Pin-Selected Current Limit Levels  
Constant Switching Frequency: 300kHz  
Programmable Soft-Start  
The XREF pin is an external reference input that allows the  
user to override the internal 0.8V feedback reference with  
any lower value, allowing full control of the output voltage  
during operation, output voltage tracking or soft-start.  
Output Voltage Tracking  
Available in 16-Pin 5mm × 3mm DFN  
The LT3740 has three current limit levels that can be  
chosen by connecting the RANGE pin to ground, open,  
and input respectively.  
APPLICATIONS  
n
Notebook and Palmtop Computers, PDA  
Portable Instruments  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
n
No R  
is a trademark of Linear Technology Corporation. All other trademarks are the  
SENSE  
property of their respective owners.  
n
Distributed Power Systems  
TYPICAL APPLICATION  
High Efficiency Step-Down Converter  
Efficiency vs Load Current  
V
IN  
94  
92  
90  
88  
3V to 12V  
1μF  
22μH  
LT3740  
BGDP  
10μF  
SWB  
V
= 5V  
IN  
V
= 3V  
IN  
BIAS  
TGATE  
SW  
V
IN  
1Ω  
1Ω  
M1  
HAT2168H  
SHDN  
0.9μH  
V
OUT  
1.8V  
15k  
86  
84  
82  
80  
V
= 12V  
IN  
10A  
SN+  
XREF  
D1  
B320A  
100μF  
s 3  
1Ω  
M2  
HAT2165H  
BGATE  
0.22μF  
39pF  
V
= 1.8V  
OUT  
8
SN–  
15k  
105k  
V
C
0
2
4
6
10  
PGND  
20k  
1nF  
LOAD CURRENT (A)  
RANGE GND FB  
22pF  
3740 TA01b  
80.6k  
3740 TA01a  
3740fc  
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