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1765EFE

更新时间： 2024-11-11 12:33:55
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
20页 195K
描述
Monolithic 3A, 1.25MHz Step-Down Switching Regulator

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1765EFE 数据手册

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LT1765/LT1765-1.8/LT1765-2.5/  
LT1765-3.3/LT1765-5  
Monolithic 3A, 1.25MHz  
Step-Down Switching Regulator  
FEATURES  
DESCRIPTION  
The LT®1765 is a 1.25MHz monolithic buck switching  
regulator. A high efficiency 3A, 0.09Ω switch is included  
on the die together with all the control circuitry required  
to construct a high frequency, current mode switching  
regulator. Current mode control provides fast transient  
response and excellent loop stability.  
n
3A Switch in a Thermally Enhanced 16-Lead  
TSSOP or 8-Lead SO Package  
n
Constant 1.25MHz Switching Frequency  
n
Wide Operating Voltage Range: 3V to 25V  
n
High Efficiency 0.09Ω Switch  
1.2V Feedback Reference Voltage  
n
n
Uses Low Profile Surface Mount Components  
New design techniques achieve high efficiency at high  
switching frequencies over a wide operating voltage  
range. A low dropout internal regulator maintains con-  
sistent performance over a wide range of inputs from  
24V systems to Li-Ion batteries. An operating supply  
current of 1mA improves efficiency, especially at lower  
output currents. Shutdown reduces quiescent current to  
15μA. Maximum switch current remains constant at all  
duty cycles. Synchronization allows an external logic level  
signal to increase the internal oscillator into the range of  
1.6MHz to 2MHz.  
n
Low Shutdown Current: 15μA  
n
Synchronizable to 2MHz  
n
Current Mode Loop Control  
n
Constant Maximum Switch Current Rating at  
All Duty Cycles*  
n
Available in 8-Lead SO and 16-Lead Thermally  
Enhanced TSSOP Packages  
APPLICATIONS  
n
DSL Modems  
Full cycle-by-cycle current control and thermal shutdown  
are provided. High frequency operation allows the reduc-  
tion of input and output filtering components and permits  
the use of chip inductors.  
n
Portable Computers  
n
Regulated Wall Adapters  
n
Battery-Powered Systems  
n
Distributed Power  
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
*Patent Pending  
TYPICAL APPLICATION  
5V to 3.3V Step-Down Converter  
Efficiency vs Load Current  
90  
CMDSH-3  
V
V
= 10V  
OUT  
IN  
= 5V  
0.18μF  
85  
80  
75  
70  
1.5μH  
OUTPUT  
3.3V  
BOOST  
INPUT  
5V  
V
V
IN  
SW  
FB  
2.5A  
2.2μF  
CERAMIC  
LT1765-3.3  
OFF ON  
SHDN  
SYNC GND  
V
C
4.7μF  
CERAMIC  
2.2nF  
UPS120  
1765 TA01  
1.0  
1.5  
0
2.0  
0.5  
SWITCH CURRENT (A)  
1765 • TAO1a  
1765fd  
1
1234567...20

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