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LT1767EMS8E-3.3#TR PDF预览

LT1767EMS8E-3.3#TR

更新时间： 2024-11-07 13:02:35
品牌 Logo 应用领域
凌特 - Linear 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
页数 文件大小 规格书
16页 243K
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LT1767EMS8E-3.3#TR 数据手册

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LT1767/LT1767-1.8/  
LT1767-2.5/LT1767-3.3/LT1767-5  
Monolithic 1.5A, 1.25MHz  
Step-Down Switching Regulators  
U
DESCRIPTIO  
FEATURES  
The LT®1767 is a 1.25MHz monolithic buck switching  
regulator. Ahighefficiency1.5A, 0.22Ωswitchisincluded  
on the die together with all the control circuitry required to  
complete a high frequency, current mode switching regu-  
lator. Current mode control provides fast transient re-  
sponse and excellent loop stability.  
■
1.5A Switch in a Small MSOP Package  
■
Constant 1.25MHz Switching Frequency  
■
High Power Exposed Pad (MS8E) Package  
Wide Operating Voltage Range: 3V to 25V  
■
■
High Efficiency 0.22Ω Switch  
1.2V Feedback Reference Voltage  
■
■
Fixed Output Voltages of 1.8V, 2.5V, 3.3V, 5V  
New design techniques achieve high efficiency at high  
switching frequencies over a wide operating range. A low  
dropout internal regulator maintains consistent perfor-  
manceoverawiderangeofinputsfrom24VsystemstoLi-  
Ion batteries. An operating supply current of 1mA im-  
proves efficiency, especially at lower output currents.  
Shutdown reduces quiescent current to 6µA. Maximum  
switch current remains constant at all duty cycles. Syn-  
chronization allows an external logic level signal to in-  
crease the internal oscillator from 1.4MHz to 2MHz.  
■
2% Overall Output Tolerance  
■
Uses Low Profile Surface Mount Components  
■
Low Shutdown Current: 6µA  
■
Synchronizable to 2MHz  
■
Current Mode Loop Control  
■
Constant Maximum Switch Current Rating at All Duty  
Cycles*  
U
APPLICATIO S  
■
DSL Modems  
TheLT1767isavailableinan8-pinMSOPfusedleadframe  
package and a low thermal resistance exposed pad pack-  
age. Full cycle-by-cycle short-circuit protection and ther-  
mal shutdown are provided. High frequency operation  
allows the reduction of input and output filtering compo-  
nents and permits the use of chip inductors.  
■
Portable Computers  
■
Wall Adapters  
■
Battery-Powered Systems  
■
Distributed Power  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
*Patent Pending  
U
TYPICAL APPLICATIO  
Efficiency vs Load Current  
95  
12V to 3.3V Step-Down Converter  
D2  
V
V
= 10V  
OUT  
IN  
CMDSH-3  
= 5V  
90  
85  
80  
75  
70  
C2  
0.1µF  
L1  
5µH  
OUTPUT  
3.3V  
BOOST  
V
V
V
= 5V  
OUT  
IN  
IN  
V
IN  
V
SW  
FB  
C
12V  
= 3.3V  
C3  
1.2A*  
OPEN  
OR  
LT1767-3.3  
2.2µF  
CERAMIC  
SHDN  
SYNC GND  
HIGH  
= ON  
V
C
C1  
10µF  
CERAMIC  
D1  
C
1.5nF  
UPS120  
R
C
0
0.2 0.4 0.6 0.8  
1
1.2 1.4  
4.7k  
LOAD CURRENT (A)  
*MAXIMUM OUTPUT CURRENT IS SUBJECT TO THERMAL DERATING.  
1767 TA01  
1767 TA01a  
sn1767 1767fas  
1
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LT1767EMS8E-3.3#TR 替代型号

型号 品牌 替代类型 描述 数据表
LT1767EMS8-3.3#PBF Linear

完全替代

 LT1767 - Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators; Package: MSOP; Pins: 8;
LT1767EMS8-3.3 Linear

完全替代

 Monolithic 1.5A, 1.25MHz Step-Down Switching Regulators

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