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LTC1435C PDF预览

LTC1435C

更新时间： 2024-11-18 22:57:35
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 407K
描述
High Efficiency Low Noise Synchronous Step-Down Switching Regulator

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中文翻译

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LTC1435C 数据手册

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LTC1435  
High Efficiency Low Noise  
Synchronous Step-Down  
Switching Regulator  
U
FEATURES  
DESCRIPTION  
The LTC®1435 is a synchronous step-down switching  
regulator controller that drives external N-channel power  
MOSFETs using a fixed frequency architecture. Burst  
ModeTM operation provides high efficiency at low load  
currents.Amaximumdutycyclelimitof99%provideslow  
dropout operation which extends operating time in bat-  
tery-operated systems.  
■
Dual N-Channel MOSFET Synchronous Drive  
■
Programmable Fixed Frequency  
■
Wide VIN Range: 3.5V to 36V Operation  
■
Ultrahigh Efficiency  
■
Very Low Dropout Operation: 99% Duty Cycle  
■
Low Standby Current  
■
Secondary Feedback Control  
■
Programmable Soft Start  
The operating frequency is set by an external capacitor  
allowing maximum flexibility in optimizing efficiency. A  
secondary winding feedback control pin, SFB, guarantees  
regulation regardless of load on the main output by  
forcing continuous operation. Burst Mode operation is  
inhibited when the SFB pin is pulled low which reduces  
noise and RF interference.  
■
Remote Output Voltage Sense  
■
Logic Controlled Micropower Shutdown: IQ < 25µA  
■
Foldback Current Limiting (Optional)  
■
Current Mode Operation for Excellent Line and Load  
Transient Response  
Output Voltages from 1.19V to 9V  
■
■
Available in 16-LUead Narrow SO and SSOP Packages  
Soft start is provided by an external capacitor which can  
be used to properly sequence supplies. The operating  
currentlevelisuser-programmableviaanexternalcurrent  
sense resistor. Wide input supply range allows operation  
from 3.5V to 30V (36V maximum).  
APPLICATIONS  
■
Notebook and Palmtop Computers, PDAs  
Cellular Telephones and Wireless Modems  
Portable Instruments  
Battery-Operated Devices  
■
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Burst Mode is a trademark of Linear Technology Corporation.  
■
■
DC Power Distribution Systems  
U
TYPICAL APPLICATION  
V
IN  
4.5V TO 28V  
C
V
IN  
OSC  
C
IN  
+
C
OSC  
22µF  
35V  
× 2  
M1  
Si4412DY  
RUN/SS  
TG  
68pF  
C
R
SS  
0.1µF  
SENSE  
0.033Ω  
V
OUT  
I
SW  
TH  
2.9V/3.5A  
L1  
C
D
C
B
LTC1435  
INTV  
10µH  
330pF  
CMDSH-3  
R1  
C
C
R
OUT  
B
C
32.4k  
CC  
+
100µF  
10V  
0.1µF  
10k  
SGND  
BOOST  
R2  
22.1k  
× 2  
D1  
MBRS140T3  
+
100pF  
4.7µF  
M2  
Si4412DY  
V
BG  
OSENSE  
PGND  
SENSE  
–
+
SENSE  
1000pF  
1435 F01  
Figure 1. High Efficiency Step-Down Converter  
1
1234567...20

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