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LTC1436AIGN-PLL#TR PDF预览

LTC1436AIGN-PLL#TR

更新时间： 2024-11-19 20:01:35
品牌 Logo 应用领域
凌特 - Linear /
页数 文件大小 规格书
28页 490K
描述
LTC1436A - High Efficiency Low Noise Synchronous Step-Down Switching Regulators; Package: SSOP; Pins: 24; Temperature Range: -40°C to 85°C

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中文翻译

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LTC1436AIGN-PLL#TR 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
零件包装代码：SSOP针数：24
Reach Compliance Code：not_compliant风险等级：5.74
Base Number Matches：1

LTC1436AIGN-PLL#TR 数据手册

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LTC1436A  
LTC1436A-PLL/LTC1437A  
High Efficiency Low Noise  
Synchronous Step-Down  
Switching Regulators  
U
FEATURES  
DESCRIPTIO  
The LTC®1436A/LTC1437A are synchronous step-down  
switching regulator controllers that drive external  
N-channel power MOSFETs in a phase lockable, fixed  
frequencyarchitecture.TheAdaptivePowerTM outputstage  
selectively drives two N-channel MOSFETs at frequencies  
up to 400kHz while reducing switching losses to maintain  
high efficiencies at low output currents.  
■
Maintains Constant Frequency at Low Output Currents  
■
Programmable Fixed Frequency (PLL Lockable)  
■
Wide VIN Range: 3.5V to 36V Operation  
■
Low Minimum On-Time (≤300ns) for High  
Frequency, Low Duty Cycle Applications  
Dual N-Channel MOSFET Synchronous Drive  
Very Low Dropout Operation: 99% Duty Cycle  
Low Dropout, 0.5A Linear Regulator for CPU I/O  
or Low Noise Audio Supplies  
■
■
■
An auxiliary 0.5A linear regulator using an external PNP  
pass device provides a low noise, low dropout voltage  
source. A secondary winding feedback control pin (SFB)  
guarantees regulation regardless of the load on the main  
output by forcing continuous operation.  
■
■
■
■
■
■
■
■
■
Built-In Power-On Reset Timer  
Programmable Soft Start  
Low-Battery Detector  
Remote Output Voltage Sense  
Foldback Current Limiting (Optional)  
Pin Selectable Output Voltage  
An additional comparator is available for use as a low-  
batterydetector. Apower-onresettimer(POR)isincluded  
which generates a signal delayed by 65536/fCLK (300ms  
typically) after the output is within 5% of the regulated  
output voltage. Internal resistive dividers provide pin  
selectable output voltages with remote sense capability.  
Logic Controlled Micropower Shutdown: IQ < 25µA  
Output Voltages from 1.19V to 9V  
Available in 24-Lead Narrow SSOP and 28-Lead  
SSOP Packages U  
APPLICATIO S  
The operating current level is user-programmable via an  
external current sense resistor. Wide input supply range  
allows operation from 3.5V to 30V (36V maximum).  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
Adaptive Power is a trademark of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
Protected by U.S. Patents, including 5481178, 6304066, 5929620, 6580258,  
5705919, 5731731  
■
Notebook and Palmtop Computers, PDAs  
■
Cellular Telephones and Wireless Modems  
■
Portable Instruments  
■
Battery-Operated Devices  
■
DC Power Distribution Systems  
U
TYPICAL APPLICATIO  
V
IN  
4.5V TO 22V  
C
V
OSC  
IN  
C
IN  
C
+
OSC  
M1  
Si4412DY  
22µF  
35V  
× 2  
TGL  
TGS  
43pF  
RUN/SS  
M3  
C
SS  
IRLML2803  
0.1µF  
SW  
L1  
4.7µH  
R
SENSE  
0.02Ω  
I
D
B
CMDSH-3  
TH  
V
1.6V  
5A  
OUT  
C
B
R
LTC1436A  
C
C
C
0.1µF  
10k  
INTV  
CC  
510pF  
SGND  
BOOST  
R1  
+
100pF  
C
D1  
MBRS140T3  
4.7µF  
35.7k  
OUT  
+
M2  
Si4412DY  
100µF  
6.3V  
× 2  
V
V
PROG  
BG  
R2  
102k  
OSENSE  
SENSE  
PGND  
+
–
SENSE  
1000pF  
1436 F01  
Figure 1. High Efficiency Step-Down Converter  
14367afb  
1
1234567...28

中文翻译

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