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LT3508HUF-PBF PDF预览

LT3508HUF-PBF

更新时间： 2024-09-18 05:43:31
品牌 Logo 应用领域
凌特 - Linear 稳压器开关
页数 文件大小 规格书
24页 314K
描述
Dual Monolithic 1.4A Step-Down Switching Regulator

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中文翻译

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LT3508HUF-PBF 数据手册

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LT3508  
Dual Monolithic 1.4A  
Step-Down Switching  
Regulator  
FEATURES  
DESCRIPTION  
The LT®3508 is a dual current mode PWM step-down  
DC/DC converter with internal power switches capable of  
generatingtwo1.4Aoutputs. Thewideinputvoltagerange  
of 3.7V to 36V makes the LT3508 suitable for regulating  
power from a wide variety of sources, including automo-  
tivebatteries,24Vindustrialsuppliesandunregulatedwall  
adapters. Bothconvertersaresynchronizedtoasingleos-  
cillatorprogrammableupto2.5MHzandrunwithopposite  
phases, reducing input ripple current. Its high operating  
frequency allows the use of small, low cost inductors and  
ceramic capacitors, resulting in low, predictable output  
ripple. Each regulator has independent tracking and soft-  
start circuits and generates a power good signal when its  
output is in regulation, easing power supply sequencing  
and interfacing with microcontrollers and DSPs.  
n
Wide Input Voltage Range: 3.7V to 36V  
n
Two 1.4A Output Switching Regulators with Internal  
Power Switches  
n
Adjustable 250kHz to 2.5MHz Switching Frequency  
n
Synchronizable over the Full Frequency Range  
n
Anti-Phase Switching Reduces Ripple  
n
Uses Small Inductors and Ceramic Capacitors  
n
Accurate Programmable Undervoltage Lockout  
n
Independent Tracking, Soft-Start and Power Good  
Circuits Ease Supply Sequencing  
Output Adjustable Down to 800mV  
n
n
Small 4mm × 4mm 24-Pin QFN or 16-Pin Thermally  
Enhanced TSSOP Surface Mount Packages  
APPLICATIONS  
n
Automotive  
Cycle-by-cycle current limit, frequency foldback and ther-  
malshutdownprovideprotectionagainstshortedoutputs,  
and soft-start eliminates input current surge during start-  
up. The low current (<2μA) shutdown mode enables easy  
power management in battery-powered systems.  
n
DSP Power Supplies  
n
Wall Transformer Regulation  
n
DSL and Cable Modems  
n
PCI Express  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners.  
TYPICAL APPLICATION  
3.3V and 5V Dual Output Step-Down Converter with Output Sequencing  
V
IN  
ON OFF  
5.6V TO 36V  
Efficiency  
4.7ꢀF  
V
SHDN  
IN  
95  
90  
85  
80  
75  
70  
65  
OUT2  
5V  
V
= 12V  
IN  
BOOST1  
BOOST2  
1.4A  
V
V
= 5V  
OUT2  
OUT1  
0.22ꢀF  
0.22ꢀF  
6.8ꢀH  
10ꢀH  
OUT1  
3.3V  
1.4A  
SW1  
SW2  
= 3.3V  
LT3508  
35.7k  
56.2k  
FB1  
FB2  
V
V
C2  
C1  
11.5k  
22ꢀF  
51k  
TRACK/SS1  
TRACK/SS2  
PG1  
PG2  
43k  
10ꢀF  
10.7k  
GND R /SYNC  
100k  
150pF  
1nF  
T
100pF  
52.3k  
= 700kHz  
0
0.5  
1
1.5  
LOAD CURRENT (A)  
POWER  
GOOD  
f
SW  
3508 TA01a  
3508 TA01b  
3508fb  
1
1234567...24

中文翻译

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