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LT3507A

更新时间： 2023-12-20 18:44:06
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
30页 388K
描述
具 LDO 的三路、单片式降压型稳压器

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LT3507A 数据手册

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LT3507A  
Triple Monolithic Step-Down  
Regulator with LDO  
Description  
Features  
The LT®3507A is a triple, current mode, DC/DC converter  
with internal power switches and a low dropout regulator.  
Theswitchingconvertersarestep-downconverterscapable  
of generating one 2.7A output and two 1.8A outputs. All  
three converters are synchronized to a single oscillator.  
The 2.7A output runs with opposite phase to the other two  
converters, reducing input ripple current. Each regulator  
has independent shutdown and soft-start circuits, and  
generates a power good signal when its output is in regu-  
lation, easing power supply sequencing and interfacing  
with microcontrollers and DSPs.  
n
Wide Input Range: 4V to 36V  
n
One 2.7A and Two 1.8A Output Switching  
Regulators with Internal Power Switches  
n
Low Dropout Linear Regulator with External  
Transistor  
n
Antiphase Switching Reduces Ripple  
n
Independent Run, Tracking/Soft-Start, and Power  
Good Indicators Ease Supply Sequencing  
n
Uses Small Inductors and Ceramic Capacitors  
n
Adjustable, 250kHz to 2.5MHz Switching Frequency,  
Synchronizable Over the Full Range  
n
User Programmable Overvoltage and Undervoltage  
Theswitchingfrequencyissetwithasingleresistoryielding  
arangeof250kHzto2.5MHz.Thehighswitchingfrequency  
allows the use of small inductors and capacitors resulting  
inaverysmalltripleoutputsupply.Theconstantswitching  
frequency, combinedwithlowimpedanceceramiccapaci-  
tors, results in low, predictable output ripple. Frequency  
foldbackandthermalshutdownprovideprotectionagainst  
faultconditions. TheLT3507Aprovideshigheroutputcur-  
rent than available with the LT3507.  
Lockouts  
n
Thermally Enhanced, 38-Lead TSSOP and  
5mm × 7mm QFN Packages  
applications  
n
Automotive  
n
Industrial Supplies  
n
Distributed Power Regulation  
DSP Power  
n
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of  
Linear Technology Corporation. All other trademarks are the property of their respective owners.  
typical application  
5V, 3.3V, 2.5V and 1.8V Step-Down Regulator  
V
IN  
6V TO 36V  
22µF  
V
V
V
IN3  
IN1  
IN2  
BOOST1  
BOOST2  
Start-Up Waveforms—Coincident Tracking  
4.7µH  
0.22µF  
V
OUT1  
1.8V  
2.7A  
SW1  
0.22µF  
10µH  
18.7k  
V
3.3V  
1.5A  
OUT2  
100µF  
SW2  
FB2  
V
V
FB1  
OUT3  
33µF  
680pF  
15k  
25.5k  
V
C1  
34.8k  
11k  
OUT2  
LT3507A  
1V/DIV  
V
V
V
OUT2  
OUT4  
OUT1  
BOOST3  
SW3  
0.22µF  
V
15µH  
OUT3  
5V  
1.8A  
680pF  
25.5k  
V
C2  
53.6k  
10.2k  
22µF  
FB3  
BIAS  
3507 TA01b  
680pF  
1ms/DIV  
25.5k  
DRIVE  
FB4  
V
C3  
V
24.3k  
11.5k  
OUT4  
2.5V  
0.3A  
RT/SYNC  
= 450kHz  
107k  
2.2µF  
GND  
f
SW  
3507A TA01a  
3507afa  
1
For more information www.linear.com/LT3507A  
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