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LT3501

更新时间： 2024-11-04 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
28页 438K
描述
Monolithic Dual Tracking 3A Step-Down Switching Regulator

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中文翻译

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LT3501 数据手册

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LT3501  
Monolithic Dual Tracking  
3A Step-Down Switching  
Regulator  
FEATURES  
DESCRIPTION  
■
Wide Input Range: 3.1V to 25V  
The LT®3501 is a dual current mode PWM step-down  
DC/DC converter with two internal 3.5A switches. Inde-  
pendent input voltage, feedback, soft-start and power  
good pins for each channel simplify complex power  
supply tracking/sequencing requirements.  
■
Two Switching Regulators with 3A Output Capability  
■
Independent Supply to Each Regulator  
■
Adjustable/Synchronizable Fixed Frequency  
Operation from 250kHz to 1.5MHz  
■
Antiphase Switching  
Outputs Can be Paralleled  
Both converters are synchronized to either a common  
external clock input or a resistor programmable fixed  
250kHz to 1.5MHz internal oscillator. At all frequencies, a  
180° phase relationship between channels is maintained,  
reducingvoltagerippleandcomponentsize.Programmable  
frequency allows for optimization between efficiency and  
external component size.  
■
■
Independent, Sequential, Ratiometric or Absolute  
Tracking Between Outputs  
■
Independent Soft-Start and Power Good Pins  
■
Enhanced Short-Circuit Protection  
■
Low Dropout: 95% Maximum Duty Cycle  
■
Low Shutdown Current: <10µA  
■
Minimum input-to-output voltage ratios are improved  
by allowing the switch to stay on through multiple clock  
cycles, only switching off when the boost capacitor needs  
recharging, resulting in ~95% maximum duty cycle.  
20-Lead TSSOP Package with Exposed Leadframe  
APPLICATIONS  
■
DSP Power Supplies  
Each output can be independently disabled using its own  
soft-start pin, or by using the SHDN pin the entire part can  
be placed in a low quiescent current shutdown mode.  
■
Disc Drives  
■
DSL/Cable Modems  
■
Wall Transformer Regulation  
■
The LT3501 is available in a 20-lead TSSOP package with  
exposed leadframe for low thermal resistance.  
Distributed Power Regulation  
, 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 1.8V Dual 3A Step-Down Converter with Output Tracking  
V
IN  
12V  
Efficiency  
4.7µF  
100  
V
V
IN2  
R /SYNC  
T
IN1  
61.9k  
V
= 3.3V  
= 2.5V  
OUT1  
V
= 5V  
OUT1  
SHDN  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
BST1  
SW1  
BST2  
SW2  
3.3µH  
4.7µH  
0.47µF  
B360A  
0.47µF  
V
= 1.8V  
OUT1  
V
OUT1  
B360A  
PMEG4005  
PMEG4005  
LT3501  
IND1  
IND2  
V
OUT2  
V
V
1.8V  
3A  
OUT1  
3.3V  
3A  
OUT2  
V
OUT1  
47µF  
100µF  
10k  
24.9k  
PG1  
FB1  
PG2  
FB2  
V
C2  
V
= 12V  
OUT2  
FREQUENCY = 500kHz  
IN  
I
= 0A  
V
C1  
470pF  
40.2k  
470pF  
40.2k  
SS/TRACK1 SS/TRACK2  
GND  
0
0.5  
1.5  
2
2.5  
3
1
8.06k  
10pF  
47pF  
8.06k  
LOAD CURRENT (A)  
3501 TA01b  
0.1µF  
3501 TA01a  
3501fb  
1
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