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LT3501_12

更新时间： 2024-11-04 11:45:15
品牌 Logo 应用领域
凌特 - Linear 开关
页数 文件大小 规格书
30页 434K
描述
Monolithic Dual Tracking 3A Step-Down Switching

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LT3501_12 数据手册

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LT3501  
Monolithic Dual Tracking  
3A Step-Down Switching  
Regulator  
FeaTures  
DescripTion  
n
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.  
n
Two Switching Regulators with 3A Output Capability  
n
Independent Supply to Each Regulator  
n
Adjustable/Synchronizable Fixed Frequency  
Operation from 250kHz to 1.5MHz  
n
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.  
n
n
Independent, Sequential, Ratiometric or Absolute  
Tracking Between Outputs  
n
Independent Soft-Start and Power Good Pins  
n
Enhanced Short-Circuit Protection  
n
Low Dropout: 95% Maximum Duty Cycle  
n
Low Shutdown Current: <10µA  
n
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  
n
DSP Power Supplies  
n
Disc Drives  
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.  
n
DSL/Cable Modems  
n
Wall Transformer Regulation  
n
Distributed Power Regulation  
The LT3501 is available in a 20-lead TSSOP package with  
exposed leadframe for low thermal resistance.  
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks  
and ThinSOT is a trademark 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  
Efficiency  
V
, 12V  
IN  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
= 3.3V  
= 2.5V  
OUT1  
V
= 5V  
OUT1  
4.7µF  
V
V
IN2  
R /SYNC  
T
IN1  
61.9k  
SHDN  
V
= 1.8V  
OUT1  
V
OUT1  
BST1  
SW1  
BST2  
SW2  
3.3µH  
4.7µH  
0.47µF  
B360A  
0.47µF  
PMEG4005  
PMEG4005  
24.9k  
B360A  
LT3501  
V
OUT2  
IND1  
IND2  
V
OUT2  
1.8V, 3A  
V
OUT1  
V
I
= 12V  
= 0A  
IN  
V
OUT1  
3.3V, 3A  
100µF  
10k  
OUT2  
PG1  
FB1  
V
PG2  
FB2  
V
C2  
FREQUENCY = 500kHz  
47µF  
0
0.5  
1.5 2.5 3  
LOAD CURRENT (A)  
2
1
C1  
470pF  
40.2k  
470pF  
40.2k  
SS/TRACK1 SS/TRACK2  
GND  
8.06k  
8.06k  
3501 TA01b  
10pF  
47pF  
0.1µF  
3501 TA01a  
3501fd  
1
1234567...30

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