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LT3510_12

更新时间： 2024-11-25 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 342K
描述
Monolithic Dual Tracking 2A Step-Down Switching

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LT3510_12 数据手册

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LT3510  
Monolithic Dual Tracking  
2A Step-Down Switching  
Regulator  
FEATURES  
DESCRIPTION  
n
Wide Input Range: 3.1V to 25V  
The LT®3510 is a dual current mode PWM step-down  
DC/DC converter with two internal 2.5A 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 2A 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  
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
Disc Drives  
n
DSL/Cable Modems  
n
Wall Transformer Regulation  
n
The LT3510 is available in a 20-lead TSSOP package with  
exposed leadframe for low thermal resistance.  
Distributed Power Regulation  
n
PCI Cards  
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 2A Step-Down Converter with Output Tracking  
V
IN  
12V  
Efficiency  
4.7μF  
V
V
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
IN1  
IN2  
61.9k  
V
= 3.3V  
= 2.5V  
OUT  
SHDN  
R /SYNC  
T
V
= 5V  
OUT  
BST1  
SW1  
BST2  
SW2  
3.3μH  
4.7μH  
0.47μF  
B360A  
0.47μF  
V
V
= 1.8V  
OUT  
OUT  
PMEG4005  
47μF  
B360A  
PMEG4005  
LT3510  
IND1  
IND2  
V
OUT2  
V
V
1.8V  
2A  
OUT1  
3.3V  
OUT2  
V
OUT1  
2A  
100μF  
10k  
24.9k  
PG1  
FB1  
V
PG2  
FB2  
V
I
= 12V  
= 0A  
IN  
V
C2  
OUT2  
C1  
FREQUENCY = 500kHz  
470pF  
40.2k  
470pF  
40.2k  
SS/TRACK1 SS/TRACK2  
GND  
0
0.5  
LOAD CURRENT (A)  
1.5  
2
1
8.06k  
10pF  
47pF  
8.06k  
0.1μF  
3510 TA01b  
3510 TA01a  
3510fe  
1
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