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LTC3407AEDD-PBF

更新时间： 2024-09-28 05:43:51
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 283K
描述
Dual Synchronous 600mA, 1.5MHz Step-Down DC/DC Regulator

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LTC3407AEDD-PBF 数据手册

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LTC3407A  
Dual Synchronous 600mA,  
1.5MHz Step-Down  
DC/DC Regulator  
DESCRIPTION  
FEATURES  
n
High Efficiency: Up to 96%  
TheLTC®3407Aisadual,constantfrequency,synchronous  
step-down DC/DC converter. Intended for low power ap-  
plications, it operates from a 2.5V to 5.5V input voltage  
range and has a constant 1.5MHz switching frequency,  
enabling the use of tiny, low cost capacitors and inductors  
1mm or less in height. Each output voltage is adjustable  
from 0.6V to 5V. Internal synchronous 0.35Ω, 1A power  
switches provide high efficiency without the need for  
external Schottky diodes.  
n
Low Ripple (35mV ) Burst Mode Operation;  
Q
1.5MHz Constant Frequency Operation  
No Schottky Diodes Required  
P-P  
I = 40μA  
n
n
n
n
Low R  
Internal Switches: 0.35Ω  
DS(ON)  
Current Mode Operation for Excellent Line  
and Load Transient Response  
Short-Circuit Protected  
Low Dropout Operation: 100% Duty Cycle  
Ultralow Shutdown Current: I < 1μA  
n
n
n
n
n
n
n
n
A user selectable mode input is provided to allow the user  
to trade-off ripple noise for low power efficiency. Burst  
Mode® operation provides the highest efficiency at light  
loads, while Pulse Skip Mode provides the lowest ripple  
noise at light loads.  
Q
Output Voltages from 5V down to 0.6V  
Power-On Reset Output  
Externally Synchronizable Oscillator  
Optional External Soft-Start  
Small Thermally Enhanced MSOP and 3mm × 3mm  
DFN Packages  
To further maximize battery life, the P-channel MOSFETs  
are turned on continuously in dropout (100% duty cycle),  
and both channels draw a total quiescent current of only  
40μA. In shutdown, the device draws <1μA.  
L, LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology Corporation.  
All other trademarks are the property of their respective owners. Protected by U.S. Patents  
including 5481178, 6580258, 6304066, 6127815, 6498466, 6611131.  
APPLICATIONS  
n
PDAs/Palmtop PCs  
n
Digital Cameras  
n
Cellular Phones  
Wireless and DSL Modems  
n
TYPICAL APPLICATION  
1mm High 2.5V/1.8V at 600mA Step-Down Regulators  
LTC3407A Efficiency/Power Loss Curve  
100  
1
V = 2.5V  
IN  
TO 5.5V  
2.5V  
90  
1.8V  
80  
100k  
10μF  
0.1  
RUN/SS2  
V
IN  
RUN/SS1  
70  
MODE/SYNC  
POR  
RESET  
60  
LTC3407A  
50  
40  
0.01  
0.001  
0.0001  
2.2μH  
2.2μH  
V
= 2.5V  
V
= 1.8V  
OUT1  
OUT2  
SW2  
SW1  
AT 600mA  
AT 600mA  
22pF  
887k  
22pF  
30  
20  
V
= 3.3V  
IN  
Burst Mode OPERATION  
V
FB1  
V
10  
0
FB2  
NO LOAD ON OTHER CHANNEL  
887k  
GND  
280k  
442k  
10μF  
10μF  
1
10  
100  
1000  
LOAD CURRENT (mA)  
3407A TA02  
3407A TA01  
3407afa  
1
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