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LT3407IDD-2

更新时间： 2024-11-24 10:42:07
品牌 Logo 应用领域
凌特 - Linear 光电二极管
页数 文件大小 规格书
16页 221K
描述
Dual Switching Controller, Current-mode, 1.6A, 2700kHz Switching Freq-Max, PDSO10

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LT3407IDD-2 数据手册

 浏览型号LT3407IDD-2的Datasheet PDF文件第2页浏览型号LT3407IDD-2的Datasheet PDF文件第3页浏览型号LT3407IDD-2的Datasheet PDF文件第4页浏览型号LT3407IDD-2的Datasheet PDF文件第5页浏览型号LT3407IDD-2的Datasheet PDF文件第6页浏览型号LT3407IDD-2的Datasheet PDF文件第7页 
LTC3407-2  
Dual Synchronous, 800mA,  
2.25MHz Step-Down  
DC/DC Regulator  
U
DESCRIPTIO  
FEATURES  
The LTC®3407-2 is a dual, constant frequency, synchro-  
nous step down DC/DC converter. Intended for low power  
applications, it operates from 2.5V to 5.5V input voltage  
range and has a constant 2.25MHz switching frequency,  
allowing the use of tiny, low cost capacitors and inductors  
with a profile ≤1.2mm. Each output voltage is adjustable  
from 0.6V to 5V. Internal synchronous 0.35Ω, 1.2A power  
switches provide high efficiency without the need for  
external Schottky diodes.  
■
High Efficiency: Up to 95%  
Very Low Quiescent Current: Only 40μA  
2.25MHz Constant Frequency Operation  
High Switch Current: 1.2A on Each Channel  
No Schottky Diodes Required  
Low RDS(ON) Internal Switches: 0.35Ω  
Current Mode Operation for Excellent Line  
■
■
■
■
■
■
and Load Transient Response  
Short-Circuit Protected  
Low Dropout Operation: 100% Duty Cycle  
Ultralow Shutdown Current: IQ < 1μA  
Output Voltages from 5V down to 0.6V  
Power-On Reset Output  
Externally Synchronizable Oscillator  
■
■
A user selectable mode input is provided to allow the user  
to trade-off noise ripple for low power efficiency. Burst  
Mode® operation provides high efficiency at light loads,  
while Pulse Skip Mode provides low noise ripple at light  
loads.  
■
■
■
■
■
Small Thermally Enhanced MSOP and 3mm × 3mm  
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.  
DFN Packages  
U
APPLICATIO S  
■
PDAs/Palmtop PCs  
■
, LT, LTC, LTM, and Burst Mode are registered trademarks of Linear Technology  
Corporation. All other trademarks are the property of their respective owners.  
Digital Cameras  
Cellular Phones  
Portable Media Players  
PC Cards  
■
■
■
■
Wireless and DSL Modems  
U
TYPICAL APPLICATIO  
V
= 2.5V*  
TO 5.5V  
LTC3407-2 Efficiency Curve  
IN  
R5  
100  
C1  
100k  
10μF  
RUN2  
V
RUN1  
POR  
IN  
95  
90  
85  
80  
75  
70  
65  
60  
2.5V  
MODE/SYNC  
RESET  
1.8V  
LTC3407-2  
L2  
L1  
2.2μH  
2.2μH  
V
= 2.5V  
OUT2  
AT 800mA  
V
= 1.8V  
OUT1  
SW2  
SW1  
AT 800mA  
C5, 22pF  
C4, 22pF  
V
V
FB1  
FB2  
R4  
887k  
R2  
604k  
GND  
C3  
10μF  
C2  
10μF  
V
= 3.3V  
R3  
280k  
R1  
301k  
IN  
Burst Mode OPERATION  
NO LOAD ON OTHER CHANNEL  
1
10  
100  
1000  
3407 TA01  
C1, C2, C3: TAIYO YUDEN JMK316BJ106ML  
L1, L2: MURATA LQH32CN2R2M33  
LOAD CURRENT (mA)  
*V CONNECTED TO V FOR V ≤ 2.8V  
OUT  
IN IN  
3407 TA02  
Figure 1. 2.5V/1.8V at 800mA Step-Down Regulators  
34072fa  
1
1234567...16

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