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LTC3419

更新时间： 2024-09-26 14:58:11
品牌 Logo 应用领域
亚德诺 - ADI 稳压器
页数 文件大小 规格书
16页 258K
描述
双通道单片式600mA同步降压型稳压器

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中文翻译

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LTC3419 数据手册

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LTC3419  
Dual Monolithic 600mA  
Synchronous Step-Down  
Regulator  
FEATURES  
DESCRIPTION  
The LTC®3419 is a dual, 2.25MHz, constant-frequency,  
synchronous step-down DC/DC converter in a tiny  
3mm × 3mm DFN package. 100% duty cycle provides  
low dropout operation, extending battery life in portable  
systems. Lowoutputvoltagesaresupportedwiththe0.6V  
feedback reference voltage. Each regulator can supply  
600mA output current.  
n
High Efficiency Dual Step-Down Outputs: Up to 96%  
n
600mA Current per Channel at V = 3V  
IN  
n
Only 35μA Quiescent Current During Operation  
(Both Channels)  
n
2.25MHz Constant-Frequency Operation  
n
2.5V to 5.5V Input Voltage Range  
n
Low Dropout Operation: 100% Duty Cycle  
n
No Schottky Diodes Required  
The input voltage range is 2.5V to 5.5V, making it ideal  
for Li-Ion and USB powered applications. Supply current  
during operation is only 35μA and drops to <1μA in  
shutdown. A user-selectable mode input allows the user  
to trade off between high efficiency Burst Mode operation  
and pulse-skipping mode.  
n
Internally Compensated for All Ceramic Capacitors  
n
Independent Internal Soft-Start for Each Channel  
n
Available in Fixed Output Versions  
n
Current Mode Operation for Excellent Line and Load  
Transient Response  
n
0.6V Reference Allows Low Output Voltages  
User-Selectable Burst Mode® Operation  
n
An internally set 2.25MHz switching frequency allows the  
useoftinysurfacemountinductorsandcapacitors. Internal  
soft-start reduces inrush current during start-up. Both  
outputs are internally compensated to work with ceramic  
outputcapacitors. TheLTC3419isavailableinalowprofile  
(0.75mm)3mm×3mmDFNpackage.TheLTC3419isalso  
available in a fixed output voltage configuration selected  
via internal resistor dividers (see Table 2).  
n
Short-Circuit Protected  
Ultralow Shutdown Current: I < 1μA  
Available in Small MSOP or 3mm × 3mm DFN-8  
Packages  
n
Q
n
APPLICATIONS  
n
Cellular Telephones  
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.  
Burst Mode is a registered trademark of Linear Technology Corporation. All other  
trademarks are the property of their respective owners. Protected by U.S. Patents,  
including 5481178, 6127815, 6304066, 6498466, 6580258, 6611131.  
n
Digital Still Cameras  
n
Wireless and DSL Modems  
n
Portable Media Players  
n
PDAs/Palmtop PCs  
Efficiency and Power Loss  
vs Output Current  
TYPICAL APPLICATION  
Dual Monolithic Buck Regulator in 8-Lead 3 × 3 DFN  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
10  
V
= 3.6V  
IN  
V
IN  
2.5V TO 5.5V  
1
10μF  
RUN2  
V
IN  
RUN1  
MODE  
0.1  
LTC3419  
SW2  
SW1  
3.3μH  
22pF  
3.3μH  
22pF  
V
V
OUT1  
OUT2  
2.5V AT  
600mA  
1.8V AT  
600mA  
0.01  
0.001  
0.0001  
V
OUT  
V
OUT  
V
OUT  
= 1.2V  
= 1.8V  
= 2.5V  
V
FB2  
V
FB1  
GND  
118k  
187k  
10μF  
10μF  
59k  
59k  
0.1  
1
10  
100  
1000  
3419 TA01  
OUTPUT CURRENT (mA)  
3419 TA01b  
3419fa  
1
1234567...16

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