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CB2016T2R2M

更新时间： 2024-11-06 12:49:15
品牌 Logo 应用领域
Linear Systems 电感器测试功率感应器
页数 文件大小 规格书
16页 278K
描述
Dual Monolithic 300mA Synchronous Step-Down Regulaor

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CB2016T2R2M 数据手册

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LTC3547  
Dual Monolithic  
300mA Synchronous  
Step-Down Regulator  
U
DESCRIPTIO  
FEATURES  
The LTC®3547 is a dual, 2.25MHz, constant-frequency,  
synchronous step-down DC/DC converter in a tiny 3mm  
× 2mm DFN package. 100% duty cycle provides low drop-  
out operation, extending battery life in portable systems.  
Low output voltages are supported with the 0.6V feed-  
back reference voltage. Each regulator can supply 300mA  
continuous output current.  
■
High Efficiency Dual Step-Down Outputs: Up to 96%  
■
300mA Output Current per Channel at V = 3V  
IN  
■
■
Automatic Low Ripple Burst Mode Operation  
(20mV )  
P-P  
Only 40µA Quiescent Current During Operation  
(Both Channels)  
■
■
■
■
■
■
2.25MHz Constant-Frequency Operation  
2.5V to 5.5V Input Voltage Range  
Low Dropout Operation: 100% Duty Cycle  
Internally Compensated for All Ceramic Capacitors  
Independent Internal Soft-Start for Each Channel  
Current Mode Operation for Excellent Line and Load  
Transient Response  
The input voltage range is 2.5V to 5.5V, making it ideal for  
Li-Ion and USB powered applications. Supply current dur-  
ingoperationisonly40µAanddropsto<1µAinshutdown.  
Automatic Burst Mode® operation increases efficiency at  
light loads, further extending battery life.  
■
■
■
■
An internally set 2.25MHz switching frequency allows  
the use of tiny surface mount inductors and capacitors.  
Internal soft-start reduces inrush current during start-  
up. All outputs are internally compensated to work with  
ceramic capacitors. The LTC3547 is available in a low  
profile(0.75mm)3mm×2mmDFNpackage.TheLTC3547  
is also available in a fixed output voltage configuration,  
eliminating the need for the external feedback networks  
(see Table 2).  
0.6V Reference Allows Low Output Voltages  
Short-Circuit Protected  
Ultralow Shutdown Current: I < 1µA  
Q
Low Profile (0.75mm) 8-Lead 3mm × 2mm  
DFN Package  
U
APPLICATIO S  
■
Cellular Telephones  
■
Digital Still Cameras  
, 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 6580258, 5481178, 6304066, 6127815, 6498466, 6611131.  
■
Wireless and DSL Modems  
■
PDAs/Palmtop PCs  
■
Portable Media Players  
U
Efficiency vs Output Current  
TYPICAL APPLICATIO  
for V  
= 2.5V  
OUT  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
Dual Monolithic Buck Regulator in 8-Lead 3mm × 2mm DFN  
V
IN  
2.5V TO 5.5V  
0.1  
4.7µF  
RUN2  
V
RUN1  
IN  
L2  
4.7µH  
L1  
4.7µH  
LTC3547  
SW2  
SW1  
0.01  
0.001  
0.0001  
V
V
OUT1  
OUT2  
2.5V AT  
300mA  
1.8V AT  
300mA  
10pF  
475k  
10pF  
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
IN  
IN  
IN  
V
FB2  
V
FB1  
GND  
475k  
4.7µF  
4.7µF  
237k  
150k  
0.1  
1
10  
100  
1000  
3547 TA01  
OUTPUT CURRENT (mA)  
3547 TA01b  
3547fa  
1
1234567...16

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