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LTC3565EDD-PBF

更新时间： 2024-02-14 21:06:24
品牌 Logo 应用领域
凌特 - Linear 转换器
页数 文件大小 规格书
20页 594K
描述
1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

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LTC3565EDD-PBF 数据手册

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LTC3565  
1.25A, 4MHz, Synchronous  
Step-Down DC/DC Converter  
FEATURES  
DESCRIPTION  
The LTC®3565 is a constant frequency, synchronous  
step-down DC/DC converter. Intended for medium power  
applications, it operates from a 2.5V to 5.5V input voltage  
range and has a user configurable operating frequency  
up to 4MHz, allowing the use of tiny, low cost capacitors  
and inductors 1mm or less in height. The output voltage is  
adjustablefrom0.6Vto5.5V. Internalsynchronouspower  
switches provide high efficiency. The LTC3565’s current  
mode architecture and external compensation allow the  
transient response to be optimized over a wide range of  
loads and output capacitors.  
■
High Efficiency: Up to 95%  
IN  
■
V Range: 2.5V to 5.5V  
■
High Frequency Operation: Up to 4MHz  
■
Selectable Low Ripple (Typical 25mV  
)
p-p  
Burst Mode® Operation: I = 40μA  
Q
■
■
■
■
Stable with Ceramic Capacitors  
Uses Tiny Capacitors and Inductor  
Low R  
Internal Switches: 0.15Ω  
DS(ON)  
Current Mode Operation for Excellent Line  
and Load Transient Response  
Short-Circuit Protected  
Low Dropout Operation: 100% Duty Cycle  
■
■
■
■
■
■
■
The LTC3565 can be configured for automatic power  
saving Burst Mode operation (I = 40μA) to reduce gate  
charge losses when the load current drops below the level  
required for continuous operation. For reduced noise and  
RF interference, the SYNC/MODE pin can be configured to  
skip pulses or provide forced continuous operation.  
Low Shutdown Current: I ≤ 1μA  
Q
Q
Output Voltages from 0.6V to 5V  
Synchronizable to External Clock  
Supports Pre-Biased Outputs  
Small 10-Lead (3mm × 3mm) DFN or MSOP Package  
To further maximize battery life, the P-channel MOSFET  
is turned on continuously in dropout (100% duty cycle).  
In shutdown, the device draws <1μA.  
, 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, 6498466, 6611131.  
APPLICATIONS  
■
Notebook Computers  
■
Digital Cameras  
■
Cellular Phones  
■
Handheld Instruments  
■
Board Mounted Power Supplies  
TYPICAL APPLICATION  
Efficiency and Power Loss vs Output Current  
Step-Down 2.5V/1.25A Regulator  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
V
IN  
2.5V TO 5.5V  
22μF  
0.1  
SV PV  
IN  
IN  
SYNC/MODE  
RUN  
2.2μH  
V
OUT  
0.01  
0.001  
SW  
PGOOD  
2.5V  
LTC3565  
1.25A  
ITH  
RT  
22μF  
22pF  
12.1k  
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
IN  
IN  
IN  
V
FB  
931k  
294k  
GND  
680pF  
0.0001  
10000  
191k  
0.1  
1
10  
100  
1000  
OUTPUT CURRENT (mA)  
3565 TA01a  
3565 TA01b  
3565f  
1
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