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LTC3544EUD-TRPBF

更新时间： 2024-11-12 05:43:55
品牌 Logo 应用领域
凌特 - Linear 稳压器
页数 文件大小 规格书
16页 291K
描述
Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA

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中文翻译

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LTC3544EUD-TRPBF 数据手册

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LTC3544  
Quad Synchronous  
Step-Down Regulator: 2.25MHz,  
300mA, 200mA, 200mA, 100mA  
FEATURES  
DESCRIPTION  
The LTC®3544 is a quad, high efficiency, monolithic  
■
High Efficiency: Up to 95%  
■
Four Independent Regulators Provide Up to 300mA,  
200mA, 200mA and 100mA Output Current  
2.25V to 5.5V Input Voltage Range  
2.25MHz Constant-Frequency Operation  
No Schottky Diodes Required  
synchronous buck regulator using a constant-frequency,  
current mode architecture. The four regulators operate  
independently with separate run pins. The 2.25V to 5.5V  
input voltage range makes the LTC3544 well suited for  
single Li-Ion/polymer battery-powered applications.  
100% duty cycle provides low dropout operation, ex-  
tending battery runtime in portable systems. Low ripple  
Burst Mode® operation increases efficiency at light loads,  
furtherextendingbatteryruntimewithtypicallyonly20mV  
of ripple.  
■
■
■
■
Extremely Low Channel-to-Channel Transient  
Crosstalk  
■
Low Ripple (20mV ) Burst Mode Operation:  
P-P  
I = 70μA (All Channels On)  
Q
■
■
■
0.8V Reference Allows Low Output Voltages  
Shutdown Mode Draws <1μA Supply Current  
Current Mode Operation for Excellent Line and Load  
Transient Response  
Switching frequency is internally set to 2.25MHz, allowing  
the use of small surface mount inductors and capacitors.  
The internal synchronous switches increase efficiency  
and eliminate the need for external Schottky diodes. Low  
outputvoltagesareeasilysupportedwiththe0.8Vfeedback  
reference voltage.  
■
■
Overtemperature Protected  
Low Profile (3mm × 3mm) 16-Lead QFN Package  
APPLICATIONS  
The LTC3544 is available in a low profile (0.75mm) (3mm  
× 3mm) QFN package.  
■
Cellular Telephones  
■
Personal Information Appliances  
, 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, 6580258, 6304066, 6127815, 6498466, 6611131, 5994885.  
■
Wireless and DSL Modems  
Digital Still Cameras  
Media Players  
■
■
■
Portable Instruments  
TYPICAL APPLICATION  
Efficiency vs Load Current, 300mA  
Channel, All Other Channels Off  
High Efficiency Quad Step-Down Converter  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1
V
IN  
2.25V TO 5.5V  
4.7μF  
V
PV  
IN  
EFFICIENCY  
CER  
CC  
RUN200B  
SW200B  
RUN200A  
SW200A  
V
4.7μH  
3.3μH  
V
OUT3  
0.8V  
200mA  
0.1  
OUT2  
1.5V  
200mA  
93.1k  
LOSS  
V
V
FB200A  
FB200B  
4.7μF  
CER  
4.7μF  
CER  
V
A
= 2.5V  
0.01  
0.001  
0.0001  
100k  
OUT  
= 25°C  
107k  
T
LTC3544  
RUN300  
SW300  
RUN100  
SW100  
V
OUT1  
V
3.3μH  
10μH  
OUT4  
1.8V  
300mA  
1.2V  
100mA  
V
V
V
= 2.7V  
= 3.6V  
= 4.2V  
IN  
IN  
IN  
133k  
59k  
V
FB300  
V
FB100  
4.7μF  
CER  
4.7μF  
CER  
GNDA  
PGND  
107k  
118k  
0.0001  
0.001  
0.01  
0.1  
1
LOAD CURRENT (A)  
3544 TA01b  
3544B TA01a  
3544fa  
1
1234567...16

中文翻译

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