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LTC3542EDC-1#TRPBF

更新时间： 2024-11-12 13:09:47
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凌特 - Linear 转换器
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LTC3542EDC-1#TRPBF 数据手册

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LTC3542-1  
500mA, 2.25MHz  
2.8V Output Synchronous  
Step-Down DC/DC Converter  
FEATURES  
DESCRIPTION  
The LTC®3542-1 is a high efficiency, fixed output voltage  
of 2.8V, monolithic synchronous buck converter using a  
constant frequency, current mode architecture. Supply  
currentduringoperationisonly26μA, droppingto<1μAin  
shutdown. The2.5Vto5.5Vinputvoltagerangemakesthe  
LTC3542-1ideallysuitedforsingleLi-Ionbattery-powered  
applications.100%dutycycleprovideslowdropoutopera-  
tion, extending battery life in portable systems. Internal  
power switches are optimized to provide high efficiency  
and eliminate the need for an external Schottky diode.  
n
High Efficiency: Up to 96%  
n
Fixed Output Voltage: 2.8V  
n
High Peak Switch Current: 1000mA  
n
Low Output Ripple (<20mV Typical)  
P-P  
Burst Mode Operation  
n
n
n
n
n
n
n
n
n
n
Very Low Quiescent Current: Only 26μA  
2.5V to 5.5V Input Voltage Range  
2.25MHz Constant Frequency Operation  
1MHz to 3MHz External Frequency Synchronization  
Low Dropout Operation: 100% Duty Cycle  
No Schottky Diode Required  
Internal Soft-Start Limits Inrush Current  
Shutdown Mode Draws <1μA Supply Current  
2% Output Voltage Accuracy  
Current Mode Operation for Excellent Line and Load  
Transient Response  
Overtemperature Protected  
Available in 6-Lead 2mm × 2mm DFN  
Switching frequency is internally set at 2.25MHz, allowing  
the use of small surface mount inductors and capacitors,  
and it can synchronize to an external clock signal with a  
frequencyrangeof1MHzto3MHzthroughtheMODE/SYNC  
pin. The LTC3542-1 is specifically designed to work well  
with ceramic output capacitors, achieving very low output  
voltage ripple and a small PCB footprint.  
n
n
The LTC3542-1 can be configured for the power saving  
Burst Mode® Operation. For reduced noise and RF inter-  
ference, the MODE/SYNC pin can be configured for pulse  
skipping operation.  
L, 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, 6304066, 6127815, 6498466, 6611131, 5994885.  
APPLICATIONS  
n
Cellular Telephones  
n
Wireless and DSL Modems  
n
Digital Cameras  
MP3 Players  
PDAs and Other Handheld Devices  
n
n
TYPICAL APPLICATION  
Efficiency and Power Loss vs Output Current  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
2.2μH  
V
OUT  
V
IN  
2.8V  
V
SW  
LTC3542-1  
RUN  
IN  
3V TO 5.5V  
500mA  
10μF  
C
OUT  
10μF  
CER  
V
OUT  
MODE/SYNC  
GND  
35421 TA01a  
1
V
V
= 3.6V  
IN  
OUT  
= 2.8V  
0.1  
1000  
0.1  
1
10  
100  
35421 TA01b  
LOAD CURRENT (mA)  
35421f  
1
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