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LTC3542ES6 PDF预览

LTC3542ES6

更新时间： 2024-09-25 01:12:07
品牌 Logo 应用领域
Linear Systems /
页数 文件大小 规格书
16页 199K
描述
500mA, 2.25MHz Synchronous Step-Down

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LTC3542ES6 数据手册

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LTC3542  
500mA, 2.25MHz  
Synchronous Step-Down  
DC/DC Converter  
FEATURES  
DESCRIPTION  
TheLTC®3542isahighefficiencymonolithicsynchronous  
buck converter using a constant frequency, current mode  
architecture. Supply current during operation is only  
26μA, dropping to <1μA in shutdown. The 2.5V to 5.5V  
input voltage range makes the LTC3542 ideally suited for  
single Li-Ion battery-powered applications. 100% duty  
cycle provides low dropout operation, extending battery  
life in portable systems. The output voltage is adjustable  
■
High Efficiency: Up to 96%  
■
High Peak Switch Current: 1000mA  
■
Low Output Ripple (<20mV Typical)  
Burst Mode Operation: Only 26μA  
P-P  
■
■
■
■
■
■
■
■
■
■
■
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  
0.6V Reference Allows Low Output Voltages  
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 and Small TSOT  
from 0.6V to V . Internal power switches are optimized  
IN  
to provide high efficiency and eliminate the need for an  
external Schottky diode.  
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  
frequency range of 1MHz to 3MHz through the MODE/  
SYNC pin. The LTC3542 is specifically designed to work  
well with ceramic output capacitors, achieving very low  
output voltage ripple and a small PCB footprint.  
■
■
TheLTC3542canbeconfiguredforthepowersavingBurst  
Mode® Operation. For reduced noise and RF interference,  
the MODE/SYNC pin can be configured for pulse skipping  
operation.  
APPLICATIONS  
■
Cellular Telephones  
■
Wireless and DSL Modems  
■
Digital Cameras  
MP3 Players  
, 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.  
■
■
PDAs and Other Handheld Devices  
Efficiency and Power Loss vs Output Current  
TYPICAL APPLICATION  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
1000  
100  
10  
V
V
= 3.6V  
IN  
OUT  
= 1.8V  
2.2μH  
V
OUT  
V
IN  
1.8V  
V
SW  
LTC3542  
RUN  
IN  
2.7V TO 5.5V  
22pF  
C
IN  
500mA  
10μF  
CER  
150k  
V
FB  
C
OUT  
75k  
MODE/SYNC  
GND  
10μF  
CER  
1
3542 TA01a  
0.1  
1000  
0.1  
1
10  
100  
3542 TA01b  
OUTPUT CURRENT (mA)  
3542fa  
1
1234567...16

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