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LTC3542IS6 数据表(PDF) 1 Page - Linear Integrated Systems

部件名 LTC3542IS6
功能描述  500mA, 2.25MHz Synchronous Step-Down
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制造商  LINEAR [Linear Integrated Systems]
网页  http://www.linearsystems.com
标志 LINEAR - Linear Integrated Systems

LTC3542IS6 数据表(HTML) 1 Page - Linear Integrated Systems

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LTC3542
1
3542fa
500mA, 2.25MHz
Synchronous Step-Down
DC/DC Converter
The LTC
®3542 is a high efficiency monolithic synchronous
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
from 0.6V to VIN. Internal power switches are optimized
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.
The LTC3542 can be configured for the power saving Burst
Mode® Operation. For reduced noise and RF interference,
the MODE/SYNC pin can be configured for pulse skipping
operation.
Cellular Telephones
Wireless and DSL Modems
Digital Cameras
MP3 Players
PDAs and Other Handheld Devices
High Efficiency: Up to 96%
High Peak Switch Current: 1000mA
Low Output Ripple (<20mVP-P Typical)
Burst Mode Operation: Only 26μA
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
, 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.
VIN
LTC3542
RUN
75k
3542 TA01a
150k
22pF
2.2
μH
CIN
10
μF
CER
COUT
10
μF
CER
SW
VIN
2.7V TO 5.5V
VOUT
1.8V
500mA
VFB
MODE/SYNC
GND
Efficiency and Power Loss vs Output Current
OUTPUT CURRENT (mA)
30
90
100
20
10
80
50
70
60
40
0.1
10
100
1000
3542 TA01b
0
100
1000
10
1
0.1
1
VIN = 3.6V
VOUT = 1.8V
FEATURES
DESCRIPTION
APPLICATIONS
TYPICAL APPLICATION


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