900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3542 Datasheet

2.25MHz Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3542
500mA, 2.25MHz
Synchronous Step-Down
DC/DC Converter
FEATURES
DESCRIPTION
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
www.Da2t.a2S5hMeeHt4zUC.coonmstant 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
APPLICATIONS
Cellular Telephones
Wireless and DSL Modems
Digital Cameras
MP3 Players
PDAs and Other Handheld Devices
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.
, 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.
TYPICAL APPLICATION
VIN
2.7V TO 5.5V
CIN
10μF
CER
VIN SW
LTC3542
RUN VFB
MODE/SYNC
GND
2.2μH
22pF
150k
75k
VOUT
1.8V
500mA
COUT
10μF
CER
3542 TA01a
Efficiency and Power Loss vs Output Current
100
VIN = 3.6V
90 VOUT = 1.8V
80
70
1000
100
60
50 10
40
30
1
20
10
0 0.1
0.1 1 10 100 1000
OUTPUT CURRENT (mA) 3542 TA01b
3542fa
1


Linear Technology Electronic Components Datasheet

LTC3542 Datasheet

2.25MHz Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3542
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (VIN) ........................... –0.3V to 6V
VFB, RUN Voltages .......................................–0.3V to VIN
MODE Voltage................................–0.3V to (VIN + 0.3V)
SW Voltage ....................................–0.3V to (VIN + 0.3V)
Operating Temperature Range (Note 2)
LTC3542E ............................................ –40°C to 85°C
LTC3542I ........................................... –40°C to 125°C
Junction Temperature (Note 7) ............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23............................................................ 300°C
Reflow Peak Body Temperature (DFN) .................. 260°C
PIN CONFIGURATION
www.DataSheet4U.com
TOP VIEW
VFB 1
6 RUN
VIN 2
7
5
MODE/
SYNC
GND 3
4 SW
DC PACKAGE
6-LEAD (2mm × 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 102°C/W, θJC = 20°C/W (SOLDERED TO A 4-LAYER BOARD, NOTE 3)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
VIN 1
GND 2
VFB 3
6 SW
5 MODE/SYNC
4 RUN
S6 PACKAGE
6-LEAD PLASTIC TSOT-23
TJMAX = 125°C, θJA = 215°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3542EDC#PBF
LTC3542EDC#TRPBF
LCFR
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 85°C
LTC3542IDC#PBF
LTC3542IDC#TRPBF
LCFR
6-Lead (2mm × 2mm) Plastic DFN
–40°C to 125°C
LTC3542ES6#PBF
LTC3542ES6#TRPBF
LCFS
6-Lead Plastic TSOT-23
–40°C to 85°C
LTC3542IS6#PBF
LTC3542IS6#TRPBF
LCFS
6-Lead Plastic TSOT-23
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN
IFB
VFB
ΔVLINE_REG
ΔVLOAD_REG
Operating Voltage Range
Feedback Input Current
Feedback Voltage (Note 4)
Reference Voltage Line Regulation (Note 4) VIN = 2.5V to 5.5V
Output Voltage Load Regulation (Note 4) ILOAD = 100mA to 500mA
2.5
5.5
±30
0.588 0.6 0.612
0.04 0.2
0.02 0.2
V
nA
V
%/V
%
3542fa
2


Part Number LTC3542
Description 2.25MHz Synchronous Step-Down DC/DC Converter
Maker Linear Technology
Total Page 16 Pages
PDF Download

LTC3542 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 LTC3541 synchronous buck DC/DC converter
Linear Technology
2 LTC3541-1 High Efficiency Buck + VLDO Regulator
Linear
3 LTC3541-2 High Efficiency Buck + VLDO Regulator
Linear Technology
4 LTC3541-3 High Efficiency Buck + VLDO Regulator
Linear Technology
5 LTC3542 2.25MHz Synchronous Step-Down DC/DC Converter
Linear Technology
6 LTC3542-1 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter
Linear Technology
7 LTC3543 600mA Synchronous Step Down Buck Regulator
Linear Technology
8 LTC3544 Quad Synchronous Step-Down Regulator
Linear Technology
9 LTC3544B Quad Synchronous Step-Down Regulator
Linear Technology





Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

Site map

Webmaste! click here

Contact us

Buy Components

Privacy Policy