900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf




Linear Technology Electronic Components Datasheet

LTC3542-1 Datasheet

2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3542-1
500mA, 2.25MHz
2.8V Output Synchronous
Step-Down DC/DC Converter
FEATURES
DESCRIPTION
n High Efficiency: Up to 96%
n Fixed Output Voltage: 2.8V
n High Peak Switch Current: 1000mA
n Low Output Ripple (<20mVP-P Typical)
Burst Mode Operation
n Very Low Quiescent Current: Only 26μA
wwwn.Da2t.a5SVheteot45U..5cVomInput Voltage Range
n 2.25MHz Constant Frequency Operation
n 1MHz to 3MHz External Frequency Synchronization
n Low Dropout Operation: 100% Duty Cycle
n No Schottky Diode Required
n Internal Soft-Start Limits Inrush Current
n Shutdown Mode Draws <1μA Supply Current
n ±2% Output Voltage Accuracy
n Current Mode Operation for Excellent Line and Load
Transient Response
n Overtemperature Protected
n Available in 6-Lead 2mm × 2mm DFN
APPLICATIONS
n Cellular Telephones
n Wireless and DSL Modems
n Digital Cameras
n MP3 Players
n PDAs and Other Handheld Devices
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
current during operation is only 26μA, dropping to <1μA in
shutdown. The 2.5V to 5.5V input voltage range makes the
LTC3542-1 ideally suited for single Li-Ion battery-powered
applications. 100% duty cycle provides low dropout opera-
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.
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 LTC3542-1 is specifically designed to work well
with ceramic output capacitors, achieving very low output
voltage ripple and a small PCB footprint.
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.
TYPICAL APPLICATION
VIN
3V TO 5.5V
10μF
VIN SW
LTC3542-1
2.2μH
RUN VOUT
MODE/SYNC
GND
35421 TA01a
VOUT
2.8V
500mA
COUT
10μF
CER
Efficiency and Power Loss vs Output Current
100 1000
90
80
100
70
60
50 10
40
30
20
10
0
0.1
1
VIN = 3.6V
VOUT = 2.8V
0.1
1 10 100 1000
LOAD CURRENT (mA) 35421 TA01b
35421f
1


Linear Technology Electronic Components Datasheet

LTC3542-1 Datasheet

2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter

No Preview Available !

LTC3542-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Supply Voltage (VIN) ........................... –0.3V to 6V
VOUT, 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).... –40°C to 85°C
Junction Temperature (Note 7) ............................. 125°C
Storage Temperature Range................... –65°C to 150°C
Reflow Peak Body Temperature ............................ 260°C
PIN CONFIGURATION
TOP VIEW
VOUT 1
6 RUN
VIN 2 7 5 MODE/SYNC
GND 3
4 SW
DC PACKAGE
6-LEAD (2mm s 2mm) PLASTIC DFN
TJMAX = 125°C, θJA = 89°C/W, θJC = 18°C/W
(SOLDERED TO A 4-LAYER BOARD, NOTE 3)
EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB
www.DataSheet4U.com
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3542EDC-1#PBF
LTC3542EDC-1#TRPBF LDWC
6-Lead (2mm × 2mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l 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
RVOUT
VOUT
ΔVLINE_REG
ΔVLOAD_REG
IS
Operating Voltage Range
Input Resistance of VOUT Pin
Output Feedback Voltage (Note 4)
Reference Voltage Line Regulation (Note 4)
Output Voltage Load Regulation (Note 4)
Input DC Supply Current (Note 5)
Active Mode
Sleep Mode
Shutdown
VIN = 2.5V to 5.5V
ILOAD = 100mA to 500mA
VOUT = 2.5V
VOUT = 2.9V, MODE = 0V
RUN = 0V
l 2.5
5.5
504 840 1176
l 2.744 2.8 2.856
0.04 0.2
0.02 0.2
300 500
26 35
0.1 1
V
V
%/V
%
μA
μA
μA
fOSC
fSYNC
ILIM
RDS(ON)
ISW(LKG)
Oscillator Frequency
Synchronous Frequency
Peak Switch Current
P-Channel On Resistance (Note 6)
N-Channel On Resistance (Note 6)
Switch Leakage Current
VOUT = 2.8V
VOUT = 2.8V
VIN = 3V, VOUT = 2.5V, Duty Cycle < 35%
ISW = 100mA
ISW = –100mA
VIN = 5V, VRUN = 0V, VSW = 0V or 5V
l
1.8
1
650
2.25
1000
0.5
0.35
±0.01
2.7
3
0.65
0.55
±1
MHz
MHz
mA
Ω
Ω
μA
35421f
2


Part Number LTC3542-1
Description 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter
Maker Linear Technology
Total Page 16 Pages
PDF Download

LTC3542-1 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 LTC3542-1 2.25MHz 2.8V Output Synchronous Step-Down DC/DC Converter
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