900,000+ datasheet pdf search and download

Datasheet4U offers most rated semiconductors data sheet pdf






Exar

XRP7674 Datasheet Preview

XRP7674 Datasheet

2A 18V Synchronous PFM/PWM Step-Down Regulator

No Preview Available !

XRP7674
2A 18V Synchronous PFM/PWM Step-Down Regulator
February 2013
GENERAL DESCRIPTION
The XRP7674 is a 2A capable synchronous
current-mode PWM step down (buck) voltage
regulator with improved light current load
efficiency. A wide 4.5V to 18V input voltage
range allows for single supply operations from
industry standard 5V and 12V power rails.
With a 340kHz constant operating frequency
and integrated high and low-side
100mΩ/100mΩ MOSFETs, the XRP7674
reduces the overall component count and
solution footprint. Current-mode control
provides fast transient response and cycle-by-
cycle OCP. An adjustable soft-start prevents
inrush current at turn-on, and in shutdown
mode the supply current drops to 0.1µA. At
light current loads, the XRP7674 operates in
Discontinuous Conduction Mode (DCM) and is
complemented by a pulse frequency
modulation mode (PFM) to provide excellent
conversion efficiency.
Built-in output over-voltage (open load), over
temperature, cycle-by-cycle over-current,
under-voltage lockout (UVLO) and hiccup
mode short-circuit protection insures safe
operation under abnormal operating
conditions.
The XRP7674 is offered in a RoHS compliant,
“green”/halogen free 8-pin SOIC package.
Rev. 1.0.0
APPLICATIONS
Distributed Power Architecture
Portable Equipment
Point of Load Converter
Audio-Video Equipment
FEATURES
2A Continuous Output Current
4.5V to 18V Wide Input Voltage
0.925V to 16V Adjustable Output Voltage
±2% Output Voltage Accuracy
PWM Current-Mode Control
340kHz Constant Operations
Up to 95% Efficiency
Light-Load efficiency
Discontinuous Conduction Mode (DCM)
Pulse Frequency Modulation Mode (PFM)
Programmable Soft-Start and Enable
Function
Built-in Thermal, Over-Current, UVLO,
Output Over-Voltage and hiccup mode
short-circuit protection
RoHS Compliant, “Green”/Halogen
Free 8-Pin SOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7674 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. +1 510 668-7000 Fax. +1 510 668-7001




Exar

XRP7674 Datasheet Preview

XRP7674 Datasheet

2A 18V Synchronous PFM/PWM Step-Down Regulator

No Preview Available !

XRP7674
2A 18V Synchronous PFM/PWM Step-Down Regulator
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extended periods of time may affect
reliability.
Supply Voltage VIN...................................... -0.3V to 20V
Switch Node Voltage VSW ......................................... 21V
Boost Voltage VBS ................................... -0.3 to VSW+6V
Enable Voltage VEN......................................... -0.3 to VIN
All Other Pins .............................................. -0.3 to +6V
Junction Temperature .......................................... 150°C
Storage Temperature .............................. -65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 260°C
ESD Rating (HBM - Human Body Model) .................... 2kV
ESD Rating (MM - Machine Model) ...........................200V
Moisture Sensitivity Level (MSL) ................................... 3
OPERATING RATINGS
Input Voltage VIN .........................................4.5V to 18V
Ambient Operating Temperature ................ -40°C to 85°C
Maximum Output Current.................................... 2A min
Thermal Resistance θJA .....................................105°C/W
ELECTRICAL SPECIFICATIONS
Specifications are for an Operating Ambient Temperature of TA = 25°C only; limits applying over the full Ambient Operating
Temperature range are denoted by a “•”. Minimum and Maximum limits are guaranteed through test, design, or statistical
correlation. Typical values represent the most likely parametric norm at TA = 25°C, and are provided for reference purposes
only. Unless otherwise indicated, VIN = VEN = 12V, VOUT=3.3V.
Parameter
Shutdown Supply Current
Quiescent Current
Feedback Voltage VFB
Feedback Overvoltage Threshold
Feedback Bias Current
Error Amplifier Voltage Gain AEA 1
Error Amplifier
Transconductance GEA
COMP to Current Sense
Transconductance GCS
High-Side switch On Resistance
RDSONH2
Low-Side switch On Resistance
RDSONL2
High-Side switch Leakage
Current
High-Side Switch Current Limit
Low-Side Switch Current Limit
Oscillator Frequency FOSC1
Short Circuit Oscillator
Frequency FOSC2
Maximum Duty Cycle DMAX
Minimum Duty Cycle DMIN
Minimum Start-up Current
Minimum No Load Start-up
Voltage
Minimum Full Load Start-up
Voltage
Min.
0.907
-0.1
2.7
280
Typ.
0.1
1.2
0.925
1.1
400
800
3.5
100
100
0.1
3.5
0
340
90
90
10
5
4.75
Max.
10
1.4
0.943
0.1
10
400
0
Units
µA
mA
V
V
µA
V/V
µA/V
A/V
mΩ
mΩ
µA
A
A
kHz
kHz
%
%
mA
V
V
Conditions
VEN=0V
VEN=3V, VFB=1V
VFB=1V
ISW=0.2A&0.7A
ISW=-0.2A&-0.7A
VIN=18V, VEN=0V, VSW=0V
Drain to Source
VFB=0.85V
VFB=1V
VIN≤4.75V
IOUT=0A
IOUT=2A
© 2013 Exar Corporation
2/12
Rev. 1.0.0


Part Number XRP7674
Description 2A 18V Synchronous PFM/PWM Step-Down Regulator
Maker Exar
Total Page 12 Pages
PDF Download

XRP7674 Datasheet PDF

View PDF for Mobile








Similar Datasheet

1 XRP7674 2A 18V Synchronous PFM/PWM Step-Down Regulator
Exar
2 XRP7675 3A 18V Synchronous PFM/PWM Step-Down Regulator
Exar





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