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PDF XRP7674 Data sheet ( Hoja de datos )
| Número de pieza | XRP7674 | |
| Descripción | 2A 18V Synchronous PFM/PWM Step-Down Regulator | |
| Fabricantes | Exar | |
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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
1 page  
XRP7674
2A 18V Synchronous PFM/PWM Step-Down Regulator
TYPICAL PERFORMANCE CHARACTERISTICS
All data taken at VIN = 12V, VOUT=3.3V, TJ = TA = 25°C, unless otherwise specified - Schematic and BOM from Application
Information section of this datasheet.
Fig. 4: Efficiency versus output current
Fig. 5: Quiescent current versus temperature
Fig. 6: Feedback voltage versus temperature
Fig. 7: Output voltage versus load current
Fig. 8: Output voltage versus input voltage
Fig. 9: Minimum Start-Up Voltage vs Output Current
© 2013 Exar Corporation
5/12
Rev. 1.0.0
5 Page 
XRP7674
2A 18V Synchronous PFM/PWM Step-Down Regulator
PACKAGE SPECIFICATION
8-PIN SOIC
Unit: mm (inch)
© 2013 Exar Corporation
11/12
Rev. 1.0.0
11 Page | ||
| Páginas | Total 12 Páginas | |
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