XRP7675 Datasheet, PDF (1/12 Pages) Exar Corporation – 3A 18V Synchronous PFM/PWM Step-Down Regulator

XRP7 6 7 5
3 A 1 8 V Sy n ch r on ou s PFM/ PW M St ep - Dow n Reg u lat or
February 2013
GENERAL DESCRIPTION
The XRP 7675 is a 3A 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
10PŸ0PŸ 026), (7thVe XRP7675
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 .1µ A. At
light current loads, the XRP 7675 operates in
Discontinuous Conduction Mode ( DCM) and is
complemented by a pulse
frequency
modulation mode (P FM) 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 insure s safe
operation
under abnormal operating
conditions.
The XRP7675 is offered in a RoHS compliant,
³JUHHQ´KDOR-JpiHn QExpoIseUdHPHad SOIC
package .
APPLICATIONS
x Distributed Power Architecture
x Portable Equipment
x Point of Load Converter
xAudio - Video Equipment
Rev. 1.0.0
FEATURES
x3 A Continuous Output Current
x4. 5V to 18V Wide Input Voltage
0.925V to 16V Adjustable Output Voltage
 ±2% Output Voltage Accuracy
xPWM Curr ent - Mode Control
340kHz Constant Operations
Up to 9 5% Efficiency
xLight - Load E fficiency
Discontinuous Conduction Mode (DCM)
Pulse Frequency Modulation Mode (P FM)
x Programmable Soft
Function
- Start and Enable
xBuilt - in Thermal , Over - Current , UVLO,
Output Over - Voltage and hiccup mode
short - circuit protection
x 5R+6&RPSOLDQW³*UHHQ´+DOR
Free 8 - Pin Exposed Pad SOIC Package
TYPICAL APPLICATION DIAGRAM
Fig. 1: XRP7675 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] - 70 00 ±Fax. [phone] - 70 01