X RP7 6 6 5
3 A 1 8 V S y n c h r o n o u s S t e p - D o w n Co n v e r t e r
March 2013
Rev. 2.0. 1
GENERAL DESCRIPTION
The X RP7665 is a synchronous current
- mode
PWM step down (buck) regulator capable of a
constant output current up to
3 Amps. A wide
4.5 0V 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
10
9
, the XRP 7665 reduces
the overall component count
and solution
footprint. Current - mode control provides fast
transient response and cycle
- by - cycle current
limit. An adjustable soft - start prevents inrush
current at turn - on, and in shutdown mode
the
supply current drops to 0.1µ
A.
Built - in output over volta ge (open load) , over
temperature , cycle - by - cycle over current
and
under voltage lockout (UVLO)
protections
insure safe operations under abnormal
operating conditions.
The XRP 7665 is a pin and func tion compatible
device to MP1484 and a 3A pin to pin upgrade
to XRP7664 .
The XRP 7665 is offered in a RoHS compliant,
- pin exposed pad SOIC
package .
APPLICATIONS
Distributed Power Architectures
Point of Load Converters
Audio - Video Equipments
Medical & Industrial Equipments
FEATURES
Pin/Functio
n Compatible to MP148
Output Current
Voltage
4
3 A Continuous
4. 50 V to 18V Wide Input
PWM Current Mode Control
340kHz Constant Operations
Up to 93% Efficiency
Adjustable Output Voltage
0.925V to 16V Range
2.0 % Accuracy
Programmable Soft
Function
- Start and Enable
Built - in Thermal , Over Current , UVLO
and Output Over Voltage
Protections
8 - Pin Exposed Pad
SOIC Package
TYPICAL APPLICATION
DIAGRAM
Fig. 1: XRP7665 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
Tel. +1 510 668
- 70 00
www.exar.com
Fax. +1 510 668 - 70 01
EXAR [ EXAR CORPORATION ]
