XRP6124 Datasheet, PDF (1/12 Pages) Exar Corporation – Non-Synchronous PFET Step-Down Controller

January 2011
XRP6124
Non-Synchronous PFET Step-Down Controller
Rev. 1.1.0
GENERAL DESCRIPTION
The XRP6124 is a non synchronous step down
(buck) controller for up to 5Amps point of
loads. A wide 3V to 30V input voltage range
allows for single supply operations from
industry standard 3.3V, 5V, 12V and 24V
power rails.
With a proprietary Constant On-Time (COT)
control scheme, the XRP6124 provides
extremely fast line and load transient response
while the operating frequency remains nearly
constant. It requires no loop compensation
hence simplifying circuit implementation and
reducing overall component count. The
XRP76124 also implements an emulated ESR
circuitry allowing usage of ceramic output
capacitors and insuring stable operations
without the use of extra external components.
Built-in soft start prevents high inrush currents
while under voltage lock-out and output short
protections insure safe operations under
abnormal operating conditions.
The XRP6124 is available in a RoHS compliant,
green/halogen free space-saving 5-pin SOT23
package.
TYPICAL APPLICATION DIAGRAM
APPLICATIONS
• Point of Load Conversions
• Audio-Video Equipments
• Industrial and Medical Equipments
• Distributed Power Architecture
FEATURES
• 5A Point-of-Load Capable
− Down to 1.2V Output Voltage Conversion
• Wide Input Voltage Range
− 3V to 18V: XRP6124
− 4.5V to 30V: XRP6124HV
• Constant On-Time Operations
− Constant Frequency Operations
− No External Compensation
− Supports Ceramic Output Capacitors
• Built-in 2ms Soft Start
• Short Circuit Protection
• <1µA shutdown current
• RoHS Compliant, Green/Halogen Free
5-pin SOT23 Package
Figure 1: XRP6124 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]