XR79103 Datasheet, PDF (1/9 Pages) Exar Corporation – 22V, 3A Synchronous Step-Down COT Power Module

XR79103
22V, 3A Synchronous Step-Down COT Power Module
April 2016
GENERAL DESCRIPTION
The XR79103 is part of a family of 22V
synchronous step-down power modules
combining the controller, drivers, inductor,
passive components and MOSFETs in a single
package for point-of-load supplies. This
module requires very few external components
leading to ease of design and fast time to
market. The XR79103 has load current rating
of 3A. A wide 4.5V to 22V input voltage range
allows for single supply operation from
industry standard 5V, 12V and 19.6V rails.
With a proprietary emulated current mode
Constant On-Time (COT) control scheme, the
XR79103 provides extremely fast line and load
transient response using ceramic output
capacitors. It requires no loop compensation,
simplifying circuit implementation and
reducing overall component count. The control
loop also provides 0.2% load and 0.2% line
regulation and maintains constant operating
frequency. A selectable power saving mode,
allows the user to operate in Discontinuous
Current Mode (DCM) at light current loads,
significantly increasing the converter
efficiency. A host of protection features,
including overcurrent, over temperature,
short-circuit and UVLO, helps achieve safe
operation under abnormal operating
conditions. The XR79103 is available in a
RoHS-compliant, green/halogen-free space-
saving 6mm x 6mm x 4mm QFN package.
Rev. 1A
EVALUATION BOARD MANUAL
FEATURES
• 3A step-down power module
o 4.5V to 22V wide single input
voltage
o ≥0.6V adjustable output voltage
• Controller, drivers, inductor, passive
components and MOSFETs integrated in
one package
• Proprietary constant on-time control
o No loop compensation required
o Stable with ceramic output
capacitors
o Programmable 100ns to 1µs on-
time
o Constant 600kHz to 800kHz
frequency
o Selectable CCM or DCM/CCM
operation
• Precision enable and power-good flag
• Programmable soft-start
• 6mm x 6mm x 4mm QFN package
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
www.exar.com
Tel. [phone] – Fax. [phone]