XR76115 Datasheet, PDF (1/16 Pages) Exar Corporation – 15A Synchronous Step Down COT Regulator

XR76115
PowerBlox™
15A Synchronous Step Down COT Regulator
General Description
The XR76115 is a synchronous step-down regulator combining
the controller, drivers, bootstrap diode and MOSFETs in a single
package for point-of-load supplies. The XR76115 has a load
current rating of 15A. A wide 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 XR76115 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 0.25% load and 0.12% line regulation
and maintains constant operating frequency. A selectable power
saving mode, allows the user to operate in discontinuous mode
(DCM) at light current loads thereby significantly increasing the
converter efficiency.
A host of protection features, including over-current, over-
temperature, short-circuit and UVLO, help achieve safe
operation under abnormal operating conditions.
The XR76115 is available in a RoHS-compliant, green/halogen-
free space-saving QFN 6x6mm package.
Typical Application
Figure 1: XR76115 Application Diagram
FEATURES
• 15A Capable Step Down Regulator
− 4.5V to 5.5V Low VIN Operation
− 5V to 22V Wide Single Input Voltage
− ≥0.6V Adjustable Output Voltage
• Controller, drivers, bootstrap diode and
MOSFETs integrated in one package
• Proprietary Constant On-Time Control
− No Loop Compensation Required
− Ceramic Output Cap. Stable operation
− Programmable 200ns-2µs On-Time
− Quasi Constant 200kHz-800kHz Freq.
− Selectable CCM or CCM/DCM
Operation
• Precision Enable and Power-Good Flag
• Programmable Soft-start
• 6x6mm 37-pin QFN Package
APPLICATIONS
• Distributed Power Architecture
• Point-of-Load Converters
• Power Supply Modules
• FPGA, DSP, and Processor Supplies
• Base Stations, Switches/Routers, and
Servers
1.220
1.215
1.210
1.205
1.200
1.195
1.190
1.185
1.180
5
10
15
20
V_IN (V)
Figure 2: XR76115 line regulation
©2015 Exar Corporation
www.exar.com
Rev 1B