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Exar - 15A Synchronous Step Down COT Regulator

Numéro de référence XR76115
Description 15A Synchronous Step Down COT Regulator
Fabricant Exar 
Logo Exar 





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XR76115 fiche technique
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
VIN (V)
20
Figure 2: XR76115 line regulation
©2015 Exar Corporation
www.exar.com
Rev 1B

PagesPages 16
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