© 2015 Exar Corporation

XR79110

22V, 10A Synchronous Step Down COT Power Module

exar.com/XR79110

Rev 2A

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General Description

The XR79110 is a 10A synchronous step-down Power Module for point-of

load supplies. 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) con-

trol scheme, the XR79110 provides extremely fast line and load transient

response using ceramic output capacitors. It requires no loop compensa-

tion hence simplifying circuit implementation and reducing overall compo-

nent count. The control loop also provides 0.35% load and 0.1% 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. With a 96% peak efficiency and 90% for loads as low as

100mA, the XR79110 is suitable for applications where low power losses

are important.

A host of protection features, including over-current, over-temperature,

short-circuit and UVLO, help achieve safe operation under abnormal

operating conditions.

The XR79110 is available in a RoHS compliant, green/halogen free

space-saving 72-pin 10x10x4mm QFN package with a 260°C lead solder

temperature. With integrated controller, drivers, bootstrap diode and

capacitor, MOSFETs, inductor, CIN and COUT, this solution allows the

smallest possible 10A POL design

.

FEATURES



Controller, drivers, bootstrap diode and capaci-

tor, MOSFETs, Inductor, CIN and COUT integrated

in one package



10A Step Down Module



Wide 4.5V to 22V Input Voltage Range





Proprietary Constant On-Time Control



No Loop Compensation Required



Stable Ceramic Output Capacitor Operation



Programmable 200ns to 2μs On-Time



Constant 400kHz to 600kHz Frequency



Selectable CCM or CCM/DCM



CCM/DCM for high efficiency at light-load



CCM for constant frequency at light-load



Programmable Hiccup Current Limit with Ther-

mal Compensation



Precision Enable and Power Good flag



Programmable Soft-start



72-pin 10x10x4mm QFN package 260°C solder

temperature

APPLICATIONS



Networking and Communications



Fast Transient Point-of-Loads



Industrial and Medical Equipment



Embedded High Power FPGA

Ordering Information – back page

Typical Application

1.180

1.185

1.190

1.195

1.200

1.205

1.210

1.215

1.220

4

6

8 1012 1416 182022

PGND

FB

ILIM

SW

XR79110

VIN

EN/MODE

PGOOD

VCC

SS

TON

AGND

Enable/Mode

Power Good

R3

R1

R2

PVIN

VOUT

Line Regulation