XR75100 Datasheet, PDF(1/15 Page) Exar Corporation – 40V Synchronous Step Down COT Controller

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XR75100 Datasheet, PDF (1/15 Pages) Exar Corporation – 40V Synchronous Step Down COT Controller

XR75100

40V Synchronous Step Down COT Controller

General Description

The XR75100 is a synchronous step-down controller for point-of load sup-

plies up to 20A. A wide 5.5V to 40V input voltage range allows for single

supply operation from industry standard 12V, 18V, and 24V DC and AC

rails.

With a proprietary emulated current mode Constant On-Time (COT) con-

trol scheme, the XR75100 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 exceptional load and 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 XR75100 is available in RoHS compliant, green/halogen free space-

saving 16-pin 3x3 QFN package.

FEATURES

ï® 20A Capable Step Down Controller

ï¯ Wide 5.5V to 40V Input Voltage Range

ï¯ Integrated High Current 2A/3A Drivers

ï¯ 0.6 to 30V Adjustable Output Voltage

ï® Proprietary Constant On-Time Control

ï¯ No Loop Compensation Required

ï¯ Stable Ceramic Output Capacitor Operation

ï¯ Programmable 200ns to 2Î¼s On-Time

ï¯ Constant 100kHz to 800kHz Frequency

ï¯ Selectable CCM or CCM/DCM Operation

ï® Programmable Hiccup Current Limit with Ther-

mal Compensation

ï® Precision Enable and Power Good flag

ï® Programmable Soft-start

ï® Integrated Bootstrap diode

ï® 16-pin QFN package

APPLICATIONS

ï® Networking and Communications

ï® Fast Transient Point-of-Loads

ï® Industrial and Medical Equipment

ï® Embedded High Power FPGA

Ordering Information â back page

Typical Application

VIN

Enable/Mode

Power Good

CIN

CBST

VIN

BST

EN/MODE

PGOOD

VCC XR75100 ILIM

RLIM

CVCC CSS

RON

TON

AGND

PGND

VOUT

Q2 CFF R1

COUT

3.340

3.330

3.320

3.310

3.300

3.290

3.280

3.270

3.260

+0.5%

Typical

-0.5%

VIN (V)

1 / 15

exar.com/XR75100

Rev 1C

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