XR77128 Datasheet, PDF(1/28 Page) Exar Corporation

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XR77128 Datasheet, PDF (1/28 Pages) Exar Corporation – Quad Output Digital PWM/PFM

XR77128

Quad Output Digital PWM/PFM

Universal PMIC

General Description

The XR77128 is a quad channel digital Pulse Width Modulated (PWM)

step down (buck) controller. A wide 4.75V to 5.5V and 5.5V to 25V input

voltage range allows for single supply operation from standard power

rails.

With integrated FET gate drivers, two LDOs for standby power and a

105kHz to 1.23MHz independent channel to channel programmable con-

stant operating frequency, the XR77128 reduces overall component

count, solution footprint and optimizes conversion efficiencies. A select-

able digital Pulse Frequency Mode (PFM) capable of better than 80% effi-

ciency at light current load and low operating current allow for portable

and Energy Star compliant applications. Each XR77128 channelâs output

voltage is individually programmable down to 0.6V with a resolution of

2.5mV, and is configurable for precise soft start and soft stop sequencing,

including delay and ramp control.

The XR77128 operations are fully controlled via a SMBus-compliant I2C

interface allowing for advanced local and/or remote reconfiguration, full

performance monitoring and reporting as well as fault handling.

Built-in independent output Over-Voltage, Over-Temperature, Over-Cur-

rent and Under-Voltage Lockout protections insure safe operation under

abnormal operating conditions.

The XR77128 is offered in a RoHS compliant, âgreenâ/halogen free 44-pin

TQFN package.

Typical Application

FEATURES

ï® Quad Channel Step-down Controller

ï¯ Digital PWM 105kHz-1.23MHz Operation

ï¯ Individual Channel Frequency Selection

ï¯ Patented digital PFM with Ultrasonic mode

ï¯ Patented Over Sampling Feedback

ï¯ Programmable 5 coefficient PID control

ï¯ Integrated MOSFET Drivers

ï¯ Supports DrMOS devices

ï® 4.75V to 5.5V and 5.5V to 25V Input Voltage

ï® 0.6V to 5.5V Output Voltage (higher with exter-

nal feedback resistors)

ï® SMBus Compliant I2C Interface

ï® Full Power Monitoring and Reporting

ï® 3 x 15V Capable PSIO + 2 x GPIOs

ï® Full Start/Stop Sequencing Support

ï® Built-in Thermal, Over-Current, UVLO and Out-

put Over-Voltage Protections

ï® On Board 5V and LDOOUT Standby LDOs

ï® On Board Non-Volatile Memory

ï® Supported by PowerArchitectâ¢ 5.2 or later

APPLICATIONS

ï® Industrial Control Systems

ï® Automatic Test Equipment

ï® Video Surveillance Systems

ï® Automotive Infotainment

Ordering Information â back page

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exar.com/XR77128

Rev 1A

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