XR77129 Datasheet, PDF(1/28 Page) Exar Corporation – 40V Quad Output Digital PWM/PFM

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XR77129 Datasheet, PDF (1/28 Pages) Exar Corporation – 40V Quad Output Digital PWM/PFM

XR77129

40V Quad Output Digital PWM/PFM

Universal PMIC

General Description

The XR77129 is a quad channel digital Pulse Width Modulated (PWM)

step down (buck) controller. A wide 6V to 40V 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 XR77129 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 XR77129 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 XR77129 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 XR77129 is offered in a RoHS compliant, âgreenâ/halogen free 44-pin

TQFN package.

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® 6V to 40V 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

Typical Application

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exar.com/XR77129

Rev 1A

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