XR77129 Datasheet | Exar

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 105k Hz to 1.23MHz independent channel to channel programmable constant operating frequency, the XR77129 reduces overall ponent count, solution footprint and optimizes conversion efficiencies. A selectable digital Pulse Frequency Mode (PFM) capable of better than 80% efficiency at light current load and low operating current allow for portable and Energy Star pliant applications. Each XR77129 channel’s output voltage is individually programmable down to 0.6V with a resolution of 2.5m V, 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-pliant 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-Current and Under-Voltage Lockout protections insure safe operation under abnormal operating conditions. The XR77129 is offered in a Ro HS pliant, “green”/halogen free 44-pin TQFN package. Features - Quad Channel Step-down Controller  Digital PWM 105k Hz-1.23MHz Operation  Individual Channel Frequency Selection  Patented digital PFM with Ultrasonic mode  Patented Over Sampling Feedback  Programmable 5 coefficient PID control  Integrated MOSFET Drivers - 6V to 40V Input Voltage - 0.6V to 5.5V Output Voltage (higher with exter- nal feedback resistors) - SMBus pliant I2C Interface - Full Power Monitoring and Reporting - 3 x 15V Capable PSIO + 2 x GPIOs - Full Start/Stop Sequencing Support - Built-in Thermal, Over-Current, UVLO and Out- put Over-Voltage Protections - On...