Not Recommended for New Designs XR77128 (Suggested Alternate: XRP7714) Quad Output Digital PWM/PFM Universal PMIC FEATURES General Description Quad Channel Step-down Controller Digital PWM 105kHz-1.23MHz Operation The XR77128 is a quad channel digital Pulse Width Modulated (PWM) Individual Channel Frequency Selection 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 Patented digital PFM with Ultrasonic mode rails. Patented Over Sampling Feedback Programmable 5 coefficient PID control With integrated FET gate drivers, two LDOs for standby power and a Integrated MOSFET Drivers 105kHz to 1.23MHz independent channel to channel programmable Supports DrMOS devices constant operating frequency, the XR77128 reduces overall component 4.75V to 5.5V and 5.5V to 25V Input Voltage count, solution footprint and optimizes conversion efficiencies. A selectable digital Pulse Frequency Mode (PFM) capable of better than 0.6V to 5.5V Output Voltage (higher with external feedback resistors) 80% efficiency at light current load and low operating current allow for 2 portable and Energy Star compliant applications. Each XR77128 SMBus Compliant I C Interface channels output voltage is individually programmable down to 0.6V with a Full Power Monitoring and Reporting resolution of 2.5mV, and is configurable for precise soft start and soft stop 3 x 15V Capable PSIO + 2 x GPIOs sequencing, including delay and ramp control. Full Start/Stop Sequencing Support 2 Built-in Thermal, Over-Current, UVLO and The XR77128 operations are fully controlled via a SMBus-compliant I C Output Over-Voltage Protections interface allowing for advanced local and/or remote reconfiguration, full On Board 5V and LDOOUT Standby LDOs performance monitoring and reporting as well as fault handling. On Board Non-Volatile Memory Built-in independent output Over-Voltage, Over-Temperature, Over- Supported by PowerArchitect (PA5) Current and Under-Voltage Lockout protections insure safe operation under abnormal operating conditions. APPLICATIONS Industrial Control Systems The XR77128 is offered in a RoHS compliant, green/halogen free 44-pin Automatic Test Equipment TQFN package. Video Surveillance Systems Automotive Infotainment Ordering Information back page Typical Application 1 / 29 exar.com/XR77128 Rev 1CNot Recommended for New Designs XR77128 (Suggested Alternate: XRP7714) Absolute Maximum Ratings Operating Conditions Input Voltage Range VCC.............................................5.5V to 25V Stresses beyond the limits listed below may cause permanent damage to the device. Exposure to any Input Voltage Range VCC = LDO5.............................4.75V to 5.5V Absolute Maximum Rating condition for extended periods VOUT1, 2, 3, 4.........................................................................5.5V may affect device reliability and lifetime. Junction Temperature Range................................-40C to +125C VCCD, LDO5, LDOOUT, GLx, VOUTx........................-0.3V to 7.0V JEDEC Thermal Resistance .........................................32C/W JA ENABLE, V5EXT.........................................................-0.3V to 7.0V GPIO0/1, SCL, SDA.................................................................6.0V PSIO Inputs, BFB......................................................................18V DVDD, AVDD...........................................................................2.0V VCC..........................................................................................28V LX .................................................................................-1V to 28V BSTx, GHx........................................................................VLx + 6V Storage Temperature.............................................-65C to +150C Power Dissipation................................................Internally Limited Lead Temperature (Soldering, 10 sec)..................................300C ESD Rating (HBM - Human Body Model).................................2kV Electrical Characteristics Unless otherwise noted: T = 25C, VCC = 5.5V to 25V, V5EXT open. Limits applying over the full operating temperature J range are denoted by a Symbol Parameter Conditions Min Typ Max Units Quiescent Current I VCC Supply Current SHUTDOWN 10 20 A SUPPLY EN = 0V, VCC = 12V STANDBY 550 650 A I/Os programmed as inputs, VCC = 12V, EN = 5V 2ch PFM 3.1 mA 2 channels on set at 5V, VOUT forced to 5.1V, no load, non-switching, ultra-sonic 2 off, VCC = 12V, no I C activity 4ch PFM 4.0 mA 4 channels on set at 5V, VOUT forced to 5.1V, no load, non-switching, ultra-sonic 2 off, VCC = 12V, no I C activity 4ch PWM 18 mA All channels enabled, f = 600kHz, gate sw 2 drivers unloaded, no I C activity 2 / 29 exar.com/XR77128 Rev 1C