XR77128 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 con- Supports DrMOS devices stant 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 select- able digital Pulse Frequency Mode (PFM) capable of better than 80% effi- 0.6V to 5.5V Output Voltage (higher with exter- nal feedback resistors) ciency at light current load and low operating current allow for portable 2 and Energy Star compliant applications. Each XR77128 channels output SMBus Compliant I C Interface voltage is individually programmable down to 0.6V with a resolution of Full Power Monitoring and Reporting 2.5mV, and is configurable for precise soft start and soft stop sequencing, 3 x 15V Capable PSIO + 2 x GPIOs including delay and ramp control. Full Start/Stop Sequencing Support 2 Built-in Thermal, Over-Current, UVLO and Out- The XR77128 operations are fully controlled via a SMBus-compliant I C put 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-Cur- Supported by PowerArchitect 5.2 or later rent 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 2014 Exar Corporation 1 / 28 exar.com/XR77128 Rev 1AXR77128 Absolute Maximum Ratings Operating Conditions Input Voltage Range VCC.............................................5.5V to 25V Stresses beyond the limits listed below may cause perma- nent damage to the device. Exposure to any Absolute Max- Input Voltage Range VCC = LDO5.............................4.75V to 5.5V imum Rating condition for extended periods may affect VOUT1, 2, 3, 4.........................................................................5.5V 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 2014 Exar Corporation 2 / 28 exar.com/XR77128 Rev 1A