DESCRIPTION

The MPQ8633A is a fully integrated, highfrequency, synchronous buck converter. It offers a very compact solution to achieve up to 12A output current over a wide input supply range with excellent load and line regulation. The MPQ8633A operates at high efficiency over a wide output current load range.

The MPQ8633A adopts internally compensated constant-on-time (COT) control mode that provides fast transient response and eases loop stabilization.

The operating frequency is set easily to 600kHz, 800kHz, or 1000kHz with the MODE configuration, allowing the MPQ8633A frequency to remain constant regardless of the input/output voltages.

The output voltage start-up ramp is controlled by an internal 1ms timer. It can be increased by adding a capacitor on TRK/REF. An open-drain power good(PGOOD) signal indicates the output is within its nominal voltage range. The PGOOD is clamped to around 0.7V with external pull-up voltage when the input supply fails to power the MPQ8633A.

Fully integrated protection features include overcurrent protection (OCP), over-voltage protection (OVP), under-voltage protection (UVP), and overtemperature protection (OTP).

The MPQ8633A requires a minimum number of readily available, standard, external components and is available in a QFN 3mm x 4mm package.

FEATURES

• Wide Input Voltage Range from 2.7V:

o 2.7V to 16V with External 3.3V VCC Bias

o 4 V to 16V with Internal Bias or External 3.3V VCC Bias

• Differential Output Voltage Remote Sense

• Programmable Accurate Current Limit Level

• 12A Output Current

• Low RDS(ON) Integrated Power MOSFETs

• Proprietary Switching Loss Reduction Technique

• Adaptive COT for Ultrafast Transient Response

• Stable with Zero ESR Output Capacitor

• 0.5% Reference Voltage over 0℃ to +70℃ Junction Temperature Range

• 1% Reference Voltage from -40℃ to +125℃ Junction Temperature Range

• Selectable Pulse Skip or Forced CCM Operation

• Excellent Load Regulation

• Output Voltage Tracking

• Output Voltage Discharge

• PGOOD Active Clamped Low Level during Power Failure

• Programmable Soft-Start Time from 1ms

• Pre-Bias Start-Up

• Selectable Switching Frequency from 600kHz, 800kHz, and 1000kHz

• Non-Latch OCP, UVP, UVLO, Thermal Shutdown, and Latch-Off for OVP.

• Output Adjustable from 0.6V to 90%*Vin, up to 5.5V Max.

• Available in a QFN 3mm x 4mm Package

APPLICATIONS

• Telecom and Networking Systems

• Server, Cloud-Computing, Storage

• Base Stations

• General Purpose Point-of-Load (PoL)

• 12V Distribution Power Systems

• High-end TV

• Game Consoles and Graphic Cards