The TPS51621 is a selectable dual or single-phase, fully compliant IMVP-6.5 step down controller with integrated gate drivers. Advanced control features such as D-CAP+ architecture and OSR overshoot reduction provide fast transient response, and lowest output capacitance. The TPS51621 also supports single-phase operation for light loads. The full complement of IMVP-6.5 I/O is integrated into the TPS51621, including VR_TT, DPRSLPVR, PSI and output current monitoring (IMON). PSI is used to control the number of active phases. Transitioning into and out of dual-phase mode is exceptionally smooth.

Adjustable control of VCORE slew rate and voltage positioning round out the IMVP-6.5 features. In addition, the TPS51621 includes two high-current MOSFET gate drivers to drive high- and low-side N-channel MOSFETs with exceptionally high speed and low switching loss. The TPS51621 is packaged in a space saving, thermally enhanced 40-pin QFN and is rated to operate from -10°C to 105°C.

• Selectable Dual-or Single-Phase
• Selectable CPU or GPU Mode
• Minimum External Parts Count
• Full IMVP-6.5 Feature Set, Including VR_TT and Output Current Monitor (IMON)
• ±8 mV VCORE Accuracy Over Line/Load/Temp
• 7-Bit DAC
• Optimized Efficiency at Light and Heavy Loads
• Patented Output Overshoot Reduction (OSR) Reduces Output Capacitance
• Accurate, Adjustable Voltage Positioning
• Selectable 200/300/400/500 kHz Frequency
• Pat. Pending AutoBalance Phase Balancing
• Selectable 8-Level Current Limit
• 3-V to 28-V Conversion Voltage Range
• Fast MOSFET Driver w/Integrated Boost Diode
• Integrated Overvoltage Protection (OVP)
• Small 6 × 6, 40-Pin QFN PowerPAD Package
• APPLICATIONS
  • IMVP-6.5 VCORE Applications for Adapter, Battery, NVDC or 3 V/5 V/12 V Rails