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The RT7220E is a Synchronous Rectifier (SR) controller for Asymmetrical Half-Bridge (AHB) converters operating in Critical Conduction Mode (CRM), Cycle Skipping Mode (CSM), and Burst Mode (BM). The RT7220E detects the drain voltage of the MOSFET to control the on/off state of the SR gate. This functionality is intended to minimize turn-off dead-time and deliver sine-wave energy through the SR gate pulses, enhancing efficiency.The RT7220E supports a wide output voltage range from 5V to 48V, and a HV LDO is built-in for the MOSFET gate driver at low output voltage. When used with the AHB controller RT7795, the double pulses function can be enabled to optimize efficiency at heavy load/low output voltage.Furthermore, the RT7220E provides green mode operation under light load conditions, reducing operation current to below 160μA.The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 105°C.

Applications

  • USB PD Power Converters
  • Fast-Charger Power Adapters
  • General Purpose High-Efficiency and/or Compact-Size AHB Power Converters
Key Spec.
RT7220E
Status Active
Turn-On Threshold (V) 3.25
Turn-Off Threshold (V) 2.8
Operating Current (mA) 0.9
Green Mode Current (uA) 120
Maximum Input Voltage (V) 48
Maximum Operation Frequency (kHz) 250
Maximum VD Rating (DC Continue) (V) 180
Maximum VD Rating (Pulse width 500ns) (V) 180
HV LDO Current Capability (mA) 77
VG Total Turn-Off Delay Less than (ns) 50
Features Built-in HV LDO;Cycle-by-Cycle Current Limit;Green Mode;UVLO;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Output High Clamping
Package Type SOP-8
Features
  • Suitable for Low-Side SR Control of AHB in CRM, CSM and BM
  • Suitable for 5V to 48V VOUT Range
  • Double Pulses Function to Optimize Efficiency (Works with the AHB Controller RT7795)
  • <1.2mA Operating Current in Normal Mode
  • <160μA Operating Current in Green Mode
  • Built-In HV LDO to Supply SR Driver when VVDD is Lower than 4.5V
  • Automatic Dead-Time Tracking Control to Optimize Efficiency
  • Protection
    - SR Gate Driver with 8V Clamp
    - SR Gate Initial Pull-Low before Start-Up
    - SR Minimum On-Time
Please confirm with our distributor or sales representative for actual stock status.
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