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RT7220A

Synchronous Rectifier Controller with Wide Output Voltage Operating Range

RT7220A
New

The RT7220A is a high performance Synchronous Rectifier (SR) controller for flyback converters operating in Continuous Conduction Mode (CCM), Discontinuous Conduction Mode (DCM) and Quasi-Resonant (QR) mode. This SR controller senses the drain voltage of MOSFET to determine SR gate on/off so as to minimize turn-off dead-time and enhance efficiency.

The RT7220A is designed to support a wide output voltage range of 3V to 22V, and an HV LDO is especially built-in for the MOSFET gate driver to operate at low output voltage.

Furthermore, the RT7220A offers a Green Mode operation, in light load condition, in which the RT7220A counts the gate pulse of MOSFET to determine the timing for entering green mode and to reduce operation current under 160μA.

The recommended junction temperature range is -40°C to 125°C, and the ambient temperature range is -40°C to 105°C.

Applications

  • Travel Adapters with Fast Charge Protocols (e.g., FCP, SCP, AFC and QC2.0/QC3.0)
  • Travel Adapters with USB PD Type-C Control
  • Netcom Adapters

Key Spec.

RT7220AHC RT7220AHD RT7220AHF RT7220AHJ RT7220AMD
Status Active Active Active Active Active
Turn-On Threshold (V) 3.25 3.25 3.25 3.25 3.25
Turn-Off Threshold (V) 2.8 2.8 2.8 2.8 2.8
Operating Current (mA) 1 1 1 1 1
Green Mode Current (uA) 120 120 120 120 120
Maximum Input Voltage (V) 22 22 22 22 22
Maximum Operation Frequency (kHz) 150 150 150 150 100
Maximum VD Rating (DC Continue) (V) 120 120 120 120 120
Maximum VD Rating (Pulse width 500ns) (V) 130 130 130 130 130
HV LDO Current Capability (mA) 65 65 65 65 65
VG Total Turn-Off Delay Less than (ns) 30 30 30 30 30
Features Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping Built-in HV LDO;Green Mode;High-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode+;Low-Side SR Controller Of Flyback in CCM;DCM and Quasi-Resonant Mode;VG Fast Turn-Off;VG Initial Output Low Clamping;VG Minimum Off-Time;VG Minimum On-Time;VG Output High Clamping
Package Type SOT-26 SOT-26 SOT-26 SOT-26 SOT-26

Features

  • Suitable for High/Low-Side SR Control of Flyback in CCM, DCM and Quasi-Resonant Mode

  • Suitable for 3V to 22V VOUT Range

  • <1.2mA Operating Current in Normal Mode (Without SR Driver)

  • <160μA Operating Current in Green Mode

  • Built-in HV LDO to Supply SR Driver when VOUT Lower than 5V

  • Automatic Tracking Control to Optimize Efficiency

  • 300kHz Maximum Operation Frequency

  • Protection
    ► SR Gate Driver with 6V Clamp
    ► SR Gate Initial Output Low Clamping Voltage before Start-Up
    ► Optional Minimum Period Protection
    ► Optional SR Minimum Off-Time
    ► VG Fast Turn-Off (The Total Delay is Less than 35ns)

Datasheet

DS7220A-07.pdf

Datasheet

DS7220A-07.pdf

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