Summary of ADG5401F SPST SWITCH HAS LOW ON RESISTANCE
Analog Devices ADG5401F is an SPST low on-resistance switch with built-in overvoltage and power-off protection, overvoltage detection on the source pin, and a protected 1 kΩ feedback channel for DAC or amplifier outputs. It blocks ±60 V at the source when powered or unpowered, signals faults via a fault flag pin, and can pull the source to ground at power-on to avoid output glitches. The device supports 1.8 V logic inputs, conducts bidirectionally, and prevents fault current from shunting to supplies for stable, known outputs in all conditions.
Parts used in the ADG5401F Fault Protection, SPST Switch Project:
- Analog Devices ADG5401F SPST switch (3 mm x 2 mm LFCSP)
- VDD supply (device operating positive supply)
- VSS supply (device operating negative supply or ground)
- S source pin (protected analog input)
- D drain pin (switch output)
- DFB feedback channel (integrated 1 kΩ feedback loop)
- FF fault flag pin (logic output indicating fault)
- Digital logic control input (Logic 1 to turn switch on; 1.8 V logic compatible)
- Ground connection (for POC power-on condition)
Analog Devices’ ADG5401F Fault Protection,10 Ω Ron, SPST Switch With 1 KΩ Feedback Channel
ADI’s ADG5401F is a single-pole/single-throw (SPST) low on-resistance switch that features overvoltage protection, power-off protection, and overvoltage detection on the source pin. The ADG5401F also features a protected feedback channel for use with digital to analog converter or amplifier outputs.
When no power supplies are present, the switch remains in the off condition, and the switch inputs are high impedance. When powered, if the analog input signal levels on the S pin exceed VDD or VSS by a threshold voltage (VT), the switch turns off, the normally high fault flag (FF) pin drops to a logic low, and a high resistance path between D and DFB is switched on to prevent an open-loop condition on an amplifier output. Input signal levels up to +60 V or -60 V relative to ground are blocked in both the powered and unpowered condition. The selectable POC function allows the protected switch terminal, S, to be driven to GND to prevent glitches on the output. The switch turns on with a Logic 1 input and conducts equally well in both directions. The digital input is compatible with 1.8 V logic inputs over the full operating supply range.
Features
- 3 mm x 2 mm LFCSP analog I/O protection and detection solution
- Overvoltage protection up to ±60 V on source pins
- Power-off protection up to ±60 V on source pins
- Overvoltage detection on source pins
- Integrated 1 kΩ feedback loop for outputs
- Fault propagation eliminated from supply/signal path
- No current shunted to supplies during fault condition
- Removes fault power dissipation
- Known and stable output under all conditions
- User enabled power-on condition pulls source to 0 V
- Known state without digital inputs present
Read more: ADG5401F SPST SWITCH HAS LOW ON RESISTANCE
- What protection does the ADG5401F provide on the source pin?
The ADG5401F provides overvoltage protection, overvoltage detection, and power-off protection on the source pin up to ±60 V. - Can the ADG5401F block high voltages when unpowered?
Yes, input signal levels up to ±60 V relative to ground are blocked in both the powered and unpowered condition. - How does the device indicate a fault?
On detecting a fault the fault flag pin FF drops from logic high to logic low to indicate the fault. - What prevents an amplifier output from going open-loop during a fault?
The device switches on a high resistance path between D and DFB using the integrated 1 kΩ feedback loop to prevent an open-loop condition. - Does the ADG5401F conduct in both directions?
Yes, the switch conducts equally well in both directions when on. - What logic levels does the digital input accept?
The digital input is compatible with 1.8 V logic inputs over the full operating supply range. - What is the purpose of the POC function?
The selectable power-on condition (POC) allows the protected source terminal S to be driven to ground to prevent output glitches at power-up. - Does a fault condition shunt current to the supplies?
No, fault propagation is eliminated from the supply and signal path and no current is shunted to the supplies during a fault. - What package is the ADG5401F available in?
The ADG5401F is available in a 3 mm x 2 mm LFCSP package.
