TPS7A4700RGWR
36 V, 1 A ultra-low-noise LDO with 4 microvolt RMS noise and user-programmable output in a 20-pin VQFN.
The TPS7A4700RGWR is a Texas Instruments ultra-low-noise low-dropout linear regulator that delivers up to 1 amp from an input as high as 36 volts with an output noise of only a few microvolts RMS, in a 20-pin VQFN package. Its output voltage is user-programmable up to about 20.5 volts using the ANY-OUT configuration, which sets the output by connecting pins rather than by an external resistor divider, so no divider noise or error is added. That combination of high input voltage, high current, very low noise and no external feedback divider makes the part ideal for the quiet analog and RF rails that precision converters, amplifiers and radios depend on. A switching converter can supply the main rail efficiently, and this LDO then cleans it for the sensitive circuits, removing the switching ripple that would otherwise corrupt a measurement. The high power-supply rejection ratio keeps the input ripple from reaching the output across the frequency range that matters. The part suits instrumentation, test equipment, RF systems and precision data acquisition. Every device is factory-traceable and ships with an import declaration, a certificate of origin and RoHS documentation. BeiLuo holds this part in regional stock and our FAE team supports rail planning, layout and thermal design.
FAE Professional Review
This is the LDO we recommend when a rail must be genuinely quiet. The noise is low enough for precision converters and RF, and the ANY-OUT configuration removes the external divider that would otherwise add noise and error. Pair it with a switching converter for the main rail and use this for the analog or RF rail. Budget the thermal design, because an LDO dissipates the voltage drop times the current.
| Parameter | Value |
|---|---|
| Type | Ultra-low-noise LDO |
| Vin | 3 to 36 V |
| Iout | 1 A |
| Vout | 1.4 to 20.5 V (ANY-OUT) |
| Package | VQFN-20 |
Application Circuits
Precision analog and RF rails
Reference circuits and application schematics for Precision analog and RF rails are available from our FAE team.
Instrumentation and test equipment
Reference circuits and application schematics for Instrumentation and test equipment are available from our FAE team.
Data-acquisition front ends
Reference circuits and application schematics for Data-acquisition front ends are available from our FAE team.
Radio and communications supplies
Reference circuits and application schematics for Radio and communications supplies are available from our FAE team.
Post-regulation of switching rails
Reference circuits and application schematics for Post-regulation of switching rails are available from our FAE team.
Need a reference schematic or design review? Our FAE engineers can share verified circuits and layout guidance for this part.
Related Documents
Alternative Part Numbers
| Model | Package | Note | Action |
|---|---|---|---|
| TPS54331DDAR | SOIC-8 PowerPAD | Step-down converter for efficient main rails | View |
Complementary Part Numbers
| Model | Package | Note | Action |
|---|---|---|---|
| OPA1612AID | SOIC-8 | Low-distortion amplifier for a clean analog rail | View |
Recommended Complementary Products
Frequently Asked Questions
How is the output voltage set?
The ANY-OUT configuration sets the output by connecting the appropriate pins, with no external feedback divider. That removes divider noise and error from the rail.
Confirm the pin configuration for your target voltage.
How much heat does it dissipate?
An LDO dissipates the input-to-output voltage drop times the load current, so a large drop at high current produces significant heat. Use the thermal pad and copper area, and calculate the junction temperature.
Where the drop is large, a switching converter is more efficient.