Overview
The TPS7A4700RGWR is a part of the TPS7A47 family of positive voltage, ultralow-noise, low-dropout linear regulators (LDOs) designed by Texas Instruments. This device is capable of sourcing a 1-A load and is particularly suited for high-accuracy, high-precision instrumentation applications. The TPS7A4700RGWR features a user-programmable output voltage range of +1.4 V to +20.5 V using a printed circuit board (PCB) layout, eliminating the need for external resistors or feed-forward capacitors. This design reduces the overall component count and enhances system performance by providing clean voltage rails essential for powering operational amplifiers, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and other high-performance analog circuitry.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | +3 V to +36 V |
| Output Voltage Range | +1.4 V to +20.5 V (user-programmable), +1.4 V to +34 V (adjustable with external feedback) |
| Output Current | 1 A |
| Dropout Voltage | 307 mV at 1 A |
| Output Voltage Noise | 4 µVRMS (10 Hz, 100 kHz) |
| Power-Supply Ripple Rejection | 82 dB (100 Hz), > 55 dB (10 Hz, 10 MHz) |
| Operating Temperature Range | -40°C to 125°C |
| Package Type | 20-pin VQFN (RGW) |
| Thermal Shutdown Temperature | 170°C |
Key Features
- User-programmable output voltage using PCB layout (up to 20.5 V) without external resistors or feed-forward capacitors
- Adjustable output voltage (up to 34 V) with external feedback resistors (TPS7A4701 only)
- Ultralow-noise output: 4 µVRMS (10 Hz, 100 kHz)
- High power-supply ripple rejection: 82 dB (100 Hz), > 55 dB (10 Hz, 10 MHz)
- CMOS logic level-compatible enable pin
- Built-in fixed current limit and thermal shutdown
- Available in high-performance thermal package: 5-mm × 5-mm QFN
Applications
The TPS7A4700RGWR is ideal for various high-precision and high-accuracy applications, including:
- Instrumentation: powering operational amplifiers, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), and other high-performance analog circuitry
- Medical applications: requiring clean and stable voltage rails
- Radio Frequency (RF) applications: to ensure minimal noise interference
- Test-and-measurement equipment: to provide stable and precise voltage rails
- Post dc-dc converter regulation: to filter out output voltage ripple inherent to dc-dc switching conversions
Q & A
- What is the input voltage range of the TPS7A4700RGWR?
The input voltage range is +3 V to +36 V
- What is the output current capability of the TPS7A4700RGWR?
The device can source up to 1 A of output current
- How is the output voltage programmed in the TPS7A4700RGWR?
The output voltage can be programmed using a PCB layout (up to 20.5 V) or adjusted with external feedback resistors (up to 34 V for TPS7A4701)
- What is the noise level of the TPS7A4700RGWR?
The output voltage noise is 4 µVRMS (10 Hz, 100 kHz)
- What is the power-supply ripple rejection of the TPS7A4700RGWR?
The power-supply ripple rejection is 82 dB (100 Hz) and > 55 dB (10 Hz, 10 MHz)
- What is the operating temperature range of the TPS7A4700RGWR?
The operating temperature range is -40°C to 125°C
- What type of package is the TPS7A4700RGWR available in?
The device is available in a 20-pin VQFN (RGW) package
- Does the TPS7A4700RGWR have built-in thermal protection?
Yes, it has built-in fixed current limit and thermal shutdown
- What are some typical applications for the TPS7A4700RGWR?
Typical applications include instrumentation, medical, RF, test-and-measurement, and post dc-dc converter regulation
- How does the TPS7A4700RGWR enhance system performance?
It enhances system performance by providing clean voltage rails, filtering out output voltage ripple, and offering high power-supply ripple rejection
