Overview
The TPS7A87, produced by Texas Instruments, is a dual, low-noise, low-dropout (LDO) voltage regulator. This component is designed to source up to 500 mA per channel, with a maximum dropout voltage of 100 mV. It features two independent LDO channels, each adjustable with external resistors from 0.8 V to 5.2 V. The device is optimized for low output noise of 3.8 µVRMS (10 Hz–100 kHz) and high power-supply ripple rejection (PSRR), making it ideal for powering sensitive analog and low-voltage devices.
The TPS7A87 operates over a wide input voltage range of 1.4 V to 6.5 V and maintains a high output voltage accuracy of 1% over line, load, and temperature. It also includes features such as adjustable start-up in-rush control, selectable soft-start charging current, and independent open-drain power-good outputs. The device is packaged in a 4-mm × 4-mm, 20-pin WQFN package, providing a compact solution for various applications.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Input Supply Voltage Range (VINx) | 1.4 | 6.5 | V |
| Output Voltage Range (VOUTx) | 0.8 - 1% | 5.2 + 1% | V |
| Output Current (IOUTx) | 0 | 500 | mA |
| Input Capacitor (CINx) | 10 | - | µF |
| Output Capacitor (COUTx) | 10 | - | µF |
| Noise-Reduction Capacitor (CNR/SSx) | 1 | - | µF |
| Junction Temperature Range (TJ) | -40 | 125 | °C |
| Junction-to-Ambient Thermal Resistance (RθJA) | - | 33 | °C/W |
Key Features
- Low Output Noise: 3.8 µVRMS (10 Hz–100 kHz)
- Low Dropout: 100 mVMAX at 0.5 A
- Wide Input Voltage Range: 1.4 V to 6.5 V
- Wide Output Voltage Range: 0.8 V to 5.2 V
- High Power-Supply Ripple Rejection (PSRR): 75 dB at DC, 40 dB at 100 kHz, and 40 dB at 1 MHz
- 1% Accuracy Over Line, Load, and Temperature
- Excellent Load Transient Response
- Adjustable Start-Up In-Rush Control
- Selectable Soft-Start Charging Current
- Independent Open-Drain Power-Good (PGx) Outputs
- Stable with a 10 µF or Larger Ceramic Output Capacitor
- Compact 4-mm × 4-mm, 20-Pin WQFN Package
Applications
- High-Speed Analog Circuits: VCOs, ADCs, DACs, LVDSs
- Imaging: CMOS Sensors, Video ASICs
- Test and Measurement
- Instrumentation and Medical
- Professional Audio
- High-Speed Communication Applications
Q & A
- What is the maximum output current per channel of the TPS7A87?
The TPS7A87 can source up to 500 mA per channel.
- What is the input voltage range of the TPS7A87?
The input voltage range is from 1.4 V to 6.5 V.
- What is the output voltage range of the TPS7A87?
The output voltage range is from 0.8 V to 5.2 V.
- What is the output noise of the TPS7A87?
The output noise is 3.8 µVRMS (10 Hz–100 kHz).
- What is the dropout voltage of the TPS7A87 at 0.5 A?
The maximum dropout voltage is 100 mV at 0.5 A.
- What is the power-supply ripple rejection (PSRR) of the TPS7A87?
The PSRR is 75 dB at DC, 40 dB at 100 kHz, and 40 dB at 1 MHz.
- Does the TPS7A87 have adjustable start-up in-rush control?
- What type of package does the TPS7A87 come in?
The TPS7A87 is packaged in a 4-mm × 4-mm, 20-pin WQFN package.
- What are some typical applications of the TPS7A87?
Typical applications include high-speed analog circuits, imaging, test and measurement, instrumentation and medical, professional audio, and high-speed communication.
- How accurate is the output voltage of the TPS7A87 over line, load, and temperature?
The output voltage accuracy is 1% over line, load, and temperature.
