Overview
The TPS78601KTTR is a part of the TPS786 family of ultralow-noise, high-PSRR (Power Supply Rejection Ratio), fast, and low-dropout linear voltage regulators from Texas Instruments. This device is designed to provide high performance in noise-sensitive applications, such as RF and audio systems. It is available in a TO-263 (DDPAK-5) package and features adjustable output voltage from 1.2 V to 5.5 V. The TPS78601KTTR is known for its extremely low dropout voltage, fast start-up time, and excellent line and load transient responses, making it suitable for a variety of applications requiring low noise and high stability.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage, VIN | VOUT + VDO or 2.7 V, whichever is greater | 2.7 | 5.5 | V | |
| Output Voltage Range | 0 μA ≤ IOUT ≤ 1.5 A, VOUT + 1 V ≤ VIN ≤ 5.5 V | 1.225 | 5.5 - VDO | V | |
| Continuous Output Current, IOUT | 0 | 1.5 | A | ||
| Dropout Voltage | IOUT = 1.5 A | 390 | 550 | mV | |
| Output Noise Voltage | IOUT = 1.5 A, CNR = 0.1 μF | 48 | μVRMS | ||
| Power-Supply Ripple Rejection | f = 10 kHz, IOUT = 1.5 A | 49 | dB | ||
| Start-Up Time | RL = 2 Ω, COUT = 1 μF, CNR = 0.01 μF | 110 | μs | ||
| Enable Input Voltage | High Level | 1.7 | VIN | V | |
| Enable Input Voltage | Low Level | 0 | 0.7 | V | |
| Shutdown Current | VEN = 0 V, 2.7 V ≤ VIN ≤ 5.5 V | 0.07 | 1 | μA |
Key Features
- Ultralow Noise: The TPS78601KTTR exhibits ultralow output noise, with approximately 48 μVRMS at 3 V output with a 0.1 μF bypass capacitor.
- High PSRR: High power-supply rejection ratio (PSRR) of up to 49 dB at 10 kHz.
- Fast Start-Up Time: Fast start-up time of approximately 50 μs with a 0.001 μF bypass capacitor.
- Low Dropout Voltage: Very low dropout voltage of 390 mV at full load (1.5 A).
- Stable Operation: Stable operation with a small 1 μF ceramic capacitor on the output.
- Low Quiescent Current: Low quiescent current of 265 μA, typical, and less than 1 μA in shutdown mode.
- Enable Input: Enable input to turn the regulator on or off, reducing supply currents to less than 1 μA when the regulator is turned off.
- Thermal and Current Protection: Internal current limiting and thermal protection to prevent device failure).
Applications
- RF Applications: Suitable for RF components such as VCOs, receivers, and ADCs due to its high PSRR and low noise characteristics).
- Audio Systems: Ideal for audio applications requiring low noise and high stability).
- Wireless Devices: Used in Bluetooth, Wireless LAN, cellular, and cordless telephones).
- Handheld Devices: Suitable for handheld organizers, PDAs, and other portable electronics).
Q & A
- What is the input voltage range for the TPS78601KTTR?
The input voltage range is from 2.7 V to 5.5 V).
- What is the maximum output current of the TPS78601KTTR?
The maximum output current is 1.5 A).
- What is the typical output noise voltage of the TPS78601KTTR?
The typical output noise voltage is approximately 48 μVRMS with a 0.1 μF bypass capacitor).
- What is the power-supply ripple rejection ratio (PSRR) of the TPS78601KTTR at 10 kHz?
The PSRR is up to 49 dB at 10 kHz).
- How long does the TPS78601KTTR take to start up?
The start-up time is approximately 50 μs with a 0.001 μF bypass capacitor).
- What is the dropout voltage of the TPS78601KTTR at full load?
The dropout voltage is 390 mV at full load (1.5 A)).
- What is the quiescent current of the TPS78601KTTR in normal operation?
The quiescent current is typically 265 μA).
- What is the shutdown current of the TPS78601KTTR?
The shutdown current is less than 1 μA when the regulator is turned off).
- Does the TPS78601KTTR have built-in protection features?
Yes, it has internal current limiting and thermal protection).
- What types of applications are the TPS78601KTTR suitable for?
It is suitable for RF, audio, wireless devices, and handheld electronics).
