Packaging information
| Package | Pins WSON (DSC) | 10 |
| Operating temperature range (°C) -40 to 125 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the TPS7A39
- Positive and negative LDOs in one package
- Wide input voltage range: ±3.3V to ±33V
- Wide output voltage range:
- Positive range: 1.2V to 30V
- Negative range: –30V to 0V
- Output current: 150mA per channel
- Monotonic start-up tracking
- High power-supply rejection ratio (PSRR):
- 69dB (120Hz)
- ≥ 50dB (10Hz to 2MHz)
- Output voltage noise: 21µVRMS (10Hz–100kHz)
- Buffered 1.2V reference output
- Stable with a 10µF or larger output capacitor
- Single positive-logic enable
- Adjustable soft-start in-rush control
- 3mm × 3mm, 10-pin WSON package
- Low thermal resistance: RθJA = 44.4°C/W
- Operating temperature range: –40°C to +125°C
Description for the TPS7A39
The TPS7A39 is a dual, monolithic, high-PSRR, positive and negative low-dropout (LDO) voltage regulator capable of sourcing (and sinking) up to 150mA of current. The regulated outputs can be independently and externally adjusted to symmetrical or asymmetrical voltages, making this device a good choice to provide dual, bipolar power supply for signal conditioning.
Both positive and negative outputs of the TPS7A39 ratiometrically track each other during start-up to mitigate floating conditions and other power-supply sequencing issues common in dual-rail systems. The negative output can regulate up to 0V, extending the common-mode range for single-supply amplifiers. The TPS7A39 also features high PSRR to eliminate power-supply noise, such as switching noise, that can compromise signal integrity.
Both regulators are controlled with a single positive logic enable pin for interfacing with standard digital logic. A capacitor-programmable soft-start function controls in-rush current and start-up time. The internal reference voltage of the TPS7A39 can be overridden with an external reference to enable precision outputs, output voltage margining, or to track other power supplies. Additionally, the TPS7A39 has a buffered reference output that can be used as a voltage reference for other components in the system.
These features make the TPS7A39 a robust, simplified solution to power operational amplifiers, digital-to-analog converters (DACs), and other precision analog circuitry.