TPS7A39

WSON (DSC)

9 mm² 3 x 3

Positive and Negative LDOs in One Package
Wide Input Voltage Range: ±3.3 V to ±33 V
Wide Output Voltage Range:
- Positive Range: 1.2 V to 30 V
- Negative Range: –30 V to 0 V
Output Current: 150 mA per Channel
Monotonic Start-Up Tracking
High Power-Supply Rejection Ratio (PSRR):
- 69 dB (120 Hz)
- ≥ 50 dB (10 Hz to 2 MHz)
Output Voltage Noise: 21 µV_RMS (10 Hz–100 kHz)
Buffered 1.2-V Reference Output
Stable With a 10-µF or Larger Output Capacitor
Single Positive-Logic Enable
Adjustable Soft-Start In-Rush Control
3-mm × 3-mm, 10-Pin WSON Package
Low Thermal Resistance: R_θJA = 44.4°C/W
Operating Temperature Range: –40 to +125°C

Positive and Negative LDOs in One Package
Wide Input Voltage Range: ±3.3 V to ±33 V
Wide Output Voltage Range:
- Positive Range: 1.2 V to 30 V
- Negative Range: –30 V to 0 V
Output Current: 150 mA per Channel
Monotonic Start-Up Tracking
High Power-Supply Rejection Ratio (PSRR):
- 69 dB (120 Hz)
- ≥ 50 dB (10 Hz to 2 MHz)
Output Voltage Noise: 21 µV_RMS (10 Hz–100 kHz)
Buffered 1.2-V Reference Output
Stable With a 10-µF or Larger Output Capacitor
Single Positive-Logic Enable
Adjustable Soft-Start In-Rush Control
3-mm × 3-mm, 10-Pin WSON Package
Low Thermal Resistance: R_θJA = 44.4°C/W
Operating Temperature Range: –40 to +125°C

The TPS7A39 device is a dual, monolithic, high-PSRR, positive and negative low-dropout (LDO) voltage regulator capable of sourcing (and sinking) up to 150 mA of current. The regulated outputs can be independently and externally adjusted to symmetrical or asymmetrical voltages, making this device an ideal dual, bipolar power supply for signal conditioning.

Both positive and negative outputs of the TPS7A39 ratiometrically track each other during startup to mitigate floating conditions and other power-supply sequencing issues common in dual-rail systems. The negative output can regulate up to 0 V, 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.

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Technical documentation

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	Type	Title	Date
*	Data sheet	TPS7A39 Dual, 150-mA, Wide VIN Positive and Negative LDO Voltage Regulator datasheet (Rev. A)	15 Sep 2017
	Technical article	3 quiescent-current (Iq) specifications you need to understand	12 Nov 2021
	Application note	Powering a dual-supply op amp circuit with one LDO (Rev. A)	07 Mar 2019
	Technical article	Improving sensor DAQ performance using the PRU-ICSS for grid protection and control	09 Oct 2018
	Technical article	Interfacing multiple ADCs to a single processor for grid protection and control	13 Sep 2018
	Technical article	How to choose the right kind of DC/DC conversion for your appliance design	04 Dec 2017
	Application note	Dual Bipolar Power-Supply Considerations for Amplifiers	01 Aug 2017
	User guide	TPS7A39EVM-865 Evaluation Module User's Guide	20 Jul 2017

Design & development

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Evaluation board

TPS7A39EVM-865 — TPS7A39 Dual, 150mA, Wide-Vin, Positive and Negative LDO Voltage Regulator Evaluation Module

The TPS7A39EVM-865 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS7A39 150-mA tracking positive/negative low-dropout (LDO) voltage regulator.

The EVM circuit board is configured to be a reference design for engineering applications (...)

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User guide

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Simulation model

TPS7A3901 PSpice Transient Model (Rev. A)

SBVM711A.ZIP (53 KB) - PSpice Model

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Simulation model

TPS7A3901 Unencrypted PSpice Transient Model (Rev. A)

SBVM712A.ZIP (4 KB) - PSpice Model

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