TPS7A3 301 1 2 3
Texas Instruments

TPS7A3301 - 1A, -36V Ultra-Low Noise Negative LDO | Texas Instruments

MPN: TPS7A3301 βœ“ Active
In Stock (99,999) Ships in 1-3 business days
-1.18 V to -33 V Vdss 1 A Id 31.4 C/W Rds(on) VQFN-20 (RGW) 5x5 mm Package
$4.85 USD / Unit
MOQ: 1 |
Volume Pricing
Qty Unit Price Extended
1 $4.85 $4.85
10 $4.36 $43.60
100 $3.88 $388.00
500 $3.49 $1,745.00
1,000 $3.1 $3,100.00
ℹ️ All prices are in USD
View Datasheet (PDF) View Alternatives

Compatible alternatives for TPS7A3301. Verify specifications match your application requirements.

Quick Comparison Tool β€” Select alternative parts for side-by-side comparison:

TPS7A4701RGWR

Texas Instruments
Adjustable Β· 1.4 V to 34 V Β· 1 A Β· 3 V to 35 V Β· 200 mV at 1 A Β· 4.17 uVrms (20 Hz to 100 kHz) Β· 72 dB at 1 kHz Β· 6.4 mA

βœ“ 99,999 In Stock

$3.1 / Unit

View Datasheet β†’

LT3094

lower noise 0.8uVrms, but only 0.2A output

πŸ“‹ Reference alternative (not in catalog)

ADP7182

0.2A, 65dB PSRR

πŸ“‹ Reference alternative (not in catalog)

LT3015

1.5A, higher current

πŸ“‹ Reference alternative (not in catalog)

TPS7A5201

Texas Instruments
Adjustable Β· 0.8 V to 5.5 V Β· 1.5 A Β· 1.4 V to 18 V Β· 500 mV at 1.5 A Β· 6.8 uVrms (100 Hz to 100 kHz) Β· 40 dB at 1 kHz Β· 40 uA

βœ“ 99,999 In Stock

$0.75 / Unit

View Datasheet β†’

TPS7A3301 Maximum Ratings & Electrical Characteristics

Output Type Adjustable
Output Voltage Range -1.18 V to -33 V
Maximum Output Current 1 A
Input Voltage Range -3 V to -36 V
Dropout Voltage 300 mV at 1 A
Output Noise 12.7 uVrms (20 Hz to 100 kHz)
PSRR 75 dB at 1 kHz
Quiescent Current 6.4 mA
Thermal Resistance 31.4 C/W
Operating Temperature -40C to +125C
Package VQFN-20 (RGW) 5x5 mm
Mounting Type Surface Mount
MSL Level 2 (1 year)
RoHS Status Compliant
Enable Pin Yes (active-low)

TPS7A3301 Pin Configuration

QFN-20 Package Pinout Diagram QFN-20 4x4mm, P0.5mm, EP 2.5x2.5mm, JEDEC MO-220. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 QFN-20
Pin 1 OUT β€” Regulated negative output voltage
Pin 5 GND β€” Ground
Pin 6 EN β€” Enable (active low)
Pin 7 IN β€” Negative input supply

Safe Operating Area (SOA) & Thermal Characteristics

Safe Operating Area Chart Default safe operating area chart for TPS7A3301 Drain-to-Source Voltage (Vds) Drain Current (Id)

No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

TPS7A3301 is suitable for 6 applications: High-End Audio DAC Negative Supply, RF Transceiver Bias, Precision ADC/DAC Reference, Industrial -24V Bus Systems, Test and Measurement Instrumentation, Medical Monitoring Equipment.

🎧

High-End Audio DAC Negative Supply

Provides clean -5V rail for audio DACs with 12.7uVrms noise.

Recommended

PCM1794A (DAC requiring low-noise negative supply) OPA1612 (I/V converter op-amp)
🌐

RF Transceiver Bias

Provides low-noise negative bias for RF amplifiers and mixers.

Recommended

ADF4351 (PLL/VCO requiring clean negative rail) HMC241A (RF switch)
πŸ–₯️

Precision ADC/DAC Reference

Buffers negative reference voltages for precision converters.

Recommended

ADS8881 (ADC requiring low-noise reference) DAC8811 (DAC requiring negative reference)
🏭

Industrial -24V Bus Systems

Regulates -24V industrial buses to lower voltages for control circuits.

Recommended

TPS7A4701 (Positive LDO for dual-supply systems) LMZM23601 (DC-DC converter for pre-regulation)
πŸ”§

Test and Measurement Instrumentation

Provides clean negative rails for precision measurement circuits.

Recommended

OPA2277 (Precision op-amp requiring negative supply) REF5025 (Voltage reference)
πŸ’Š

Medical Monitoring Equipment

Supplies low-noise negative rails for sensitive medical sensors.

Recommended

ADS1298 (Biomedical ADC requiring negative supply) OPA333 (Zero-drift op-amp)

Recommended Products Summary

PCM1794A DAC requiring low-noise negative supply Used in: High-End Audio DAC Negative Supply OPA1612 I/V converter op-amp Used in: High-End Audio DAC Negative Supply ADF4351 PLL/VCO requiring clean negative rail Used in: RF Transceiver Bias HMC241A RF switch Used in: RF Transceiver Bias ADS8881 ADC requiring low-noise reference Used in: Precision ADC/DAC Reference DAC8811 DAC requiring negative reference Used in: Precision ADC/DAC Reference TPS7A4701 Positive LDO for dual-supply systems Used in: Industrial -24V Bus Systems LMZM23601 DC-DC converter for pre-regulation Used in: Industrial -24V Bus Systems OPA2277 Precision op-amp requiring negative supply Used in: Test and Measurement Instrumentation REF5025 Voltage reference Used in: Test and Measurement Instrumentation ADS1298 Biomedical ADC requiring negative supply Used in: Medical Monitoring Equipment OPA333 Zero-drift op-amp Used in: Medical Monitoring Equipment
What is the output voltage range of TPS7A3301?
The TPS7A3301 adjustable version outputs from -1.18V to -33V using external resistor dividers. According to TI datasheet SBVS068, the output is set by two external resistors with the formula VOUT = -1.18V * (1 + R1/R2).
Does TPS7A3301 require a heatsink at 1A output?
At VIN=-12V, VOUT=-5V, and 1A load, the TPS7A3301 dissipates approximately 7W of power. With a thermal resistance of 31.4 C/W (theta_JA), the junction temperature would rise 220C above ambient. A heatsink or substantial copper pour (at least 1 square inch) is required for reliable operation above 2-3W dissipation.
What is the difference between TPS7A3301 and TPS7A4701?
The TPS7A3301 is a negative-voltage LDO, while the TPS7A4701 is a positive-voltage LDO. Both share similar noise and PSRR specifications, but the TPS7A3301 operates with negative input and output voltages, making it suitable for dual-supply audio and analog applications.
What is the output noise of TPS7A3301?
The TPS7A3301 has an output noise of 12.7 uVrms over the 20 Hz to 100 kHz bandwidth. This makes it suitable for noise-sensitive applications such as audio DACs, RF synthesizers, and precision ADC references.
Can TPS7A3301 be used for audio applications?
Yes, the TPS7A3301 is ideal for audio DAC and op-amp negative supplies due to its 12.7 uVrms ultra-low noise and 75 dB PSRR at 1 kHz. These specifications ensure clean power rails that do not introduce audible noise or interference into the audio signal path.
What is the input voltage range of TPS7A3301?
The TPS7A3301 operates from -3V to -36V input voltage. This wide range allows it to be used in industrial -24V bus systems and other applications requiring a negative supply.
Does TPS7A3301 have an enable pin?
Yes, the TPS7A3301 has an active-low enable pin for power sequencing. This allows the regulator to be turned off by pulling the enable pin low, which is useful in multi-rail systems requiring specific power-up sequences.
What is the dropout voltage of TPS7A3301?
The TPS7A3301 has a dropout voltage of 300 mV at full 1A load. This low dropout allows efficient regulation even when the input-to-output voltage difference is small, reducing power dissipation.
Is TPS7A3301 RoHS compliant?
Yes, the TPS7A3301 is RoHS compliant. According to TI product page, the device is lead-free and halogen-free, meeting current environmental standards.
What is the package of TPS7A3301?
The TPS7A3301 is available in a 20-pin VQFN (RGW) package measuring 5x5 mm. This surface-mount package includes an exposed thermal pad for improved heat dissipation.
What is the quiescent current of TPS7A3301?
The TPS7A3301 has a quiescent current of 6.4 mA. This low quiescent current helps maintain efficiency in battery-powered or power-sensitive applications.
What is the PSRR of TPS7A3301?
The TPS7A3301 has a PSRR of 75 dB at 1 kHz. This high PSRR minimizes ripple from upstream switching converters, ensuring a clean output voltage for noise-sensitive circuits.
Can TPS7A3301 be used in industrial applications?
Yes, the TPS7A3301 is suitable for industrial applications due to its wide input voltage range (-3V to -36V) and operating temperature range (-40C to +125C). It can be used in -24V bus systems and other industrial power supplies.
What is the thermal resistance of TPS7A3301?
The TPS7A3301 has a thermal resistance of 31.4 C/W (theta_JA) in the VQFN-20 package. This value is important for calculating junction temperature and ensuring reliable operation under load.
What is the difference between TPS7A3301 and TPS7A3300?
The TPS7A3301 includes an active-low enable pin for power sequencing, while the TPS7A3300 does not have an enable pin. Both share identical noise (12.7 uVrms) and PSRR (75 dB at 1 kHz) specifications.

Engineering reference data for TPS7A3301 β€” comparison, design guidance, and compliance information.

Selection Guide

Choose TPS7A3301 when you need ultra-low noise (sub-15 uVrms) AND high output current (up to 1A) in a negative LDO. Choose LT3094 instead if your current requirement is below 200mA and you need the absolute lowest noise (0.8 uVrms). Choose LT3015 if noise is less critical but you need more than 1A output. Choose ADP7182 for a balance of moderate noise and current with lower input voltage ranges. For dual-supply systems, pair TPS7A3301 with TPS7A4701 for symmetric positive and negative rails.

Comparison with Alternatives

Parameter This Product Alternatives
Output Current 1 A Array
Output Noise 12.7 uVrms Array
PSRR at 1kHz 75 dB Array
Input Voltage Range -3 V to -36 V Array
Dropout Voltage 300 mV at 1 A Array
Enable Pin Yes (active-low) Array
Package VQFN-20 Array
Price (1pc) 4.85 USD Array

Key Differentiators

  • Highest output current in ultra-low-noise negative LDO class (vs LT3094)
  • Widest input voltage range (vs ADP7182)
  • Best PSRR at 1kHz (vs LT3015)

Design Notes

At VIN=-12V, VOUT=-5V, and 1A load, power dissipation is 7W. The VQFN-20 package has theta_JA of 31.4 C/W, resulting in a 220C junction temperature rise. A heatsink or at least 1 square inch of copper pour is required for reliable operation above 2W dissipation.

Place input and output capacitors as close to the IC pins as possible. Use a 10uF ceramic capacitor on the input and a 10uF ceramic capacitor on the output. Add a 0.1uF ceramic capacitor in parallel for high-frequency noise bypass.

Do not exceed the maximum input voltage of -36V. Ensure the external resistor divider uses 1% or better tolerance resistors to maintain output voltage accuracy. The NR/SS capacitor controls startup time and noise bandwidth - do not omit it.

Compliance Information

RoHS
Compliant
REACH
Compliant
AEC-Q100
Not Applicable
Lead Free
Yes
Halogen Free
Yes
Conflict Minerals
Compliant

RoHS compliant per TI product page. Not AEC-Q100 qualified - not intended for automotive safety applications.

Data verified on: 2026-08-02

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