1A High-Accuracy Low-Noise Low-Dropout (LDO) Voltage Regulator - TPS7A91


1A High-Accuracy Low-Noise Low-Dropout (LDO) Voltage Regulator


Recommended alternative parts

  • TPS7A88  -  TPS7A88 is a dual-channel, low-noise, 1-A LDO
  • TPS7A8300  -  TPS7A8300 is a single-channel, low-noise, 2-A LDO with Low In Low Out
  • TPS7A47  -  TPS7A47 is a single-channel, low-noise, high voltage, 1-A LDO


The TPS7A91 is a low-noise (4.7 µVRMS), low-dropout (LDO) voltage regulator capable of sourcing 1 A with only 200 mV of maximum dropout.

The TPS7A91 output is adjustable with external resistors from 0.8 V to 5.2 V. The TPS7A91 wide input-voltage range supports operation as low as 1.4 V and up to 6.5 V.

With 1% output voltage accuracy (over line, load, and temperature) and soft-start capabilities to reduce in-rush current, the TPS7A91 is ideal for powering sensitive analog low-voltage devices [such as voltage-controlled oscillators (VCOs), analog-to-digital converters (ADCs), digital-to-analog converters (DACs), high-end processors, and field-programmable gate arrays (FPGAs)].

The TPS7A91 is designed to power noise-sensitive components such as those found in high-speed communication, video, medical, or test and measurement applications. The very low 4.7-µVRMS output noise and wideband PSRR (40 dB at 1 MHz) minimizes phase noise and clock jitter. These features maximize performance of clocking devices, ADCs, and DACs.


  • 1.0% Accuracy Over Line, Load, and Temperature
  • Low Output Noise: 4.7 µVRMS (10 Hz–100 kHz)
  • Low Dropout: 200 mV (max) at 1 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):
    • 70 dB at DC
    • 40 dB at 100 kHz
    • 40 dB at 1 MHz
  • Fast Transient Response
  • Adjustable Start-Up In-Rush Control with Selectable Soft-Start Charging Current
  • Open-Drain Power-Good (PG) Output
  • 2.5-mm × 2.5-mm, 10-Pin SON Package

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Parametrics Compare all products in Single Channel LDO

Iout (Max) (A)
Output Options
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iq (Typ) (mA)
Vdo (Typ) (mV)
Accuracy (%)
Noise (uVrms)
PSRR @ 100KHz (dB)
Output Capacitor Type
Operating Temperature Range (C)
1    0.5    2   
Adjustable Output    Adjustable Output    Adjustable Output   
1.4    1.4    1.4   
6.5    6.5    6.5   
0.8    0.8    0.8   
5.2    5.7    5.2   
2.1    2.1    2.1   
130    75    260   
1    1    1   
4.7    4.7    4.7   
48    48    48   
Ceramic    Ceramic    Ceramic   
Catalog    Catalog    Catalog   
-40 to 125    -40 to 125    -40 to 125   
10SON    10SON    10SON   

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