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TPS7B81

ACTIVE

150-mA, off-battery (40-V), ultra-low-IQ, low-dropout (LDO) voltage regulator with enable

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NEW TPS7E81 ACTIVE 40V 150mA low-IQ (2.8µA) low-dropout (LDO) regulator Wider Output Voltage range, slightly improved accuracy and controlled Quiescent current

TPS7B81

ACTIVE
Data sheet Order now

Product details

Rating Catalog Vin (max) (V) 40 Vin (min) (V) 3 Iout (max) (A) 0.15 Output options Fixed Output Vout (max) (V) 5 Vout (min) (V) 3.3 Fixed output options (V) 3.3, 5 Noise (µVrms) 450 PSRR at 100 KHz (dB) 60 Iq (typ) (mA) 0.0027 Features Enable Thermal resistance θJA (°C/W) 63.9, 72.8 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 1.5 Dropout voltage (Vdo) (typ) (mV) 270 Operating temperature range (°C) -40 to 125
Rating Catalog Vin (max) (V) 40 Vin (min) (V) 3 Iout (max) (A) 0.15 Output options Fixed Output Vout (max) (V) 5 Vout (min) (V) 3.3 Fixed output options (V) 3.3, 5 Noise (µVrms) 450 PSRR at 100 KHz (dB) 60 Iq (typ) (mA) 0.0027 Features Enable Thermal resistance θJA (°C/W) 63.9, 72.8 Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Accuracy (%) 1.5 Dropout voltage (Vdo) (typ) (mV) 270 Operating temperature range (°C) -40 to 125
HVSSOP (DGN) 8 14.7 mm² (3 mm × 4.9 mm) WSON (DRV) 6 4 mm² (2 mm × 2 mm)
  • Wide input voltage range: 3 V to 40 V
  • Output current: 150 mA
  • Ultra-low quiescent current (IQ):
    • 2.7 µA typical at light loads
    • 4.5 µA maximum at light loads
  • Accuracy: 1.5% over line, load, and temperature
  • Typical dropout voltage: 180 mV at 100 mA
  • Wide enable voltage range: 2 V to VIN (40 V max)
  • Input voltage transient tolerance: 45 V
  • Fixed 5-V and 3.3-V output options
  • Current limit and thermal shutdown protection
  • Stable with a wide range of capacitors (1 µF to 200 µF)(1)
  • Junction temperature range: –40°C to +150°C
  • High thermal performance packages:
    • DGN (8-pin HVSSOP), RθJA = 63.9°C/W
    • DRV (6-pin WSON), RθJA = 72.8°C/W

    (1)

(1)See the output capacitor requirements in the Recomended Operation Conditions table
  • Wide input voltage range: 3 V to 40 V
  • Output current: 150 mA
  • Ultra-low quiescent current (IQ):
    • 2.7 µA typical at light loads
    • 4.5 µA maximum at light loads
  • Accuracy: 1.5% over line, load, and temperature
  • Typical dropout voltage: 180 mV at 100 mA
  • Wide enable voltage range: 2 V to VIN (40 V max)
  • Input voltage transient tolerance: 45 V
  • Fixed 5-V and 3.3-V output options
  • Current limit and thermal shutdown protection
  • Stable with a wide range of capacitors (1 µF to 200 µF)(1)
  • Junction temperature range: –40°C to +150°C
  • High thermal performance packages:
    • DGN (8-pin HVSSOP), RθJA = 63.9°C/W
    • DRV (6-pin WSON), RθJA = 72.8°C/W

    (1)

(1)See the output capacitor requirements in the Recomended Operation Conditions table

The TPS7B81 is a low-dropout (LDO) linear regulator that operates from input voltages up to 40 V and can supply up to 150 mA in current. With only 2.7 µA of quiescent current at light loads, the device is an excellent choice for wide input supply designs and high cell count battery applications that need very low standby power consumption. The 45-V transient tolerance provides additional headroom for applications where inductive kickback may be present, thereby reducing external circuitry for voltage suppression.

With integrated short-circuit and overcurrent limiting, the TPS7B81 protects the system during fault conditions. In addition to the low standby power consumption, the very low dropout voltage in light load conditions helps maintain regulation even when powered by depleted batteries.

The TPS7B81 is available in thermally enhanced, 8-pin HVSSOP and 6-pin WSON packages. Both packages offer high thermal conductivity, and their small size supports compact design, making them well suited for space-limited applications such as power tools or motor drive modules and battery packs.

The TPS7B81 is a low-dropout (LDO) linear regulator that operates from input voltages up to 40 V and can supply up to 150 mA in current. With only 2.7 µA of quiescent current at light loads, the device is an excellent choice for wide input supply designs and high cell count battery applications that need very low standby power consumption. The 45-V transient tolerance provides additional headroom for applications where inductive kickback may be present, thereby reducing external circuitry for voltage suppression.

With integrated short-circuit and overcurrent limiting, the TPS7B81 protects the system during fault conditions. In addition to the low standby power consumption, the very low dropout voltage in light load conditions helps maintain regulation even when powered by depleted batteries.

The TPS7B81 is available in thermally enhanced, 8-pin HVSSOP and 6-pin WSON packages. Both packages offer high thermal conductivity, and their small size supports compact design, making them well suited for space-limited applications such as power tools or motor drive modules and battery packs.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet TPS7B81 150-mA, 40-V, Ultra-Low-IQ, Low-Dropout Regulator datasheet PDF | HTML Apr 23, 2020
Application note An empirical analysis of the impact of board layout on LDO thermal performance (Rev. A) PDF | HTML Sep 23, 2025
White paper Understanding the Foundations of Quiescent Current in Linear Power Systems Feb 18, 2021
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun 27, 2019
E-book LDO Basics (Rev. A) Apr 8, 2019
Technical article LDO basics: dropout PDF | HTML Mar 16, 2017

Design & development

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Evaluation board

TPS7B81EVM-025 — TPS7B81 150-mA, off-battery (40-V), ultra-low-IQ LDO voltage regulator evaluation module

The TPS7B81EVM-025 evaluation module (EVM) is designed for a typical configuration to evaluate the operation and performance of the TPS7B81, which is a 150-mA, high-voltage, ultra-low-IQ, low-dropout (LDO) linear regulator.

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

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Package Pins CAD symbols, footprints & 3D models
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WSON (DRV) 6 Ultra Librarian
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