Product details


Output options Fixed Output Iout (Max) (A) 0.15 Vin (Max) (V) 40 Vin (Min) (V) 3 Vout (Max) (V) 5 Vout (Min) (V) 3.3 Fixed output options (V) 3.3, 5 Noise (uVrms) 280 Iq (Typ) (mA) 0.02 Thermal resistance θJA (°C/W) 47 Load capacitance (Min) (µF) 2.2 Rating Automotive Regulated outputs (#) 1 Features Enable, Power Good, Power-Fail Detect Accuracy (%) 1.5 PSRR @ 100 KHz (dB) 70 Dropout voltage (Vdo) (Typ) (mV) 100 Operating temperature range (C) -40 to 150 open-in-new Find other Linear regulators (LDO)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 open-in-new Find other Linear regulators (LDO)


  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, TA
    • Junction temperature: –40°C to +150°C, TJ
  • Input voltage range: 3 V to 40 V (42 V max)
  • Output voltage range: 3.3 V and 5 V (fixed)
  • Output current: up to 150 mA
  • Output voltage accuracy: ±0.75% (max)
  • Low dropout voltage:
    • 225 mV (max) at 150 mA (VOUT ≥ 3.3 V)
  • Low quiescent current:
    • 18 µA (typ)
    • 4 µA (max) when disabled
  • Excellent line transient response:
    • ±2% VOUT deviation during cold-crank
    • ±2% VOUT deviation (1-V/µs VIN slew rate)
  • Integrated voltage detection
  • Power-good with adjustable threshold and programmable delay period
  • Stable with a 2.2-µF or larger capacitor
  • Functional Safety-Capable
  • Package: 10-pin VSON with thermal pad
    • Low thermal resistance (RθJA): 50.3°C/W

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The TPS7B85-Q1 is a low-dropout linear regulator designed to connect to the battery in automotive applications. The device has an input voltage range extending to 40 V, which allows the device to withstand transients (such as load dump) that are anticipated in automotive systems. With only an 18-µA quiescent current, the device is an optimal solution for powering always-on components such as microcontrollers (MCUs) and controller area network (CAN) transceivers in standby systems.

The device has state-of-the-art transient response that allows the output to quickly react to changes in load or line (for example, during cold-crank conditions). Additionally, the device has a novel architecture that minimizes output overshoot when recovering from dropout. During normal operation, the device has a tight DC accuracy of ±0.75% over line, load, and temperature.

The TPS7B85-Q1 is equipped with power-good and integrated voltage monitoring. The power-good delay and voltage threshold can be adjusted by external components. The integrated voltage detector can be used to monitor the input voltage and alert downstream components (such as MCUs) when the battery voltage begins to fall.

The device is available in a small VSON package that facilitates a compact printed circuit board (PCB) design. The low thermal resistance enables sustained operation despite significant dissipation across the device.

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Technical documentation

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Type Title Date
* Datasheet TPS7B85-Q1 150-mA, 40-V, Low-Dropout Regulator With Power-Good and Integrated Voltage Monitoring datasheet (Rev. A) Nov. 17, 2020
User guide TPS7B8550 Evaluation Module User's Guide Feb. 14, 2020
Technical article LDO basics: capacitor vs. capacitance Aug. 01, 2018
Technical article LDO Basics: Preventing reverse current Jul. 25, 2018
Technical article LDO basics: introduction to quiescent current Jun. 20, 2018
Technical article LDO basics: noise – part 1 Jun. 14, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

document-generic User guide

The TPS7B8550 evaluation module (EVM) evaluates the operation and performance of the TPS7B85-Q1 linear regulator. This EVM configuration contains a single wide-input-voltage, small-size, low-dropout (LDO) regulator for a wide range of applications.

The regulator is capable of delivering up to 150 mA (...)

  • Qualified for automotive applications
  • Operating junction temperature range: -40°C to 150°C
  • Wide VIN range: 3 V to 40 V, up to 42 V transient
  • Maximum output current: 150 mA
  • 2% output-voltage accuracy

Design tools & simulation

SBVM967.ZIP (12 KB) - PSpice Model

CAD/CAE symbols

Package Pins Download
VSON (DRC) 10 View options

Ordering & quality

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  • Ongoing reliability monitoring

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Support & training

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