In automotive battery-connected applications, low quiescent current (IQ) is important to conserve energy and to extend battery lifetime. Always-on systems must have ultra-low IQ over an extended temperature range to enable sustained operation when the vehicle ignition is off.
The TPS7B81-Q1 is a low-dropout (LDO) linear regulator designed for up to 40V VIN applications. With only a 2.7µA typical quiescent current at light load, the device is an optimum design for powering microcontrollers and controller area network and local interconnect network (CAN/LIN) transceivers in standby systems.
The device features integrated short-circuit and overcurrent protection. This device operates in ambient temperatures from –40°C to +125°C and with junction temperatures from –40°C to +150°C. Additionally, this device is available in several packages of varying size and thermal conductivity. The compact WSON package comes in a wettable flank option. The TO-252 package enables sustained operation despite significant dissipation across the device. These features make the device well suited as a power supply for various battery-connected automotive applications.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | TPS7B81-Q1 Automotive, 150mA, Off-Battery, Ultra-Low IQ (3µA), Low-Dropout Regulator datasheet (Rev. F) | PDF | HTML | 25 Sep 2025 |
| Product overview | Low Quiescent Current LDOs for Battery Connected Automotive Systems (Rev. A) | PDF | HTML | 22 Apr 2026 | |
| Application note | An empirical analysis of the impact of board layout on LDO thermal performance (Rev. A) | PDF | HTML | 23 Sep 2025 | |
| Functional safety information | TPS7B81-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 21 Sep 2022 | |
| Functional safety information | TPS7B81-Q1 Functional Safety FIT Rate and Failure Mode Distribution | 17 Dec 2019 | ||
| Application note | A Topical Index of TI LDO Application Notes (Rev. F) | 27 Jun 2019 | ||
| E-book | LDO Basics (Rev. A) | 08 Apr 2019 | ||
| Technical article | LDO basics: dropout | PDF | HTML | 16 Mar 2017 |
For additional terms or required resources, click any title below to view the detail page where available.
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HVSSOP (DGN) | 8 | Ultra Librarian |
| TO-252 (KVU) | 5 | Ultra Librarian |
| WSON (DRV) | 6 | Ultra Librarian |
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