TPS7B86-Q1 Automotive LDO Linear Regulator

17 March, 2022

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Texas Instruments’ adjustable regulator features power-good and is designed for powering always-on components in standby systems

Texas Instruments’ TPS7B86-Q1 is a low-dropout (LDO) linear regulator that is 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 dumps) that are anticipated in automotive systems. With a 17 µA quiescent current at light loads, the regulator is an optimal solution for powering always-on components such as microcontrollers (MCUs) and controller area network (CAN) transceivers in standby systems.

The TPS7B86-Q1 has a state-of-the-art transient response that allows the output to quickly react to changes in load or line such as 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 ±0.85% overline, overload, and overtemperature. The power-good delay can be adjusted by external components, allowing the delay time to be configured to fit application-specific systems. The TPS7B86-Q1 is available in thermally conductive packaging to allow the device components to efficiently transfer heat to the circuit board.

Features

AEC-Q100 qualified for automotive applications:
- Temperature Grade 1 range T_A: -40°C to +125°C
- Junction temperature range T_J: -40°C to +150°C
Input voltage range: 3 V to 40 V (42 V max.)
Output voltage range:
- Adjustable output range: 1.2 V to 18 V
- Fixed output: 3.3 V and 5 V
Power-good with a programmable delay period
Output current: 500 mA (max.)
Output voltage accuracy: ±0.85% (max.)
Low dropout voltage: 475 mV (max.) at 450 mA (V_OUT ≥3.3 V)
Low quiescent current:
- 17 µA (typ.) at light loads
- 5 µA (max.) when disabled
Excellent line transient response:
- Deviation during cold-crank: ±2% V_OUT
- Deviation: ±2% V_OUT (1 V/µs V_IN slew rate)
Stable with a 2.2 µF or larger capacitor
Package options:
- 5-pin TO-252: 29.7°C/W R_θJA
- 8-pin HSOIC-8 with a thermal pad: 41.8°C/W R_θJA