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Texas Instruments TPS7B85-Q1 Low-Dropout Linear Regulator

Texas Instruments TPS7B85-Q1 Low-Dropout Linear Regulators are designed to connect to the battery in automotive applications. The device has an input voltage range extending to 40V, which allows the device to withstand transients (such as load dump) that are anticipated in automotive systems. With only a 18µA 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 a 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 the dropout. During normal operation, the device has a tight DC accuracy of ±0.75% over line, load, and temperature. The Texas Instruments 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.

Features

AEC-Q100 qualified for automotive applications:
- –40°C to +125°C, T_A temperature grade 1
- –40°C to +150°C, T_J junction temperature
3V to 40V (42V max) input voltage range
3.3V and 5V (fixed) output voltage range
Up to 150mA output current
±0.75% (max) output voltage accuracy
Low dropout voltage
- 225mV (max) at 150mA (V_OUT ≥ 3.3V)
Low quiescent current
- 18µA (typ)
- 4µA (max) when disabled

Excellent line transient response
- ±2% V_OUT deviation during cold-crank
- ±2% V_OUT deviation (1V/µs V_IN slew rate)
Integrated voltage detection
Power-good with adjustable threshold and programmable delay period
Stable with a 2.2µF or larger capacitor
Functional Safety-Capable
- Documentation available to aid functional safety system design
10-pin VSON with thermal pad package
- 50.3°C/W low thermal resistance (RθJA)

Applications

Reconfigurable instrument clusters
Body control modules (BCM)
Always-on battery-connected applications
- Automotive gateways
- Remote keyless entries (RKE)

Texas Instruments TPS7B85-Q1 Low-Dropout Linear Regulator

Features

Applications

Typical Application Schematic

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