Texas Instruments TPS7B4261-Q1 Voltage Tracking LDO Regulator
Texas Instruments TPS7B4261-Q1 Voltage Tracking LDO Regulator is available in an 8-pin HSOIC package. The TPS7B4261-Q1 reliably provides power to off-board sensors with a wire harness, even in harsh automotive environments. In severe operating conditions, the cables in the harness are potentially exposed to various fault conditions, which increase the risk of failure. These conditions include short to battery, short to ground, and overtemperature. The TPS7B4261-Q1 comes with integrated protection features against all of these fault conditions and protection against reverse polarity. The device uses a topology that contains two back-to-back P-channel metal-oxide semiconductor field-effect transistors (MOSFETs). This PMOS topology eliminates the need for an external diode that is otherwise required to prevent the flow of reverse current. The high 300mA current rating of the device potentially allows a single tracker to power multiple off-board sensors simultaneously. It is designed to survive the automotive load dump transient conditions and handle a 45V (absolute maximum) input voltage.
The TPS7B4261-Q1 features a power-good functionality and an independent enable pin (EN) that detects under- and overvoltage fault conditions. The TPS7B4261-Q1 switches to standby mode when the EN input pin is set to low. In this mode, the LDO's quiescent current consumption is less than 3.8µA (max.).
The Texas Instruments TPS7B4261-Q1 provides a protective buffer to the microcontroller (MCU) and ADC against fault conditions while securely transferring power to the off-board sensors. A reference voltage applied at the adjustable input pin (ADJ) is tracked with a very tight 6mV (max) tolerance at the OUT pin. This tolerance holds true for all variations across the specified load, line, and temperature values. This tight tracking tolerance is particularly beneficial for ratiometric sensors whose output is sampled by the ADC. This tolerance ensures minimal errors between the sensor power supply voltage and the ADC full-scale reference. The ratiometricity of the sensor measurement is thereby maintained.
Features
- AEC-Q100 qualified for automotive applications
- Temperature grade 1 of –40°C to +125°C, TA
- Junction temperature of –40°C to +150°C, TJ
- Wide input voltage range
- Absolute maximum range of –40V to 45V
- Operating range of 3.3V to 40V
- Wide output voltage range of 2V to 40V
- Maximum output current of 300mA
- 6mV (max.) very tight output-tracking tolerance
- Low dropout voltage of 330mV at 200mA
- Independent enable pin functionality
- Power-good functionality detects under- and overvoltage conditions
- Low quiescent current at a light load of 55µA
- Stable over a wide range of ceramic output capacitor values
- COUT range of 1µF to 100µF
- ESR range of 1mΩ to 2Ω
- Integrated protection features
- Reverse current protection
- Reverse polarity protection
- Overtemperature protection
- Protection against output short circuit to ground and supply
- Available in a low thermal resistance, 8-pin package, HSOIC (DDA), RθJA = 48℃/W
Applications
- Powertrain pressure sensors
- Powertrain temperature sensors
- Powertrain exhaust sensors
- Powertrain fluid concentration sensors
- Body control modules (BCM)
- Zone control modules (ZCM)
- HVAC control modules
Typical Application
Development Tool
Texas Instruments TPS7B4261EVM-151 Regulator Evaluation Module
This module evaluates the TPS7B4261-Q1 tracker LDO linear regulator for in circuit applications.