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TPS7B4256-Q1

ACTIVE

Automotive, 70-mA 40-V voltage-tracking low-dropout regulator with FB and 6-mV tracking tolerance

TPS7B4256-Q1

ACTIVE

Product details

Output options Tracking Output Iout (max) (A) 0.07 Vin (max) (V) 40 Vin (min) (V) 3 Vout (max) (V) 40 Vout (min) (V) 2 Noise (µVrms) 150 Iq (typ) (mA) 0.034 Thermal resistance θJA (°C/W) 53, 101 Rating Automotive Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features Reverse Current Protection, Reverse voltage protection, Short-to-battery protection Dropout voltage (Vdo) (typ) (mV) 300 Operating temperature range (°C) -40 to 125
Output options Tracking Output Iout (max) (A) 0.07 Vin (max) (V) 40 Vin (min) (V) 3 Vout (max) (V) 40 Vout (min) (V) 2 Noise (µVrms) 150 Iq (typ) (mA) 0.034 Thermal resistance θJA (°C/W) 53, 101 Rating Automotive Load capacitance (min) (µF) 1 Regulated outputs (#) 1 Features Reverse Current Protection, Reverse voltage protection, Short-to-battery protection Dropout voltage (Vdo) (typ) (mV) 300 Operating temperature range (°C) -40 to 125
HSOIC (DDA) 8 29.4 mm² 4.9 x 6 SOIC (D) 8 29.4 mm² 4.9 x 6
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, T A
    • Junction temperature: –40°C to +150°C, T J
  • Wide input voltage range:
    • Absolute maximum range: –40 V to +45 V
    • Operating range: 3 V to 40 V
  • Output voltage:
    • Wide operating range: 2 V to 40 V
    • Output voltage flexibility: V OUT can be scaled to values that are higher or lower than the reference using external resistors in a voltage divider configuration
  • Maximum output current: 70 mA
  • Very tight output-tracking tolerance: 6 mV (max)
  • Low dropout voltage: 225 mV (max) at 70 mA
  • Combined enable and reference functionalities
  • Low quiescent current at light load: 60 µA
  • Stable over a wide range of ceramic output capacitor values:
    • C OUT range: 1 µF to 100 µF
    • ESR range: 1 mΩ to 2 Ω
  • Integrated protection features:
    • Reverse current protection
    • Reverse polarity protection
    • Overtemperature protection
    • Protection against output short circuit to ground and supply
  • Available in the following low thermal resistance 8-pin packages :
    • HSOIC (DDA), R θJA = 53.3°C/W
    • SOIC (D), R θJA = 101°C/W
  • AEC-Q100 qualified for automotive applications:
    • Temperature grade 1: –40°C to +125°C, T A
    • Junction temperature: –40°C to +150°C, T J
  • Wide input voltage range:
    • Absolute maximum range: –40 V to +45 V
    • Operating range: 3 V to 40 V
  • Output voltage:
    • Wide operating range: 2 V to 40 V
    • Output voltage flexibility: V OUT can be scaled to values that are higher or lower than the reference using external resistors in a voltage divider configuration
  • Maximum output current: 70 mA
  • Very tight output-tracking tolerance: 6 mV (max)
  • Low dropout voltage: 225 mV (max) at 70 mA
  • Combined enable and reference functionalities
  • Low quiescent current at light load: 60 µA
  • Stable over a wide range of ceramic output capacitor values:
    • C OUT range: 1 µF to 100 µF
    • ESR range: 1 mΩ to 2 Ω
  • Integrated protection features:
    • Reverse current protection
    • Reverse polarity protection
    • Overtemperature protection
    • Protection against output short circuit to ground and supply
  • Available in the following low thermal resistance 8-pin packages :
    • HSOIC (DDA), R θJA = 53.3°C/W
    • SOIC (D), R θJA = 101°C/W

The TPS7B4256-Q1 is a monolithic, integrated, low-dropout (LDO) voltage tracker. The device is available in 8-pin SOIC and HSOIC packages. The TPS7B4256-Q1 is designed to provide power supply to off-board sensors in an automotive environment. Because the risk of failure in cables that deliver off-board power is high, the device comes with integrated protection features against fault conditions such as short to battery, reverse polarity, output short to ground (current limit), and overtemperature (thermal shutdown). The device incorporates a back-to-back PMOS topology that eliminates the need for an external diode that is otherwise required to help protect against fault conditions that result in flow of reverse current. The device is designed to handle a 45-V (absolute maximum) input voltage and survive the automotive load dump transient conditions.

A reference voltage applied at the adjustable input pin (ADJ/EN) is tracked with a very tight 6 mV (max) tolerance at the FB pin across temperature. This tracking enables the TPS7B4256-Q1 to deliver a power-supply voltage with high precision for loads up to 70 mA. The reference voltage can be directly connected to the ADJ/EN pin or scaled down to lower values with the help of an external resistor divider at the ADJ/EN pin to a minimum of 2 V. The output voltage can be made equal to the voltage at the ADJ/EN pin (± the tracking tolerance) by tying the FB pin directly to the OUT pin or scaled to higher values with the help of a resistive voltage divider between the FB and the OUT pin.

The TPS7B4256-Q1 provides an effective buffer to the reference voltage of an ADC and securely transmits this voltage (or a scaled version thereof) over a long cable to power off-board sensors. If the sensor is ratiometric and the output is sampled by the ADC, the described features of the TPS7B4256-Q1 help significantly improve the reliability and accuracy of the sensor measurements.

By setting the ADJ/EN input pin low, the TPS7B4256-Q1 switches to standby mode and reduces the quiescent current consumption of the LDO to less than 3.5 µA.

The TPS7B4256-Q1 is a monolithic, integrated, low-dropout (LDO) voltage tracker. The device is available in 8-pin SOIC and HSOIC packages. The TPS7B4256-Q1 is designed to provide power supply to off-board sensors in an automotive environment. Because the risk of failure in cables that deliver off-board power is high, the device comes with integrated protection features against fault conditions such as short to battery, reverse polarity, output short to ground (current limit), and overtemperature (thermal shutdown). The device incorporates a back-to-back PMOS topology that eliminates the need for an external diode that is otherwise required to help protect against fault conditions that result in flow of reverse current. The device is designed to handle a 45-V (absolute maximum) input voltage and survive the automotive load dump transient conditions.

A reference voltage applied at the adjustable input pin (ADJ/EN) is tracked with a very tight 6 mV (max) tolerance at the FB pin across temperature. This tracking enables the TPS7B4256-Q1 to deliver a power-supply voltage with high precision for loads up to 70 mA. The reference voltage can be directly connected to the ADJ/EN pin or scaled down to lower values with the help of an external resistor divider at the ADJ/EN pin to a minimum of 2 V. The output voltage can be made equal to the voltage at the ADJ/EN pin (± the tracking tolerance) by tying the FB pin directly to the OUT pin or scaled to higher values with the help of a resistive voltage divider between the FB and the OUT pin.

The TPS7B4256-Q1 provides an effective buffer to the reference voltage of an ADC and securely transmits this voltage (or a scaled version thereof) over a long cable to power off-board sensors. If the sensor is ratiometric and the output is sampled by the ADC, the described features of the TPS7B4256-Q1 help significantly improve the reliability and accuracy of the sensor measurements.

By setting the ADJ/EN input pin low, the TPS7B4256-Q1 switches to standby mode and reduces the quiescent current consumption of the LDO to less than 3.5 µA.

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* Data sheet TPS7B4256-Q1Automotive, 70-mA, 40-V, Voltage-Tracking LDO With 6-mV Tracking Tolerance datasheet (Rev. A) PDF | HTML 27 Nov 2023

Design & development

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Evaluation board

TRKRLDOEVM-119 — General-purpose low-dropout (LDO) tracker regulator evaluation module

The General-purpose low-dropout (LDO) tracker regulator evaluation module (EVM) is used to evaluate the operation and performance of TI's tracker LDO devices with pads for external components as well as an on-board load transient circuit that is optimized for very low parasitic measurements. This (...)

User guide: PDF | HTML
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Simulation model

TPS7B4256-Q1 DDA PSpice Model

SBVM993.ZIP (23 KB) - PSpice Model
Package Pins Download
HSOIC (DDA) 8 View options
SOIC (D) 8 View options

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