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LP87743-Q1

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Automotive, three 3A low-noise buck converter PMIC for radar MMICs

Product details

Regulated outputs (#) 3 Configurability Factory programmable, Software configurable Vin (min) (V) 3 Vin (max) (V) 4 Vout (min) (V) 0.9 Vout (max) (V) 1.8 Iout (max) (A) 3 Features Output Short-Circuit and Overload Protection, Overtemperature warning and protection, Overvoltage protection, SPI, UVLO TI functional safety category Functional Safety-Compliant Step-down DC/DC converter 3 Step-down DC/DC controller 0 Step-up DC/DC controller 0 Iq (typ) (mA) 0.02 Rating Automotive Switching frequency (max) (kHz) 19200 Operating temperature range (°C) -40 to 125 Processor supplier Texas Instruments Processor name mmWave AWR, mmWave IWR Shutdown current (ISD) (typ) (µA) 20 Switching frequency (typ) (kHz) 17600 Product type Radar sensor
Regulated outputs (#) 3 Configurability Factory programmable, Software configurable Vin (min) (V) 3 Vin (max) (V) 4 Vout (min) (V) 0.9 Vout (max) (V) 1.8 Iout (max) (A) 3 Features Output Short-Circuit and Overload Protection, Overtemperature warning and protection, Overvoltage protection, SPI, UVLO TI functional safety category Functional Safety-Compliant Step-down DC/DC converter 3 Step-down DC/DC controller 0 Step-up DC/DC controller 0 Iq (typ) (mA) 0.02 Rating Automotive Switching frequency (max) (kHz) 19200 Operating temperature range (°C) -40 to 125 Processor supplier Texas Instruments Processor name mmWave AWR, mmWave IWR Shutdown current (ISD) (typ) (µA) 20 Switching frequency (typ) (kHz) 17600 Product type Radar sensor
VQFN-HR (RXV) 28 22.5 mm² 5 x 4.5
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional safety-compliant device
    • Developed for functional safety applications
    • Documentation available to aid ISO 26262 functional safety system design up to ASIL-C / SIL-2
    • Input supply overvoltage and undervoltage monitoring
    • Regulator output overvoltage and undervoltage monitoring
    • Overvoltage and undervoltage monitoring for one external rail
    • Q&A watchdog
    • Level or PWM error signal monitor (ESM)
    • BIST and CRC
  • Input voltage: 3.3V nominal (3V to 4V range)
  • Three low-noise step-down DC/DC converters:
    • Output voltage: 0.9V to 1.9V, 0.8V (BUCK3), 0.82V (BUCK3)
    • Maximum output current: 3A/ 3A/ 3A
    • Switching frequency: 4.4MHz, 8.8MHz, and 17.6MHz
  • 5V boost converter
    • Maximum output current: 350mA
  • 150mA LDO
    • Output voltage 1.8V or 3.3V
  • Output short-circuit and overload protection
  • Input overvoltage protection (OVP) and undervoltage lockout (UVLO)
  • Overtemperature warning and protection
  • Serial peripheral interface (SPI)
  • AEC-Q100 qualified with the following results:
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature
  • Functional safety-compliant device
    • Developed for functional safety applications
    • Documentation available to aid ISO 26262 functional safety system design up to ASIL-C / SIL-2
    • Input supply overvoltage and undervoltage monitoring
    • Regulator output overvoltage and undervoltage monitoring
    • Overvoltage and undervoltage monitoring for one external rail
    • Q&A watchdog
    • Level or PWM error signal monitor (ESM)
    • BIST and CRC
  • Input voltage: 3.3V nominal (3V to 4V range)
  • Three low-noise step-down DC/DC converters:
    • Output voltage: 0.9V to 1.9V, 0.8V (BUCK3), 0.82V (BUCK3)
    • Maximum output current: 3A/ 3A/ 3A
    • Switching frequency: 4.4MHz, 8.8MHz, and 17.6MHz
  • 5V boost converter
    • Maximum output current: 350mA
  • 150mA LDO
    • Output voltage 1.8V or 3.3V
  • Output short-circuit and overload protection
  • Input overvoltage protection (OVP) and undervoltage lockout (UVLO)
  • Overtemperature warning and protection
  • Serial peripheral interface (SPI)

The LP8774x-Q1 device is designed to meet the power management requirements of the AWR and IWR MMICs in various automotive and industrial radar applications. The device has three step-down DC/DC converters, a 5V boost converter and a 1.8V or 3.3V LDO. The LDO is powered from the boost and intended for xWR I/O supply. An SPI serial interface and enable signals control the device.

The step-down DC/DC converters support programmable switching frequency of 4.4MHz, 8.8MHz, or 17.6MHz. High switching frequency and low noise across wide frequency range enable LDO-free power solution with minimal or no passive filtering. The high switching frequency improves thermals and transient settling for the MMIC RF rails. The device forces the switching clock into PWM mode for optimal RF performance and can also be synchronized to an external clock. The device supports remote voltage sensing to compensate IR drop between the regulator output and the point-of-load (POL) which improves the accuracy of the output voltage.

The LP8774x-Q1 device supports programmable start-up and shutdown delays and sequences which are synchronized to the ENABLE signal. The sequences can also include GPO signals to control external regulators, load switches, and processor reset. The default settings for the device are programmed into nonvolatile memory (NVM). The device controls the output slew rate to minimize output voltage overshoot and in-rush current during device start-up.

The LP8774x-Q1 device is designed to meet the power management requirements of the AWR and IWR MMICs in various automotive and industrial radar applications. The device has three step-down DC/DC converters, a 5V boost converter and a 1.8V or 3.3V LDO. The LDO is powered from the boost and intended for xWR I/O supply. An SPI serial interface and enable signals control the device.

The step-down DC/DC converters support programmable switching frequency of 4.4MHz, 8.8MHz, or 17.6MHz. High switching frequency and low noise across wide frequency range enable LDO-free power solution with minimal or no passive filtering. The high switching frequency improves thermals and transient settling for the MMIC RF rails. The device forces the switching clock into PWM mode for optimal RF performance and can also be synchronized to an external clock. The device supports remote voltage sensing to compensate IR drop between the regulator output and the point-of-load (POL) which improves the accuracy of the output voltage.

The LP8774x-Q1 device supports programmable start-up and shutdown delays and sequences which are synchronized to the ENABLE signal. The sequences can also include GPO signals to control external regulators, load switches, and processor reset. The default settings for the device are programmed into nonvolatile memory (NVM). The device controls the output slew rate to minimize output voltage overshoot and in-rush current during device start-up.

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Technical documentation

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* Data sheet LP8774x-Q1 Three Buck Converters and 5-V Boost for AWR and IWR Radar Sensors datasheet (Rev. B) PDF | HTML 24 Jun 2024

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LP877451Q1EVM — LP8774x-Q1 evaluation module for ADAS PMIC low-noise configuration 3-buck and 5-V boost

The LP8774x-Q1 device is designed to meet the power management requirements of the AWR and IWR MMICs in various automotive and industrial radar applications. The device has three step-down DC/DC converters, a 5 V boost converter and a 1.8 V/3.3 V LDO. The LDO is powered from the boost and (...)

User guide: PDF | HTML
Simulation model

LP87745-Q1 BUCK PSpice Transient Model

SNVMCA5.ZIP (46 KB) - PSpice Model
Simulation model

LP87745-Q1 Transient and AC SIMPLIS Buck Model (Rev. C)

SNVMC81C.ZIP (65 KB) - SIMPLIS Model
Calculation tool

PEET-GUI — PMIC Efficiency Estimator Tool (PEET)

The PMIC Efficiency Estimator Tool (PEET GUI) is a graphical user interface used to easily evaluate PMIC DC/DC regulator efficiency relative to your design conditions. The PEET GUI can be used to configure each DC/DC regulator separately and provides real-time efficiency and power dissipation data (...)
Reference designs

TIDEP-01030 — mmWave diagnostic and monitoring reference design for high-end corner radars

This reference design features a built-in autonomous monitoring functionality in the mmWave radar sensors that enhances system efficiency by minimizing the processing load on the host. This design uses Safety Diagnostic Library (SDL) to perform a diagnostic test at programmable digital cores, (...)
Design guide: PDF
Reference designs

TIDEP-01027 — High-end corner radar reference design

The TIDA-01027 reference design provides a foundation for corner radar applications to meet NCAP R79 safety requirements using the AWR2944 evaluation module (EVM). The design allows users to estimate and track the position (in the azimuthal plane) and velocity of objects in device field of view (...)
Design guide: PDF
Schematic: PDF
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VQFN-HR (RXV) 28 Ultra Librarian

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