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Texas Instruments LP877451A1RXVRQ1
- Part No.:
- LP877451A1RXVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-PowerVFQFN
- Datasheet:
-
LP877451A1RXVRQ1.pdf
- Description:
- AUTOMOTIVE THREE 3-A LOW-NOISE B
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP877451A1RXVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC designed for AWR/IWR radar MMICs, integrating three 3-A buck converters (0.9–1.9 V, 4.4/8.8/17.6 MHz), a 5-V/350-mA boost converter, and a 1.8-V/3.3-V 150-mA LDO - all in a 28-pin VQFN-HR (RXV) package for corner, front, and ultra-short range radar systems.
For engineers reviewing the LP877451A1RXVRQ1 datasheet, LP877451A1RXVRQ1 pinout, LP877451A1RXVRQ1 application, or LP877451A1RXVRQ1 equivalent, key selection criteria include functional safety support (ASIL-C/SIL-2), programmable startup sequencing, remote voltage sensing, PWM-mode forced switching for RF performance, and OTP-configured default register settings specific to this A1 variant.
Technical Context
The LP877451A1RXVRQ1 implements three independent high-frequency synchronous buck regulators with selectable switching frequencies (4.4/8.8/17.6 MHz), enabling LDO-free power delivery to radar RF rails while minimizing output ripple and improving transient response. Each buck supports remote sensing and programmable slew rate control to suppress in-rush current and overshoot during startup.
Its integrated 5-V boost supplies the 1.8-V/3.3-V LDO, which powers xWR I/O interfaces; the SPI interface enables full configuration of sequencing, monitoring thresholds (input/output OVP/UVP, external rail monitoring), watchdog behavior, and fault reporting via nERR/GPO2 and VMON1/GPO1 pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 4.0 V nominal 3.3 V supply - optimized for automotive battery-derived rails with tight regulation tolerance. |
| Buck Output Current | 3 A per channel (BUCK1/BUCK2/BUCK3) - sufficient to power multiple radar MMIC cores simultaneously. |
| Switching Frequency | 4.4 MHz / 8.8 MHz / 17.6 MHz - high-frequency operation reduces passive filter size and improves thermal performance in compact radar modules. |
| Boost Output | 5 V at 350 mA - powers internal LDO and supports external 5-V loads such as CAN transceivers or level shifters. |
| LDO Output Options | 1.8 V or 3.3 V at 150 mA - configurable via OTP to match xWR sensor I/O voltage requirements without external regulators. |
| Functional Safety | ASIL-C / SIL-2 compliant - includes BIST, CRC, Q&A watchdog, ESM monitoring, and dual-level voltage monitoring for system-level safety architecture. |
| Ambient Temp Range | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for under-hood and front-bumper radar placement. |
Pinout & Package
VQFN-HR (RXV) 28-pin package, 4.5 mm × 5.0 mm body size, wettable flank design for automated optical inspection (AOI) and enhanced solder joint reliability in automotive production.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENABLE | Digital control input | Active-high enable signal that synchronizes startup/shutdown sequences and GPO-controlled external regulators or reset signals. |
| CS_SPI/WD_DIS | Dual-function digital I/O | Primary: SPI chip select; alternative: hardware watchdog deactivation - allows fail-safe disable of safety monitor during debug or safe state entry. |
| nINT | Interrupt output | Open-drain interrupt signal indicating fault conditions (OVP/UVP/thermal), also supports CAN PHY control in integrated radar-CAN systems. |
| VMON1/GPO1 | Configurable analog/digital pin | Primary: external rail voltage monitor input; alternatives: GPO1 or FAULT1 output - enables flexible system-level fault signaling or control timing. |
| nERR/GPO2 | Configurable digital I/O | Primary: MCU error monitoring input; alternatives: GPO2 or FAULT2 output - supports bidirectional safety communication between PMIC and host processor. |
| SYNCCLKIN | External clock input | Accepts external synchronization signal to align buck switching clocks - critical for EMI reduction and deterministic RF timing in multi-sensor radar clusters. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable startup/shutdown sequencing | Enables precise power-up order across BUCKs, BOOST, and LDO - prevents latch-up and ensures correct MMIC initialization before RF activation. |
| Remote voltage sensing (RVS) | Compensates for PCB IR drop between regulator output and point-of-load - maintains ±1% output accuracy at MMIC supply pins despite trace resistance. |
| PWM-mode forced switching | Eliminates frequency modulation noise in sensitive RF bands - guarantees stable 4.4/8.8/17.6 MHz clocking for clean radar signal generation. |
| OTP-configured defaults | A1 variant stores factory-programmed register values (e.g., BUCK3 = 0.82 V, Fsw = 17.6 MHz) - eliminates boot-time SPI writes and accelerates system boot. |
| Integrated safety monitors | Dual-level OVP/UVP on all rails plus overtemperature warning/protection - provides layered fault detection aligned with ISO 26262 ASIL-C requirements. |
Applications
| Short-Range Corner Radar | Long-Range Front Radar |
|---|---|
|
Use Scenario: Compact 24-GHz corner radar module mounted in vehicle door pillars for blind-spot detection and lane-change assist. IC Role / Device Role / Timing Role: Primary power manager supplying regulated 1.1 V (BUCK1), 1.2 V (BUCK2), and 0.82 V (BUCK3) to MMIC RF core, baseband, and PLL sections. Use Value: High-frequency 17.6-MHz buck operation minimizes output filtering, enabling ultra-low-profile PCB layout with no external LDO required for RF rails. |
Use Scenario: 77-GHz front-facing radar unit integrated into vehicle grille for adaptive cruise control and automatic emergency braking. IC Role / Device Role / Timing Role: Central power controller delivering synchronized 0.9 V, 1.0 V, and 1.9 V to multi-core radar SoC, with 5-V boost powering CAN FD interface and 3.3-V LDO for sensor I/O. Use Value: Remote sensing and programmable slew rate ensure <±10 mV output deviation at MMIC pins under dynamic load steps - preserving RF phase stability during object tracking. |
| Ultra-Short Range Parking Radar | Radar-CAN Gateway Module |
|
Use Scenario: 79-GHz ultrasonic-assisted parking radar embedded in rear bumper with tight thermal constraints. IC Role / Device Role / Timing Role: Single-chip power solution providing 1.8-V LDO output for microcontroller I/O, 5-V boost for CAN transceiver, and three low-noise bucks for radar transceiver stages. Use Value: AEC-Q100 Grade 1 rating and integrated overtemperature protection enable reliable operation at 125°C ambient - critical for sealed bumper enclosures. |
Use Scenario: Central domain controller aggregating data from multiple radar sensors and communicating via CAN FD to ADAS ECU. IC Role / Device Role / Timing Role: Power management hub supplying 3.3 V to microcontroller, 5 V to CAN FD PHY, and 0.8 V to high-speed serial interface buffers. Use Value: nINT and nERR/GPO2 pins provide direct hardware-level fault signaling to MCU - reducing software polling latency and supporting fast fail-safe shutdown. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar radar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP877442A9RXVRQ1 | Omits VIO_LDO; only includes three bucks + 5-V boost - no internal 1.8/3.3-V LDO output. | Suitable where external I/O supply is available or managed separately - reduces BOM count but requires additional regulator design. | Select when radar system uses discrete 3.3-V I/O rail and does not require integrated LDO sourcing from boost. |
| LP877432A8RXVRQ1 | Three bucks only; no boost or LDO - lacks 5-V generation and I/O supply capability. | Targeted at radar variants using externally supplied 5-V and 3.3-V rails - minimal feature set for cost-sensitive designs. | Choose only if full 5-V boost and LDO functionality are handled by separate ICs or system-level supplies. |
Compared with LP877442A9RXVRQ1 and LP877432A8RXVRQ1, the LP877451A1RXVRQ1 uniquely integrates all three power domains (buck, boost, LDO) with ASIL-C safety features and OTP-configured 17.6-MHz operation - making it the only option for space-constrained, safety-critical radar modules requiring zero external power components.
Availability
LP877451A1RXVRQ1 is available at Aetrix Electronics and suitable for short-range corner radar, long-range front radar, and ultra-short range parking radar applications requiring stable component supply, automotive-grade lifecycle assurance, and functional safety compliance.
Supply support for LP877451A1RXVRQ1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in automotive power management and radar solutions.
The LP8774x-Q1 product line delivers highly integrated, safety-certified power management ICs specifically engineered for AWR/IWR millimeter-wave radar sensors - balancing RF noise performance, thermal efficiency, and ASIL-C compliance in compact automotive modules.
FAQ
What is the OTP configuration for LP877451A1RXVRQ1?
The LP877451A1RXVRQ1 is factory-programmed with OTP settings specifying BUCK3 output at 0.82 V and default switching frequency at 17.6 MHz. These values are stored in nonvolatile memory and applied automatically at power-on, eliminating the need for initial SPI configuration and ensuring deterministic startup behavior in radar systems.
Does LP877451A1RXVRQ1 support external clock synchronization?
Yes, LP877451A1RXVRQ1 accepts an external clock signal on the SYNCCLKIN pin to synchronize its internal buck switching clocks. This capability enables deterministic EMI alignment across multiple radar modules and supports time-synchronized beamforming in multi-sensor ADAS architectures.
How does LP877451A1RXVRQ1 implement functional safety monitoring?
LP877451A1RXVRQ1 provides ASIL-C–compliant safety monitoring through input/output OVP/UVP detection, external rail voltage monitoring, Q&A watchdog, level/PWM error signal monitoring (ESM), BIST, and CRC validation - all documented to support ISO 26262 system-level safety analysis up to ASIL-C.
What is the role of the VIO_LDO pin on LP877451A1RXVRQ1?
The VIO_LDO pin on LP877451A1RXVRQ1 serves as the output node for the internal 1.8-V/3.3-V LDO, which is powered from the 5-V boost converter. It supplies regulated I/O voltage to xWR radar sensors and must not be loaded externally - the LDO is intended solely for internal sensor interface use.
Can LP877451A1RXVRQ1 operate without SPI configuration?
Yes, LP877451A1RXVRQ1 operates autonomously using factory-programmed OTP defaults - including output voltages, switching frequencies, and sequencing delays. SPI is optional for runtime reconfiguration or diagnostics, but not required for basic power delivery to radar MMICs.
LP877451A1RXVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Radar Sensors
- Current - Supply:
- 20µA
- Voltage - Supply:
- 3V ~ 4V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-VQFN-HR (4.5x5)
LP877451A1RXVRQ1 FAQ
1.How can I place an order for LP877451A1RXVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP877451A1RXVRQ1 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LP877451A1RXVRQ1 reliable?
The price and inventory of LP877451A1RXVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP877451A1RXVRQ1 is usually 5 days.
3.What payment methods are accepted for LP877451A1RXVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP877451A1RXVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP877451A1RXVRQ1?
LP877451A1RXVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP877451A1RXVRQ1 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LP877451A1RXVRQ1?
For technical support, including LP877451A1RXVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP877451A1RXVRQ1 requirements.
6.How does Aetrix verify that LP877451A1RXVRQ1 is sourced from the original manufacturer or authorized distributors?
All LP877451A1RXVRQ1 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LP877451A1RXVRQ1 meets industry standards.
7.What is the process for return or replacement of LP877451A1RXVRQ1?
All LP877451A1RXVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP877451A1RXVRQ1, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LP877451A1RXVRQ1 part is unused and in its original packaging.
Return procedure for LP877451A1RXVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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