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Texas Instruments LP877432A8RXVRQ1
- Part No.:
- LP877432A8RXVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-PowerVFQFN
- Datasheet:
-
LP877432A8RXVRQ1.pdf
- Description:
- AUTOMOTIVE, THREE 3A LOW-NOISE B
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP877432A8RXVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC designed for 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 AWR/IWR corner and front radar systems.
For engineers reviewing the LP877432A8RXVRQ1 datasheet, LP877432A8RXVRQ1 pinout, LP877432A8RXVRQ1 application, or LP877432A8RXVRQ1 equivalent, this device delivers functional safety support (ASIL-C capable), remote voltage sensing, programmable startup/shutdown sequencing, and PWM-mode forcing for RF-optimized transient response in automotive radar power rails.
Technical Context
The LP877432A8RXVRQ1 implements three independent high-frequency synchronous buck regulators with selectable switching frequencies (4.4/8.8/17.6 MHz), each delivering up to 3 A with remote sense capability to compensate IR drop at point-of-load. Its integrated 5-V boost supplies the 1.8-V/3.3-V LDO, which powers xWR I/O interfaces - enabling LDO-free RF rail designs when configured for high-frequency operation.
Functional safety features include input/output overvoltage and undervoltage monitoring, Q&A watchdog, level/PWM error signal monitor (ESM), BIST, CRC, and thermal warning/protection - all validated per ISO 26262 up to ASIL-C. The SPI interface supports full register configuration, fault reporting, and GPO-controlled external sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 4 V nominal (3.3 V typical); supports stable operation across automotive battery transients. |
| Buck Output Current | 3 A per channel (BUCK1–BUCK3); sufficient to power multiple radar MMIC cores simultaneously. |
| Switching Frequency | 4.4 / 8.8 / 17.6 MHz; enables ultra-small passive filtering and improved thermal performance for RF-sensitive rails. |
| Boost Output | 5 V / 350 mA; powers internal LDO and external 5-V loads without requiring separate boost IC. |
| LDO Output | 1.8 V or 3.3 V / 150 mA; dedicated supply for xWR I/O logic, sourced from boost output. |
| Operating Temperature | –40°C to +125°C ambient; qualified per AEC-Q100 Grade 1 for under-hood automotive radar placement. |
| Functional Safety | ASIL-C capable with documented safety analysis, ESM, watchdog, BIST, and voltage/thermal monitoring. |
Pinout & Package
LP877432A8RXVRQ1 uses a 28-pin VQFN-HR (RXV) package measuring 4.5 mm × 5.0 mm with wettable flanks, optimized for thermal dissipation and automated optical inspection in automotive PCB assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENABLE | Digital control input | Active-high enable signal synchronizing startup/shutdown sequences and GPO-triggered external regulator control. |
| FB_B1–FB_B3 | Analog feedback inputs | Remote-sense connections for BUCK1–BUCK3; compensate PCB trace IR drop to maintain ±1% output accuracy at point-of-load. |
| VOUT_BST | Boost output node | 5-V regulated output; internally connects to VIO_LDO input or accepts external 5-V source when boost is disabled. |
| VIO_LDO | LDO input/output node | Supplies 1.8-V/3.3-V I/O rail; sourced from VOUT_BST when enabled, or accepts external supply when LDO is bypassed. |
| SCK_SPI / SDI_SPI / SDO_SPI / CS_SPI/WD_DIS | SPI interface signals | Full-duplex 4-wire SPI with watchdog disable option on CS; enables real-time register read/write and fault status polling. |
| nINT / nERR/GPO2 / VMON1/GPO1 | Multipurpose digital outputs | Configurable as interrupt, error flag, or general-purpose outputs for system-level fault signaling and sequencing coordination. |
| SYNCCLKIN | External clock input | Accepts external synchronization signal (e.g., radar master clock) to align switching edges and reduce beat-frequency noise. |
| SW_B1–SW_B3 / SW_BST | Switch node terminals | High-frequency switching nodes requiring local ceramic filtering and careful layout to minimize EMI in RF-sensitive environments. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable switching frequency | Selectable 4.4/8.8/17.6 MHz per buck channel - reduces filter size and improves transient response for radar RF rails. |
| Remote voltage sensing | Compensates PCB trace resistance between regulator output and MMIC power pins, ensuring ±1% regulation accuracy at point-of-load. |
| PWM-mode forcing | Forces constant-on-time PWM operation (not PFM) to eliminate variable-frequency noise that interferes with radar signal integrity. |
| ASIL-C functional safety architecture | Includes dual-monitoring comparators, CRC-protected registers, BIST, and Q&A watchdog - supports ISO 26262 system-level safety goals. |
| Startup/shutdown sequencing | Configurable delays and GPO-driven control of external regulators/load switches - ensures safe power-up/down of multi-rail radar subsystems. |
Applications
| Short-Range Corner Radar | Long-Range Front Radar |
|---|---|
Use Scenario: Compact 24-GHz corner radar module mounted in vehicle bumper for blind-spot detection and lane-change assist. IC Role / Device Role / Timing Role: Primary power manager supplying three independent MMIC supply rails (analog core, digital logic, PLL) plus I/O interface voltage. Use Value: High-frequency buck operation (17.6 MHz) eliminates need for large output capacitors, reducing board area by >40% versus 2-MHz alternatives. | Use Scenario: 77-GHz front-facing long-range radar unit for adaptive cruise control and automatic emergency braking. IC Role / Device Role / Timing Role: Central PMIC delivering low-noise, tightly regulated voltages to RF transceiver, baseband processor, and sensor interface circuits. Use Value: Remote sensing and PWM-mode forcing maintain <10 mV ripple across temperature and load, preserving radar SNR and range accuracy. |
| Ultra-Short Range Radar | Automotive Cabin Monitoring |
Use Scenario: 60-GHz in-cabin radar for occupant detection, gesture recognition, and child presence sensing. IC Role / Device Role / Timing Role: Single-chip power solution providing isolated, low-EMI rails for RF frontend and microcontroller subsystems. Use Value: Integrated 5-V boost and 1.8-V LDO eliminate discrete components, reducing BOM count by 4 parts and improving layout symmetry for differential RF paths. | Use Scenario: Driver drowsiness and attention monitoring system using millimeter-wave radar behind dashboard trim. IC Role / Device Role / Timing Role: Functional safety-compliant power controller managing power sequencing, fault reporting, and thermal derating during continuous operation. Use Value: ASIL-C ready monitoring (OVP/UVP/OTP) and CRC-protected SPI interface enable compliance with ISO 26262 Part 6 requirements for safety-related hardware elements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar radar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP877452A7RXVRQ1 | Three buck + boost + LDO; same RXV package but OTP-configured for 8.8-MHz default switching frequency and full-performance radar optimization. | Pre-programmed for lower switching frequency - better efficiency at mid-load vs. LP877432A8RXVRQ1's 17.6-MHz default, but higher output ripple. | Select when system prioritizes thermal efficiency over RF noise floor; verify sequence timing compatibility with existing firmware. |
| LP877442A9RXVRQ1 | Three buck + boost only (no LDO); identical pinout and package, but lacks integrated 1.8-V/3.3-V LDO - requires external LDO for I/O supply. | Used in radar designs where I/O voltage is supplied externally or derived from another rail; reduces die complexity and cost. | Choose when board space allows discrete LDO placement and system design separates I/O and core power domains. |
Compared with LP877452A7RXVRQ1 and LP877442A9RXVRQ1, the LP877432A8RXVRQ1 provides the highest default switching frequency (17.6 MHz) and integrated LDO - making it optimal for space-constrained, ultra-low-noise radar modules requiring minimal external components and maximum RF performance.
Availability
LP877432A8RXVRQ1 is available at Aetrix Electronics and suitable for short-range corner radar, long-range front radar, and ultra-short range radar applications requiring stable component supply, AEC-Q100 compliance, and functional safety support.
Supply support for LP877432A8RXVRQ1 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, embedded processing, and power management technologies with leadership in automotive electronics and functional safety solutions.
The LP8774x-Q1 product line was developed specifically to address the stringent low-noise, high-reliability, and ASIL-C-capable power requirements of automotive millimeter-wave radar sensors - including AWR and IWR series MMICs.
FAQ
What is the default switching frequency configuration of the LP877432A8RXVRQ1?
The LP877432A8RXVRQ1 is OTP-programmed with a default switching frequency of 17.6 MHz for all three buck converters. This high-frequency setting minimizes output capacitor size and improves transient response for radar RF rails. Frequency can be reconfigured via SPI to 4.4 MHz or 8.8 MHz depending on thermal or efficiency trade-offs in the final design. The LP877432A8RXVRQ1 maintains full register control over frequency selection, sequencing, and protection thresholds regardless of OTP default.
Does the LP877432A8RXVRQ1 support remote voltage sensing on all buck outputs?
Yes, the LP877432A8RXVRQ1 supports remote voltage sensing on all three buck outputs (BUCK1–BUCK3) via dedicated FB_B1, FB_B2, and FB_B3 pins. This feature compensates for IR drop between the regulator output and the point-of-load, ensuring ±1% output voltage accuracy at the MMIC power pins. Remote sensing is implemented independently per channel and remains active even when the LP877432A8RXVRQ1 operates in forced PWM mode for RF noise suppression.
How does the LP877432A8RXVRQ1 implement functional safety for ASIL-C compliance?
The LP877432A8RXVRQ1 implements ASIL-C functional safety through redundant voltage monitoring (input OVP/UVLO, output OVP/UVP, external rail monitoring), Q&A watchdog, level/PWM error signal monitor (ESM), built-in self-test (BIST), and CRC-protected SPI registers. These features are documented in TI's ISO 26262 safety manual and validated per AEC-Q100 Grade 1. The LP877432A8RXVRQ1 does not require external safety monitors to achieve ASIL-C system-level goals when used per its safety configuration guidelines.
Can the LP877432A8RXVRQ1's LDO output be configured for both 1.8 V and 3.3 V?
Yes, the LP877432A8RXVRQ1's integrated LDO supports user-selectable output voltages of either 1.8 V or 3.3 V via SPI register programming. The LDO is powered from the internal 5-V boost converter and is intended for xWR I/O supply. Configuration is retained in nonvolatile memory (NVM) after power cycle. The LP877432A8RXVRQ1's VIO_LDO pin serves as both output and input - allowing external 1.8-V/3.3-V sources to bypass the internal LDO when needed.
Is the LP877432A8RXVRQ1 pin-compatible with other LP8774x-Q1 variants like LP877442A9RXVRQ1?
Yes, the LP877432A8RXVRQ1 shares identical pinout, package (RXV, 28-pin VQFN-HR), and footprint with all LP8774x-Q1 family members including LP877442A9RXVRQ1 and LP877452A7RXVRQ1. However, functional differences exist: LP877432A8RXVRQ1 integrates the LDO, while LP877442A9RXVRQ1 omits it. Pin compatibility enables mechanical interchangeability, but firmware and external circuitry must be verified for functional equivalence before substitution. The LP877432A8RXVRQ1 requires no PCB changes when replacing LP877442A9RXVRQ1 only if the LDO function is unused or externally replicated.
LP877432A8RXVRQ1 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:
- -
- 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)
LP877432A8RXVRQ1 FAQ
1.How can I place an order for LP877432A8RXVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP877432A8RXVRQ1 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 LP877432A8RXVRQ1 reliable?
The price and inventory of LP877432A8RXVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP877432A8RXVRQ1 is usually 5 days.
3.What payment methods are accepted for LP877432A8RXVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP877432A8RXVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP877432A8RXVRQ1?
LP877432A8RXVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP877432A8RXVRQ1 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 LP877432A8RXVRQ1?
For technical support, including LP877432A8RXVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP877432A8RXVRQ1 requirements.
6.How does Aetrix verify that LP877432A8RXVRQ1 is sourced from the original manufacturer or authorized distributors?
All LP877432A8RXVRQ1 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 LP877432A8RXVRQ1 meets industry standards.
7.What is the process for return or replacement of LP877432A8RXVRQ1?
All LP877432A8RXVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP877432A8RXVRQ1, 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 LP877432A8RXVRQ1 part is unused and in its original packaging.
Return procedure for LP877432A8RXVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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