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Texas Instruments LP877442A9RXVRQ1
- Part No.:
- LP877442A9RXVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 28-PowerVFQFN
- Datasheet:
-
LP877442A9RXVRQ1.pdf
- Description:
- AUTOMOTIVE, THREE 3A LOW-NOISE B
- Quantity:
- Payment:
- Shipping:
Inventory:1,303
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Product details
Overview
LP877442A9RXVRQ1 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 (0.8–1.9 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 package for corner, front, and ultra-short range radar systems.
For engineers reviewing the LP877442A9RXVRQ1 datasheet, LP877442A9RXVRQ1 pinout, LP877442A9RXVRQ1 application, or LP877442A9RXVRQ1 equivalent, this device delivers functional safety support (ASIL-C ready), remote voltage sensing, programmable sequencing, and high-frequency low-noise operation critical for RF-sensitive radar power rails.
Technical Context
The LP877442A9RXVRQ1 implements three independent 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 5-V boost converter powers the integrated LDO, which supplies I/O for xWR MMICs.
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 aligned with ISO 26262 system design up to ASIL-C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3 V to 4 V nominal 3.3 V supply - supports stable operation across automotive battery transients. |
| Buck Output Current | 3 A per channel (BUCK1/BUCK2/BUCK3) - sufficient for high-current RF MMIC core rails. |
| Switching Frequency | 4.4 / 8.8 / 17.6 MHz - enables compact passive filtering and improved thermal response for radar transients. |
| Boost Output | 5 V / 350 mA - powers internal LDO and external 5-V peripherals without external boost IC. |
| LDO Output Options | 1.8 V or 3.3 V / 150 mA - configurable I/O supply for AWR/IWR sensor interface logic. |
| Operating Temperature | –40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood automotive radar placement. |
| Interface | SPI with CS/SCK/SDI/SDO and nINT/nERR - enables real-time register control, fault reporting, and sequencing coordination. |
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 applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ENABLE | Digital control input | Active-high enable for full device power-up sequence including buck/boost/LDO and GPO timing. |
| FB_B1 / FB_B2 / FB_B3 | Analog feedback inputs | Remote-sense connections for BUCK1/2/3 output voltage regulation - minimizes POL voltage error due to PCB trace resistance. |
| VOUT_BST | Boost output node | 5-V regulated output; internally connected to VIO_LDO input when boost is active - eliminates need for external 5-V rail. |
| VIO_LDO | LDO input/output node | Accepts internal 5-V boost or external 1.8/3.3-V supply - configures LDO as source or pass-through for MMIC I/O domain. |
| nINT / nERR/GPO2 / VMON1/GPO1 | Multi-function digital I/O | Configurable as interrupt, error flag, general-purpose output, or voltage monitor - supports system-level fault signaling and sequencing control. |
| SCK_SPI / SDI_SPI / SDO_SPI / CS_SPI/WD_DIS | SPI interface signals | Full-duplex SPI with watchdog disable option - enables register read/write, fault logging, and safety-critical configuration updates. |
| SYNCCLKIN | External clock input | Accepts external synchronization signal to align switching clocks - reduces EMI in multi-radar modules. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable startup/shutdown sequencing | Enables precise timing of buck/boost/LDO activation and GPO-driven external regulators or reset lines - avoids supply contention in multi-rail radar SoMs. |
| Remote voltage sensing on all bucks | Compensates for IR drop between regulator output and MMIC power pins - maintains ±1% output accuracy at point-of-load under dynamic load. |
| High-frequency PWM mode forcing | Locks buck regulators into fixed-frequency PWM (not PFM) - ensures predictable spectral content and minimal RF interference near 77/79 GHz bands. |
| Integrated functional safety monitors | Real-time OV/UV detection on input, outputs, and one external rail plus Q&A watchdog - satisfies diagnostic coverage requirements for ASIL-C system integration. |
| Thermal warning and protection | Provides early overtemperature alert via nINT before shutdown - allows host MCU to throttle radar processing preemptively. |
Applications
| Short-Range Corner Radar | Long-Range Front Radar |
|---|---|
|
Use Scenario: Compact 24-GHz or 77-GHz radar module mounted at vehicle corners for blind-spot detection and cross-traffic alert. IC Role / Device Role / Timing Role: Primary power manager supplying core (0.8–0.9 V), analog (1.2 V), and I/O (1.8 V) rails to AWR1843 or IWR6843 MMICs with synchronized startup. Use Value: High-frequency buck operation (17.6 MHz) minimizes output capacitance and board area while remote sensing ensures stable core voltage under pulsed transmit loads. |
Use Scenario: High-power 77-GHz front-facing radar unit for adaptive cruise control and automatic emergency braking. IC Role / Device Role / Timing Role: Delivers tightly regulated 0.82-V BUCK3, 1.1-V BUCK2, and 1.8-V LDO rails to IWR6843 with thermal-aware sequencing and fault reporting via SPI. Use Value: Integrated OV/UV monitoring and BIST reduce need for external supervision circuitry - simplifying ASIL-B/C system-level diagnostics. |
| Ultra-Short Range Radar | Low-Ripple Industrial Radar |
|
Use Scenario: Occupancy sensing or gesture recognition radar embedded in cabin ceiling or door panels. IC Role / Device Role / Timing Role: Powers low-power AWR1443 MMIC using 8.8-MHz bucks and 3.3-V LDO, with ENABLE-controlled sleep/wake transitions. Use Value: Programmable slew rate control prevents inrush current during wake-up - avoiding brownout of shared 3.3-V system bus. |
Use Scenario: Industrial level-sensing or motion-detection radar operating in factory environments with strict EMI limits. IC Role / Device Role / Timing Role: Provides ultra-low-noise 0.9-V core supply and 5-V analog bias via boost, with SYNCCLKIN locking to master system clock. Use Value: External clock synchronization eliminates beat frequencies between multiple radar units - critical for coherent multi-sensor fusion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail radar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP877452A7RXVRQ1 | Includes all three bucks + 5-V boost + 1.8/3.3-V LDO (same as LP877442A9RXVRQ1) but configured with 4.4-MHz base switching frequency and full-performance BOM option. | Optimized for non-radar applications requiring lower EMI and relaxed transient response - less suitable for 77-GHz front radar where 17.6-MHz operation is preferred. | Select LP877452A7RXVRQ1 only if system EMI constraints outweigh RF performance needs and 4.4-MHz operation meets load transient requirements. |
| LP877432A8RXVRQ1 | Omits the 5-V boost converter and integrated LDO - provides only three bucks (3 A each) with 17.6-MHz capability and same functional safety features. | Requires external 5-V supply and separate LDO for MMIC I/O - increases BOM count and layout complexity but reduces thermal load in space-constrained modules. | Choose LP877432A8RXVRQ1 when board area permits discrete 5-V generation and thermal budget is tight; otherwise LP877442A9RXVRQ1 offers higher integration. |
Compared with LP877452A7RXVRQ1 and LP877432A8RXVRQ1, the LP877442A9RXVRQ1 uniquely combines 17.6-MHz buck operation, integrated 5-V boost, and dual-voltage LDO in a single AEC-Q100 Grade 1 package - making it the optimal choice for space- and noise-constrained 77-GHz automotive radar designs requiring minimal external components.
Availability
LP877442A9RXVRQ1 is available at Aetrix Electronics and suitable for short-range corner radar, long-range front radar, and ultra-short range occupancy sensing applications requiring stable component supply, automotive-grade lifecycle assurance, and functional safety documentation support.
Supply support for LP877442A9RXVRQ1 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 is engineered specifically for AWR and IWR millimeter-wave radar sensors, delivering high-efficiency, low-noise, functionally safe power conversion in compact automotive-qualified packages.
FAQ
What is the primary application target for the LP877442A9RXVRQ1?
The LP877442A9RXVRQ1 is purpose-built for automotive radar sensors - specifically powering AWR and IWR MMICs in short-range corner, long-range front, and ultra-short range radar modules. Its 17.6-MHz buck capability, remote sensing, and functional safety features directly address RF noise sensitivity, point-of-load accuracy, and ASIL-C system requirements in 77-GHz radar designs. The LP877442A9RXVRQ1 integrates all required rails - including 5-V boost and configurable LDO - eliminating external power components.
Does the LP877442A9RXVRQ1 support external clock synchronization?
Yes, the LP877442A9RXVRQ1 supports external clock synchronization via the SYNCCLKIN pin. This feature allows the device's buck converters to lock to a system master clock, reducing beat frequencies and EMI in multi-radar vehicle architectures. When enabled, synchronization improves spectral cleanliness critical for coherent radar fusion - a capability confirmed in the device's electrical characteristics and pin function table for LP877442A9RXVRQ1.
How does the LP877442A9RXVRQ1 implement functional safety compliance?
The LP877442A9RXVRQ1 implements functional safety through input/output overvoltage and undervoltage monitoring, Q&A watchdog, level/PWM error signal monitor (ESM), built-in self-test (BIST), and CRC validation - all documented for ISO 26262 system design up to ASIL-C. These features are silicon-verified and enabled by default in the LP877442A9RXVRQ1's OTP configuration, providing diagnostic coverage without requiring external supervision circuits.
What output voltage options does the integrated LDO in the LP877442A9RXVRQ1 support?
The integrated LDO in the LP877442A9RXVRQ1 supports two factory-programmed output voltages: 1.8 V or 3.3 V, selectable via OTP configuration. It delivers up to 150 mA and is powered from the internal 5-V boost converter - making it ideal for supplying I/O domains of AWR/IWR radar MMICs. The VIO_LDO pin serves as both LDO output and external supply input, enabling flexible system-level power architecture in the LP877442A9RXVRQ1.
Is remote voltage sensing available on all buck regulators of the LP877442A9RXVRQ1?
Yes, remote voltage sensing is supported on all three buck regulators (BUCK1, BUCK2, BUCK3) of the LP877442A9RXVRQ1 via dedicated FB_B1, FB_B2, and FB_B3 pins. This feature compensates for IR drop between the regulator output and the MMIC power pin, ensuring ±1% output voltage accuracy at the point-of-load under dynamic current conditions - a key requirement verified in the LP877442A9RXVRQ1's production test and application notes.
LP877442A9RXVRQ1 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)
LP877442A9RXVRQ1 FAQ
1.How can I place an order for LP877442A9RXVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP877442A9RXVRQ1 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 LP877442A9RXVRQ1 reliable?
The price and inventory of LP877442A9RXVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP877442A9RXVRQ1 is usually 5 days.
3.What payment methods are accepted for LP877442A9RXVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP877442A9RXVRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP877442A9RXVRQ1?
LP877442A9RXVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP877442A9RXVRQ1 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 LP877442A9RXVRQ1?
For technical support, including LP877442A9RXVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP877442A9RXVRQ1 requirements.
6.How does Aetrix verify that LP877442A9RXVRQ1 is sourced from the original manufacturer or authorized distributors?
All LP877442A9RXVRQ1 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 LP877442A9RXVRQ1 meets industry standards.
7.What is the process for return or replacement of LP877442A9RXVRQ1?
All LP877442A9RXVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP877442A9RXVRQ1, 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 LP877442A9RXVRQ1 part is unused and in its original packaging.
Return procedure for LP877442A9RXVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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