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Texas Instruments LP873244RHDRQ1
- Part No.:
- LP873244RHDRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LP873244RHDRQ1.pdf
- Description:
- IC POWER
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LP873244RHDRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating two high-current buck converters (2 A per phase, 0.7–3.36 V output) and two linear regulators (300 mA, 0.8–3.3 V), all in a single 5-mm × 5-mm VQFN-28 package with wettable flanks. It supports dual-phase or independent single-phase buck operation, remote differential feedback, programmable slew rate (0.5–10 mV/µs), and I²C control - deployed in automotive head units, camera modules, surround-view ECUs, and radar systems.
For engineers reviewing the LP873244RHDRQ1 datasheet, LP873244RHDRQ1 pinout, LP873244RHDRQ1 application, or LP873244RHDRQ1 equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade thermal and protection specs (–40°C to +125°C ambient), real-world efficiency curves, and precise alternative part comparisons - all grounded in TI's official SNVSB63A revision JUNE 2021 documentation.
Technical Context
The LP873244RHDRQ1 implements a dual-buck architecture configurable as either two independent 2-A single-phase regulators or one 4-A dual-phase regulator with automatic phase adding/shedding (1000 mA add / 650 mA shed thresholds) and interleaved switching at 2 MHz ±10%. Its analog front-end includes remote differential sensing for Buck 0 in dual-phase mode and dedicated AGND/SGND separation to minimize noise coupling between power and signal paths.
Digital control is handled via I²C interface supporting Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes, with programmable interrupt masking, PGOOD timing (800 µs gating), and GPO/GPO2 outputs synchronized to EN. Protection features include overtemperature warning (115–135°C), shutdown (140–160°C), buck short-circuit detection (280–440 mV), and LDO current limiting (400–600 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V to 5.5 V for buck inputs (VIN_Bx/VANA); 2.5 V to 5.5 V for LDO inputs - enables direct connection to automotive 3.3 V or 5 V rails. |
| Buck Output Current | 2 A per phase (single-phase); up to 4 A total in dual-phase mode - supports high-power SoCs and image sensors without external current boosting. |
| LDO Output Current | 300 mA per LDO - sufficient for powering low-noise analog circuitry, SerDes PHYs, or MCU peripherals. |
| Switching Frequency | 1.8 MHz to 2.2 MHz (typical 2 MHz) - balances EMI performance, inductor size, and transient response in space-constrained automotive PCBs. |
| Output Voltage Accuracy | ±2% for buck outputs ≥1 V; ±20 mV for <1 V - ensures stable core voltage regulation under load and line variation. |
| Thermal Performance | RθJA = 36.7°C/W (VQFN-28); RθJB = 8.9°C/W - enables reliable operation at 125°C ambient with standard 2-layer board layout and thermal pad vias. |
| I²C Timing Support | Up to 3.4 MHz High-Speed mode (Cb ≤ 100 pF) - allows fast register configuration during boot or dynamic voltage scaling. |
Pinout & Package
LP873244RHDRQ1 is housed in a 28-pin, 5.00 mm × 5.00 mm VQFN package with wettable flanks and an exposed thermal pad connected to PCB ground plane via multiple vias for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_B0, VIN_B1 | Buck input power pins | Must be tied together externally and locally bypassed - not internally connected; supports separate routing for noise isolation. |
| SW_B0, SW_B1 | Buck switch node outputs | Connect to external inductors; floating if corresponding buck is disabled - critical for EMI filtering layout. |
| FB_B0, FB_B1 | Buck feedback inputs | FB_B0 = positive sense for Buck 0; FB_B1 = positive for Buck 1 (single-phase) or negative for Buck 0 (dual-phase) - enables remote differential sensing. |
| VOUT_LDO0, VOUT_LDO1 | LDO regulated outputs | Programmable 0.8–3.3 V; each supports 300 mA - used for low-noise analog supplies or I/O domain biasing. |
| EN | Enable input | Active-high logic control; internal pull-down enabled when EN_PD=1 - coordinates system-level power sequencing. |
| nINT | Open-drain interrupt output | Signals fault conditions (OVP, UVLO, thermal warning); requires external pull-up - simplifies host MCU interrupt handling. |
| PGOOD | Power-good indicator | Push-pull or open-drain configurable; 800 µs delay after enable - provides deterministic power-rail validation before system boot. |
| SCL, SDA | I²C serial interface | Supports 100 kHz–3.4 MHz; internal weak pull-ups disabled - requires external 10 kΩ pull-ups to VIO for robust communication. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase buck configuration | Enables 4-A output with 10% current mismatch tolerance and phase interleaving - reduces input/output ripple by >50% vs single-phase. |
| Programmable output slew rate | 0.47–10 mV/µs range (7-step setting) - prevents overshoot during startup/voltage transitions and controls inrush into large POL capacitors. |
| Remote differential feedback | Compensates IR drop between regulator output and point-of-load - improves DC accuracy to ±0.5% typical in high-current automotive traces. |
| Spread-spectrum & phase interleaving | Reduces peak EMI amplitude by spreading energy across 2-MHz fundamental and harmonics - eases CISPR-25 Class 5 compliance. |
| Configurable GPO/GPO2 signals | GPO is dedicated digital output; CLKIN doubles as GPO2 - supports custom sequencing, reset assertion, or status signaling without extra GPIOs. |
Applications
| Automotive Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC cores, DDR memory, and display interfaces in infotainment head units requiring tight voltage regulation and low EMI. IC Role / Device Role / Timing Role: Dual-buck delivers 1.1 V @ 2 A (SoC core) and 1.8 V @ 2 A (DDR), while LDOs supply 3.3 V @ 300 mA (LVDS transmitter) and 1.2 V @ 300 mA (audio codec). Use Value: Phase interleaving cuts input ripple by 70%, enabling smaller input capacitors; remote sensing maintains ±15 mV accuracy at DDR VDDQ pin despite 150-mΩ PCB trace resistance. |
Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera modules operating in harsh under-hood environments. IC Role / Device Role / Timing Role: One buck powers 1.2 V @ 1.8 A sensor core; second buck delivers 2.8 V @ 1.5 A for analog front-end; LDOs provide 1.8 V @ 300 mA (MIPI PHY) and 3.3 V @ 300 mA (lens actuator driver). Use Value: AEC-Q100 Grade 1 rating ensures reliability at 125°C ambient; programmable slew rate limits inrush during cold-start camera activation, preventing brownout of MCU rail. |
| Radar System ECU | Surround-View ECU |
Use Scenario: Provides clean, sequenced power to 77-GHz radar transceivers, DSPs, and CAN FD controllers in front-corner radar modules. IC Role / Device Role / Timing Role: Dual-phase buck generates 1.0 V @ 3.5 A for RF SoC; LDOs deliver 1.8 V @ 300 mA (ADC reference) and 3.3 V @ 300 mA (CAN transceiver) with PSRR >53 dB at 10 kHz. Use Value: Low 82 µVrms LDO noise prevents spurious tones in radar IF chain; thermal warning at 125°C triggers derating before shutdown, preserving detection integrity. |
Use Scenario: Manages power for multi-camera fusion processors, Ethernet switches, and video encoders in vehicle-wide surround-view systems. IC Role / Device Role / Timing Role: Two independent bucks supply 1.1 V @ 2 A (processor core) and 0.9 V @ 1.5 A (GPU), while LDOs feed 1.8 V @ 300 mA (GMSL deserializer) and 3.3 V @ 300 mA (USB PHY). Use Value: I²C Fast+ mode (1 MHz) enables sub-100-µs voltage reconfiguration during camera stream switching; GPO synchronizes power-on reset with Ethernet PHY initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LP873324RHDRQ1 | Same pinout and feature set but with enhanced spread-spectrum modulation and tighter buck DC accuracy (±1.5% vs ±2%) | Preferred for new designs targeting stricter CISPR-25 radiated emissions or higher-precision core voltage requirements | Select LP873324RHDRQ1 when EMI margin is critical or when SoC voltage tolerance is <±20 mV at 1.1 V. |
| TPS65910A3RSLR | 10-channel PMIC with lower buck current (1.5 A max), no dual-phase capability, and different I²C register map | Suitable for less demanding infotainment subsystems where integrated RTC, battery charger, and GPIOs outweigh need for 4-A output | Choose TPS65910A3RSLR only if existing firmware supports its register structure and system load stays below 1.5 A per buck. |
Compared with LP873244RHDRQ1, LP873324RHDRQ1 offers measurable EMI reduction and improved voltage accuracy without layout changes, while TPS65910A3RSLR trades peak current capability for broader system integration - making LP873244RHDRQ1 the optimal balance of high-current density, automotive qualification, and design flexibility for ADAS and infotainment ECUs.
Availability
LP873244RHDRQ1 is available at Aetrix Electronics and suitable for automotive head unit, camera module, and radar ECU designs requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LP873244RHDRQ1 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 leader specializing in analog, embedded processing, and power management technologies, with deep expertise in automotive-grade reliability and functional safety.
The LP8732xx-Q1 product line was engineered specifically for automotive ADAS and infotainment power architectures - delivering high-efficiency, low-noise, and thermally robust multi-rail regulation in compact packages compliant with AEC-Q100 Grade 1.
FAQ
What is the maximum supported output current for each buck converter in LP873244RHDRQ1?
The LP873244RHDRQ1 supports up to 2 A per buck converter in single-phase mode. In dual-phase configuration, it delivers up to 4 A total with automatic phase adding above 1000 mA and shedding below 650 mA. The actual achievable current depends on thermal conditions, PCB layout, and input/output voltage differentials - with typical operation sustaining 2 A per phase at 125°C ambient using recommended thermal vias and copper area.
Does LP873244RHDRQ1 support remote voltage sensing, and how is it implemented?
Yes, LP873244RHDRQ1 supports remote differential feedback for improved output accuracy. In dual-phase configuration, FB_B1 serves as the negative sense input for Buck 0, while FB_B0 remains the positive input - enabling compensation of IR drop between the regulator output and point-of-load. This configuration requires separate Kelvin traces from the load back to the FB pins and is validated to maintain ±15 mV accuracy even with 150-mΩ trace resistance.
What protection features does LP873244RHDRQ1 include for automotive reliability?
LP873244RHDRQ1 integrates comprehensive automotive-grade protection: overtemperature warning (115–135°C) and shutdown (140–160°C), buck short-circuit detection (280–440 mV), LDO overcurrent limiting (400–600 mA), VANA overvoltage (5.6–6.1 V) and undervoltage lockout (2.51–2.75 V), plus programmable PGOOD monitoring with 4–15 µs deglitching. All protections are hardware-based and operate independently of I²C communication.
Can LP873244RHDRQ1 synchronize its switching frequency to an external clock?
Yes, LP873244RHDRQ1 accepts an external clock input on the CLKIN pin (1–24 MHz nominal), which can be used to synchronize buck switching and reduce beat frequencies in multi-rail systems. Clock detection includes 1.8 µs missing-clock delay and 20 µs debounce; valid clock detection triggers a 600 µs internal delay before switching to external clock mode - ensuring glitch-free transition and stable operation.
What is the thermal resistance (RθJA) of LP873244RHDRQ1, and how does it impact layout?
LP873244RHDRQ1 has a junction-to-ambient thermal resistance (RθJA) of 36.7°C/W in the VQFN-28 package. This value assumes standard JEDEC 2-layer test board conditions. To achieve rated performance at 125°C ambient, designers must connect the exposed thermal pad to a solid PCB ground plane using ≥9 vias (0.3-mm diameter) and maintain ≥250 mm² copper area - reducing effective RθJA to ~15°C/W in optimized layouts and enabling full 4-A dual-phase operation.
LP873244RHDRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Topology:
- Step-Down (Buck) (2), Linear (LDO) (2)
- Number of Outputs:
- 4
- Frequency - Switching:
- 2MHz
- Voltage/Current - Output 1:
- Programmable, 0.7V ~ 3.36V, 2A
- Voltage/Current - Output 2:
- Programmable, 0.7V ~ 3.36V, 2A
- Voltage/Current - Output 3:
- Programmable, 0.7V ~ 3.36V, 2A
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- Yes
- Voltage - Supply:
- 2.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-VQFN (5x5)
LP873244RHDRQ1 FAQ
1.How can I place an order for LP873244RHDRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP873244RHDRQ1 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 LP873244RHDRQ1 reliable?
The price and inventory of LP873244RHDRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP873244RHDRQ1 is usually 5 days.
3.What payment methods are accepted for LP873244RHDRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP873244RHDRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP873244RHDRQ1?
LP873244RHDRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP873244RHDRQ1 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 LP873244RHDRQ1?
For technical support, including LP873244RHDRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP873244RHDRQ1 requirements.
6.How does Aetrix verify that LP873244RHDRQ1 is sourced from the original manufacturer or authorized distributors?
All LP873244RHDRQ1 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 LP873244RHDRQ1 meets industry standards.
7.What is the process for return or replacement of LP873244RHDRQ1?
All LP873244RHDRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP873244RHDRQ1, 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 LP873244RHDRQ1 part is unused and in its original packaging.
Return procedure for LP873244RHDRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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