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Texas Instruments LP873300RHDTQ1
- Part No.:
- LP873300RHDTQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LP873300RHDTQ1.pdf
- Description:
- IC REG QUAD BUCK/LNR 2MHZ 28VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,950
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Product details
Overview
LP873300RHDTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive power management IC integrating two high-current synchronous buck converters (3 A per phase, 2 MHz) and two linear regulators (300 mA each), all in a single 5-mm × 5-mm VQFN-28 package with wettable flanks. It delivers precise, configurable voltage regulation for SoC cores, memory, and peripherals in head units, camera modules, and radar ECUs.
For engineers reviewing the LP873300RHDTQ1 datasheet, LP873300RHDTQ1 pinout, LP873300RHDTQ1 application, or LP873300RHDTQ1 equivalent, this device supports I²C-controlled dual-phase or independent buck operation, remote differential feedback, programmable slew rate (0.5–10 mV/µs), spread-spectrum EMI reduction, and integrated overtemperature/overvoltage/short-circuit protection - critical for functional-safety-compliant automotive power design.
Technical Context
The LP873300RHDTQ1 implements a dual-buck architecture supporting both independent single-phase operation and synchronized dual-phase mode with automatic phase adding/shedding (1000 mA add / 650 mA shed thresholds) and current balancing (<10% mismatch). Its analog front-end includes remote sensing capability for Buck 0 in dual-phase configuration and dedicated feedback pins (FB_B0, FB_B1) with ±20 mV DC accuracy at 1 V output.
Digital control is handled via an I²C interface (up to 3.4 MHz High-Speed mode) with programmable interrupt masking, PGOOD timing (800 µs gating), and GPO/GPO2 signals synchronized to EN. The device integrates a PLL for external clock synchronization (1–24 MHz input) and supports forced PWM, AUTO (PWM/PFM), and spread-spectrum modes to optimize efficiency across load ranges from 10 mA to 6 A total output.
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/5 V rails or battery-supervised supplies. |
| Buck Output Voltage | 0.7 V to 3.36 V programmable in 5–20 mV steps - supports core voltages for modern ADAS SoCs and image signal processors. |
| Max Buck Output Current | 3 A per phase (6 A total in dual-phase) - sufficient for multi-core processors and high-speed interfaces without external current sharing. |
| LDO Output Voltage | 0.8 V to 3.3 V programmable in 0.1 V steps - provides low-noise (82 µVrms), high-PSRR (53 dB @ 10 kHz) bias for analog sensors and SerDes PHYs. |
| Switching Frequency | 1.8–2.2 MHz (typ. 2 MHz) - allows compact 0.47 µH inductors and reduces EMI fundamental frequency above AM band. |
| Thermal Rating | AEC-Q100 Grade 1 (−40°C to +125°C ambient); junction limit +140°C with thermal shutdown at +150°C - validated for under-hood and dashboard mounting. |
| I²C Interface Speed | Supports Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes - enables fast dynamic voltage scaling and real-time fault reporting. |
Pinout & Package
LP873300RHDTQ1 uses a 28-pin VQFN package (5.00 mm × 5.00 mm) with exposed thermal pad, wettable flanks for automated optical inspection (AOI), and optimized thermal resistance (RθJA = 36.7°C/W, RθJB = 8.9°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_B0, VIN_B1 | Buck input power supply pins | Separate inputs for each buck stage; must be externally tied together and locally bypassed - prevents cross-regulator coupling during transients. |
| SW_B0, SW_B1 | Buck switch node outputs | Connect to external inductors; floating if unused - requires careful layout to minimize EMI and switching losses. |
| FB_B0, FB_B1 | Voltage feedback inputs | FB_B0 senses positive output; FB_B1 serves as negative sense in dual-phase - enables remote differential sensing to correct PCB IR drop at point-of-load. |
| VOUT_LDO0, VOUT_LDO1 | LDO regulated outputs | Deliver up to 300 mA each with 200 mV dropout - suitable for noise-sensitive analog circuits requiring stable bias independent of buck ripple. |
| EN | Global enable input | Active-high logic control with internal pull-down; initiates synchronized startup/shutdown sequencing including GPO timing - essential for controlled power-up of complex subsystems. |
| nINT, PGOOD, GPO, CLKIN | Digital I/O signals | nINT is open-drain interrupt; PGOOD is push-pull power-good; GPO/CLKIN are configurable - enables system-level fault handling, status monitoring, and clock synchronization without external logic. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-phase buck with auto phase add/shed | Dynamic reconfiguration between 1- and 2-phase operation based on load (1000 mA add / 650 mA shed), maintaining >85% efficiency from 10 mA to full load. |
| Programmable output slew rate | Seven-step setting (0.47–10 mV/µs) limits inrush current and overshoot during voltage transitions - critical for avoiding reset events in sensitive digital loads. |
| Remote differential feedback | Uses FB_B0/FB_B1 pair in dual-phase mode to measure voltage directly at point-of-load, compensating for PCB trace resistance and ensuring ±0.5% regulation accuracy. |
| Spread-spectrum & phase interleaving | Reduces peak EMI by spreading switching energy across frequency band and offsetting buck phases by 180° - simplifies compliance with CISPR 25 Class 5 radiated emissions limits. |
| Integrated protection suite | Includes overtemperature warning (125°C), shutdown (150°C), buck/LDO short-circuit detection (280–450 mV threshold), and VANA OVP/UVLO - eliminates need for external supervisors in ASIL-B designs. |
Applications
| Automotive Head Unit Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers application processor, DDR memory, display interface, and audio codec in infotainment head units with strict thermal and EMI constraints. IC Role / Device Role / Timing Role: Primary PMIC delivering multiple regulated rails; manages sequencing via EN and GPO signals; synchronizes switching to avoid interference with RF receivers. Use Value: Dual-phase buck supplies 1.1 V @ 4 A to SoC with <±20 mV DC accuracy and <5 mVp-p ripple; LDOs provide clean 1.8 V/3.3 V for HDMI PHY and touch controller. |
Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera modules mounted near vehicle exterior. IC Role / Device Role / Timing Role: Single-chip power solution with AEC-Q100 qualification; handles cold-crank (4.5 V min) and load-dump (6 V max) conditions; supports rapid wake-from-standby. Use Value: 300 mA LDOs deliver ultra-low-noise 2.8 V for CMOS image sensor analog core; buck converters maintain 1.2 V @ 2 A for ISP with <55 mV transient response to burst-mode exposure changes. |
| Radar System ECU | Instrument Cluster Display |
Use Scenario: Powers millimeter-wave radar SoC, ADCs, and CAN transceivers in front/rear radar ECUs operating in high-temperature engine bay environments. IC Role / Device Role / Timing Role: High-reliability power manager with thermal warning (125°C) and shutdown (150°C); supports external clock sync to radar chirp timing for deterministic EMI placement. Use Value: Dual-phase buck delivers 1.0 V @ 6 A to radar processor with remote sensing to hold regulation within ±1% across 150 mm PCB traces; 2-MHz switching avoids interference with 77 GHz RF front-end. |
Use Scenario: Supplies TFT-LCD driver, microcontroller, and backlight LED controller in digital instrument clusters with variable brightness and wide temperature range. IC Role / Device Role / Timing Role: Multi-rail regulator with programmable startup delays; GPO controls backlight enable; PGOOD confirms rail stability before MCU boot. Use Value: LDOs provide 3.3 V @ 300 mA for MCU I/O with 53 dB PSRR suppressing buck ripple; buck converters generate 5 V @ 3 A for display backlight with spread-spectrum mode reducing audible coil whine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65910A3RSLR | Single 3-A buck + 3 LDOs; no dual-phase capability; lower max buck output (1.54 V); I²C only (no external clock sync) | Suitable for lower-power clusters or telematics; lacks radar-grade current capacity and remote sensing | Select when system load < 3 A and EMI requirements are less stringent; verify thermal performance at 125°C ambient. |
| MAX20010BATG/V+T | Dual 3-A bucks with integrated FETs but no LDOs; supports 2.2-MHz switching; no remote sensing or programmable slew rate | Better for cost-sensitive ADAS cameras needing only buck rails; requires external LDOs for analog bias | Choose when LDO integration is unnecessary and board space permits discrete LDO placement; confirm UVLO matches vehicle battery profile. |
Compared with TPS65910A3RSLR and MAX20010BATG/V+T, the LP873300RHDTQ1 uniquely combines dual-phase buck scalability, integrated LDOs with low noise, remote differential sensing, and programmable slew control - making it optimal for high-performance, thermally constrained automotive ECUs where rail count, accuracy, and EMI coexistence are critical.
Availability
LP873300RHDTQ1 is available at Aetrix Electronics and suitable for automotive head unit, camera module, radar ECU, instrument cluster, and surround-view system applications requiring stable component supply, long-term lifecycle support, and AEC-Q100 compliance.
Supply support for LP873300RHDTQ1 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 automotive ICs, with decades of experience in high-reliability power management solutions.
The LP8733xx-Q1 product line was designed specifically for automotive ADAS and infotainment systems, emphasizing AEC-Q100 Grade 1 operation, functional safety readiness (ISO 26262 support), and integrated EMI mitigation for radar/camera coexistence.
FAQ
What is the maximum total output current capability of the LP873300RHDTQ1?
The LP873300RHDTQ1 supports up to 3 A per buck converter, enabling 6 A total in dual-phase configuration. Each LDO delivers up to 300 mA. Total sustained output depends on thermal design: at +85°C ambient with 2-layer PCB, dual-phase operation sustains ≥5.2 A combined buck output while maintaining <140°C junction temperature. The LP873300RHDTQ1 datasheet specifies ILIM FWD programmable from 1.5 A to 4 A per phase, with 6 A achievable under optimal cooling.
Does the LP873300RHDTQ1 support remote voltage sensing for both buck converters?
No - remote differential feedback is supported only for Buck 0 in dual-phase configuration, using FB_B0 (positive) and FB_B1 (negative) pins. In independent single-phase mode, FB_B1 serves as the positive feedback for Buck 1. The LP873300RHDTQ1 does not provide separate remote sense pairs for both converters simultaneously; this architecture prioritizes precision regulation at the primary load (e.g., SoC core) while maintaining simplicity for secondary rails.
How does the LP873300RHDTQ1 handle power sequencing between its multiple outputs?
The LP873300RHDTQ1 implements programmable startup/shutdown delays and sequences via I²C registers and EN pin synchronization. GPO signals can be timed relative to EN assertion, enabling controlled ramp-up of LDOs before bucks or staggered buck activation. The LP873300RHDTQ1 does not include hardware-only sequencing; all timing is register-configurable, allowing flexible ordering (e.g., LDOs first → Buck 0 → Buck 1) with delays adjustable in 1-ms increments.
Can the LP873300RHDTQ1 operate without an external crystal or oscillator?
Yes - the LP873300RHDTQ1 includes an internal RC oscillator for basic operation, eliminating need for external timing components. However, for EMI-sensitive applications like radar or camera systems, the LP873300RHDTQ1 supports external clock synchronization (1–24 MHz) via CLKIN pin to align switching edges and reduce beat frequencies. Using the internal oscillator yields typical 2-MHz switching; external sync improves jitter control and enables deterministic spectral shaping.
What protection features are integrated into the LP873300RHDTQ1?
The LP873300RHDTQ1 integrates overtemperature warning (115–135°C, configurable), thermal shutdown (140–160°C), VANA overvoltage (5.6–6.1 V) and undervoltage lockout (2.51–2.75 V), buck short-circuit detection (280–440 mV), LDO short-circuit detection (190–450 mV), and output overvoltage/undervoltage monitoring with 3–4% hysteresis. All protections trigger autonomous responses (e.g., shutdown, current limiting) and report status via nINT pin - no host intervention required for fault containment.
LP873300RHDTQ1 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:
- 0.7V ~ 3.36V, 3A
- Voltage/Current - Output 2:
- 0.7V ~ 3.36V, 3A
- Voltage/Current - Output 3:
- 0.8V ~ 3.3V, 300mA
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 2.5V ~ 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)
LP873300RHDTQ1 FAQ
1.How can I place an order for LP873300RHDTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LP873300RHDTQ1 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 LP873300RHDTQ1 reliable?
The price and inventory of LP873300RHDTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP873300RHDTQ1 is usually 5 days.
3.What payment methods are accepted for LP873300RHDTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP873300RHDTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP873300RHDTQ1?
LP873300RHDTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP873300RHDTQ1 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 LP873300RHDTQ1?
For technical support, including LP873300RHDTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP873300RHDTQ1 requirements.
6.How does Aetrix verify that LP873300RHDTQ1 is sourced from the original manufacturer or authorized distributors?
All LP873300RHDTQ1 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 LP873300RHDTQ1 meets industry standards.
7.What is the process for return or replacement of LP873300RHDTQ1?
All LP873300RHDTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LP873300RHDTQ1, 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 LP873300RHDTQ1 part is unused and in its original packaging.
Return procedure for LP873300RHDTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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