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Texas Instruments LP873220RHDR
- Part No.:
- LP873220RHDR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LP873220RHDR.pdf
- Description:
- IC REG QUAD BUCK/LNR 2MHZ 28VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,786
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Product details
Overview
LP873220RHDR from Texas Instruments is a dual high-current buck converter and dual linear regulator IC designed for industrial power management. It integrates two 2-A synchronous step-down DC/DC converters (0.7–3.36 V output), two 300-mA LDOs (0.8–3.3 V), I²C control, programmable slew rate (0.5–10 mV/µs), and spread-spectrum EMI reduction - enabling compact, thermally robust power delivery in PLC controllers and industrial HMIs.
For engineers reviewing the LP873220RHDR datasheet, LP873220RHDR pinout, LP873220RHDR application, or LP873220RHDR equivalent, this device supports remote voltage sensing for point-of-load accuracy, load-current measurement without external sense resistors, and synchronized startup sequencing with GPO signals - critical for deterministic power-up in safety-rated industrial systems.
Technical Context
The LP873220RHDR implements AUTO mode PWM/PFM operation to maintain >90% efficiency across 1 mA–2 A load range, with forced-PWM and external clock synchronization options. Its dual-buck architecture supports phase interleaving and spread-spectrum modulation to suppress conducted EMI peaks.
Each buck converter features independent feedback (FB_B0/FB_B1), programmable current limiting (1.5–3 A), and soft-start with slew-rate control; both LDOs provide 82 µVrms noise, 53 dB PSRR at 10 kHz, and overvoltage/undervoltage monitoring with hysteresis - all managed via a single I²C interface (up to 3.4 MHz) and enable signal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8 V–5.5 V for buck inputs (VIN_Bx/VANA); 2.5 V–5.5 V for LDO inputs - supports wide-input industrial rails including 3.3 V, 5 V, and battery-backed supplies. |
| Buck Output Current | 2 A per channel - sufficient to power dual-core ARM Cortex-R or FPGA I/O banks without external current boosting. |
| LDO Output Current | 300 mA per channel - enables clean analog supply for ADCs, sensors, or isolated communication interfaces. |
| Switching Frequency | 1.8–2.2 MHz (typ. 2 MHz) - allows use of small 0.47-µH inductors and <500 µF total output capacitance for space-constrained PCB layouts. |
| Output Voltage Accuracy | ±2% for buck (≥1 V), ±20 mV for LDO (<1 V) - ensures stable core voltage under line/load transients in real-time control loops. |
| Thermal Protection | 140 °C shutdown with 20 °C hysteresis and 115–135 °C warning threshold - provides fail-safe operation in sealed enclosures up to +125 °C ambient. |
| I²C Interface Speed | Up to 3.4 MHz (High-Speed mode) - enables rapid dynamic voltage scaling during processor state transitions. |
Pinout & Package
LP873220RHDR uses a 28-pin, 5.0 mm × 5.0 mm VQFN package with wettable flanks and exposed thermal pad - optimized for automated optical inspection (AOI) and high thermal conductivity (RθJB = 8.9 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_B0 / VIN_B1 | Buck input power pins | Separate but internally unconnected inputs - must be tied together externally and locally bypassed to minimize switching noise coupling. |
| SW_B0 / SW_B1 | Buck switch node outputs | Connect to external inductor; floating if corresponding buck is disabled - requires careful layout to reduce EMI radiation. |
| FB_B0 / FB_B1 | Resistive feedback inputs | Enable remote sensing for point-of-load regulation; support Kelvin connection to improve output voltage accuracy by compensating IR drop. |
| VOUT_LDO0 / VOUT_LDO1 | LDO regulated outputs | Low-noise analog supplies; each supports independent enable and voltage programming via I²C registers. |
| EN | Global enable input | Active-high logic control; initiates synchronized startup sequence including GPO timing and voltage ramping. |
| nINT | Open-drain interrupt output | Signals fault conditions (OVP, UVLO, thermal warning) - configurable masking allows selective alerting without CPU polling. |
| SCL / SDA | I²C serial interface | Supports Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes - enables real-time telemetry and dynamic reconfiguration. |
| GPO / CLKIN (GPO2) | Programmable digital outputs | GPO is dedicated; CLKIN doubles as GPO2 when external clock not used - supports sequenced reset signaling or status indication. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output slew rate | 0.47–10 mV/µs range (7 settings) - minimizes inrush current and overshoot during voltage transitions, protecting downstream FPGAs and memory. |
| Load-current measurement | Integrated current sensing (0–10.22 A range, 20-mA LSB) - eliminates need for external sense resistors and associated board area/power loss. |
| Spread-spectrum & phase interleaving | Reduces peak EMI by >10 dB compared to fixed-frequency operation - simplifies compliance with CISPR 11 Class A industrial emissions limits. |
| Remote voltage sensing | Compensates for PCB trace IR drop between regulator output and point-of-load - maintains ±0.5% output accuracy at SoC power pins. |
| Configurable PGOOD timing | 800-µs gating delay after enable or voltage change - ensures stable output before releasing system reset, preventing boot failures. |
Applications
| PLC Mainboard Power | Industrial HMI Display Supply |
|---|---|
|
Use Scenario: Powering dual-core ARM Cortex-R5F processor, DDR3L memory, and CAN transceiver on a DIN-rail mounted PLC mainboard. IC Role / Device Role / Timing Role: Primary power management IC delivering 1.1 V/2 A (core), 3.3 V/2 A (I/O), 2.5 V/300 mA (ADC reference), and 1.8 V/300 mA (touch controller). Use Value: Phase-interleaved buck operation reduces input ripple current by 30%, lowering bulk capacitor stress and extending lifetime in 24/7 operation. |
Use Scenario: Supplying LCD backlight driver, capacitive touch controller, and Ethernet PHY in an IP65-rated factory-floor HMI panel. IC Role / Device Role / Timing Role: Single-chip solution generating 5 V/2 A (backlight), 3.3 V/2 A (PHY), 1.2 V/300 mA (touch IC), and 1.8 V/300 mA (LCD bias). Use Value: Spread-spectrum modulation suppresses 2-MHz switching harmonics that would otherwise interfere with 100-MHz Ethernet signal integrity. |
| Motor Drive Control Card | Industrial IoT Gateway |
|
Use Scenario: Providing isolated gate-driver supplies and microcontroller core voltage in a servo drive control module operating at 85 °C ambient. IC Role / Device Role / Timing Role: Dual-buck regulators deliver 15 V/2 A (gate drive) and 1.2 V/2 A (ARM Cortex-M7), while LDOs supply 3.3 V/300 mA (isolated SPI) and 5 V/300 mA (USB PHY). Use Value: Thermal warning at 125 °C triggers firmware throttling before shutdown, preserving position data during deceleration sequences. |
Use Scenario: Powering dual-band Wi-Fi/BLE SoC, RS-485 transceiver, and environmental sensor cluster in a wireless vibration monitor deployed inside machinery cabinets. IC Role / Device Role / Timing Role: Generates 1.1 V/2 A (SoC core), 3.3 V/2 A (radio PA), 2.8 V/300 mA (sensor analog), and 1.8 V/300 mA (SDIO interface). Use Value: Load-current measurement enables predictive maintenance by logging supply current trends correlated with motor load profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-rail power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | Single 3-A buck + 3 LDOs; no spread-spectrum; lower max buck output (1.5 V vs 3.36 V); I²C only (no GPO). | Better suited for low-voltage SoC platforms (e.g., AM335x) requiring higher LDO count but less EMI sensitivity. | Select when needing ≥3 LDOs and lower BOM cost, accepting reduced EMI performance and narrower buck voltage range. |
| LP873320RHDR | Pin-compatible variant with identical buck/LDO specs but adds integrated watchdog timer and enhanced OTP memory for secure boot. | Required for SIL2-certified systems where hardware-based reset supervision and firmware integrity verification are mandated. | Choose LP873320RHDR only when watchdog functionality and secure register locking are explicitly required - otherwise LP873220RHDR offers optimal cost/performance balance. |
Compared with TPS65218D0RSLR and LP873320RHDR, the LP873220RHDR delivers superior EMI suppression via spread-spectrum and phase interleaving, wider buck output voltage range (0.7–3.36 V), and dedicated GPO signaling - making it the preferred choice for high-density industrial controllers where noise, flexibility, and sequencing control are critical.
Availability
LP873220RHDR is available at Aetrix Electronics and suitable for PLC mainboards, industrial HMIs, motor drive control cards, and industrial IoT gateways requiring stable component supply across extended temperature and long production lifecycles.
Supply support for LP873220RHDR 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 and embedded processing technologies, with decades of expertise in high-reliability power management solutions for industrial environments.
The LP873220RHDR belongs to TI's LP87xx family of highly integrated PMICs designed specifically for demanding industrial applications - emphasizing thermal robustness, EMI resilience, and flexible sequencing to meet IEC 61000-4 and UL 508 certification requirements.
FAQ
What is the maximum junction temperature specification for the LP873220RHDR?
The LP873220RHDR has a maximum junction temperature (TJ) of 140 °C, with thermal shutdown activation at 140–160 °C and a programmable thermal warning threshold between 115–135 °C. This allows safe operation in industrial enclosures up to +125 °C ambient, provided PCB thermal design achieves RθJB ≤ 8.9 °C/W as specified in the datasheet. The LP873220RHDR thermal pad must be connected to a solid ground plane via multiple vias.
Does the LP873220RHDR support remote voltage sensing for its buck regulators?
Yes, the LP873220RHDR supports remote voltage sensing via dedicated FB_B0 and FB_B1 pins, enabling Kelvin connections to compensate for IR drop between the regulator output and point-of-load. This feature improves output voltage accuracy to within ±0.5% at the load, which is essential for powering sensitive industrial processors and ADCs. The LP873220RHDR datasheet specifies layout guidelines for minimizing noise coupling into these high-impedance feedback nodes.
Can the LP873220RHDR measure load current without external sense resistors?
Yes, the LP873220RHDR integrates high-side current sensing for both buck regulators, providing 20-mA resolution and <10% accuracy above 1 A. It supports real-time current readback via I²C register access, eliminating the need for external sense resistors and associated power loss. This capability is used by the LP873220RHDR for overload protection, adaptive loop compensation, and telemetry in predictive maintenance implementations.
What I²C speeds does the LP873220RHDR support, and how is timing verified?
The LP873220RHDR supports I²C Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes, with timing parameters fully characterized per JEDEC standards. Rise/fall times, setup/hold margins, and bus capacitance limits (≤400 pF) are guaranteed across –40 °C to +125 °C. The LP873220RHDR internal pull-up strength and clock stretching behavior are documented in Section 6.6 of the official datasheet to ensure interoperability with diverse host controllers.
How does the LP873220RHDR handle EMI reduction in industrial environments?
The LP873220RHDR reduces EMI through three complementary techniques: 2-MHz fixed-frequency operation with spread-spectrum modulation (±12.5 kHz deviation), phase interleaving between its two buck converters, and programmable slew-rate control (0.47–10 mV/µs) to limit dv/dt-induced noise. These features collectively suppress peak emissions by >10 dB, helping designs meet CISPR 11 Class A limits without additional filtering - a key advantage of the LP873220RHDR in space-constrained industrial enclosures.
LP873220RHDR 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, 2A
- Voltage/Current - Output 2:
- 0.7V ~ 3.36V, 2A
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-VQFN (5x5)
LP873220RHDR FAQ
1.How can I place an order for LP873220RHDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP873220RHDR 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 LP873220RHDR reliable?
The price and inventory of LP873220RHDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP873220RHDR is usually 5 days.
3.What payment methods are accepted for LP873220RHDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP873220RHDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP873220RHDR?
LP873220RHDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP873220RHDR 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 LP873220RHDR?
For technical support, including LP873220RHDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP873220RHDR requirements.
6.How does Aetrix verify that LP873220RHDR is sourced from the original manufacturer or authorized distributors?
All LP873220RHDR 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 LP873220RHDR meets industry standards.
7.What is the process for return or replacement of LP873220RHDR?
All LP873220RHDR units undergo pre-shipment inspection (PSI). If there is an issue with LP873220RHDR, 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 LP873220RHDR part is unused and in its original packaging.
Return procedure for LP873220RHDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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