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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

Texas Instruments LP873345RHDR

Name: LP873345RHDR
Brand: Texas Instruments
SKU: LP873345RHDR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LP873345RHDR

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - Linear + Switching

Package:: 28-VFQFN Exposed Pad

Datasheet:: LP873345RHDR.pdf

Description:: IC POWER

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Product details

Overview

LP873345RHDR from Texas Instruments is a dual high-current buck converter and dual linear regulator IC designed for industrial power management. It delivers up to 3 A per buck phase (6 A in dual-phase mode), supports 0.7–3.36 V programmable buck output and 0.8–3.3 V LDO output, operates from –40°C to +125°C ambient, and integrates I²C control, remote differential feedback, and spread-spectrum EMI reduction for test-and-measurement and industrial appliance applications.

For engineers reviewing the LP873345RHDR datasheet, LP873345RHDR pinout, LP873345RHDR application, or LP873345RHDR equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, real-world application mappings, and two rigorously cross-checked alternative parts for industrial-grade power sequencing and POL regulation.

Technical Context

The LP873345RHDR implements a configurable dual-buck architecture supporting both independent single-phase operation and synchronized dual-phase operation with automatic phase adding/shedding. Its integrated analog front-end enables remote differential voltage sensing for precise point-of-load regulation, while its programmable slew rate (0.47–10 mV/µs) and 2-MHz switching frequency with spread-spectrum modulation reduce EMI in noise-sensitive industrial environments.

Control is delivered via an I²C-compatible interface (supporting Standard, Fast, Fast+, and High-Speed modes up to 3.4 MHz) and hardware enable signal, with programmable PGOOD, interrupt masking, GPO/GPO2 outputs, and comprehensive protection including overtemperature warning (115–147°C), thermal shutdown (140–160°C), buck short-circuit detection (280–440 mV), and LDO short-circuit detection (190–450 mV).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.8 V to 5.5 V for buck regulators; 2.5 V to 5.5 V for LDOs - supports wide-input industrial rails including 3.3 V and 5 V supplies.
Buck Output Current	3 A per phase (6 A total in dual-phase mode) - enables high-efficiency local power delivery to FPGAs, ADCs, or microcontrollers without external current sharing.
LDO Output Current	300 mA per LDO - sufficient for low-noise analog circuitry, sensors, or reference voltage generation.
Switching Frequency	1.8–2.2 MHz (typ. 2 MHz) - allows use of compact 0.47 µH inductors and reduces output capacitor size while maintaining PWM/PFM auto-mode efficiency across load range.
Output Voltage Accuracy	±2% for buck outputs ≥1 V; ±20 mV for <1 V - ensures stable core voltage regulation under varying line/load conditions.
Thermal Performance	R_θJA = 36.7°C/W (VQFN-28) - requires minimal PCB copper area for thermal management in sealed industrial enclosures.
I²C Timing Support	Up to 3.4 MHz High-Speed mode (Cb ≤ 100 pF) - enables fast register configuration and dynamic voltage scaling during system boot or reconfiguration.

Pinout & Package

LP873345RHDR 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 performance.

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; support shared 2.8–5.5 V rail.
SW_B0 / SW_B1	Buck switch node outputs	Connect to external inductor; floating if corresponding buck is disabled - critical for EMI layout and thermal dissipation.
FB_B0 / FB_B1	Buck feedback inputs	FB_B0: positive feedback for Buck 0; FB_B1: positive for Buck 1 (single-phase) or negative return for Buck 0 (dual-phase) - enables remote differential sensing.
VOUT_LDO0 / VOUT_LDO1	LDO regulated outputs	Programmable 0.8–3.3 V outputs; floating if unused - suitable for analog sensor bias or low-noise clock buffers.
EN	Enable input	Active-high logic control; floating disables all regulators - used for system-level power sequencing and fault recovery.
nINT	Open-drain interrupt output	Active-low signal indicating fault (OVP, UVLO, thermal, PGOOD failure); requires external pullup - simplifies host MCU interrupt handling.
PGOOD	Power-good indicator	Push-pull or open-drain output signaling valid buck/LDO output within ±2% tolerance - used for downstream enable chaining.
SCL / SDA	I²C interface pins	Support 100 kHz–3.4 MHz operation; require external pullups - enable full register access for dynamic voltage/frequency scaling and telemetry.

Key Features

Feature	Design Value
Auto phase add/shed	Transitions between 1- and 2-phase buck operation at 650 mA (shed) and 1000 mA (add) - maintains >85% efficiency from 10 mA to full load without manual mode switching.
Programmable slew rate	Configurable 0.47–10 mV/µs via register bits - prevents overshoot during startup/voltage change and limits inrush current into large POL capacitors.
Dual-phase remote sensing	Differential feedback across buck phases - compensates for IR drop between regulator and load, improving output accuracy to ±0.5% at point-of-load.
Spread-spectrum & interleaving	Reduces peak EMI by >10 dB compared to fixed-frequency operation - meets CISPR 11 Class B requirements in compact industrial modules.
Comprehensive protection	Includes overvoltage (39–64 mV above setpoint), undervoltage (–53 to –29 mV), short-circuit (280–440 mV buck / 190–450 mV LDO), and thermal warning/shutdown - eliminates need for external supervision ICs.

Applications

Industrial PLC Power Rails	Test Equipment Analog Front-End
Use Scenario: Powering FPGA I/O banks, ADC reference supplies, and isolated communication interfaces in modular PLC backplanes. IC Role / Device Role / Timing Role: Dual-buck provides 1.2 V/3.3 V core/I/O rails; dual-LDO delivers ultra-low-noise 2.5 V reference and 1.8 V sensor bias. Use Value: Remote sensing maintains ±0.5% output accuracy despite PCB trace resistance; 2-MHz switching minimizes filter component footprint in space-constrained DIN-rail modules.	Use Scenario: Supplying precision analog circuitry (op-amps, DACs, multiplexers) in automated test equipment with tight noise and stability requirements. IC Role / Device Role / Timing Role: LDOs supply low-ripple bias voltages; buck converters power digital control logic and display drivers. Use Value: 82 µV_rms LDO noise and 53 dB PSRR at 10 kHz ensure measurement integrity; programmable PGOOD enables safe power-up sequencing before analog calibration.
Industrial Appliance Motor Control	Embedded Vision System Power
Use Scenario: Providing isolated gate driver supplies and MCU core voltage in washing machine or HVAC motor inverters operating in high-temperature cabinets. IC Role / Device Role / Timing Role: Buck converters deliver 5 V for gate drivers and 1.2 V for ARM Cortex-M7 MCU; LDOs power current-sense amplifiers. Use Value: –40°C to +125°C ambient rating and thermal shutdown (140–160°C) ensure reliability in sealed enclosures; auto phase shedding extends efficiency at partial load during standby cycles.	Use Scenario: Powering image sensor, ISP, and DDR memory subsystems in factory-floor vision inspection systems requiring rapid boot and low EMI. IC Role / Device Role / Timing Role: Dual-buck supplies 1.1 V core and 1.8 V I/O; LDOs provide clean 3.3 V for MIPI CSI-2 interface and 2.8 V for sensor analog block. Use Value: Spread-spectrum mode suppresses switching noise near image sensor clock frequencies; I²C programmability enables dynamic voltage scaling during different imaging modes.

Industrial PLC Power Rails

Test Equipment Analog Front-End

Use Scenario: Powering FPGA I/O banks, ADC reference supplies, and isolated communication interfaces in modular PLC backplanes.

IC Role / Device Role / Timing Role: Dual-buck provides 1.2 V/3.3 V core/I/O rails; dual-LDO delivers ultra-low-noise 2.5 V reference and 1.8 V sensor bias.

Use Value: Remote sensing maintains ±0.5% output accuracy despite PCB trace resistance; 2-MHz switching minimizes filter component footprint in space-constrained DIN-rail modules.

Use Scenario: Supplying precision analog circuitry (op-amps, DACs, multiplexers) in automated test equipment with tight noise and stability requirements.

IC Role / Device Role / Timing Role: LDOs supply low-ripple bias voltages; buck converters power digital control logic and display drivers.

Use Value: 82 µV_rms LDO noise and 53 dB PSRR at 10 kHz ensure measurement integrity; programmable PGOOD enables safe power-up sequencing before analog calibration.

Industrial Appliance Motor Control

Embedded Vision System Power

Use Scenario: Providing isolated gate driver supplies and MCU core voltage in washing machine or HVAC motor inverters operating in high-temperature cabinets.

IC Role / Device Role / Timing Role: Buck converters deliver 5 V for gate drivers and 1.2 V for ARM Cortex-M7 MCU; LDOs power current-sense amplifiers.

Use Value: –40°C to +125°C ambient rating and thermal shutdown (140–160°C) ensure reliability in sealed enclosures; auto phase shedding extends efficiency at partial load during standby cycles.

Use Scenario: Powering image sensor, ISP, and DDR memory subsystems in factory-floor vision inspection systems requiring rapid boot and low EMI.

IC Role / Device Role / Timing Role: Dual-buck supplies 1.1 V core and 1.8 V I/O; LDOs provide clean 3.3 V for MIPI CSI-2 interface and 2.8 V for sensor analog block.

Use Value: Spread-spectrum mode suppresses switching noise near image sensor clock frequencies; I²C programmability enables dynamic voltage scaling during different imaging modes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-buck + dual-LDO power management applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS65218D0RSLR	Single 3-A buck + 3 LDOs; no dual-phase capability; lower max ambient (105°C); I²C only (no GPO/GPO2)	Targeted at AM335x/AM437x Sitara SoCs; lacks remote sensing and programmable slew rate	Choose when SoC-specific integration and lower cost outweigh dual-phase efficiency and advanced sequencing needs.
LP873225RHDR	Same LP8733 family; identical pinout and package; differs only in factory-programmed default register settings (e.g., startup sequence, PGOOD delay)	Functionally identical for most industrial applications; minor differences in out-of-box behavior only	Choose LP873225RHDR only if specific preconfigured timing or enable logic matches legacy design requirements.

Compared with TPS65218D0RSLR, LP873345RHDR delivers higher current density, dual-phase efficiency optimization, and superior thermal robustness for extended ambient operation; versus LP873225RHDR, it offers identical hardware functionality with distinct factory defaults-making LP873345RHDR the preferred choice for new designs requiring maximum flexibility in sequencing and protection configuration.

Availability

LP873345RHDR is available at Aetrix Electronics and suitable for industrial PLCs, test-and-measurement instruments, and industrial appliance motor control systems requiring stable component supply, long-term lifecycle assurance, and guaranteed traceable sourcing.

Supply support for LP873345RHDR 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 decades of industrial-grade reliability validation and broad automotive/industrial qualification programs.

The LP8733xx product line was engineered specifically for demanding industrial applications-including programmable logic controllers, factory automation, and precision test equipment-where high efficiency, thermal resilience, and flexible digital control are essential for reliable 24/7 operation.

FAQ

What is the maximum junction temperature specification for LP873345RHDR?

The LP873345RHDR has a maximum junction temperature (T_J-MAX) of 150°C, with thermal shutdown triggered between 140°C and 160°C. Its R_θJA of 36.7°C/W in the VQFN-28 package enables operation up to +125°C ambient when properly mounted on a 4-layer PCB with thermal vias to internal ground planes. The device also features a programmable thermal warning threshold (115–147°C) for early system-level intervention before shutdown.

Does LP873345RHDR support external clock synchronization?

Yes, LP873345RHDR supports external clock synchronization via the CLKIN pin, accepting 1–24 MHz input clocks with ±30% accuracy tolerance. When enabled, the internal PLL locks to the external source, allowing deterministic switching timing and EMI reduction through clock harmonization with other system clocks. This feature is critical for minimizing beat frequencies in multi-rail industrial systems.

Can LP873345RHDR operate with only one buck converter enabled?

Yes, LP873345RHDR supports independent single-phase operation for each buck regulator. Pins VIN_B0/SW_B0/FB_B0 and VIN_B1/SW_B1/FB_B1 can be configured separately via I²C registers. Unused buck sections may be disabled entirely, reducing quiescent current to 9 µA in standby mode. The device retains full LDO, GPO, and monitoring functionality regardless of buck configuration.

What protection features are integrated into LP873345RHDR?

LP873345RHDR integrates overtemperature warning (115–147°C) and shutdown (140–160°C), overvoltage (39–64 mV above setpoint) and undervoltage lockout (2.51–2.75 V on VANA), buck short-circuit detection (280–440 mV), LDO short-circuit detection (190–450 mV), and programmable current limiting (1.5–4 A per phase). All protections trigger nINT assertion and can be individually masked via I²C.

Is LP873345RHDR pin-compatible with other devices in the LP8733xx family?

Yes, all LP8733xx variants-including LP873345RHDR, LP873325RHDR, and LP873315RHDR-are fully pin-compatible in the 28-pin VQFN (RHD) package. Differences exist only in factory-programmed default register values (e.g., startup sequence, PGOOD delay, phase configuration), not in pin function, electrical characteristics, or thermal behavior. Firmware updates can often align behavior across variants.

LP873345RHDR 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) Synchronous (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:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 28-VQFN (5x5)

LP873345RHDR FAQ

1.How can I place an order for LP873345RHDR through Aetrix?

Please submit a Request for Quotation (RFQ) for LP873345RHDR 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 LP873345RHDR reliable?

The price and inventory of LP873345RHDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP873345RHDR is usually 5 days.

3.What payment methods are accepted for LP873345RHDR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP873345RHDR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LP873345RHDR?

LP873345RHDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LP873345RHDR 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 LP873345RHDR?

For technical support, including LP873345RHDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP873345RHDR requirements.

6.How does Aetrix verify that LP873345RHDR is sourced from the original manufacturer or authorized distributors?

All LP873345RHDR 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 LP873345RHDR meets industry standards.

7.What is the process for return or replacement of LP873345RHDR?

All LP873345RHDR units undergo pre-shipment inspection (PSI). If there is an issue with LP873345RHDR, 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 LP873345RHDR part is unused and in its original packaging.

Return procedure for LP873345RHDR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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