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Texas Instruments LP87332DRHDT
- Part No.:
- LP87332DRHDT
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
LP87332DRHDT.pdf
- Description:
- IC REG QUAD BUCK/LNR 2MHZ 28VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,469
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Product details
Overview
LP87332DRHDT from Texas Instruments is a dual high-current buck converter and dual linear regulator IC designed for industrial power management. It integrates two 3-A DC/DC buck 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 EMI-reduction features including spread-spectrum mode and phase interleaving - deployed in point-of-load systems for programmable logic controllers and industrial HMIs.
For engineers reviewing the LP87332DRHDT datasheet, LP87332DRHDT pinout, LP87332DRHDT application, or LP87332DRHDT equivalent, this page delivers verified electrical specs, thermal metrics, I²C timing compliance, remote sensing capability, and validated alternative options for industrial-grade power sequencing and POL regulation.
Technical Context
The LP87332DRHDT implements dual synchronous buck regulators with integrated high-side/low-side FETs (RDS(on) HS: 50–110 mΩ; LS: 45–90 mΩ), operating at 1.8–2.2 MHz with AUTO (PWM/PFM) mode for wide-load efficiency. Each buck supports remote voltage sensing via dedicated FB pins to compensate IR drop at the point of load.
It pairs with two independent LDOs featuring 82 µVrms noise, 53 dB PSRR at 10 kHz, and programmable PGOOD monitoring with ±40 mV overvoltage/undervoltage thresholds. Power sequencing is managed via EN, GPO, CLKIN/GPO2, and interrupt masking - all coordinated through a register-mapped I²C interface supporting Standard, Fast, Fast+, and High-Speed modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.8–5.5 V for buck inputs (VIN_Bx/VANA); 2.5–5.5 V for LDO inputs - enables single-rail industrial supply compatibility. |
| Buck output current | 3 A per channel - supports high-power FPGA I/O banks or microcontroller cores without external current boosting. |
| LDO output current | 300 mA per channel - sufficient for analog sensor biasing, ADC reference supplies, or isolated communication interfaces. |
| Switching frequency | 1.8–2.2 MHz (typ. 2 MHz) - allows compact 0.47-µH inductors and reduces output capacitor footprint. |
| Thermal resistance | RθJA = 36.7 °C/W (VQFN-28) - supports operation up to +125°C ambient with standard PCB copper area. |
| I²C interface speed | Up to 3.4 MHz (High-Speed mode) - enables fast configuration updates during dynamic voltage scaling sequences. |
| Output voltage accuracy | ±2% for buck (≥1 V), ±20 mV for LDO (<1 V) - ensures stable core voltage under load transients in PLC backplanes. |
Pinout & Package
LP87332DRHDT uses a 28-pin, 5.0 mm × 5.0 mm VQFN package with wettable flanks and exposed thermal pad connected to PCB ground plane via multiple vias for optimal thermal performance (RθJB = 8.9 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN_B0 / VIN_B1 | Buck input power | Separate pins for each buck; must be tied externally to same supply node and locally bypassed - prevents cross-regulator coupling. |
| SW_B0 / SW_B1 | Buck switch node | Connects to external inductor; requires low-inductance layout to minimize switching losses and EMI. |
| FB_B0 / FB_B1 | Buck feedback input | Remote sense capability - connect directly to point-of-load to correct for PCB trace IR drop. |
| VOUT_LDO0 / VOUT_LDO1 | LDO regulated output | Low-noise outputs usable for precision analog circuitry; each supports independent enable and voltage programming. |
| EN | Global enable input | Active-high logic control; initiates soft-start sequence and synchronizes GPO signal timing. |
| nINT | Open-drain interrupt | Signals fault conditions (OVP, UVP, thermal warning) - requires external pullup to VANA for system-level alert handling. |
| SCL / SDA | I²C serial interface | Supports multi-device addressing and register read/write for dynamic voltage scaling and telemetry reporting. |
| GPO / CLKIN(GPO2) | Configurable digital output | GPO is dedicated; CLKIN doubles as GPO2 when external clock not used - enables flexible power sequencing signals. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output slew rate | 0.47–10 mV/µs across 7 settings - minimizes inrush current and output overshoot during startup/voltage transitions. |
| EMI reduction architecture | Spread-spectrum modulation + phase interleaving between buck channels - lowers peak radiated emissions without filter redesign. |
| Load-current measurement | Integrated current sensing (0–10.22 A range, 20-mA LSB) - eliminates need for external sense resistors and associated board space. |
| Thermal protection | Configurable die temperature warning (115–147°C) and shutdown (140–160°C) - prevents thermal runaway in enclosed industrial enclosures. |
| Power-good signaling | Programmable PGOOD gating time (800 µs) and ±40 mV OV/UV thresholds - ensures reliable system reset timing for downstream processors. |
Applications
| Programmable Logic Controller (PLC) Backplane | Industrial Human-Machine Interface (HMI) |
|---|---|
Use Scenario: Powering FPGA I/O banks, ARM Cortex-A cores, and isolated CAN/RS-485 transceivers from a 3.3-V or 5-V rail. IC Role / Device Role / Timing Role: Dual-buck/LDO PMIC provides independent, sequenced, and monitored rails with remote sensing for stable core voltages under variable load. Use Value: Eliminates discrete regulator count by 4× while maintaining <±2% output accuracy and enabling real-time current telemetry for predictive maintenance. |
Use Scenario: Supplying LCD bias, touch controller, and MCU peripherals in fanless panel PCs operating in extended temperature environments. IC Role / Device Role / Timing Role: LDOs deliver ultra-low-noise (82 µVrms) analog supplies; buck converters handle high-current backlight drivers with EMI-controlled switching. Use Value: Reduces conducted emissions below CISPR-22 Class B limits without added ferrite beads, simplifying EMC validation. |
| Factory Automation Sensor Hub | Industrial Ethernet Gateway |
Use Scenario: Powering multiple analog sensors (RTD, strain gauge), ADCs, and low-power wireless SoCs (Zigbee, LoRa) on a single 24-V-derived board. IC Role / Device Role / Timing Role: LDOs provide clean reference voltages; buck converters supply digital logic with programmable soft-start to avoid brownout during cold start. Use Value: Achieves <100-µA standby current with regulators disabled - extends battery backup runtime during mains failure. |
Use Scenario: Delivering isolated 1.2-V, 1.8-V, and 3.3-V rails to Ethernet PHYs, MAC processors, and PoE-powered subsystems in DIN-rail mounted gateways. IC Role / Device Role / Timing Role: Dual buck channels support parallel-phase operation for 6-A total; I²C interface enables firmware-controlled rail margining and fault logging. Use Value: Enables synchronized power-up of PHY and MAC to meet IEEE 802.3af timing requirements without external sequencers. |
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 + three 1-A bucks + four LDOs; no spread-spectrum; larger 48-pin VQFN (7×7 mm). | Higher integration for SoC-based gateways; lacks remote sensing and programmable slew rate. | Choose for higher total current demand (>6 A) and lower component count where board area permits larger package. |
| MAX20029ATGB/V+T | Dual 3-A buck + dual 300-mA LDO; 2.2-MHz fixed frequency; no I²C, only hardware-programmed outputs. | Pin-strapped configuration only; no telemetry or dynamic reconfiguration - suited for cost-sensitive fixed-rail designs. | Choose when firmware control and current monitoring are unnecessary and BOM cost is prioritized over flexibility. |
Compared with TPS65218D0RSLR and MAX20029ATGB/V+T, the LP87332DRHDT uniquely balances compact 5-mm VQFN size, I²C configurability, remote sensing, and EMI-aware switching - making it optimal for space-constrained, thermally demanding industrial edge nodes requiring adaptive power management.
Availability
LP87332DRHDT is available at Aetrix Electronics and suitable for programmable logic controllers, industrial HMIs, factory automation sensor hubs, and industrial Ethernet gateways requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LP87332DRHDT 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 ICs for industrial, automotive, and aerospace applications.
The LP87332DRHDT belongs to TI's LP87xx family of highly integrated PMICs engineered specifically for industrial edge devices requiring robust thermal performance, precise voltage regulation, and configurable sequencing in harsh operating environments.
FAQ
What is the maximum junction temperature specification for the LP87332DRHDT?
The LP87332DRHDT has a maximum junction temperature (TJ-MAX) of 150°C, with thermal shutdown triggered between 140°C and 160°C depending on process variation. Its RθJA of 36.7°C/W and RθJB of 8.9°C/W allow reliable operation at +125°C ambient when using appropriate PCB copper area and thermal vias beneath the exposed pad - critical for sealed industrial enclosures without forced airflow.
Does the LP87332DRHDT support remote voltage sensing for its buck regulators?
Yes, the LP87332DRHDT supports remote voltage sensing via dedicated FB_B0 and FB_B1 pins. These inputs connect directly to the point-of-load to compensate for IR drop across PCB traces, improving output voltage accuracy to ±2% even under high-current transient loads - a key requirement for powering sensitive FPGA or DSP cores in industrial control systems.
Can the LP87332DRHDT operate without an external clock source?
Yes, the LP87332DRHDT operates autonomously using its internal RC oscillator. The CLKIN pin is optional and serves either as an external synchronization input (1–24 MHz) or as a secondary general-purpose output (GPO2) when unused - providing design flexibility without requiring additional clock components in standalone industrial modules.
What protection features are integrated into the LP87332DRHDT?
The LP87332DRHDT integrates comprehensive protection: overtemperature warning/shutdown (configurable thresholds), input overvoltage/undervoltage lockout (VANA OVP/UVLO), output overvoltage/undervoltage detection (for PGOOD and interrupts), short-circuit detection for both buck and LDO outputs, and programmable current limiting (1.5–4 A per buck phase). These ensure safe operation in unattended industrial deployments.
How does the LP87332DRHDT achieve EMI reduction without external filters?
The LP87332DRHDT reduces EMI through two built-in techniques: spread-spectrum frequency modulation (dithering switching frequency) and phase interleaving between its two buck converters. Together, these lower peak spectral energy and cancel magnetic fields - enabling compliance with CISPR-22 Class B emissions limits using minimal external filtering, which is essential for compact industrial HMI designs.
LP87332DRHDT 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 28-VQFN (5x5)
LP87332DRHDT FAQ
1.How can I place an order for LP87332DRHDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LP87332DRHDT 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 LP87332DRHDT reliable?
The price and inventory of LP87332DRHDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP87332DRHDT is usually 5 days.
3.What payment methods are accepted for LP87332DRHDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP87332DRHDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP87332DRHDT?
LP87332DRHDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP87332DRHDT 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 LP87332DRHDT?
For technical support, including LP87332DRHDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP87332DRHDT requirements.
6.How does Aetrix verify that LP87332DRHDT is sourced from the original manufacturer or authorized distributors?
All LP87332DRHDT 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 LP87332DRHDT meets industry standards.
7.What is the process for return or replacement of LP87332DRHDT?
All LP87332DRHDT units undergo pre-shipment inspection (PSI). If there is an issue with LP87332DRHDT, 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 LP87332DRHDT part is unused and in its original packaging.
Return procedure for LP87332DRHDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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