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Texas Instruments LP87702KRHBR
- Part No.:
- LP87702KRHBR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP87702KRHBR.pdf
- Description:
- IC POWER
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
LP87702KRHBR from Texas Instruments is a dual-buck + 5-V boost power management IC with integrated diagnostics for functional safety applications. It delivers up to 3.5 A per buck channel (2 MHz/3 MHz/4 MHz switching), supports external voltage monitoring (VMON1/VMON2), features window watchdog with reset output (WD_RESET), and provides I²C-programmable sequencing, power-good signals (PG0/PG1), and spread-spectrum modulation. It is used in industrial safety-critical systems such as AGV safety scanners and traffic enforcement sensors.
For engineers reviewing the LP87702KRHBR datasheet, LP87702KRHBR pinout, LP87702KRHBR application, or LP87702KRHBR equivalent, key selection criteria include dual-buck current capability (3.5 A), diagnostic coverage (FMEDA/SIL-2 support), programmable startup/shutdown delays, and OTP-configured safety settings per orderable part number.
Technical Context
The LP87702KRHBR integrates two independent synchronous buck converters with auto PWM/PFM mode switching and a dedicated 5-V/600-mA boost converter. Its diagnostic architecture includes two analog voltage monitoring inputs (VMON1/VMON2), a window watchdog with active-low reset output (WD_RESET), and dedicated reference voltage generation for accurate fault detection.
It supports system-level functional safety up to SIL-2 (IEC 61508) via FMEDA analysis and includes OTP memory storing application-specific configurations - each orderable part number (e.g., LP87702KRHBR) has unique factory-programmed settings for startup sequence, voltage thresholds, and protection limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 3.5 A per channel - enables single-chip power delivery for dual-core processors or sensor+controller subsystems. |
| Buck Switching Frequency | 2 MHz / 3 MHz / 4 MHz (OTP-selectable) - allows optimization of size vs. efficiency; 4-MHz operation supports compact 0.47-µH inductors. |
| Boost Output | 5 V at 600 mA - powers USB peripherals, level translators, or isolated interface ICs without external boost circuitry. |
| Voltage Monitoring Inputs | Two independent analog inputs (VMON1, VMON2) with ±1% to ±7% window accuracy - supports real-time supervision of auxiliary rails or sensor supplies. |
| Functional Safety Support | FMEDA and Functional Safety Manual available for SIL-2 compliance - enables integration into IEC 61508-certified industrial control systems. |
| I²C Interface | Standard/Fast/Fast+/High-Speed modes (up to 3.4 MHz) - permits fast configuration and telemetry readback in time-critical diagnostics loops. |
| Thermal Protection | Overtemperature warning (115–150 °C) and shutdown (140–160 °C) with 20 °C hysteresis - prevents thermal runaway during sustained overload or poor PCB heatsinking. |
Pinout & Package
The LP87702KRHBR is housed in a 32-pin VQFN package (5.00 mm × 5.00 mm) with exposed thermal pad for enhanced thermal dissipation in high-power-density industrial layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| nINT | Open-drain interrupt output | Signals fault events (OVP, UVLO, thermal, watchdog timeout) to host MCU without requiring external pull-up on controller side. |
| PG0 / PG1 | Programmable power-good outputs | Configurable as active-high or open-drain signals to sequence downstream logic or enable FPGA banks after stable rail establishment. |
| VMON1 / VMON2 | Analog voltage monitoring inputs | Monitor external supply rails (0–5.5 V range); internally compared against OTP-programmed thresholds and windows for fault detection. |
| WDI / WD_RESET | Window watchdog input and reset output | WDI accepts periodic strobes; missing or out-of-window pulses trigger WD_RESET assertion to hard-reset connected microcontrollers. |
| SCL / SDA | I²C serial interface pins | Support standard (100 kHz) to high-speed (3.4 MHz) modes; SDA is bidirectional with internal pull-down; both require external pull-ups to VIO. |
| EN1 | Primary enable input | Asynchronous active-high signal that initiates full device startup sequence including soft-start, rail ramp-up, and diagnostic initialization. |
| NRST | Global reset input | Active-low asynchronous reset that forces all regulators into shutdown state and clears internal fault latches. |
| SW_B0 / SW_B1 | Buck switch nodes | High-frequency switching points (2–4 MHz); require low-ESR ceramic input/output capacitors and proper layout to minimize EMI and voltage spikes. |
| VOUT_BST | Boost output | Delivers regulated 4.9–5.2 V (OTP-selectable) with ±0.6% to ±9.4% monitoring window - suitable for powering 5-V USB PHYs or optocoupler drivers. |
Key Features
| Feature | Design Value |
|---|---|
| Auto PWM/PFM mode switching | Enables >90% efficiency at light loads (e.g., 10 mA) and maintains tight regulation at full 3.5-A output without manual mode control. |
| Programmable startup/shutdown sequencing | Allows precise timing control (delays configurable in µs) between buck0, buck1, and boost rails - critical for FPGAs and multi-rail SoCs. |
| Dedicated diagnostic reference voltage | Stable internal reference ensures consistent threshold comparisons across temperature and process variation for VMON and BUCKx monitoring functions. |
| Spread-spectrum modulation | Reduces peak EMI by dithering switching frequency - simplifies EMC compliance testing in dense industrial PCBs. |
| One-time-programmable (OTP) memory | Stores application-specific settings (voltage targets, timing, fault responses); eliminates need for external configuration EEPROM or boot-time I²C writes. |
Applications
| Automated Doors and Gates | Motion Detector (PIR/Motion Sensor) |
|---|---|
Use Scenario: Powering motor drivers, position encoders, and safety interlock controllers in commercial building access systems. IC Role / Device Role / Timing Role: Dual-buck supplies 3.3-V MCU core and 1.2-V FPGA I/O banks; boost provides 5-V gate driver bias; watchdog enforces safe shutdown on communication loss. Use Value: Integrated sequencing and diagnostics eliminate discrete supervisors and reduce BOM count by ≥4 components while meeting SIL-2 requirements. | Use Scenario: Enabling ultra-low-power occupancy sensing in battery- or energy-harvesting–powered smart lighting nodes. IC Role / Device Role / Timing Role: Buck converters operate in PFM mode during standby (<10 µA quiescent), wake on interrupt, then switch to PWM for sensor ADC and RF transmission bursts. Use Value: 9 µA standby current and programmable soft-start prevent inrush-induced brownout during wake cycles - extends battery life by >30% vs. discrete solutions. |
| Industrial Robot – Safety Area Scanner | Traffic Enforcement Camera System |
Use Scenario: Supplying laser diode drivers, ToF sensor arrays, and real-time safety PLCs in collaborative robot perimeter monitoring. IC Role / Device Role / Timing Role: Dual bucks power 1.8-V image sensor and 3.3-V safety microcontroller; VMON1 monitors 24-V field bus; window watchdog validates firmware execution integrity. Use Value: FMEDA-certified diagnostics and OTP-configured fault response enable direct integration into ISO 13849 PL e / SIL 2 safety architectures without additional safety hardware. | Use Scenario: Powering high-resolution CMOS image sensors, ISP processors, and LTE modems in roadside red-light violation detection units. IC Role / Device Role / Timing Role: Buck0 powers 1.1-V ISP core; buck1 supplies 1.8-V sensor interface; boost delivers 5-V USB 2.0 host for cellular modem tethering. Use Value: 4-MHz switching enables <3-mm² total passive area per buck stage; spread-spectrum reduces conducted emissions below CISPR-22 Class B limits without ferrite beads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-buck+boost power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | Single 3-A buck + 3-A buck + 5-V boost; no integrated window watchdog or FMEDA documentation; lower diagnostic coverage. | Targeted at non-safety-critical AM335x/AM437x-based industrial HMIs; lacks SIL-2 support and OTP configurability. | Select when functional safety certification is not required and higher total current (6 A combined) is needed over dual 3.5-A channels. |
| MAX20404ATPA/VY+ | 3.5-A buck + 3.5-A buck + 5-V boost; includes window watchdog and ASIL-B ready documentation; no OTP memory - configuration via I²C only. | Designed for automotive ADAS camera modules; AEC-Q100 qualified; operates up to 125°C ambient but lacks industrial-grade voltage monitoring flexibility. | Select for automotive environments requiring AEC-Q100 Grade 1 and ASIL-B compliance; avoid if industrial VMON threshold programmability or OTP lock-down is mandatory. |
Compared with TPS65218D0RSLR and MAX20404ATPA/VY+, the LP87702KRHBR uniquely combines SIL-2 FMEDA support, OTP-based safety configuration immutability, and dual independent voltage monitoring inputs - making it the only option qualified for IEC 61508-compliant industrial safety controllers where configuration tampering must be prevented post-deployment.
Availability
LP87702KRHBR is available at Aetrix Electronics and suitable for industrial automation, building security, and intelligent transportation systems requiring stable component supply, long-term lifecycle assurance, and functional safety documentation traceability.
Supply support for LP87702KRHBR 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 over 90 years of innovation in industrial and automotive electronics.
The LP87702KRHBR belongs to TI's functional safety power management portfolio, designed specifically for SIL-2–compliant industrial control, robotics, and infrastructure monitoring systems where deterministic fault response and configuration integrity are mandatory.
FAQ
What safety certifications does the LP87702KRHBR support?
The LP87702KRHBR supports system-level functional safety up to SIL-2 per IEC 61508, backed by TI's FMEDA report and Functional Safety Manual. It is not ASIL-B certified, nor is it rated for ISO 26262. The LP87702KRHBR's OTP memory stores safety-critical parameters (e.g., watchdog timeouts, voltage thresholds) to prevent runtime corruption - a key requirement for SIL-2 architectures.
How does the LP87702KRHBR handle power sequencing between its three regulators?
The LP87702KRHBR supports fully programmable startup and shutdown sequencing via I²C registers or OTP configuration. Delays between EN1 assertion and buck0/buck1/boost enablement are adjustable in 12.5-µs steps up to 100 ms. The LP87702KRHBR also provides dedicated PG0 and PG1 outputs that can be assigned to monitor any regulator and drive downstream enables - enabling complex multi-rail power trees without external sequencers.
Can the LP87702KRHBR operate without an external clock source?
Yes, the LP87702KRHBR includes an internal RC oscillator and operates fully autonomously without CLKIN. External clock input (1–24 MHz) is optional and used only to synchronize switching frequency across multiple LP87702KRHBR devices or align with system clocks to reduce beat frequencies. When CLKIN is absent or invalid, the LP87702KRHBR automatically reverts to internal clock operation with ±10% accuracy.
What is the purpose of the dedicated reference voltage pin on the LP87702KRHBR?
The LP87702KRHBR includes a dedicated internal reference voltage generator (VREF) routed to on-die comparators for VMON1, VMON2, and BUCKx monitoring circuits. This reference is trimmed and temperature-compensated to ensure ±0.5% stability over –40°C to +125°C, eliminating dependence on external references and guaranteeing consistent fault detection thresholds across operating conditions - a critical requirement for SIL-2 diagnostic coverage.
Does the LP87702KRHBR support current measurement for its buck converters?
Yes, the LP87702KRHBR integrates current-sense amplifiers for both buck channels with 20-mA LSB resolution and <10% accuracy above 1 A. Measured values are accessible via I²C register reads (0x3E–0x3F). The LP87702KRHBR performs automatic current measurement during PWM mode in 25 µs or in auto mode in 50 µs - enabling real-time load monitoring for predictive maintenance or dynamic power capping in industrial edge nodes.
LP87702KRHBR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Industrial
- Current - Supply:
- 27mA
- Voltage - Supply:
- 2.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-VQFN (5x5)
LP87702KRHBR FAQ
1.How can I place an order for LP87702KRHBR through Aetrix?
Please submit a Request for Quotation (RFQ) for LP87702KRHBR 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 LP87702KRHBR reliable?
The price and inventory of LP87702KRHBR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP87702KRHBR is usually 5 days.
3.What payment methods are accepted for LP87702KRHBR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP87702KRHBR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP87702KRHBR?
LP87702KRHBR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP87702KRHBR 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 LP87702KRHBR?
For technical support, including LP87702KRHBR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP87702KRHBR requirements.
6.How does Aetrix verify that LP87702KRHBR is sourced from the original manufacturer or authorized distributors?
All LP87702KRHBR 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 LP87702KRHBR meets industry standards.
7.What is the process for return or replacement of LP87702KRHBR?
All LP87702KRHBR units undergo pre-shipment inspection (PSI). If there is an issue with LP87702KRHBR, 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 LP87702KRHBR part is unused and in its original packaging.
Return procedure for LP87702KRHBR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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