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Texas Instruments LP87702KRHBT
- Part No.:
- LP87702KRHBT
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
LP87702KRHBT.pdf
- Description:
- DUAL BUCK CONVERTER AND 5-V BOOS
- Quantity:
- Payment:
- Shipping:
Inventory:495
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Product details
Overview
LP87702KRHBT from Texas Instruments is a dual-buck + 5-V boost power management IC with integrated diagnostics for functional safety–critical systems. It delivers up to 3.5 A per buck channel (0.7–3.36 V output), supports 2/3/4 MHz switching, includes a 600 mA boost converter, two voltage monitoring inputs, window watchdog, and I²C interface - deployed in industrial robot safety scanners and traffic enforcement sensors.
For engineers reviewing the LP87702KRHBT datasheet, LP87702KRHBT pinout, LP87702KRHBT application, or LP87702KRHBT equivalent, key selection criteria include SIL-2 support via FMEDA, programmable sequencing with enable signals, spread-spectrum modulation for EMI reduction, and OTP-configured startup/shutdown timing for deterministic power-up behavior in safety-critical embedded control.
Technical Context
The LP87702KRHBT integrates two synchronous buck converters with auto PWM/PFM mode switching and a dedicated 5-V boost stage, all sharing a common analog supply (VANA) and thermal sensing. Its diagnostic architecture includes independent voltage monitors (VMON1/VMON2), programmable power-good outputs (PG0/PG1), and a window watchdog with WDI input and WD_RESET output - enabling system-level fault detection and recovery.
Operation is controlled via I²C with register-mapped configuration of switching frequency, output voltages, current limits (1.5–4.5 A forward, 1.6–3 A negative), thermal warning (115–150 °C), and protection thresholds. The device uses one-time-programmable (OTP) memory to fix application-specific settings per orderable part number, eliminating runtime configuration overhead in certified systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Buck Output Current | 3.5 A max per channel - supports high-current rails for FPGA I/O banks or motor driver logic supplies. |
| Buck Output Voltage Range | 0.7 V to 3.36 V in programmable steps - covers core voltages for ARM Cortex-M7, DSPs, and image sensors. |
| Boost Output | 5 V @ 600 mA - powers USB peripherals, optical encoders, or isolated gate drivers without external LDO. |
| Switching Frequency | 2 / 3 / 4 MHz (OTP-set) - enables compact 0.47 µH inductors and reduces output capacitance requirements. |
| Diagnostic Coverage | FMEDA & Functional Safety Manual for SIL-2 (IEC 61508) - supports ASIL-B automotive and Category 3 PLd industrial safety certification. |
| Thermal Protection | Overtemperature warning at 115–150 °C (configurable), shutdown at 140–160 °C - prevents thermal runaway in sealed enclosures. |
| I²C Interface | Supports Standard (100 kHz), Fast (400 kHz), Fast+ (1 MHz), and High-Speed (3.4 MHz) modes - enables rapid register access during dynamic reconfiguration. |
Pinout & Package
The LP87702KRHBT is housed in a 32-pin VQFN package (5.00 mm × 5.00 mm) with exposed thermal pad for enhanced heat dissipation in industrial ambient conditions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| nINT | Open-drain interrupt output | Signals fault events (OVP, UVLO, thermal, watchdog timeout) to host MCU without pull-up dependency on system rail. |
| PG0 / PG1 | Programmable power-good outputs | Configurable as active-high push-pull or open-drain signals - used for sequenced enable of downstream rails or FPGA configuration lock. |
| VMON1 / VMON2 | Analog voltage monitoring inputs | Monitor external supplies (0–5.5 V range) with ±1% to ±7% window accuracy - validates auxiliary 3.3 V or 24 V sensor rails. |
| WDI / WD_RESET | Window watchdog digital interface | WDI accepts periodic strobes; WD_RESET asserts reset if strobe interval exceeds window - critical for fail-safe motion control loops. |
| CLKIN | External clock input / GPO2 | Synchronizes buck switching to system master clock (1–24 MHz) - eliminates beat frequencies in multi-rail systems. |
| EN1 / SCL / SDA | Enable / I²C clock / I²C data | EN1 initiates full power-up sequence; SCL/SDA support hot-plug register read/write with 3.4 MHz high-speed mode. |
Key Features
| Feature | Design Value |
|---|---|
| Auto PWM/PFM mode switching | Enables >90% efficiency at light loads (e.g., 10 mA) and maintains regulation stability across 0–3.5 A without manual mode control. |
| Programmable start-up/shutdown sequencing | Delays and ordering between buck0, buck1, and boost outputs prevent inrush current conflicts in multi-rail FPGAs or SoCs. |
| Dedicated reference voltage for diagnostics | Stable internal reference ensures ±0.5% accuracy for VMON1/VMON2 measurements - eliminates need for external precision references. |
| Spread-spectrum modulation | Reduces peak EMI by ±1% frequency dithering - meets CISPR-32 Class B limits in compact industrial enclosures without added shielding. |
| Output short-circuit and overload protection | Fast current limiting (1.5–4.5 A forward, 1.6–3 A reverse) prevents damage during cable shorts or sensor faults in field-deployed equipment. |
Applications
| Industrial Robot – Safety Area Scanner | Automated Doors and Gates |
|---|---|
Use Scenario: Powering time-of-flight (ToF) sensor arrays and real-time motion analysis ASICs in collaborative robot zones. IC Role / Device Role / Timing Role: LP87702KRHBT provides tightly regulated 1.2 V (buck0) and 3.3 V (buck1) for sensor processing, plus 5 V (boost) for laser diode drivers - all with synchronized switching to avoid interference. Use Value: Integrated window watchdog and voltage monitors enable automatic safe shutdown upon sensor rail deviation - meeting ISO/TS 15066 safety requirements. | Use Scenario: Controlling motor drive logic, position feedback circuitry, and wireless connectivity modules in access control systems. IC Role / Device Role / Timing Role: LP87702KRHBT delivers 2.5 V (buck0) for microcontroller cores, 3.3 V (buck1) for Hall-effect sensors, and 5 V (boost) for Bluetooth LE radios - with programmable sequencing to prevent brown-out during motor startup. Use Value: SIL-2 FMEDA documentation accelerates CE marking for EN 13241-1 compliance in automated barrier systems. |
| Traffic Enforcement Camera System | Occupancy Detection (People Counting) |
Use Scenario: Supplying image signal processor (ISP), CMOS image sensor, and IR illuminator in roadside radar-camera units. IC Role / Device Role / Timing Role: LP87702KRHBT generates 1.1 V (buck0) for ISP cores, 1.8 V (buck1) for DDR memory interfaces, and 5 V (boost) for IR LEDs - with spread-spectrum modulation suppressing EMI in RF-sensitive environments. Use Value: Dual voltage monitors validate 12 V vehicle battery and 5 V PoE-derived rails - ensuring reliable operation during engine cranking or network power fluctuations. | Use Scenario: Powering thermal imaging sensors, edge AI accelerators, and LoRaWAN transceivers in smart building occupancy nodes. IC Role / Device Role / Timing Role: LP87702KRHBT supplies 0.9 V (buck0) for ultra-low-power vision processors, 3.3 V (buck1) for PIR signal conditioning, and 5 V (boost) for antenna biasing - with thermal warning at 125 °C preventing false triggers in attic-mounted units. Use Value: OTP-configured soft-start delays ensure deterministic boot timing across thousands of distributed nodes - simplifying firmware synchronization in mesh networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar power management applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS65218D0RSLR | Single-buck + single-boost + LDOs; no window watchdog or FMEDA; lower current (2 A buck). | Targeted at non-safety-critical AM335x-based industrial HMIs; lacks diagnostic coverage for SIL-2. | Select when cost sensitivity outweighs functional safety requirements and 3.5 A buck current is unnecessary. |
| MAX20404ATPA/VY+ | Dual-buck + boost with integrated FETs; includes PMBus interface; no OTP configuration or dedicated watchdog reset pin. | Designed for automotive ADAS camera modules; higher operating temperature (125 °C ambient) but no SIL-2 documentation. | Choose for PMBus-based telemetry and automotive qualification where I²C configurability is secondary to bus protocol compatibility. |
Compared with TPS65218D0RSLR and MAX20404ATPA/VY+, the LP87702KRHBT uniquely combines SIL-2 FMEDA support, OTP-fixed sequencing, and a hardware window watchdog with dedicated WD_RESET output - making it the only option for certified industrial safety subsystems requiring deterministic fault response without software intervention.
Availability
LP87702KRHBT is available at Aetrix Electronics and suitable for building automation, factory robotics, and intelligent transportation systems requiring stable component supply, long-term lifecycle assurance, and functional safety documentation.
Supply support for LP87702KRHBT 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 50 years of industrial-grade product development.
The LP87702KRHBT belongs to TI's functional safety–certified power management portfolio, engineered specifically for industrial automation, robotics, and transportation infrastructure where deterministic power sequencing and hardware-level fault detection are mandatory.
FAQ
What safety certifications does the LP87702KRHBT support?
The LP87702KRHBT includes FMEDA analysis and a Functional Safety Manual supporting system-level compliance up to SIL-2 per IEC 61508. It is not ASIL-certified, but its diagnostic features - including window watchdog, voltage monitors, and thermal warning - are architected to meet requirements for Category 3 PLd machinery safety standards. TI provides documentation to assist integrators in achieving end-equipment certification.
How does the LP87702KRHBT handle power sequencing for multiple rails?
The LP87702KRHBT implements programmable start-up and shutdown delays and sequencing via OTP configuration and I²C registers. Engineers define relative timing between buck0, buck1, and boost outputs using dedicated enable signals (EN1) and configurable GPOs. This eliminates external timing components and ensures repeatable, deterministic power-up behavior required in FPGA- or SoC-based industrial controllers.
Can the LP87702KRHBT operate without an external clock source?
Yes, the LP87702KRHBT operates using its internal RC oscillator when CLKIN is left unconnected or disabled. The internal oscillator supports all switching frequencies (2/3/4 MHz) and enables full functionality including diagnostics and I²C communication. External clock synchronization via CLKIN is optional and used only to reduce EMI through switching frequency alignment in multi-rail systems.
What is the role of the VANA pin on the LP87702KRHBT?
The VANA pin supplies power to the LP87702KRHBT's analog and digital blocks and must be connected to the same node as VIN_B0 and VIN_B1. It sets the reference for internal comparators used in voltage monitoring (VMON1/VMON2), power-good generation, and thermal sensing. Its recommended operating range is 2.8 V to 5.5 V, and it supports overvoltage (5.6–6.1 V) and undervoltage (2.51–2.75 V) protection thresholds.
Does the LP87702KRHBT support spread-spectrum modulation, and how is it configured?
Yes, the LP87702KRHBT supports spread-spectrum modulation to reduce electromagnetic interference. It is enabled via I²C register configuration and applies ±1% frequency dithering around the selected switching frequency (2/3/4 MHz). This feature requires no external components and remains active during both PWM and PFM modes - helping designs meet CISPR-32 radiated emissions limits without additional filtering.
LP87702KRHBT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- -
- Current - Supply:
- 27mA
- Voltage - Supply:
- 2.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount, Wettable Flank
- Supplier Device Package:
- 32-VQFN (5x5)
LP87702KRHBT FAQ
1.How can I place an order for LP87702KRHBT through Aetrix?
Please submit a Request for Quotation (RFQ) for LP87702KRHBT 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 LP87702KRHBT reliable?
The price and inventory of LP87702KRHBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP87702KRHBT is usually 5 days.
3.What payment methods are accepted for LP87702KRHBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP87702KRHBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP87702KRHBT?
LP87702KRHBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP87702KRHBT 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 LP87702KRHBT?
For technical support, including LP87702KRHBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP87702KRHBT requirements.
6.How does Aetrix verify that LP87702KRHBT is sourced from the original manufacturer or authorized distributors?
All LP87702KRHBT 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 LP87702KRHBT meets industry standards.
7.What is the process for return or replacement of LP87702KRHBT?
All LP87702KRHBT units undergo pre-shipment inspection (PSI). If there is an issue with LP87702KRHBT, 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 LP87702KRHBT part is unused and in its original packaging.
Return procedure for LP87702KRHBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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