LP87702 - Dual Buck + 5V Boost PMIC | Texas Instruments
MPN: LP87702 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.2 | $7.20 |
| 10 | $6.48 | $64.80 |
| 100 | $5.62 | $562.00 |
| 500 | $4.9 | $2,450.00 |
| 1,000 | $4.35 | $4,350.00 |
LP87702 Overview
A PMIC (Power Management Integrated Circuit) consolidates multiple power conversion and management functions into a single package. In the power-management hierarchy, the LP87702 is a multi-rail switching regulator (buck/boost DC-DC converter) within the broader category of power management ICs, reducing board space and simplifying power sequencing versus discrete solutions.
Key features include two synchronous buck converters delivering up to 3A each, a 5V boost converter with up to 600mA output, and programmable start-up and shutdown sequences synchronized to the enable signal. Diagnostic functions - two voltage monitoring inputs for external rails, a window watchdog, current limiting, and thermal shutdown - are critical for functional-safety designs. Automatic PWM/PFM (AUTO mode) operation maintains high efficiency over a wide load range.
The LP87702 uses fixed-frequency PWM control with internal compensation. The buck converters switch at 2.2MHz, enabling small external inductors and capacitors. Remote voltage sensing improves output accuracy by compensating PCB trace resistance, which matters for high-current radar loads. An I2C interface supports dynamic voltage scaling and status monitoring.
Typical applications include industrial radar sensors, ADAS radar front ends, safety-critical embedded systems, and camera modules requiring 5V rails for analog front ends. Integrated diagnostics and the watchdog suit ASIL-oriented designs, while compact footprint suits space-constrained industrial sensors.
When designing with the LP87702, connect remote-sense pins at the point of load and follow TI datasheet layout guidance: solid ground plane, input decoupling close to VIN, and careful switch-node routing to limit EMI.
Drop-in alternatives for LP87702 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LP87702 (same form factor and footprint) — differing in Package, Topology.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LP87702-Q1
✅ Drop-In📋 Reference alternative (not in catalog)
LP87702DRHBRQ1
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →LP87702KRHBT
✅ Drop-In📋 Reference alternative (not in catalog)
LP87725-Q1
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
Contact for price
View Datasheet →LP87721-Q1
⚡ Same Package ⚠️ Specs Unverified✓ In Stock
Contact for price
View Datasheet →LP87702 Maximum Ratings & Electrical Characteristics
| Topology | Dual buck + 5V boost converter |
| Input Voltage Range | 2.8 V to 5.5 V |
| Buck Output Current | 3 A per buck (Buck0, Buck1) |
| Boost Output | 5 V, up to 600 mA |
| Switching Frequency | 2.2 MHz |
| Control Mode | Fixed-frequency PWM with AUTO (PWM/PFM) mode |
| Remote Voltage Sensing | Yes - compensates IR drop to point of load |
| Diagnostics | 2 voltage monitoring inputs, window watchdog, current limit, thermal shutdown |
| Interface | I2C (dynamic voltage scaling and status monitoring) |
| Power Sequencing | Programmable start-up/shutdown synchronized to enable, with GPIO |
| Package | 32-VQFN (RHB), 5x5 mm |
| Mounting Type | Surface Mount |
| Application Target | Industrial radar, ADAS, safety-critical systems |
| RoHS Status | Compliant |
| Lifecycle Status | Active |
LP87702 Pin Configuration
| Pin 1 | Buck0_SW — Buck0 switch node - connect to power inductor |
| Pin 2 | Buck1_SW — Buck1 switch node - connect to power inductor |
| Pin 3 | Boost_SW — Boost converter switch node |
| Pin 4 | VIN — Input supply, 2.8V to 5.5V |
| Pin 5 | GND — Ground / power ground |
| Pin 6 | EN — Enable input, synchronizes programmable power sequencing |
| Pin 7 | SDA — I2C data for control and status |
| Pin 8 | SCL — I2C clock |
| Pin 9 | nINT — Interrupt output for fault/status reporting |
| Pin 10 | VSNS — Remote voltage sense input - connect at point of load |
| Pin 11 | VMON1 — External voltage monitoring input 1 |
| Pin 12 | VMON2 — External voltage monitoring input 2 |
| Pin 13 | WDI — Window watchdog input from MCU |
| Pin 14 | GPIO — General-purpose digital output for sequencing |
Typical Applications
LP87702 is suitable for 6 applications: Industrial Radar Sensor Power Supply, ADAS Radar Front End, Safety-Critical Embedded Systems, Automotive Camera Modules, Compact Industrial Sensor Nodes, Test and Measurement Instrumentation.
Industrial Radar Sensor Power Supply
The LP87702 fits industrial radar (e.g., 60/77 GHz mmWave sensor front ends) because its two 3A synchronous bucks at 2.2MHz can supply the RF transceiver core and digital rails from a 5V rail with small external magnetics, while the integrated 5V boost (600mA) powers analog front-end stages requiring a clean 5V. Remote voltage sensing compensates PCB IR drop at high radar load currents, and the window watchdog plus two external voltage monitors support safety diagnostics required in industrial safety sensors. Place sense lines at the point of load and follow TI layout guidance for EMI control.
Recommended
ADAS Radar Front End
ADAS corner-radar and front-radar modules benefit from the LP87702 architecture: programmable start-up/shutdown sequencing synchronized to the enable signal ensures the radar MCU, transceiver, and analog rails power up in the required order. The two voltage monitoring inputs supervise external rails such as CAN or camera supplies, and the I2C interface enables dynamic voltage scaling for adaptive range modes. The automotive-qualified LP87702-Q1 variant provides the same function with AEC-Q100 compliance for in-vehicle deployment.
Recommended
Safety-Critical Embedded Systems
For ASIL-oriented and functional-safety systems, the LP87702 integrates the supervision building blocks designers otherwise add discretely: a window watchdog detects CPU lockup, current limiting and thermal shutdown protect against faults, and voltage monitors flag out-of-range conditions. The 3A buck rails supply a safety MCU such as an AM263x-class device, while diagnostics report status through I2C and nINT. This integration reduces board area and single-point-of-failure analysis scope compared to discrete supervisor ICs.
Recommended
Automotive Camera Modules
Camera PMIC applications (per TI DigiKey categorization of the LP87702 family) use the dual bucks for the image-sensor core and SerDes digital rails and the 5V boost for analog front-end power. The 2.2MHz switching frequency keeps ripple components above the sensor signal band, and programmable GPIOs control power-up order of the image sensor and serializer to avoid latch-up. I2C status monitoring allows the host ECU to verify rail health each frame cycle, supporting functional-safety camera architectures.
Recommended
Compact Industrial Sensor Nodes
Space-constrained industrial IoT sensor nodes use the LP87702 to derive multiple rails from a single 5V or 3.3V backplane rail in a 5x5 mm footprint. AUTO PWM/PFM mode sustains high efficiency down to light standby loads, extending system-level energy budgets, while the boost converter supplies a 5V rail for sensors or indicators that need it. Integrated sequencing removes external supervisor circuitry, and thermal shutdown protects against enclosure overheating in sealed industrial housings.
Recommended
Test and Measurement Instrumentation
Instrument modules and radar evaluation hardware use the LP87702 as a compact multi-rail supply stage: the 3A bucks power FPGA or DSP core rails with I2C-controlled dynamic voltage scaling for performance profiling, and the 5V boost feeds interface circuitry. Diagnostics (voltage monitors, watchdog, nINT) allow the instrument controller to log power-integrity events. The 2.2MHz fixed-frequency PWM simplifies input filter design where upstream bench supplies introduce conducted noise.
Recommended
Recommended Products Summary
Engineering reference data for LP87702 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LP87702-Q1 | LP87702DRHBRQ1 | LP87725-Q1 | LP87721-Q1 |
|---|---|---|---|---|---|
| Package | 32-VQFN (RHB) 5x5 mm | 32-VQFN (RHB) 5x5 mm - same | 32-VQFN (RHB) 5x5 mm - same | 32-VQFN (RHB) 5x5 mm - same platform | 32-VQFN (RHB) 5x5 mm - same platform |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Qualification Grade | Industrial | AEC-Q100 (automotive) | AEC-Q100 (automotive) | AEC-Q100 | AEC-Q100 |
| Input Voltage Range | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V | 2.8 V to 5.5 V (platform) | 2.8 V to 5.5 V (platform) |
| 5V Boost Converter | Yes, up to 600 mA | Yes, up to 600 mA | Yes, up to 600 mA | Configuration differs - verify datasheet | Configuration differs - verify datasheet |
| Diagnostics (Watchdog, VMON) | Window watchdog + 2 voltage monitors | Window watchdog + 2 voltage monitors | Window watchdog + 2 voltage monitors | Similar platform diagnostics | Similar platform diagnostics |
| Drop-in Compatibility | Reference | Yes - pin-for-pin | Yes - pin-for-pin | No - same platform, different pin mapping | No - same platform, different pin mapping |
Key Differentiators
- Integrated 5V boost converter (vs LP87725-Q1)
- Remote voltage sensing for high-current radar loads (vs Discrete dual-buck solutions)
- Functional-safety diagnostics on-chip (vs TPS563207DRLR (discrete buck))
Design Notes
Connect remote voltage sense (VSNS) lines as a Kelvin pair directly at the point-of-load capacitor, away from the switch-node traces, to accurately compensate IR drop at 3A loads. Keep the 2.2MHz buck switch nodes short with a tight input capacitor loop; use a solid, unbroken ground plane under the VQFN thermal pad with an array of thermal vias to ground. Follow the LP87702 EVM layout in the TI user guide as the reference.
The 2.2MHz fixed-frequency PWM places switching harmonics well above AM band but within common radar IF ranges; add a small RC or ferrite bead filter on rails feeding RF transceiver supplies, and avoid routing switch nodes near radar antenna feedlines. Ensure the 5V boost output feeding analog stages has adequate bulk and high-frequency ceramic decoupling (10uF + 100nF).
Do not confuse LP87702 (industrial) with LP87702-Q1 (automotive AEC-Q100) when released drawings specify a qualification grade - the orderable suffix differs. Program start-up/shutdown sequences and watchdog timing via I2C before production; defaults may not match your power tree. Verify that external rails on VMON1/VMON2 stay within the monitor input range to avoid false fault assertions on nINT.
Compliance Information
Standard LP87702 is the industrial-grade version; the AEC-Q100 qualified variant is LP87702-Q1. RoHS compliance per TI product page.
