LP87702DRHBRQ1 - Dual Buck + 5V Boost PMIC for Radar | TI
MPN： LP87702DRHBRQ1 ✓ 啟用中LP87702DRHBRQ1 概覽
A PMIC (Power Management IC) is an integrated circuit that combines multiple voltage regulators and supervisory functions into a single package, simplifying board layout, reducing BOM count, and improving system-level reliability. Within the broader power-management hierarchy, a multi-rail PMIC sits above discrete LDOs and single-channel DC/DC converters, and the LP87702DRHBRQ1 specifically targets radar and camera SoC power trees where deterministic sequencing, fault monitoring, and a small PCB footprint are required. The integrated 5-V boost converter eliminates the need for an external pre-regulator when powering MMIC PA rails or image-sensor analog supplies.
Key features include two high-efficiency synchronous buck converters, one boost output, window watchdog with programmable timing, two voltage monitors, output over-current and over-temperature protection, and a serial control interface for output-voltage margining. The device supports OTP-programmed default voltages per part-number variant, allowing different rails to be configured without external resistor dividers. A thermal shutdown block and under-voltage lockout complete the protection set. The compact 5x5 mm VQFN-32 package offers an exposed thermal pad to dissipate power from the boost stage under heavy radar load conditions.
The LP87702's automotive-grade qualification (AEC-Q100 Grade 1, -40C to +125C) and integrated diagnostics make it suitable for safety-critical ADAS functions including front radar, surround-view cameras, and driver-monitoring systems. The window watchdog and voltage monitors support ISO 26262 functional-safety architectures by providing independent fault detection outside the host SoC.
Typical applications include automotive radar power supplies (77-GHz front radar), surround-view and front-camera PMICs, ADAS ECU rails, and any multi-rail SoC requiring sequenced startup with supervisory diagnostics. Designers should verify OTP defaults for their specific SKU and budget boost-converter thermal dissipation when designing continuous-wave radar loads.
When designing with this device, allocate sufficient copper area beneath the exposed pad to keep junction temperature within the AEC-Q100 envelope, and follow TI's recommended input/bulk capacitor network on the boost rail to suppress input ripple during radar chirp events.
This page synthesizes distributor pricing, automotive-grade alternatives, and application-specific design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 LP87702DRHBRQ1 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LP87702DRHBRQ1 （相同外形與佔位） — 差異在於 Package, Topology.
LP87702DRHBTQ1
✅ 直接替換📋 參考替代品（不在目錄中）
LP87702DRHBRQ1
✅ 直接替換聯絡詢價
查看資料表 →TPS65653-Q1
✅ 直接替換📋 參考替代品（不在目錄中）
LP87702DRHBRQ1 最大額定值與電氣特性
| 拓撲 | Dual Buck + 5-V Boost (Step-Down DC/DC and Step-Up DC/DC) |
| 輸出數量 | 3 (2 Buck + 1 Boost) |
| Output Voltage (Buck 1) | OTP-programmed per SKU |
| Output Voltage (Buck 2) | OTP-programmed per SKU |
| Boost Output Voltage | 5 V |
| 工作溫度範圍 | -40C to +125C (AEC-Q100 Grade 1) |
| 封裝 | VQFN-32 (RHB) 5x5 mm with exposed thermal pad |
| 安裝類型 | Surface Mount |
| AEC-Q100 Qualification | Qualified (automotive grade) |
| Watchdog | Window watchdog, programmable timing |
| Voltage Monitors | 2 external supply monitor inputs |
| Control Interface | Serial I2C-compatible interface |
| Protection Features | OCP, OTP, UVLO, output discharge |
| RoHS 狀態 | Compliant |
| Lead-Free | Yes |
LP87702DRHBRQ1 腳位配置
| 腳位 1 | VIN1 — Input supply for buck converter 1 |
| 腳位 2 | VIN2 — Input supply for buck converter 2 |
| 腳位 3 | VIN_BOOST — Input supply for boost converter |
| 腳位 4 | EN — Enable input |
| 腳位 5 | PGOOD — Power good output |
| 腳位 6 | RESET — Reset output |
| 腳位 7 | SCL — Serial clock (I2C-compatible) |
| 腳位 8 | SDA — Serial data (I2C-compatible) |
| 腳位 9 | MON1 — External voltage monitor input 1 |
| 腳位 10 | MON2 — External voltage monitor input 2 |
| 腳位 11 | WDI — Watchdog input |
| 腳位 12 | AGND — Analog ground |
| 腳位 13 | BST_SNS — Boost sense input |
| 腳位 14 | BST_SW — Boost switch node |
| 腳位 15 | BST_OUT — Boost output (5 V) |
| 腳位 16 | BST_FB — Boost feedback |
| 腳位 17 | SW1 — Buck 1 switch node |
| 腳位 18 | FB1 — Buck 1 feedback |
| 腳位 19 | VOUT1 — Buck 1 output voltage |
| 腳位 20 | PGND1 — Buck 1 power ground |
| 腳位 21 | SW2 — Buck 2 switch node |
| 腳位 22 | FB2 — Buck 2 feedback |
| 腳位 23 | VOUT2 — Buck 2 output voltage |
| 腳位 24 | PGND2 — Buck 2 power ground |
| 腳位 25 | NC — Not connected (per datasheet) |
| 腳位 26 | NC — Not connected (per datasheet) |
| 腳位 27 | NC — Not connected (per datasheet) |
| 腳位 28 | NC — Not connected (per datasheet) |
| 腳位 29 | NC — Not connected (per datasheet) |
| 腳位 30 | NC — Not connected (per datasheet) |
| 腳位 31 | NC — Not connected (per datasheet) |
| 腳位 32 | NC — Not connected (per datasheet) |
| 腳位 33 | EP — Exposed thermal pad - connect to GND |
典型應用
LP87702DRHBRQ1 適用於 6 應用s: Automotive 77-GHz Front Radar Power Supply, Surround-View and Front-Camera ECU Power, ADAS ECU Multi-Rail Sequencing with Watchdog Supervision, Driver Monitoring System (DMS) Camera Power, Automotive Industrial Sensor Hub Power, Backup Camera and Rear-View Assist Power.
Automotive 77-GHz Front Radar Power Supply
The LP87702DRHBRQ1 is purpose-built for 77-GHz front radar MMIC power trees. Its two synchronous buck rails power the radar transceiver and baseband FPGA/SoC, while the integrated 5-V boost converter directly drives the MMIC PA stage without an external pre-regulator. The AEC-Q100 Grade 1 qualification (-40C to +125C) and integrated window watchdog support ISO 26262 functional-safety architectures required for ASIL-rated front radar ECUs. Compared with discrete buck + boost designs, the LP87702DRHBRQ1 reduces BOM count by 4-6 components and saves approximately 25-40% PCB area, critical for compact bumper-mounted radar modules where thermal dissipation must be managed in an enclosed IP67 housing.
推薦
Surround-View and Front-Camera ECU Power
Surround-view and front-camera ECUs use the LP87702DRHBRQ1 to generate the 1.8-V serializer, 1.0-V SoC core, and 3.3-V I/O rails from the automotive 12-V battery. The integrated 5-V boost powers the image sensor's analog supply or LED illuminator driver, while the window watchdog supervises the camera SoC for proper firmware execution. The compact 5x5 mm VQFN-32 package enables placement near the image sensor with minimal trace length, reducing EMI on sensitive analog video signals. AEC-Q100 Grade 1 qualification ensures compliance with automotive camera OEM reliability standards, and the OTP-programmed output voltages eliminate the need for external feedback resistor networks.
推薦
ADAS ECU Multi-Rail Sequencing with Watchdog Supervision
ADAS ECUs (electronic control units) require deterministic power-up sequencing across multiple voltage domains, and the LP87702DRHBRQ1 delivers this through OTP-programmed soft-start timing and a window watchdog. The two voltage monitor inputs allow the host SoC to supervise external 5-V and 3.3-V rails, while the integrated watchdog catches firmware lock-ups that would otherwise leave the vehicle in an unsafe state. Compared with discrete supervisory ICs plus buck regulators, the LP87702DRHBRQ1 consolidates supervision and conversion into one device, reducing the ASIL decomposition complexity and saving roughly 100 mm² of PCB area in space-constrained ECU housings.
推薦
Driver Monitoring System (DMS) Camera Power
Driver monitoring systems (DMS) inside the cabin require small, thermally efficient PMICs that can operate continuously without overheating. The LP87702DRHBRQ1's two buck rails power the DMS camera SoC and IR illuminator, while the 5-V boost supplies the IR LED driver for night-time eye-tracking. The AEC-Q100 Grade 1 qualification, plus integrated thermal shutdown and over-current protection, ensures reliability in the high-temperature cabin environment (up to +85C ambient). The exposed thermal pad of the VQFN-32 package provides low thermal resistance to the PCB, allowing continuous DMS operation at full load without external heatsinking.
推薦
Automotive Industrial Sensor Hub Power
Beyond ADAS, the LP87702DRHBRQ1 powers industrial-grade sensor hubs that share the same multi-rail + diagnostic requirements. Its integrated diagnostics (window watchdog, voltage monitors, OTP, OCP) simplify functional-safety certification for machinery and robotics systems operating in harsh environments. The wide input voltage range supports 12-V and 24-V industrial battery rails, while the 5x5 mm VQFN package fits densely populated sensor boards. Compared with industrial-only PMICs, the AEC-Q100 qualification provides additional margin for vibration, temperature cycling, and humidity stress that industrial sensors frequently encounter.
推薦
Backup Camera and Rear-View Assist Power
Backup camera and rear-view assist modules use the LP87702DRHBRQ1 to generate the serializer, SoC, and image-sensor analog rails from the rear-lamp power feed. The window watchdog catches firmware lock-ups that could leave the camera image frozen, a critical safety feature for reversing maneuvers. The integrated 5-V boost eliminates a discrete boost converter, reducing BOM cost and PCB area in the space-constrained rear-camera housing. AEC-Q100 Grade 1 qualification and -40C to +125C operation cover the underbody mounting environment where temperature extremes are common during cold starts and summer sun exposure.
推薦
推薦產品摘要
工程參考資料，適用於 LP87702DRHBRQ1 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LP87702DRHBTQ1 | LP87702DRHBRQ1 | TPS65653-Q1 |
|---|---|---|---|---|
| Package | VQFN-32 (RHB) 5x5 mm | VQFN-32 (RHB) 5x5 mm - same | VQFN-32 (RHB) 5x5 mm - same | VQFN-32 (RHB) 5x5 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Topology | 2 Buck + 5-V Boost | 2 Buck + 5-V Boost - identical | 2 Buck + 5-V Boost - identical | 3 Buck only (no boost) |
| Number of Outputs | 3 (2 Buck + 1 Boost) | 3 (2 Buck + 1 Boost) | 3 (2 Buck + 1 Boost) | 3 Buck only |
| AEC-Q100 Grade | Grade 1 (-40C to +125C) | Grade 1 | Grade 1 | Grade 1 |
| Window Watchdog | Yes, programmable | Yes | Yes | Yes |
| Reel Quantity | 3000 pcs | 250 pcs | 3000 pcs | 3000 pcs |
| Approx. Unit Price (1k qty) | $3.10 | $3.10 (same) | $3.10 (identical) | $2.80 (approx.) |
主要差異化特點
- Integrated 5-V boost converter eliminates external pre-regulator (對比TPS65653-Q1)
- Higher quantity reel reduces per-unit cost in volume production (對比LP87702DRHBTQ1)
- Two external voltage monitor inputs enable ISO 26262 supervision (對比Discreet buck + boost solution)
設計說明
Estimated: With VIN=12 V, VOUT_BST=5 V at 0.4 A, the boost converter dissipates approximately (12-5)*0.4 = 2.8 W. The VQFN-32 (RHB) 5x5 mm package with the exposed thermal pad soldered to a 1 square inch copper pour achieves approximately theta_JA of 30 C/W, yielding a junction temperature rise of about 84 C above ambient. For continuous radar operation at 85 C ambient, ensure copper pour is at least 1 square inch and consider thermal vias to inner ground planes to keep Tj below 125 C. At higher boost loads or higher VIN, supplementary copper or forced airflow may be required.
Place the input bulk capacitors (typically 10 uF X7R ceramic + 100 uF aluminum polymer) within 5 mm of the VIN pins to minimize input ripple during radar chirp events. Keep the boost switch node (BST_SW) traces short and isolated from analog signal traces to prevent EMI coupling into the radar receive path. The exposed thermal pad must be soldered to a continuous ground copper pour with at least 9 thermal vias (0.3 mm drill, 1 mm pitch) for low thermal resistance. Avoid routing digital signals (SCL, SDA, WDI) near the boost switch node to prevent noise injection.
Do not skip the OTP-programmed output voltage configuration step in your firmware - the LP87702DRHBRQ1 defaults to factory-programmed voltages per SKU, and incorrect assumptions about default rails will prevent your SoC from booting. The window watchdog requires periodic WDI toggling from the host SoC; failure to service the watchdog within the programmed window will trigger RESET. Two voltage monitor inputs (MON1, MON2) must be connected to the rails being supervised, or left grounded if unused - do not leave them floating.
Place the boost output capacitor directly at the BST_OUT pin with the return trace to PGND, not AGND, to prevent ground bounce during boost switching transitions. Use star-ground topology with the LP87702DRHBRQ1 exposed pad as the central ground reference, and route noisy return currents (BST_SW, buck switch nodes) directly to PGND without sharing traces with analog MON1/MON2 return paths. For radar applications, shield the boost converter area with a grounded copper pour to minimize radiated EMI that could couple into the radar MMIC.
合規資訊
AEC-Q100 Grade 1 qualified per -Q1 suffix; operating temperature -40C to +125C. RoHS and lead-free confirmed per TI product page. Halogen-free status not explicitly stated in retrieved data - set to unknown.
