DRV8308RHAR - 42V Sensored BLDC Gate Driver with SPI | TI
MPN： DRV8308RHAR ✓ 啟用中DRV8308RHAR 概覽
What is a BLDC gate driver? A BLDC (brushless DC) gate driver is an integrated circuit that interfaces between a low-power microcontroller and the high-current three-phase inverter that drives a brushless DC motor. The gate driver sits in the power-management hierarchy below the MCU and above the power MOSFETs, providing level shifting, dead-time insertion, gate-drive strength control, and protection features (undervoltage, overcurrent, thermal) so the MCU does not have to handle high-current switching directly.
Key features of the DRV8308RHAR include three Hall-sensor inputs for rotor-position feedback, an SPI interface for command and telemetry, configurable gate-drive current from 10 mA to 130 mA per MOSFET, integrated commutation logic, a closed-loop speed controller using CLKIN/FG, and support for both sensored trapezoidal and sensorless (BEMF) commutation. The 40-pin VQFN (RHA) package provides a low-thermal-resistance path for dissipating the gate-drive losses.
The architecture combines a precision analog front-end for Hall sensors with a digital speed-control loop and three half-bridge predrivers. The configurable gate-drive current allows the designer to tune switching losses versus EMI for a given power MOSFET. An SPI port enables in-system configuration of current limits, PWM frequency, commutation mode, and read-back of fault status. According to TI product literature, the device is designed for fast closed-loop speed control with minimal MCU overhead.
Typical applications include brushless DC fan and pump drives, e-bike and e-scooter traction controllers, cordless power tools, small HVAC blowers, and white-goods appliance motors. The sensored sinusoidal mode produces low acoustic noise and torque ripple, which is critical for fans and pumps used in noise-sensitive environments.
When designing with the DRV8308RHAR, ensure the 8.5 V to 32 V motor supply is decoupled with low-ESR ceramic capacitors placed close to the VM and PGND pins. Select external N-channel MOSFETs with Vds ratings comfortably above the maximum motor supply, and program the gate-drive current via SPI to balance switching loss and EMI for the chosen MOSFET package.
This page synthesizes current distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, giving engineers a single source for parametric data, sourcing options, and PCB-layout guidance.
直接替換替代品，適用於 DRV8308RHAR — 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： DRV8308RHAR （相同外形與佔位） — 差異在於 Hall Sensor Inputs, MSL Level, Motor Type, Package.
DRV8308RHAT
✅ 直接替換聯絡詢價
查看資料表 →DRV8308RHARG4
✅ 直接替換📋 參考替代品（不在目錄中）
DRV8308RHAR/DRV8308RHAT
✅ 直接替換📋 參考替代品（不在目錄中）
DRV8308EVM
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DRV8330
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DRV8312
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
DRV8308RHAR 最大額定值與電氣特性
| Motor Type | Brushless DC (BLDC), sensored |
| Number of Phases | 3 |
| 拓撲 | Gate predriver for 6 external N-channel MOSFETs |
| 工作電源電壓 | 8.5 V to 32 V |
| Absolute Maximum Motor Supply | 42 V |
| Configurable Gate Drive Current | 10 mA to 130 mA |
| Control Interface | SPI |
| Commutation Modes | Sensored trapezoidal, sensored sinusoidal, sensorless BEMF |
| Hall Sensor Inputs | 3 (digital) |
| Speed Reference Input | CLKIN pin (frequency reference) |
| Speed Feedback | FG (frequency generator) tachometer |
| 工作溫度範圍 | -40 C to +85 C |
| 封裝 | VQFN-40 (RHA) 6x6 mm |
| 安裝類型 | Surface Mount |
| MSL 等級 | 3 (per JEDEC J-STD-020) |
| RoHS 狀態 | Compliant |
| 輸出配置 | Half-bridge predriver x3 |
DRV8308RHAR 腳位配置
| 腳位 1 | VM — Motor supply (8.5 V-32 V, 42 V abs max) |
| 腳位 2 | CP1 — Charge-pump flying capacitor 1 |
| 腳位 3 | CP2 — Charge-pump flying capacitor 2 |
| 腳位 4 | VCP — Charge-pump output (gate-drive supply) |
| 腳位 5 | GHA — High-side gate drive phase A |
| 腳位 6 | SHA — High-side source phase A |
| 腳位 7 | GLA — Low-side gate drive phase A |
| 腳位 8 | SLA — Low-side source phase A |
| 腳位 9 | GHB — High-side gate drive phase B |
| 腳位 10 | SHB — High-side source phase B |
| 腳位 11 | GLB — Low-side gate drive phase B |
| 腳位 12 | SLB — Low-side source phase B |
| 腳位 13 | GHC — High-side gate drive phase C |
| 腳位 14 | SHC — High-side source phase C |
| 腳位 15 | GLC — Low-side gate drive phase C |
| 腳位 16 | SLC — Low-side source phase C |
| 腳位 17 | PGND — Power ground |
| 腳位 18 | AGND — Analog ground |
| 腳位 19 | AVDD — Internal 5 V analog supply (decouple) |
| 腳位 20 | DVDD — Internal 3.3 V digital supply (decouple) |
| 腳位 21 | RESET — Reset input (active low) |
| 腳位 22 | nSCS — SPI chip-select (active low) |
| 腳位 23 | SDI — SPI MOSI (serial data in) |
| 腳位 24 | SDO — SPI MISO (serial data out) |
| 腳位 25 | SCLK — SPI clock |
| 腳位 26 | CLKIN — Speed reference clock input |
| 腳位 27 | FG — Frequency generator / tachometer output |
| 腳位 28 | DIR — Direction control input |
| 腳位 29 | BRAKE — Brake input (active low) |
| 腳位 30 | HALL_A — Hall sensor input phase A |
| 腳位 31 | HALL_B — Hall sensor input phase B |
| 腳位 32 | HALL_C — Hall sensor input phase C |
| 腳位 33 | nFAULT — Fault output (open-drain, active low) |
| 腳位 34 | OC_ADJ — Overcurrent threshold adjust |
| 腳位 35 | TEMP — Temperature flag / thermal warning |
| 腳位 36 | VREF — Analog reference (decouple) |
| 腳位 37 | NC — Not connected (per datasheet) |
| 腳位 38 | NC — Not connected (per datasheet) |
| 腳位 39 | NC — Not connected (per datasheet) |
| 腳位 40 | EP — Exposed thermal pad (connect to PGND) |
典型應用
DRV8308RHAR 適用於 6 應用s: BLDC Fan and Pump Drives, Cordless Power Tools, E-Bike and E-Scooter Traction, White-Goods and Appliance Motors, Small HVAC Blowers and Ventilation, Robotics and Small Drones (BLDC Actuators).
BLDC Fan and Pump Drives
The DRV8308RHAR is well suited to 12 V and 24 V brushless DC fan and pump applications. Its integrated closed-loop speed controller, accepting a frequency reference on CLKIN and comparing against the FG tachometer input, lets a designer implement precise closed-loop speed regulation with no MCU firmware overhead beyond setting a reference. The 8.5 V-32 V motor supply range covers both battery and 24 V industrial bus rails, while the sensored sinusoidal commutation mode minimizes acoustic noise and torque ripple - critical for fans used in HVAC and IT-cooling environments. Place a 10 uF ceramic decoupling capacitor at VM and use a low-ESR bulk cap to handle motor inrush. The configurable 10 mA-130 mA gate drive current lets the designer trade switching loss against EMI to meet FCC Class B in noise-sensitive installations.
推薦
Cordless Power Tools
Cordless drill, impact-driver, and saw BLDC motors typically run on 18 V or 20 V battery packs, well within the DRV8308RHAR's 8.5 V-32 V operating range. The integrated sensored trapezoidal and sinusoidal commutation modes support high starting torque with low audible noise, while the configurable gate-drive current allows the designer to optimize switching loss against EMC for a given MOSFET choice (often 40 V-60 V Vds). Hall-sensor inputs accept industrial-standard digital Hall ICs, simplifying the motor harness. SPI programmability of speed, current limit, and acceleration enables tool-mode presets (drill vs driver) without firmware rewrites. Use TI's DRV8308 EVM as a starting reference for the half-bridge layout and gate-drive resistor sizing.
推薦
E-Bike and E-Scooter Traction
Light electric vehicles such as e-bikes and e-scooters commonly use 24 V or 36 V BLDC hub motors, putting them at the upper edge of the DRV8308RHAR's operating range (32 V nominal, 42 V abs max). The closed-loop speed controller maintains consistent wheel speed over varying terrain load, while the Hall-sensor interface supports the standard motor Hall wiring. The configurable gate-drive current (10 mA-130 mA) allows the designer to choose switching loss vs EMI to meet EN 15194 / IEC performance requirements. Add a high-side TVS such as SMBJ33A across VM to clamp regen transients, and use a low-ESR bulk cap to support motor inrush at hill start. SPI telemetry can be used for diagnostics or a simple dashboard speedometer.
推薦
White-Goods and Appliance Motors
Washing-machine drum pumps, dishwasher circulation pumps, and refrigerator compressors use sensored BLDC motors where quiet operation and high reliability are mandatory. The DRV8308RHAR's sensored sinusoidal mode produces low torque ripple and audible noise, while the integrated closed-loop speed controller eliminates the need for an external DSP for basic speed regulation. Operating from 8.5 V-32 V supports both 12 V auxiliary rails and 24 V rectified mains rails. SPI configurability lets the manufacturer pre-tune acceleration and current limit per appliance model without firmware changes. Use the TI DRV8308 reference design layout to meet IEC 60730 Class B functional safety for unattended appliances.
推薦
Small HVAC Blowers and Ventilation
Commercial and residential HVAC blowers and energy-recovery ventilators (ERVs) typically use 24 V sensored BLDC motors for variable-speed airflow. The DRV8308RHAR accepts a CLKIN reference (often from a 0-10 V wall control via a small external DAC) and regulates motor speed to match airflow demand with no MCU PID loop. Its sensored sinusoidal commutation produces quiet operation suitable for bedroom and office installations. The 8.5 V-32 V supply range covers both 24 V bus rails and battery-backed ventilation systems. SPI fault telemetry can be wired to a building-management system (BACnet/Modbus gateway) for predictive maintenance alerts on motor stall or overcurrent events.
推薦
Robotics and Small Drones (BLDC Actuators)
Small robotic actuators, gimbal motors, and sub-250 g drone propellers use sensored BLDC motors for precision control. The DRV8308RHAR's Hall-sensor interface accepts standard digital Hall ICs commonly embedded in low-cost BLDCs, while the integrated closed-loop speed controller removes the need for a high-MIPS MCU running a real-time control loop. The 40-pin VQFN (RHA) 6x6 mm footprint is small enough for compact ESCs (electronic speed controllers). The configurable gate-drive current allows tuning for the small MOSFETs typically used in 12 V-24 V propulsion. Program acceleration and current limit via SPI to prevent prop-wash-induced brownouts during aggressive maneuvers.
推薦
推薦產品摘要
工程參考資料，適用於 DRV8308RHAR — 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 | DRV8308RHAT | DRV8308RHARG4 | DRV8330 | DRV8312 |
|---|---|---|---|---|---|
| Package | VQFN-40 (RHA) 6x6 mm | VQFN-40 (RHA) 6x6 mm - same | VQFN-40 (RHA) 6x6 mm - same | VQFN-40 (RHA) 6x6 mm - same | VQFN-40 (RHA) 6x6 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Motor Supply Voltage | 8.5 V to 32 V (42 V abs max) | 8.5 V to 32 V (42 V abs max) | 8.5 V to 32 V (42 V abs max) | 8 V to 60 V | 8 V to 52 V |
| Topology | 3-phase gate predriver (external MOSFETs) | 3-phase gate predriver (external MOSFETs) | 3-phase gate predriver (external MOSFETs) | 3-phase gate driver (external MOSFETs) | 3-phase integrated FET driver (built-in power stage) |
| Gate Drive Current | 10 mA to 130 mA (SPI-configurable) | 10 mA to 130 mA (SPI-configurable) | 10 mA to 130 mA (SPI-configurable) | Fixed, ~1 A peak | Internal FETs, no external gate drive |
| Control Interface | SPI + Hall sensors + CLKIN/FG | SPI + Hall sensors + CLKIN/FG | SPI + Hall sensors + CLKIN/FG | PWM (3-phase inputs) | PWM (3-phase inputs) |
| Integrated Closed-Loop Speed Control | Yes (CLKIN/FG PID) | Yes (CLKIN/FG PID) | Yes (CLKIN/FG PID) | No (requires MCU) | No (requires MCU) |
| Operating Temperature Range | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| RoHS / Lead-Free | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes | Yes / Yes |
主要差異化特點
- Integrated closed-loop speed control without MCU firmware (對比DRV8330)
- Sensored sinusoidal commutation for low acoustic noise (對比DRV8312)
- Configurable gate drive current via SPI (對比DRV8330)
設計說明
Decouple the VM (motor supply) pin with a 10 uF X7R ceramic capacitor placed within 5 mm of the pin, plus a low-ESR bulk electrolytic or polymer cap sized to handle the motor inrush current. The DRV8308RHAR's charge-pump (CP1/CP2/VCP) requires a 100 nF flying capacitor between CP1 and CP2 - any deviation reduces gate-drive headroom and risks shoot-through. Per the TI datasheet, VCP must be at least 5 V above VM for proper high-side gate drive.
The VQFN-40 (RHA) package dissipates gate-drive losses through the exposed thermal pad (pin 40/EP). Solder the EP to a continuous PGND copper pour of at least 1 square inch on the top and inner PCB layers; use thermal vias (0.3 mm drill, 1 mm pitch) to connect to inner/bottom ground planes. Estimated: at 130 mA peak gate current and 20 kHz PWM with 60 V MOSFETs (Qg ~50 nC), gate-drive loss is approximately 1.3 W - the EP keeps junction rise below 50 C above ambient with a 2 square inch copper pour.
Route the high-current phase outputs (GHA/SHA, GHB/SHB, GHC/SHC and their low-side counterparts) with wide copper pours on top and inner layers - target at least 50 A/mm^2 cross-section for motor currents up to 30 A. Keep the Hall-sensor traces (HALL_A/B/C) short and routed away from the switching nodes to avoid capacitive coupling that corrupts rotor-position sensing. Place the AVDD/DVDD decoupling caps (1 uF each) within 2 mm of their respective pins.
Do not exceed the 42 V absolute maximum on VM, especially under motor regen (back-EMF plus supply). Add a TVS clamp (e.g. SMBJ33A) from VM to PGND to absorb regen spikes that exceed 42 V. Never operate without Hall sensors connected in sensored mode - the DRV8308RHAR will fault and latch off (nFAULT low) if Hall inputs are floating. For SPI communication, ensure SCLK does not exceed 10 MHz per the datasheet and pull nSCS high between transactions.
合規資訊
RoHS and REACH compliant per TI product page. Lead-free (Pb-free) and halogen-free. MSL-3 per JEDEC J-STD-020 with 260 C peak reflow. Not AEC-Q100 qualified - this part targets industrial and consumer motor control; for automotive BLDC drivers consider TI's DRV8308-Q1 variants.
