TPS78433QWDRBRQ1 - 300mA 3.3V AEC-Q100 LDO | Texas Instruments
MPN： TPS78433QWDRBRQ1 ✓ 啟用中TPS78433QWDRBRQ1 概覽
A low-dropout (LDO) regulator is a type of linear voltage regulator that maintains a stable output voltage using a series pass element, even when the input voltage is only slightly higher than the desired output. LDOs sit within the broader hierarchy of voltage regulators under power management ICs, and they are preferred over switching regulators when low noise, small footprint, and fast transient response matter more than conversion efficiency. The TPS78433QWDRBRQ1 targets always-on automotive subsystems where low quiescent current extends standby life on the vehicle battery.
Key features include a low quiescent current that preserves battery life in always-on systems, a high power-supply rejection ratio (PSRR) that attenuates upstream switching-converter ripple, and high output-voltage accuracy across line, load, and temperature. The device also integrates an active-high enable pin that supports power sequencing in multi-rail systems and a thermal-shutdown block that protects the die under fault conditions. The compact VSON-8 footprint suits module-level PCB layouts with strict area budgets.
Technically, the TPS784-Q1 family uses a PMOS pass topology to achieve low dropout, and its internal reference and feedback network are trimmed for tight initial accuracy. Stability is maintained with small ceramic output capacitors, simplifying BOM cost and PCB area. The wide operating range and automotive-grade qualification allow direct use under the hood, in body controllers, and in advanced driver-assistance system (ADAS) sensor supplies.
Typical applications include automotive camera modules, body and chassis controllers, ADAS sensor rails, infotainment head-unit auxiliary supplies, and always-on microcontroller rails in cluster and telematics modules. The fixed 3.3 V output suits low-power MCUs and CAN/LIN transceivers directly.
When designing with this device, ensure the input-to-output headroom is sufficient to keep the LDO in regulation at maximum load, and place input/output ceramic capacitors close to the pins. For applications sharing an automotive battery feed, follow OEM load-dump and reverse-battery protection guidance around the LDO input. This page synthesizes distributor pricing, AEC-Q100 drop-in alternatives, and practical automotive design notes not bundled in the manufacturer datasheet alone.
直接替換替代品，適用於 TPS78433QWDRBRQ1 — 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。
TPS78430QWDRBRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS78425QWDRBRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS78418QWDRBRQ1
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
TPS7A2010PDBVR
✅ 直接替換📋 參考替代品（不在目錄中）
TLV70033DDCR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS78433QWDRBRQ1 最大額定值與電氣特性
| 輸出類型 | Fixed (3.3 V) |
| 輸出電壓 | 3.3 V |
| Output Voltage Accuracy | 1.5% (typical, over line/load/temperature) |
| 最大輸出電流 | 300 mA |
| 輸入電壓範圍 | 1.65 V to 6.0 V |
| 致能腳位 | Yes (active-high) |
| 過熱關機 | Yes (integrated) |
| Operating Temperature (Ambient, TA) | -40 °C to +125 °C |
| Junction Temperature Range (TJ) | -40 °C to +150 °C |
| 封裝 | VSON-8 (DRB) 3 x 3 mm |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant |
| AEC-Q100 Grade | Grade 1 (qualified for automotive) |
TPS78433QWDRBRQ1 腳位配置
| 腳位 1 | IN — Input voltage supply |
| 腳位 2 | IN — Input voltage supply (tied to pin 1) |
| 腳位 3 | EN — Enable (active-high) |
| 腳位 4 | NC — Not connected (per datasheet) |
| 腳位 5 | GND — Ground |
| 腳位 6 | NC — Not connected (per datasheet) |
| 腳位 7 | OUT — Regulated 3.3 V output |
| 腳位 8 | OUT — Regulated 3.3 V output (tied to pin 7) |
| 腳位 EP | PAD — Exposed thermal pad - connect to GND for thermal dissipation |
典型應用
TPS78433QWDRBRQ1 適用於 6 應用s: Automotive Camera Module Power, Body and Chassis Controllers, ADAS Sensor Power (Radar/LiDAR), Infotainment Auxiliary Supplies, Cluster and Telematics MCU Rails, Industrial IoT Gateways with Automotive Heritage.
Automotive Camera Module Power
The TPS78433QWDRBRQ1 delivers a clean fixed 3.3 V rail for automotive front, rear, and surround-view camera modules. Its 300 mA continuous rating easily supports image-sensor AVDD plus serializer logic, and AEC-Q100 Grade 1 qualification covers underhood and behind-bumper thermal stress. Compared with a switching regulator, the LDO adds no EMI switching noise into the image-sensor analog path, which preserves SNR in low-light conditions. The VSON-8 (DRB) 3 x 3 mm footprint fits the tight module stack-up of compact automotive cameras.
推薦
Body and Chassis Controllers
Body controllers (BCM), door modules, and chassis ECUs use 3.3 V rails for MCUs, CAN/LIN transceivers, and load-driver logic. The TPS78433QWDRBRQ1's wide 1.65 V to 6.0 V input lets the rail ride directly on a 5 V pre-regulated bus or a loosely regulated battery feed, while the active-high enable pin supports ignition-aware power sequencing. AEC-Q100 Grade 1 ensures reliable operation in sealed under-dash modules that can see ambient swings to +125 °C. The exposed-pad VSON-8 package provides low thermal resistance for continuous 300 mA bias currents.
推薦
ADAS Sensor Power (Radar/LiDAR)
Advanced driver-assistance sensor boards require low-noise, post-regulated rails for analog front-ends and high-speed serializers. The TPS78433QWDRBRQ1's high PSRR attenuates ripple from upstream automotive buck regulators, protecting radar MMIC and LiDAR photodiode analog paths. The 300 mA rating covers combined analog + digital blocks, and AEC-Q100 Grade 1 supports behind-grille and roof-mount sensor placement. The fixed 3.3 V output eliminates external feedback components, reducing PCB area on space-constrained sensor PCBs.
推薦
Infotainment Auxiliary Supplies
Infotainment head units and rear-seat entertainment modules draw auxiliary 3.3 V rails for HMI microcontrollers, audio DSPs, and display backlight drivers. The TPS78433QWDRBRQ1's low quiescent current preserves quiescent battery drain when the infotainment system is in standby, while the 300 mA capability supports peak DSP and backlight bursts. The VSON-8 (DRB) footprint suits the dense multi-layer PCBs of head-unit mainboards.
推薦
Cluster and Telematics MCU Rails
Instrument clusters, gateway ECUs, and telematics control units need always-on 3.3 V rails for low-power microcontrollers and CAN-FD transceivers. The TPS78433QWDRBRQ1's low-IQ architecture minimizes quiescent battery drain during key-off, which is critical for OEM quiescent-current budgets. AEC-Q100 Grade 1 supports behind-dash mounting, and the 6.0 V maximum VIN tolerates load-dump transients when paired with an upstream protection network.
推薦
Industrial IoT Gateways with Automotive Heritage
Industrial IoT and fleet-management gateways that benefit from automotive-grade reliability can use the TPS78433QWDRBRQ1 as a robust 3.3 V rail for MCUs and NB-IoT/LTE-M modems. Its wide temperature range and AEC-Q100 qualification deliver automotive-grade resilience in harsh industrial cabinets. The VSON-8 (DRB) footprint is footprint-compatible with industrial designs migrating from commercial-grade LDOs, and the enable pin supports module-level power gating.
推薦
推薦產品摘要
工程參考資料，適用於 TPS78433QWDRBRQ1 — 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 | TPS78430QWDRBRQ1 | TPS78425QWDRBRQ1 | TPS78418QWDRBRQ1 | TPS7A2010PDBVR | TLV70033DDCR |
|---|---|---|---|---|---|---|
| Package | VSON-8 (DRB) 3x3 mm | VSON-8 (DRB) 3x3 mm - same | VSON-8 (DRB) 3x3 mm - same | VSON-8 (DRB) 3x3 mm - same | SOT-23-5 (DBV) - different footprint | SOT-23-5 (DDC) - different footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | 3.3 V fixed | 3.0 V fixed | 2.5 V fixed | 1.8 V fixed | Adjustable | 3.3 V fixed |
| Output Current | 300 mA | 300 mA | 300 mA | 300 mA | 300 mA | 200 mA |
| Input Voltage Range | 1.65 V to 6.0 V | 1.65 V to 6.0 V | 1.65 V to 6.0 V | 1.65 V to 6.0 V | 1.5 V to 6.0 V (max 18 V transient on TPS7A20 family) | 2.0 V to 5.5 V |
| AEC-Q100 Qualification | Grade 1 (-40C to +125C ambient) | Grade 1 (-40C to +125C ambient) | Grade 1 (-40C to +125C ambient) | Grade 1 (-40C to +125C ambient) | Grade 1 (TPS7A20 family automotive variant) | Not automotive qualified |
| Enable Pin | Yes | Yes | Yes | Yes | Yes | Yes |
| Output Capacitor Type | Ceramic (low ESR) | Ceramic (low ESR) | Ceramic (low ESR) | Ceramic (low ESR) | Ceramic (low ESR) | Ceramic (low ESR) |
主要差異化特點
- AEC-Q100 Grade 1 qualified with VSON-8 exposed-pad thermal footprint (對比TLV70033DDCR)
- Higher 300 mA continuous output rating in VSON-8 (對比TPS7A2010PDBVR)
- Wide 1.65 V to 6.0 V input range with low IQ (對比TLV70033DDCR)
設計說明
Estimated: At VIN = 5.0 V, VOUT = 3.3 V, and 300 mA full load, power dissipation is (5.0 - 3.3) * 0.3 = 0.51 W. The VSON-8 (DRB) 3 x 3 mm package dissipates this through the exposed thermal pad; the datasheet theta_JA figure should be confirmed for the actual PCB copper area. For continuous 300 mA bias at +85 °C ambient, attach the EP pad to a GND copper pour of at least 1 square inch with thermal vias to maintain junction temperature below +150 °C.
Place the input and output ceramic capacitors as close as possible to the IN and OUT pins of the TPS78433QWDRBRQ1 to minimize parasitic inductance. Use a 1 µF X7R ceramic on the input and a 1 µF X7R ceramic on the output as a starting point, and confirm stability with the actual PCB layout. The enable pin (EN) should be tied to IN via a 100 kΩ pull-up if not driven by an MCU GPIO, and a 0.1 µF bypass cap on EN improves noise immunity.
Do not assume the TPS78433QWDRBRQ1's 6.0 V absolute-max VIN survives an automotive load-dump event; add a TVS clamp or upstream pre-regulator for 12 V battery systems. Avoid reverse-battery polarity on VIN - automotive designs typically include a series diode or P-FET reverse-protection block. Verify the EN pin voltage never exceeds its absolute-max rating, especially during transients.
合規資訊
AEC-Q100 Grade 1 qualified per TI product page ('Automotive, 300-mA, low-IQ, high-PSRR, LDO voltage regulator with high accuracy and enable'). RoHS compliance confirmed via TI product page; halogen-free status not explicitly listed in the verified web data and set to 'unknown'.
