TPS7B6933QDCYRQ1 - 40V 150mA LDO Regulator, 3.3V Fixed | TI
MPN： TPS7B6933QDCYRQ1 ✓ 啟用中TPS7B6933QDCYRQ1 概覽
An LDO (Low-Dropout) linear regulator is a type of voltage regulator that maintains a stable output voltage even when the input voltage is only slightly higher than the output. LDOs sit within the broader linear-regulator family, which is itself a subset of voltage regulators and power-management ICs. They are favored for low-noise, low-Iq rails because, unlike switching converters, they introduce no switching ripple into sensitive analog or microcontroller supply domains.
Key features include 15 µA typical quiescent current at light load, integrated short-circuit and overcurrent protection, thermal shutdown, and an extremely wide 4 V to 40 V input operating range that tolerates load-dump and cold-crank transients on 12 V automotive buses. The SOT-223 (DCY) package with exposed tab provides a low thermal resistance path, allowing the regulator to sustain 150 mA continuous load across the full automotive temperature range.
Architecturally, the TPS7B6933QDCYRQ1 uses a precision bandgap reference and a PNP pass element topology that achieves very low dropout and ultra-low Iq at light loads. The wide Vin window eliminates the need for a pre-regulator on 12 V or 24 V buses, simplifying BOM and saving PCB space in ECU modules.
Typical applications include automotive body control modules, ECU keep-alive supplies, sensor power rails, infotainment standby rails, and industrial 24 V loop-powered instruments. The fixed 3.3 V option is ideal for directly powering MCUs, CAN transceivers, and LIN slaves without additional regulation stages.
When designing with this device, place a 1 µF or larger ceramic input capacitor close to VIN, and a 2.2 µF or larger low-ESR ceramic output capacitor close to VOUT. Verify that worst-case dropout at 150 mA still keeps VIN above VOUT + Vdo across all transient conditions, and use the tab copper pour to keep junction temperature within limits.
This page synthesizes distributor pricing, AEC-Q100 drop-in alternatives, application circuit guidance, and practical design notes not consolidated on any single manufacturer or distributor page.
直接替換替代品，適用於 TPS7B6933QDCYRQ1 — 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： TPS7B6933QDCYRQ1 （相同外形與佔位） — 差異在於 Output Type, Output Voltage, Package.
TPS7B6933QDCYRQ1
✅ 直接替換聯絡詢價
查看資料表 →TPS7B6933DCYR
✅ 直接替換📋 參考替代品（不在目錄中）
TPS7B6925QDCYRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
TPS7B6950QDCYRQ1
✅ 直接替換聯絡詢價
查看資料表 →TPS7B6933QDBVRQ1
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4275A-3.3DSOT223
✅ 直接替換📋 參考替代品（不在目錄中）
AP7372-33SA-7
✅ 直接替換📋 參考替代品（不在目錄中）
TPS7B6933QDCYRQ1 最大額定值與電氣特性
| 輸出類型 | Fixed |
| 輸出電壓 | 3.3 V |
| Output Current | 150 mA |
| 輸入電壓範圍 | 4 V to 40 V |
| Quiescent Current (Iq) | 15 µA (typical, light load) |
| 工作溫度範圍 | -40 °C to +125 °C |
| 過熱關機 | Yes (integrated) |
| Short-Circuit Protection | Yes (integrated) |
| 封裝 | SOT-223-4 (DCY) with tab |
| 安裝類型 | Surface Mount |
| Automotive Qualification | AEC-Q100 Grade 1 |
| RoHS 狀態 | Compliant |
TPS7B6933QDCYRQ1 腳位配置
| 腳位 1 | VIN — Input voltage supply (4 V to 40 V) |
| 腳位 2 | GND — Ground reference |
| 腳位 3 | VOUT — Regulated 3.3 V output |
| 腳位 4 | TAB — Thermal pad and ground (must be soldered to PCB copper pour) |
典型應用
TPS7B6933QDCYRQ1 適用於 6 應用s: Automotive Body Control Module (BCM) Keep-Alive Supply, Automotive Sensor Power Rail (3.3 V), Infotainment Standby / Wake-Up Rail, Industrial 24 V Loop-Powered Instrument, Automotive Lighting Controller (LED Driver Pre-Rail), EV Battery Management System (BMS) Auxiliary Rail.
Automotive Body Control Module (BCM) Keep-Alive Supply
The TPS7B6933QDCYRQ1's 4 V to 40 V input range, 15 µA quiescent current, and AEC-Q100 Grade 1 qualification make it ideal for always-on automotive body control modules. It can be powered directly from the 12 V battery bus, surviving load-dump transients up to 40 V without a pre-regulator, while draining only microamps from the battery during key-off standby. The 3.3 V fixed output directly powers 3.3 V microcontrollers, CAN/LIN transceivers, and wake-up logic, eliminating a downstream buck stage. The SOT-223 tab provides enough thermal headroom for 150 mA continuous load even inside a sealed plastic BCM housing at 85 °C ambient.
推薦
Automotive Sensor Power Rail (3.3 V)
Pressure, position, and current sensors in automotive ECUs need a clean 3.3 V rail with low noise and stable regulation across the full automotive temperature range. The TPS7B6933QDCYRQ1's low output noise and high line rejection keep sensor ADC measurements accurate even as the 12 V bus swings through cranking and load-dump events. Its 150 mA continuous capability supports multi-sensor arrays, while the 15 µA Iq enables sensor modules that stay awake in low-power diagnostic modes. AEC-Q100 qualification is mandatory for safety-relevant sensor systems such as battery management and chassis control.
推薦
Infotainment Standby / Wake-Up Rail
Head units and telematics control units require an always-on 3.3 V standby rail that survives cranking transients and powers wake-up logic while the infotainment SoC is off. The TPS7B6933QDCYRQ1's 4-40 V input tolerates the full automotive transient envelope, and its 15 µA Iq keeps standby battery drain well under OEM budgets during weeks-long parking. The 3.3 V output is the standard voltage for Bluetooth/Wi-Fi companion modules and eMMC controllers in standby. AEC-Q100 Grade 1 qualification ensures reliability across under-hood and dashboard thermal environments.
推薦
Industrial 24 V Loop-Powered Instrument
Industrial process instruments and field transmitters running off a 24 V loop need a wide-input LDO that survives supply transients and delivers a clean low-voltage rail to ADCs and MCUs. The TPS7B6933QDCYRQ1's 4-40 V input window directly accepts industrial 24 V nominal rails with up to 40 V transient tolerance. Its 15 µA Iq and 3.3 V fixed output suit 4-20 mA loop-powered designs where total quiescent drain must stay under the loop's zero-scale margin. The SOT-223 package fits inside standard field-transmitter enclosures with adequate copper for thermal dissipation.
推薦
Automotive Lighting Controller (LED Driver Pre-Rail)
Exterior and interior LED lighting modules use a 3.3 V microcontroller rail to drive PWM logic, fault monitoring, and LIN communication. The TPS7B6933QDCYRQ1 provides this rail directly from the 12 V battery, with 40 V load-dump tolerance and AEC-Q100 Grade 1 qualification required for headlamp and tail-lamp ECUs. Its 150 mA continuous current is more than adequate for the logic section, while leaving the high-current LED drive stage on a separate switching converter downstream. The wide input range handles voltage spikes from inductive wiring harnesses typical in lighting subsystems.
推薦
EV Battery Management System (BMS) Auxiliary Rail
In EV battery management systems, a 12 V auxiliary rail derived from the high-voltage pack powers cell-balancing logic, isolation drivers, and BMS MCUs. The TPS7B6933QDCYRQ1's 4-40 V input accepts 12 V vehicle systems with cold-crank margin, while its 3.3 V fixed output supplies the BMS MCU and AFE logic rail. The 15 µA Iq supports low-power sleep modes between cell-balancing events, extending standby time. AEC-Q100 Grade 1 qualification is mandatory in EV safety systems, and the SOT-223 package provides adequate thermal dissipation for under-pack enclosures.
推薦
推薦產品摘要
工程參考資料，適用於 TPS7B6933QDCYRQ1 — 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 | TPS7B6933DCYR | TPS7B6925QDCYRQ1 | TPS7B6950QDCYRQ1 | TPS7B6933QDBVRQ1 | NCV4275A-3.3DSOT223 | AP7372-33SA-7 |
|---|---|---|---|---|---|---|---|
| Package | SOT-223-4 (DCY) | SOT-223-4 (DCY) - same | SOT-223-4 (DCY) - same | SOT-223-4 (DCY) - same | SOT-23-5 (DBV) - different footprint | SOT-223-4 - same | SOT-223-4 - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | onsemi | Diodes Incorporated |
| Output Voltage | 3.3 V fixed | 3.3 V fixed | 2.5 V fixed | 5.0 V fixed | 3.3 V fixed | 3.3 V fixed | 3.3 V fixed |
| Output Current | 150 mA | 150 mA | 150 mA | 150 mA | 150 mA | 450 mA | 150 mA |
| Input Voltage Range | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 5.5 V to 42 V | 4 V to 40 V |
| Automotive Grade (AEC-Q100) | Yes (Grade 1) | No (standard grade) | Yes (Grade 1) | Yes (Grade 1) | Yes (Grade 1) | Yes (Grade 1) | No (industrial) |
| Thermal Shutdown | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- AEC-Q100 Grade 1 automotive qualification at 40 V input (對比AP7372-33SA-7 (Diodes Incorporated))
- 15 µA typical quiescent current (對比NCV4275A-3.3DSOT223 (onsemi))
- Same SOT-223-4 footprint across the TPS7B69xx-Q1 family (對比TPS7B6933QDBVRQ1 (same family, different package))
設計說明
Place a 1 µF (or larger) X7R ceramic input capacitor within 5 mm of the VIN pin to suppress transient ringing from the 12 V bus inductance. Place a 2.2 µF (or larger) low-ESR ceramic output capacitor within 5 mm of VOUT, with the ground return via a short, wide trace to the package tab. The SOT-223 tab must be soldered to at least 100 mm² of 1 oz copper pour to achieve the rated thermal performance at 150 mA continuous load.
Estimated: at VIN = 14 V (running engine), VOUT = 3.3 V, and IOUT = 150 mA, internal dissipation is (14 - 3.3) × 0.150 = 1.605 W. With a SOT-223 θJA of approximately 50 °C/W on a 100 mm² copper pour, junction rise above ambient is ~80 °C. At 85 °C ambient this brings Tj to ~165 °C, dangerously close to the 170 °C thermal-shutdown threshold. For under-hood applications above 70 °C ambient, either downsize load current, increase copper area to ≥300 mm², or specify TPS7B6933QDBVRQ1 only for lighter loads.
Do not use the SOT-223 tab as the only ground connection on multi-layer PCBs - always provide a dedicated GND pin (pin 2) via in addition to the tab. Output capacitance below 2.2 µF or with high ESR (e.g., tantalum-only) can cause instability and oscillation under load steps - always use ceramic X7R/X5R. Reverse-polarity of VIN (even momentary) can permanently damage the device; consider adding a TVS diode such as SMAJ33CA on the input for harsh automotive environments.
Route the VIN and VOUT traces wide and short to minimize parasitic inductance that could couple switching noise from adjacent power stages. Keep the ground return path of input and output capacitors star-connected back to the GND pin to avoid ground bounce. If the LDO sits within 10 mm of a switching converter, add a small ferrite bead on VIN to attenuate high-frequency ripple injection into the LDO's reference.
合規資訊
AEC-Q100 Grade 1 automotive qualified per TI datasheet (TPS7B69xx-Q1 Rev. B). RoHS and REACH compliant per TI product page. Halogen-free status not explicitly stated in provided data - marked as 'unknown'. Conflict-minerals declaration compliant per TI policy.
