NCV4274ADS50R4G - 400mA 5V Fixed LDO Regulator | onsemi
MPN： NCV4274ADS50R4G ✓ 啟用中NCV4274ADS50R4G 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 very close to the output voltage, by using a pass transistor operating in the linear region rather than a switching element. The LDO belongs to the broader category of linear regulators, which sit within voltage regulators, which are part of power management ICs. LDOs are preferred over switching regulators wherever low output noise, fast line-load response, and minimal external component count are critical, although they dissipate (VIN − VOUT) × IOUT as heat.
Key features include a low 250 mV typical dropout voltage at full 400 mA load, a low quiescent current of only 150 µA with a 1.0 mA load, and integrated protection functions including over-current, over-temperature, and reverse-input protection. The D2PAK package offers low thermal resistance for heat extraction in harsh environments, while the automotive-compliant NCV designator confirms PPAP documentation availability.
The device uses a precision bandgap reference and an internal PNP pass transistor architecture to achieve tight line and load regulation. The wide input voltage tolerance supports load-dump and jump-start transients common in 12 V and 24 V automotive systems without additional front-end protection.
Typical applications include automotive body electronics, infotainment and instrument cluster power rails, industrial 24 V sensor supplies, and any post-regulation stage that requires a clean 5 V rail from a higher-voltage battery bus. When ordering panels, the "50" suffix denotes 5.0 V output and "ADS50R4G" indicates the D2PAK package on a 800-unit reel.
When designing with this device, derate the output current according to PCB copper pour and ambient. Pickups for both input and output capacitors should be low-ESR ceramic or tantalum and placed as close to the IC pins as possible. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 NCV4274ADS50R4G — 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。
NCV4274CDS50R4G
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4274ADS50G
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4274DS50R4G
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4274ADS33R4G
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4274ADS25R4G
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4275ADS50R4G
✅ 直接替換📋 參考替代品（不在目錄中）
NCV4274ADS50R4G 最大額定值與電氣特性
| 輸出類型 | Fixed |
| 輸出電壓 | 5.0 V |
| Output Accuracy | ±2% (A version) |
| 最大輸出電流 | 400 mA |
| 輸入電壓範圍 | 5.5 V to 40 V |
| 壓降電壓 | 250 mV typical at 400 mA (max 500 mV) |
| 靜態電流 | 150 µA at 1 mA load |
| 工作溫度範圍 | -40 °C to +125 °C |
| 封裝 | D2PAK-3 (TO-263, case outline 418AF) |
| 安裝類型 | Surface Mount |
| MSL 等級 | MSL 1 |
| MSL Peak Temp | 260 °C |
| Reel Quantity | 800 per reel |
| Protection Features | Over-current, over-temperature, reverse-input protection |
| Automotive Qualification | AEC-Q100 (NCV prefix, Pb-free) |
| RoHS 狀態 | Compliant (Pb-free) |
NCV4274ADS50R4G 腳位配置
| 腳位 1 | VIN — Input voltage (5.5 V to 40 V) |
| 腳位 2 | GND — Ground reference |
| 腳位 3 | VOUT — Regulated 5.0 V output (also connected to exposed tab) |
| 腳位 Tab | VOUT/Thermal Pad — Output and thermal dissipation tab; must be soldered to copper |
典型應用
NCV4274ADS50R4G 適用於 6 應用s: Automotive Body Electronics, Instrument Cluster Power Rail, Industrial 24 V Sensor Supply, Infotainment and Head-Unit Subsystem, Battery-Backed Always-On Circuits, Post-Regulation After Switching Converter.
Automotive Body Electronics
The NCV4274ADS50R4G fits automotive body modules because of its 5.5 V to 40 V input range that survives load-dump transients up to 40 V on a 12 V battery bus, plus AEC-Q100 qualification. With 400 mA output and a fixed 5.0 V rail, it directly supplies BCM loads such as door controllers, mirror adjusters, and lighting drivers. The 150 µA quiescent current keeps parasitic draw low for always-on key-off circuits, and the integrated over-current, over-temperature, and reverse-input protection eliminates external protection components.
推薦
Instrument Cluster Power Rail
The NCV4274ADS50R4G provides a clean 5.0 V supply for gauges, indicator LEDs, and small microcontroller rails in instrument clusters. Its ±2% output accuracy and 250 mV dropout at 400 mA ensure stable operation during cold-crank when battery bus drops below 6 V. Compared to a switching regulator, the LDO adds no switching noise to the analog measurement circuits that share the cluster ground. The D2PAK-3 package handles thermal dissipation for sustained backlight and motor loads behind the cluster.
推薦
Industrial 24 V Sensor Supply
The NCV4274ADS50R4G operates directly from a 24 V industrial bus (18 V to 32 V nominal) and post-regulates to 5 V for analog sensors, PLC logic, and isolated transceiver rails. With 400 mA output, it can power multi-sensor manifolds with HART, 4-20 mA, and digital I/O interfaces simultaneously. Its 40 V maximum input withstands the inductive kick from relay coils and motor starters sharing the bus, and the AEC-Q100 automotive-grade silicon gives superior reliability versus consumer-grade regulators.
推薦
Infotainment and Head-Unit Subsystem
The NCV4274ADS50R4G provides a stable 5.0 V rail for infotainment subsystems such as USB charging controllers, audio codec logic supplies, and Bluetooth/WiFi module rails. Its 250 mV dropout at full load and 5.5 V to 40 V input support cranking profiles on 12 V automotive batteries without output sag. The integrated thermal shutdown and over-current protection prevent fault propagation into shared head-unit power buses. Use it as a post-regulator downstream of a front-end switching converter to clean up switching ripple for noise-sensitive audio stages.
推薦
Battery-Backed Always-On Circuits
The NCV4274ADS50R4G suits always-on automotive key-off circuits such as CAN transceivers, wake-up controllers, and immobilizer logic because its 150 µA quiescent current adds minimal parasitic drain (under 0.75 mW at 5 V). The 5.5 V to 40 V input allows direct connection to the battery bus without pre-regulation. The integrated reverse-input protection prevents damage if the battery is connected with reversed polarity during service, a real-world concern for body controllers that remain connected during vehicle storage.
推薦
Post-Regulation After Switching Converter
The NCV4274ADS50R4G is commonly used as a post-regulator downstream of a switching buck converter to provide a clean 5.0 V rail for noise-sensitive analog, RF, or sensor circuits. While the buck converter handles the bulk voltage step-down at high efficiency, this LDO removes switching ripple by 60+ dB and provides fast transient response. The 250 mV dropout allows operation from a 5.25 V buck output at full 400 mA load, and the D2PAK-3 package handles the residual (VIN-LDO) × I power dissipation.
推薦
推薦產品摘要
工程參考資料，適用於 NCV4274ADS50R4G — 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 | NCV4274CDS50R4G | NCV4274ADS50G | NCV4274DS50R4G | NCV4274ADS33R4G | NCV4274ADS25R4G | NCV4275ADS50R4G |
|---|---|---|---|---|---|---|---|
| Package | D2PAK-3 | D2PAK-3 - same | D2PAK-3 - same | D2PAK-3 - same | D2PAK-3 - same | D2PAK-3 - same | D2PAK-3 - same |
| Brand | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi | onsemi |
| Output Voltage | 5.0 V | 5.0 V | 5.0 V | 5.0 V | 3.3 V | 2.5 V | 5.0 V |
| Output Accuracy | ±2% (A version) | ±4% (C version) | ±2% | ±4% | ±2% | ±2% | ±2% |
| Maximum Output Current | 400 mA | 400 mA | 600 mA | 400 mA | 400 mA | 400 mA | 450 mA |
| Input Voltage Range | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 40 V | 5.5 V to 42 V |
| Quiescent Current | 150 µA | 150 µA | 150 µA | 150 µA | 150 µA | 150 µA | 100 µA |
| Dropout Voltage (typ) | 250 mV at 400 mA | 250 mV at 400 mA | 250 mV at 600 mA | 250 mV at 400 mA | 250 mV at 400 mA | 250 mV at 400 mA | 250 mV at 450 mA |
| AEC-Q100 Qualified | Yes | Yes | Yes | Yes | Yes | Yes | Yes |
主要差異化特點
- AEC-Q100 qualified for automotive applications (對比LM7805CT/NOPB)
- Wide 40 V input withstands load-dump transients (對比LM7805L-TA3-T)
- Low 150 µA quiescent current for always-on circuits (對比LM7805CT/NOPB)
設計說明
Estimated: at VIN=14 V (typical automotive battery), VOUT=5 V, and 400 mA load, the NCV4274ADS50R4G dissipates (14-5) × 0.4 = 3.6 W. With the D2PAK-3 package thermal resistance of approximately 31 °C/W on a 1 oz copper pour of 1 sq-inch, junction temperature rise is 3.6 × 31 = 112 °C above ambient. At 25 °C ambient the junction reaches 137 °C, near the 150 °C thermal-shutdown limit. Use at least 2 sq-inches of copper pour or add a small heatsink to keep Tj below 125 °C at full load.
Place the input capacitor (minimum 1 µF low-ESR ceramic) within 5 mm of the VIN pin to suppress input-inductance ringing. The output capacitor (minimum 10 µF, ESR < 1 Ω, ceramic or tantalum) must be within 10 mm of VOUT. The exposed tab is electrically VOUT and must be soldered to a copper area of at least 100 mm² to meet the 400 mA rating. Keep high-current traces wide (≥ 1 mm per 100 mA) to minimize voltage drop and thermal hot spots.
Do not operate VIN below 5.5 V or the regulator will drop out of regulation. Do not exceed 40 V continuous on VIN - although the part is rated to 40 V, sustained operation near the limit reduces reliability. The output capacitor ESR must stay within the datasheet stability window (typically < 1 Ω) - low-ESR ceramic capacitors are acceptable but avoid pure polymer or ultra-low-ESR parts below 10 mΩ without checking the datasheet ESR vs stability curve. Do not leave the output floating - some LDO variants require minimum load for stability.
合規資訊
Pb-free and RoHS compliant per onsemi product page. AEC-Q100 qualified - suitable for automotive applications. PPAP documentation available on request.
