STMicroelectronics L5970ADTR High-Current Step-Down Regulator Overview
The STMicroelectronics L5970ADTR is a robust, high-current synchronous step-down (buck) regulator engineered for rugged B2B applications-including Industrial Automation (PLCs, motor drives), Automotive Electronics (infotainment systems, sensor modules), and Home Appliances (high-power kitchen devices). Designed to convert a 4.5V?C40V input voltage range to an adjustable 1.2V?C37V output (with 3A continuous current capacity), it delivers stable, high-power performance to voltage-sensitive components like industrial microcontrollers, automotive ECUs, and appliance motor controllers. Integrating a synchronous rectifier, pulse-width modulation (PWM) control, overcurrent protection, thermal shutdown, and short-circuit protection into a durable TO252 (Surface-Mount Transistor 252) package, it operates reliably across -40??C to +150??C-making it a top choice for engineers prioritizing ruggedness, high current handling, and wide voltage flexibility in harsh industrial or automotive environments.
As a trusted power management product from STMicroelectronics-a global leader in semiconductor solutions for industrial and automotive sectors with decades of expertise-this regulator meets strict quality standards (AEC-Q100 Grade 1 certification for automotive use, RoHS 2 compliance, and ISO 9001 certification) and undergoes 2,000+ hours of durability testing. Senior engineers at a leading industrial automation firm endorse it, noting: ??The L5970ADTR??s 3A current capacity and TO252 thermal performance let us power our 24V PLC modules without overheating-even in 50??C factory conditions. It??s reduced our field failures by 35%.?? For more reliable industrial and automotive-focused ICs, visit ICメーカー.
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Technical Parameters of STMicroelectronics L5970ADTR
| パラメータ | 仕様 |
|---|---|
| 機能 | Synchronous step-down (buck) regulator (adjustable 1.2V?C37V output, PWM control) |
| 入力電圧範囲 | 4.5V to 40V |
| 調整可能な出力電圧範囲 | 1.2V to 37V (??2% accuracy at 25??C) |
| 最大連続出力電流 | 3A |
| ピーク出力電流 | 5A (short-duration, ??100ms) |
| ドロップアウト電圧 | 0.5V (typical, at 2A load) |
| パッケージタイプ | TO252-5 surface-mount package (thermal resistance: 35??C/W) |
| パッケージ寸法 | 6.5mm x 6.1mm x 2.3mm |
| 動作温度範囲 | -40～+150 |
| ピーク効率 | 92% (typical, 12V input, 5V output, 2A load) |
| スイッチング周波数 | 300kHz (fixed, no external adjustment needed) |
| 静止電流 | 15mA (typical, no-load condition); 0.5mA (shutdown mode) |
| 出力リップル | ??50mV頁 (typical, 5V output, 2A load) |
| 統合された保護機能 | Overcurrent protection (6A typical), thermal shutdown (160??C typical), short-circuit protection, under-voltage lockout |
| コンプライアンス | AEC-Q100 Grade 1, RoHS 2 compliant, ISO 9001 certified |
Key Technical Features of L5970ADTR Step-Down Regulator
- Wide 4.5V?C40V input range, compatible with 12V/24V industrial power supplies and 12V automotive batteries. An automotive engineer reported: ??This range handles voltage spikes up to 40V (common in vehicle electrical systems) without shutting down-our old regulator failed at 35V, causing infotainment glitches.??
- 3A continuous output current, powering high-load industrial components like motor drivers. An industrial tech firm shared: ??We use it to power 24V PLC motor modules-its 3A capacity eliminates the need for a separate current booster, cutting component count by 40%.??
- TO252 package with 35??C/W thermal resistance, 2x better than SOT223 (70??C/W). A factory automation designer noted: ??In 50??C factories, this package keeps the regulator at 85??C-SOT223 units hit 110??C, triggering thermal shutdown and production delays.??
- 92% peak efficiency, minimizing energy loss in high-power applications. An appliance manufacturer confirmed: ??Our old regulator wasted 0.8W at 2A load-this one wastes just 0.07W. For 100,000 refrigerators, that??s 73,000W daily energy savings.??
- AEC-Q100 Grade 1 certification, ensuring reliability in automotive temperature swings (-40??C to +150??C). A vehicle electronics firm explained: ??It works flawlessly in winter (-30??C) and summer (+45??C) conditions-our old non-certified regulator had a 15% failure rate in extreme temps.??
Advantages of L5970ADTR vs. Typical Alternative Regulators
Compared to low-current step-down regulators, non-automotive-grade ICs, and low-efficiency linear regulators, the L5970ADTR delivers three critical benefits for B2B industrial and automotive designs-backed by real customer feedback:
First, its 3A current capacity outperforms low-current regulators. Most basic step-down ICs max out at 1A, requiring external current boosters for high-load components like industrial motor drivers. The L5970ADTR??s 3A capacity eliminates this. An industrial automation firm explained: ??Our old 1A regulator needed a booster to power 2A motor modules-adding 2 extra components and 30% PCB space. This regulator handles it alone, shrinking our PLC??s PCB by 25% and cutting assembly time by 20%.??
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Second, its AEC-Q100 Grade 1 certification outperforms non-automotive regulators. Non-certified ICs fail in extreme automotive temps (-40??C to +150??C), causing system glitches. The L5970ADTR??s certification fixes this. An automotive electronics maker confirmed: ??Our old non-certified regulator had a 12% failure rate in cold winters (-30??C)-this one has 0% failures. We??ve reduced warranty claims by 40% and improved customer satisfaction scores by 25%.??
Third, its 92% efficiency outperforms linear regulators. Linear regulators for 5V outputs (from 12V input) max at 42% efficiency, wasting 58% energy as heat. The L5970ADTR??s synchronous design cuts this loss to 8%. A home appliance brand shared: ??Our old linear regulator for refrigerators wasted 1.1W at 2A load-this regulator wastes just 0.09W. For 500,000 units, that??s 505,000W daily energy savings, and we??ve reduced heat-related component failures by 35%.??
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Typical Applications of STMicroelectronics L5970ADTR
The L5970ADTR excels in rugged, high-power designs-with proven success in these key B2B use cases:
- Industrial Automation (PLC Modules): Regulating 24V factory power to 5V (microcontroller) and 12V (motor driver). An industrial firm confirmed: ??3A current handles motor loads, TO252 package prevents overheating-PLC reliability improved to 99.9% from 99.2%.??
- Automotive Electronics (Infotainment Systems): Converting 12V battery power to 3.3V (MCU) and 5V (display). An auto brand reported: ??AEC-Q100 certification works in extreme temps, 92% efficiency cuts power use-infotainment failure rates dropped by 30%.??
- Home Appliances (High-Power Refrigerators): Powering 12V compressor controllers from 230V AC-DC adapters. An appliance firm noted: ??3A current handles compressor spikes, low ripple ensures stable cooling-refrigerator energy use reduced by 8%.??
- 産業オートメーション（モータードライブ）: Regulating 40V industrial power to 24V (motor) and 5V (control circuit). A factory tech firm shared: ??Wide input range handles power fluctuations, thermal protection prevents shutdown-motor drive uptime improved to 99.8%.??
- Automotive Electronics (Sensor Modules): Converting 12V battery power to 5V (GPS sensor) and 3.3V (temperature sensor). A vehicle parts maker confirmed: ??Overcurrent protection prevents sensor damage, high accuracy ensures reliable data-sensor error rates dropped by 95%.??
Frequently Asked Questions (FAQ) About L5970ADTR
Why is AEC-Q100 Grade 1 certification important for automotive electronics?
Automotive electronics face extreme temperatures (-40??C to +150??C) and voltage spikes-non-certified regulators fail in these conditions, causing infotainment glitches or sensor errors. AEC-Q100 Grade 1 ensures the L5970ADTR works reliably here. An auto engineer noted: ??Our old non-certified regulator failed 12% of the time in -30??C winters-this certified model has 0% failures. It??s reduced warranty costs by $200,000 annually and kept customers happy.??
Can the L5970ADTR handle 24V industrial power supplies?
Yes. Its 4.5V?C40V input range is optimized for 24V industrial power systems (common in factories) and maintains stable output even during power fluctuations (up to 40V). An industrial tech designer confirmed: ??Our factory??s 24V power sometimes spikes to 36V-this regulator handles it without shutting down. Our old 30V-max regulator failed 8% of the time during spikes, but this one has 0% failures, keeping production lines running.??
What value does the TO252 package add for industrial applications?
Industrial applications often run in high-temperature environments (50??C+), so regulators need good thermal dissipation to avoid overheating. The TO252 package??s 35??C/W thermal resistance is 2x better than SOT223 (70??C/W). A PLC maker shared: ??In 50??C factories, our old SOT223 regulator hit 110??C and shut down-this TO252 model stays at 85??C. We??ve cut production downtime from 2 hours/week to 0, boosting productivity by 5%.??
Why is 3A continuous current capacity critical for motor drives?
Industrial motor drives need steady high current (2A?C3A) to power motors-low-current regulators (1A max) require external boosters, adding cost and space. The L5970ADTR??s 3A capacity eliminates this. An automation engineer noted: ??Our old 1A regulator needed a booster for 2A motors-adding $0.50 per unit and 30% PCB space. This regulator handles it alone, cutting per-unit cost by $0.40 and shrinking our motor drive??s size by 25%.??
How does high efficiency benefit home appliances like refrigerators?
Home appliances run 24/7, so low efficiency wastes energy and generates heat (causing component failures). The L5970ADTR??s 92% efficiency cuts energy use and heat. A refrigerator brand confirmed: ??Our old 42% efficient regulator wasted 1.1W-this 92% model wastes 0.09W. For 500,000 units, that??s 505,000W daily savings, and heat-related compressor failures dropped by 35%-saving $150,000 in warranty costs.??
