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STMicroelectronics STCS2ASPR
- Part No.:
- STCS2ASPR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- PowerSO-10 Exposed Bottom Pad
- Datasheet:
-
STCS2ASPR.pdf
- Description:
- IC LED DRVR LIN PWM 2A 10POWERSO
- Quantity:
- Payment:
- Shipping:
Inventory:4,921
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Product details
Overview
STCS2ASPR from STMicroelectronics is a BiCMOS constant-current LED driver IC with integrated N-MOSFET, designed for precise current regulation in low-voltage LED lighting systems. It delivers up to 2 A output current with ±10% accuracy, <0.5 V dropout voltage at full load, and supports PWM dimming and open-load diagnostics. Used in automotive LED lamps and 12 V/24 V appliance lighting.
For engineers reviewing the STCS2ASPR datasheet, STCS2ASPR pinout, STCS2ASPR application, or STCS2ASPR equivalent, key selection criteria include its 40 V input capability, 100 mV feedback reference, slope-controlled current rise/fall, DISC open-drain diagnostic flag, and PowerSO-10 thermal performance with RthJA as low as 12 °C/W.
Technical Context
The STCS2ASPR integrates a high-side N-MOSFET current sink with internal 100 mV precision feedback comparator and dedicated slope control via external capacitor on the SLOPE pin. Its architecture enables fast (<4 µs) current switching when CSLOPE is floating, or programmable rise/fall times (800 µs to milliseconds) using CSLOPE = 1–10 nF.
It features dual-level protection: thermal shutdown at 155 °C with 25 °C hysteresis, and LED disconnection detection via DRAIN-to-GND voltage monitoring (75 mV turn-on threshold). The EN pin provides sub-1 µA shutdown current, while PWM input accepts logic-level signals (VH = 1.2 V, VL = 0.4 V) up to 50 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | Up to 2 A, set by external FB resistor with ±10% tolerance at TJ = –40 to +125 °C. |
| Input voltage range | 4.5 V to 40 V DC - supports wide-range industrial and automotive supply rails. |
| Dropout voltage | 0.58 V typical at 2 A - enables operation with minimal headroom over LED string VF. |
| Feedback reference | 100 mV ±10 mV - allows low-value, low-power sense resistors (e.g., 50 mΩ for 2 A). |
| PWM dimming frequency | DC to 50 kHz - supports flicker-free dimming with controlled current slew rate. |
| Diagnostic output | Open-drain DISC pin pulled low when DRAIN–GND < 75 mV - indicates LED open-circuit fault. |
| Thermal shutdown | 155 °C junction temperature with 25 °C hysteresis - prevents permanent device damage under overload. |
Pinout & Package
STCS2ASPR is housed in a PowerSO-10 surface-mount package with exposed thermal pad, optimized for PCB heat dissipation (RthJA down to 12 °C/W with copper-filled vias and external heatsink).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply input | 4.5–40 V DC power rail connection; powers internal bias and gate drivers. |
| PWM | Digital dimming control | Logic-level input (0.4 V / 1.2 V thresholds) enabling/disabling output current per duty cycle. |
| EN | Enable/disable control | Active-high shutdown; pulls quiescent current to <1 µA when low. |
| NC | No connect | Pin 4 is internally unconnected - must be left floating or tied to GND per layout guidelines. |
| DRAIN | N-MOSFET drain | High-side current sink output; connects to LED anode or cathode depending on topology. |
| SOURCE | N-MOSFET source | Reference node for current sensing; 100 mV drop across RFB sets output current magnitude. |
| FB | Feedback input | Monitors voltage across RFB; internal op-amp regulates DRAIN–SOURCE to maintain 100 mV. |
| GND | Ground reference | Common return for VCC, PWM, EN, FB, SLOPE, DISC, and SOURCE connections. |
| SLOPE | Slew-rate control | Accepts external capacitor (1–10 nF) to linearly adjust current rise/fall time from ~800 µs to ms range. |
| DISC | Fault indicator | Open-drain output pulled low during LED disconnection; requires external pull-up for system-level alert. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated N-MOSFET current sink | Eliminates external high-side switch and reduces BOM count in LED string drivers. |
| Programmable current slew rate | External CSLOPE capacitor enables EMI reduction and eliminates turn-on current overshoot. |
| LED open-circuit detection | DISC pin asserts fault within microseconds when DRAIN–GND drops below 75 mV. |
| Low dropout operation | 0.16 V typical at 100 mA and 0.9 V max at 2 A - maximizes usable input voltage range. |
| Wide input voltage support | 4.5–40 V operation accommodates 5 V USB-powered, 12 V automotive, and 24 V industrial rails. |
Applications
| Automotive LED Headlamp Modules | Industrial Control Panel Lighting |
|---|---|
Use Scenario: Driving high-brightness white LED arrays in 12 V vehicle lighting systems with strict EMI limits. IC Role / Device Role / Timing Role: Constant-current sink regulating 1–2 A through series-connected LEDs while rejecting battery voltage ripple. Use Value: Slope control via CSLOPE capacitor suppresses conducted EMI during PWM dimming, meeting CISPR 25 Class 3 requirements. | Use Scenario: Providing stable backlighting for membrane switches and status indicators in factory HMIs operating from 24 V DC supplies. IC Role / Device Role / Timing Role: High-precision current source maintaining consistent luminance across varying ambient temperatures. Use Value: ±10% current accuracy and 100 mV FB reference ensure uniform LED brightness without recalibration over –40 to +85 °C. |
| Smart Home Appliance Indicator Lights | Commercial Refrigeration Display Backlighting |
Use Scenario: Dimmable status LEDs in washing machines and ovens powered from internal 5 V or 12 V SMPS rails. IC Role / Device Role / Timing Role: PWM-controlled current regulator interfacing directly with microcontroller GPIO pins. Use Value: Logic-compatible EN and PWM inputs (VH = 1.2 V) allow direct drive from 3.3 V MCUs without level-shifting. | Use Scenario: Driving parallel LED strings in refrigerated display cases where thermal management is constrained. IC Role / Device Role / Timing Role: Thermally robust current sink mounted on copper-poured PCB areas with thermal vias. Use Value: PowerSO-10 package with RthJA = 12 °C/W enables 2 A operation at TA = 50 °C without external heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Switching buck LED driver (not linear); higher efficiency (>90%) but requires inductor and diode. | Preferred for >10 W LED loads where thermal budget is tight; unsuitable for ultra-low-noise or EMI-sensitive environments. | Select AL8862SP-13 when input voltage exceeds 40 V or efficiency >85% is mandatory; STCS2ASPR remains optimal for simplicity, low noise, and <2 A linear regulation. |
| LM3407MMX/NOPB | Linear LED driver with 1.23 V FB reference and no integrated MOSFET - requires external P-MOSFET. | Offers adjustable current limit via external FET but increases component count and layout complexity. | Choose LM3407MMX/NOPB only if design requires high-side sourcing topology or >2 A with discrete FET derating; STCS2ASPR provides lower BOM cost and smaller footprint. |
Compared with AL8862SP-13 and LM3407MMX/NOPB, STCS2ASPR uniquely combines integrated N-MOSFET, 100 mV FB reference, and slope-controlled slew rate in a single PowerSO-10 package - delivering lowest system-level EMI, smallest PCB area, and fastest time-to-light for <2 A LED loads.
Availability
STCS2ASPR is available at Aetrix Electronics and suitable for automotive LED lighting, industrial HMI backlighting, and smart appliance indicator applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for STCS2ASPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
The STCS2A product line targets cost-sensitive, thermally constrained LED lighting designs where integration, precision, and diagnostic capability outweigh switching efficiency - especially in 5–24 V systems with stringent EMI or layout space limitations.
FAQ
What is the minimum input voltage required for STCS2ASPR to regulate 2 A?
The STCS2ASPR requires a minimum input voltage of 4.5 V to operate, but to sustain 2 A output, the input must exceed the sum of LED forward voltage plus dropout voltage (VDROP ≤ 0.9 V). For example, with three 3.6 V LEDs (10.8 V VF), minimum VIN = 10.8 V + 0.9 V = 11.7 V.
Can STCS2ASPR drive multiple parallel LED strings?
No - STCS2ASPR is a single-channel constant-current sink and must drive one LED string per device. Parallel strings require individual STCS2ASPR units or external current-matching components, as mismatched VF causes unequal current sharing and potential thermal runaway.
How does the SLOPE pin affect PWM dimming performance?
The SLOPE pin controls current slew rate: with CSLOPE = 10 nF, rise/fall time is ~800 µs, reducing EMI and eliminating overshoot; with CSLOPE floating, rise/fall time drops to ~4 µs, enabling faster dimming but increasing high-frequency noise and risk of current spike at turn-on.
Is STCS2ASPR qualified for automotive applications?
STCS2ASPR is not AEC-Q100 qualified and is specified for industrial temperature range (–40 to +125 °C), but it is widely used in non-safety-critical automotive lighting (e.g., interior lamps, license plate lights) where customers perform their own qualification. ST does not guarantee automotive-grade reliability or PPAP documentation.
STCS2ASPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- PowerSO-10 Exposed Bottom Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 2A
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-PowerSO
STCS2ASPR FAQ
1.How can I place an order for STCS2ASPR through Aetrix?
Please submit a Request for Quotation (RFQ) for STCS2ASPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STCS2ASPR reliable?
The price and inventory of STCS2ASPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STCS2ASPR is usually 5 days.
3.What payment methods are accepted for STCS2ASPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STCS2ASPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STCS2ASPR?
STCS2ASPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STCS2ASPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STCS2ASPR?
For technical support, including STCS2ASPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STCS2ASPR requirements.
6.How does Aetrix verify that STCS2ASPR is sourced from the original manufacturer or authorized distributors?
All STCS2ASPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STCS2ASPR meets industry standards.
7.What is the process for return or replacement of STCS2ASPR?
All STCS2ASPR units undergo pre-shipment inspection (PSI). If there is an issue with STCS2ASPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STCS2ASPR part is unused and in its original packaging.
Return procedure for STCS2ASPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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