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STMicroelectronics STCF02PNR
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- Part No.:
- STCF02PNR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
STCF02PNR.pdf
- Description:
- IC LED DRIVER RGLTR 600MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,269
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Product details
Overview
STCF02PNR from STMicroelectronics is a buck-boost DC/DC LED driver IC designed to power a single high-brightness white LED in portable camera flash applications. It delivers up to 600 mA flash current (2.7–4.5 V input), features 1.8 MHz fixed-frequency PWM, synchronous rectification, and integrated LED short/open/overvoltage/thermal protection. Its QFN20 4 mm × 4 mm package supports compact smartphone front-end designs.
For engineers reviewing the STCF02PNR datasheet, STCF02PNR pinout, STCF02PNR application, or STCF02PNR equivalent, key selection criteria include adjustable multi-mode current control (flash/torch/medium flash), NTC-based LED temperature monitoring, shutdown current <1 µA, and buck-boost topology enabling stable LED drive across Li-ion battery voltage sag (2.7–4.5 V).
Technical Context
The STCF02PNR implements a constant-frequency (1.8 MHz typ) buck-boost converter with dual feedback paths: FB2 regulates flash current via RFLASH (160 mV reference), while FB1 regulates torch current via RTORCH+RFLASH. Mode selection is controlled by three digital enable inputs (EN1/EN2/EN3), supporting five distinct operational states including safety-shutdown-enabled flash mode.
It integrates analog protection circuitry including overvoltage protection (5.2 V threshold), thermal shutdown (140 °C trip, 20 °C hysteresis), and programmable flash timeout via RX-connected RC network. LED temperature sensing uses an external NTC resistor connected to the NTC pin, with internal 1.192 V reference and 0.3 V hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Topology | Buck-boost DC/DC converter - enables stable LED current regulation even when battery voltage drops below LED forward voltage (e.g., 3.2 V battery driving 3.6 V LED). |
| Max Flash Current | 600 mA - set by RFLASH = 0.27 Ω; supports high-intensity camera strobes without external current amplification. |
| Torch Current Range | 25–250 mA - adjustable via RTORCH; provides continuous illumination for video recording or UI backlighting. |
| Switching Frequency | 1.8 MHz (typ) - allows use of small external inductors (e.g., 4.7 µH) and ceramic capacitors, minimizing PCB footprint. |
| Quiescent Current | <1 µA in shutdown - preserves battery life during standby in mobile devices with infrequent flash usage. |
| Protection Features | LED open/short, overvoltage (5.2 V), thermal shutdown (140 °C), and programmable flash timeout - eliminates need for discrete protection circuitry. |
| Efficiency | 78–85% at 600 mA (3.2–4.2 V input) - reduces thermal load on PCB and extends battery runtime per flash event. |
Pinout & Package
STCF02PNR is housed in a thermally enhanced QFN20 (4 mm × 4 mm, 0.9 mm height) package with exposed PGND pad for optimal thermal dissipation and low-inductance power grounding. Pin numbering follows bottom-view layout with dual VLX1 terminals (pins 14 & 15) paralleled for high-current inductor connection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VLX1A / VLX1B (14,15) | High-side inductor switch node | Parallel connection required; carries peak inductor current up to 2.3 A - must be routed with minimal trace length/inductance. |
| VLX2 (1) | Low-side inductor switch node | Completes buck-boost power stage; connects to same inductor as VLX1A/B - forms critical high-di/dt loop. |
| VO (3) | LED anode output | Regulated output node; connects directly to LED anode - requires low-ESR ceramic capacitor (4.7 µF) to ground. |
| FB1 (5) | Torch current sense input | Senses voltage across RTORCH+RFLASH; 160 mV reference sets torch current - determines accuracy of low-power illumination mode. |
| FB2 (7) | Flash current sense input | Senses voltage across RFLASH only; 160 mV reference sets flash current - enables precise high-current control independent of torch path. |
| NTC (4) | LED temperature sensor interface | Accepts external NTC thermistor (e.g., 100 kΩ @ 25 °C); enables dynamic current derating to prevent LED thermal damage. |
| EN1/EN2/EN3 (16,17,20) | Digital mode select inputs | Three-level logic controls five operating modes (shutdown, torch, flash, medium flash, NTC-active shutdown) - no external decoding logic needed. |
| PGND (18, Exp-pad) | Power ground return | Exposed thermal pad + pin 18 - must be soldered to large PCB ground plane for thermal management and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-mode LED current control | Independent adjustment of flash (100–600 mA), torch (25–250 mA), and medium flash (25–100% of flash) via external resistors - eliminates firmware-based current scaling. |
| Integrated LED protection | Dual-path fault detection (open/short LED) with automatic shutdown - prevents battery drain and system instability during LED failure. |
| Programmable flash safety timeout | RC network on RX pin sets maximum flash duration (e.g., 200 ms) - mitigates microcontroller lockup-induced LED burnout. |
| Synchronous rectification | Internal MOSFET replaces external Schottky diode - improves efficiency by ~8% vs. asynchronous design and reduces thermal stress. |
| Soft-start control | Gradual ramp-up of LED current limits inrush current to <6 ms rise time - avoids battery voltage droop affecting RF/baseband subsystems. |
Applications
| Smartphone Camera Flash | Digital Still Camera Strobe |
|---|---|
|
Use Scenario: High-intensity illumination for low-light photography in compact smartphones with space-constrained front camera modules. IC Role / Device Role / Timing Role: Buck-boost LED driver providing regulated 600 mA flash current synchronized to image capture trigger with sub-30 µs transition from flash to torch mode. Use Value: Enables consistent color rendering and exposure control despite Li-ion battery voltage decay from 4.2 V to 3.2 V during discharge cycle. |
Use Scenario: Burst-mode flash operation in portable digital cameras requiring rapid sequential illumination without thermal throttling. IC Role / Device Role / Timing Role: Multi-mode current controller delivering programmable flash (600 mA), medium flash (300 mA), and torch (100 mA) via hardware-selectable EN pins. Use Value: Eliminates need for external current DACs or microcontroller intervention, reducing BOM count and firmware complexity. |
| PDA Imaging Module | Industrial Barcode Scanner Illumination |
|
Use Scenario: Flash-assisted autofocus and document capture in legacy PDAs with limited PCB area and thermal budget. IC Role / Device Role / Timing Role: Integrated protection-enabled LED driver supplying 250 mA torch current for video preview and 600 mA flash for still capture. Use Value: Single-chip solution replaces discrete boost converter + current sink + thermal monitor - cuts board area by >40%. |
Use Scenario: High-reliability LED illumination in ruggedized handheld scanners operating in wide ambient temperatures (-20 °C to 70 °C). IC Role / Device Role / Timing Role: Temperature-aware LED controller using NTC input to dynamically reduce flash current above 60 °C ambient. Use Value: Prevents LED lumen depreciation and catastrophic failure in unventilated enclosures without adding thermal sensors or software logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61310DSKR | Boost-only topology; no buck capability; 4.5 A switch current limit; 2.5 MHz switching frequency. | Limited to LED Vf < battery voltage; cannot regulate flash current when battery sags below 3.4 V - unsuitable for full Li-ion range. | Select only if system uses regulated 3.6 V supply and requires higher peak current (4.5 A) than STCF02PNR's 2.3 A. |
| MAX8630YETA+ | Fixed 200 mA torch / 1 A flash; no adjustable medium flash mode; no NTC interface; 1.25 MHz switching. | Hardware-programmed current levels only; lacks thermal derating and safety timeout - requires external thermal management. | Choose for cost-sensitive designs where fixed current levels and absence of temperature monitoring are acceptable. |
Compared with TPS61310DSKR and MAX8630YETA+, STCF02PNR uniquely combines buck-boost operation, NTC-based thermal protection, and three independently adjustable current modes in a single QFN20 package - making it the only option for battery-voltage-agnostic flash systems requiring field-programmable safety features.
Availability
STCF02PNR is available at Aetrix Electronics and suitable for smartphone camera modules, digital still camera strobes, PDA imaging subsystems, and industrial barcode scanner illumination requiring stable component supply across extended production lifecycles.
Supply support for STCF02PNR 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, specializing in power management, analog, and automotive-grade ICs with broad industrial and consumer reach.
The STCF02PNR belongs to ST's high-efficiency LED driver product line, engineered specifically for space-constrained mobile imaging applications demanding robust protection, multi-mode flexibility, and Li-ion battery compatibility.
FAQ
What is the minimum input voltage required for STCF02PNR to deliver 600 mA flash current?
The STCF02PNR maintains 600 mA flash output down to 2.7 V input, as confirmed in Table 5 (IO specification: "Flash mode for VI = 2.7V to 4.5V"). Below 2.7 V, under-voltage lockout activates at 5.1–5.3 V (rising edge), but actual functional lower limit is defined by the buck-boost topology's ability to sustain regulation - verified to 2.7 V in typical characteristics Figure 6.
How does the STCF02PNR implement LED temperature protection without an integrated sensor?
It uses an external NTC thermistor connected between the NTC pin and ground, biased by an internal 1.192 V reference. The device monitors the resulting voltage divider output and triggers shutdown when temperature exceeds the threshold set by RX resistor value - detailed in Section 6.11 and Figure 14 of the datasheet.
Can STCF02PNR operate in boost-only mode, and what is the maximum output voltage?
Yes - the buck-boost architecture automatically selects boost mode when VO > VBAT (e.g., driving a 3.6 V LED from a 3.2 V battery). Maximum regulated output voltage is 5.1 V (Table 5, VO Regulated voltage range), sufficient for most white LEDs with forward voltages up to 4.5 V plus sensing resistor drop.
What is the purpose of the RTBY pin, and how does it affect torch mode operation?
RTBY is a MOS switch that shorts RTORCH during flash and medium flash modes, isolating the torch current sense path. In torch mode, RTBY is open, allowing FB1 to sense voltage across both RFLASH and RTORCH - enabling independent current programming without interference from flash-mode components.
STCF02PNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2.5V ~ 5.1V
- Current - Output / Channel:
- 600mA (Flash)
- Frequency:
- 1.8MHz
- Dimming:
- -
- Applications:
- Camera Flash
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (4x4)
STCF02PNR FAQ
1.How can I place an order for STCF02PNR through Aetrix?
Please submit a Request for Quotation (RFQ) for STCF02PNR 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 STCF02PNR reliable?
The price and inventory of STCF02PNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STCF02PNR is usually 5 days.
3.What payment methods are accepted for STCF02PNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STCF02PNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STCF02PNR?
STCF02PNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STCF02PNR 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 STCF02PNR?
For technical support, including STCF02PNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STCF02PNR requirements.
6.How does Aetrix verify that STCF02PNR is sourced from the original manufacturer or authorized distributors?
All STCF02PNR 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 STCF02PNR meets industry standards.
7.What is the process for return or replacement of STCF02PNR?
All STCF02PNR units undergo pre-shipment inspection (PSI). If there is an issue with STCF02PNR, 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 STCF02PNR part is unused and in its original packaging.
Return procedure for STCF02PNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STCF02PNR Tags
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