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STMicroelectronics STLDC08PUR
- Part No.:
- STLDC08PUR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 10-VFDFN Exposed Pad
- Datasheet:
-
STLDC08PUR.pdf
- Description:
- IC LED DRIVER CTRLR PWM 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:588
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Product details
Overview
STLDC08PUR from STMicroelectronics is a hysteretic step-up LED controller optimized for single/dual-cell alkaline/NiMH/NiCd battery operation (0.8–3.6 V input), driving external N-channel MOSFETs to regulate LED current via SENSE resistor feedback, with integrated 5 V LDO (V5), charge pump (2VCC), and precision PWM dimming driver (PWMOUT), used in portable lighting and small-appliance LED systems.
For engineers reviewing the STLDC08PUR datasheet, STLDC08PUR pinout, STLDC08PUR application, or STLDC08PUR equivalent, this device is selected for low-voltage boost LED drivers requiring no loop compensation, overvoltage protection (19.5 V trip), precise PWM dimming control, and operation down to 0.8 V supply - critical for battery-powered handheld equipment.
Technical Context
The STLDC08PUR implements constant-off-time (TONMAX = 20 µs, TOFF = 1 µs) hysteretic current-mode control, eliminating need for external compensation components. Its peak-current sensing via SENSE pin (100 mV threshold) directly regulates LED current using an external RFB resistor tied to FB (105 mV typ reference).
It integrates dual power paths: VCC powers startup and charge pump; once VOUT exceeds 1.9 V, supply shifts to VOUT, disabling the charge pump. The 5 V LDO (V5) delivers up to 10 mA with ±2% regulation, while PWMOUT and DRV outputs drive external MOSFETs with 30 ns rise/fall times and rail-to-rail swing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 0.8 V to 3.6 V - supports direct operation from 1–2 alkaline/NiMH cells without pre-regulation. |
| Feedback Reference Voltage | 105 mV (typ) at FB pin - sets LED current via external RFB; ±10% tolerance enables ±10% LED current accuracy with 1% resistor. |
| OVP Threshold | 19.5 V (typ) - protects external MOSFET and output capacitor when LEDs are disconnected or open-circuit. |
| Constant Off-Time | 1 µs - defines minimum switching period; enables stable hysteretic control without compensation network. |
| V5 LDO Output | 5.0 V ±2% at 10 mA - powers auxiliary circuitry (e.g., microcontroller I/O, sensors) with low dropout (20 mV). |
| PWMOUT Drive Strength | ±100 mA sink/source - directly drives gate of small-signal N-MOSFET for flicker-free dimming at >120 Hz. |
| DRV Output Rise/Fall | 30 ns / 20 ns (with 3300 pF load) - ensures fast MOSFET turn-on/off, minimizing switching losses in boost stage. |
Pinout & Package
STLDC08PUR is housed in a thermally enhanced DFN10 (3 × 3 mm, 0.5 mm pitch) package with exposed pad soldered to analog ground for optimal thermal dissipation (RthJA = 57.1 °C/W on 2-layer PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VOUT | OVP sense & secondary supply | Detects output overvoltage; supplies IC when VOUT > 2 V, enabling automatic supply switchover from VCC. |
| 2 PWMOUT | Dimming MOSFET driver | Drives gate of external N-MOSFET for precise PWM dimming; synchronized with EN/PWM input to avoid LED current spikes. |
| 3 2VCC | Charge pump output | Boosts internal voltage during startup; active only until VOUT > 1.9 V, then disabled to reduce quiescent current. |
| 4 VCC | Primary supply input | Accepts 0.8–3.6 V battery input; powers IC and charge pump before VOUT takeover. |
| 5 FB | Current sense feedback | Compares voltage across RFB to 105 mV reference; sets average LED current (ILED = 0.1 V / RFB). |
| 6 SENSE | Peak current limit input | Monitors voltage across sense resistor or MOSFET RDS(ON); trips at 100 mV to limit inductor peak current. |
| 7 EN/PWM | Enable & dimming control | Active-high enable; accepts 0.4–1.2 V logic thresholds; PWM duty cycle directly controls LED brightness. |
| 8 GND | Analog/digital ground | Common return for all signals; exposed pad must be connected to GND plane for thermal and noise performance. |
| 9 DRV | Boost MOSFET driver | High-current gate driver for main N-MOSFET; 80–160 mV low-level voltage ensures full turn-off under load. |
| 10 V5 | Integrated 5 V LDO output | Stable 5 V supply for external circuitry; requires ≥1 µF ceramic decoupling to GND for regulation integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Hysteretic current-mode control | Eliminates need for external compensation components, simplifying BOM and layout for portable designs. |
| Auto-supply switchover (VCC → VOUT) | Reduces system quiescent current by >90% after startup, extending battery life in always-on lighting applications. |
| Integrated 5 V LDO (V5) | Provides regulated auxiliary power without external regulator, enabling single-supply system architecture. |
| Synchronized PWM dimming | Prevents LED current spikes during PWM transitions by coordinating DRV and PWMOUT timing, ensuring LED reliability. |
| Overvoltage protection (OVP) | Hardware-level 19.5 V shutdown prevents damage to external MOSFET and output capacitors during open-LED fault. |
Applications
| Portable Flashlights | USB-Powered LED Lamps |
|---|---|
|
Use Scenario: Handheld LED flashlight powered by two AA alkaline cells (1.2–3.2 V range) with adjustable brightness. IC Role / Device Role / Timing Role: Step-up controller regulating constant LED current (200–300 mA) via SENSE resistor; PWMOUT drives dimming FET; DRV switches main boost MOSFET. Use Value: Enables >90% efficiency across battery discharge curve while maintaining stable LED brightness without flicker. |
Use Scenario: Compact desk lamp powered via USB 5 V input with buck-boost conversion to drive 2–4 white LEDs in series. IC Role / Device Role / Timing Role: Functions as standalone boost controller; V5 powers USB interface logic; EN/PWM accepts microcontroller dimming commands. Use Value: Eliminates need for separate 5 V regulator and dimming driver IC, reducing board area and BoM count by 2–3 components. |
| Medical Diagnostic Lights | Smart Home Sensor Indicators |
|
Use Scenario: Battery-operated otoscope or dermatoscope requiring consistent LED intensity for accurate tissue visualization. IC Role / Device Role / Timing Role: Provides tightly regulated LED current (±10% via 1% RFB) with OVP safeguarding against accidental open-circuit during probe detachment. Use Value: Ensures clinical-grade light stability and safety compliance without complex feedback loop tuning. |
Use Scenario: Low-power IoT sensor node with status LED indication, powered by coin cell (1.5 V) and requiring ultra-low shutdown current. IC Role / Device Role / Timing Role: Operates in shutdown mode drawing only 5–10 µA; wakes instantly on EN/PWM high; V5 powers BLE radio during brief transmission bursts. Use Value: Extends 2032 coin cell life to >2 years in intermittent-use applications with zero external biasing circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61061DRVR | Fixed 500 kHz frequency, integrated switch (no external MOSFET), lower max input (6 V), no V5 LDO. | Better for space-constrained designs with <1 W output; unsuitable for >300 mA or battery voltage <1 V. | Select when board area is critical and external MOSFET drive is unnecessary; avoid for sub-1 V NiMH or high-current portable lighting. |
| LT3466EDD | Current-mode PWM (not hysteretic), requires compensation, higher quiescent current (60 µA), no integrated V5 LDO. | Offers tighter current regulation (±2%) but adds 4–5 passive components; needs external 5 V rail. | Choose for precision medical lighting where regulation accuracy outweighs BOM complexity and battery life impact. |
Compared with TPS61061DRVR and LT3466EDD, STLDC08PUR uniquely combines ultra-low input (0.8 V), no-compensation hysteretic control, integrated 5 V LDO, and hardware OVP - making it optimal for cost-sensitive, battery-limited portable LED systems demanding simplicity and robustness.
Availability
STLDC08PUR is available at Aetrix Electronics and suitable for portable flashlights, medical diagnostic lights, USB-powered LED lamps, and smart home sensor indicators requiring stable component supply across extended production cycles.
Supply support for STLDC08PUR 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 automotive, industrial, and consumer markets.
The STLDC08PUR belongs to ST's LED lighting controller product line, engineered specifically for low-input-voltage, high-efficiency boost architectures in battery-powered portable equipment - prioritizing minimal external components and robust fault protection.
FAQ
What is the minimum input voltage required for STLDC08PUR startup?
The STLDC08PUR starts up reliably at 0.8 V on the VCC pin, verified per datasheet absolute maximum ratings and startup timing diagrams. At this voltage, the internal charge pump activates, bringing 2VCC to 1.7 V to initiate soft-start. Operation remains stable down to 0.8 V across temperature (−40 °C to 85 °C), enabling use with deeply discharged NiMH cells.
How does STLDC08PUR achieve PWM dimming without LED current spikes?
STLDC08PUR synchronizes PWMOUT and DRV timing: when EN/PWM goes low, it immediately disables DRV to halt boost current, allowing coil energy to dissipate safely through the LED branch before PWMOUT turns off. This sequence - confirmed in Figure 17 timing diagram and Section 7.5 - prevents destructive current transients during dimming transitions.
Can STLDC08PUR drive more than 4 LEDs in series?
No - the 19.5 V OVP threshold and typical 3.2–3.6 V forward voltage per white LED limit practical configuration to ≤5 LEDs (max ~18 V), but datasheet application schematics and efficiency curves (Figures 8–9) validate only 2-LED (200 mA) and 4-LED (300 mA) topologies. Driving 5+ LEDs risks OVP triggering under load transients or temperature drift.
Is an external Schottky diode mandatory for STLDC08PUR operation?
Yes - the STLDC08PUR is a controller-only IC with no integrated power switch or diode. Section 8.6 explicitly specifies Schottky diode selection (e.g., STPS2L30) for the boost rectifier path. Its low forward voltage (<0.4 V) and fast recovery minimize conduction loss and ensure stable operation at high switching frequencies inherent to hysteretic control.
STLDC08PUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 10-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 0.8V
- Voltage - Supply (Max):
- 3.6V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-DFN (3x3)
STLDC08PUR FAQ
1.How can I place an order for STLDC08PUR through Aetrix?
Please submit a Request for Quotation (RFQ) for STLDC08PUR 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 STLDC08PUR reliable?
The price and inventory of STLDC08PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLDC08PUR is usually 5 days.
3.What payment methods are accepted for STLDC08PUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLDC08PUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STLDC08PUR?
STLDC08PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STLDC08PUR 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 STLDC08PUR?
For technical support, including STLDC08PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLDC08PUR requirements.
6.How does Aetrix verify that STLDC08PUR is sourced from the original manufacturer or authorized distributors?
All STLDC08PUR 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 STLDC08PUR meets industry standards.
7.What is the process for return or replacement of STLDC08PUR?
All STLDC08PUR units undergo pre-shipment inspection (PSI). If there is an issue with STLDC08PUR, 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 STLDC08PUR part is unused and in its original packaging.
Return procedure for STLDC08PUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STLDC08PUR Tags
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BCR420UE6433HTMA1
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