My Inquiry
My Account
STMicroelectronics ST1CC40PUR
- Part No.:
- ST1CC40PUR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 8-VQFN Exposed Pad
- Datasheet:
-
ST1CC40PUR.pdf
- Description:
- IC LED DRIVER RGLTR 3A 8VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:26,798
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ST1CC40PUR from STMicroelectronics is a monolithic 3 A synchronous step-down constant-current LED driver IC with fixed 850 kHz switching frequency, ±7% output current accuracy, and 100 mV typical current-sense voltage drop. It operates from 3.0 V to 18 V input, integrates high-side (95 mΩ) and low-side (69 mΩ) MOSFETs, and delivers precise DC current for high-brightness LED strings in signage and emergency lighting.
For engineers reviewing the ST1CC40PUR datasheet, ST1CC40PUR pinout, ST1CC40PUR application, or ST1CC40PUR equivalent, this device is selected for its embedded compensation, thermal shutdown, hiccup-mode overcurrent protection, and ceramic-capacitor compatibility - critical for compact, thermally constrained LED driver designs.
Technical Context
The ST1CC40PUR implements peak current mode control with an internal 850 kHz sawtooth oscillator and transconductance error amplifier referenced to a 97 mV (typ) feedback voltage. Its PWM comparator compares the sensed inductor current against the error amplifier output to regulate LED current via duty-cycle modulation.
It features integrated soft-start (1 ms typ), inhibit logic that reduces quiescent current to 6 µA, and thermal shutdown at 150 °C with 15 °C hysteresis. Protection includes pulse-by-pulse current limiting (5 A max) and short-circuit detection triggering hiccup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.0 V to 18 V - supports wide-range DC inputs including 12 V automotive and 5–15 V industrial rails. |
| Output Current Accuracy | ±7% - ensures consistent LED brightness across temperature and line variations without external calibration. |
| Switching Frequency | 850 kHz (fixed) - enables use of small inductors & ceramic output capacitors, reducing board area by >40% vs. 250 kHz designs. |
| Current Sense Voltage | 97 mV (typ) - minimizes power loss in sensing resistor; allows 0.033 Ω sense for 3 A output (3.2 W dissipation saved vs. 200 mV). |
| RDS(on) HS / LS | 95 mΩ / 69 mΩ - synchronous rectification achieves >92% efficiency at 3 A/12 V input, reducing thermal load on PCB. |
| Standby Current | 6 µA (inhibit mode) - extends battery life in emergency lighting during standby; enables fast wake-up without re-initialization. |
| Thermal Shutdown | 150 °C with 15 °C hysteresis - prevents latch-up during transient overloads; allows safe recovery after cooling. |
Pinout & Package
The ST1CC40PUR is packaged in VFQFPN8 (4 mm × 4 mm, 0.55 mm height), a thermally enhanced wettable flank QFN suitable for automated optical inspection and high-power density layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINA | Analog supply input | Powers internal bandgap, error amplifier, and logic; decoupled separately from power path to reduce noise coupling. |
| INH | Inhibit control input | Active-low enable; internal pull-down not provided - requires external 100 kΩ pulldown or tie to VIN if unused. |
| FB | Current sense feedback | Connects to low-side current-sense resistor; 97 mV reference sets IOUT = 97 mV / RSENSE. |
| AGND | Analog ground | Reference for VINA, FB, and INH; must be star-connected to PGND near chip to avoid ground bounce errors. |
| NC | No connect | Pin 5 is unconnected internally - leave floating or omit pad in layout. |
| VINSW | Power input (high-side switch source) | Connects directly to input capacitor; carries full input current and high di/dt - requires short, wide trace. |
| SW | Switch node | Drives external inductor; high dv/dt node - minimize loop area with inductor and input cap to reduce EMI. |
| PGND | Power ground | Return path for high-side and low-side MOSFETs; must be solid copper pour under chip, thermally connected to exposed pad. |
Key Features
| Feature | Design Value |
|---|---|
| Embedded compensation network | RC = 70 kΩ, CC = 195 pF - eliminates need for external compensation components; stabilizes loop across 1–10 µH inductors and 10–47 µF ceramics. |
| Synchronous rectification | Integrated 95 mΩ HS / 69 mΩ LS MOSFETs - avoids external Schottky losses; improves full-load efficiency by 8–12% vs. asynchronous buck. |
| Hiccup-mode overcurrent protection | Triggers at 5 A peak, then cycles ON/OFF until fault clears - prevents thermal runaway during LED short or wiring fault. |
| Ceramic output capacitor compliant | Stable with X5R/X7R MLCCs ≥10 µF - removes electrolytic dependency; enables 15-year lifetime and -40 °C to +105 °C operation. |
Applications
| Battery-Powered Emergency Lighting | Architectural Signage |
|---|---|
Use Scenario: Standby-powered LED exit signs with 72-hour backup runtime using LiFePO₄ or lead-acid batteries. IC Role / Device Role / Timing Role: Constant-current regulator controlling 12–24 V, 1–3 A LED strings; manages dimming via PWM on INH pin. Use Value: 6 µA inhibit current extends battery life; ±7% current accuracy maintains uniform luminance across all sign modules. | Use Scenario: Outdoor channel letters and illuminated logos requiring IP67-rated, thermally robust LED drivers. IC Role / Device Role / Timing Role: Primary current source for multi-string RGBW LED arrays; synchronized via external clock for flicker-free video content. Use Value: VFQFPN8 package's 40 °C/W RthJA enables natural convection cooling; hiccup protection survives moisture-induced shorts. |
| High-Brightness Retail Display | Industrial Control Panel Lighting |
Use Scenario: Backlit retail shelf-edge displays with dynamic brightness control and ambient light adaptation. IC Role / Device Role / Timing Role: Precision current source for white LED strips; FB pin used for analog dimming via DAC-controlled sense resistor. Use Value: 100 mV sense voltage enables <1% current ripple at 1 kHz PWM dimming; embedded soft-start prevents inrush stress on thin flex PCB traces. | Use Scenario: Operator interface panels in factory automation where LEDs indicate status under vibration, dust, and wide temperature swings. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with thermal shutdown and UVLO; operates from 24 VDC industrial rail with ±15% tolerance. Use Value: -40 °C to +150 °C junction rating ensures reliability in uncooled enclosures; SO8-BW option available for through-hole reworkability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current buck LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409QMY/NOPB | Adjustable 1–2.5 MHz frequency; external compensation required; no integrated low-side FET (requires external sync rectifier). | Higher-frequency operation enables smaller magnetics but increases layout sensitivity and EMI filtering burden. | Choose when system-level EMI testing permits higher switching noise and design team has compensation expertise. |
| MPQ4425AGU-AEC1-P | AEC-Q100 qualified; 2 A max output; 500 kHz fixed frequency; 100 mV sense; integrated MOSFETs. | Limited to automotive interior lighting; lower current rating restricts use in multi-LED string applications. | Choose only for automotive-grade projects requiring AEC-Q100 compliance and ≤2 A drive capability. |
Compared with LM3409QMY/NOPB, ST1CC40PUR offers plug-and-play stability and lower BOM count; versus MPQ4425AGU-AEC1-P, it delivers 50% higher current and broader industrial temperature support without automotive qualification overhead.
Availability
ST1CC40PUR is available at Aetrix Electronics and suitable for battery charger systems, emergency lighting installations, and high-brightness LED driving applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for ST1CC40PUR 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.
The ST1CC40PUR belongs to ST's LED lighting controller product line, engineered specifically for high-efficiency, thermally resilient constant-current DC-DC conversion in space-constrained LED applications - prioritizing integration, protection, and ease of layout.
FAQ
What is the recommended minimum sense resistor value for 3 A output?
With a typical FB reference voltage of 97 mV, the minimum sense resistor is RSENSE = 97 mV / 3 A = 32.3 mΩ. A standard 33 mΩ, 1% tolerance, 0805 thick-film resistor is recommended. Lower values increase current-sense noise susceptibility; values below 25 mΩ require Kelvin sensing to maintain ±7% accuracy.
Can ST1CC40PUR drive multiple parallel LED strings?
Yes, but only with external current balancing - the IC regulates total output current, not per-string current. For parallel strings, use matched forward-voltage LEDs or add individual sense resistors per string with summing into FB. Unbalanced strings may cause current hogging; thermal derating is required above 2.5 A total due to RDS(on) heating.
Is the VFQFPN8 package lead-free and RoHS-compliant?
Yes, ST1CC40PUR (VFQFPN8) is manufactured with lead-free terminations and fully complies with EU RoHS Directive 2011/65/EU and REACH SVHC regulations. The package uses matte tin plating over copper leadframe and meets JEDEC J-STD-020D moisture sensitivity level 3 (MSL3) for standard SMT assembly.
How does thermal shutdown interact with hiccup-mode overcurrent protection?
Thermal shutdown (150 °C) and hiccup-mode OCP (5 A peak) operate independently. If both occur simultaneously - e.g., sustained short-circuit causing rapid junction heating - thermal shutdown takes priority and holds the device OFF until junction cools below 135 °C (15 °C hysteresis), after which hiccup cycling resumes if the fault persists.
ST1CC40PUR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 8-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 3V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- -
- Current - Output / Channel:
- 3A
- Frequency:
- 850kHz
- Dimming:
- -
- Applications:
- Lighting, Signage
- Operating Temperature:
- -40°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VFQFPN (4x4)
ST1CC40PUR FAQ
1.How can I place an order for ST1CC40PUR through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1CC40PUR 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 ST1CC40PUR reliable?
The price and inventory of ST1CC40PUR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1CC40PUR is usually 5 days.
3.What payment methods are accepted for ST1CC40PUR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1CC40PUR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1CC40PUR?
ST1CC40PUR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1CC40PUR 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 ST1CC40PUR?
For technical support, including ST1CC40PUR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1CC40PUR requirements.
6.How does Aetrix verify that ST1CC40PUR is sourced from the original manufacturer or authorized distributors?
All ST1CC40PUR 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 ST1CC40PUR meets industry standards.
7.What is the process for return or replacement of ST1CC40PUR?
All ST1CC40PUR units undergo pre-shipment inspection (PSI). If there is an issue with ST1CC40PUR, 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 ST1CC40PUR part is unused and in its original packaging.
Return procedure for ST1CC40PUR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ST1CC40PUR Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
