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STMicroelectronics STP4CMPQTR
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- Part No.:
- STP4CMPQTR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 20-UFQFN
- Datasheet:
-
STP4CMPQTR.pdf
- Description:
- IC LED DRVR RGLTR PWM 30MA 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:950
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Product details
Overview
STP4CMPQTR from STMicroelectronics is a low-voltage, 4-channel constant-current LED driver with integrated charge pump, designed for RGB illumination and LCD display backlighting in space-constrained portable devices. It operates from 2.7 V to 5.5 V, delivers up to 30 mA per channel with ±7% absolute current accuracy and ±4% channel-to-channel mismatch, and supports LED forward voltages up to 3.8 V using a regulated 5 V charge-pump output.
For engineers reviewing the STP4CMPQTR datasheet, STP4CMPQTR pinout, STP4CMPQTR application, or STP4CMPQTR equivalent, key selection considerations include individual ISET resistor programming per channel, independent ONx/PWM brightness control, CP_SEL-configurable charge pump enable/disable, thermal shutdown at 150 °C, and QFN20 (1.8×3.2 mm) footprint compatibility with high-density mobile PCB layouts.
Technical Context
The STP4CMPQTR implements a switched-capacitor charge pump with clamped 5 V output to provide headroom for driving LEDs whose forward voltage exceeds VCC - enabling operation down to 2.7 V while supporting 3.8 V LEDs. The pump is controlled via CP_SEL and uses external C1P/C1N ceramic bucket capacitors.
Each of the four current sinks is independently enabled via active-high ON1–ON4 pins, with internal 300 kΩ pull-downs; brightness is modulated by PWM applied directly to these pins (min. 33 µs TON/TOFF). Output current per channel is set by an external resistor (RSET) connected between ISETx and GND, following RSET = 16 × (1.22 / ILED).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2.7 V to 5.5 V - enables direct battery operation from single Li-ion or dual alkaline cells without LDO pre-regulation. |
| Max. Output Current/Ch | 30 mA - sufficient to drive standard RGB indicator LEDs or small-area backlight segments at full brightness. |
| Current Accuracy | ±7% absolute, ±4% channel-to-channel - ensures consistent color balance across RGB channels without calibration. |
| Charge Pump Output | Clamped at 5 V (typ.) - provides fixed headroom to sink current into LEDs with VF up to 3.8 V even at low input voltage. |
| Thermal Shutdown | 150 °C with 15 °C hysteresis - protects against sustained overloads or shorted LED strings without external circuitry. |
| Package | QFN20 (1.8 × 3.2 mm, 0.4 mm pitch) - supports ultra-compact placement adjacent to display modules in smartphones and wearables. |
Pinout & Package
STP4CMPQTR is housed in a thermally enhanced, lead-free, RoHS-compliant QFN20 package (1.8 mm × 3.2 mm, 0.4 mm pitch), with exposed thermal pad (Pin 20) connected to GND for junction-to-board heat dissipation. The 20-pin layout supports compact routing of four independent LED sink paths and dual capacitor nodes (C1P/C1N) for charge pump stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ON1–ON4 | Active-high channel enable | Direct PWM interface for per-channel brightness control; internal 300 kΩ pull-down ensures safe OFF state at power-up. |
| EN | Global device enable | Shuts down entire IC with ≤5 µA quiescent current; internal 300 kΩ pull-down guarantees default disable on power-up. |
| ISET1–ISET4 | Current-setting reference input | Connects to external resistor to ground; sets LED sink current per channel via precise internal 1.22 V reference and scaling factor. |
| LED1–LED4 | Constant-current sink output | Drives cathode of external LED; each pin sources no current - only sinks programmed ILED when corresponding ONx is high. |
| CP_SEL | Charge pump mode control | High = enable 5 V clamp; Low = bypass pump (VOUT = VCC); internal 300 kΩ pull-down defaults to disabled mode. |
| C1P / C1N | Charge pump capacitor terminals | Differential node for 1 µF ceramic bucket capacitor; requires tight placement per layout guidelines to minimize ESR-induced ripple. |
| VOUT | Regulated charge pump output | Supplies bias to all four current sinks; must be decoupled with 10 µF ceramic capacitor close to pin for stable regulation. |
| VCC | Main supply input | Accepts unregulated battery input; powers logic, reference, and charge pump circuitry; bypass with 100 nF capacitor. |
| GND (Pins 10 & 20) | Power and thermal reference | Pin 20 is exposed thermal pad - must be soldered to large PCB copper area for thermal management and noise reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Individually programmable current per channel | 2.5 mA to 30 mA via discrete RSET resistors - enables mixed-color LED arrays with tailored brightness without software overhead. |
| Independent ONx PWM control | Supports 33 µs minimum pulse width - allows >15 kHz dimming frequency for flicker-free human-visible LED control. |
| Configurable charge pump | Enable/disable via CP_SEL pin - eliminates switching losses when VCC ≥ LED VF, improving efficiency in high-VCC scenarios. |
| Integrated thermal protection | Auto-recovery shutdown at 150 °C with 15 °C hysteresis - prevents permanent damage during transient overloads or board-level thermal events. |
| High-accuracy current matching | ±4% channel-to-channel mismatch - maintains RGB color point fidelity across temperature and supply variations without closed-loop feedback. |
Applications
| Smartphone Display Backlight | RGB Status Indicator |
|---|---|
|
Use Scenario: Driving white LED strings behind AMOLED or TFT LCD panels in compact handheld devices. IC Role / Device Role / Timing Role: Constant-current sink providing stable luminance under varying battery voltage (2.7–5.5 V) and ambient temperature (−30 to +85 °C). Use Value: Eliminates need for boost converter + current regulator combo; reduces BOM count by integrating charge pump and 4-channel control in 1.8×3.2 mm footprint. |
Use Scenario: Illuminating multi-color status LEDs on consumer electronics front panels or industrial HMI bezels. IC Role / Device Role / Timing Role: Independent per-channel current source enabling simultaneous red/green/blue activation with precise intensity ratio control. Use Value: Achieves consistent color rendering across channels (±4% mismatch) without factory calibration, reducing test time and yield loss. |
| Wearable Device UI Lighting | Automotive Interior Ambient Lighting |
|
Use Scenario: Powering small-form-factor RGB LEDs in smartwatches and fitness trackers where PCB area is <10 mm². IC Role / Device Role / Timing Role: Ultra-compact LED driver with thermal shutdown and low quiescent current (<5 µA in shutdown) for battery longevity. Use Value: QFN20 package fits within tight mechanical constraints; 300 kΩ internal pull-downs eliminate need for external bias resistors on ON/EN/CP_SEL pins. |
Use Scenario: Controlling soft ambient lighting zones (e.g., door handle, cup holder, footwell) in automotive cabins. IC Role / Device Role / Timing Role: Robust current sink operating across extended temperature range (−40 to +85 °C) and immune to load transients from cable harness inductance. Use Value: Thermal protection and ±7% absolute current accuracy ensure reliable long-term operation without LED current drift or thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC59283RTJR | 16-bit PWM-controlled, no integrated charge pump; requires external 5 V supply for >3.3 V LED VF. | Designed for high-resolution grayscale control in signage; lacks thermal shutdown and VCC-range flexibility. | Select when precise 16-bit dimming is required and system already provides stable 5 V rail. |
| MAX16826ATL+T | Boost-based architecture; supports up to 40 V output; higher quiescent current (1.2 mA vs. 17.2 mA active). | Targeted at automotive exterior lighting; larger 20-pin TQFN (4×4 mm) increases PCB area by 2.2×. | Select when driving high-VF LEDs (>5 V) or requiring AEC-Q100 qualification. |
Compared with TLC59283RTJR and MAX16826ATL+T, STP4CMPQTR uniquely combines charge-pump voltage boosting, ±4% channel matching, and QFN20 size - making it optimal for battery-powered RGB backlighting where space, accuracy, and input voltage range are critical.
Availability
STP4CMPQTR is available at Aetrix Electronics and suitable for smartphone display backlighting, RGB status indicators, wearable UI lighting, and automotive interior ambient lighting requiring stable component supply and long-term manufacturability.
Supply support for STP4CMPQTR 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 microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.
The STP4CMPQTR belongs to ST's LED driver product line, engineered specifically for low-voltage, multi-channel constant-current applications in portable and space-constrained electronics where efficiency, accuracy, and integration are prioritized.
FAQ
What is the minimum PWM frequency supported for brightness control on STP4CMPQTR?
The STP4CMPQTR supports PWM dimming with a minimum pulse width of 33 µs for both ON and OFF states, corresponding to a maximum practical frequency of approximately 15.15 kHz. This avoids audible noise while ensuring reliable channel switching across the full operating temperature range (−40 to +85 °C) and supply voltage (2.7–5.5 V).
Can STP4CMPQTR drive LEDs with forward voltage higher than VCC without external components?
Yes - the integrated charge pump generates a regulated 5 V output (clamped) when CP_SEL is high, enabling the device to sink current into LEDs with forward voltage up to 3.8 V even when VCC is as low as 2.7 V. No external boost converter or additional regulators are required.
How does thermal protection behave during sustained overload conditions?
When junction temperature reaches 150 °C, STP4CMPQTR shuts down all outputs and reduces supply current to ≤5 µA. It remains latched off until temperature falls by 15 °C (to ~135 °C), then resumes normal operation automatically - no external reset or power cycle is needed.
Is the QFN20 thermal pad electrically connected, and how should it be handled on the PCB?
Yes - Pin 20 is the exposed thermal pad, internally connected to GND. It must be soldered to a dedicated GND copper pour with ≥4 thermal vias (0.3 mm diameter) connecting to inner-layer GND planes. This ensures both electrical grounding and effective heat transfer to maintain TJ < 125 °C at 30 mA per channel.
STP4CMPQTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-UFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 3.8V
- Current - Output / Channel:
- 30mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3.2x1.8)
STP4CMPQTR FAQ
1.How can I place an order for STP4CMPQTR through Aetrix?
Please submit a Request for Quotation (RFQ) for STP4CMPQTR 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 STP4CMPQTR reliable?
The price and inventory of STP4CMPQTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STP4CMPQTR is usually 5 days.
3.What payment methods are accepted for STP4CMPQTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STP4CMPQTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STP4CMPQTR?
STP4CMPQTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STP4CMPQTR 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 STP4CMPQTR?
For technical support, including STP4CMPQTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STP4CMPQTR requirements.
6.How does Aetrix verify that STP4CMPQTR is sourced from the original manufacturer or authorized distributors?
All STP4CMPQTR 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 STP4CMPQTR meets industry standards.
7.What is the process for return or replacement of STP4CMPQTR?
All STP4CMPQTR units undergo pre-shipment inspection (PSI). If there is an issue with STP4CMPQTR, 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 STP4CMPQTR part is unused and in its original packaging.
Return procedure for STP4CMPQTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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