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STMicroelectronics STLED25JR
- Part No.:
- STLED25JR
- Manufacturer:
- STMicroelectronics
- Category:
- LED Drivers
- Package:
- 12-UFBGA, FCBGA
- Datasheet:
-
STLED25JR.pdf
- Description:
- IC LED DRV RGLTR PWM 12FLIPCHIP
- Quantity:
- Payment:
- Shipping:
Inventory:7,757
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Product details
Overview
STLED25JR from STMicroelectronics is a 5-channel, fixed-frequency boost DC-DC white LED driver with integrated high-side current sources, operating from 2.3 V to 5.5 V input, delivering up to 125 mA total output current at up to 7.5 V per channel, and featuring ±7.5% LED current accuracy and 2.5 MHz switching frequency for compact LCD backlighting in space-constrained portable devices.
For engineers reviewing the STLED25JR datasheet, STLED25JR pinout, STLED25JR application, or STLED25JR equivalent, this page provides verified technical context on its dual-enable PWM dimming architecture, open/short LED fault detection per channel, CSP-12 flip-chip package constraints, and efficiency behavior across 50–100 mA load range.
Technical Context
The STLED25JR integrates a current-mode boost converter with five independent high-side current sources, each capable of driving one or two series-connected white LEDs; output voltage is dynamically regulated to 135 mV above the highest forward voltage (VF) among active strings to maintain current source headroom.
It uses two enable inputs-EN13 (controls D1–D3) and EN45 (controls D4–D5)-that serve dual roles as digital enables and PWM dimming inputs (100–800 Hz, 0.39–100% duty cycle); internal 100 kΩ pull-downs ensure defined shutdown state, and self-test logic isolates failed channels without disabling functional ones.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V - supports single-cell Li-ion (2.7–4.2 V) and Li-polymer battery operation with UVLO at 1.9 V (rising) |
| Total Output Current | 125 mA - maximum combined current across all five channels, enabling up to 10 LEDs (2 per channel) in LCD backlight applications |
| LED Current Accuracy | ±7.5% - absolute channel accuracy over 5–25 mA range ensures consistent brightness across display zones |
| Switching Frequency | 2.5 MHz (typ.) - enables use of small 4.7 µH inductors and low-ESR ceramic capacitors for minimal board area |
| Efficiency @ 100 mA | 86% - measured at VIN = 3.7 V, VOUT = 6.2 V, minimizing thermal load in handheld form factors |
| Current Matching | ±5.5% - inter-channel current deviation ensures uniform luminance across multi-string backlight arrays |
| PWM Dimming Linearity | ±10% error at 0.39% duty cycle - supports fine-grained low-brightness control required for ambient light adaptation |
Pinout & Package
STLED25JR is housed in a 12-bump flip-chip CSP package measuring 1.4 × 1.8 mm with 0.4 mm pitch and 0.5 mm height, optimized for ultra-thin mobile PCBs and requiring solder-mask-defined pads per JEDEC MO-220 standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power supply input | Connects to battery rail; supports 2.3–5.5 V with internal UVLO and 0.5 µA shutdown current |
| ISET | Current reference setting | Connects external resistor to GND; 1.28 V internal reference × 390 mirror ratio sets LED current (e.g., 25 kΩ → 20 mA) |
| D1–D5 | High-side LED current outputs | Each drives one or two series white LEDs; includes open/short protection and automatic channel disable on fault |
| EN13 | Enable/dimming for channels 1–3 | Active-high PWM input (100–800 Hz); internally pulled down; assertion initiates soft-start and enables D1–D3 |
| EN45 | Enable/dimming for channels 4–5 | Active-high PWM input (100–800 Hz); independently controlled from EN13 to support asymmetric backlight zoning |
| GND | Power and signal ground | Common return for VIN, ISET, and all LED cathodes; requires low-impedance plane connection for thermal and noise control |
| SW | Boost switch node | Connects to inductor; carries pulsed current up to 650 mA peak; requires tight layout to minimize EMI and ringing |
| VOUT | Boost output capacitor node | Regulated DC output feeding all current sources; OVP threshold at 9.05 V (typ.) with 250 mV hysteresis |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel open/short LED fault detection | Identifies and disables individual failed D1–D5 strings while maintaining operation of healthy channels, preventing thermal runaway and preserving partial backlight functionality |
| Dynamic VOUT regulation | Automatically adjusts output voltage to 100 mV above highest VF string, minimizing power loss in current sources and improving system efficiency by ~3% vs. fixed-VOUT designs |
| Soft-start and inrush limiting | Controls startup dI/dt on VIN and SW nodes, limiting peak inductor current to 650 mA and preventing battery sag or input capacitor stress during power-on |
| Thermal shutdown with hysteresis | Shuts down at 150 °C junction temperature and resumes at 135 °C, allowing safe recovery without external intervention in thermally constrained enclosures |
| Low-quiescent-current shutdown | Draws only 0.5 µA (typ.) when both EN13 and EN45 are low, extending standby battery life in always-on display subsystems |
Applications
| Smartphone LCD Backlight | Tablet Display Driver |
|---|---|
|
Use Scenario: Driving 8–10 white LEDs arranged in five parallel strings (two per channel) behind an IPS LCD panel in a 5.5-inch smartphone with dynamic brightness scaling. IC Role / Device Role / Timing Role: High-efficiency boost + linear current regulation IC providing precise per-string current control and synchronized PWM dimming via EN13/EN45. Use Value: Enables <1% brightness uniformity error across display zones and extends battery runtime by sustaining >85% efficiency at 75 mA typical load. |
Use Scenario: Powering dual-zone edge-lit LED array (5 strings × 2 LEDs) in a 10.1-inch tablet, supporting local dimming through independent EN13/EN45 control. IC Role / Device Role / Timing Role: Integrated LED driver with per-channel fault isolation, allowing continued operation of top/bottom backlight zones even if one string fails. Use Value: Eliminates full-display blackouts due to single-LED opens, reducing warranty claims and enabling field-repairable backlight modules. |
| Portable Medical Display | Industrial Handheld Terminal |
|
Use Scenario: Illuminating high-contrast monochrome LCD in a battery-powered patient monitor requiring stable luminance over wide temperature (-20°C to +70°C) and 10+ year service life. IC Role / Device Role / Timing Role: Precision LED driver with ±7.5% current accuracy and thermal derating logic, ensuring consistent brightness despite battery voltage decay and ambient drift. Use Value: Maintains display readability under clinical lighting conditions while meeting IEC 60601-1 leakage and thermal safety requirements. |
Use Scenario: Backlighting ruggedized QVGA LCD in warehouse barcode scanner operating from 3.0–4.2 V Li-ion with frequent on/off cycling and shock exposure. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with short-circuit protection on all D1–D5 pins and robust EN input thresholds tolerant of noisy industrial grounds. Use Value: Prevents catastrophic failure from LED wire breakage or ESD events, reducing field returns and supporting IP65-rated enclosure integration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-channel, 40 V boost with analog+PWM dimming; no per-channel fault detection; 1.2 MHz switching | Requires external current mirrors for multi-string operation; lacks STLED25JR's integrated 5-channel architecture and open-LED auto-isolation | Select when designing simpler, lower-channel-count backlights where board area allows discrete current-setting resistors |
| MAX16832ATP+ | 4-channel, 36 V boost with ±3% current accuracy; 500 kHz switching; thermal foldback instead of shutdown | Higher accuracy but larger TQFN-20 package (4×4 mm); no native dual-enable PWM zoning like EN13/EN45 | Prefer for high-precision industrial displays where thermal continuity matters more than ultra-compact footprint |
Compared with TPS61165DRVR and MAX16832ATP+, STLED25JR uniquely combines 5-channel integration, per-string fault isolation, 2.5 MHz operation for miniaturization, and dual-enable zoning-making it optimal for space-constrained, reliability-critical portable LCD backlights.
Availability
STLED25JR is available at Aetrix Electronics and suitable for smartphone LCD backlighting, tablet display drivers, portable medical monitors, and industrial handheld terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for STLED25JR 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, MEMS, and microcontroller solutions for automotive, industrial, and consumer markets.
STLED25JR belongs to ST's LED lighting driver product line, engineered specifically for ultra-compact, high-efficiency white LED backlighting in battery-powered portable electronics with stringent thermal and reliability requirements.
FAQ
What is the minimum recommended RSET value for STLED25JR, and how does it affect maximum LED current?
The minimum RSET value is 15 kΩ, corresponding to a maximum LED current of 25 mA per channel (ILED = 1.28 V × 390 / RSET). At 15 kΩ, total output reaches 125 mA (5 × 25 mA). Lower resistance increases current but risks exceeding absolute maximum ratings and degrading current matching accuracy beyond ±10%.
How does STLED25JR handle an open LED condition on D2, and what happens to the other channels?
When D2 opens, STLED25JR detects rising VOUT until OVP threshold (9.05 V) is reached, identifies D2 as the fault source via internal sensing, and disables only the D2 current source. Channels D1, D3–D5 remain fully operational with unchanged current and dimming control, preserving partial backlight functionality and avoiding thermal overload.
Can EN13 and EN45 be driven with different PWM frequencies simultaneously, and what is the supported range?
Yes-EN13 and EN45 accept independent PWM signals from 100 Hz to 800 Hz, enabling asymmetric dimming of upper (D1–D3) and lower (D4–D5) backlight zones. The device maintains linearity within ±10% error across 0.39–100% duty cycle at 300 Hz, with reduced error (<2%) above 10% duty cycle.
What thermal derating applies to STLED25JR above 85°C ambient, and how is junction temperature monitored?
No explicit derating curve is specified above 85°C ambient, but the device enters thermal shutdown at 150°C junction temperature (TJ) and resumes at 135°C. Junction temperature is monitored continuously by an on-die sensor; RTHJA is 62°C/W on a 4-layer PCB with 1 inch² cooling area, so at 125 mA load and 3.7 V input, TJ rise is ~45°C above ambient under typical conditions.
STLED25JR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 12-UFBGA, FCBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 5
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 8.8V
- Current - Output / Channel:
- 125mA
- Frequency:
- 2.5MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-FlipChip (1.4x1.8)
STLED25JR FAQ
1.How can I place an order for STLED25JR through Aetrix?
Please submit a Request for Quotation (RFQ) for STLED25JR 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 STLED25JR reliable?
The price and inventory of STLED25JR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STLED25JR is usually 5 days.
3.What payment methods are accepted for STLED25JR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STLED25JR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STLED25JR?
STLED25JR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STLED25JR 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 STLED25JR?
For technical support, including STLED25JR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STLED25JR requirements.
6.How does Aetrix verify that STLED25JR is sourced from the original manufacturer or authorized distributors?
All STLED25JR 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 STLED25JR meets industry standards.
7.What is the process for return or replacement of STLED25JR?
All STLED25JR units undergo pre-shipment inspection (PSI). If there is an issue with STLED25JR, 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 STLED25JR part is unused and in its original packaging.
Return procedure for STLED25JR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STLED25JR Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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