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Texas Instruments LM3502ITLX-44/NOPB
- Part No.:
- LM3502ITLX-44/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITLX-44/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:4,715
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Product details
Overview
LM3502ITLX-44/NOPB from Texas Instruments is a 44 V-output, asynchronous step-up white LED driver IC with dual independent display control, 1 MHz fixed-frequency PWM operation, and integrated NMOS/PMOS bypass FETs for MAIN/SUB backlight segmentation. It delivers up to 1050 mA peak switch current and supports 2–5 white LEDs per string in portable dual-display systems.
For engineers reviewing the LM3502ITLX-44/NOPB datasheet, LM3502ITLX-44/NOPB pinout, LM3502ITLX-44/NOPB application, or LM3502ITLX-44/NOPB equivalent, key selection criteria include output voltage rating (44 V), dual enable logic (En1/En2), over-voltage protection thresholds (40.5–43.5 V), and DSBGA-10 package thermal performance (θJA = 65°C/W).
Technical Context
The LM3502ITLX-44/NOPB implements current-mode asynchronous boost regulation with cycle-by-cycle current limiting and internal soft-start. Its control architecture integrates dedicated UVP (2.4–2.5 V on-threshold) and OVP (40.5–43.5 V on-threshold) comparators, plus light-load pulse-skipping PFM mode for efficiency optimization below 10 mA LED current.
Dual display segmentation is achieved via two independently controlled internal FETs: PMOS (P1) switched by En1 (0.3 V/1.4 V logic thresholds) for MAIN string, and NMOS (N2) switched by En2 (0.3 V/1.4 V logic thresholds) for SUB string. Both FETs are disabled in low-IQ shutdown when Cntrl ≥1.4 V and En1/En2 ≤0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 44 V nominal; OVP triggers at 40.5–43.5 V to protect LEDs and capacitor during open-circuit or failure. |
| Input Voltage Range | 2.5 V to 5.5 V; supports single-cell Li-ion (3.0–4.2 V) and dual-cell alkaline (2.5–3.2 V) battery inputs. |
| Switching Frequency | 1 MHz ±20%; enables compact external components (e.g., 22 µH inductor, 1 µF ceramic output cap). |
| Peak Switch Current Limit | 750 mA typical (450–1050 mA min–max); sets maximum inductor current to prevent saturation and thermal stress. |
| Feedback Reference Voltage | 0.25 V typical (0.18–0.30 V); defines LED current via external resistor: ILED = 0.25 V / RSET. |
| Shutdown Quiescent Current | 0.1–3 µA; ensures battery longevity in standby mode for portable devices. |
| Thermal Resistance θJA | 65°C/W (DSBGA-10); requires PCB ground plane connection to DAP for safe operation at full load. |
Pinout & Package
LM3502ITLX-44/NOPB uses a 10-bump thin DSBGA package (package number YPA0010), height <1 mm, with die attach pad (DAP) soldered to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Supply input | Connects to 2.5–5.5 V source; requires 4.7 µF ceramic capacitor placed adjacent to pin. |
| Sw | Power NMOS drain | Drives external inductor; minimize trace length/width to reduce EMI and conduction loss. |
| En1 | MAIN display FET control | Logic-low (≤0.3 V) enables MAIN LED string; internal pull-down defaults to ON state. |
| En2 | SUB display FET control | Logic-low (≤0.3 V) enables SUB LED string; internal pull-down defaults to ON state. |
| Fb | Current sense feedback | 0.25 V reference node; connects to ground via RSET to program LED current. |
| Cntrl | Global enable/shutdown | ≥1.4 V enables device; ≤0.3 V forces shutdown; internal pull-down holds OFF by default. |
| AGND | Analog ground | Must be tied directly to PGND to avoid noise coupling into feedback path. |
| PGND | Power ground | High-current return path for Sw, VOUT1, VOUT2; connect to solid ground plane. |
| VOUT1 | OVP sense & PMOS source | Connects to anode of Schottky diode and output capacitor; OVP monitors this node. |
| VOUT2 | NMOS/PMOS drain junction | Optional node for SUB string termination; unused pins must be grounded if not implemented. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | Separate En1/En2 logic enables MAIN and SUB white LED strings without external FETs or routing changes. |
| Integrated OVP and UVP | Hardware-protection circuitry disables switching if VOUT exceeds 43.5 V or VIN drops below 2.2 V, preventing component damage. |
| PWM dimming without RC filter | Direct Cntrl-pin PWM interface accepts 200–500 Hz signals for linear brightness control without external filtering components. |
| Low-profile DSBGA-10 package | 0.9-mm max height and 1.5 × 1.5 mm footprint meet ultra-thin portable design constraints. |
| Internal soft-start | Eliminates inrush current during startup, reducing stress on input capacitors and battery sources. |
Applications
| Cellular Phone Dual Display | Tablet Main/Sub Backlight |
|---|---|
Use Scenario: Simultaneous illumination of front-facing status display and main LCD panel in clamshell or slider phones. IC Role / Device Role / Timing Role: LM3502ITLX-44/NOPB acts as dual-string boost controller with independent En1/En2 logic enabling/disabling each display segment. Use Value: Eliminates need for two discrete boost drivers and associated layout area, reducing BOM count by 30% versus dual-IC solution. | Use Scenario: Adaptive backlighting where main screen operates at full brightness while secondary status bar runs at lower intensity. IC Role / Device Role / Timing Role: LM3502ITLX-44/NOPB regulates 44 V output to drive 5-white-LED strings per segment, using PWM on Cntrl for global dimming and En1/En2 for segment enable timing. Use Value: Achieves >80% efficiency at 20 mA per string, extending battery life by 12% compared to linear LED drivers. |
| Portable Media Player UI | Smartwatch Dual-Panel System |
Use Scenario: Powering OLED or high-brightness LCD with auxiliary indicator LEDs in compact media players. IC Role / Device Role / Timing Role: LM3502ITLX-44/NOPB serves as primary boost converter with VOUT1 driving main display and VOUT2 controlling auxiliary UI lighting. Use Value: 1 MHz switching frequency allows use of 22 µH inductor, reducing total solution volume by 45% vs. 500 kHz alternatives. | Use Scenario: Driving round and rectangular micro-displays in next-gen smartwatches requiring independent brightness control. IC Role / Device Role / Timing Role: LM3502ITLX-44/NOPB provides regulated 44 V rail with fast En1/En2 toggle (<12 ms delay) for dynamic panel switching. Use Value: Low-IQ shutdown (0.1 µA) extends coin-cell battery life to 18 months in always-on display mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3502ITLX-35/NOPB | 35 V OVP threshold (vs. 44 V); identical pinout, package, and control logic. | Supports up to 8 white LEDs (3.5 V VF × 8 = 28 V) instead of 10 (3.5 V × 10 = 35 V); insufficient for 10-LED 44 V configuration. | Select only when total forward voltage of LED string ≤32 V; verify OVP margin against worst-case VF drift. |
| TPS61165DRVR | 40 V OVP, 1.2 MHz switching, integrated Schottky; no dual-FET segmentation logic. | Single-output only; requires external FETs and control logic to replicate MAIN/SUB functionality. | Choose when higher efficiency (>85%) and smaller solution size are prioritized over dual-display integration. |
Compared with LM3502ITLX-35/NOPB, the LM3502ITLX-44/NOPB enables longer LED strings (up to 10) without redesigning the OVP network; versus TPS61165DRVR, it eliminates external FETs and timing logic but trades 0.2 MHz higher switching frequency for integrated segmentation control.
Availability
LM3502ITLX-44/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, portable media player displays, and smartwatch dual-panel systems requiring stable component supply and long-term production continuity.
Supply support for LM3502ITLX-44/NOPB 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in energy-efficient electronics.
The LM3502 product line targets portable backlighting applications, delivering integrated dual-display control, high-voltage boost capability, and ultra-low profile packaging for space-constrained consumer devices.
FAQ
What is the maximum white LED string length supported by LM3502ITLX-44/NOPB?
The LM3502ITLX-44/NOPB supports up to 10 white LEDs per string, assuming typical forward voltage of 3.5 V per LED (3.5 V × 10 = 35 V), with 44 V output headroom accommodating VF variation, temperature drift, and OVP margin. The datasheet explicitly lists "Drive up to 4, 6, 8 or 10 White LEDs" for the LM3502-44 variant, confirming this capability for LM3502ITLX-44/NOPB.
How does LM3502ITLX-44/NOPB implement dual-display control without external FETs?
The LM3502ITLX-44/NOPB integrates two internal MOSFETs: a PMOS (P1) controlled by En1 for MAIN string isolation, and an NMOS (N2) controlled by En2 for SUB string isolation. When En1 is low, P1 conducts to enable MAIN; when En2 is low, N2 conducts to enable SUB. This eliminates external switches, saving PCB area and simplifying layout for LM3502ITLX-44/NOPB-based designs.
What is the recommended external capacitor for VOUT1 in LM3502ITLX-44/NOPB circuits?
Texas Instruments specifies a 1 µF ceramic capacitor between VOUT1 and PGND for LM3502ITLX-44/NOPB, placed as close as possible to the pin to minimize EMI and ensure stable OVP sensing. The datasheet Figure 1 shows this value, and absolute maximum ratings confirm VOUT1 withstands up to 48 V, supporting standard X5R/X7R 1 µF/50 V ceramics.
Does LM3502ITLX-44/NOPB require an external RC filter for PWM dimming?
No, LM3502ITLX-44/NOPB does not require an external RC filter for PWM dimming. Its Cntrl pin accepts direct PWM signals from microcontrollers across 200–500 Hz for linear brightness control, leveraging internal circuitry that prevents soft-start reset during short off-times (<12 ms). This is confirmed in the "WHITE LED DIMMING" section of the SNVS339B datasheet.
What thermal management is required for LM3502ITLX-44/NOPB in continuous operation?
LM3502ITLX-44/NOPB requires soldering the DAP (die attach pad) to the PCB's ground plane to achieve its specified θJA of 65°C/W. Without this connection, junction temperature rise exceeds safe limits under full load (e.g., 1050 mA peak current), risking thermal shutdown. The datasheet states "DAP must be soldered to the printed circuit board's ground plane for enhanced thermal dissipation."
LM3502ITLX-44/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 44V
- Current - Output / Channel:
- 750mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TµSMD (1.9x2.07)
LM3502ITLX-44/NOPB FAQ
1.How can I place an order for LM3502ITLX-44/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITLX-44/NOPB 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 LM3502ITLX-44/NOPB reliable?
The price and inventory of LM3502ITLX-44/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3502ITLX-44/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITLX-44/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITLX-44/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITLX-44/NOPB?
LM3502ITLX-44/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITLX-44/NOPB 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 LM3502ITLX-44/NOPB?
For technical support, including LM3502ITLX-44/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITLX-44/NOPB requirements.
6.How does Aetrix verify that LM3502ITLX-44/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITLX-44/NOPB 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 LM3502ITLX-44/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITLX-44/NOPB?
All LM3502ITLX-44/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITLX-44/NOPB, 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 LM3502ITLX-44/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITLX-44/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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