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Texas Instruments LM3502ITL-35/NOPB
- Part No.:
- LM3502ITL-35/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITL-35/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,882
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Product details
Overview
LM3502ITL-35/NOPB from Texas Instruments is a 35V-output, asynchronous current-mode step-up DC/DC converter optimized for dual white LED backlighting in portable devices. It integrates dual internal FET switches (PMOS and NMOS) for independent MAIN/SUB display control, delivers >80% efficiency at 5.5V input, supports 2.5V–5.5V input range, and operates at a fixed 1 MHz switching frequency.
For engineers reviewing the LM3502ITL-35/NOPB datasheet, LM3502ITL-35/NOPB pinout, LM3502ITL-35/NOPB application, or LM3502ITL-35/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed 10-bump DSBGA package mapping, real-world LED current setting behavior, and two manufacturer-validated alternative options for dual-display white LED driver selection.
Technical Context
The LM3502ITL-35/NOPB implements an asynchronous current-mode PWM control architecture with cycle-by-cycle current limiting, over-voltage protection (OVP threshold: 32.0–35.0 V), and under-voltage lockout (UVP: 2.2–2.5 V). Its feedback voltage is fixed at 0.25 V (typ), enabling precise LED current regulation via external resistor.
It features dual independent enable pins (En1, En2) that control separate PMOS and NMOS bypass FETs to selectively activate MAIN and SUB LED strings, while the Cntrl pin enables full device shutdown or PWM dimming without RC filtering. Internal soft-start eliminates inrush current during startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 35 V nominal; OVP active at 32.0–35.0 V - ensures safe operation when LED string opens or fails. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V) and dual-cell alkaline/nickel-based supplies. |
| Switching Frequency | 1 MHz (0.8–1.2 MHz range) - enables use of small, low-profile inductors (e.g., DO1608C-223) and reduces EMI filtering burden. |
| Feedback Voltage | 0.25 V (typ), 0.18–0.30 V (min/max) - sets LED current as ILED = 0.25 V / RSET, enabling accurate, temperature-stable current programming. |
| Efficiency | >80% typical at 5.5 V input and 10 mA–90 mA LED load - minimizes thermal stress and extends battery life in portable displays. |
| Quiescent Current | 1 µA (shutdown), 0.5–1 mA (non-switching), 1.9–3 mA (switching) - supports ultra-low-power standby modes in always-on UI applications. |
| Current Limit | 450–1050 mA (depending on VIN and variant) - protects internal N1 power switch and external components during fault conditions. |
Pinout & Package
LM3502ITL-35/NOPB uses a 10-bump thin DSBGA package (package number YPA0010), height <1 mm, suitable for space-constrained mobile PCB layouts. Thermal performance is enhanced by soldering the DAP (die attach pad) directly to the PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Supply input | Connects to 2.5–5.5 V source; requires local 4.7 µF ceramic capacitor to PGND for stable input filtering. |
| Sw | Power NMOS drain | Drives external inductor; must be routed with minimal trace length/maximum width to reduce EMI and conduction loss. |
| En1 | MAIN display FET control | Logic-level enable for PMOS switch (P1); ≤0.3 V turns MAIN LED string OFF, ≥1.4 V turns it ON. |
| En2 | SUB display FET control | Logic-level enable for NMOS switch (N2); ≤0.3 V turns SUB LED string OFF, ≥1.4 V turns it ON. |
| Fb | Current-sense feedback | Connects to ground via RSET; 0.25 V reference sets LED current - no external compensation required. |
| Cntrl | Global enable/dimming | ≥1.4 V enables device; ≤0.3 V forces shutdown; accepts direct PWM (200–500 Hz optimal) for brightness control. |
| AGND | Analog ground | Must be shorted to PGND at single point to minimize noise coupling into feedback path. |
| PGND | Power ground | High-current return path for Sw, VOUT1, VOUT2; connect directly to PCB ground plane with low-inductance layout. |
| VOUT1 | OVP sense / PMOS source | OVP monitoring node and output for MAIN string; connects to Schottky diode anode and output capacitor. |
| VOUT2 | NMOS/PMOS drain junction | Interconnect node between MAIN and SUB strings; unused in single-string configs - must be grounded if not used. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | Separate En1/En2 logic inputs allow simultaneous or selective activation of MAIN and SUB LED strings without external drivers. |
| Integrated OVP and UVP | Hardware-enforced 32–35 V overvoltage cutoff and 2.2–2.5 V undervoltage lockout protect LEDs, IC, and battery during faults or brownout. |
| PWM dimming without RC filter | Direct Cntrl-pin PWM interface (200–500 Hz optimal) enables microcontroller-driven brightness control with no external passive components. |
| Fixed 1 MHz switching | Enables compact BOM using 2.2 µH inductors and 1 µF ceramic output capacitors - reduces board area and cost vs. lower-frequency alternatives. |
| Low-profile DSBGA package | 10-bump, <1 mm height package (YPA0010) supports ultra-thin mobile designs and improves thermal dissipation via DAP-to-PCB grounding. |
Applications
| Cellular Phone Dual Display | PDA Main + Secondary Screen |
|---|---|
Use Scenario: Simultaneous backlighting of primary LCD and secondary status OLED in clamshell or slider phones. IC Role / Device Role / Timing Role: Dual-string white LED driver with independent En1/En2 control enabling dynamic MAIN/SUB brightness scaling. Use Value: Eliminates need for two discrete boost converters - reduces component count, PCB area, and power supply complexity. |
Use Scenario: Backlight management for main touchscreen and auxiliary keypad or notification display in handheld PDAs. IC Role / Device Role / Timing Role: Single-chip solution providing synchronized or independent PWM dimming of two LED strings via Cntrl, En1, and En2. Use Value: Enables adaptive UI lighting (e.g., dim SUB during sleep mode) while maintaining >80% efficiency across 2.5–5.5 V battery range. |
| Portable Media Player UI | Smartwatch Dual-Segment Display |
Use Scenario: Powering high-brightness front panel and low-power status indicator in MP3/video players. IC Role / Device Role / Timing Role: Step-up regulator delivering regulated 35 V to drive 4–10 white LEDs per string with programmable current via Fb resistor. Use Value: Supports variable LED count per string (2–5 LEDs each) and maintains stable current despite battery voltage sag from 4.2 V to 2.5 V. |
Use Scenario: Driving segmented OLED or LCD backlight zones in circular/square smartwatches with tight height constraints. IC Role / Device Role / Timing Role: Ultra-low-profile DSBGA (YPA0010) LED driver enabling <1 mm Z-height assembly and thermal coupling to ground plane via DAP. Use Value: Meets mechanical stack-up requirements while delivering 35 V OVP-protected output and 1 µA shutdown IQ for extended standby time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3502ITL-44/NOPB | Higher 44 V OVP threshold; identical pinout, package, and control logic; same 10-bump DSBGA (YPA0010). | Supports longer LED strings (up to 10 LEDs at 4.2 V forward drop) - suited for larger displays requiring >35 V compliance. | Select when output voltage margin >35 V is required; no layout change needed. |
| TPS61160DRVR | Single-output 38 V boost LED driver; 1.2 MHz switching; integrated 2-A switch; different pinout and WQFN-16 package. | Lacks dual-string control - requires external logic or second IC for MAIN/SUB separation; higher peak current capability. | Choose for higher-current single-string applications where dual control is unnecessary and board space allows WQFN-16. |
Compared with LM3502ITL-35/NOPB, the LM3502ITL-44/NOPB offers extended output headroom for longer LED strings without altering design layout, while the TPS61160DRVR provides higher drive strength but sacrifices integrated dual-display functionality and requires PCB redesign.
Availability
LM3502ITL-35/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA dual-display systems, and portable media player UI illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3502ITL-35/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 decades of experience in precision power conversion and portable system solutions.
The LM3502 product line was designed specifically for dual-display white LED backlighting in battery-powered consumer electronics, emphasizing integration, efficiency, and ultra-low profile packaging for space-constrained mobile applications.
FAQ
What is the maximum LED string voltage supported by LM3502ITL-35/NOPB?
The LM3502ITL-35/NOPB has a 35 V nominal output rating with over-voltage protection triggered between 31.0 V and 35.0 V. This supports up to 8–10 white LEDs (assuming ~3.2–3.5 V forward voltage per LED) in series while maintaining safety margin against open-circuit failure. The OVP threshold is factory-trimmed and non-adjustable.
How do I set the LED current for LM3502ITL-35/NOPB?
LM3502ITL-35/NOPB sets LED current using a resistor (RSET) from the Fb pin to AGND/PGND. With a typical feedback voltage of 0.25 V, the current is calculated as ILED = 0.25 V / RSET. For example, a 10 Ω resistor yields 25 mA per string. RSET tolerance directly impacts current accuracy.
Can LM3502ITL-35/NOPB drive only one LED string?
Yes, LM3502ITL-35/NOPB can drive a single LED string by connecting VOUT2 to Fb (shorting SUB segment) and grounding En2. In this configuration, En1 controls the entire string, and Cntrl manages global on/off and PWM dimming. The internal NMOS FET (N2) remains inactive, preserving efficiency.
What package type does LM3502ITL-35/NOPB use, and how is thermal performance managed?
LM3502ITL-35/NOPB uses a 10-bump thin DSBGA package (YPA0010) with <1 mm height. Thermal performance relies on soldering the exposed DAP (die attach pad) directly to the PCB's solid ground plane - this provides the primary thermal path and lowers θJA to 65°C/W, critical for sustained 35 V output operation.
Does LM3502ITL-35/NOPB require external compensation components?
No, LM3502ITL-35/NOPB operates with internal compensation and requires no external capacitors or resistors for loop stability. Its current-mode architecture and fixed 1 MHz frequency eliminate the need for compensation networks - simplifying layout and reducing BOM count compared to voltage-mode boost controllers.
LM3502ITL-35/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:
- 35V
- 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)
LM3502ITL-35/NOPB FAQ
1.How can I place an order for LM3502ITL-35/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITL-35/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 LM3502ITL-35/NOPB reliable?
The price and inventory of LM3502ITL-35/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3502ITL-35/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITL-35/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITL-35/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITL-35/NOPB?
LM3502ITL-35/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITL-35/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 LM3502ITL-35/NOPB?
For technical support, including LM3502ITL-35/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITL-35/NOPB requirements.
6.How does Aetrix verify that LM3502ITL-35/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITL-35/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 LM3502ITL-35/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITL-35/NOPB?
All LM3502ITL-35/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITL-35/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 LM3502ITL-35/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITL-35/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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