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Texas Instruments LM3502ITLX-25/NOPB
- Part No.:
- LM3502ITLX-25/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITLX-25/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,632
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Product details
Overview
LM3502ITLX-25/NOPB from Texas Instruments is a 25V-output, asynchronous current-mode step-up white LED driver IC for dual-display backlighting. It integrates dual internal FET switches (PMOS and NMOS), operates from 2.5V–5.5V input, delivers >80% efficiency at 1 MHz fixed switching frequency, and supports PWM dimming without external RC filtering - used in portable device main/sub display backlight control.
For engineers reviewing the LM3502ITLX-25/NOPB datasheet, LM3502ITLX-25/NOPB pinout, LM3502ITLX-25/NOPB application, or LM3502ITLX-25/NOPB equivalent, key selection criteria include its 25V OVP threshold, dual independent enable logic (En1/En2), integrated soft-start, under-voltage protection, and DSBGA-10 package compatibility with space-constrained handheld designs.
Technical Context
The LM3502ITLX-25/NOPB implements an asynchronous current-mode PWM control architecture with cycle-by-cycle current limiting and dedicated over-voltage protection (OVP on/off thresholds at 22.5V/21.5V). Its internal power NMOS switch (N1) features RDS(ON) ≤1.1 Ω, while the PMOS (P1) and NMOS (N2) bypass FETs support independent MAIN/SUB LED string control via En1 and En2 pins.
It includes analog ground (AGND) and power ground (PGND) separation, internal 0.25V feedback reference, and shutdown logic with 12 ms typical delay. The device enters low-IQ shutdown (6–15 µA) when Cntrl ≥1.4V and both En1/En2 ≤0.3V, disabling all internal FETs while preserving output diode bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 25 V nominal; OVP triggers at 22.5–25.5 V, protecting against open-string failure |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with single Li-ion or 3×NiMH battery supplies |
| Switching Frequency | 1 MHz ±20%; enables compact 22 µH inductor and low-ESR ceramic output capacitor use |
| Feedback Voltage | 0.25 V typical; sets LED current via external resistor (ILED = 0.25 V / RSET) |
| Current Limit | 600 mA typical (at Fb = 0 V); limits peak inductor current to prevent thermal stress |
| Quiescent Current | 1.9–3 mA during switching; 0.1–3 µA in shutdown; critical for standby battery life |
| Efficiency | >80% typical at 5.5 V input driving 10 LEDs; reduces thermal load in thin form factors |
Pinout & Package
LM3502ITLX-25/NOPB uses a 10-bump, 0.5 mm pitch, low-profile (<1 mm height) Thin DSBGA package (Package Number YPA0010), optimized for portable PCB stacking and thermal dissipation via soldered die attach pad (DAP).
| 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 |
| Sw | Power NMOS drain | Drives external inductor; minimize trace length/width to reduce EMI and conduction loss |
| En1 | MAIN display FET control | ≤0.3 V enables MAIN LED string; ≥1.4 V disables it; internal pull-down defaults to ON |
| En2 | SUB display FET control | ≤0.3 V enables SUB LED string; ≥1.4 V disables it; internal pull-down defaults to ON |
| Fb | Current-sense feedback | 0.25 V reference node; connects to current-set resistor to ground for precise ILED programming |
| Cntrl | Global enable/shutdown | ≥1.4 V enables operation; ≤0.3 V forces shutdown; supports PWM dimming directly |
| AGND | Analog reference ground | Must tie directly to PGND near device to avoid noise coupling into feedback path |
| PGND | Power return path | High-current return for Sw, VOUT1, VOUT2; connect to solid ground plane under DAP |
| VOUT1 | OVP sense & PMOS source | Connects to Schottky diode anode and output capacitor; OVP monitors this node |
| VOUT2 | NMOS/PMOS drain junction | Used only when splitting LED string between MAIN and SUB; otherwise ground En2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | Separate En1/En2 pins allow MAIN and SUB LED strings to be enabled/disabled independently without external logic |
| PWM dimming without RC filter | Internal circuitry accepts direct 200–500 Hz PWM on Cntrl pin, eliminating external filtering components and startup delay |
| Integrated protection suite | Includes UVP (2.4 V trip), OVP (22.5 V on-threshold), thermal shutdown, and cycle-by-cycle current limit |
| Low-profile DSBGA packaging | 10-bump, <1 mm height package enables ultra-thin portable designs with enhanced thermal transfer via DAP soldering |
| No external compensation required | Stable operation with minimal external parts: only input/output capacitors, inductor, Schottky diode, and current-set resistor |
Applications
| Cellular Phone Dual Display | Tablet Main/Sub Backlight |
|---|---|
Use Scenario: Simultaneous illumination of front-facing status display and rear main LCD in clamshell or slider phones. IC Role / Device Role / Timing Role: LM3502ITLX-25/NOPB acts as dual-channel boost controller, regulating current through two physically separate white LED strings using En1/En2 logic. Use Value: Enables independent brightness control and power gating per display, extending battery runtime by disabling unused segments. | Use Scenario: Powering high-resolution main LCD and auxiliary touch-sensitive control panel in compact tablets. IC Role / Device Role / Timing Role: LM3502ITLX-25/NOPB provides 25 V regulated boost output with fast transient response to PWM dimming commands across both displays. Use Value: Delivers >80% efficiency at 1 MHz, minimizing heat generation in thermally constrained tablet chassis. |
| PDA Keypad + Screen Backlight | Portable Media Player UI Lighting |
Use Scenario: Illuminating alphanumeric keypad and primary TFT screen in legacy PDAs with tight board area budgets. IC Role / Device Role / Timing Role: LM3502ITLX-25/NOPB serves as single-chip dual-output LED driver, using VOUT1/VOUT2 nodes to split one LED string into two functional zones. Use Value: Eliminates need for second boost converter or discrete FETs, reducing BOM count and PCB footprint by >35%. | Use Scenario: Driving segmented OLED or white LED indicators alongside main display in audio-focused portable media players. IC Role / Device Role / Timing Role: LM3502ITLX-25/NOPB functions as programmable current source with analog-dimming capability via Fb resistor and digital dimming via Cntrl pin. Use Value: Supports smooth 100:1 brightness range using combined analog/digital dimming, avoiding audible coil whine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3502ITLX-16/NOPB | 16 V OVP threshold; lower current limit (400 mA typ); identical pinout and control logic | Suitable for shorter LED strings (≤4 LEDs) or lower-voltage systems where 25 V headroom is unnecessary | Select when output voltage margin can be reduced to optimize efficiency and thermal performance |
| LM3502ITLX-35/NOPB | 35 V OVP threshold; higher current limit (750 mA typ); same DSBGA-10 package and interface | Required for longer LED strings (≥8 LEDs) or higher forward-voltage configurations (e.g., high-CCT LEDs) | Choose when system-level VF sum exceeds 22 V and 25 V OVP margin is insufficient |
Compared with LM3502ITLX-16/NOPB and LM3502ITLX-35/NOPB, the LM3502ITLX-25/NOPB offers optimal voltage headroom for 6–8 white LED strings at typical forward voltages (3.0–3.6 V), balancing OVP safety margin, efficiency, and thermal dissipation in mainstream handheld backlight designs.
Availability
LM3502ITLX-25/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, portable media player UI lighting, PDA keypad illumination, and tablet dual-display applications requiring stable component supply and long-term production continuity.
Supply support for LM3502ITLX-25/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 portable power conversion and LED driver innovation.
The LM3502 product line was designed specifically for space-constrained dual-display backlighting in battery-powered consumer electronics, integrating dual FET control, high-efficiency boost conversion, and robust protection in ultra-low-profile packages.
FAQ
What is the over-voltage protection (OVP) threshold for LM3502ITLX-25/NOPB?
The LM3502ITLX-25/NOPB has an OVP on-threshold of 22.5 V to 25.5 V and an off-threshold of 21.5 V to 24.5 V, calibrated for 25 V nominal output. This protects against LED string open-circuit faults by halting switching when VOUT1 exceeds the upper threshold, ensuring safe operation without external clamping components.
How does LM3502ITLX-25/NOPB support dual-display backlight control?
The LM3502ITLX-25/NOPB supports dual-display control via dedicated En1 and En2 pins that independently gate internal PMOS (P1) and NMOS (N2) FETs. When En1 ≤0.3 V, the MAIN LED string (between VOUT1 and VOUT2) illuminates; when En2 ≤0.3 V, the SUB string (between VOUT2 and Fb) illuminates - enabling flexible segment power management in a single IC.
Can LM3502ITLX-25/NOPB be dimmed using PWM without external filtering?
Yes, LM3502ITLX-25/NOPB accepts direct PWM signals on the Cntrl pin across 200–500 Hz without requiring external RC filters. Its internal circuitry maintains soft-start state during short low pulses (<12 ms), enabling fast, flicker-free dimming while preserving regulation stability and avoiding inrush current on each PWM edge.
What package type and thermal characteristics does LM3502ITLX-25/NOPB use?
LM3502ITLX-25/NOPB uses a 10-bump Thin DSBGA package (YPA0010) with a soldered die attach pad (DAP) for thermal conduction. Its junction-to-ambient thermal resistance (θJA) is 65°C/W, enabling reliable operation up to +125°C junction temperature when mounted on a 2-layer PCB with adequate copper pour under the DAP.
What is the recommended current-setting resistor value for 20 mA LED current with LM3502ITLX-25/NOPB?
Using the LM3502ITLX-25/NOPB's 0.25 V feedback reference, a 12.5 Ω resistor (RSET = 0.25 V / 0.02 A) sets 20 mA LED current. Standard 1% tolerance metal-film or thick-film resistors are recommended; place RSET close to the Fb pin and AGND to minimize noise coupling into the current-sense path.
LM3502ITLX-25/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:
- 25V
- Current - Output / Channel:
- 600mA (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-25/NOPB FAQ
1.How can I place an order for LM3502ITLX-25/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITLX-25/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-25/NOPB reliable?
The price and inventory of LM3502ITLX-25/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-25/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITLX-25/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITLX-25/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITLX-25/NOPB?
LM3502ITLX-25/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITLX-25/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-25/NOPB?
For technical support, including LM3502ITLX-25/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITLX-25/NOPB requirements.
6.How does Aetrix verify that LM3502ITLX-25/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITLX-25/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-25/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITLX-25/NOPB?
All LM3502ITLX-25/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITLX-25/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-25/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITLX-25/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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