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Texas Instruments LM3502ITL-25/NOPB
- Part No.:
- LM3502ITL-25/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITL-25/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:1,978
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Product details
Overview
LM3502ITL-25/NOPB from Texas Instruments is a 25 V-output, asynchronous current-mode step-up DC/DC converter optimized for dual white LED backlighting in portable displays. It integrates dual internal FET switches (PMOS and NMOS) for independent MAIN/SUB display control, delivers >80% efficiency at 5.5 V input and 20 mA LED current, and operates with 1 MHz fixed switching frequency across 2.5–5.5 V input range.
For engineers reviewing the LM3502ITL-25/NOPB datasheet, LM3502ITL-25/NOPB pinout, LM3502ITL-25/NOPB application, or LM3502ITL-25/NOPB equivalent, key selection criteria include output voltage rating (25 V), dual-display enable logic (En1/En2 thresholds), feedback reference (0.25 V), over-voltage protection thresholds (22.5–25.5 V), and thermal performance in the 10-bump DSBGA package.
Technical Context
The LM3502ITL-25/NOPB implements an asynchronous PWM boost architecture with cycle-by-cycle current limiting, internal soft-start, and dedicated UVP/OVP comparators. Its dual-FET topology enables independent MAIN (VOUT1–VOUT2) and SUB (VOUT2–Fb) LED string control via En1 and En2 pins with defined 0.3 V / 1.4 V logic thresholds.
It features no external compensation requirement, integrated 1 MHz oscillator, and light-load pulse-frequency modulation (PFM) mode to maintain regulation at low currents. Protection functions include thermal shutdown, over-current limit (600 mA typ. for -25 variant), and input under-voltage lockout (2.4–2.5 V turn-on).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 25 V nominal; OVP threshold 22.5–25.5 V ensures safe operation with open-string or LED failure conditions. |
| 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 without external LDO. |
| Switching Frequency | 1 MHz ±20%; enables use of small 2.2 µH inductors and reduces EMI filtering burden in space-constrained portable designs. |
| Feedback Reference | 0.25 V typical; sets LED current via external resistor (e.g., 12.5 Ω for 20 mA), minimizing power loss in current-sense network. |
| Current Limit | 600 mA typical at 25 V option; protects internal NMOS switch (N1) during startup or short-circuit events without external sensing. |
| Quiescent Current | 1 µA shutdown, 1 mA non-switching, 3 mA switching; extends battery life in always-on display standby modes. |
| Efficiency | >80% at 5.5 V input, 20 mA LED load; achieved via low RDS(ON) (0.55 Ω NMOS, 5 Ω PMOS) and synchronous-free architecture. |
Pinout & Package
LM3502ITL-25/NOPB uses a 10-bump thin DSBGA package (0.9 mm height, 1.5 mm × 1.5 mm footprint) with die attach pad (DAP) requiring solder connection to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.5–5.5 V; requires 4.7 µF ceramic capacitor placed adjacent to pin to minimize high-frequency ripple and EMI. |
| Sw | Power NMOS drain node | Connects to inductor and Schottky diode anode; trace must be short/wide to reduce switching losses and radiated noise. |
| En1 | MAIN display FET enable | ≤0.3 V turns on PMOS (P1), disabling MAIN string; ≥1.4 V disables P1, enabling MAIN-internal pull-down defaults to OFF. |
| En2 | SUB display FET enable | ≤0.3 V turns on NMOS (N2), disabling SUB string; ≥1.4 V disables N2, enabling SUB-internal pull-down defaults to OFF. |
| Fb | Current-sense feedback node | 0.25 V reference; connects to current-setting resistor to ground; determines LED current with <1% tolerance over temp. |
| Cntrl | Global enable/shutdown control | ≥1.4 V enables device; ≤0.3 V forces shutdown; internal pull-down ensures default OFF state for safety. |
| AGND | Analog ground reference | Must be tied directly to PGND; separates noise-sensitive feedback path from high-current power return. |
| PGND | Power ground return | High-current return for Sw, VOUT1, VOUT2; requires low-impedance connection to PCB ground plane. |
| VOUT1 | MAIN string output / OVP sense | Drain of PMOS (P1); connects to cathode of MAIN LED string; also senses output for 22.5–25.5 V OVP trip. |
| VOUT2 | SUB string output / FET junction | Drain of both PMOS (P1) and NMOS (N2); connects to cathode of SUB LED string or unused (must tie En2 to GND if unused). |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | Separate En1/En2 logic enables MAIN and SUB LED strings independently-no external FETs or logic required for dual-backlight systems. |
| Integrated OVP/UVP protection | OVP thresholds (22.5–25.5 V) and UVP (2.4–2.5 V) operate autonomously without external components, preventing damage during fault conditions. |
| PWM dimming without RC filter | Direct Cntrl-pin PWM interface accepts 200–500 Hz signals with no external RC network-reduces BOM count and board area. |
| Low-profile DSBGA package | 10-bump, 1.5 mm × 1.5 mm, <0.9 mm height-meets ultra-thin mobile design requirements while enabling efficient thermal dissipation via DAP. |
| No external compensation | Stable operation with only input/output capacitors and inductor-eliminates tuning effort and reduces design cycle time. |
Applications
| Cellular Phone Dual Display | PDA Main + Secondary Screen |
|---|---|
Use Scenario: Simultaneous backlighting of main LCD and secondary status OLED in compact handheld devices. IC Role / Device Role / Timing Role: LM3502ITL-25/NOPB acts as dual-output boost controller, regulating two independent LED strings with precise current matching. Use Value: Enables dynamic brightness control per display using En1/En2 logic, reducing system power by 30% vs. single-string solutions with external switching. |
Use Scenario: Backlight management for primary touchscreen and auxiliary keypad or notification display in legacy PDAs. IC Role / Device Role / Timing Role: LM3502ITL-25/NOPB serves as integrated LED driver with hardware-enforced sequencing-En1 asserts before En2 to avoid current surge. Use Value: Eliminates need for discrete enable logic and dual boost ICs, cutting component count by 40% and PCB area by 25 mm². |
| Portable Media Player UI + Panel | Smartwatch Dual-Mode Display |
Use Scenario: Powering high-brightness front panel icons and low-power segmented LCD in media players with variable content. IC Role / Device Role / Timing Role: LM3502ITL-25/NOPB provides MAIN string for UI LEDs and SUB string for panel backlight, controlled via microcontroller GPIOs. Use Value: Achieves 200:1 dimming ratio using combined PWM (Cntrl) and analog enable (En1/En2), extending battery runtime by 18% in mixed-use modes. |
Use Scenario: Driving always-on segment display and on-demand full-color OLED in wearables with strict height constraints. IC Role / Device Role / Timing Role: LM3502ITL-25/NOPB functions as ultra-low-profile boost driver with thermal-aware duty limiting-DAP grounding maintains <125°C junction temp. Use Value: Supports 0.9 mm total stack height while delivering 25 V at 15 mA per string, meeting IP68 mechanical sealing requirements. |
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 |
|---|---|---|---|
| LM3502ITL-16/NOPB | 16 V output rating; lower OVP threshold (14.5–16.5 V); identical pinout and control logic. | Suitable for shorter LED strings (≤4 LEDs @ 3.2 V) where 25 V headroom is unnecessary. | Select when driving ≤4 white LEDs to reduce output capacitance size and improve light-load efficiency. |
| TPS61165DRVR | 28 V output; I²C programmable current; 1.2 MHz switching; WQFN-16 package (larger footprint). | Requires external I²C host and additional decoupling; supports dynamic current adjustment but adds firmware overhead. | Choose when system-level brightness calibration or multi-string current profiling is required beyond fixed dual-enable logic. |
Compared with LM3502ITL-16/NOPB, the LM3502ITL-25/NOPB provides higher output headroom for longer LED strings, while TPS61165DRVR offers digital configurability at the cost of increased layout complexity and software integration effort.
Availability
LM3502ITL-25/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 and long-term production continuity.
Supply support for LM3502ITL-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 and embedded processing technologies, with decades of expertise in power management ICs for portable electronics.
The LM3502 product line was designed specifically for dual-display white LED backlighting in space- and power-constrained portable devices, integrating dual-FET control, robust protection, and minimal external component count.
FAQ
What is the maximum LED string voltage supported by LM3502ITL-25/NOPB?
The LM3502ITL-25/NOPB is rated for 25 V output with over-voltage protection triggering between 22.5 V and 25.5 V. This supports up to eight 3.2 V white LEDs in series (25.6 V theoretical), though design margin recommends limiting to seven LEDs (22.4 V) for reliable OVP margin and thermal stability under worst-case conditions.
How does LM3502ITL-25/NOPB handle dual-display enable sequencing?
The LM3502ITL-25/NOPB uses separate En1 and En2 pins with defined 0.3 V / 1.4 V logic thresholds to independently control MAIN (VOUT1–VOUT2) and SUB (VOUT2–Fb) LED strings. En1 enables MAIN by turning off the internal PMOS (P1); En2 enables SUB by turning off the internal NMOS (N2). Both pins feature internal pull-down resistors, ensuring default OFF states.
Can LM3502ITL-25/NOPB be used with a single LED string?
Yes, LM3502ITL-25/NOPB supports single-string operation: connect the full LED string between VOUT1 and Fb, ground En2, and control brightness solely via Cntrl-pin PWM or En1 logic. The unused VOUT2 node must remain unconnected or tied to Fb through a small capacitor if noise sensitivity is a concern.
What thermal considerations apply to LM3502ITL-25/NOPB in the DSBGA package?
LM3502ITL-25/NOPB in the 10-bump DSBGA package has a junction-to-ambient thermal resistance (θJA) of 65°C/W. To maintain TJ ≤125°C at 85°C ambient, power dissipation must stay below 615 mW. This requires proper DAP soldering to a ≥100 mm² ground plane and minimizing trace resistance on PGND/VOUT1 paths.
Does LM3502ITL-25/NOPB require external compensation components?
No, LM3502ITL-25/NOPB is internally compensated and operates stably with only the required external components: input capacitor (4.7 µF), output capacitor (1 µF), inductor (22 µH), Schottky diode, and current-set resistor. No external compensation network is needed, simplifying layout and eliminating tuning iterations.
LM3502ITL-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)
LM3502ITL-25/NOPB FAQ
1.How can I place an order for LM3502ITL-25/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITL-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 LM3502ITL-25/NOPB reliable?
The price and inventory of LM3502ITL-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 LM3502ITL-25/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITL-25/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITL-25/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITL-25/NOPB?
LM3502ITL-25/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITL-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 LM3502ITL-25/NOPB?
For technical support, including LM3502ITL-25/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITL-25/NOPB requirements.
6.How does Aetrix verify that LM3502ITL-25/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITL-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 LM3502ITL-25/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITL-25/NOPB?
All LM3502ITL-25/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITL-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 LM3502ITL-25/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITL-25/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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