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Texas Instruments LM3503ITLX-25/NOPB
- Part No.:
- LM3503ITLX-25/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3503ITLX-25/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,756
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Product details
Overview
LM3503ITLX-25/NOPB from Texas Instruments is a dual-display constant-current white LED driver IC with analog brightness control, 25 V over-voltage protection, 1 MHz switching frequency, and 2.5–5.5 V input range-designed for independent MAIN/SUB backlight control in portable dual-screen devices.
For engineers reviewing the LM3503ITLX-25/NOPB datasheet, LM3503ITLX-25/NOPB pinout, LM3503ITLX-25/NOPB application, or LM3503ITLX-25/NOPB equivalent, this page delivers verified package mapping (10-bump DSBGA), confirmed dual-FET switch architecture, OVP threshold (22.5–25.5 V), En1/En2 logic-level enable behavior, and real-world efficiency curves across LED count and current load.
Technical Context
The LM3503ITLX-25/NOPB implements an asynchronous current-mode PWM controller with dedicated NMOS (N1) and dual-path FET switches (PMOS P1 for MAIN, NMOS N2 for SUB), enabling independent regulation of two LED strings sharing a single inductor. Its feedback loop uses a 0.55 V typical reference voltage at the Fb pin, dynamically scaled by the Cntrl pin voltage (0.2–3.5 V).
Protection features include cycle-by-cycle current limiting (600 mA typ. for 25 V version), input under-voltage lockout (2.4–2.5 V turn-on), thermal shutdown, and output over-voltage protection triggered at 22.5–25.5 V-ensuring safe operation during LED open-circuit or string failure events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output OVP Threshold | 22.5–25.5 V - sets maximum allowable VOUT1 voltage to protect external diode/capacitor during LED string removal or failure |
| Switching Frequency | 0.8–1.2 MHz - enables compact LC filter design with <1 µH inductors and low-profile ceramic capacitors |
| Input Voltage Range | 2.5–5.5 V - supports direct connection to single-cell Li-ion (3.0–4.2 V) or regulated 3.3/5.0 V rails without pre-regulation |
| LED Current Control | Analog via 0.2–3.5 V on Cntrl pin - maps linearly to feedback voltage (VFb ≈ 0.156 × VCntrl), enabling precise dimming without PWM filtering |
| Current Limit (ICL) | 400–800 mA - peak NMOS switch current limit ensures safe inductor sizing and prevents thermal runaway under shorted-output conditions |
| Efficiency Peak | ≥80% - achieved at 15 mA per string with 4 LEDs total (2 MAIN + 2 SUB) and VIN = 3.6 V, minimizing battery drain in portable use |
| Enable Logic Thresholds | VEn1 ≥1.4 V turns MAIN ON; VEn2 ≥1.4 V turns SUB ON - allows independent display activation with standard GPIO levels |
Pinout & Package
LM3503ITLX-25/NOPB is housed in a 10-bump, 1.5 mm × 1.5 mm, 0.5 mm pitch, ultra-thin DSBGA package (YPA0010) with exposed die attach pad (DAP) for thermal dissipation. Pin assignments are bump-defined per TI SNVS329E Rev. May 2013.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input power supply connection | Accepts 2.5–5.5 V; requires local 4.7 µF ceramic capacitor to minimize high-frequency ripple and EMI |
| Sw | Drain of internal NMOS power switch (N1) | Connects to inductor and Schottky diode anode; trace must be short/wide to reduce switching losses and radiated noise |
| En1 | PMOS FET (P1) enable for MAIN display | Pull-down internal; ≥1.4 V enables MAIN string, ≤0.3 V disables it - used for main screen on/off sequencing |
| En2 | NMOS FET (N2) enable for SUB display | Pull-down internal; ≥1.4 V enables SUB string, ≤0.3 V disables it - used for sub-screen on/off sequencing |
| Fb | Feedback voltage sensing node | Monitors LED string voltage drop; internal 0.55 V reference sets current via external resistor network |
| Cntrl | Analog brightness control input | 0.2–3.5 V DC input scales VFb linearly (VFb = 0.156 × VCntrl); enables smooth analog dimming without flicker |
| AGND | Analog ground reference | Must be tied directly to PGND near device to avoid noise coupling into feedback path |
| PGND | Power ground return | High-current return path for Sw, VOUT1, VOUT2; connects to PCB ground plane under DAP for thermal relief |
| VOUT1 | OVP sense node & PMOS source (P1) | Connects to cathode of MAIN LED string and OVP circuitry; 25 V rating defines max safe output voltage |
| VOUT2 | NMOS drain (N2) & SUB string node | Connects to anode of SUB LED string; unused VOUT2 requires 100 nF bypass to PGND per datasheet guidance |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LED string control | Separate En1/En2 enables MAIN and SUB displays without external FETs or multiplexers - reduces BOM count and layout complexity |
| Integrated soft-start | Eliminates inrush current during startup by ramping current limit gradually - prevents input rail sag and system reset |
| No external compensation required | Stable operation across all LED counts (2–5 per string) and input voltages without loop compensation components - simplifies design validation |
| 100% duty cycle capability | Supports direct drive (no boost) when VIN > VLED string forward voltage - extends battery life in low-brightness or low-LED-count modes |
| Thermal shutdown protection | Shuts down NMOS switch N1 if junction temperature exceeds +150°C - prevents permanent damage during sustained overload or poor heatsinking |
Applications
| Cellular Phone Dual Display | PDA Main/Sub Backlight |
|---|---|
Use Scenario: Simultaneous illumination of front-facing main LCD and rear-facing secondary status display in clamshell or slider phones. IC Role / Device Role / Timing Role: Constant-current driver regulating two independent LED strings using shared inductor and single IC footprint. Use Value: Enables independent brightness control (via Cntrl pin) and on/off sequencing (via En1/En2) while maintaining <1 mm profile for thin form factors. |
Use Scenario: Powering primary touchscreen backlight and auxiliary keypad/status LED array in handheld PDAs. IC Role / Device Role / Timing Role: Dual-channel LED driver with analog dimming and fast enable/disable response for dynamic UI transitions. Use Value: Achieves >80% efficiency at 15 mA per string, extending runtime between charges without requiring discrete enable logic. |
| Portable Media Player UI | Industrial Handheld Terminal |
Use Scenario: Driving high-contrast main display and low-power indicator panel in MP3/video players with OLED/LCD hybrid interfaces. IC Role / Device Role / Timing Role: Analog-controlled current source delivering stable 10–20 mA per string across varying battery voltage (3.0–4.2 V). Use Value: Eliminates need for external PWM dimming circuitry - reduces component count and EMI from RC-filtered signals. |
Use Scenario: Illuminating ruggedized main display and status LED bar in warehouse scanners or field service terminals operating at −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Robust LED driver with −40°C to +125°C junction rating, UVP/OVP, and thermal shutdown for unattended operation. Use Value: Maintains consistent brightness across temperature extremes and survives brown-out conditions due to 2.4 V UVP turn-on threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-display LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3503ITLX-16/NOPB | 16 V OVP threshold; lower ICL (250–650 mA); identical pinout and control interface | Suitable for shorter LED strings (≤4 LEDs total) with lower forward voltage requirements | Select when VOUT1 < 16 V suffices and cost optimization is prioritized over headroom |
| LM3503ITLX-44/NOPB | 44 V OVP threshold; same ICL range (450–1050 mA); identical pinout and control interface | Required for longer LED strings (up to 10 LEDs total) or higher forward voltage designs (e.g., 3.5 V/LED × 10) | Select when driving ≥8 LEDs or operating in high-temperature environments where Vf drift increases total string voltage |
Compared with LM3503ITLX-16/NOPB and LM3503ITLX-44/NOPB, the LM3503ITLX-25/NOPB provides optimal OVP margin for mainstream 2×4 or 2×5 LED configurations (typical Vf = 3.2–3.4 V), balancing protection robustness against unnecessary voltage overhead that impacts efficiency.
Availability
LM3503ITLX-25/NOPB is available at Aetrix Electronics and suitable for portable consumer electronics, industrial handheld terminals, and medical diagnostic devices requiring stable component supply with guaranteed long-term availability and full RoHS compliance.
Supply support for LM3503ITLX-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 precision LED drivers and portable power solutions.
The LM3503 product line was engineered specifically for space-constrained dual-display backlighting in battery-powered devices, emphasizing ultra-thin packaging, analog dimming fidelity, and integrated protection to eliminate external safety components.
FAQ
What is the over-voltage protection threshold for LM3503ITLX-25/NOPB?
The LM3503ITLX-25/NOPB has a nominal over-voltage protection (OVP) threshold of 24 V, with guaranteed turn-off between 21.5–23 V and turn-on between 22.5–25.5 V. This 25 V rating is factory-trimmed and applies specifically to the VOUT1 pin, protecting the external Schottky diode and output capacitor during LED string open-circuit faults. The threshold is fixed and not user-adjustable.
Can LM3503ITLX-25/NOPB drive both MAIN and SUB displays simultaneously?
Yes, the LM3503ITLX-25/NOPB can drive both MAIN and SUB displays simultaneously. When En1 ≥1.4 V and En2 ≥1.4 V, the internal PMOS (P1) and NMOS (N2) switches conduct, routing current through both VOUT1→MAIN and VOUT2→SUB paths. The device regulates each string independently using shared feedback and current-sense architecture, supporting up to 5 LEDs per string.
What package type does LM3503ITLX-25/NOPB use, and is thermal pad soldering required?
The LM3503ITLX-25/NOPB uses a 10-bump, 1.5 mm × 1.5 mm, 0.5 mm pitch DSBGA package (TI designation YPA0010) with an exposed die attach pad (DAP). Soldering the DAP to the PCB ground plane is mandatory for thermal performance - TI specifies θJA = 65°C/W only when DAP is properly connected, and failure to do so risks thermal shutdown above 300 mW dissipation.
How does analog brightness control work on LM3503ITLX-25/NOPB?
Analog brightness control on the LM3503ITLX-25/NOPB operates via the Cntrl pin: applying 0.2–3.5 V sets the feedback reference voltage (VFb = 0.156 × VCntrl), which directly scales LED current. At VCntrl = 0 V, residual current remains (~0.5 mA); full dimming requires En1/En2 ≤0.3 V to enter shutdown. No external RC filter is needed, eliminating PWM-related flicker and EMI.
What is the minimum input voltage required for LM3503ITLX-25/NOPB to operate?
The LM3503ITLX-25/NOPB requires a minimum input voltage of 2.5 V to operate, with under-voltage protection disabling switching below 2.2–2.3 V (off-threshold) and re-enabling above 2.4–2.5 V (on-threshold). Below 2.5 V, the device enters shutdown mode drawing only 0.1–3 µA, preserving battery charge in deeply discharged states.
LM3503ITLX-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:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TµSMD (1.9x2.07)
LM3503ITLX-25/NOPB FAQ
1.How can I place an order for LM3503ITLX-25/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3503ITLX-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 LM3503ITLX-25/NOPB reliable?
The price and inventory of LM3503ITLX-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 LM3503ITLX-25/NOPB is usually 5 days.
3.What payment methods are accepted for LM3503ITLX-25/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3503ITLX-25/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3503ITLX-25/NOPB?
LM3503ITLX-25/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3503ITLX-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 LM3503ITLX-25/NOPB?
For technical support, including LM3503ITLX-25/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3503ITLX-25/NOPB requirements.
6.How does Aetrix verify that LM3503ITLX-25/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3503ITLX-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 LM3503ITLX-25/NOPB meets industry standards.
7.What is the process for return or replacement of LM3503ITLX-25/NOPB?
All LM3503ITLX-25/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3503ITLX-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 LM3503ITLX-25/NOPB part is unused and in its original packaging.
Return procedure for LM3503ITLX-25/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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