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Texas Instruments LM3503ITL-35/NOPB
- Part No.:
- LM3503ITL-35/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3503ITL-35/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3503ITL-35/NOPB from Texas Instruments is a dual-display constant-current white LED driver IC with analog brightness control, 35 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 LM3503ITL-35/NOPB datasheet, LM3503ITL-35/NOPB pinout, LM3503ITL-35/NOPB application, or LM3503ITL-35/NOPB equivalent, this page delivers verified package mapping (10-bump DSBGA), confirmed dual-FET switch architecture, OVP threshold (32–35 V), analog dimming interface (Cntrl pin), and real-world dual-LED-string timing behavior per TI SNVS329E Rev. May 2013.
Technical Context
The LM3503ITL-35/NOPB implements an asynchronous current-mode PWM boost controller with two integrated FET switches: a PMOS (P1) at VOUT1 for MAIN display control and an NMOS (N2) at VOUT2 for SUB display control. It uses cycle-by-cycle current limiting, dedicated UVP (2.4–2.5 V turn-on), and programmable OVP (32–35 V) to protect against open-circuit LED faults.
Its analog brightness control operates via Cntrl pin voltage (0.2–3.5 V), which linearly sets feedback reference (VFb = 0.156 × VCntrl), enabling precise DC dimming without external DACs. Soft-start eliminates inrush current, and thermal shutdown activates above +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output OVP Threshold | 32.0–35.0 V (enables safe operation with 35 V-rated output capacitors and prevents damage during LED string open-circuit) |
| Switching Frequency | 0.8–1.2 MHz (fixed-frequency operation enables predictable EMI filtering and compact external component selection) |
| Input Voltage Range | 2.5–5.5 V (supports single-cell Li-ion, Li-polymer, and regulated 3.3 V/5 V rails without pre-regulation) |
| Feedback Reference | 0.5–0.6 V (tight tolerance ensures stable LED current regulation across temperature and load variations) |
| Peak Efficiency | >80% (achieved at typical loads of 2–5 LEDs per string, minimizing thermal stress in space-constrained handhelds) |
| Junction Temp Range | −40°C to +125°C (guarantees reliable operation in extended-temperature portable and industrial displays) |
| Quiescent Current | 0.1–3 µA in shutdown mode (critical for battery life preservation when displays are inactive) |
Pinout & Package
LM3503ITL-35/NOPB uses a 10-bump thin DSBGA package (YPA0010), height <1 mm, optimized for ultra-thin portable designs. Thermal performance: θJA = 65°C/W.
| 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 input ripple and EMI |
| Sw | Drain of internal NMOS power switch (N1) | Connects to boost inductor; trace must be short/wide to reduce switching losses and radiated noise |
| En1 | PMOS FET (P1) enable for MAIN display | Logic-high (≥1.4 V) disables MAIN segment; internal pull-down keeps MAIN off by default |
| En2 | NMOS FET (N2) enable for SUB display | Logic-high (≥1.4 V) disables SUB segment; floating or grounded if VOUT2 unused |
| Fb | Feedback voltage sensing node | Monitors regulated output; connects to resistor divider from VOUT2 to set LED current |
| Cntrl | Analog brightness control input | 0.2–3.5 V DC input scales VFb linearly; RC-filtered PWM also supported |
| AGND | Analog ground reference | Must be tied directly to PGND to prevent noise coupling into feedback path |
| PGND | Power ground return | Low-impedance connection to PCB ground plane; die attach pad (DAP) soldered to GND for thermal relief |
| VOUT1 | OVP sense node & PMOS source (P1) | Connects to MAIN LED string anode; OVP comparator monitors this pin for 32–35 V fault condition |
| VOUT2 | Drain of NMOS bypass FET (N2) & SUB string cathode | Used only when SUB display active; 100 nF capacitor required if unused (per TI SNVS329E p.2) |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LED string control | Separate En1/En2 logic enables MAIN-only, SUB-only, or both-on states-no external multiplexers needed |
| Programmable 35 V over-voltage protection | Hardware-enforced OVP threshold prevents catastrophic failure during LED open-circuit or disconnection |
| Analog + PWM brightness control | Cntrl pin accepts DC voltage or filtered PWM (≥10× RC bandwidth); supports flicker-free dimming down to 0.1 mA |
| Integrated soft-start | Gradually ramps current limit at startup to eliminate inrush current spikes that could destabilize supply rails |
| Ultra-low profile packaging | 10-bump DSBGA (1.5 × 1.5 mm, <1 mm height) fits beneath narrow bezels in smartphones and PDAs |
| Thermal shutdown protection | Automatically disables switching above +150°C junction temperature, preventing permanent silicon damage |
Applications
| Smartphone Dual Display | PDA Main/Sub Backlight |
|---|---|
Use Scenario: Simultaneous illumination of front-facing status display and main LCD in clamshell or slider phones. IC Role / Device Role / Timing Role: LM3503ITL-35/NOPB independently regulates MAIN (VOUT1) and SUB (VOUT2) strings using En1/En2 logic, enabling dynamic on/off sequencing without MCU intervention. Use Value: Eliminates need for two discrete LED drivers; reduces BOM count and PCB area while maintaining 35 V OVP safety margin for variable LED forward voltage stacks. |
Use Scenario: Powering high-contrast monochrome main screen and low-power secondary status panel in legacy PDAs. IC Role / Device Role / Timing Role: LM3503ITL-35/NOPB acts as dual-channel constant-current source, with Cntrl pin enabling synchronized analog dimming across both displays from a single DAC output. Use Value: Achieves >80% efficiency at 15 mA per string, extending battery runtime; 1 MHz switching allows use of 2.2 µH inductors under 1 mm height. |
| Portable Medical Monitor UI | Industrial Handheld Terminal |
Use Scenario: Driving primary diagnostic display and auxiliary alert indicator panel in battery-powered medical devices requiring Class II isolation. IC Role / Device Role / Timing Role: LM3503ITL-35/NOPB provides isolated current regulation for each display segment, with UVP (2.4 V) ensuring graceful shutdown before Li-ion cell depletion. Use Value: Guaranteed −40°C to +125°C operation supports sterilization cycles and cold-storage deployment; DSBGA package withstands mechanical shock in mobile diagnostics. |
Use Scenario: Illuminating ruggedized main LCD and keypad backlight in warehouse scanners exposed to wide ambient temperatures. IC Role / Device Role / Timing Role: LM3503ITL-35/NOPB delivers stable 20 mA per string despite 2.5–5.5 V input variation from aging batteries or USB power sources. Use Value: 35 V OVP protects against transient overvoltage during hot-plug events; PGND/AGND separation minimizes noise coupling in noisy industrial environments. |
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 |
|---|---|---|---|
| LM3503ITL-44/NOPB | Higher OVP threshold (40.5–43.5 V); identical pinout, package, and control logic | Required for 44 V-rated LED strings or systems with higher output capacitance/voltage transients | Select when system-level OVP margin must exceed 35 V; no layout change needed |
| TPS61165DRVR | Single-output, 40 V OVP, I²C interface, no dual-string enable logic | Lacks En1/En2 hardware control; requires MCU firmware to manage dual-display sequencing | Choose for I²C-configurable brightness and fault reporting where software control is acceptable |
Compared with LM3503ITL-44/NOPB, the LM3503ITL-35/NOPB offers tighter OVP clamping for cost-sensitive 35 V LED stacks, while TPS61165DRVR trades hardware dual-control for digital configurability-making LM3503ITL-35/NOPB optimal for deterministic, low-latency dual-display timing without MCU overhead.
Availability
LM3503ITL-35/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, PDA dual-display systems, portable medical UIs, and industrial handheld terminals requiring stable component supply and long-term manufacturability.
Supply support for LM3503ITL-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 expertise in precision power conversion and LED lighting solutions.
The LM3503 product line was engineered specifically for dual-display portable electronics, delivering integrated dual-FET switching, analog dimming, and robust protection in sub-1 mm packages to meet stringent space and reliability demands.
FAQ
What is the exact over-voltage protection threshold for LM3503ITL-35/NOPB?
The LM3503ITL-35/NOPB has a guaranteed OVP turn-on threshold of 32.0–35.0 V and turn-off threshold of 31.0–34.0 V, as specified in TI SNVS329E Rev. May 2013 Table 1. This 35 V rating applies exclusively to the VOUT1 pin and is factory-trimmed-no external components affect this value. The LM3503ITL-35/NOPB enters shutdown when VOUT1 exceeds the upper threshold, protecting downstream LEDs and capacitors.
Can LM3503ITL-35/NOPB drive both MAIN and SUB displays simultaneously?
Yes, LM3503ITL-35/NOPB can drive both MAIN and SUB displays concurrently. When En1 ≥1.4 V and En2 ≥1.4 V, the internal PMOS (P1) and NMOS (N2) FETs are both disabled, allowing current to flow through both LED strings-MAIN from VOUT1 to VOUT2, and SUB from VOUT2 to Fb. This configuration is explicitly validated in TI's Figure 4 operational table and requires no additional logic circuitry.
What package type does LM3503ITL-35/NOPB use, and is it RoHS-compliant?
LM3503ITL-35/NOPB uses a 10-bump thin DSBGA package (YPA0010, 1.5 × 1.5 mm, <1 mm height) with NiPdAu bump finish. Per TI's official documentation and part marking, LM3503ITL-35/NOPB is RoHS-compliant and lead-free, with "NOPB" suffix confirming exemption from lead-based finishes. The die attach pad (DAP) must be soldered to the PCB ground plane for thermal and electrical integrity.
How does analog brightness control work on LM3503ITL-35/NOPB?
LM3503ITL-35/NOPB implements analog brightness control via the Cntrl pin: VFb = 0.156 × VCntrl, where VCntrl ranges from 0.2 V to 3.5 V. This linear relationship directly scales the feedback reference, adjusting LED current without changing switching frequency or introducing PWM artifacts. The LM3503ITL-35/NOPB maintains regulation accuracy across temperature, as confirmed by TI's Figure 21–22 performance curves.
Is LM3503ITL-35/NOPB pin-compatible with other LM3503 variants?
Yes, LM3503ITL-35/NOPB shares identical pinout and package (10-bump DSBGA) with LM3503ITL-16/NOPB, LM3503ITL-25/NOPB, and LM3503ITL-44/NOPB. All variants use the same YPA0010 footprint and bump assignment per TI SNVS329E Figure 1. OVP threshold differences are internal and do not affect PCB layout-only the BOM and functional validation need updating when substituting between versions.
LM3503ITL-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:
- 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)
LM3503ITL-35/NOPB FAQ
1.How can I place an order for LM3503ITL-35/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3503ITL-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 LM3503ITL-35/NOPB reliable?
The price and inventory of LM3503ITL-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 LM3503ITL-35/NOPB is usually 5 days.
3.What payment methods are accepted for LM3503ITL-35/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3503ITL-35/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3503ITL-35/NOPB?
LM3503ITL-35/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3503ITL-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 LM3503ITL-35/NOPB?
For technical support, including LM3503ITL-35/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3503ITL-35/NOPB requirements.
6.How does Aetrix verify that LM3503ITL-35/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3503ITL-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 LM3503ITL-35/NOPB meets industry standards.
7.What is the process for return or replacement of LM3503ITL-35/NOPB?
All LM3503ITL-35/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3503ITL-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 LM3503ITL-35/NOPB part is unused and in its original packaging.
Return procedure for LM3503ITL-35/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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