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Texas Instruments LM3502ITL-44/NOPB
- Part No.:
- LM3502ITL-44/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITL-44/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:1,309
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Product details
Overview
LM3502ITL-44/NOPB from Texas Instruments is a 44 V-output, asynchronous current-mode step-up DC/DC converter optimized for dual white LED backlighting. It integrates dual internal FET switches (PMOS and NMOS), supports 2–5 LEDs per display segment, operates from 2.5 V to 5.5 V input, delivers >80% efficiency at 1 MHz fixed switching frequency, and enables independent MAIN/SUB display control via En1/En2 pins in portable electronics.
For engineers reviewing the LM3502ITL-44/NOPB datasheet, LM3502ITL-44/NOPB pinout, LM3502ITL-44/NOPB application, or LM3502ITL-44/NOPB equivalent, key selection criteria include output voltage rating (44 V), dual-FET bypass architecture, OVP thresholds (40.5–43.5 V), feedback reference (0.25 V), and thermal performance (θJA = 65°C/W in DSBGA).
Technical Context
The LM3502ITL-44/NOPB implements an asynchronous current-mode PWM control scheme with cycle-by-cycle current limiting, over-voltage protection (OVP) set at 40.5–43.5 V, and under-voltage protection (UVP) at 2.4–2.5 V. Its internal architecture includes dedicated error amplifiers, light-load PFM mode, soft-start circuitry, and dual independent enable logic for MAIN (En1) and SUB (En2) LED segments.
It features two integrated power switches: a PMOS (RDS(ON) = 5–10 Ω) controlling the MAIN segment between VOUT1 and VOUT2, and an NMOS (RDS(ON) = 2.5–5 Ω) controlling the SUB segment between VOUT2 and Fb - both driven by logic-level inputs with 0.3 V / 1.4 V thresholds and internal pull-downs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 44 V nominal; OVP threshold 40.5–43.5 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 (2.4–3.2 V) supplies. |
| Switching Frequency | 1 MHz ±20%; enables compact external components (e.g., 22 µH inductor, 1 µF ceramic output cap). |
| Feedback Reference | 0.25 V typical; sets LED current via external resistor R1 = 0.25 V / ILED, enabling precise analog dimming. |
| Efficiency | >80% typical at full load; achieved via low RDS(ON) FETs and minimized gate drive losses. |
| Thermal Resistance | θJA = 65°C/W (DSBGA); requires DAP soldered to PCB ground plane for reliable operation at 125°C junction. |
| Shutdown Current | 0.1–3 µA; ultra-low quiescent draw in shutdown mode preserves battery life in portable devices. |
Pinout & Package
LM3502ITL-44/NOPB uses a 10-bump thin DSBGA package (package code YPA0010), height <1 mm, with die attach pad (DAP) requiring connection to PCB ground plane for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Supply input | Connects to 2.5–5.5 V source; requires 4.7 µF ceramic capacitor placed adjacent to pin. |
| Sw | Power NMOS drain | Drain of main switching FET (N1); minimize trace length/width to reduce EMI and conduction loss. |
| En1 | MAIN display enable | Controls PMOS switch (P1); ≤0.3 V turns MAIN ON, ≥1.4 V turns MAIN OFF; internal pull-down defaults to ON. |
| En2 | SUB display enable | Controls NMOS switch (N2); ≤0.3 V turns SUB ON, ≥1.4 V turns SUB OFF; internal pull-down defaults to ON. |
| Fb | Current sense feedback | 0.25 V reference node; connects to current-setting resistor to ground for LED current programming. |
| Cntrl | Global enable/shutdown | ≥1.4 V enables device; ≤0.3 V forces shutdown; internal pull-down keeps device OFF by default. |
| AGND | Analog ground | Must be tied directly to PGND to avoid noise coupling into feedback path. |
| PGND | Power ground | High-current return path for Sw, VOUT1, VOUT2; connect directly to PCB ground plane. |
| VOUT1 | OVP sensing / PMOS source | Output node for MAIN segment; also senses OVP; connect Schottky diode and output cap here. |
| VOUT2 | NMOS/PMOS drain junction | Midpoint between MAIN and SUB segments; use only if dual-string topology required; otherwise ground En2. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | En1 and En2 pins allow hardware-selectable MAIN/SUB backlight activation without MCU firmware changes. |
| PWM dimming without RC filter | Direct Cntrl-pin PWM interface (200–500 Hz optimal) eliminates external filtering components and reduces BOM count. |
| Integrated OVP and UVP | Hardware-protection thresholds prevent damage during LED open-circuit, battery sag, or supply transients. |
| Low-profile DSBGA packaging | 10-bump, <1 mm height package enables ultra-thin portable designs with minimal board area footprint. |
| Cycle-by-cycle current limit | Prevents inductor saturation and FET overstress during startup or fault conditions; limit is 450–1050 mA depending on VIN. |
Applications
| Cellular Phone Backlight | Tablet Dual-Display System |
|---|---|
Use Scenario: Powering separate MAIN (front) and SUB (keyboard or secondary screen) white LED strings in clamshell or slider phones. IC Role / Device Role / Timing Role: Step-up converter with dual-FET bypass logic providing independent current regulation and on/off control per display segment. Use Value: Enables dynamic brightness scaling and segment blanking to extend battery life while maintaining visual consistency across displays. | Use Scenario: Driving front-facing main LCD and rear-facing auxiliary display in convertible tablets or 2-in-1 devices. IC Role / Device Role / Timing Role: Single-chip solution delivering 44 V output with programmable current per string and hardware-enabling logic for display priority sequencing. Use Value: Reduces component count vs. dual discrete boosters; eliminates inter-segment crosstalk through isolated FET control paths. |
| Portable Media Player UI | Industrial Handheld Terminal |
Use Scenario: Illuminating high-contrast OLED or TFT UI elements and status indicators under variable ambient lighting. IC Role / Device Role / Timing Role: Constant-current LED driver with analog (R1-based) and digital (PWM) dimming interfaces supporting real-time brightness adaptation. Use Value: Maintains consistent luminance across 2.5–5.5 V battery discharge curve using feedback-stabilized current regulation. | Use Scenario: Backlighting ruggedized LCDs in warehouse scanners or field service terminals operating in wide temperature ranges. IC Role / Device Role / Timing Role: Robust boost controller with −40°C to +125°C junction rating, thermal shutdown, and ESD-hardened I/O pins. Use Value: Ensures reliable display operation in harsh environments where condensation, vibration, or thermal cycling would degrade standard drivers. |
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-35/NOPB | 35 V output rating; OVP threshold 31.0–35.0 V; identical pinout and control logic. | Suitable for 2–5 LED strings requiring ≤35 V compliance; lower max output limits peak stress on external diode/capacitor. | Select when system OVP margin or component voltage derating requires headroom below 44 V. |
| TPS61165DRVR | 40 V output; integrated 1.2-A switch; no dual-FET bypass; uses single enable and I2C interface. | Lacks hardware-enabling for dual segments; requires MCU communication for display control; higher integration but less flexible topology. | Choose for simpler single-display systems where I2C configurability outweighs need for independent En1/En2 hardware control. |
Compared with LM3502ITL-35/NOPB, the LM3502ITL-44/NOPB provides higher output headroom for longer LED strings or higher forward-voltage LEDs, while retaining identical thermal, dimming, and enable behavior; versus TPS61165DRVR, it offers direct hardware segmentation control without firmware dependency but requires external diode and more layout attention.
Availability
LM3502ITL-44/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, tablet dual-display systems, portable media player UI illumination, and industrial handheld terminal backlighting requiring stable component supply and long-term production continuity.
Supply support for LM3502ITL-44/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 broad industrial, automotive, and consumer design expertise.
The LM3502 product line was designed specifically for efficient, compact, and flexible white LED backlighting in space-constrained portable electronics - emphasizing dual-display control, low IQ, and robust protection.
FAQ
What is the maximum output voltage supported by the LM3502ITL-44/NOPB?
The LM3502ITL-44/NOPB is rated for a nominal 44 V output with over-voltage protection (OVP) triggered between 40.5 V and 43.5 V. This allows safe operation with up to 10 white LEDs (typical VF ≈ 4.2 V each) while protecting against open-circuit faults. The OVP threshold is fixed and not adjustable; exceeding 43.5 V at VOUT1 will disable switching.
How does the LM3502ITL-44/NOPB implement dual-display control?
The LM3502ITL-44/NOPB uses two dedicated enable pins - En1 for the MAIN display segment (VOUT1–VOUT2) and En2 for the SUB segment (VOUT2–Fb). Each pin has 0.3 V / 1.4 V logic thresholds and internal pull-downs, allowing independent hardware control of LED string current paths without MCU intervention. When both En1 and En2 are low and Cntrl is high, the device enters low-IQ shutdown.
Can the LM3502ITL-44/NOPB be used with a single LED string?
Yes, the LM3502ITL-44/NOPB supports single-string configurations. Connect the full LED string between VOUT1 and Fb, ground En2, and use En1 and Cntrl together for global on/off control. The internal NMOS (N2) remains inactive, and all current flows through the PMOS (P1) and power NMOS (N1), preserving efficiency and regulation accuracy.
What is the recommended external diode for the LM3502ITL-44/NOPB?
Texas Instruments specifies the MBRM140T3 Schottky diode in the LM3502ITL-44/NOPB reference design. It features 40 V reverse voltage rating, 1 A average forward current, low forward voltage (~0.45 V @ 1 A), and fast recovery - critical for minimizing conduction loss and EMI at 1 MHz switching. Place it as close as possible to the VOUT1 pin with minimal trace inductance.
Does the LM3502ITL-44/NOPB require external compensation components?
No, the LM3502ITL-44/NOPB is internally compensated and requires no external compensation network. Its current-mode control architecture with built-in error amplifier, soft-start, and duty-cycle limiting enables stable operation across input voltage (2.5–5.5 V), output load (2–10 LEDs), and temperature (−40°C to +125°C) without loop tuning components.
LM3502ITL-44/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:
- 44V
- 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-44/NOPB FAQ
1.How can I place an order for LM3502ITL-44/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITL-44/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-44/NOPB reliable?
The price and inventory of LM3502ITL-44/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-44/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITL-44/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITL-44/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITL-44/NOPB?
LM3502ITL-44/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITL-44/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-44/NOPB?
For technical support, including LM3502ITL-44/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITL-44/NOPB requirements.
6.How does Aetrix verify that LM3502ITL-44/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITL-44/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-44/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITL-44/NOPB?
All LM3502ITL-44/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITL-44/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-44/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITL-44/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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