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Texas Instruments LM3502ITL-16/NOPB
- Part No.:
- LM3502ITL-16/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITL-16/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3502ITL-16/NOPB from Texas Instruments is a 16-V output, asynchronous step-up white LED driver IC with dual-display control logic, 1 MHz fixed-frequency PWM operation, 2.5–5.5 V input range, and integrated NMOS/PMOS bypass FETs for MAIN/SUB backlight segmentation. It delivers up to 1050 mA peak switch current and supports PWM dimming without external RC filtering in portable dual-display backlighting.
For engineers reviewing the LM3502ITL-16/NOPB datasheet, LM3502ITL-16/NOPB pinout, LM3502ITL-16/NOPB application, or LM3502ITL-16/NOPB equivalent, key selection criteria include its 16 V OVP threshold, dual enable (En1/En2) logic for independent display segment control, internal soft-start, and WQFN-16 package thermal performance (θJA = 49°C/W).
Technical Context
The LM3502ITL-16/NOPB implements asynchronous current-mode PWM control with cycle-by-cycle current limiting, over-voltage protection triggered at 14.5–16.5 V, and under-voltage lockout at 2.4–2.5 V. Its internal architecture integrates two independent FET switches (PMOS P1 for MAIN, NMOS N2 for SUB) controlled by En1 and En2 pins with 0.3 V/1.4 V logic thresholds.
It operates in continuous conduction mode (CCM) or pulse-frequency modulation (PFM) under light load, features dedicated UVP/OVP/thermal shutdown circuits, and accepts direct PWM on the Cntrl pin with tL < 12 ms enabling seamless dimming without soft-start reset.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 16 V nominal OVP threshold; regulates LED string voltage up to 16 V with ±0.5 V hysteresis. |
| Input Voltage Range | 2.5 V to 5.5 V; compatible with single Li-ion or 3×AA battery supplies without external regulation. |
| Switching Frequency | 1 MHz ±20%; enables compact magnetics (e.g., 2.2 µH) and reduces EMI filter size. |
| Peak Switch Current | 650 mA max (typ. 400 mA); sets inductor and Schottky diode sizing for 10-LED strings at 20–30 mA per LED. |
| Feedback Voltage | 0.25 V ±0.07 V; defines LED current via external resistor: ILED = 0.25 V / RSET. |
| Quiescent Current | 1 µA in shutdown (Cntrl = 0 V); extends battery life in always-on portable devices. |
| Thermal Resistance | θJA = 49°C/W (WQFN-16); supports >300 mW power dissipation at 85°C ambient with PCB copper pour. |
Pinout & Package
LM3502ITL-16/NOPB uses a 16-pin, 3 mm × 3 mm, 0.8 mm height Thin WQFN package (RGH0016A), with exposed DAP soldered to PCB ground for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 2.5–5.5 V; requires local 4.7 µF ceramic capacitor to minimize high-frequency ripple. |
| Sw | Power NMOS drain | Connects to inductor and Schottky anode; trace must be short/wide to reduce EMI and conduction loss. |
| En1 | PMOS (MAIN) enable control | ≤0.3 V turns ON MAIN display; ≥1.4 V disables MAIN; internal pull-down defaults to ON state. |
| En2 | NMOS (SUB) enable control | ≤0.3 V turns ON SUB display; ≥1.4 V disables SUB; internal pull-down defaults to ON state. |
| Fb | Current-sense feedback node | Sets LED current via resistor to AGND; 0.25 V reference enables precise current programming. |
| Cntrl | Global enable/shutdown | ≥1.4 V enables device; ≤0.3 V forces shutdown; supports direct PWM dimming without RC filter. |
| AGND | Analog ground reference | Must connect directly to PGND plane to avoid noise coupling into feedback path. |
| PGND | Power ground return | High-current return for Sw, VOUT1, VOUT2; requires low-impedance connection to DAP and PCB ground. |
| VOUT1 | OVP sense & PMOS source | Connects to LED string anode and output capacitor; OVP triggers at 14.5–16.5 V to protect LEDs. |
| VOUT2 | NMOS/PMOS drain junction | Provides tap point between MAIN and SUB LED segments; optional for single-string configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | Separate En1/En2 pins allow MAIN and SUB backlight segments to be enabled/disabled independently-no external logic required. |
| Direct PWM dimming interface | Cntrl pin accepts 200–500 Hz PWM signals without RC filtering; tL < 12 ms preserves soft-start state for fast brightness transitions. |
| Integrated protection suite | UVP (2.4 V), OVP (16 V), thermal shutdown, and cycle-by-cycle current limit eliminate need for discrete protection components. |
| Low-profile WQFN packaging | 3 mm × 3 mm × 0.8 mm footprint with thermal DAP enables ultra-thin portable designs and improves power density. |
| No external compensation required | Stable operation with only input/output capacitors and inductor-reduces BOM count and layout complexity. |
Applications
| Cellular Phone Dual Display | PDA Main/Sub Backlight |
|---|---|
Use Scenario: Simultaneous illumination of main LCD and secondary status OLED in clamshell phones with independent brightness control. IC Role / Device Role / Timing Role: LM3502ITL-16/NOPB acts as dual-channel boost controller, regulating 8–10 white LEDs across two strings using En1/En2 logic and Cntrl-based PWM dimming. Use Value: Eliminates need for two separate LED drivers; reduces PCB area by 40% and component count by 6 vs. discrete solutions. | Use Scenario: Powering primary touchscreen backlight and auxiliary keypad illumination in handheld PDAs with dynamic power allocation. IC Role / Device Role / Timing Role: LM3502ITL-16/NOPB serves as single-chip dual-output LED driver, switching between MAIN and SUB modes via microcontroller GPIOs on En1/En2. Use Value: Enables zero-latency display mode switching (e.g., landscape/portrait) with no firmware delay or external sequencing logic. |
| Portable Media Player UI | Smartwatch Secondary Display |
Use Scenario: Driving high-brightness front panel LCD and low-power secondary notification strip in MP3/video players. IC Role / Device Role / Timing Role: LM3502ITL-16/NOPB functions as segmented boost converter, delivering 20 mA to MAIN (6–8 LEDs) and 5 mA to SUB (2–4 LEDs) with independent current setting. Use Value: Achieves >80% efficiency at 3.3 V input while maintaining <1.5% LED current mismatch between segments. | Use Scenario: Illuminating always-on time display and interactive touch-sensitive zone on circular smartwatches with space-constrained layouts. IC Role / Device Role / Timing Role: LM3502ITL-16/NOPB operates as compact dual-path LED driver, using VOUT2 as intermediate tap to split 16 V rail into MAIN (12 V) and SUB (4 V) outputs. Use Value: Supports sub-1 mm profile design with thermal DAP dissipating 220 mW at 85°C ambient-critical for wearable thermal limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3502ITL-25/NOPB | 25 V OVP threshold; higher current limit (800 mA typ.) | Supports longer LED strings (up to 8×3.2 V) or higher-current configurations | Select when driving >8 white LEDs or requiring >16 V headroom |
| TPS61165DRVR | Single-output, 38-V OVP, I²C programmable current, 1.2-MHz switching | Lacks dual-segment enable logic; requires external MCU control for multi-display sequencing | Choose for systems needing digital current tuning or higher voltage margin, not dual independent control |
Compared with LM3502ITL-25/NOPB, the LM3502ITL-16/NOPB offers tighter OVP tolerance (±0.5 V vs. ±1.5 V) and lower quiescent current in shutdown (1 µA vs. 2.5 µA), making it preferable for battery-critical dual-display devices operating near 16 V LED stack voltage.
Availability
LM3502ITL-16/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, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3502ITL-16/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 portable power conversion and LED lighting solutions.
The LM3502 product line targets ultra-compact, high-efficiency white LED backlight drivers for dual-display portable electronics, emphasizing integration, thermal efficiency, and direct PWM compatibility without external filtering.
FAQ
What is the maximum LED string voltage supported by the LM3502ITL-16/NOPB?
The LM3502ITL-16/NOPB has a nominal over-voltage protection (OVP) threshold of 16 V, with an on-threshold range of 14.5–16.5 V and off-threshold of 14.0–16.0 V. This allows safe operation with white LED strings totaling up to ~12 V forward voltage (e.g., 4×3.2 V), preserving 4 V headroom for regulation margin and transient suppression. Exceeding 16.5 V triggers immediate shutdown.
How does the LM3502ITL-16/NOPB handle dual-display control without external logic?
The LM3502ITL-16/NOPB integrates two independent MOSFET switches-PMOS P1 controlled by En1 and NMOS N2 controlled by En2-that physically segment a single LED string into MAIN (VOUT1–VOUT2) and SUB (VOUT2–Fb) sections. Each enable pin uses 0.3 V/1.4 V logic thresholds with internal pull-downs, allowing direct GPIO control from a microcontroller to activate either or both segments without additional transistors or level shifters.
Can the LM3502ITL-16/NOPB be dimmed using a PWM signal applied directly to the Cntrl pin?
Yes-the LM3502ITL-16/NOPB supports direct PWM dimming on the Cntrl pin across 200–500 Hz frequencies. When the low-time (tL) is less than 12 ms, the device maintains soft-start state and modulates LED current proportionally without restarting the startup sequence. This eliminates the need for external RC filters and enables fast, flicker-free brightness control in portable UIs.
What thermal design considerations apply to the LM3502ITL-16/NOPB in a WQFN-16 package?
The LM3502ITL-16/NOPB in its RGH0016A WQFN package has θJA = 49°C/W. To maintain TJ ≤ 125°C at 85°C ambient, total power dissipation must stay below 816 mW. This requires soldering the exposed DAP pad to a minimum 100 mm² internal or external copper pour, using ≥4 thermal vias (0.3 mm diameter) to inner ground planes, and keeping high-current traces (Sw, PGND, VOUT1) wide and short.
Is an external compensation network required for stable operation of the LM3502ITL-16/NOPB?
No-LM3502ITL-16/NOPB is internally compensated and requires no external compensation components. Stability is ensured with only the recommended external parts: input capacitor (4.7 µF ceramic), output capacitor (1 µF ceramic), inductor (2.2 µH), and Schottky diode (e.g., MBRM140T3). This simplifies layout, reduces BOM cost, and eliminates tuning effort during design validation.
LM3502ITL-16/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:
- 16V
- Current - Output / Channel:
- 400mA (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-16/NOPB FAQ
1.How can I place an order for LM3502ITL-16/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITL-16/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-16/NOPB reliable?
The price and inventory of LM3502ITL-16/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-16/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITL-16/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITL-16/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITL-16/NOPB?
LM3502ITL-16/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITL-16/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-16/NOPB?
For technical support, including LM3502ITL-16/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITL-16/NOPB requirements.
6.How does Aetrix verify that LM3502ITL-16/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITL-16/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-16/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITL-16/NOPB?
All LM3502ITL-16/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITL-16/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-16/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITL-16/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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