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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Texas Instruments LM3502ITLX-35/NOPB

Name: LM3502ITLX-35/NOPB
Brand: Texas Instruments
SKU: LM3502ITLX-35/NOPB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM3502ITLX-35/NOPB

Manufacturer:: Texas Instruments

Category:: LED Drivers

Package:: 10-WFBGA, DSBGA

Datasheet:: LM3502ITLX-35/NOPB.pdf

Description:: IC LED DRVR RGLTR PWM 10TUSMD

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Product details

Overview

LM3502ITLX-35/NOPB from Texas Instruments is a 35V-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 2.5–5.5V input, and supports PWM dimming without external RC filtering. Used in cellular phones and PDAs with 2–5 LEDs per string.

For engineers reviewing the LM3502ITLX-35/NOPB datasheet, LM3502ITLX-35/NOPB pinout, LM3502ITLX-35/NOPB application, or LM3502ITLX-35/NOPB equivalent, key selection criteria include its 35V OVP threshold (32.0–35.0V), 1 MHz fixed switching frequency, dual enable logic (En1/En2), feedback voltage of 0.25 V, and thermal shutdown protection at +150°C junction temperature.

Technical Context

The LM3502ITLX-35/NOPB implements an asynchronous current-mode PWM control architecture with cycle-by-cycle current limiting and dedicated light-load PFM mode. Its internal power NMOS switch (N1) features R_DS(ON) ≤1.1 Ω, while integrated PMOS (P1) and NMOS (N2) bypass FETs support independent MAIN/SUB segment activation via En1 and En2 pins.

Operation relies on a 0.25 V feedback reference, 1 MHz oscillator, and dual protection comparators: under-voltage lockout (UVP: 2.2–2.5 V) and over-voltage protection (OVP: 31.0–35.0 V for -35 variant). Soft-start eliminates inrush current, and shutdown current is ≤3 µA with Cntrl ≤0.3 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	35 V nominal; OVP threshold 31.0–35.0 V ensures safe operation when LED string opens.
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 (2.5–3.2 V) supplies.
Switching Frequency	1 MHz ±20%; enables use of small 2.2 µH inductors and reduces EMI filter size.
Feedback Voltage	0.25 V typical; sets LED current via external resistor (I_LED = 0.25 V / R_SET).
Efficiency	>80% at full load; measured with 10 white LEDs, VIN = 3.3 V, I_LED = 20 mA per string.
Shutdown Current	≤3 µA; achieved when Cntrl ≤0.3 V, enabling ultra-low-power system sleep states.
Junction Temperature	−40°C to +125°C; rated for industrial ambient (−40°C to +85°C) with thermal shutdown at +150°C.

Pinout & Package

LM3502ITLX-35/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	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 internal N1 switch; connects to inductor and Schottky diode anode; minimize trace length/width for EMI reduction.
En1	MAIN display FET control	Controls PMOS (P1) switch; ≤0.3 V enables MAIN OFF, ≥1.4 V enables MAIN ON; internal pull-down defaults to OFF.
En2	SUB display FET control	Controls NMOS (N2) switch; ≤0.3 V enables SUB OFF, ≥1.4 V enables SUB ON; internal pull-down defaults to OFF.
Fb	Current-sense feedback	0.25 V reference node; connects to current-setting resistor to ground; bias current ≤500 nA.
Cntrl	Global enable/shutdown	≥1.4 V enables device; ≤0.3 V forces shutdown; internal pull-down holds default OFF state.
AGND	Analog ground	Must be shorted 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 sense & PMOS source	Connects to output capacitor cathode and Schottky diode cathode; OVP sensing node for 35 V version.
VOUT2	PMOS/NMOS drain junction	Drain connection of P1 and N2; used for SUB display string; 100 nF capacitor recommended if unused.

Key Features

Feature	Design Value
Dual independent display control	Separate En1/En2 pins allow MAIN and SUB white LED strings to be enabled/disabled independently without external logic.
PWM dimming without RC filter	Internal circuitry accepts direct PWM signal on Cntrl pin (200–500 Hz optimal) with no external components required for smooth brightness control.
Integrated protection suite	Includes UVP (2.2–2.5 V), OVP (31.0–35.0 V), thermal shutdown (+150°C), and cycle-by-cycle current limit (750 mA typical).
Low-profile packaging	10-bump DSBGA (1.5 mm × 1.5 mm, <1 mm height) enables ultra-thin portable designs with minimal board area usage.
No external compensation	Stable operation with only input/output capacitors and inductor; eliminates need for compensation network design effort.

Applications

Cellular Phone Dual Display	PDA Main/Sub Backlight
Use Scenario: Simultaneous illumination of main LCD and secondary status OLED in compact handheld devices. IC Role / Device Role / Timing Role: Step-up converter providing regulated 35 V to drive two independent white LED strings (2–5 LEDs each) with dynamic brightness control. Use Value: Enables independent MAIN/SUB dimming via En1/En2 pins and global PWM via Cntrl, reducing system-level MCU GPIO count and firmware complexity.	Use Scenario: Powering primary touchscreen backlight and auxiliary keypad illumination in battery-powered PDAs. IC Role / Device Role / Timing Role: Dual-channel white LED driver with 1 MHz switching frequency minimizing audible noise and enabling compact passive component selection. Use Value: >80% efficiency across 2.5–5.5 V input range extends battery life; low IQ shutdown (<3 µA) preserves charge during standby.
Portable Media Player UI	Smartwatch Display System
Use Scenario: Driving high-brightness front-panel display and low-power notification indicator in media players. IC Role / Device Role / Timing Role: Asynchronous boost converter with integrated bypass FETs managing two distinct LED current paths under microcontroller command. Use Value: 0.25 V feedback reference allows precise current setting (±10% typical) across temperature, ensuring consistent luminance in varying ambient conditions.	Use Scenario: Supporting always-on low-power watch face and interactive touch-sensitive display backlight in wearables. IC Role / Device Role / Timing Role: Compact DSBGA-packaged LED driver delivering 35 V output with thermal shutdown and UVP for robust operation in space-constrained enclosures. Use Value: 10-bump DSBGA footprint (1.5 mm × 1.5 mm) fits tight wearable layouts; −40°C to +125°C junction rating ensures reliability in body-worn thermal environments.

Cellular Phone Dual Display

PDA Main/Sub Backlight

Use Scenario: Simultaneous illumination of main LCD and secondary status OLED in compact handheld devices.

IC Role / Device Role / Timing Role: Step-up converter providing regulated 35 V to drive two independent white LED strings (2–5 LEDs each) with dynamic brightness control.

Use Value: Enables independent MAIN/SUB dimming via En1/En2 pins and global PWM via Cntrl, reducing system-level MCU GPIO count and firmware complexity.

Use Scenario: Powering primary touchscreen backlight and auxiliary keypad illumination in battery-powered PDAs.

IC Role / Device Role / Timing Role: Dual-channel white LED driver with 1 MHz switching frequency minimizing audible noise and enabling compact passive component selection.

Use Value: >80% efficiency across 2.5–5.5 V input range extends battery life; low IQ shutdown (<3 µA) preserves charge during standby.

Portable Media Player UI

Smartwatch Display System

Use Scenario: Driving high-brightness front-panel display and low-power notification indicator in media players.

IC Role / Device Role / Timing Role: Asynchronous boost converter with integrated bypass FETs managing two distinct LED current paths under microcontroller command.

Use Value: 0.25 V feedback reference allows precise current setting (±10% typical) across temperature, ensuring consistent luminance in varying ambient conditions.

Use Scenario: Supporting always-on low-power watch face and interactive touch-sensitive display backlight in wearables.

IC Role / Device Role / Timing Role: Compact DSBGA-packaged LED driver delivering 35 V output with thermal shutdown and UVP for robust operation in space-constrained enclosures.

Use Value: 10-bump DSBGA footprint (1.5 mm × 1.5 mm) fits tight wearable layouts; −40°C to +125°C junction rating ensures reliability in body-worn thermal environments.

Equivalent & Alternatives

The following parts are listed as comparable options for similar white LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM3502ITLX-25/NOPB	25 V OVP threshold (21.5–25.5 V); lower current limit (600 mA typ) and reduced VOUT1 stress margin.	Suitable for 6–8 LED strings with lower forward voltage; not safe for 35 V-rated 10-LED configurations.	Select only when total LED VF sum remains ≤23 V; verify OVP margin against worst-case open-circuit voltage.
TPS61165DRVR	40 V OVP, integrated 1.2 A switch, I²C interface, but no dual-enable logic; requires external MOSFETs for dual-string control.	Supports higher current and programmable dimming, but adds layout complexity and BOM cost for dual-display systems.	Prefer when digital control or >35 V headroom is needed; avoid when pin-count and analog simplicity are critical.

Compared with LM3502ITLX-25/NOPB and TPS61165DRVR, the LM3502ITLX-35/NOPB uniquely balances 35 V OVP safety margin, dual-analog enable control, and minimal external component count-making it optimal for cost-sensitive, space-constrained dual-backlight designs where fixed 35 V output suffices.

Availability

LM3502ITLX-35/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA dual-display systems, and portable media player UI lighting requiring stable component supply and long-term production continuity.

Supply support for LM3502ITLX-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 over 50 years of innovation in energy-efficient electronics.

The LM3502 product line targets portable display backlighting, delivering integrated step-up conversion with dual-string control and analog dimming capability for battery-powered consumer devices.

FAQ

What is the maximum output voltage supported by the LM3502ITLX-35/NOPB?

The LM3502ITLX-35/NOPB is configured for 35 V operation, with over-voltage protection triggered between 31.0 V and 35.0 V. This rating supports up to 10 white LEDs (3.2 V VF each) in series while maintaining safe margin against open-circuit failure. The device does not regulate beyond this threshold-output clamps to prevent damage to LEDs or external components.

How does the LM3502ITLX-35/NOPB implement dual-display control without external FETs?

The LM3502ITLX-35/NOPB integrates two internal bypass FETs: a PMOS (P1) controlled by En1 for MAIN string isolation, and an NMOS (N2) controlled by En2 for SUB string isolation. When En1 ≤0.3 V, P1 conducts and MAIN turns off; when En2 ≤0.3 V, N2 conducts and SUB turns off. Both pins have internal pull-downs, enabling default OFF behavior without external resistors.

Can the LM3502ITLX-35/NOPB be dimmed using a microcontroller's PWM output directly?

Yes-the LM3502ITLX-35/NOPB accepts direct PWM signals on the Cntrl pin without external RC filtering. For optimal linearity, use 200–500 Hz PWM frequency. If low-time (t_L) <12 ms, the device pauses switching without resetting soft-start; if t_L >12 ms, it enters full shutdown and resets soft-start to limit inrush current at wake-up.

What thermal management is required for the LM3502ITLX-35/NOPB in continuous operation?

The LM3502ITLX-35/NOPB uses a 10-bump DSBGA package with a die attach pad (DAP) that must be soldered to the PCB ground plane. With θ_JA = 65°C/W, sustained 500 mA output current at +85°C ambient requires ≥2 cm² copper pour under the DAP. Thermal shutdown activates at +150°C junction temperature, protecting the IC during transient overload or poor heatsinking.

Is the LM3502ITLX-35/NOPB compatible with ceramic output capacitors?

Yes-the LM3502ITLX-35/NOPB's over-voltage protection (OVP) circuitry allows safe use of low-ESR ceramic capacitors at the VOUT1 node. TI recommends placing a 10 µF X5R/X7R ceramic capacitor as close as possible to the VOUT1 and PGND pins. No electrolytic or tantalum capacitors are required, simplifying layout and improving reliability.

LM3502ITLX-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:: PWM

Applications:: Backlight

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 10-TµSMD (1.9x2.07)

LM3502ITLX-35/NOPB FAQ

1.How can I place an order for LM3502ITLX-35/NOPB through Aetrix?

Please submit a Request for Quotation (RFQ) for LM3502ITLX-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 LM3502ITLX-35/NOPB reliable?

The price and inventory of LM3502ITLX-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 LM3502ITLX-35/NOPB is usually 5 days.

3.What payment methods are accepted for LM3502ITLX-35/NOPB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITLX-35/NOPB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LM3502ITLX-35/NOPB?

LM3502ITLX-35/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LM3502ITLX-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 LM3502ITLX-35/NOPB?

For technical support, including LM3502ITLX-35/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITLX-35/NOPB requirements.

6.How does Aetrix verify that LM3502ITLX-35/NOPB is sourced from the original manufacturer or authorized distributors?

All LM3502ITLX-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 LM3502ITLX-35/NOPB meets industry standards.

7.What is the process for return or replacement of LM3502ITLX-35/NOPB?

All LM3502ITLX-35/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITLX-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 LM3502ITLX-35/NOPB part is unused and in its original packaging.

Return procedure for LM3502ITLX-35/NOPB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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