My Inquiry
My Account
Texas Instruments LM3502ITLX-16/NOPB
- Part No.:
- LM3502ITLX-16/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFBGA, DSBGA
- Datasheet:
-
LM3502ITLX-16/NOPB.pdf
- Description:
- IC LED DRVR RGLTR PWM 10TUSMD
- Quantity:
- Payment:
- Shipping:
Inventory:2,213
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3502ITLX-16/NOPB from Texas Instruments is a 16-V output, asynchronous step-up white LED driver IC with dual independent current-bypass FETs for MAIN/SUB display backlight control. It operates from 2.5 V to 5.5 V input, delivers >80% efficiency at 1 MHz fixed switching frequency, and supports PWM dimming without external RC filtering - used in dual-display portable devices requiring precise LED current regulation.
For engineers reviewing the LM3502ITLX-16/NOPB datasheet, LM3502ITLX-16/NOPB pinout, LM3502ITLX-16/NOPB application, or LM3502ITLX-16/NOPB equivalent, key selection criteria include its 16 V OVP threshold (±0.5 V), dual enable logic (En1/En2), integrated cycle-by-cycle current limit (400–650 mA typ), and WQFN-16 package thermal performance (θJA = 49°C/W).
Technical Context
The LM3502ITLX-16/NOPB implements asynchronous current-mode PWM control with internal NMOS power switch (N1), PMOS bypass switch (P1), and NMOS bypass switch (N2). Its feedback loop regulates LED current via a 0.25 V reference at the Fb pin, while dedicated UVP (2.5 V on-threshold) and OVP (15.5 V on-threshold) comparators protect against battery undervoltage and open-string faults.
Control logic enables independent MAIN (VOUT1–VOUT2) and SUB (VOUT2–Fb) LED string activation using En1 and En2 pins with 0.3 V / 1.4 V logic thresholds. The Cntrl pin provides shutdown and low-IQ mode entry (6–15 µA), and supports direct PWM dimming with tL < 12 ms preserving soft-start state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 16 V nominal; OVP on-threshold = 15.5 V ±0.5 V - sets maximum safe boost voltage for 4–10 white LEDs in series. |
| 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 use of small 2.2 µH inductors and reduces EMI filtering burden. |
| Feedback Reference | 0.25 V ±0.07 V - defines LED current as ILED = 0.25 V / RSET; enables accurate current setting with standard resistors. |
| Current Limit (N1) | 400–650 mA typical - protects internal NMOS switch during startup or short-circuit; limits peak inductor current. |
| Quiescent Current | 1.9–3 mA (switching), 0.1–3 µA (shutdown) - ensures minimal battery drain in standby and active backlight modes. |
| Thermal Resistance | θJA = 49°C/W (WQFN-16) - supports continuous operation up to +85°C ambient with proper PCB copper area. |
Pinout & Package
LM3502ITLX-16/NOPB uses a 16-pin, 4 mm × 4 mm, 0.8 mm max height thermally enhanced WQFN package (TI package code RGH0016A) with exposed die attach pad (DAP) soldered to PCB ground for optimal thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 13) | Supply input | Connects to 2.5–5.5 V source; requires local 4.7 µF ceramic capacitor to PGND. |
| Sw (Pins 2,3) | Power NMOS drain | High-slew node driving external boost inductor; minimize trace length/inductance to reduce EMI. |
| En1 (Pin 10) | PMOS bypass FET control | Enables MAIN display segment (VOUT1–VOUT2); 0.3 V / 1.4 V logic thresholds define ON/OFF states. |
| En2 (Pin 12) | NMOS bypass FET control | Enables SUB display segment (VOUT2–Fb); internal pull-down ensures default OFF state. |
| Fb (Pin 7) | Current sense feedback | Sets LED current via resistor to AGND; 0.25 V reference enables precision current programming. |
| Cntrl (Pin 9) | Global enable/shutdown | ≥1.4 V enables device; ≤0.3 V enters shutdown (0.1–3 µA IQ); supports direct PWM dimming. |
| AGND (Pin 14) | Analog ground | Reference for Fb, En1, En2, Cntrl; must be connected directly to PGND near device. |
| PGND (Pins 15,16) | Power ground | Return path for VIN, Sw, VOUT1, VOUT2; connect to large PCB ground plane under DAP. |
| VOUT1 (Pin 4) | OVP sense & PMOS source | Output node for MAIN string; OVP comparator monitors this pin; connect Schottky diode anode here. |
| VOUT2 (Pin 6) | Bypass FET drain | Midpoint node between MAIN and SUB strings; required for dual-string operation; 100 nF cap recommended for LM3502-35/44 variants. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent display control | Separate En1/En2 logic enables MAIN and SUB white LED strings without external switches or routing changes. |
| Integrated protection suite | UVP (2.5 V), OVP (15.5 V), thermal shutdown, and cycle-by-cycle current limiting eliminate need for discrete protection components. |
| PWM dimming without RC filter | Internal circuitry accepts 200–500 Hz PWM on Cntrl pin directly - avoids phase lag, component count, and layout complexity of analog dimming. |
| Fixed 1 MHz switching | Enables compact 2.2 µH inductors and low-ESR ceramic output capacitors; reduces solution size vs. lower-frequency boost converters. |
| Low-profile WQFN package | 4 mm × 4 mm × 0.8 mm footprint with thermal DAP supports high-power density in space-constrained handheld designs. |
Applications
| Cellular Phone Dual-Display Backlight | PDA Main/Sub Screen Lighting |
|---|---|
Use Scenario: Simultaneous illumination of primary LCD and secondary status OLED in clamshell phones. IC Role / Device Role / Timing Role: Step-up converter and dual-string current controller managing MAIN (VOUT1–VOUT2) and SUB (VOUT2–Fb) LED strings. Use Value: Enables independent brightness control per display using only two GPIOs (En1/En2), reducing MCU resource usage and BOM cost. |
Use Scenario: Powering main touchscreen backlight and auxiliary keypad/indicator LEDs in legacy PDAs. IC Role / Device Role / Timing Role: Asynchronous boost regulator with programmable current limit and 1 MHz switching for low-noise operation. Use Value: Delivers >80% efficiency across 2.5–5.5 V input range, extending battery life in intermittent-use portable devices. |
| Smartphone Secondary Display Driver | Portable Media Player UI Backlight |
Use Scenario: Driving small auxiliary display (e.g., cover screen or notification panel) alongside main display. IC Role / Device Role / Timing Role: Dual-path white LED driver with independent enable logic and shared boost stage. Use Value: Eliminates need for second boost IC - reduces PCB area by ~30% and simplifies thermal management. |
Use Scenario: Backlighting monochrome or color UI segments in MP3 players and e-readers. IC Role / Device Role / Timing Role: Constant-current LED driver with shutdown mode (0.1–3 µA IQ) for ultra-low standby power. Use Value: Achieves 12+ hour playback with backlight enabled due to high efficiency and low quiescent current. |
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 | Higher OVP threshold (24 V), increased current limit (450–750 mA), same pinout and control logic. | Supports longer LED strings (up to 8–10 LEDs at 3.0 V VF) but requires higher-voltage output capacitor and Schottky diode. | Select when driving >6 white LEDs in series or operating with higher forward voltage displays. |
| TPS61160DRVR | Single-output, 28-V OVP, 1.2-MHz switching, no dual-string enable logic; uses external current-sense resistor. | Lacks En1/En2 bypass FETs - cannot independently control MAIN/SUB segments without added MOSFETs and routing. | Choose for simpler single-display systems where dual-path control is unnecessary and higher OVP margin is preferred. |
Compared with LM3502ITLX-25/NOPB, the LM3502ITLX-16/NOPB offers tighter OVP tolerance and lower current limit suited for shorter LED strings, while TPS61160DRVR trades dual-control capability for higher integration of current sensing and wider input range - making it less suitable for true dual-display architectures.
Availability
LM3502ITLX-16/NOPB is available at Aetrix Electronics and suitable for cellular phone backlighting, PDA display modules, and portable media player UI lighting requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.
Supply support for LM3502ITLX-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 power conversion and LED driver innovation.
The LM3502 product line was designed specifically for dual-display white LED backlighting in portable consumer electronics, integrating boost conversion, dual current-path control, and robust protection in a single low-profile WQFN package.
FAQ
What is the OVP threshold for LM3502ITLX-16/NOPB?
The LM3502ITLX-16/NOPB has an over-voltage protection (OVP) on-threshold of 15.5 V ±0.5 V, with an off-threshold of 15.0 V. This ensures reliable shutdown if the output exceeds safe levels due to open LED string or load removal, protecting both the IC and external components. The OVP comparator continuously monitors the VOUT1 pin.
How does LM3502ITLX-16/NOPB support dual-display backlight control?
The LM3502ITLX-16/NOPB supports dual-display control via two dedicated enable pins: En1 controls the MAIN LED string (between VOUT1 and VOUT2), and En2 controls the SUB string (between VOUT2 and Fb). Each pin uses 0.3 V / 1.4 V logic thresholds, allowing independent on/off states - enabling configurations like MAIN-only, SUB-only, or both-on without external switches.
Can LM3502ITLX-16/NOPB be dimmed using PWM without external filtering?
Yes, LM3502ITLX-16/NOPB accepts direct PWM signals on the Cntrl pin across 200–500 Hz without requiring external RC filters. Its internal circuitry preserves soft-start state for tL < 12 ms, enabling fast recovery and linear brightness control - eliminating component count and layout complexity associated with analog dimming solutions.
What is the recommended inductor value for LM3502ITLX-16/NOPB?
Texas Instruments recommends a 2.2 µH shielded inductor (e.g., DO1608C-223) for LM3502ITLX-16/NOPB. This value balances peak current handling, size, and efficiency across the 2.5–5.5 V input range and 16 V output. Inductor saturation current must exceed the calculated peak inductor current - typically >750 mA for 10-LED strings at 20 mA each.
Does LM3502ITLX-16/NOPB require external compensation components?
No, LM3502ITLX-16/NOPB operates with no external compensation components. Its current-mode architecture and internal error amplifier provide stable regulation across input voltage, load, and temperature variations - simplifying design and reducing bill-of-materials compared to voltage-mode boost controllers requiring external RC networks.
LM3502ITLX-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)
LM3502ITLX-16/NOPB FAQ
1.How can I place an order for LM3502ITLX-16/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3502ITLX-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 LM3502ITLX-16/NOPB reliable?
The price and inventory of LM3502ITLX-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 LM3502ITLX-16/NOPB is usually 5 days.
3.What payment methods are accepted for LM3502ITLX-16/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3502ITLX-16/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3502ITLX-16/NOPB?
LM3502ITLX-16/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3502ITLX-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 LM3502ITLX-16/NOPB?
For technical support, including LM3502ITLX-16/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3502ITLX-16/NOPB requirements.
6.How does Aetrix verify that LM3502ITLX-16/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3502ITLX-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 LM3502ITLX-16/NOPB meets industry standards.
7.What is the process for return or replacement of LM3502ITLX-16/NOPB?
All LM3502ITLX-16/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3502ITLX-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 LM3502ITLX-16/NOPB part is unused and in its original packaging.
Return procedure for LM3502ITLX-16/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3502ITLX-16/NOPB Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
