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Texas Instruments LM3500TL-16/NOPB
- Part No.:
- LM3500TL-16/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-WFBGA
- Datasheet:
-
LM3500TL-16/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 400MA 8USMD
- Quantity:
- Payment:
- Shipping:
Inventory:3,650
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Product details
Overview
LM3500TL-16/NOPB from Texas Instruments is a synchronous step-up DC/DC converter optimized for white LED backlighting, featuring 15.5V internal overvoltage protection (OVP), 1MHz fixed switching frequency, 2.7V–7V input range, and ability to drive 3–4 series white LEDs. It integrates NMOS/PMOS synchronous rectification, eliminating external Schottky diodes, and delivers high efficiency in handheld LCD bias supplies.
For engineers reviewing the LM3500TL-16/NOPB datasheet, LM3500TL-16/NOPB pinout, LM3500TL-16/NOPB application, or LM3500TL-16/NOPB equivalent, key selection criteria include OVP threshold (15.5V), feedback voltage (500mV), shutdown current (0.1µA), thermal shutdown (150°C), and 8-bump thin DSBGA package compatibility with ceramic capacitor-based compact designs.
Technical Context
The LM3500TL-16/NOPB employs current-mode PWM control with internal compensation, enabling stable regulation across load variations without external loop components. Its synchronous rectification architecture uses integrated NMOS (RDSON = 0.43Ω) and PMOS (RDSON = 1.1–2.3Ω) switches, reducing conduction loss and improving efficiency over diode-based boost converters.
Protection circuitry includes input undervoltage lockout (UVP: 2.4–2.6V ON threshold), output overvoltage protection (OVP: 15–16V trip range with 900mV hysteresis), and thermal shutdown (150°C trip, 115°C recovery). The SHDN pin supports true isolation (0.1µA shutdown current) and PWM dimming via logic-level control (0.3V low / 1.1V high thresholds).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output OVP Threshold | 15.5V typical; clamps open-circuit output to prevent damage to 16V-rated ceramic capacitors and LEDs. |
| Feedback Voltage (VFB) | 500mV ±30mV; sets LED current via external resistor (ILED = 0.5V / RLED), enabling precise analog dimming. |
| Switching Frequency | 1.0MHz ±150kHz; enables use of small inductors (e.g., 22µH) and minimizes EMI in portable RF-sensitive environments. |
| Input Voltage Range | 2.7V–7.0V; supports single-cell Li-ion (3.0–4.2V), 3-cell NiMH (3.6V), and USB-powered systems without LDO pre-regulation. |
| Shutdown Current | 0.1µA maximum; ensures negligible battery drain during display-off states in battery-powered handhelds. |
| Thermal Shutdown | 150°C trip with 35°C hysteresis; protects die under sustained high-current operation (e.g., 4-LED strings at 20mA). |
| Package | 8-bump thin DSBGA (1.5mm × 1.5mm, 0.5mm pitch); enables ultra-compact PCB layout for space-constrained mobile displays. |
Pinout & Package
LM3500TL-16/NOPB uses an 8-bump thin DSBGA package with 1.5mm × 1.5mm footprint and 0.5mm ball pitch. Thermal performance is enhanced by direct die attachment to PCB ground plane via exposed GND balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | AGND | Analog ground reference; must be tied directly to power GND (C3) to minimize noise coupling into feedback path. |
| B1 | VIN | Main power input (2.7–7V); requires local 1µF ceramic bypass capacitor between VIN and GND to suppress switching ripple. |
| C1 | VOUT | PMOS source output; connects to cathode of LED string and output capacitor (COUT) - primary high-voltage rail node. |
| C2 | VSW | Switch node (NMOS drain / PMOS drain); carries high di/dt; must be routed short and adjacent to inductor to limit EMI. |
| C3 | GND | Power ground; serves as return path for inductor current and output capacitor discharge; ties to PCB ground plane. |
| B3 | FB | Feedback input; senses output voltage divider; sets LED current via resistor to GND (ILED = 0.5V / RLED). |
| A2 | SHDN | Active-high shutdown control; <0.3V disables converter with 0.1µA quiescent current; >1.1V enables operation and supports PWM dimming. |
| A3 | NC | No internal connection; voltage must not exceed 7.5V; leave unconnected or tie to GND for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Integrated NMOS/PMOS switch pair eliminates external Schottky diode, reducing BOM count and improving efficiency by ~8% at 20mA. |
| Internal OVP circuitry | 15.5V clamp with 900mV hysteresis prevents destructive overvoltage during LED string open-circuit faults, enabling 16V ceramic COUT. |
| True shutdown isolation | 0.1µA shutdown current and complete VIN-to-VOUT disconnection prevent LED leakage current and extend battery life in sleep mode. |
| Fixed 1MHz switching | Enables use of small, low-profile inductors (e.g., Coilcraft DT1608C-223) and reduces audible noise compared to sub-500kHz boost converters. |
| Low 500mV feedback voltage | Minimizes power loss in current-setting resistor, allowing precise LED current control down to 1mA with standard 1% resistors. |
Applications
| Handheld LCD Backlighting | Digital Camera Flash Support |
|---|---|
|
Use Scenario: Driving 3–4 white LEDs in series for QVGA–WQVGA TFT-LCD panels in smartphones and PDAs. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated 12–15V output from 3.0–4.2V Li-ion battery. Use Value: Synchronous topology achieves >85% efficiency at 15mA per LED, extending battery runtime while maintaining uniform brightness. |
Use Scenario: Powering auxiliary white LED flash arrays in compact digital cameras and camcorders. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering pulsed 15V/100mA bursts synchronized to shutter timing. Use Value: 1MHz switching allows fast transient response to PWM-triggered flash pulses without output droop or overshoot. |
| Portable Media Player Display | Industrial Handheld Terminal UI |
|
Use Scenario: Backlighting OLED or LCD screens in MP3 players and e-readers operating from single-cell batteries. IC Role / Device Role / Timing Role: Constant-current LED driver with analog dimming via FB resistor and PWM dimming via SHDN pin. Use Value: 0.1µA shutdown current and 500mV VFB enable microamp-level standby power and fine-grained brightness control. |
Use Scenario: Illuminating ruggedized LCDs in warehouse scanners, field service tablets, and medical handhelds. IC Role / Device Role / Timing Role: Robust boost converter with UVP (2.4V) and thermal shutdown (150°C) for wide-temperature industrial operation. Use Value: Integrated protection prevents latch-up during cold-start or hot ambient conditions, ensuring reliable UI illumination across −40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61061DRVR | Higher 28V OVP, 1.2MHz switching, but requires external compensation and lacks true shutdown isolation (1µA vs. 0.1µA). | Supports up to 6-series LEDs; less suitable for ultra-low-power sleep modes due to higher shutdown current. | Choose TPS61061DRVR when driving >4 LEDs or requiring tighter output regulation; retain LM3500TL-16/NOPB for minimal BOM and lowest quiescent current. |
| MAX1910ETE+ | 2.5V–5.5V input only, 16V OVP, no integrated PMOS - requires external Schottky diode, increasing losses and board area. | Limited to 3-series LEDs with Li-ion input; lower efficiency (~78%) due to diode conduction loss. | Select MAX1910ETE+ only if legacy design reuse mandates diode-based topology; LM3500TL-16/NOPB offers superior efficiency and smaller solution size. |
Compared with TPS61061DRVR and MAX1910ETE+, the LM3500TL-16/NOPB provides the lowest shutdown current (0.1µA), fully integrated synchronous rectification, and smallest 1.5mm × 1.5mm DSBGA footprint - making it optimal for space- and battery-life-constrained portable LED backlighting.
Availability
LM3500TL-16/NOPB is available at Aetrix Electronics and suitable for handheld LCD backlighting, digital camera flash circuits, and portable media player displays requiring stable component supply and long-term production continuity.
Supply support for LM3500TL-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 and embedded processing technologies, with decades of expertise in power management ICs for portable electronics.
The LM3500 product line was designed specifically for high-efficiency white LED backlighting in battery-powered devices, emphasizing minimal external components, low quiescent current, and robust fault protection.
FAQ
What is the maximum number of white LEDs the LM3500TL-16/NOPB can drive in series?
The LM3500TL-16/NOPB can reliably drive 3–4 white LEDs in series, depending on forward voltage (VF). With VF ≤3.61V per LED, four LEDs are supported (4 × 3.61V + 0.53V = 14.97V ≤15V OVP minimum). Five LEDs require VF ≤2.89V each, which is uncommon at room temperature. The LM3500TL-16/NOPB datasheet confirms this limit based on its 15.5V OVP threshold and 500mV feedback voltage.
Does the LM3500TL-16/NOPB require an external Schottky diode?
No, the LM3500TL-16/NOPB does not require an external Schottky diode. It integrates both NMOS and PMOS power switches for synchronous rectification, eliminating conduction loss and heat generation associated with external diodes. This integration is explicitly stated in the LM3500TL-16/NOPB features list and confirmed in the block diagram and application circuit.
How is LED current set and controlled on the LM3500TL-16/NOPB?
LED current is set by a resistor from the FB pin to GND using ILED = 0.5V / RLED. Dimming is achieved either by adjusting RLED (analog dimming) or applying a PWM signal to the SHDN pin (0.3V low / 1.1V high thresholds), enabling duty-cycle control from 100Hz to 1kHz. The LM3500TL-16/NOPB datasheet specifies 200–500Hz as optimal for µA-level current control.
What protection features are built into the LM3500TL-16/NOPB?
The LM3500TL-16/NOPB includes input undervoltage lockout (UVP: 2.4–2.6V), output overvoltage protection (OVP: 15–16V with 900mV hysteresis), thermal shutdown (150°C trip), and true shutdown isolation. These protections are implemented in hardware and do not require external components - all confirmed in the LM3500TL-16/NOPB absolute maximum ratings and functional description sections.
What is the recommended output capacitor for the LM3500TL-16/NOPB?
A 1µF X7R/X5R ceramic capacitor rated for 16V is recommended for the LM3500TL-16/NOPB output. This value is validated in TI's typical application circuit and supports low ESR requirements for minimizing ripple. The 15.5V OVP threshold enables safe use of 16V-rated ceramics, and multilayer construction ensures stable capacitance across temperature and bias.
LM3500TL-16/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 7V
- Voltage - Output:
- 16V
- Current - Output / Channel:
- 400mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
LM3500TL-16/NOPB FAQ
1.How can I place an order for LM3500TL-16/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3500TL-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 LM3500TL-16/NOPB reliable?
The price and inventory of LM3500TL-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 LM3500TL-16/NOPB is usually 5 days.
3.What payment methods are accepted for LM3500TL-16/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3500TL-16/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3500TL-16/NOPB?
LM3500TL-16/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3500TL-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 LM3500TL-16/NOPB?
For technical support, including LM3500TL-16/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3500TL-16/NOPB requirements.
6.How does Aetrix verify that LM3500TL-16/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3500TL-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 LM3500TL-16/NOPB meets industry standards.
7.What is the process for return or replacement of LM3500TL-16/NOPB?
All LM3500TL-16/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3500TL-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 LM3500TL-16/NOPB part is unused and in its original packaging.
Return procedure for LM3500TL-16/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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