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Texas Instruments LM3508TL/NOPB
- Part No.:
- LM3508TL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 9-WFBGA, DSBGA
- Datasheet:
-
LM3508TL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:890
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Product details
Overview
LM3508TL/NOPB from Texas Instruments is a synchronous boost LED driver IC designed to deliver constant-current drive for up to four series white LEDs at 30mA from a 2.7V–5.5V single-cell Li-ion supply. It integrates internal NMOS/PMOS power switches, achieves >80% peak efficiency, provides ±5% LED current regulation across input voltage range, and features 850kHz fixed-frequency operation with true shutdown isolation.
For engineers reviewing the LM3508TL/NOPB datasheet, LM3508TL/NOPB pinout, LM3508TL/NOPB application, or LM3508TL/NOPB equivalent, key selection considerations include its 9-bump DSBGA package (1.514mm × 1.514mm), PWM dimming support up to 100kHz, 17.5V over-voltage protection threshold, output short-circuit protection with recovery at VIN × 0.95, and internal soft-start eliminating inrush current during EN assertion.
Technical Context
The LM3508TL/NOPB implements a current-mode synchronous boost controller with integrated NMOS switch (0.5Ω typical RDS(ON)) and PMOS synchronous rectifier (2.2Ω typical RDS(ON)). Its regulated current sink maintains VILED = 500mV, enabling precise ILED = 200mV/RSET control independent of forward voltage variation across LED strings.
It employs an internal 200mV reference modulated by DIM-pin PWM input through an RC filter (≈500Hz cutoff), allowing duty-cycle-proportional LED current adjustment. Protection includes output short-circuit detection (VOUT < VIN × 0.93), over-voltage clamping (17.5V–21.8V trip range), thermal shutdown (>150°C), and true shutdown isolation with <1µA quiescent current and output disconnected from input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports direct connection to single-cell Li-ion batteries without pre-regulation. |
| LED Current Accuracy | ±5% - guaranteed across full 2.7V–5.5V input range, enabling stable brightness in portable battery-powered systems. |
| Switching Frequency | 850kHz (typ) - allows use of small 22µH inductors and 1µF ceramic capacitors, minimizing board area. |
| Over-Voltage Protection | 17.5V (min) - prevents damage to output capacitors and LEDs during open-load conditions; enables 25V-rated 0603 MLCCs. |
| Output Short-Circuit Recovery | VIN × 0.95 (typ) - ensures automatic resumption of normal operation after short removal without external intervention. |
| Quiescent Current (Shutdown) | <1µA - eliminates battery drain in standby mode; critical for always-on handheld devices. |
| Thermal Shutdown Threshold | +150°C - protects die integrity under sustained high-power or poor PCB thermal design conditions. |
Pinout & Package
LM3508TL/NOPB uses a 9-bump DSBGA package (YZR000911A), measuring 1.514mm × 1.514mm × 0.6mm, with 0.5mm pitch and SNAGCU ball finish (MSL Level-1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | PGND | Power ground return for high-current paths (SW, OUT, ILED); must be low-impedance and separate from AGND plane. |
| A2 | SW | Switch node connecting inductor to internal NMOS drain and PMOS source; carries high di/dt ripple requiring short trace routing. |
| A3 | OUT | Boost output node supplying LED string anode; also serves as OVP sense point and PMOS source connection. |
| B1 | ILED | Current-sink cathode node for LED string; regulated at 500mV to set ILED; requires Kelvin connection to RSET. |
| B2 | DIM | PWM modulation input (0–100kHz); logic-level compatible; internal 383kΩ pull-down enables default-off behavior. |
| B3 | IN | Main input supply connection; requires local 1µF ceramic capacitor placed adjacent to pin per layout guidelines. |
| C1 | SET | Current-sense feedback node; connects to RSET to ground; voltage regulated at 200mV ±5% to define ILED = 200mV/RSET. |
| C2 | EN | Enable control input; logic-high activates device with soft-start; logic-low disables all switching and isolates OUT from IN. |
| C3 | AGND | Analog ground reference for SET, DIM, EN; must connect to PGND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost architecture | Eliminates external Schottky diode, improving efficiency by ~10% and reducing thermal load in compact layouts. |
| Internal soft-start | Ramps average input current from zero to 160mA in 470µs (typ), preventing VIN rail collapse during startup in battery-fed systems. |
| True shutdown isolation | Disconnects OUT from IN and disables current sink, ensuring zero LED leakage current when EN = low. |
| Integrated OVP and short-circuit protection | Clamps VOUT ≤21.8V and limits short-circuit current to 35mA, enabling robust operation in unattended portable applications. |
| Accurate current regulation | Maintains ±5% ILED tolerance across temperature (−30°C to +85°C) and input voltage, supporting consistent display luminance. |
Applications
| Smartphone Backlighting | Digital Camera Flash/Preview |
|---|---|
Use Scenario: Driving 4-series white LEDs for LCD backlight in space-constrained smartphone bezels powered by 3.6V Li-ion battery. IC Role / Device Role / Timing Role: Constant-current synchronous boost driver regulating ILED = 20–30mA with PWM dimming up to 100kHz for flicker-free brightness control. Use Value: Enables ultra-thin form factor via 1.5mm² DSBGA package and eliminates Schottky diode, reducing BOM count and thermal footprint. | Use Scenario: Providing adjustable LED current for camera preview illumination and flash assist in compact digital cameras. IC Role / Device Role / Timing Role: High-accuracy current source delivering stable 30mA to LED string while supporting rapid on/off transitions via DIM pin. Use Value: ±5% current regulation ensures consistent preview brightness across battery discharge; 850kHz switching minimizes EMI near image sensor circuits. |
| Portable Medical Display | Wearable Device UI Lighting |
Use Scenario: Powering monochrome OLED or transflective LCD backlights in battery-operated medical monitors requiring long runtime and reliability. IC Role / Device Role / Timing Role: Efficient boost converter with true shutdown isolation and over-voltage protection, operating from 2.7–5.5V input range. Use Value: <1µA shutdown current extends battery life; 17.5V OVP safeguards against capacitor failure in safety-critical environments. | Use Scenario: Illuminating status indicators or small segment displays in wrist-worn fitness trackers with tight thermal and size constraints. IC Role / Device Role / Timing Role: Low-profile LED driver supporting PWM dimming down to 1% duty cycle while maintaining regulation accuracy. Use Value: 0.6mm height DSBGA package fits under curved casings; internal compensation eliminates need for external RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61160DRVR | Higher 1.2MHz switching frequency; lower 1.8V min input; no integrated OVP clamp (requires external circuit) | Supports lower-voltage inputs (e.g., 2xAA alkaline), but lacks built-in 17.5V OVP - increases design complexity for open-load protection | Choose TPS61160DRVR only if input voltage may drop below 2.7V and external OVP implementation is acceptable. |
| MAX1910ETE+ | Fixed 1.2MHz frequency; ±3% current accuracy; no short-circuit protection; 10-pin TDFN package (3mm × 3mm) | Larger footprint and missing output fault protections limit suitability for ruggedized portable designs | Select MAX1910ETE+ only when highest current accuracy (±3%) is prioritized over protection features and board area. |
Compared with TPS61160DRVR and MAX1910ETE+, the LM3508TL/NOPB delivers superior system-level robustness through integrated OVP, short-circuit recovery, and true shutdown isolation - all within a 1.5mm² footprint - making it optimal for space- and reliability-constrained Li-ion portable applications.
Availability
LM3508TL/NOPB is available at Aetrix Electronics and suitable for smartphone backlighting, digital camera preview lighting, and portable medical display applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3508TL/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 high-efficiency DC/DC conversion and precision analog signal chains.
The LM3508TL/NOPB belongs to TI's white LED driver product line, engineered specifically for compact, battery-powered portable devices where efficiency, small size, and integrated protection are critical design requirements.
FAQ
What is the maximum LED current supported by the LM3508TL/NOPB?
The LM3508TL/NOPB supports up to 30mA LED current when configured with RSET = 6.67Ω (ILED = 200mV / RSET). This is verified across the full −30°C to +85°C ambient temperature range and 2.7V–5.5V input voltage range, with ±5% regulation accuracy. Higher currents require verifying inductor saturation and thermal limits per the datasheet's peak current limit equations.
Does the LM3508TL/NOPB require an external Schottky diode?
No, the LM3508TL/NOPB does not require an external Schottky diode. It integrates both NMOS and PMOS power switches in a synchronous boost topology, using the PMOS as a synchronous rectifier. This eliminates conduction losses associated with external diodes and improves peak efficiency to >80%, as confirmed in the SNVS494C datasheet.
What is the function of the SET pin on the LM3508TL/NOPB?
The SET pin on the LM3508TL/NOPB is the current-sense feedback node where a precision resistor (RSET) is connected to PGND. The internal amplifier regulates voltage at this pin to 200mV ±5%, thereby setting the LED current as ILED = 200mV / RSET. Layout best practice requires Kelvin routing: positive end to ILED, negative end directly to PGND near the IC.
How does the DIM pin control brightness on the LM3508TL/NOPB?
The DIM pin on the LM3508TL/NOPB accepts a logic-level PWM signal (up to 100kHz) that modulates the internal 200mV reference through an integrated RC filter (~500Hz cutoff). This adjusts VSET proportionally to duty cycle, resulting in ILED = D × 200mV / RSET. A logic low disables the current sink (but not the boost converter), while a logic high enables full current.
What protection features are integrated into the LM3508TL/NOPB?
The LM3508TL/NOPB integrates output over-voltage protection (17.5V–21.8V trip), output short-circuit protection (shuts down switching when VOUT < VIN × 0.93, limiting current to 35mA), thermal shutdown (>150°C), and true shutdown isolation (<1µA IQ, OUT disconnected from IN). These are documented in Sections 7–9 of SNVS494C and validated across production units.
LM3508TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 9-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 17.5V
- Current - Output / Channel:
- 30mA
- Frequency:
- 850kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-DSBGA
LM3508TL/NOPB FAQ
1.How can I place an order for LM3508TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3508TL/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 LM3508TL/NOPB reliable?
The price and inventory of LM3508TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3508TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM3508TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3508TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3508TL/NOPB?
LM3508TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3508TL/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 LM3508TL/NOPB?
For technical support, including LM3508TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3508TL/NOPB requirements.
6.How does Aetrix verify that LM3508TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3508TL/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 LM3508TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM3508TL/NOPB?
All LM3508TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3508TL/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 LM3508TL/NOPB part is unused and in its original packaging.
Return procedure for LM3508TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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