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Texas Instruments LM3501TL-16/NOPB
- Part No.:
- LM3501TL-16/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-WFBGA
- Datasheet:
-
LM3501TL-16/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 400MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
LM3501TL-16/NOPB from Texas Instruments is a synchronous step-up DC/DC converter optimized for white LED backlighting in portable displays. It delivers up to 16 V output with 1 MHz fixed-frequency PWM control, integrated NMOS/PMOS switches (RDSON = 0.43 Ω / 1.3–2.3 Ω), and analog/PWM LED current regulation via CNTRL and SHDN pins - enabling precise brightness control in handheld devices and digital cameras.
For engineers reviewing the LM3501TL-16/NOPB datasheet, LM3501TL-16/NOPB pinout, LM3501TL-16/NOPB application, or LM3501TL-16/NOPB equivalent, key selection criteria include its 15.5 V OVP threshold, 2.7–7.0 V input range, 0.1 µA shutdown current, 8-bump DSBGA package, and compatibility with ceramic input/output capacitors (1 µF) for compact, low-noise LED bias supplies.
Technical Context
The LM3501TL-16/NOPB employs a synchronous current-mode PWM architecture with internal compensation, eliminating external loop components. Its feedback voltage is programmable (0.14–0.545 V) via the CNTRL pin, directly scaling LED current without external DACs or op-amps.
Protection circuitry includes input undervoltage lockout (2.4–2.6 V ON threshold), thermal shutdown (150°C trip), and output overvoltage protection with hysteresis (15.5 V ON / 14.6 V OFF). The device achieves true shutdown isolation - disconnecting VIN from VOUT and reducing supply current to 0.1 µA while blocking LED leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage Limit | 15.5 V (typical OVP activation); enables use of 16 V-rated ceramic output capacitors |
| Input Voltage Range | 2.7 V to 7.0 V; supports single-cell Li-ion (3.0–4.2 V) and 3-cell NiMH (3.6 V) battery inputs |
| Switching Frequency | 1.0 MHz (±15%); allows small inductors (e.g., 22 µH) and minimizes EMI in space-constrained layouts |
| Feedback Voltage Range | 0.14 V to 0.545 V; set by CNTRL pin voltage (75–125 mV threshold for LED on/off), enabling analog dimming |
| Shutdown Current | 0.1 µA (max); ensures zero-load battery drain during system sleep in portable applications |
| Current Limit | 400 mA (typ. at VIN = 3.0 V, 70% duty cycle); defines maximum peak inductor current for reliability |
| Package | 8-bump thin DSBGA (1.6 mm × 1.6 mm, 0.5 mm pitch); surface-mount compatible with fine-pitch PCB assembly |
Pinout & Package
LM3501TL-16/NOPB uses an 8-bump thin DSBGA package (1.6 mm × 1.6 mm, 0.5 mm pitch) with bottom-side solder bumps. Thermal performance is optimized via direct die-to-PCB conduction through the GND bump array.
| 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 (2.7–7.0 V); requires local 1 µF ceramic bypass capacitor between VIN and GND |
| C1 | VOUT | PMOS source node; connects to output capacitor and LED string anode; carries full LED load current |
| C2 | VSW | Switch node (NMOS drain / PMOS drain); high di/dt node requiring shortest possible trace to inductor |
| C3 | GND | Power ground; primary return path for inductor current and LED current; ties to PCB ground plane |
| B3 | FB | Feedback input; sets LED current via resistor to GND; sensitive to layout - keep trace short and away from noise |
| A3 | CNTRL | Analog dimming input; 0–2.7 V range adjusts FB voltage linearly (0.191 × CNTRL), enabling smooth brightness control |
| A2 | SHDN | Active-high enable; <0.3 V disables converter with 0.1 µA quiescent current; >1.1 V enables; accepts PWM for digital dimming |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves efficiency by ~8% vs. asynchronous designs |
| Integrated OVP with hysteresis | 15.5 V / 14.6 V thresholds prevent destructive overvoltage when LEDs open; enables safe use of 16 V ceramic capacitors |
| True shutdown isolation | Zero current path from VIN to VOUT and LEDs; prevents standby battery drain and unintended LED glow |
| Single-resistor LED current setting | ILED = VFB / RLED; simplifies BOM and eliminates trimming; supports 15–60 mA typical LED currents |
| Thermal shutdown with hysteresis | 150°C trip / 115°C recovery; protects IC under sustained overload or poor PCB thermal design |
Applications
| LCD Bias Supplies | White LED Back-Lighting |
|---|---|
|
Use Scenario: Powering 3–4 series white LEDs in a 3.5-inch TFT LCD panel for a handheld medical monitor. IC Role / Device Role / Timing Role: Step-up converter regulating constant current to LED string; provides stable 12–15 V output from 3.6 V NiMH battery. Use Value: Enables uniform brightness across display with <1% current variation over temperature; 1 MHz switching avoids audible noise in sensitive environments. |
Use Scenario: Driving 4-series white LEDs in a digital camera viewfinder with analog dimming via microcontroller DAC. IC Role / Device Role / Timing Role: Constant-current LED driver with CNTRL pin accepting 0–2.7 V analog signal for seamless brightness ramping. Use Value: Achieves 100:1 dimming ratio without PWM flicker; 0.1 µA shutdown current extends battery life during idle periods. |
| Handheld Devices | Digital Cameras |
|
Use Scenario: Compact LED backlight for a ruggedized PDA with limited board area and strict EMI limits. IC Role / Device Role / Timing Role: Synchronous boost converter operating at 1 MHz to minimize inductor size; uses only 1 µF ceramic caps on input/output. Use Value: Reduces total solution footprint to <12 mm²; low EMI due to synchronous topology meets Class B FCC requirements. |
Use Scenario: Flash-assisted auto-focus illumination using 3-series white LEDs triggered by shutter button press. IC Role / Device Role / Timing Role: Fast-starting LED driver activated via SHDN pin with 200 Hz PWM for controlled flash intensity. Use Value: Full LED current reached in <100 µs (Fig. 29); 400 mA current limit prevents inrush damage to LEDs during burst mode. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3502TL-16/NOPB | Same 16 V OVP, but adds I²C interface and programmable soft-start; higher quiescent current (2.5 µA vs. 0.1 µA) | Requires MCU firmware support; suited for systems needing dynamic OVP adjustment or fault reporting | Select LM3502TL-16/NOPB only if I²C configurability justifies added complexity and cost; LM3501TL-16/NOPB remains optimal for analog-only, ultra-low-power designs. |
| TPS61160DRVR | 18 V OVP, 1.2 MHz switching, 2.5 µA shutdown current; no analog CNTRL pin - dimming only via PWM on EN | Lacks analog dimming capability; requires external PWM generator; higher minimum input voltage (2.9 V) | Choose TPS61160DRVR only when higher OVP margin or faster switching is critical; LM3501TL-16/NOPB is preferred for analog-dimming simplicity and lowest shutdown current. |
Compared with LM3502TL-16/NOPB and TPS61160DRVR, LM3501TL-16/NOPB uniquely combines ultra-low 0.1 µA shutdown current, analog dimming via CNTRL pin, and minimal external component count - making it the most power-efficient and layout-simple choice for cost-sensitive, battery-operated LED backlighting.
Availability
LM3501TL-16/NOPB is available at Aetrix Electronics and suitable for LCD bias supplies, white LED back-lighting, handheld devices, digital cameras, and portable applications requiring stable component supply and long-term production continuity.
Supply support for LM3501TL-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 LM3501 product line was designed specifically for high-efficiency, space-constrained white LED backlighting in portable consumer electronics - prioritizing low quiescent current, integrated protection, and minimal external component count.
FAQ
What is the maximum number of white LEDs the LM3501TL-16/NOPB can drive in series?
The LM3501TL-16/NOPB can drive up to 4 white LEDs in series when each has a forward voltage ≤3.61 V (e.g., typical 3.4 V at 20 mA), based on its 15.5 V OVP threshold and 0.545 V feedback headroom. Driving 5 LEDs requires VF ≤2.89 V - uncommon for standard white LEDs - so 3–4 LEDs is the practical limit for reliable operation.
How does the CNTRL pin on the LM3501TL-16/NOPB control LED current?
The CNTRL pin on the LM3501TL-16/NOPB sets the feedback reference voltage linearly: VFB = 0.191 × VCNTRL. At 2.7 V CNTRL, VFB ≈ 0.515 V (typ.), enabling full LED current; below 75 mV, the LED current shuts off. This allows smooth analog dimming without external DACs or PWM filtering.
Does the LM3501TL-16/NOPB require external compensation components?
No, the LM3501TL-16/NOPB features internal compensation. Its current-mode PWM control loop is fully stabilized without external RC networks or compensation capacitors - reducing BOM count and layout sensitivity while maintaining stability across input voltage and load variations.
What is the purpose of the VSW pin on the LM3501TL-16/NOPB?
The VSW pin on the LM3501TL-16/NOPB is the switch node connecting the drains of both the internal NMOS (high-side) and PMOS (synchronous rectifier) power devices. It carries high di/dt current during switching and must be routed with minimal loop area to suppress EMI and ensure reliable operation.
Can the LM3501TL-16/NOPB operate with a 2.5 V input supply?
No - the LM3501TL-16/NOPB has a 2.4–2.6 V undervoltage lockout (UVP) turn-on threshold. At 2.5 V input, the device may intermittently enable/disable; stable operation requires VIN ≥2.7 V per datasheet specifications. Below 2.7 V, the converter will not regulate or deliver LED current reliably.
LM3501TL-16/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFBGA
- 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):
- 7V
- Voltage - Output:
- 16V
- Current - Output / Channel:
- 400mA (Switch)
- Frequency:
- 1MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
LM3501TL-16/NOPB FAQ
1.How can I place an order for LM3501TL-16/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3501TL-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 LM3501TL-16/NOPB reliable?
The price and inventory of LM3501TL-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 LM3501TL-16/NOPB is usually 5 days.
3.What payment methods are accepted for LM3501TL-16/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3501TL-16/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3501TL-16/NOPB?
LM3501TL-16/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3501TL-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 LM3501TL-16/NOPB?
For technical support, including LM3501TL-16/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3501TL-16/NOPB requirements.
6.How does Aetrix verify that LM3501TL-16/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3501TL-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 LM3501TL-16/NOPB meets industry standards.
7.What is the process for return or replacement of LM3501TL-16/NOPB?
All LM3501TL-16/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3501TL-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 LM3501TL-16/NOPB part is unused and in its original packaging.
Return procedure for LM3501TL-16/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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