My Inquiry
My Account
Texas Instruments LM3501TLX-16/NOPB
- Part No.:
- LM3501TLX-16/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 8-WFBGA
- Datasheet:
-
LM3501TLX-16/NOPB.pdf
- Description:
- IC LED DRIVER RGLTR 400MA 8DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,856
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM3501TLX-16/NOPB from Texas Instruments is a synchronous step-up DC/DC converter optimized for white LED backlighting, featuring 1 MHz fixed-frequency PWM control, 15.5 V internal overvoltage protection (OVP), and analog/PWM dimming via CNTRL and SHDN pins. It operates from 2.7 V to 7 V input, delivers up to 16 V output, and drives 3–4 series white LEDs in handheld displays.
For engineers reviewing the LM3501TLX-16/NOPB datasheet, LM3501TLX-16/NOPB pinout, LM3501TLX-16/NOPB application, or LM3501TLX-16/NOPB equivalent, key selection criteria include OVP threshold accuracy (15.5 V typ.), feedback voltage (0.515 V typ.), shutdown current (0.1 µA), synchronous switch RDS(ON) (NMOS: 0.43 Ω, PMOS: 1.3–2.3 Ω), and 8-bump DSBGA package thermal performance (θJA = 75 °C/W).
Technical Context
The LM3501TLX-16/NOPB employs current-mode PWM control with internal compensation, eliminating external loop components. Its synchronous rectification architecture integrates NMOS and PMOS power switches-VSW serves as the shared drain node, while VOUT connects to the PMOS source-enabling high efficiency without an external Schottky diode.
Protection circuitry includes input undervoltage lockout (UVP: 2.4–2.6 V ON threshold), thermal shutdown (150 °C trip, 35 °C hysteresis), and output overvoltage protection with 900 mV hysteresis (14.6–15.5 V regulation band). The FB pin sets LED current via a resistor to GND, with VFB varying from 0.14 V to 0.545 V depending on CNTRL voltage (0–2.7 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output OVP Threshold | 15.5 V typical - enables use of compact 16 V ceramic output capacitors and prevents destructive overvoltage during LED open-circuit faults. |
| Feedback Voltage (VFB) | 0.515 V typical at CNTRL = 2.7 V - sets precise LED current via external FB-to-GND resistor; low value minimizes power loss in current-sense network. |
| Switching Frequency | 1.0 MHz typical - allows small external inductors (e.g., 22 µH) and ceramic capacitors while maintaining low EMI in portable layouts. |
| NMOS RDS(ON) | 0.43 Ω typical at VIN = 2.7 V, 300 mA - reduces conduction loss and improves efficiency in low-input-voltage battery operation (e.g., single-cell Li-ion). |
| Shutdown Current | 0.1 µA typical - ensures near-zero battery drain in standby mode for extended device shelf life and low-power display retention. |
| Duty Cycle Limit | 87 % typical - constrains maximum on-time to prevent inductor saturation and maintain stable current-mode control under heavy loads. |
| Input Voltage Range | 2.7 V to 7.0 V - supports single-cell Li-ion (2.7–4.2 V), 3-cell NiMH (3.0–4.5 V), and regulated 3.3 V/5 V rails without external LDO pre-regulation. |
Pinout & Package
LM3501TLX-16/NOPB uses an 8-bump thin DSBGA package (1.6 mm × 1.6 mm, 0.5 mm pitch) with bottom-side solder balls. Thermal performance is optimized via direct die attachment to PCB ground plane through GND (C3) and AGND (A1) pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 | AGND | Analog ground reference - must be tied directly to power GND (C3) with minimal trace length to avoid noise coupling into feedback path. |
| B1 | VIN | Main power input - requires local 1 µF ceramic bypass capacitor between VIN and GND to suppress switching noise and stabilize regulation. |
| C1 | VOUT | PMOS source output - connects to cathodes of series white LEDs and output capacitor; high-current path requiring short, wide traces. |
| C2 | VSW | Shared drain node of NMOS/PMOS switches - critical high-di/dt node; inductor must connect here with minimal loop area to reduce EMI radiation. |
| C3 | GND | Power ground - primary return path for inductor current and output capacitor discharge; must connect to solid ground plane. |
| B3 | FB | Feedback input - sets LED current via resistor to GND; sensitive analog node requiring shortest possible trace and no routing near noisy signals. |
| A3 | CNTRL | Analog dimming control - 0–2.7 V input adjusts LED current linearly; 125 mV threshold enables regulation, 75 mV disables output. |
| A2 | SHDN | Digital shutdown/PWM dimming - <0.3 V disables IC with full input-output isolation; >1.1 V enables; PWM at 200–500 Hz enables µA-level dimming resolution. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode - reduces component count, board area, and forward-voltage losses, enabling >85% efficiency at 20 mA per LED. |
| True shutdown isolation | 0.1 µA quiescent current and complete input-output disconnect - prevents LED leakage current and preserves battery life in off-state. |
| Integrated OVP with hysteresis | 15.5 V / 14.6 V (900 mV hysteresis) - protects output capacitors and downstream circuitry during LED string open-circuit events without external Zener. |
| Internal current-mode PWM controller | No external compensation required - simplifies design, improves transient response to LED load changes, and enhances stability across temperature and input voltage. |
| Thermal shutdown with hysteresis | 150 °C trip / 115 °C recovery - prevents permanent damage during sustained overload or poor PCB thermal design while allowing automatic recovery. |
Applications
| Handheld Display Backlighting | Digital Camera LCD Bias |
|---|---|
|
Use Scenario: Powering 3–4 series white LEDs in QVGA or VGA LCD modules of smartphones and PDAs using single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Step-up DC/DC converter providing regulated constant-current drive with analog dimming via CNTRL pin voltage scaling. Use Value: Enables uniform brightness control from 0–100% using only one external resistor and analog voltage, avoiding PWM-induced flicker in camera preview modes. |
Use Scenario: Supplying bias voltage and current to small-format TFT-LCDs in compact digital cameras with tight space constraints. IC Role / Device Role / Timing Role: High-efficiency boost converter delivering stable 12–15 V output to LCD panel while supporting rapid on/off sequencing via SHDN pin. Use Value: Achieves >87% efficiency at 15 mA load with 22 µH inductor and 1 µF ceramic caps - minimizes heat rise and extends battery runtime per shot. |
| Portable Media Player UI Lighting | Medical Handheld Device Displays |
|
Use Scenario: Driving monochrome or color STN/TFT backlights in MP3 players and e-readers operating from 3.0 V NiMH or Li-ion sources. IC Role / Device Role / Timing Role: Constant-current LED driver with dual dimming interface - analog (CNTRL) for smooth brightness ramps and PWM (SHDN) for discrete level selection. Use Value: Supports 200–500 Hz PWM dimming with µA-level current resolution - eliminates visible flicker while enabling ultra-low-power night-mode operation. |
Use Scenario: Providing reliable, low-noise backlighting for diagnostic displays in battery-powered medical instruments requiring long operational life and safety compliance. IC Role / Device Role / Timing Role: Protected boost converter with UVP, OVP, and thermal shutdown - ensures fail-safe operation during battery depletion or thermal stress events. Use Value: Internal 15.5 V OVP and 2.4 V UVP thresholds guarantee safe operation across full battery discharge curve without external supervision circuitry. |
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 |
|---|---|---|---|
| LM3501TLX-21/NOPB | Higher OVP threshold (20.5 V) and duty cycle limit (94 %); supports up to 5-series LEDs. | Required when driving ≥5 white LEDs in series or higher-VF LEDs (e.g., 3.8 V @ 20 mA). | Select LM3501TLX-21/NOPB only if LED string voltage exceeds 12.5 V; otherwise LM3501TLX-16/NOPB offers tighter OVP margin and lower BOM cost. |
| TPS61160DRVR | Fixed 1.2 MHz switching frequency; integrated soft-start; no analog dimming - PWM-only control via EN pin. | Lacks CNTRL pin analog dimming; requires external PWM generator; supports wider input range (2.7–5.5 V). | Choose TPS61160DRVR when system already implements PWM timing control and analog dimming is unnecessary; LM3501TLX-16/NOPB preferred for analog interface simplicity. |
Compared with LM3501TLX-21/NOPB and TPS61160DRVR, LM3501TLX-16/NOPB uniquely combines 15.5 V OVP precision, analog dimming capability, and 0.1 µA shutdown current in an 8-bump DSBGA - making it optimal for space-constrained, battery-sensitive 3–4 LED backlight designs where flicker-free dimming and minimal standby drain are critical.
Availability
LM3501TLX-16/NOPB is available at Aetrix Electronics and suitable for handheld display backlighting, portable medical device UIs, and digital camera LCD bias applications requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for LM3501TLX-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 ICs, with decades of expertise in portable power conversion and LED lighting solutions.
The LM3501 product line was designed specifically for high-efficiency, low-component-count white LED backlighting in battery-powered consumer electronics - emphasizing small footprint, analog/PWM dimming flexibility, and robust fault protection.
FAQ
What is the maximum number of white LEDs the LM3501TLX-16/NOPB can drive in series?
The LM3501TLX-16/NOPB can reliably drive 3–4 white LEDs in series, limited by its 15.5 V OVP threshold and typical LED forward voltage (e.g., ≤3.61 V per LED for 4-LED strings). Equation (3) from the datasheet confirms that (NMAX × VF-MAX) + 0.545 V ≤ 15 V must hold; exceeding this risks OVP activation during normal operation. LM3501TLX-16/NOPB is not rated for 5+ LEDs - use LM3501TLX-21/NOPB instead.
How does the CNTRL pin function in LM3501TLX-16/NOPB dimming control?
The CNTRL pin on LM3501TLX-16/NOPB provides analog dimming: applying 0–2.7 V scales the FB reference voltage from 0.14 V to 0.545 V, directly adjusting LED current. At 125 mV, regulation begins; below 75 mV, output disables fully. This enables smooth, flicker-free brightness control without external PWM circuitry - a key advantage of LM3501TLX-16/NOPB over purely digital alternatives.
Does LM3501TLX-16/NOPB require external compensation components?
No, LM3501TLX-16/NOPB features an internally compensated current-mode PWM controller. The datasheet explicitly states "internally compensated thus eliminating the requirement for any external compensation components," enabling a minimal 6-component solution (inductor, two capacitors, FB resistor, and two LEDs). This simplifies layout, reduces cost, and improves reliability versus externally compensated boost converters.
What is the purpose of the VSW pin on LM3501TLX-16/NOPB?
VSW is the shared drain node of the internal NMOS and PMOS power switches in LM3501TLX-16/NOPB. It carries high di/dt switching current and must connect directly to the inductor with minimal trace length and loop area to suppress EMI. Unlike conventional boost converters, VSW does not connect to ground or output - its voltage swings between near-GND and VOUT, defining the switching node critical for efficiency and noise control.
Can LM3501TLX-16/NOPB operate with input voltages below 2.7 V?
No - LM3501TLX-16/NOPB has a hard input undervoltage lockout (UVP) with 2.4–2.6 V turn-on threshold. Operation below 2.7 V is outside the specified operating conditions and will cause the device to disable. For sub-2.7 V battery operation (e.g., deeply discharged Li-ion), consider TI's TPS6123x family or other ultra-low-VIN boost converters; LM3501TLX-16/NOPB is validated only down to 2.7 V.
LM3501TLX-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 ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DSBGA
LM3501TLX-16/NOPB FAQ
1.How can I place an order for LM3501TLX-16/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3501TLX-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 LM3501TLX-16/NOPB reliable?
The price and inventory of LM3501TLX-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 LM3501TLX-16/NOPB is usually 5 days.
3.What payment methods are accepted for LM3501TLX-16/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3501TLX-16/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3501TLX-16/NOPB?
LM3501TLX-16/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3501TLX-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 LM3501TLX-16/NOPB?
For technical support, including LM3501TLX-16/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3501TLX-16/NOPB requirements.
6.How does Aetrix verify that LM3501TLX-16/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3501TLX-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 LM3501TLX-16/NOPB meets industry standards.
7.What is the process for return or replacement of LM3501TLX-16/NOPB?
All LM3501TLX-16/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3501TLX-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 LM3501TLX-16/NOPB part is unused and in its original packaging.
Return procedure for LM3501TLX-16/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3501TLX-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…
