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Texas Instruments LM3532TME-40/NOPB
- Part No.:
- LM3532TME-40/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3532TME-40/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,087
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Product details
Overview
LM3532TME-40/NOPB from Texas Instruments is a high-efficiency white LED driver IC with integrated 500-kHz asynchronous boost converter, three independent 40-V low-side current sinks (ILED1/2/3), dual ambient light sensor inputs (ALS1/ALS2), and I²C-compatible interface. It delivers up to 90% efficiency, 0.4% typical current matching between strings, and supports 256-level logarithmic/linear dimming with 14-bit equivalent resolution for LCD backlight and keypad illumination.
For engineers reviewing the LM3532TME-40/NOPB datasheet, LM3532TME-40/NOPB pinout, LM3532TME-40/NOPB application, or LM3532TME-40/NOPB equivalent, key selection criteria include programmable 40-V overvoltage protection, 1-A internal NMOS current limit, 400-mV regulated headroom voltage, dual PWM input support with internal low-pass filtering, and 8-bit ALS ADC with zone-based interrupt generation.
Technical Context
The LM3532TME-40/NOPB implements an adaptive current regulation architecture where the boost converter dynamically adjusts output voltage to maintain ≥400 mV headroom across the lowest-voltage active current sink. Its three independently configurable control banks (A/B/C) enable flexible mapping of ILED1–3 to I²C, PWM1/PWM2, or ALS-driven brightness control paths.
Each current sink supports programmable full-scale current (32 settings, up to 30 mA), exponential or linear 8-bit dimming mapping, and user-selectable ramp rates (8 start-up/shutdown and 8 run-time options). The dual ALS inputs feature 128 internal gain-setting resistors, 2.7-V reference, and 154-µs conversion time with 7.84-mV LSB resolution.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Boost Output Voltage | Up to 40 V - enables driving long series strings of white LEDs (e.g., 12× VF=3.2 V) without external HV supply. |
| Switching Frequency | 500 kHz (±10%) - fixed-frequency operation ensures predictable EMI profile and allows compact external inductor (typically 4.7 µH). |
| Current Sink Accuracy | ±0.3% typical - tight regulation ensures consistent luminance across multiple LED strings in display backlighting. |
| Current Matching | ±2% between ILED2/ILED3 - critical for uniform brightness in multi-zone LCD backlights requiring precise string-to-string balance. |
| ALS ADC Resolution | 8-bit with 7.84-mV LSB - provides sufficient granularity for ambient-adaptive brightness control in handheld and automotive displays. |
| OVP Threshold | 40 V ±1 V - protects against open-load failure by disabling switching when output exceeds safe clamp level. |
| Thermal Shutdown | 140°C activation with 15°C hysteresis - prevents permanent damage during sustained high-power operation in enclosed enclosures. |
Pinout & Package
LM3532TME-40/NOPB is housed in a 16-pin, 0.4-mm pitch thin DSBGA package (1.87 mm × 1.77 mm, YFQ suffix), optimized for space-constrained portable display modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP | Output voltage sense input | Connects directly to positive terminal of output capacitor; triggers 40-V overvoltage shutdown to prevent damage during open-load conditions. |
| ILED1/ILED2/ILED3 | Low-side current sink outputs | Each drives one LED string; internally regulated to maintain ≥400 mV headroom-enables independent current control per string. |
| ALS1/ALS2 | Ambient light sensor analog inputs | Accept photodiode or resistor-divider signals; internally sampled by 8-bit ADC with programmable gain for daylight/dark adaptation. |
| HWEN | Hardware enable input | Active-high logic input; must be pulled high (not floating) to activate device; forces POR reset when driven low. |
| PWM1/PWM2 | External brightness control inputs | Accept 2–200 kHz PWM signals; internally filtered to generate analog dimming references for assigned control banks. |
| INT | Open-drain interrupt output | Pulls low when ALS transitions between illumination zones; used to wake host MCU without polling. |
| SDA/SCL | I²C bidirectional data/clock | Support standard-mode (100 kHz) and fast-mode (400 kHz) communication for register read/write and configuration updates. |
| SW | Internal NFET drain node | Connects to external boost inductor; integrates 250-mΩ NMOS switch rated for 1-A peak current. |
Key Features
| Feature | Design Value |
|---|---|
| Dual ALS input with zone detection | Enables context-aware backlight adjustment (e.g., indoor vs. outdoor) using two independent light sensors with programmable thresholds. |
| Independent current sink control | Three control banks (A/B/C) allow separate full-scale current, dimming curve, and ramp rate assignment per LED string-ideal for multi-zone displays. |
| Programmable LED current ramp rates | Eight selectable start-up/shutdown and run-time ramp steps (8 µs to 66 ms/step) eliminate visible flicker during brightness transitions. |
| I²C + dual PWM hybrid control | Permits simultaneous use of digital bus commands and analog PWM signals-supports legacy MCU interfaces while retaining firmware flexibility. |
| 400-mV regulated headroom voltage | Maintains minimum voltage across active current sinks to ensure stable regulation even as LED forward voltage varies with temperature. |
Applications
| Smartphone LCD Backlight | Automotive Instrument Cluster |
|---|---|
Use Scenario: Dynamic backlight control in 5.5-inch AMOLED/LCD panels under varying ambient lighting (0–10,000 lux). IC Role / Device Role / Timing Role: Primary white LED driver managing three parallel backlight strings with ALS1/ALS2 differential sensing for glare-free readability. Use Value: Achieves >1000:1 dimming range via 256-level exponential mapping and 14-bit effective resolution-preserves black levels while maintaining visibility in direct sunlight. |
Use Scenario: Illuminating segmented TFT clusters with distinct brightness zones (speedometer, tachometer, warning icons) in dashboards. IC Role / Device Role / Timing Role: Multi-string LED controller delivering independent current to each zone using Control A/B/C bank assignments and programmable ramp timing. Use Value: Eliminates visual stepping artifacts during ignition-on ramp-up via 8-µs/step startup rate-ensures smooth, professional-grade illumination transition. |
| Industrial HMI Keypad | Medical Display Backlight |
Use Scenario: Backlighting membrane keypads in factory-floor HMIs exposed to oil, dust, and wide temperature swings (−40°C to +85°C). IC Role / Device Role / Timing Role: Robust LED driver with 40-V OVP and thermal shutdown protecting against power rail transients and enclosure overheating. Use Value: Maintains consistent key illumination intensity despite battery voltage sag (2.7–5.5 V input range) and ambient temperature drift-critical for operator safety. |
Use Scenario: Driving high-reliability LED arrays in diagnostic imaging displays requiring flicker-free, DICOM-compliant luminance stability. IC Role / Device Role / Timing Role: Precision current source with 0.4% typical matching and 400-mV headroom regulation ensuring identical brightness across all backlight zones. Use Value: Enables clinical-grade grayscale fidelity by eliminating inter-string luminance variation that could mask subtle contrast differences in X-ray or MRI visuals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TME/NOPB | Lacks ALS inputs and OVP; max output 24 V; only two current sinks; no PWM inputs. | Suitable for simpler, cost-sensitive keypad-only designs without ambient adaptation or high-voltage strings. | Select when system uses external ALS or operates below 24 V-reduces BOM count but sacrifices adaptive lighting and robustness. |
| TPS61165DRVR | Single-channel 40-V boost LED driver; no ALS, no I²C, no multi-string control; 1.2-MHz switching. | Targeted at single-string applications like camera flash or indicator LEDs-not for multi-zone display backlighting. | Choose for high-frequency, low-inductance designs where only one LED string is needed and digital control is unnecessary. |
Compared with LM3530TME/NOPB and TPS61165DRVR, the LM3532TME-40/NOPB uniquely integrates triple-string control, dual ALS, I²C programmability, and 40-V OVP in one DSBGA package-making it the only option for compact, adaptive, multi-zone display backlight systems requiring coordinated brightness management.
Availability
LM3532TME-40/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlight, automotive instrument cluster, industrial HMI keypad, medical display backlight, and portable tablet backlight applications requiring stable component supply and long-term production continuity.
Supply support for LM3532TME-40/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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and interface solutions for industrial, automotive, and consumer markets.
The LM3532TME-40/NOPB belongs to TI's high-efficiency LED driver product line, designed specifically for adaptive backlighting in space-constrained portable and automotive displays requiring precision current matching, ambient light responsiveness, and robust fault protection.
FAQ
What is the maximum output voltage capability of the LM3532TME-40/NOPB?
The LM3532TME-40/NOPB supports up to 40 V on its boost output, verified by its OVP threshold of 40 V ±1 V and absolute maximum rating for VILED1/2/3 to GND. This enables driving high-series-count white LED strings (e.g., 12× 3.2-V LEDs) without external HV supplies. The 40-V rating is intrinsic to the LM3532TME-40/NOPB's internal NMOS switch and feedback architecture-no external components extend this limit.
How does the LM3532TME-40/NOPB achieve current matching between LED strings?
The LM3532TME-40/NOPB achieves 0.4% typical current matching between strings through matched internal current-sink circuitry and adaptive regulation that maintains ≥400 mV headroom across all active sinks. Measured matching between ILED2 and ILED3 is ±2% under full-scale conditions (20.2 mA), with tighter matching enabled by assigning all sinks to the same control bank-a capability confirmed in the LM3532TME-40/NOPB's Electrical Characteristics table.
Can the LM3532TME-40/NOPB operate without an I²C host controller?
Yes, the LM3532TME-40/NOPB supports standalone operation using its dual PWM inputs (PWM1/PWM2) and hardware enable (HWEN) pin. When HWEN is high and I²C is unused, brightness can be controlled entirely via externally generated PWM signals mapped to control banks A/B/C. The LM3532TME-40/NOPB retains full functionality-including ALS zone interrupts and current ramping-without I²C communication.
What ambient light sensor interface capabilities does the LM3532TME-40/NOPB provide?
The LM3532TME-40/NOPB integrates two dedicated ALS inputs (ALS1/ALS2) with internal 8-bit ADC, 128 programmable gain-setting resistors, 2.7-V reference, and 154-µs conversion time. It supports zone-based interrupt generation (via INT pin) when illumination crosses programmable thresholds-enabling responsive, low-power ambient adaptation without host MCU polling. This ALS functionality is fully specified and tested for the LM3532TME-40/NOPB across −40°C to +85°C.
What thermal protection features are built into the LM3532TME-40/NOPB?
The LM3532TME-40/NOPB includes internal thermal shutdown that activates at 140°C (typical) with 15°C hysteresis, plus junction temperature monitoring up to 125°C operating limit. Its DSBGA package has RθJA = 61.3°C/W, and the device disables switching during overtemperature events to prevent permanent damage. These protections are documented in the LM3532TME-40/NOPB's Absolute Maximum Ratings and Thermal Information sections.
LM3532TME-40/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 30mA
- Frequency:
- 500kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-DSBGA
LM3532TME-40/NOPB FAQ
1.How can I place an order for LM3532TME-40/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3532TME-40/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 LM3532TME-40/NOPB reliable?
The price and inventory of LM3532TME-40/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3532TME-40/NOPB is usually 5 days.
3.What payment methods are accepted for LM3532TME-40/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3532TME-40/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3532TME-40/NOPB?
LM3532TME-40/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3532TME-40/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 LM3532TME-40/NOPB?
For technical support, including LM3532TME-40/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3532TME-40/NOPB requirements.
6.How does Aetrix verify that LM3532TME-40/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3532TME-40/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 LM3532TME-40/NOPB meets industry standards.
7.What is the process for return or replacement of LM3532TME-40/NOPB?
All LM3532TME-40/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3532TME-40/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 LM3532TME-40/NOPB part is unused and in its original packaging.
Return procedure for LM3532TME-40/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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