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Texas Instruments LM3532TMX-40/NOPB
- Part No.:
- LM3532TMX-40/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3532TMX-40/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,200
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Product details
Overview
LM3532TMX-40/NOPB from Texas Instruments is a high-efficiency white LED driver IC with integrated 40-V asynchronous boost converter, three independently programmable low-side current sinks (up to 30 mA each), dual ambient light sensor inputs, and I²C-compatible interface. It delivers up to 90% efficiency in LCD backlight and keypad illumination systems requiring precise multi-string brightness control and adaptive ambient light response.
For engineers reviewing the LM3532TMX-40/NOPB datasheet, LM3532TMX-40/NOPB pinout, LM3532TMX-40/NOPB application, or LM3532TMX-40/NOPB equivalent, key selection considerations include 40-V OVP threshold, 0.4% typical current matching between strings, 256-level logarithmic/linear dimming, 500-kHz fixed-frequency switching, and DSBGA-16 package compatibility with space-constrained portable displays.
Technical Context
The LM3532TMX-40/NOPB integrates a 500-kHz asynchronous boost controller with 250-mΩ internal NMOS switch and regulates output voltage up to 40 V to maintain ≥400 mV headroom across active current sinks. Its adaptive feedback architecture dynamically adjusts VOUT based on the highest-voltage LED string among ILED1–ILED3.
It supports four concurrent control modes: I²C register programming, dual external PWM inputs (PWM1/PWM2), dual ALS inputs (ALS1/ALS2) with 8-bit ADC readback, and hardware enable (HWEN). Current regulation uses independent 5-bit full-scale + 8-bit brightness code mapping with selectable exponential or linear dimming curves.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Up to 40 V - supports high-VF LED strings (e.g., 10× white LEDs @ 3.2 V) without external boost stage |
| Switching Frequency | 500 kHz (±10%) - enables compact external inductor (typically 2.2 µH) and low-profile ceramic capacitors |
| Current Matching | 0.4% typical - ensures uniform luminance across parallel LED strings in display backlighting |
| Dimming Resolution | 256 levels with 14-bit equivalent precision - achieves >1000:1 dimming ratio via logarithmic mapping |
| OVP Threshold | 41 V (typical), 40–42 V (min/max) - protects against open-load failure by disabling boost when output exceeds safe margin |
| ALS Interface | Dual 8-bit ADC with internal 2.44-kΩ gain-select resistors - enables direct ambient light zone detection without external signal conditioning |
| Quiescent Current | 490 µA (typical, active mode) - minimizes standby power in battery-powered handheld devices |
Pinout & Package
LM3532TMX-40/NOPB is housed in a 16-pin, 0.4-mm pitch thin DSBGA package (1.87 mm × 1.77 mm, 0.65 mm height), optimized for ultra-compact portable display modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP | Overvoltage sense input | Connects directly to positive terminal of output capacitor; triggers shutdown if VOUT ≥ 41 V |
| ILED1–ILED3 | Low-side LED current sink terminals | Each sinks up to 30 mA; regulated headroom ≥400 mV ensures stable current under varying VF |
| ALS1 / ALS2 | Ambient light sensor analog inputs | Accept photodiode or resistor-divider signals; internally digitized by 8-bit ADC with programmable gain |
| HWEN | Hardware enable input | Active-high logic input; high-impedance-requires pull-up to enable device; forces POR on low |
| PWM1 / PWM2 | External brightness control inputs | Internal low-pass filtered (540 Hz corner); accept 2–200 kHz PWM for analog-like dimming override |
| INT | Open-drain interrupt output | Pulls low on ALS zone transition; cleared by reading ALS Zone Information register |
| SDA / SCL | I²C bidirectional data/clock | Supports standard/fast-mode I²C (≤400 kHz); requires external pull-ups per bus specification |
| SW | Boost switch node | Connects to external inductor; internal 250-mΩ NMOS switch operates at 500 kHz |
Key Features
| Feature | Design Value |
|---|---|
| Independent string control | Three current sinks assignable to separate I²C control banks (A/B/C) for mixed backlight + keypad + indicator use |
| Programmable ramp rates | Eight startup/shutdown and eight runtime ramp options (8 µs–66 ms/step) prevent LED current overshoot and audible coil whine |
| Dual ALS processing | On-chip algorithms compute weighted average or zone-based response from ALS1/ALS2-enables daylight vs. indoor adaptation |
| Feedback enable/disable | Per-string configuration allows VOUT regulation only where needed-reduces power loss in low-VF strings powered from VIN |
| Thermal protection | Internal shutdown at 140°C (typical) with 15°C hysteresis prevents damage during sustained high-power operation |
Applications
| Mobile Display Backlight | Automotive Infotainment Panel |
|---|---|
Use Scenario: Dual-zone LCD backlight for smartphone or tablet with dynamic contrast adjustment. IC Role / Device Role / Timing Role: Primary LED driver managing three parallel strings (top/bottom/side) with synchronized I²C dimming and ALS-triggered brightness scaling. Use Value: 0.4% current matching eliminates visible banding; 256-level logarithmic dimming matches human eye sensitivity for smooth transitions. | Use Scenario: Dimmable instrument cluster backlight with daylight/night mode auto-switching. IC Role / Device Role / Timing Role: Adaptive LED controller using ALS1 for cabin light and ALS2 for dashboard glare detection-executes zone-based brightness profiles. Use Value: Dual ALS inputs eliminate need for external multiplexer; 40-V capability drives high-brightness automotive LEDs without external boost. |
| Keypad Illumination System | Industrial HMI Display |
Use Scenario: Low-power membrane keypad backlight in medical handheld with wake-on-press functionality. IC Role / Device Role / Timing Role: Standby-current-optimized driver using HWEN for microcontroller-controlled activation and PWM1 for tactile feedback dimming. Use Value: 490 µA quiescent current extends battery life; programmable fade-in/fade-out (8–66 ms) enhances user experience. | Use Scenario: Ruggedized industrial display operating in wide temperature range (−40°C to +85°C). IC Role / Device Role / Timing Role: High-reliability LED driver with thermal shutdown (140°C) and 40-V OVP protecting against field wiring faults. Use Value: DSBGA-16 package withstands mechanical shock; guaranteed operation across full industrial temp range without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX-40/NOPB | Lacks dual ALS inputs; single ALS channel only; no INT pin; identical boost topology and current sink specs | Suitable for cost-sensitive designs needing only one ambient light source | Select LM3530TMX-40/NOPB when dual-sensor adaptive lighting is unnecessary and board area is constrained |
| TPS61165DRVR | Single-output boost LED driver (no multi-string current sinks); 40-V OVP; no ALS or I²C interface; analog/digital dimming only | Used in simpler single-string applications like camera flash or status indicators | Choose TPS61165DRVR for non-backlight roles where independent string control and ambient sensing are not required |
Compared with LM3530TMX-40/NOPB, the LM3532TMX-40/NOPB adds dual ALS inputs and interrupt capability for closed-loop ambient adaptation; versus TPS61165DRVR, it provides three-channel independent regulation and programmable I²C control-making it uniquely suited for multi-zone display backlighting.
Availability
LM3532TMX-40/NOPB is available at Aetrix Electronics and suitable for mobile display backlighting, automotive infotainment panels, and industrial HMI applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3532TMX-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in LED driver innovation for consumer and industrial markets.
The LM3532 product line was designed specifically for high-efficiency, multi-string white LED backlighting in space-constrained portable displays-emphasizing adaptive ambient light response, precise current matching, and robust overvoltage protection.
FAQ
What is the maximum output voltage supported by the LM3532TMX-40/NOPB?
The LM3532TMX-40/NOPB supports a maximum output voltage of 40 V, enforced by its internal overvoltage protection circuitry with a typical trip threshold of 41 V. This allows driving high-voltage LED strings-such as 10-series white LEDs-with sufficient headroom while maintaining regulation across all three current sinks (ILED1–ILED3). The OVP hysteresis is 1 V, ensuring stable recovery after fault clearance.
How does the LM3532TMX-40/NOPB achieve current matching between LED strings?
The LM3532TMX-40/NOPB achieves 0.4% typical current matching between ILED1, ILED2, and ILED3 through matched internal current-sink transistors and shared reference architecture. Matching is verified under conditions of 2.7 V ≤ VIN ≤ 5.5 V and full-scale current = 20.2 mA with brightness code = 0xFF. The device regulates each sink to maintain ≥400 mV headroom, minimizing drift due to process and temperature variation across strings.
Can the LM3532TMX-40/NOPB operate without an I²C host controller?
Yes, the LM3532TMX-40/NOPB can operate without an I²C host controller by using alternative control methods: dual external PWM inputs (PWM1/PWM2), hardware enable (HWEN), or ambient light sensor inputs (ALS1/ALS2). Default power-on reset states configure basic functionality-including preloaded full-scale current and brightness codes-allowing immediate analog or ALS-driven operation upon enabling HWEN.
What is the purpose of the TO pin on the LM3532TMX-40/NOPB?
TO is an unused test input on the LM3532TMX-40/NOPB and must be externally tied to GND for proper device operation. It serves no functional role in normal operation and has no internal connection to active circuitry. Leaving TO floating may cause undefined behavior or reduced noise immunity; TI's datasheet explicitly mandates grounding this pin in all applications.
Does the LM3532TMX-40/NOPB support both linear and logarithmic dimming curves?
Yes, the LM3532TMX-40/NOPB supports both linear and logarithmic (exponential) dimming curves via software-selectable mapping modes in the Brightness Configuration Registers. Logarithmic mode approximates human eye response for perceptually uniform brightness steps across 256 levels; linear mode provides proportional current scaling ideal for calibration-critical applications. Selection is per control bank (A/B/C), enabling mixed-mode operation across strings.
LM3532TMX-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
LM3532TMX-40/NOPB FAQ
1.How can I place an order for LM3532TMX-40/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3532TMX-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 LM3532TMX-40/NOPB reliable?
The price and inventory of LM3532TMX-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 LM3532TMX-40/NOPB is usually 5 days.
3.What payment methods are accepted for LM3532TMX-40/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3532TMX-40/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3532TMX-40/NOPB?
LM3532TMX-40/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3532TMX-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 LM3532TMX-40/NOPB?
For technical support, including LM3532TMX-40/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3532TMX-40/NOPB requirements.
6.How does Aetrix verify that LM3532TMX-40/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3532TMX-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 LM3532TMX-40/NOPB meets industry standards.
7.What is the process for return or replacement of LM3532TMX-40/NOPB?
All LM3532TMX-40/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3532TMX-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 LM3532TMX-40/NOPB part is unused and in its original packaging.
Return procedure for LM3532TMX-40/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3532TMX-40/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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