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Texas Instruments LM3532TMX-40A/NOPB
- Part No.:
- LM3532TMX-40A/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3532TMX-40A/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 16DSBGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3532TMX-40A/NOPB from Texas Instruments is a high-efficiency, I²C-programmable white LED driver with dual ambient light sensing, driving up to three 40-V LED strings at ≤30 mA each with 0.4% typical current matching and 400-mV regulated headroom voltage. It integrates a 500-kHz asynchronous boost converter, programmable ramp rates (8-step), and 256-level logarithmic/linear dimming for LCD backlight and keypad illumination.
For engineers reviewing the LM3532TMX-40A/NOPB datasheet, LM3532TMX-40A/NOPB pinout, LM3532TMX-40A/NOPB application, or LM3532TMX-40A/NOPB equivalent, key selection considerations include its 40-V OVP threshold, independent per-string current control via three programmable banks, dual ALS inputs with internal 2.44-kΩ gain resistors, 1-A NMOS switch current limit, and DSBGA-16 package compatibility with space-constrained portable displays.
Technical Context
The LM3532TMX-40A/NOPB implements an asynchronous boost architecture with integrated 250-mΩ NMOS switch and three low-side current sinks, each independently configurable for feedback enable/disable to manage headroom across mixed LED string configurations. Its adaptive regulation maintains ≥400 mV across active sinks while supporting open-load OVP protection at 40 V with 1-V hysteresis.
Control is delivered through four concurrent modes: I²C register programming (24-bit address space), dual PWM inputs (2–200 kHz compatible), dual ambient light sensor inputs with 8-bit ADC readback, and hardware enable (HWEN) with shutdown current <2 µA. All three current sinks map to one of three control banks, enabling flexible grouping for backlight + keypad + indicator use cases.
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. |
| LED Current Range | 0–30 mA per string - 32 programmable full-scale settings per bank, enabling precise current tailoring per display zone. |
| Current Matching | ±0.4% typical - ensures uniform luminance across parallel LED strings in multi-zone backlights. |
| Dimming Resolution | 256-level logarithmic/linear - delivers 14-bit-equivalent perceptual dimming control with fade-in/fade-out timing. |
| Switching Frequency | 500 kHz (±10%) - enables compact external magnetics (e.g., 1.5-µH inductor) and reduces audible noise vs. lower-frequency drivers. |
| OVP Threshold | 40 V ±1 V - protects output capacitor and LEDs during open-circuit or thermal shutdown events. |
| I²C Timing | tCLK ≥2.5 µs - supports standard/fast-mode I²C (≤400 kHz) with glitch-free brightness updates. |
Pinout & Package
LM3532TMX-40A/NOPB uses a 16-pin, 0.4-mm pitch thin DSBGA (YFQ) package measuring 1.87 mm × 1.77 mm, optimized for ultra-compact portable display modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP | Overvoltage sense input | Direct connection to output capacitor anode; triggers shutdown if VOUT ≥40 V to prevent capacitor overvoltage. |
| ILED1–ILED3 | Low-side LED current sink terminals | Each sinks up to 30 mA; regulated headroom ≥400 mV ensures stable current even with varying LED forward voltage. |
| ALS1 / ALS2 | Ambient light sensor analog inputs | Accept photodiode or resistor-divider signals; internal 2.44-kΩ pulldown enables direct connection to unbuffered ALS elements. |
| HWEN | Hardware enable input | Active-high logic input; pulls device into <2 µA shutdown state when low, resetting all registers to POR defaults. |
| PWM1 / PWM2 | External brightness control inputs | Internal low-pass filtered (540 Hz corner); accept 2–200 kHz PWM for analog-like dimming without I²C traffic. |
| INT | Open-drain interrupt output | Pulls low on ALS zone transition; signals firmware to read updated ALS Zone Information register (bit 3 flag). |
| SDA / SCL | I²C bidirectional data/clock | Supports multi-master bus sharing; requires external pullups; tolerates VIN-supplied logic levels (1.2–VIN V). |
| SW | Boost switch node | Connects to external inductor; internal 250-mΩ NMOS switch operates at 500 kHz with 1-A peak current limit. |
Key Features
| Feature | Design Value |
|---|---|
| Dual ALS input processing | On-chip 8-bit ADC with averaging, zone-based algorithms, and direct register readback eliminates external signal conditioning. |
| Independent control bank mapping | Three current sinks assignable to Control A/B/C banks-enables simultaneous backlight (Bank A), keypad (Bank B), and status LED (Bank C) control. |
| Programmable ramp timing | 8 discrete ramp rates (8 µs–66 ms/step) for startup, shutdown, and runtime brightness transitions-reduces visual flicker and EMI. |
| Feedback enable/disable per sink | Selective disable allows VIN-powered strings (e.g., short LED chains) while retaining boost regulation for high-VF strings-optimizes efficiency. |
| 40-V overvoltage protection | Hysteresis-controlled shutdown prevents capacitor stress during open-load conditions-no external OVP circuit required. |
Applications
| Smartphone LCD Backlight | Automotive Infotainment Display |
|---|---|
Use Scenario: Dynamic backlight control in OLED/LCD panels under varying ambient light (0–100,000 lux). IC Role / Device Role / Timing Role: Primary LED driver managing three independent zones (top/bottom/side) with ALS-triggered dimming curves. Use Value: Maintains consistent screen contrast and power efficiency across daylight-to-night conditions using dual ALS inputs and 256-level exponential mapping. |
Use Scenario: High-reliability dashboard display backlighting operating from 12-V automotive supply with wide temperature range. IC Role / Device Role / Timing Role: Boost-based LED driver delivering stable 30-mA current to 40-V LED strings despite input ripple and cold-crank transients. Use Value: 40-V OVP and −40°C to +125°C junction operation ensure robustness; HWEN enables microcontroller-coordinated sleep/wake sequencing. |
| Tablet Keypad Illumination | Industrial HMI Panel |
Use Scenario: Low-power capacitive keypad backlight activated only during user interaction in battery-powered tablets. IC Role / Device Role / Timing Role: Secondary current sink (ILED2) driven by PWM1 with fast 8-µs ramp-up for instant visual feedback. Use Value: Independent bank control allows keypad dimming without affecting main display brightness; <2 µA shutdown current extends battery life. |
Use Scenario: Ruggedized human-machine interface with sunlight-readable display requiring consistent luminance in factory environments. IC Role / Device Role / Timing Role: Dual ALS inputs (ALS1 for front panel, ALS2 for enclosure ambient) feed weighted algorithm for adaptive brightness compensation. Use Value: Internal ALS gain selection and 0.4% current matching eliminate manual calibration; DSBGA package withstands vibration and thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3530TMX-40A/NOPB | Lacks dual ALS inputs; single ALS channel and no INT pin; identical boost topology and 3-sink architecture. | Suitable for cost-sensitive designs where only one ambient light source requires monitoring. | Select LM3530TMX-40A/NOPB when ALS redundancy is unnecessary and PCB layout must minimize routing complexity. |
| TPS61165DRVR | Single-output boost LED driver (1 string); no I²C, no ALS, no PWM inputs; fixed 1.2-MHz switching frequency. | Targeted at simple monochrome display backlights without adaptive control requirements. | Choose TPS61165DRVR only for non-adaptive, single-string applications where size and BOM count outweigh programmability needs. |
Compared with LM3530TMX-40A/NOPB, the LM3532TMX-40A/NOPB adds dual ALS support and interrupt signaling for closed-loop ambient adaptation; versus TPS61165DRVR, it provides triple-string control, I²C configurability, and programmable dimming-making it essential for multi-zone, intelligent backlight systems.
Availability
LM3532TMX-40A/NOPB is available at Aetrix Electronics and suitable for smartphone LCD backlight, automotive infotainment display, and industrial HMI panel designs requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3532TMX-40A/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 and embedded processing technologies, with decades of expertise in power management ICs for consumer, automotive, and industrial markets.
The LM3532TMX-40A/NOPB belongs to TI's high-efficiency LED driver product line, engineered specifically for adaptive backlighting in portable and automotive displays where precision current matching, ambient light responsiveness, and compact packaging are critical.
FAQ
What is the maximum output voltage supported by the LM3532TMX-40A/NOPB?
The LM3532TMX-40A/NOPB supports a maximum output voltage of 40 V, enforced by its internal overvoltage protection circuitry tied to the OVP pin. This allows direct driving of high-forward-voltage LED strings-such as 10-series white LEDs-without requiring additional external regulation stages. The 40-V threshold includes 1-V hysteresis to prevent oscillation during transient overvoltage events.
How does the LM3532TMX-40A/NOPB achieve current matching between LED strings?
The LM3532TMX-40A/NOPB achieves 0.4% typical current matching between ILED1, ILED2, and ILED3 by using matched internal current-sink transistors and a shared reference architecture. Matching is verified under conditions of 2.7–5.5 V input and full-scale current = 20.2 mA with brightness code = 0xFF. The device regulates each sink to maintain ≥400 mV headroom, minimizing process- and temperature-induced drift across strings.
Can the LM3532TMX-40A/NOPB operate without an I²C host controller?
Yes, the LM3532TMX-40A/NOPB can operate without an I²C host controller by using its dual PWM inputs (PWM1/PWM2) or hardware enable (HWEN) with preconfigured internal registers. Default power-on settings allow basic functionality-such as fixed-current drive and ALS-based dimming-immediately after enabling HWEN, eliminating mandatory firmware initialization for simple applications.
What ambient light sensor configurations are supported by the LM3532TMX-40A/NOPB?
The LM3532TMX-40A/NOPB supports two independent ambient light sensor inputs (ALS1 and ALS2), each with programmable internal gain resistors (default 2.44 kΩ) and an 8-bit ADC for direct digital readback. Sensor inputs accept either photodiode current or resistor-divider voltage signals, and firmware can apply zone-based algorithms-such as weighted averaging or differential thresholding-to generate adaptive brightness commands.
What is the purpose of the INT pin on the LM3532TMX-40A/NOPB?
The INT pin on the LM3532TMX-40A/NOPB is an open-drain interrupt output that pulls low when either ALS1 or ALS2 transitions into a new illumination zone-indicating a significant ambient light change. This event simultaneously updates the ALS Zone Information register and sets bit 3 (software flag). Reading that register clears the flag and releases INT, enabling efficient polling-free firmware response to lighting environment shifts.
LM3532TMX-40A/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-40A/NOPB FAQ
1.How can I place an order for LM3532TMX-40A/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3532TMX-40A/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-40A/NOPB reliable?
The price and inventory of LM3532TMX-40A/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-40A/NOPB is usually 5 days.
3.What payment methods are accepted for LM3532TMX-40A/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3532TMX-40A/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3532TMX-40A/NOPB?
LM3532TMX-40A/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3532TMX-40A/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-40A/NOPB?
For technical support, including LM3532TMX-40A/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3532TMX-40A/NOPB requirements.
6.How does Aetrix verify that LM3532TMX-40A/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3532TMX-40A/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-40A/NOPB meets industry standards.
7.What is the process for return or replacement of LM3532TMX-40A/NOPB?
All LM3532TMX-40A/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3532TMX-40A/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-40A/NOPB part is unused and in its original packaging.
Return procedure for LM3532TMX-40A/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3532TMX-40A/NOPB Tags
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