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Texas Instruments LM3532TME-40A/NOPB
- Part No.:
- LM3532TME-40A/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-WFBGA, DSBGA
- Datasheet:
-
LM3532TME-40A/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 16DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,082
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Product details
Overview
LM3532TME-40A/NOPB from Texas Instruments is a high-efficiency, I²C-programmable white LED driver with dual ambient light sensing inputs and three independent 40-V current sinks. It delivers up to 90% efficiency at 500-kHz fixed-frequency boost operation, supports 256-level logarithmic/linear dimming, and provides 0.4% typical current matching between strings for precise backlight uniformity in LCD displays.
For engineers reviewing the LM3532TME-40A/NOPB datasheet, LM3532TME-40A/NOPB pinout, LM3532TME-40A/NOPB application, or LM3532TME-40A/NOPB equivalent, key selection considerations include its 40-V OVP threshold, 20.2-mA full-scale current capability per string, programmable ramp rates (8-step), dual PWM input support, and integrated 8-bit ALS ADC with internal gain selection.
Technical Context
The LM3532TME-40A/NOPB integrates a 500-kHz asynchronous boost converter with a 0.25-Ω NMOS switch and three low-side current sinks, each regulated to maintain ≥400 mV headroom voltage. Its adaptive current regulation enables independent control of ILED1–ILED3 via I²C or external PWM inputs (PWM1/PWM2), with feedback enable/disable per sink to optimize VOUT headroom across mixed LED-string configurations.
It features dual ambient light sensor inputs (ALS1/ALS2) with 32 internal resistor settings, 8-bit logarithmic ADC conversion (154 µs), and an open-drain INT pin that asserts on ALS zone transitions. Protection includes 40-V overvoltage detection (1-V hysteresis), 1-A peak current limiting, and thermal shutdown at 140°C with 15°C hysteresis.
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 4.7 µH) and reduces EMI compared to lower-frequency alternatives. |
| Full-Scale Current | 20.2 mA per string - programmable in 32 steps; ensures consistent brightness across multi-string backlight systems. |
| Current Matching | ±0.4% typical - minimizes luminance variation between parallel LED strings, critical for uniform LCD backlighting. |
| I²C Timing | t1 = 2.5 µs min clock period - compatible with standard-mode (100 kHz) and fast-mode (400 kHz) I²C buses. |
| ALS Conversion | 8-bit resolution, 154 µs conversion time - enables real-time ambient-adaptive brightness control with low latency. |
| Thermal Shutdown | 140°C activation, 125°C release - protects against sustained overloads while allowing recovery without system reset. |
Pinout & Package
LM3532TME-40A/NOPB is housed in a 16-pin, 0.4-mm pitch thin DSBGA package (1.87 mm × 1.77 mm), optimized for space-constrained portable display applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OVP | Overvoltage sense input | Monitors output capacitor voltage; triggers shutdown if VOUT exceeds 40 V (±1 V hysteresis). |
| ILED1–ILED3 | Low-side current sink outputs | Each sinks up to 30 mA; regulated to 0.4 V headroom - sets minimum VOUT required for stable current regulation. |
| ALS1 / ALS2 | Ambient light sensor analog inputs | Accept photodiode or resistive ALS signals; internally biased with selectable 2.44-kΩ pulldown for gain control. |
| PWM1 / PWM2 | External brightness control inputs | Accept logic-level PWM (2–200 kHz); filtered internally to generate analog dimming reference for assigned control banks. |
| HWEN | Hardware enable input | Active-high; must be pulled high (e.g., via MCU or pull-up) to activate device - enables system-level power sequencing. |
| INT | Open-drain interrupt output | Asserts low when ALS zone changes; requires external pull-up - signals firmware to read updated ALS Zone Information register. |
| SDA / SCL | I²C-compatible serial interface | Supports bidirectional communication for register configuration, ALS readback, and brightness programming. |
| SW | Boost switch node | Connects to external inductor and diode; carries pulsed current - requires low-inductance layout to minimize switching losses. |
Key Features
| Feature | Design Value |
|---|---|
| Independent string control | Three current sinks assignable to separate I²C control banks (A/B/C), enabling distinct brightness, ramp rate, and mapping per string. |
| Programmable ramp timing | Eight selectable ramp rates (8 µs–66 ms/step) for startup, shutdown, and runtime brightness transitions - eliminates visible flicker during dimming. |
| Dual ALS processing | On-chip averaging and zone-based algorithms using two independent sensor inputs - improves ambient adaptation accuracy in non-uniform lighting. |
| Feedback enable/disable | Per-sink configuration allows VOUT regulation only where needed - avoids excessive voltage drop across low-LED-count strings. |
| 14-bit equivalent dimming | 256-level logarithmic/linear mapping with 5-bit full-scale current scaling - achieves >1000:1 effective dimming ratio for wide dynamic range. |
Applications
| Mobile LCD Backlight | Automotive Infotainment Display |
|---|---|
Use Scenario: Driving 3 parallel white LED strings behind a 7-inch TFT-LCD in a smartphone or tablet, adapting brightness dynamically based on ambient light. IC Role / Device Role / Timing Role: High-voltage LED driver with integrated ALS interface and I²C programmability - manages power delivery, current regulation, and closed-loop ambient compensation. Use Value: Delivers uniform backlighting with <0.4% inter-string current mismatch and 1000:1 dimming range, reducing power consumption by up to 40% in bright environments. |
Use Scenario: Powering segmented backlight zones in a 10.25-inch automotive cluster display, where ALS1 monitors dashboard ambient and ALS2 tracks sunlight glare. IC Role / Device Role / Timing Role: Dual-ALS-enabled LED controller with programmable ramp rates - synchronizes brightness transitions across zones to meet automotive grade AEC-Q200 transient immunity requirements. Use Value: Enables seamless, flicker-free dimming during rapid ambient changes (e.g., tunnel entry/exit) using hardware-triggered INT interrupts and 8-ms minimum ramp step. |
| Industrial HMI Keypad | Medical Diagnostic Monitor |
Use Scenario: Illuminating membrane keypad LEDs in factory-floor HMIs exposed to variable fluorescent and daylight conditions. IC Role / Device Role / Timing Role: Programmable keypad backlight driver with dual PWM inputs - accepts MCU-generated PWM1 for manual override and ALS2 for automatic ambient compensation. Use Value: Maintains legible keypad contrast across −40°C to +85°C operating range using internal thermal shutdown and 2.7–5.5 V input tolerance. |
Use Scenario: Controlling calibrated backlight intensity in a DICOM-compliant radiology monitor requiring precise luminance stability and low-noise dimming. IC Role / Device Role / Timing Role: Low-noise, high-accuracy LED current source with 0.4% matching and 400-mV headroom regulation - ensures pixel-level grayscale fidelity under clinical viewing conditions. Use Value: Eliminates luminance drift during extended imaging sessions via stable current regulation and 1-A current limit protection against shorted LED faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DRVR | Single-string 40-V driver with analog/digital dimming; no ALS inputs or multi-string matching. | Lacks dual ALS, independent string control, and I²C programmability - suitable only for basic single-zone backlighting. | Select when cost sensitivity outweighs need for ambient adaptation or multi-string uniformity. |
| LM3630ATMFX/NOPB | 30-V, dual-string driver with I²C interface; no integrated ALS, lower OVP threshold, and no PWM inputs. | Requires external ALS circuitry and cannot support >30-V LED strings - limited to smaller displays or lower-VF LEDs. | Choose for compact dual-string designs where ambient sensing is handled externally and VOUT ≤30 V suffices. |
Compared with TPS61165DRVR and LM3630ATMFX/NOPB, LM3532TME-40A/NOPB uniquely combines triple 40-V current sinks, dual on-die ALS inputs, and per-string I²C programmability - making it the only option for high-reliability, ambient-adaptive multi-zone backlighting in space-constrained industrial and medical displays.
Availability
LM3532TME-40A/NOPB is available at Aetrix Electronics and suitable for mobile LCD backlighting, automotive infotainment displays, and industrial HMI keypad illumination requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM3532TME-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 and display interface solutions.
The LM3532TME-40A/NOPB belongs to TI's high-efficiency LED driver product line, designed specifically for ambient-adaptive backlighting in portable, automotive, and industrial displays requiring precision current matching and compact integration.
FAQ
What is the maximum output voltage supported by the LM3532TME-40A/NOPB?
The LM3532TME-40A/NOPB supports up to 40 V on its OVP pin, with overvoltage protection triggering at 40 V (±1 V hysteresis). This enables driving high-series-count white LED strings - for example, up to 12 LEDs at 3.2 V VF - without requiring external voltage clamping or secondary regulation stages. The boost converter maintains regulation up to this limit across the full −40°C to +85°C operating temperature range.
How does the LM3532TME-40A/NOPB achieve current matching between its three LED strings?
The LM3532TME-40A/NOPB achieves 0.4% typical current matching between ILED1, ILED2, and ILED3 through matched internal current-sink architecture and adaptive regulation to a common 0.4-V headroom reference. Matching is verified under 2.7–5.5 V input and full-scale current (20.2 mA) conditions, with worst-case deviation of ±2% between ILED2 and ILED3 when assigned to the same control bank - ensuring uniform luminance across multi-string LCD backlights.
Can the LM3532TME-40A/NOPB operate without an I²C host controller?
Yes, the LM3532TME-40A/NOPB supports standalone operation using its dual PWM inputs (PWM1/PWM2) and hardware enable (HWEN) pin. When configured in PWM-only mode via I²C registers during initialization, brightness is controlled directly by external PWM duty cycle, eliminating dependency on continuous I²C communication. HWEN remains required to power up the device, and ALS functionality remains active if sensors are connected.
What ambient light sensor configurations are supported by the LM3532TME-40A/NOPB?
The LM3532TME-40A/NOPB supports two independent ambient light sensor inputs (ALS1 and ALS2), each configurable with 32 internal resistor settings (e.g., 2.44 kΩ nominal) for gain adjustment. It includes an integrated 8-bit ADC with 154 µs conversion time, on-chip averaging, and zone-based algorithms - enabling robust ambient adaptation using either single-sensor or differential (e.g., front/rear) sensing topologies without external signal conditioning.
Does the LM3532TME-40A/NOPB include thermal protection?
Yes, the LM3532TME-40A/NOPB incorporates thermal shutdown protection that activates at 140°C (typical) junction temperature and releases at 125°C (typical) hysteresis. This internal circuitry prevents permanent damage during sustained overload or poor PCB thermal dissipation. The device also reports thermal status indirectly via reduced output current and increased quiescent current above 125°C, allowing firmware to implement predictive derating before shutdown occurs.
LM3532TME-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
LM3532TME-40A/NOPB FAQ
1.How can I place an order for LM3532TME-40A/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3532TME-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 LM3532TME-40A/NOPB reliable?
The price and inventory of LM3532TME-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 LM3532TME-40A/NOPB is usually 5 days.
3.What payment methods are accepted for LM3532TME-40A/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3532TME-40A/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3532TME-40A/NOPB?
LM3532TME-40A/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3532TME-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 LM3532TME-40A/NOPB?
For technical support, including LM3532TME-40A/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3532TME-40A/NOPB requirements.
6.How does Aetrix verify that LM3532TME-40A/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3532TME-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 LM3532TME-40A/NOPB meets industry standards.
7.What is the process for return or replacement of LM3532TME-40A/NOPB?
All LM3532TME-40A/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3532TME-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 LM3532TME-40A/NOPB part is unused and in its original packaging.
Return procedure for LM3532TME-40A/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3532TME-40A/NOPB Tags
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BCR402RE6327HTSA1
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR420UE6327HTSA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR421UW6-7
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