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Texas Instruments LM3432SQE/NOPB
- Part No.:
- LM3432SQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3432SQE/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 40MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,688
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Product details
Overview
LM3432SQE/NOPB from Texas Instruments is a 6-channel high-voltage LED current regulator for LCD backlighting, delivering precise 15–40 mA per string with ±2.0% matching at 40 mA, 80 V output voltage capability, and integrated Dynamic Headroom Control (DHC) interface to LM3430 boost controllers - used in automotive instrument clusters and industrial panel displays requiring stable multi-string LED drive.
For engineers reviewing the LM3432SQE/NOPB datasheet, LM3432SQE/NOPB pinout, LM3432SQE/NOPB application, or LM3432SQE/NOPB equivalent, key selection criteria include current matching tolerance, DHC compatibility with TI boost controllers, analog/PWM dimming mode flexibility, fault signaling (open/short/over-temperature), and WQFN-24 thermal performance (θJA = 33.2°C/W).
Technical Context
The LM3432SQE/NOPB integrates six independent current-sink channels with bandgap-referenced IREF control, enabling programmable 15–40 mA output via external resistor (RIREF). Its internal 5 V linear regulator (VCC) powers internal circuitry and supports ≤2 mA external load, with UVLO (4.15 V rising) and thermal monitoring (OTMb active at 125°C).
Digital PWM dimming uses MODE = GND and accepts 1.7 V HIGH / 1.0 V LOW signals on DIM; analog dimming configures MODE with capacitor (CMODE) to generate internal PWM from 1–3 V DC input. Short-fault detection triggers at 7.9 V (150 µs delay); open-fault detection is enabled only in LM3432 (not LM3432B), confirming LM3432SQE/NOPB includes open-fault reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 6 independent current sinks, each adjustable 15–40 mA via RIREF |
| Current Matching | ±2.0% max deviation between strings at 40 mA - ensures uniform brightness across LED arrays |
| Max Output Voltage | 80 V across IOUT pins - supports ≥12 white LEDs per string at typical forward voltage |
| Dimming Ratio | Up to 4000:1 at 500 Hz PWM - enables deep black-level control in display applications |
| Rise Time | 25 ns typical - minimizes transient current spikes during fast PWM switching |
| Thermal Shutdown | 165°C threshold with 20°C hysteresis - protects die during sustained overload or poor heatsinking |
| Fault Outputs | Open-drain FAULTb (LED open/short) and OTMb (over-temperature) - directly interface to MCU GPIO with pull-up |
Pinout & Package
LM3432SQE/NOPB is housed in a thermally enhanced 24-pin WQFN package (5 mm × 4 mm × 0.8 mm) with exposed thermal pad (EP) tied to PGND. Pin count and layout match TI's LM3432/LM3432B WQFN-24 specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Supply input | 6–40 V DC input rail; withstands 42 V transients - powers internal regulator and bias circuits |
| VCC | Internal LDO output | Stable 5 V ±5% regulated supply (min 680 nF CVCC required) - powers analog blocks and reference |
| IREF | Current setting reference | 1.245 V bandgap reference - sets string current via RIREF (e.g., 54.7 kΩ → 20 mA) |
| IOUT1–IOUT6 | Current sink outputs | High-side referenced sinks; each handles up to 80 V - connect to LED cathodes in common-anode topology |
| FAULTb / OTMb | Open-drain fault flags | Active-low signals pulled to GND on fault - require external pull-up for MCU interrupt or status polling |
| EN / MODE / DIM | Control interface | EN enables all channels; MODE selects analog (capacitor) or digital (GND) dimming; DIM accepts PWM or 1–3 V analog |
| VDHC / CDHC | DHC interface | VDHC outputs dynamic headroom voltage (0.625–1.25 V); CDHC sets DHC loop response time - enables efficiency optimization with LM3430 |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | VDHC output interfaces directly with LM3430 boost controller to minimize LED supply voltage - reduces power loss by up to 30% vs fixed-rail designs |
| Dual dimming mode support | Single-pin MODE selection between digital PWM (GND) and analog voltage (capacitor) - eliminates need for external dimming IC or MCU PWM peripherals |
| String current programmability | External RIREF resistor sets all six channels simultaneously - simplifies BOM and calibration vs per-string DACs or current mirrors |
| Integrated fault protection | Dedicated FAULTb (open/short) and OTMb (125°C warning) outputs - enable real-time system-level diagnostics without additional sense circuitry |
| Fast channel switching | 60 ns typical slew rate with 0.5 µs inter-channel phase delay - suppresses EMI and prevents simultaneous inrush current surges |
Applications
| Automotive Instrument Clusters | Industrial HMI Panels |
|---|---|
Use Scenario: Backlighting of TFT-LCD gauges and warning indicators in vehicles operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: 6-channel current sink regulating LED strings with ±2.0% matching - maintains consistent luminance despite temperature drift and supply variation. Use Value: Eliminates manual brightness calibration; DHC reduces thermal load on dashboard electronics by lowering VLED supply voltage dynamically. |
Use Scenario: High-reliability backlight for factory-floor HMIs exposed to vibration, dust, and wide input voltage fluctuations. IC Role / Device Role / Timing Role: Fault-aware LED driver with open/short detection and over-temperature warning - enables predictive maintenance and safe shutdown before failure. Use Value: FAULTb/OTMb signals feed directly into PLC I/O, reducing firmware complexity and improving system uptime. |
| Medical Diagnostic Displays | Avionics Cockpit Displays |
Use Scenario: DICOM-compliant grayscale backlighting for ultrasound and X-ray viewers requiring precise luminance uniformity and low flicker. IC Role / Device Role / Timing Role: Analog dimming mode with 1–3 V DC input provides smooth, noise-free intensity control - avoids PWM-induced image artifacts. Use Value: 4000:1 dimming ratio at 500 Hz enables accurate low-light calibration critical for diagnostic accuracy. |
Use Scenario: MIL-STD-810G-compliant cockpit displays needing EMI resilience, wide temp operation, and fail-safe fault reporting. IC Role / Device Role / Timing Role: WQFN-24 package with EP-to-PGND thermal path achieves θJA = 33.2°C/W - sustains full 40 mA/channel output under convection-only cooling. Use Value: Fast 25 ns rise time and staggered channel switching meet DO-160 Section 22 radiated emissions limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3432TME/NOPB | Same silicon, eHTSSOP-28 package (θJA = 29°C/W); includes all LM3432 features including open-fault detection | Better thermal performance in high-power layouts; larger footprint requires PCB redesign | Select when higher continuous current or improved thermal margin is needed and board space allows eHTSSOP-28 |
| TPS61165DRVR | Single-channel 40 V, 40 mA LED driver with integrated boost converter; no DHC or multi-string matching | Lacks string-to-string matching and DHC interface - unsuitable for multi-string backlight systems | Consider only for single-string, space-constrained applications where integrated boost eliminates external controller |
Compared with LM3432TME/NOPB, LM3432SQE/NOPB trades thermal margin for compactness in WQFN-24; compared with TPS61165DRVR, it delivers superior multi-string precision and system-level efficiency via DHC - making it the only choice for 6-string LCD backlighting with tight luminance uniformity requirements.
Availability
LM3432SQE/NOPB is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI panels, and medical diagnostic displays requiring stable component supply, long-term lifecycle support, and TI-qualified production traceability.
Supply support for LM3432SQE/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 automotive-grade reliability validation and broad analog IP portfolio.
The LM3432 product line targets high-precision LED backlighting for displays demanding uniform brightness, fault resilience, and adaptive efficiency - designed specifically for integration with TI's LM3430 boost controllers in automotive and industrial applications.
FAQ
Does LM3432SQE/NOPB support open-circuit fault detection?
Yes, LM3432SQE/NOPB supports LED open-fault detection and reporting via the FAULTb pin, with 50 µs detection delay. This feature is present in the LM3432 variant (which LM3432SQE/NOPB belongs to) but omitted in the LM3432B. Open-fault latching remains active until EN is toggled or power is cycled, ensuring reliable system-level fault capture in safety-critical displays.
What is the maximum allowable voltage on the IOUT pins of LM3432SQE/NOPB?
The absolute maximum voltage rating for IOUT1–IOUT6 pins of LM3432SQE/NOPB is 82 V, with recommended operating limit of 80 V. This enables driving strings of up to 12–14 white LEDs (3.0–3.4 V VF each) while maintaining sufficient headroom for regulation. Exceeding 80 V risks premature current-source saturation and reduced dimming linearity.
How does Dynamic Headroom Control (DHC) improve system efficiency with LM3432SQE/NOPB?
LM3432SQE/NOPB's DHC function outputs a voltage (VDHC) proportional to the minimum IOUT pin voltage, which - when fed into TI's LM3430 boost controller - dynamically lowers the LED supply rail (VLED+) to the lowest level needed for regulation. This reduces power dissipation in the current sinks by up to 30%, especially beneficial in thermally constrained automotive and portable displays.
Can LM3432SQE/NOPB operate with both analog and digital dimming on the same design?
No - LM3432SQE/NOPB requires hardware configuration via the MODE pin: shorted to GND for digital PWM dimming, or connected to a capacitor for analog dimming. The two modes are mutually exclusive per power-up cycle. However, the same PCB layout can support either mode via zero-ohm jumper or capacitor placement, enabling flexible qualification across customer variants.
What thermal performance can be expected from LM3432SQE/NOPB in its WQFN-24 package?
LM3432SQE/NOPB in WQFN-24 exhibits a junction-to-ambient thermal resistance (θJA) of 33.2°C/W under standard JEDEC 2-layer board conditions. With EP soldered to a 1-in² copper pour, it sustains full 40 mA per channel continuously at +85°C ambient. Derating is required above 100°C ambient or with limited copper area to avoid exceeding 125°C max operating junction temperature.
LM3432SQE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- 80V
- Current - Output / Channel:
- 40mA
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x5)
LM3432SQE/NOPB FAQ
1.How can I place an order for LM3432SQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3432SQE/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 LM3432SQE/NOPB reliable?
The price and inventory of LM3432SQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3432SQE/NOPB is usually 5 days.
3.What payment methods are accepted for LM3432SQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3432SQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3432SQE/NOPB?
LM3432SQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3432SQE/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 LM3432SQE/NOPB?
For technical support, including LM3432SQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3432SQE/NOPB requirements.
6.How does Aetrix verify that LM3432SQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3432SQE/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 LM3432SQE/NOPB meets industry standards.
7.What is the process for return or replacement of LM3432SQE/NOPB?
All LM3432SQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3432SQE/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 LM3432SQE/NOPB part is unused and in its original packaging.
Return procedure for LM3432SQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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