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Texas Instruments LM3432BSQX/NOPB
- Part No.:
- LM3432BSQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3432BSQX/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 40MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,316
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Product details
Overview
LM3432BSQX/NOPB from Texas Instruments is a 6-channel high-voltage LED current regulator IC for LCD backlighting, delivering ±2.0% current matching at 40 mA across six independent 15–40 mA current sinks, with 80 V maximum IOUT voltage rating and integrated Dynamic Headroom Control (DHC) interface to LM3430 boost controllers in automotive and industrial display systems.
For engineers reviewing the LM3432BSQX/NOPB datasheet, LM3432BSQX/NOPB pinout, LM3432BSQX/NOPB application, or LM3432BSQX/NOPB equivalent, this device supports both analog voltage and digital PWM dimming modes, provides open-drain FAULTb/OTMb fault signaling, operates from 6–40 V VIN, and is qualified for −40°C to +125°C junction temperature in thermally enhanced WQFN-24 (5×4×0.8 mm) packaging.
Technical Context
The LM3432BSQX/NOPB integrates six matched current-sink channels with bandgap-referenced IREF control (1.245 V typical), internal 5 V linear regulator (VCC, 5 V ±5%, 9 mA short-circuit limit), and DHC output (VDHC) that regulates LED string headroom to 0.625 V at 20 mA via external gain resistor to LM3430. It uses dual dimming architecture: MODE pin grounded enables direct PWM input on DIM; MODE pin capacitor-coupled enables analog-to-PWM conversion with programmable frequency (e.g., 500 Hz → 4000:1 dimming ratio).
Fault protection includes LED short detection (7.9 V threshold, 150 µs delay), overtemperature warning (OTMb active low at 125°C), thermal shutdown (165°C), and - unlike LM3432 - excludes open-fault detection. Channel disable is supported by grounding IOUT5/IOUT6 before power-up, enabling 4-/5-/6-string configuration without fault activation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VIN Range | 6 V to 40 V - powers internal circuitry and supports wide-input LED supply rails without external LDO. |
| IOUT per Channel | 15 mA to 40 mA - set by external RIREF (e.g., 54.7 kΩ → 20 mA); max 40 mA ensures compatibility with mid-power white LEDs. |
| Current Matching | ±2.0% at 40 mA - guarantees uniform brightness across 6 LED strings in high-end displays. |
| IOUT Voltage Rating | Up to 80 V - supports ≥12 white LEDs/string (VF ≈ 3.3 V) with margin for ripple and transients. |
| Rise Time (tr) | 25 ns typical - enables precise PWM dimming with minimal duty-cycle distortion at high frequencies. |
| DHC Output (VDHC) | 0.625 V regulation at 20 mA - minimizes LED supply rail voltage via LM3430 feedback, directly improving system efficiency. |
| Operating Temp | −40°C to +125°C - validated for automotive cabin displays and industrial HMIs with extended thermal range. |
Pinout & Package
LM3432BSQX/NOPB is housed in a thermally enhanced 24-pin WQFN package (5 mm × 4 mm × 0.8 mm) with exposed thermal pad (EP) connected to PGND. Pin count and layout match TI's standard WQFN-24 footprint for drop-in PCB compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Supply Input | Primary power input (6–40 V); feeds internal VCC regulator and channel drivers. |
| VCC | Internal Regulator Output | Stable 5 V output (min 4.7 V, max 5.25 V) for internal logic; requires ≥680 nF CVCC for stability. |
| IREF | Current Reference Input | 1.245 V reference node; RIREF sets all six IOUT currents (IOUT = 1.094×10⁶ / RIREF in mA). |
| IOUT1–IOUT6 | Current Sink Outputs | High-side referenced, 80 V tolerant outputs; each sinks up to 40 mA with ±2% matching. |
| EN | Enable Control | Active-HIGH enable (1.75 V threshold); toggling resets latched faults and reinitializes disabled channels. |
| MODE | Dimming Mode Select | Ground = digital PWM mode; capacitor-to-GND = analog dimming with internal ramp generator. |
| DIM | Dimming Signal Input | Accepts 0–5 V analog voltage or 1.7 V min PWM signal; controls all six channels synchronously. |
| FAULTb / OTMb | Open-Drain Fault Flags | Active-low signals to MCU: FAULTb indicates LED short; OTMb warns at 125°C (non-latching). |
| VDHC / CDHC | DHC Interface | VDHC outputs regulated headroom voltage; CDHC sets DHC loop response time via external capacitor. |
| AGND / PGND | Analog & Power Ground | Separate ground pins reduce noise coupling between precision reference and high-current sinks. |
Key Features
| Feature | Design Value |
|---|---|
| 6-Channel Current Regulation | Independent, matched current sinks (15–40 mA) eliminate need for per-string ballast resistors and simplify BOM. |
| Dynamic Headroom Control (DHC) | VDHC output interfaces directly with LM3430 boost controller to minimize LED supply voltage, reducing power loss in driver stage. |
| Dual Dimming Architecture | Hardware-selectable mode (digital PWM or analog voltage) enables flexible integration with MCU GPIO or DAC outputs. |
| LED Short & Thermal Fault Detection | Integrated 7.9 V short-detect threshold and 125°C OTMb warning provide real-time system-level safety without external comparators. |
| Configurable Channel Count | IOUT5/IOUT6 can be disabled at power-up by grounding, allowing 4- or 5-string operation while preserving full fault coverage on active channels. |
Applications
| Automotive Instrument Cluster Backlight | Industrial HMI Display Panel |
|---|---|
Use Scenario: Driving 6 parallel LED strings (12 white LEDs each) behind TFT-LCD in vehicle dashboards with ambient temperature ranging −40°C to +85°C. IC Role / Device Role / Timing Role: Current sink regulator providing stable 20 mA per string with ±2.0% matching to prevent luminance non-uniformity under vibration and thermal cycling. Use Value: DHC interface reduces VLED+ supply voltage from 52 V to 48.5 V at 20 mA, cutting boost converter losses by ~7% and easing thermal design. |
Use Scenario: High-brightness 10.1″ industrial display used in factory automation panels with 24/7 operation and stringent EMI requirements. IC Role / Device Role / Timing Role: LED driver IC implementing analog dimming via 0–3.3 V DAC output to maintain flicker-free brightness control during motion-sensitive tasks. Use Value: 25 ns rise time and 60 ns slew rate ensure clean PWM edges at 1 kHz dimming frequency, eliminating visible artifacts in fast-moving UI elements. |
| Medical Diagnostic Monitor Backlight | Avionics Cockpit Display |
Use Scenario: Dual-source redundant backlight for Class II medical imaging monitors requiring >10,000-hour MTBF and zero luminance drift. IC Role / Device Role / Timing Role: Precision current regulator with 1.245 V bandgap reference and ±2.0% matching to guarantee consistent color point across viewing angles and lifetime. Use Value: Internal 5 V VCC regulator powers external ADCs and sensors, reducing need for secondary LDOs and improving board-level reliability. |
Use Scenario: MIL-STD-810G-compliant cockpit display operating in −55°C to +70°C ambient with rapid thermal transients. IC Role / Device Role / Timing Role: High-voltage LED driver supporting 80 V IOUT rating to accommodate long LED strings and transient surges during avionics power sequencing. Use Value: Overtemperature warning (OTMb) at 125°C triggers MCU-based derating before thermal shutdown (165°C), preserving display uptime during high-load scenarios. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3432SQX/NOPB | Includes LED open-fault detection; same pinout, same WQFN-24 package; otherwise identical electrical specs. | Required where open-circuit monitoring of individual LED strings is mandatory (e.g., safety-critical signage). | Select LM3432SQX/NOPB only if open-fault reporting is needed; LM3432BSQX/NOPB offers cost and layout simplification where short-fault and thermal protection suffice. |
| TPS61165DRVR | Single-channel 40 V, 30 mA LED driver with integrated boost; no multi-channel current matching or DHC interface. | Suitable for low-channel-count designs (<3 strings); lacks string-to-string matching and system-level efficiency optimization. | Choose TPS61165DRVR for space-constrained single-string applications; LM3432BSQX/NOPB is superior for 4–6 string systems demanding uniformity and efficiency. |
Compared with LM3432SQX/NOPB, LM3432BSQX/NOPB removes open-fault detection to reduce complexity and cost while retaining identical current regulation, DHC, and thermal protection-making it optimal for cost-sensitive, high-volume backlighting where short-fault coverage is sufficient. Versus TPS61165DRVR, it delivers true 6-channel matching and system-level efficiency gains via DHC, but requires an external boost controller.
Availability
LM3432BSQX/NOPB is available at Aetrix Electronics and suitable for automotive instrument clusters, industrial HMI panels, medical diagnostic monitors, and avionics cockpit displays requiring stable component supply, long-term lifecycle support, and AEC-Q200-aligned thermal performance.
Supply support for LM3432BSQX/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 ICs, with decades of leadership in LED driver innovation and automotive-grade reliability validation.
The LM3432B product line targets high-efficiency, multi-string LED backlighting for displays in harsh environments, emphasizing precision current matching, thermal resilience, and system-level power optimization through features like Dynamic Headroom Control.
FAQ
What is the maximum LED string voltage supported by LM3432BSQX/NOPB?
The LM3432BSQX/NOPB supports up to 80 V across each IOUT pin relative to PGND. This allows driving strings of up to approximately 12 white LEDs (VF ≈ 3.3 V each) plus margin for ripple and transient spikes. The absolute maximum IOUT voltage rating is 82 V, but continuous operation is specified up to 80 V per the Recommended Operating Conditions table in the SNVS498D datasheet.
Does LM3432BSQX/NOPB support analog dimming, and how is it configured?
Yes, LM3432BSQX/NOPB supports analog dimming by connecting a capacitor (CMODE) between the MODE pin and AGND, then applying a 0–3 V DC voltage to the DIM pin. The internal ramp generator converts this voltage into a PWM signal with frequency determined by CMODE value (e.g., 5.6 nF → ~300 kHz). At VDIM = 1 V, duty cycle is 0%; at VDIM = 3 V, duty cycle is 100%.
How does the Dynamic Headroom Control (DHC) function work in LM3432BSQX/NOPB?
In LM3432BSQX/NOPB, DHC works by regulating the VDHC pin output to 0.625 V (at 20 mA) or 1.25 V (at 40 mA), which is fed via a gain-setting resistor to the VDHC pin of an LM3430 boost controller. This causes the LM3430 to lower its VLED+ output to the minimum required to keep all six current sinks in regulation-reducing power loss and heat generation in the LED supply stage.
What fault protections are implemented in LM3432BSQX/NOPB?
LM3432BSQX/NOPB implements LED short-circuit detection (7.9 V threshold, 150 µs delay), overtemperature warning (OTMb active low at 125°C), and thermal shutdown (165°C with 20°C hysteresis). Unlike the LM3432 variant, it does not include open-fault detection - FAULTb asserts only for short conditions or thermal events, not open strings.
Can LM3432BSQX/NOPB drive more than 40 mA per string?
No - LM3432BSQX/NOPB is rated for maximum 40 mA per channel. However, multiple IOUT pins (e.g., IOUT1 + IOUT2) can be paralleled externally to achieve higher per-string current (e.g., 80 mA), though this reduces total channel count and slightly degrades current matching due to routing imbalances. The datasheet explicitly states IOUT_max = 110 mA only when IREF is shorted to GND - an invalid operating condition for regulated current mode.
LM3432BSQX/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)
LM3432BSQX/NOPB FAQ
1.How can I place an order for LM3432BSQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3432BSQX/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 LM3432BSQX/NOPB reliable?
The price and inventory of LM3432BSQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3432BSQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM3432BSQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3432BSQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3432BSQX/NOPB?
LM3432BSQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3432BSQX/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 LM3432BSQX/NOPB?
For technical support, including LM3432BSQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3432BSQX/NOPB requirements.
6.How does Aetrix verify that LM3432BSQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3432BSQX/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 LM3432BSQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM3432BSQX/NOPB?
All LM3432BSQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3432BSQX/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 LM3432BSQX/NOPB part is unused and in its original packaging.
Return procedure for LM3432BSQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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