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Texas Instruments LM3432BSQE/NOPB
- Part No.:
- LM3432BSQE/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM3432BSQE/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 40MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,934
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Product details
Overview
LM3432BSQE/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 all strings, supporting up to 80 V IOUT voltage, and enabling dynamic headroom control (DHC) with external LM3430 boost controllers in automotive and industrial display systems.
For engineers reviewing the LM3432BSQE/NOPB datasheet, LM3432BSQE/NOPB pinout, LM3432BSQE/NOPB application, or LM3432BSQE/NOPB equivalent, this device supports digital PWM and analog dimming inputs, provides open/short fault signaling (open fault excluded in LM3432B), integrates a 5 V internal LDO, and operates from –40°C to +125°C junction temperature.
Technical Context
The LM3432BSQE/NOPB implements six independent current-sink channels with bandgap-referenced regulation, where IOUT is set by an external resistor (RIREF) and matched within ±2.0% at 40 mA. Its internal 5 V linear regulator (VCC) supplies internal circuitry and supports ≤2 mA external load, with UVLO thresholds at 3.9 V (falling) and 4.15 V (rising).
Digital dimming uses MODE = GND and PWM input on DIM with 0.5 µs channel phase delay; analog dimming uses MODE capacitor (CMODE) to generate internal PWM, achieving up to 4000:1 dimming ratio at 500 Hz. DHC functionality regulates VDHC output to 0.625 V (at 20 mA) to minimize LED supply rail voltage and maximize system efficiency when paired with LM3430.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 6 independent current sinks, each adjustable 15–40 mA via RIREF |
| Max IOUT Voltage | 80 V - enables driving long LED strings (e.g., 12 white LEDs @ 3.8 V each) |
| Current Matching | ±2.0% at 40 mA - ensures uniform brightness across backlight zones |
| Dimming Support | Dual-mode: digital PWM (MODE = GND) or analog voltage (MODE + CMODE) |
| Thermal Protection | Over-temperature warning (OTMb active LOW at 125°C) and shutdown at 165°C |
| Package | WQFN-24 (5 mm × 4 mm × 0.8 mm), thermally enhanced with exposed pad |
| Supply Range | VIN = 6–40 V - compatible with 12 V/24 V industrial and automotive rails |
Pinout & Package
LM3432BSQE/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 for optimal heat dissipation in high-current backlight applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Accepts 6–40 V DC supply; transient-rated to 42 V |
| VCC | Internal LDO output | Stable 5 V ±5% regulated output; requires ≥680 nF CVCC for stability |
| IREF | Current reference input | 1.245 V bandgap reference; sets IOUT via RIREF (e.g., 54.7 kΩ → 20 mA) |
| IOUT1–IOUT6 | Current sink outputs | Each drives one LED string; withstands up to 80 V; channels 5/6 disableable via GND tie at power-up |
| EN | Enable control | Active-HIGH logic; threshold 1.48–2.0 V; pulls all outputs OFF when low |
| MODE | Dimming mode select | GND = digital PWM; capacitor-to-GND = analog dimming (CMODE sets fPWM) |
| DIM | Dimming signal input | Accepts 0–5 V analog or 1.7 V HIGH / 1 V LOW PWM; controls all 6 channels synchronously |
| FAULTb | Open-drain fault flag | Active-LOW indication of short-circuit or (LM3432 only) open-circuit fault; latched until EN toggle or power cycle |
| OTMb | Open-drain over-temp flag | Active-LOW at 125°C; device continues operating until 165°C shutdown |
| VDHC / CDHC | DHC interface | VDHC outputs regulated voltage (0.625 V @ 20 mA); CDHC sets DHC loop response time via external capacitor |
| AGND / PGND | Analog & power ground | Separate grounds reduce noise coupling; EP must connect to PGND for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Headroom Control (DHC) | Reduces LED supply voltage to minimum required headroom (e.g., 0.625 V at 20 mA), cutting boost converter losses and improving total system efficiency |
| Fast current switching | 60 ns typical rise time (tr) ensures precise PWM dimming fidelity and minimizes current overshoot during transitions |
| Wide dimming ratio | Up to 4000:1 at 500 Hz - enables deep black levels in high-contrast LCD panels without visible flicker |
| String current programmability | External RIREF resistor allows precise, temperature-stable current setting (15–40 mA) with ±1% tolerance recommendation |
| Fault diagnostics | Dedicated FAULTb and OTMb pins provide real-time, latched fault status to MCU without requiring polling or ADC reads |
Applications
| LCD Display Backlighting | Industrial HMI Panels |
|---|---|
|
Use Scenario: Driving six parallel LED strings (12 white LEDs per string) in a 10.4-inch industrial LCD module powered from 24 V rail. IC Role / Device Role / Timing Role: Current-regulating sink for each string; synchronizes dimming across all channels with 0.5 µs inter-channel phase delay to limit inrush current. Use Value: Delivers uniform luminance (±2.0% current match) and supports 4000:1 analog dimming for daylight-readable contrast control. |
Use Scenario: Backlighting for ruggedized medical display with extended temperature operation (–40°C to +85°C ambient). IC Role / Device Role / Timing Role: High-voltage current sink enabling 80 V string compliance; integrated OTMb flag triggers thermal derating before shutdown. Use Value: Eliminates need for external thermal sensor and discrete current-setting resistors, reducing BOM count and layout area. |
| Automotive Infotainment Displays | General Lighting Modules |
|
Use Scenario: LED backlight for 7-inch automotive center-stack display, powered from 12 V battery with load-dump transients. IC Role / Device Role / Timing Role: Regulates current under wide VIN range (6–40 V); DHC interface with LM3430 optimizes boost efficiency during variable dimming. Use Value: Maintains consistent brightness despite battery voltage sag and reduces EMI by minimizing unnecessary headroom voltage. |
Use Scenario: Constant-current driver for signage lighting using 6 × 20 mA strings with mixed-color LEDs (white + amber). IC Role / Device Role / Timing Role: Provides independent current regulation per string; MODE/DIM pins enable centralized analog dimming control from microcontroller DAC. Use Value: Enables color-point stability across strings via matched current sources, avoiding binning-dependent brightness drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3432SQE/NOPB | Same WQFN-24 package and pinout; includes LED open-fault detection (LM3432B does not) | Required where open-circuit monitoring is mandatory (e.g., safety-critical displays) | Select LM3432SQE/NOPB if open-fault reporting is needed; otherwise LM3432BSQE/NOPB offers identical current regulation and DHC capability |
| TPS61165DRVR | Single-channel, 40 V max IOUT, integrated boost controller; no DHC or multi-string matching | Suitable for compact single-string designs but lacks string-to-string matching or DHC coordination | Choose TPS61165DRVR only for cost-sensitive, low-channel-count applications without matching or system-level efficiency optimization needs |
Compared with LM3432SQE/NOPB, LM3432BSQE/NOPB removes open-fault detection but retains identical current accuracy, DHC, and thermal protection-making it ideal for cost-optimized backlighting where open faults are mitigated by system design. TPS61165DRVR trades multi-string precision for integration, limiting use to simpler single-string topologies.
Availability
LM3432BSQE/NOPB is available at Aetrix Electronics and suitable for LCD display backlighting, industrial HMI panels, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3432BSQE/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 and automotive-grade reliability.
The LM3432BSQE/NOPB belongs to TI's high-voltage LED backlight driver product line, designed specifically for energy-efficient, multi-string LCD backlighting in demanding industrial and automotive environments.
FAQ
What is the maximum LED string voltage supported by the LM3432BSQE/NOPB?
The LM3432BSQE/NOPB supports up to 80 V across each IOUT pin relative to PGND, enabling configurations with up to ~12 white LEDs (3.8 V forward voltage each) per string. This rating is absolute maximum; recommended operating voltage is 0–80 V, with 82 V being the absolute limit per datasheet.
Does the LM3432BSQE/NOPB support both analog and digital dimming?
Yes, the LM3432BSQE/NOPB supports dual dimming modes: digital PWM dimming when MODE is tied to GND and a PWM signal is applied to DIM; and analog dimming when MODE is connected to ground via a capacitor (CMODE), allowing a DC voltage (1–3 V) on DIM to control duty cycle internally.
How does the Dynamic Headroom Control (DHC) function improve system efficiency?
The LM3432BSQE/NOPB's DHC output (VDHC) interfaces with TI's LM3430 boost controller to dynamically lower the LED supply voltage to the minimum required headroom - e.g., 0.625 V at 20 mA - reducing power loss in the boost stage and increasing overall system efficiency by up to 15% in typical backlight configurations.
What fault protections are implemented in the LM3432BSQE/NOPB?
The LM3432BSQE/NOPB provides LED short-circuit detection (latched FAULTb activation after >150 µs at >7.9 V), over-temperature warning (OTMb active LOW at 125°C), and thermal shutdown (165°C). Unlike the LM3432, the LM3432B variant omits open-circuit fault detection.
Can multiple LM3432BSQE/NOPB outputs be paralleled to increase per-string current?
Yes - the LM3432BSQE/NOPB allows paralleling of IOUT pins (e.g., IOUT1 + IOUT2) to achieve higher per-string current beyond 40 mA, though this reduces total channel count. Current matching remains within ±2.0%, and thermal design must account for increased power dissipation in shared traces and pads.
LM3432BSQE/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)
LM3432BSQE/NOPB FAQ
1.How can I place an order for LM3432BSQE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3432BSQE/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 LM3432BSQE/NOPB reliable?
The price and inventory of LM3432BSQE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3432BSQE/NOPB is usually 5 days.
3.What payment methods are accepted for LM3432BSQE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3432BSQE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3432BSQE/NOPB?
LM3432BSQE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3432BSQE/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 LM3432BSQE/NOPB?
For technical support, including LM3432BSQE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3432BSQE/NOPB requirements.
6.How does Aetrix verify that LM3432BSQE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM3432BSQE/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 LM3432BSQE/NOPB meets industry standards.
7.What is the process for return or replacement of LM3432BSQE/NOPB?
All LM3432BSQE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM3432BSQE/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 LM3432BSQE/NOPB part is unused and in its original packaging.
Return procedure for LM3432BSQE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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