LM3492HCQMHX/NOPB - 2-Ch Boost LED Driver, 65V/200mA | TI
MPN: LM3492HCQMHX/NOPB ✓ نشطLM3492HCQMHX/NOPB نظرة عامة
A boost LED driver is a switching power-supply topology that steps the input voltage up to a higher output voltage while regulating the current through a string of series-connected LEDs. Boost drivers sit inside the larger power-management hierarchy of switching converters -> DC-DC converters -> PMICs, and the two-channel integrated approach removes the need for a second controller IC in dual-string backlight or accent-lighting designs.
Key features of the LM3492HCQMHX/NOPB include independent analog/PWM dimming on each channel, a wide 200 kHz to 1 MHz programmable switching frequency for EMI/size optimization, integrated power MOSFET support through an external N-FET, and a thermally enhanced PowerPAD exposed-pad package. Per datasheet specs, the device drives two strings of LEDs with up to 65 V total compliance and accepts supply rails suitable for automotive and industrial backlighting.
Architecturally, the device combines a peak-current-mode boost controller with two linear current sinks on the low side of each LED string. The boost stage holds the output above the highest LED-string forward voltage while the current sinks modulate brightness via PWM or analog dimming. This topology achieves high efficiency and fast transient response when LEDs are modulated, which avoids the audible flicker and large bulk capacitors required by lower-bandwidth approaches.
Typical applications include automotive LCD backlighting, infotainment and cluster-panel lighting, industrial signage and architectural accent lighting, and emergency/architectural fixtures requiring two independently dimmable strings. The 65 V compliance also supports long LED chains in display backlights and architectural luminaires.
When designing with this part, choose the external boost inductor, switching FET, and sense resistor for the target Vin/Vout/IOUT combination, and provide sufficient copper area under the PowerPAD for thermal dissipation. The two dimming inputs are independent, so PWM frequencies and duty cycles can differ between channels without crosstalk.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
بدائل مباشرة لـ LM3492HCQMHX/NOPB — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع LM3492HCQMHX/NOPB (نفس عامل الشكل والبصمة) — يختلف في Automotive Grade, Package, Switching Frequency, Topology.
LM3492HCQMH/NOPB
✅ بديل مباشر✓ متوفر في المخزون
$2.7891 / وحدة
عرض ورقة البيانات ←LM3492HCQMHXSLASHNOPB.B
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM3492HCQMH/NOPB
✅ بديل مباشر✓ متوفر في المخزون
$2.7891 / وحدة
عرض ورقة البيانات ←LM3423Q0MHX/NOPB
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM3492HC/-Q1
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
LM3492HCQMHX/NOPB الحدود القصوى والخصائص الكهربائية
| البنية الطوبولوجية | Step-Up (Boost) DC-DC Converter with Current Regulator |
| عدد المخارج | 2 (independent dimmable channels) |
| جهد الخرج - الأقصى | 65 V |
| Per-Channel LED Current | 50 mA to 250 mA |
| Maximum LED Power | 15 W per channel |
| تردد التبديل | 200 kHz to 1 MHz (programmable) |
| Dimming Method | Independent Analog/PWM per channel |
| تيار التغذية | 5200 uA (typical, per datasheets.com listing) |
| العلبة | 20-Pin HTSSOP-EP (PWP), 4.40 mm width |
| نوع التركيب | Surface Mount |
| درجة حرارة التشغيل | -40C to +125C |
| عدد الأطراف | 20 |
| Packaging | Tape & Reel |
| Automotive Grade | AEC-Q100 qualified (LM3492-Q1 family) |
| حالة RoHS | Compliant |
تكوين أطراف LM3492HCQMHX/NOPB
| دبوس 1 | VIN — Input supply voltage |
| دبوس 2 | BST — Bootstrap capacitor for high-side gate drive |
| دبوس 3 | HG — High-side gate drive output |
| دبوس 4 | SW — Switching node (external L/FET connection) |
| دبوس 5 | PGND — Power ground |
| دبوس 6 | LG — Low-side gate drive output |
| دبوس 7 | VCC — Internal regulator output / decoupling |
| دبوس 8 | RT — Switching frequency programming resistor |
| دبوس 9 | COMP — Compensation network node |
| دبوس 10 | FB — Boost output voltage feedback |
| دبوس 11 | DIM1 — Channel 1 dimming input (analog/PWM) |
| دبوس 12 | DIM2 — Channel 2 dimming input (analog/PWM) |
| دبوس 13 | ISET1 — Channel 1 LED current setpoint |
| دبوس 14 | ISET2 — Channel 2 LED current setpoint |
| دبوس 15 | SNS1 — Channel 1 LED current sense input |
| دبوس 16 | SNS2 — Channel 2 LED current sense input |
| دبوس 17 | EN — Enable input (active high) |
| دبوس 18 | AGND — Analog ground |
| دبوس 19 | NC — Not connected (per datasheet) |
| دبوس 20 | NC — Not connected (per datasheet) |
التطبيقات النموذجية
LM3492HCQMHX/NOPB مناسب لـ 6 التطبيقs: Automotive LCD Backlighting, Architectural Accent Lighting, Industrial Signage and Channel Letters, Emergency and Egress Lighting, Infotainment and Cluster Panel Backlights, RGB and Tunable-White Lighting Strips.
Automotive LCD Backlighting
The LM3492HCQMHX/NOPB drives two LED strings up to 65 V output and 250 mA per channel, ideal for automotive dashboard and infotainment displays. The integrated boost converter eliminates an external controller IC, while the two independent dimming inputs let the system PWM-modulate one zone and analog-dim the other for adaptive brightness. The AEC-Q100 qualified LM3492-Q1 variant supports -40C to +125C operation, meeting automotive cluster-panel requirements. A 10-15 W per-channel capability covers 7-12 inch display backlights in mainstream vehicles.
موصى به
Architectural Accent Lighting
Two independently dimmable LED strings up to 250 mA each make the LM3492HCQMHX/NOPB a strong fit for two-channel architectural fixtures such as cove lights and dual-beam spotlights. The 200 kHz to 1 MHz switching range lets the designer shrink the boost inductor for compact ceiling fixtures, while the 65 V output supports long LED chains in recessed wall-wash designs. Independent analog and PWM dimming on each channel enables tunable-white or RGB mixing with a single IC, reducing BOM cost versus two discrete drivers.
موصى به
Industrial Signage and Channel Letters
The 65 V compliance of the LM3492HCQMHX/NOPB supports long series-connected LED chains used in large-format signage and illuminated channel letters. Two-channel individual dimming allows day/night or foreground/background brightness control from a single driver, simplifying wiring harnesses. The 200 kHz to 1 MHz programmable switching frequency helps place EMI outside sensitive AM bands, and the thermally enhanced HTSSOP-EP package handles continuous full-power operation in enclosed sign cabinets. Per-channel 250 mA output covers most single-color and tunable-white channel-letter designs.
موصى به
Emergency and Egress Lighting
The LM3492HCQMHX/NOPB is well suited to emergency lighting fixtures that require two independently controlled LED arrays - a primary illumination string and a secondary status-indicator string. The wide input range and integrated boost converter operate directly from battery-backed 12 V or 24 V rails while the 65 V compliance supports long LED chains for area lighting. Independent PWM dimming on each channel lets the primary string modulate while the status string stays at full brightness. AEC-Q100 qualification of the LM3492-Q1 family ensures reliability in critical-safety applications.
موصى به
Infotainment and Cluster Panel Backlights
The two-channel boost architecture of the LM3492HCQMHX/NOPB enables dual-zone dimming for instrument clusters and infotainment screens, where one channel backlights the main display and the other drives indicator LEDs. Up to 250 mA per channel supports 4-7 inch TFT panels and OLED sub-displays. The 200 kHz to 1 MHz switching frequency range and externally programmable dimming give automotive designers flexibility to optimize for EMI compliance in the AM/FM radio band. The AEC-Q100 LM3492-Q1 family variant is preferred for OEM automotive designs.
موصى به
RGB and Tunable-White Lighting Strips
The LM3492HCQMHX/NOPB drives two LED strings with independent analog/PWM dimming, which fits tunable-white (warm-white + cool-white) and dual-color RGB strip designs where one IC replaces two separate drivers. The 65 V output supports long series LED chains typical of architectural strips, and the 250 mA per-channel ceiling covers most residential and commercial strip-current requirements. The HTSSOP-EP exposed-pad package allows the IC to dissipate the boost-converter heat efficiently when embedded in slim aluminum extrusions.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ LM3492HCQMHX/NOPB — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | LM3492HCQMH/NOPB | LM3492HCQMHXSLASHNOPB.B | LM3492HC/-Q1 | LM3423Q0MHX/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 20-HTSSOP-EP (PWP) | 20-HTSSOP-EP (PWP) - same | 20-HTSSOP-EP (PWP) - same | 20-HTSSOP-EP (PWP) - same | 20-HTSSOP-EP (PWP) - same |
| Number of Channels | 2 (independent) | 2 (independent) | 2 (independent) | 2 (independent) | 1 channel |
| AEC-Q100 Qualified | Family qualified (LM3492-Q1) | Family qualified | Family qualified | Yes (Q1 suffix) | Yes (Q1 suffix) |
| Packaging Format | Tape & Reel | Tube | Tape & Reel (datasheet rev B) | Tape & Reel / Tube | Tape & Reel |
أبرز الفروقات
- Two-channel independent dimming in a single 20-pin IC (مقابلLM3423Q0MHX/NOPB)
- Integrated 65 V boost converter eliminates external controller (مقابلDiscrete boost + LM3405 LED driver)
- Wide 200 kHz to 1 MHz programmable switching range (مقابلLM3405XMKX/NOPB)
ملاحظات التصميم
The 20-pin HTSSOP-EP (PWP) package uses an exposed thermal pad (pin 21) that must be soldered to a PCB copper pour - typically 1-2 square inches on a 4-layer board - to achieve the datasheet-rated thermal resistance. Estimated: at VIN=12V, VOUT=48V, 200 mA per channel, the device dissipates approximately 7.2 W in the boost FET plus 3.6 W in the LED strings for a total of ~11 W. Without adequate copper, the device will enter thermal foldback and reduce LED current at high ambient temperatures.
Place the boost inductor, switching FET, and input/output capacitors on the same board side as the LM3492HCQMHX/NOPB and minimize the loop area of the SW node. Use a ground plane under the IC and tie the PowerPAD to it with multiple thermal vias. According to TI datasheet application circuit, the boost output capacitor (typically 1-4.7 uF X7R ceramic) must be placed within 5 mm of the BST and SW pins to minimize switching ringing.
Route the DIM1 and DIM2 traces away from the SW node to avoid capacitive coupling that can introduce dimming artifacts. According to TI LM3492 datasheet, the RT resistor should be placed close to the RT pin with the AGND return path kept short. Keep the SNS1/SNS2 current-sense traces as short as possible and use a Kelvin connection to the sense resistor to preserve current-regulation accuracy under PWM dimming.
Common pitfalls when designing with the LM3492HCQMHX/NOPB include: omitting the bootstrap capacitor (required for the high-side gate drive), using an undersized output capacitor (causes LED current ripple), failing to set ISET1/ISET2 within the 50-250 mA range, and connecting the LED strings in reverse polarity. According to TI datasheet, the enable pin (EN) must be tied high for normal operation; leaving it floating can cause intermittent start-up. Do not exceed the 65 V boost output rating.
معلومات الامتثال
AEC-Q100 qualified for the LM3492-Q1 family variant; standard LM3492HCQMHX/NOPB is the non-automotive-grade part. RoHS compliant per TI product page. REACH compliance confirmed by TI.
