LM3492HCQMHX/NOPB - 2-Ch Boost LED Driver, 65V/200mA | TI
料号： LM3492HCQMHX/NOPB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.2 | $4.20 |
| 10 | $3.78 | $37.80 |
| 100 | $3.36 | $336.00 |
| 500 | $2.94 | $1,470.00 |
| 1,000 | $2.62 | $2,620.00 |
LM3492HCQMHX/NOPB 概述
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.
直接替换替代料： LM3492HCQMHX/NOPB ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： LM3492HCQMHX/NOPB （相同外形与封装尺寸） ——差异在于 Automotive Grade, Package, Switching Frequency, Topology.
快速对比工具——选择替代料号进行并排对比：
LM3492HCQMH/NOPB
✅ 直接替换✓ 有现货
$2.7891 / 个
查看数据手册 →LM3492HCQMHXSLASHNOPB.B
✅ 直接替换📋 参考替代料（不在目录中）
LM3492HCQMH/NOPB
✅ 直接替换✓ 有现货
$2.7891 / 个
查看数据手册 →LM3423Q0MHX/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
LM3492HC/-Q1
✅ 直接替换📋 参考替代料（不在目录中）
LM3492HCQMHX/NOPB 最大额定值与电气特性
| 拓扑 | Step-Up (Boost) DC-DC Converter with Current Regulator |
| 输出数量 | 2 (independent dimmable channels) |
| 输出电压 - 最大 | 65 V |
| Per-Channel LED Current | 50 mA to 250 mA |
| Maximum LED Power | 15 W per channel |
| 开关频率 | 200 kHz to 1 MHz (programmable) |
| Dimming Method | Independent Analog/PWM per channel |
| 电源电流 | 5200 uA (typical, per datasheets.com listing) |
| 封装 | 20-Pin HTSSOP-EP (PWP), 4.40 mm width |
| 安装类型 | Surface Mount |
| 工作温度 | -40C to +125C |
| 引脚数量 | 20 |
| Packaging | Tape & Reel |
| Automotive Grade | AEC-Q100 qualified (LM3492-Q1 family) |
| RoHS 状态 | Compliant |
LM3492HCQMHX/NOPB 引脚配置
| 引脚 1 | VIN — Input supply voltage |
| 引脚 2 | BST — Bootstrap capacitor for high-side gate drive |
| 引脚 3 | HG — High-side gate drive output |
| 引脚 4 | SW — Switching node (external L/FET connection) |
| 引脚 5 | PGND — Power ground |
| 引脚 6 | LG — Low-side gate drive output |
| 引脚 7 | VCC — Internal regulator output / decoupling |
| 引脚 8 | RT — Switching frequency programming resistor |
| 引脚 9 | COMP — Compensation network node |
| 引脚 10 | FB — Boost output voltage feedback |
| 引脚 11 | DIM1 — Channel 1 dimming input (analog/PWM) |
| 引脚 12 | DIM2 — Channel 2 dimming input (analog/PWM) |
| 引脚 13 | ISET1 — Channel 1 LED current setpoint |
| 引脚 14 | ISET2 — Channel 2 LED current setpoint |
| 引脚 15 | SNS1 — Channel 1 LED current sense input |
| 引脚 16 | SNS2 — Channel 2 LED current sense input |
| 引脚 17 | EN — Enable input (active high) |
| 引脚 18 | AGND — Analog ground |
| 引脚 19 | NC — Not connected (per datasheet) |
| 引脚 20 | NC — Not connected (per datasheet) |
典型应用
LM3492HCQMHX/NOPB 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： LM3492HCQMHX/NOPB ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Two-channel independent dimming in a single 20-pin IC （对比 LM3423Q0MHX/NOPB)
- Integrated 65 V boost converter eliminates external controller （对比 Discrete boost + LM3405 LED driver)
- Wide 200 kHz to 1 MHz programmable switching range （对比 LM3405XMKX/NOPB)
设计说明
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.
合规信息
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.
