LM3492HCQMH/NOPB - 2-Ch Dimmable Boost LED Driver | TI
料号： LM3492HCQMH/NOPB ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.7813 | $4.78 |
| 10 | $3.4531 | $34.53 |
| 100 | $3.0547 | $305.47 |
| 500 | $2.9219 | $1,460.95 |
| 1,000 | $2.7891 | $2,789.10 |
LM3492HCQMH/NOPB 概述
A boost LED driver IC is a type of switching DC-DC power converter that steps up an input voltage to a higher output voltage while precisely regulating the current through one or more LED strings. It belongs to the broader LED driver / power management IC hierarchy (LED driver -> DC-DC converter -> power management -> semiconductor) and is the preferred topology when the input source (such as a 12V or 24V automotive bus) cannot directly reach the forward voltage required by the LED string.
Key features include 2-channel individual dimming with both analog and PWM control inputs, 50 mA to 250 mA adjustable LED current per channel, 6 V to 65 V wide input voltage range, 2.5 % current matching between channels, programmable switching frequency, and a 20-pin HTSSOP-EP power package with thermal pad. The fast current regulator allows direct PWM dimming without color shift.
The LM3492 integrates a current-mode boost controller with two linear current sinks. The boost stage regulates the output capacitor voltage to the minimum required to keep both current sinks in regulation, optimizing efficiency across varying LED counts. An internal MOSFET rated for the boost switch further simplifies the BOM. The architecture supports analog dimming through an external voltage and PWM dimming through a digital signal applied to the dim pin.
Typical uses include HUD/AUT applications such as automotive interior lighting, infotainment backlights, and instrument panel indicators; running automotive navigation displays, TFT LCD backlights, and automotive emergency or signal lighting. Each channel can be tuned for brightness independent of the fan.
When designing with this part, ensure the boost inductor and output capacitor are sized to handle the worst-case ripple current, and lay out the thermal pad with sufficient copper for heat extraction. Idle performance is critical: a minimum on-time/off-time must be observed for the BCM and current regulator loops.
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： LM3492HCQMH/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： LM3492HCQMH/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：
LM3492HCQMHX/NOPB
✓ 有现货
$2.62 / 个
查看数据手册 →LM3492QMH/NOPB
📋 参考替代料（不在目录中）
LM3492HCQ1MH/NOPB
📋 参考替代料（不在目录中）
LM3492HCQ1MHX/NOPB
📋 参考替代料（不在目录中）
LM3492HCQMH/NOPB 最大额定值与电气特性
| 拓扑 | Boost (Step-Up) |
| Number of Channels | 2 |
| LED Current per Channel | 50 mA to 250 mA |
| 输入电压范围 | 6 V to 65 V |
| Output Voltage (Boost Max) | 65 V |
| 开关频率 | Programmable, up to 1 MHz typical |
| Dimming Control | Analog + PWM |
| Current Matching | 2.5 % (typical) |
| 封装 | HTSSOP-20 EP (PowerPAD) |
| 工作温度范围 | -40 C to +125 C |
| 安装类型 | Surface Mount |
| MSL 等级 | 2 |
| Automotive Grade | AEC-Q100 (Q suffix) |
| RoHS 状态 | Compliant |
| Lead-Free | Yes |
LM3492HCQMH/NOPB 引脚配置
| 引脚 1 | VIN — Input voltage supply (6V to 65V) |
| 引脚 2 | EN — Enable input |
| 引脚 3 | RT — Timing resistor for switching frequency |
| 引脚 4 | COMP — Compensation network |
| 引脚 5 | DIM — PWM dimming input |
| 引脚 6 | ADJ — Analog dimming adjustment |
| 引脚 7 | VREF — Reference voltage output |
| 引脚 8 | GND — Ground |
| 引脚 9 | FB — Feedback for boost output |
| 引脚 10 | I1 — LED current sink channel 1 |
| 引脚 11 | I1 — LED current sink channel 1 (return) |
| 引脚 12 | NC — Not connected |
| 引脚 13 | SW — Boost switch node |
| 引脚 14 | BST — Bootstrap for gate driver |
| 引脚 15 | NC — Not connected |
| 引脚 16 | VOUT — Boost output voltage |
| 引脚 17 | I2 — LED current sink channel 2 |
| 引脚 18 | I2 — LED current sink channel 2 (return) |
| 引脚 19 | NC — Not connected |
| 引脚 20 | PGND — Power ground |
典型应用
LM3492HCQMH/NOPB 适用于 6 应用s: Automotive Daytime Running Lights (DRL), TFT LCD Backlight Driver, Industrial Signage and Channel Letters, Emergency and Beacon LED Indicators, RGB or Dual-Color LED Lighting, Automotive Infotainment Backlight.
Automotive Daytime Running Lights (DRL)
The Texas Instruments LM3492HCQMH/NOPB's two-channel individual dimming and 6V to 65V wide input range make it ideal for automotive DRL applications where each LED string must be brightness-controlled independently from a 12V or 24V battery bus. AEC-Q100 grade ensures operation across -40C to +125C ambient with full automotive EMI/surge robustness. The fast current regulator delivers constant current up to 250 mA per string with 2.5% channel matching, ensuring uniform brightness across both DRL modules. The HTSSOP-20 EP package with exposed thermal pad handles the boost converter's switching losses at typical 200-500 mA load.
推荐
TFT LCD Backlight Driver
The Texas Instruments LM3492HCQMH/NOPB's 2-channel dimmable boost architecture is purpose-built for TFT LCD backlight designs where two parallel LED chains drive the panel edges. PWM dimming on the DIM pin enables seamless 1%-100% brightness control without color shift, which is critical for handheld and industrial displays requiring wide dimming range. The boost converter generates the 30-50V rail required for 8-12 series white LEDs per string from a single 12V input. Per-channel current matching of 2.5% ensures uniform luminance across both backlight halves, eliminating visible bright spots on the panel.
推荐
Industrial Signage and Channel Letters
The Texas Instruments LM3492HCQMH/NOPB delivers reliable LED driving for industrial channel letter and architectural signage where two strings must be brightness-balanced across the sign. The 6V to 65V wide input range accepts industrial 24V and 48V bus voltages directly, eliminating intermediate regulators and reducing BOM cost. Boost converter integrated with current sinks minimizes PCB area in space-constrained signage housings. AEC-Q100 grade combined with -40C to +125C ambient rating supports harsh outdoor installations where temperature variation stresses the driver.
推荐
Emergency and Beacon LED Indicators
The Texas Instruments LM3492HCQMH/NOPB's AEC-Q100 grade and individual PWM dimming per channel make it well-suited for emergency vehicle beacon and warning light applications. Each channel can be modulated independently for strobe patterns without external MOSFETs, simplifying the strobe controller. The wide input voltage range accepts 12V and 24V emergency-vehicle electrical systems including load-dump transients up to 65V. Thermal performance of the HTSSOP-20 EP PowerPAD package enables sustained operation at high ambient temperatures inside sealed warning light housings.
推荐
RGB or Dual-Color LED Lighting
The Texas Instruments LM3492HCQMH/NOPB's two independently dimmable channels enable RGB lighting and dual-color applications where one string runs a warm white LED chain and the other runs a cool white or RGB chain. Each channel can be set to a different current level via the IADJ resistor, allowing precise color mixing. PWM dimming on the DIM pin enables color-temperature tuning between warm and cool channels. The boost converter maintains minimum headroom across both strings even as one string's forward voltage drops with temperature.
推荐
Automotive Infotainment Backlight
The Texas Instruments LM3492HCQMH/NOPB delivers precision dual-string LED driving for automotive infotainment displays where one channel powers the main TFT backlight and the other powers auxiliary indicator LEDs. AEC-Q100 grade is required by automotive OEMs for head-unit displays. PWM dimming range of 1% to 100% with no color shift enables smooth brightness adjustment across day/night driving modes without flicker. Boost topology accepts the 12V head-unit supply and generates the 30-50V rail required for 8-12 series LEDs per string.
推荐
推荐产品汇总
工程参考数据： LM3492HCQMH/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 | LM3492HCQMHX/NOPB | LM3492QMH/NOPB | LM3492HCQ1MH/NOPB | LM3492HCQ1MHX/NOPB |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | HTSSOP-20 EP | HTSSOP-20 EP - same | HTSSOP-20 EP - same | HTSSOP-20 EP - same | HTSSOP-20 EP - same |
| Number of Channels | 2 | 2 | 2 | 2 | 2 |
| LED Current per Channel | 50 mA to 250 mA | 50 mA to 250 mA | 50 mA to 250 mA | 50 mA to 250 mA | 50 mA to 250 mA |
| Input Voltage Range | 6 V to 65 V | 6 V to 65 V | 6 V to 65 V | 6 V to 65 V | 6 V to 65 V |
| AEC-Q100 Grade | Yes | Yes | No | Yes (Q1 designation) | Yes (Q1 designation) |
| Packaging Format | Tube | Tape & Reel | Tube | Tube | Tape & Reel |
| RoHS Status | Compliant | Compliant | Compliant | Compliant | Compliant |
关键差异点
- Integrated 2-channel boost + dual current sinks in single IC （对比 Discrete boost + 2x LM3414 single-channel drivers)
- AEC-Q100 qualified with -40C to +125C operation （对比 Industrial-grade LED drivers without AEC-Q100)
- Wide 6V to 65V input voltage range （对比 12V-only LED drivers)
设计说明
The HTSSOP-20 EP package features an exposed thermal pad (pin 21) that MUST be soldered to a copper pour of at least 1 square inch for thermal dissipation. Estimated: at VIN=24V, VOUT=40V, ILED=200 mA per channel, total power dissipation is approximately 1.6W; without copper heatsinking, junction temperature rise above the 31.4 C/W theta_JA baseline could exceed 50C, requiring derating. Source: TI LM3492 datasheet thermal performance section.
Place the boost inductor, input capacitor, and output capacitor as close to the IC as possible to minimize switching noise coupling. Use a 4-layer PCB with a dedicated ground plane under the boost switch node (SW pin) and bootstrap capacitor (BST pin). Route the LED current sink traces (I1, I2) as Kelvin connections directly at the chip pads to ensure accurate current regulation. Keep the analog ground (GND) and power ground (PGND) separate, joining only at the IC's ground pin.
Do not exceed the absolute maximum VIN of 65V - load-dump transients on automotive 12V buses can spike above 40V. Ensure the BST capacitor is a 100 nF ceramic placed within 2 mm of the BST and SW pins. The RT resistor value must be chosen for the desired switching frequency per the datasheet's RT-vs-frequency curve; values outside the recommended range can cause sub-harmonic oscillation. The DIM pin voltage must not exceed 5.5V or the internal ESD protection may be damaged.
合规信息
AEC-Q100 qualified per TI product page. RoHS compliant. Halogen-free status not explicitly stated in the verified data.
