MAX20078ATE+T - 65V Sync Buck LED Controller, AEC-Q100 | ADI
部品番号: MAX20078ATE+T ✓ 生産中| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $4.18 | $4.18 |
| 10 | $3.79 | $37.90 |
| 100 | $2.84 | $284.00 |
| 500 | $2.21 | $1,105.00 |
| 1,000 | $1.88 | $1,880.00 |
| 2,500 | $1.62 | $4,050.00 |
MAX20078ATE+T 概要
An LED driver controller is a switching power supply IC that regulates current through one or more LEDs by modulating an external MOSFET in a buck topology. The MAX20078 sits in the broader category hierarchy of LED driver -> power management IC -> semiconductor, and uses inductor current sensing rather than output current sensing for tighter regulation. Its average current-mode control, lack of compensation-network requirement, and 1 MHz switching capability place it among the most integrated high-brightness LED controllers in its class.
Key features include a 4.5V to 65V input supply range that supports 12V, 24V, and 48V automotive and industrial buses; analog and PWM dimming inputs; integrated high-side and low-side gate drivers for synchronous n-channel MOSFETs; an internal voltage regulator for VCC; and a programmable switching frequency up to 1 MHz. The device supports LED strings up to 60V and is qualified to AEC-Q100 for automotive front-light, daytime-running, and signal-lighting applications. Hysteretic-average current-mode control delivers fast transient response without the type-II/type-III compensation network typical of peak-current-mode parts.
Typical applications include automotive headlamp LED drivers, daytime running lights, turn signals, industrial 24V LED lighting, signage, architectural dimmable fixtures, and high-brightness LED arrays in agricultural or machine-vision illumination. The wide input range, AEC-Q100 qualification, and small TQFN-16 footprint make it equally suited to space-constrained automotive front-end PCBs and high-density industrial drivers.
When designing with the MAX20078, choose the external MOSFET RDS(on), inductor saturation current, and output-capacitor ESR to handle the peak inductor ripple at the programmed switching frequency. Place the input bypass capacitor directly at the BST and IN pins and keep the high-current loop area small. The exposed pad must be soldered to a continuous ground plane for thermal dissipation.
This page synthesizes distributor pricing as of 2026-10-09, AEC-Q100-qualified same-family drop-in alternatives, and PCB-layout design notes that go beyond the manufacturer datasheet.
ドロップイン代替品: MAX20078ATE+T — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
クイック比較ツール — 並列比較する代替部品を選択:
MAX20078ATE/V+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX20078ATE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX20087ATPA/VY+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX20049ATEA/VY+T
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX20078ATE/V+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX20078ATE+T 最大定格＆電気的特性
| トポロジー | Synchronous Buck (Step-Down) LED Controller |
| 出力数 | 1 |
| 入力電圧範囲 | 4.5 V to 65 V |
| スイッチング周波数 | Up to 1 MHz |
| Output Current (Gate Drive) | 10 mA |
| Internal Switches | None (drives external n-channel MOSFETs) |
| Dimming Control | Analog and PWM |
| Control Method | Proprietary average current-mode control (no compensation) |
| MOSFET Drive | Synchronous high-side and low-side n-channel gate drivers |
| パッケージ | 16-pin TQFN (3x3 mm) with exposed pad |
| 実装タイプ | Surface Mount |
| 動作温度範囲 | -40 C to +125 C |
| Automotive Qualification | AEC-Q100 |
| RoHS ステータス | Compliant |
MAX20078ATE+T ピン構成
| ピン 1 | BST — Boost capacitor connection for high-side gate driver |
| ピン 2 | LX — Inductor switching node (connected to high-side FET drain and low-side FET source) |
| ピン 3 | IN — Input supply voltage (4.5V to 65V) |
| ピン 4 | GND — Ground (exposed pad is also ground) |
| ピン 5 | N.C. — Not connected (per datasheet) |
| ピン 6 | CS — Current sense positive input (high-side) |
| ピン 7 | CSN — Current sense negative input (low-side return) |
| ピン 8 | DIM — PWM dimming input (active high) |
| ピン 9 | ADJ — Analog dimming input (0 to 1.5V) |
| ピン 10 | RT — Switching frequency programming resistor |
| ピン 11 | EN — Enable input (active high) |
| ピン 12 | VCC — Internal 5V LDO output (bypass with 1uF ceramic) |
| ピン 13 | COMP — Internal compensation node (do not load externally) |
| ピン 14 | REF — Reference voltage output (1.5V typical) |
| ピン 15 | PGND — Power ground for low-side gate driver |
| ピン 16 | DL — Low-side gate driver output |
主な用途
MAX20078ATE+T の用途: 6 件s: Automotive Headlamp LED Driver, Daytime Running Light (DRL) Driver, Industrial 24V LED Lighting Fixture, Architectural Dimmable LED Downlight, Agricultural High-Brightness LED Array, Rear Combination Lamp and Turn Signal.
Automotive Headlamp LED Driver
The MAX20078ATE+T is a strong fit for 12V/24V automotive headlamp LED drivers because it operates from 4.5V to 65V and is AEC-Q100 qualified, tolerating cold-crank and load-dump transients on the vehicle bus. Its 1 MHz switching frequency keeps the fundamental EMI above the AM broadcast band, easing CISPR 25 Class 5 compliance for front-lighting modules. With analog and PWM dimming inputs, the IC supports daylight-running, low-beam, and high-beam modes from a single driver PCB, replacing multiple discrete LED controllers. Synchronous n-channel gate drivers deliver >95% efficiency at full LED current, reducing thermal stress on the headlamp housing.
おすすめ
Daytime Running Light (DRL) Driver
The MAX20078ATE+T suits DRL applications where compact PCB area and AEC-Q100 qualification are mandatory. Its 16-pin TQFN (3x3 mm) footprint frees board space for the DRL module's tight mechanical envelope, while the 65V input rating tolerates 24V truck-bus environments. The proprietary average current-mode control eliminates the type-III compensation network typical of peak-current-mode parts, reducing BOM cost. PWM dimming at the DIM pin supports DRL-to-position-light transitions without color-temperature shift, preserving daytime visibility signatures.
おすすめ
Industrial 24V LED Lighting Fixture
The MAX20078ATE+T's 4.5V to 65V input range makes it ideal for 24V industrial lighting fixtures on factory automation buses and 48V PoE-powered luminaires. Synchronous rectification achieves high efficiency across the wide VIN range, while 1 MHz switching shrinks the output inductor and capacitor size compared with 200 kHz legacy designs. The exposed-pad TQFN-16 package dissipates gate-drive losses into a copper ground pour without a heatsink. Analog dimming via 0 to 1.5V on the ADJ pin interfaces with industrial 0-10V dimmers via a simple resistor network.
おすすめ
Architectural Dimmable LED Downlight
For architectural dimmable downlights requiring smooth 1% to 100% dimming without color shift, the MAX20078ATE+T provides PWM dimming that preserves LED color temperature even at very low duty cycles. The wide 4.5V-65V input accepts 12V AC-DC adapters and 48V constant-voltage LED magnetic-driver rails, simplifying SKU consolidation. Synchronous MOSFET driving reduces EMI below 30 MHz, easing residential EMI compliance. The exposed pad allows 1.5W continuous LED drive without additional thermal management.
おすすめ
Agricultural High-Brightness LED Array
The MAX20078ATE+T drives multi-amp LED arrays used in greenhouse supplemental lighting and horticulture fixtures where high efficiency and 0-10V analog dimming are required. Its 65V input accommodates 48V DC microgrid architectures common in commercial greenhouses, while synchronous rectification maintains >93% efficiency at full load. The exposed-pad package handles gate-drive dissipation during PWM flicker cycles used for photosynthetic spectrum tuning. AEC-Q100 qualification is overkill here but provides headroom for harsh greenhouse humidity and temperature cycling.
おすすめ
Rear Combination Lamp and Turn Signal
The MAX20078ATE+T suits rear combination lamps (tail, brake, turn signal) because of its AEC-Q100 grade, 4.5V-65V input, and small PCB footprint that fits behind the lamp reflector. PWM dimming supports tail-vs-brake intensity differentiation without additional constant-current ICs. Synchronous buck operation eliminates bulky inductor-rectifier combinations, reducing module weight for the rear-lamp housing. The exposed pad is solderable to a copper slug that doubles as a heat-spreader through the lamp body.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX20078ATE+T — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX20078ATE/V+T | MAX20078ATE+ | MAX20087ATPA/VY+ | MAX20049ATEA/VY+T | MAX20078ATE/V+ |
|---|---|---|---|---|---|---|
| Package | TQFN-16 (3x3) with exposed pad | TQFN-16 (3x3) - same | TQFN-16 (3x3) - same | TQFN-16 - same | TQFN-16 - same | TQFN-16 (3x3) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Input Voltage Range | 4.5 V to 65 V | 4.5 V to 65 V | 4.5 V to 65 V | 4.5 V to 65 V | 4.5 V to 36 V (lower) | 4.5 V to 65 V |
| Switching Frequency | Up to 1 MHz | Up to 1 MHz | Up to 1 MHz | Up to 1 MHz | Up to 1 MHz | Up to 1 MHz |
| AEC-Q100 Qualified | Yes | Yes (extended grade) | Yes | Yes | Yes | Yes (extended grade) |
| PWM Dimming | Yes (DIM pin) | Yes | Yes | Yes | Yes | Yes |
| Topology | Synchronous Buck LED Controller | Synchronous Buck | Synchronous Buck | Synchronous Buck | Synchronous Buck | Synchronous Buck |
| Operating Temperature | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C | -40 C to +125 C |
主な差別化要因
- No-compensation average current-mode control （vs MAX20049ATEA/VY+T)
- Wider input voltage range （vs MAX20049ATEA/VY+T)
- Higher switching frequency for smaller magnetics （vs MAX20087ATPA/VY+)
- Synchronous high-side/low-side gate drivers integrated （vs MAX20049ATEA/VY+T)
- AEC-Q100 qualification with extended grade option （vs MAX20078ATE+)
設計ノート
Route the high-current loop (IN -> high-side MOSFET -> inductor -> low-side MOSFET -> PGND) on the top layer with minimum loop area. Place the input ceramic bypass capacitor (4.7uF X7R minimum, 10uF recommended) within 5 mm of the IN pin and the exposed pad to a continuous ground plane. Keep the LX node copper area small to minimize radiated EMI; the BST capacitor must sit within 3 mm of the BST pin.
Estimated: at VIN=24V, VLED=12V string, and IOUT=1.5A through an external MOSFET pair with 50 mOhms total RDS(on), gate-drive loss plus switching loss is approximately 0.4W dissipated in the MAX20078ATE+T. With theta_JA of approximately 38 C/W on a 1 square-inch copper pour on a 4-layer PCB, junction temperature rises about 15C above ambient - well within the 125C rating but requires the exposed pad to be soldered.
Route the CS and CSN differential traces as a matched pair with 0.5 mm spacing and place a 100-ohm differential impedance filter at the IC pins to reject high-frequency LX-node coupling. Use Kelvin connection to the current-sense resistor to avoid ground bounce. The CSN trace must return directly to the sense resistor ground side, not to the PGND plane, to prevent switching-noise injection into the current loop.
Do not exceed 65V on the IN pin - load-dump transients on 24V automotive systems can spike above 70V without external TVS protection. Add a 65V TVS diode (e.g., SMAJ58A) from IN to GND if the input bus is unprotected. Also ensure the BST-to-LX voltage stays below the 5V abs-max rating by selecting a BST capacitor value per the datasheet formula.
The DIM pin is a digital input with a 1V/2V logic threshold; route the PWM trace away from the LX node to prevent false triggering from switching noise. Add a 10 kOhm pull-down on DIM if it is driven by an open-drain source. The ADJ analog input has high impedance - guard the trace with ground copper on both sides to prevent leakage into the dimming reference.
コンプライアンス情報
AEC-Q100 qualified per manufacturer datasheet. RoHS compliant per Analog Devices product page. Halogen-free status not explicitly listed in retrieved data - marked unknown.
