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Analog Devices Inc./Maxim Integrated MAX20078ATE+TW
- Part No.:
- MAX20078ATE+TW
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX20078ATE+TW.pdf
- Description:
- IC LED DRVR CTRL PWM 10MA 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,663
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Product details
Overview
The MAX20078ATE+TW from Maxim Integrated is a high-voltage, synchronous n-channel MOSFET controller for automotive-grade high-current buck LED drivers. It implements proprietary average current-mode control with no loop compensation required, operates from 4.5V to 65V input, supports up to 1MHz switching frequency, and integrates dual 2A gate drivers for matrix lighting systems in front headlights.
For engineers reviewing the MAX20078ATE+TW datasheet, MAX20078ATE+TW pinout, MAX20078ATE+TW application, or MAX20078ATE+TW equivalent, key selection considerations include its AEC-Q100 qualification, analog/PWM dimming support, open/short LED fault detection, and 3mm × 3mm TQFN-EP package optimized for thermally demanding automotive lighting layouts.
Technical Context
The MAX20078ATE+TW uses average current-mode control that senses bottom-FET current (via CSP/CSN) instead of inductor current directly-enabling stable regulation without external compensation components while maintaining near-constant switching frequency across input and load variations. Its adaptive dead-time logic prevents shoot-through by dynamically adjusting DH-to-DL and DL-to-DH transitions.
It integrates a 5V/10mA VCC regulator, a current monitor (IOUTV = 5 × ILED × RCS + 0.2V), and fault flag (FLT) reporting open LED (≥325mV REFI), short circuit (≤50mV OUT), overvoltage (≥3.0V at OUT), and thermal shutdown (165°C). Dimming is supported via analog voltage (REFI: 0.2–1.2V) and PWM (DIM pin with 200ms shutdown timer).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 65V - enables direct connection to automotive battery rails including cold-crank and load-dump transients. |
| Switching Frequency | Up to 1MHz - allows compact magnetics and EMI filtering; programmable via R1/C1 on TON pin. |
| Gate Drive Capability | 2A peak source/sink on DH/DL - drives high-Qg automotive MOSFETs (e.g., BUK9Y107-80E) with controlled slew rates. |
| VCC Regulator | 5.0V ±150mV @ 10mA - powers external gate drivers and bias circuitry; eliminates need for auxiliary LDO. |
| Fault Detection | Open LED (REFI > 325mV), short LED (OUT < 50mV), OVP (OUT > 3.0V), thermal shutdown (165°C) - all asserted on open-drain FLT pin. |
| Dimming Interface | Analog (REFI: 0.2–1.2V linear LED current control) + PWM (DIM: 2.0V rise / 0.8V fall thresholds) - supports >1000:1 dimming ratio. |
| Operating Temperature | −40°C to +125°C - qualified per AEC-Q100 Grade 1, suitable for under-hood and headlamp module placement. |
Pinout & Package
MAX20078ATE+TW is housed in a thermally enhanced 16-pin TQFN-EP package (3mm × 3mm, 0.5mm pitch) with exposed pad connected to AGND for efficient heat dissipation in high-power LED driver PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | High-side bootstrap supply | Connects 0.1µF ceramic capacitor to LX; supplies gate drive for high-side n-MOSFET during bootstrapping cycle. |
| DH | High-side gate driver output | Drives gate of external high-side n-MOSFET; 2A peak sink/source capability with adaptive dead-time control. |
| LX | Switching node | Connects to inductor and source of low-side MOSFET; carries high di/dt buck switching waveform. |
| IN | Main power input | Accepts 4.5V–65V DC input; bypassed with ≥2.2µF ceramic capacitor to PGND for stability and ripple suppression. |
| DIM | PWM dimming control | TTL-compatible input; asserts shutdown after 200ms low state; enables/disables switching synchronously with PWM signal. |
| TON | Frequency programming | Resistor-to-IN and capacitor-to-AGND set switching frequency (100kHz–1MHz); determines tON ramp slope. |
| OUT | Output voltage feedback | Accepts resistor divider from LED string output; sets overvoltage threshold (3.0V) and regulates output voltage scaling. |
| REFI | Analog dimming input | 0.2–1.2V analog control voltage; linearly sets LED current (ILED = (VREFI − 0.2)/(5 × RCS)); clamped at 1.3V max. |
| AGND | Analog ground reference | Separate low-noise ground for REFI, OUT, IOUTV, and internal analog blocks; must be star-connected to PGND at single point. |
| IOUTV | Inductor current monitor | Analog voltage output (5 × ILED × RCS + 0.2V); sampled only when DL is high; used for diagnostics and closed-loop monitoring. |
| FLT | Fault indicator | Active-low open-drain output; asserts low on open LED, short LED, OVP, thermal shutdown, or DIM-induced shutdown. |
| CSP / CSN | Current sense inputs | Differential pair sensing current through low-side MOSFET source resistor (RCS); enables lossless current sensing without high-side shunt. |
| PGND | Power ground return | High-current return path for IN, LX, and MOSFET sources; must be low-impedance copper plane tied to EP. |
| VCC | Internal 5V regulator output | Supplies 10mA max; powers gate drivers and external circuitry; bypassed with ≥2.2µF ceramic cap to AGND. |
| DL | Low-side gate driver output | Drives gate of external low-side n-MOSFET; includes sample-and-hold control for IOUTV generation. |
Key Features
| Feature | Design Value |
|---|---|
| Average current-mode control | Eliminates external compensation network while maintaining stable regulation across wide VIN/VOUT ranges and temperature. |
| Integrated 5V/10mA VCC regulator | Reduces BOM count by powering external gate drivers and bias circuitry-no secondary LDO required. |
| Programmable 100kHz–1MHz switching | Enables optimization between efficiency (lower fSW) and solution size (higher fSW) without changing IC. |
| Matrix lighting support | Maintains inductor current regulation during individual LED shorting/opening-critical for adaptive driving beam (ADB) systems. |
| Comprehensive fault protection | Detects open/short LED strings, overvoltage, and thermal overload-all reported on single FLT pin with defined timing windows. |
Applications
| Automotive Front Lights | Automotive Matrix Lights |
|---|---|
|
Use Scenario: High-brightness LED headlamps requiring precise current regulation and robust fault handling in harsh under-hood environments. IC Role / Device Role / Timing Role: Synchronous buck LED controller managing up to 2A LED current with analog/PWM dimming and real-time current monitoring via IOUTV. Use Value: AEC-Q100 qualification and −40°C to +125°C operation ensure reliability; integrated OVP and open/short detection reduce system-level diagnostic complexity. |
Use Scenario: Adaptive driving beam (ADB) modules where individual LEDs in a string are dynamically shorted to shape light patterns. IC Role / Device Role / Timing Role: Current-regulated buck controller maintaining stable inductor current even during rapid LED shorting events, enabled by ultrafast-response control loop. Use Value: Prevents overshoot/undershoot during LED switching; supports >1000:1 dimming ratio essential for glare-free ADB functionality. |
| Head-Up Displays | Constant-Current Regulators |
|
Use Scenario: Compact HUD illumination systems needing low EMI, high efficiency, and tight current accuracy in space-constrained dashboards. IC Role / Device Role / Timing Role: High-frequency (up to 1MHz) buck controller minimizing inductor size while delivering stable LED current with <±3% accuracy over temperature. Use Value: Small 3mm × 3mm TQFN-EP package and integrated VCC regulator simplify layout; analog dimming enables smooth brightness transitions. |
Use Scenario: Industrial or commercial constant-current LED drivers requiring long-term stability and fault resilience in non-automotive settings. IC Role / Device Role / Timing Role: Precision current-mode controller using CSP/CSN sensing to regulate output current independent of LED forward voltage variation. Use Value: No loop compensation reduces design iterations; thermal shutdown and overvoltage protection enhance field reliability without added discrete components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage synchronous buck LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMM/NOPB | Operates up to 75V input; uses peak current-mode control requiring external compensation; no integrated VCC regulator (needs external 5V supply). | Lacks analog dimming (REFI) and integrated current monitor (IOUTV); fault reporting limited to thermal shutdown only. | Preferred where higher input voltage margin is critical and system already provides 5V bias; less suitable for matrix lighting due to slower transient response. |
| TPS92692QPWPRQ1 | AEC-Q100 Grade 1; integrates 75V high-side driver and 5V LDO; uses current-mode control with internal compensation; supports 100Hz–2MHz programmable frequency. | Includes built-in spread-spectrum EMI reduction and enhanced PWM dimming resolution; lacks dedicated open/short LED detection on FLT pin. | Better for EMI-sensitive HUD or interior lighting; requires different PCB layout due to larger HTSSOP-20 package and distinct pinout. |
Compared with LM3409HVMM/NOPB and TPS92692QPWPRQ1, the MAX20078ATE+TW uniquely combines average current-mode control (no compensation), integrated 5V/10mA VCC, and comprehensive LED fault detection (open/short/OVP/thermal) in a 3mm × 3mm footprint-making it optimal for space-constrained, safety-critical automotive front lighting.
Availability
MAX20078ATE+TW is available at Aetrix Electronics and suitable for automotive front lights, matrix lighting systems, head-up displays, and industrial constant-current LED regulators requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX20078ATE+TW 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications applications.
The MAX20078ATE+TW belongs to Maxim's automotive LED driver product line, engineered specifically for AEC-Q100-compliant high-brightness buck controllers in adaptive front lighting systems requiring robust fault coverage and minimal external components.
FAQ
What is the maximum input voltage supported by the MAX20078ATE+TW?
The MAX20078ATE+TW supports an absolute maximum input voltage of +70V on the IN pin, with guaranteed operation across 4.5V to 65V. This range accommodates automotive battery transients including cold-crank (down to ~6V) and load-dump (up to 65V), making it suitable for direct connection to vehicle electrical systems without additional pre-regulation.
Does the MAX20078ATE+TW require external compensation components for its control loop?
No, the MAX20078ATE+TW does not require external compensation components. Its proprietary average current-mode control architecture eliminates the need for loop compensation while maintaining stable regulation and near-constant switching frequency across input voltage, output voltage, and temperature variations-reducing design complexity and BOM count.
How does the MAX20078ATE+TW detect open and short conditions in the LED string?
The MAX20078ATE+TW detects open LED conditions when the IOUTV voltage drops below 75% of its target value for >1.2ms (requires REFI > 325mV), and short conditions when the OUT pin voltage falls below 50mV for >1.2ms. Both faults assert the open-drain FLT pin low, and detection occurs only when DIM is high-ensuring accurate reporting during active LED operation.
Can the MAX20078ATE+TW be used in matrix lighting applications with dynamic LED shorting?
Yes, the MAX20078ATE+TW is explicitly designed for matrix lighting. Its ultrafast-response control loop maintains stable inductor current regulation even when individual LEDs in the string are rapidly shorted or opened-preventing current overshoot/undershoot and enabling precise adaptive driving beam (ADB) functionality without compromising system reliability.
What is the function of the TON pin on the MAX20078ATE+TW?
The TON pin on the MAX20078ATE+TW programs the switching frequency from 100kHz to 1MHz by connecting an external resistor (R1) to the input supply and a capacitor (C1) to AGND. The ramp rate of C1 determines tON, and the resulting fSW follows fSW = (R2 + R3)/(C1 × R3 × R1), allowing flexible frequency selection without changing the IC or compensation network.
MAX20078ATE+TW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Type:
- DC DC Controller
- Topology:
- Step-Down (Buck)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- -
- Current - Output / Channel:
- 10mA
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX20078ATE+TW FAQ
1.How can I place an order for MAX20078ATE+TW through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX20078ATE+TW 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 MAX20078ATE+TW reliable?
The price and inventory of MAX20078ATE+TW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX20078ATE+TW is usually 5 days.
3.What payment methods are accepted for MAX20078ATE+TW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX20078ATE+TW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX20078ATE+TW?
MAX20078ATE+TW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX20078ATE+TW 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 MAX20078ATE+TW?
For technical support, including MAX20078ATE+TW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX20078ATE+TW requirements.
6.How does Aetrix verify that MAX20078ATE+TW is sourced from the original manufacturer or authorized distributors?
All MAX20078ATE+TW 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 MAX20078ATE+TW meets industry standards.
7.What is the process for return or replacement of MAX20078ATE+TW?
All MAX20078ATE+TW units undergo pre-shipment inspection (PSI). If there is an issue with MAX20078ATE+TW, 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 MAX20078ATE+TW part is unused and in its original packaging.
Return procedure for MAX20078ATE+TW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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