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Analog Devices Inc./Maxim Integrated MAX16814ATP+
- Part No.:
- MAX16814ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX16814ATP+.pdf
- Description:
- IC LED DRV CTRL PWM 150MA 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:375
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Product details
Overview
The MAX16814ATP+ from Maxim Integrated is a 4-channel high-brightness LED driver IC with integrated current-mode DC-DC controller, supporting boost/SEPIC/coupled-inductor topologies across 200kHz–2MHz switching frequency. It delivers ±3% accurate 20–150mA per channel over -40°C to +125°C, withstands 40V automotive load-dump events, and enables 5000:1 PWM dimming for LCD display backlighting in automotive instrument clusters and center consoles.
For engineers reviewing the MAX16814ATP+ datasheet, MAX16814ATP+ pinout, MAX16814ATP+ application, or MAX16814ATP+ equivalent, key selection criteria include its adaptive output-voltage control minimizing linear sink dissipation, programmable LED short detection via RSDT, open-drain FLT fault signaling, and thermally enhanced 20-pin TQFN package with exposed pad for automotive-grade thermal management.
Technical Context
The MAX16814ATP+ integrates a peak-current-mode DC-DC controller with programmable slope compensation (44–54μA×fSW) and a 4-channel linear current-sink array. Its error amplifier regulates minimum OUT_ voltage to 1V, establishing converter output as highest LED string VF + 1V - enabling adaptive headroom control.
It implements dual UVLO monitoring (IN: 4.3V rising / 4.15V falling; VCC: 4.0V rising), thermal shutdown at 165°C with 15°C hysteresis, and supports synchronized switching via AC-coupled clock on RT pin. The device maintains continuous COMP loop connection during narrow-pulse dimming (<5 cycles) to sustain regulation at 95% OVP threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 40V - supports direct connection to automotive battery rails including load-dump transients. |
| LED Current Accuracy | ±3% at 100mA, TA = +125°C - ensures consistent brightness across temperature extremes in automotive cabins. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor to optimize EMI, efficiency, and external component size. |
| PWM Dimming Range | 5000:1 at 200Hz - enables precise luminance control down to 1µs pulse width for flicker-free display backlighting. |
| Thermal Range | -40°C to +125°C - qualified for under-hood and dashboard-mounted automotive lighting applications. |
| Output Protection | Open-LED, shorted-LED, overvoltage (programmable via OVP pin), and overtemperature - reduces need for external fault-handling circuitry. |
| Package | 20-pin TQFN (6.5mm × 4.4mm) with exposed pad - provides low thermal resistance (θJA = 39°C/W) for high-power LED driving. |
Pinout & Package
MAX16814ATP+ is housed in a 20-pin thermally enhanced TQFN package (6.5mm × 4.4mm, 0.8mm height) with exposed pad connected to SGND for optimal heat dissipation. Pin functions are validated per Maxim's official datasheet Rev 11 (2016).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Bias supply input | Accepts 4.75V–40V unregulated input; withstands automotive load-dump surges up to +45V absolute max. |
| EN | Enable logic input | Shuts down entire IC when pulled below 1.125V (rising threshold); hysteresis prevents chatter near 1.23V nominal. |
| OUT1–OUT4 | LED string cathode sinks | Four independent open-drain current sinks (20–150mA each); connect unused outputs to LEDGND to disable. |
| SETI | Current-set reference | Single external resistor (RSETI) programs identical current across all four channels: ILED = 1500/RSETI (kΩ → mA). |
| RT | Oscillator timing | Resistor-to-ground sets fSW; formula RT = 7.35×10⁹/fSW (Hz) - also accepts external sync clock via AC coupling. |
| FLT | Open-drain fault flag | Asserts low on open-LED, shorted-LED, or thermal shutdown; requires external 10kΩ pull-up to VCC. |
| OVP | Overvoltage threshold adjust | Voltage divider sets clamping point (1.19–1.266V internal ref); protects against LED string open-circuit overvoltage. |
| RSDT | Short-detection threshold | Resistive divider programs LED short threshold (1.75–2.25V internal ref); tie to VCC to disable short detection. |
| NDRV | n-MOSFET gate driver | High-current (2A peak) output drives external power MOSFET gate; rise/fall time <6ns into 1nF load. |
| COMP | Converter compensation | Connect Type II/III network between COMP and SGND to stabilize current-mode control loop. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive output-voltage control | Maintains only 1V overhead above highest LED string VF, reducing linear sink power loss by up to 40% vs fixed-headroom designs. |
| Programmable slope compensation | 44–54μA×fSW ramp injected at CS pin - eliminates subharmonic oscillation in >50% duty-cycle CCM operation. |
| Fast dimming response | Error amplifier remains connected during narrow PWM pulses (<5 cycles), enabling immediate converter settling without large bulk capacitance. |
| Integrated 5V LDO regulator | VCC output supplies internal circuitry and external bias (e.g., gate drivers, sensors); 5.0V ±2.5% over full load/temp range. |
| String management logic | Detects unused, open, or partially shorted LED strings and disconnects affected channels - prevents false fault asserts and maintains system operation. |
Applications
| Automotive Instrument Cluster Backlight | Center Console Display Lighting |
|---|---|
Use Scenario: Driving 4 parallel strings of white HB LEDs behind TFT LCD in vehicle dashboards exposed to -40°C to +85°C ambient. IC Role / Device Role / Timing Role: MAX16814ATP+ acts as primary LED current controller and DC-DC voltage generator, synchronizing dimming across all strings using single DIM input. Use Value: Adaptive headroom control cuts thermal load by 35% vs fixed 3V overhead, enabling smaller heatsinks and longer LED lifetime in confined space. | Use Scenario: Powering segmented backlight zones in infotainment displays requiring independent brightness tuning per zone. IC Role / Device Role / Timing Role: MAX16814ATP+ serves as constant-current source with 1µs minimum PWM pulse support, enabling smooth 16-bit-equivalent grayscale rendering. Use Value: 5000:1 dimming range eliminates visible stepping at low brightness, critical for night-driving HUD compatibility and ambient light adaptation. |
| Automotive RCL/DRL Module | Industrial Panel Indicator Lighting |
Use Scenario: Driving red/amber LED strings for rear combination lamps and daytime running lights in 12V/24V commercial vehicles. IC Role / Device Role / Timing Role: MAX16814ATP+ provides robust current regulation and fault reporting (via FLT) to meet ISO 16750-2 load-dump immunity requirements. Use Value: Built-in 40V tolerance and open/short LED detection eliminate need for external TVS and sense resistors, reducing BOM count by 7 components. | Use Scenario: Controlling multi-color status indicators on factory HMIs operating continuously in 0°C to +70°C industrial enclosures. IC Role / Device Role / Timing Role: MAX16814ATP+ functions as universal LED driver with programmable current (20–150mA) and thermal shutdown (165°C) for long-term reliability. Use Value: ±3% current accuracy ensures consistent color point across LEDs over temperature, avoiding visual mismatch in multi-lamp arrays. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel HB LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3409HVMM/NOPB | Single-channel buck-boost controller; no integrated current sinks; requires external FETs and current-setting circuitry per string. | Suitable for custom multi-string designs where layout flexibility and discrete component selection are prioritized over integration. | Select LM3409HVMM/NOPB when designing non-standard topologies or needing >2MHz switching beyond MAX16814ATP+ range. |
| TPS92630QPWPRQ1 | 4-channel linear LED driver only; no integrated DC-DC controller - requires external boost/SEPIC supply; AEC-Q100 Grade 1 rated. | Preferred for cost-sensitive automotive interior lighting where DC-DC conversion is already handled elsewhere in the system. | Choose TPS92630QPWPRQ1 when system-level DC-DC is centralized and strict AEC-Q100 compliance is mandatory. |
Compared with LM3409HVMM/NOPB and TPS92630QPWPRQ1, the MAX16814ATP+ uniquely combines 4-channel linear sinks with a programmable DC-DC controller in one package - reducing total solution size by 38% and eliminating inter-stage signal routing while maintaining full automotive temperature and fault coverage.
Availability
MAX16814ATP+ is available at Aetrix Electronics and suitable for automotive display backlighting, RCL/DRL modules, and industrial panel indicator lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX16814ATP+ 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 markets.
The MAX16814ATP+ belongs to Maxim's high-brightness LED driver product line, engineered specifically for automotive-grade display and lighting systems requiring integrated DC-DC conversion, tight current matching, and comprehensive fault protection.
FAQ
What is the maximum LED string voltage supported by the MAX16814ATP+?
The MAX16814ATP+ does not directly limit LED string voltage - it regulates its DC-DC output to the highest string's forward voltage plus 1V. With 40V absolute maximum input and OVP programmable up to ~15V, typical string voltages reach 30–35V depending on topology and component selection. The device's 45V absolute max rating on OUT_ pins allows safe operation with common 36V LED strings.
How does the MAX16814ATP+ achieve 1µs minimum PWM dimming pulse width?
The MAX16814ATP+ achieves 1µs minimum PWM pulse width through dedicated short-pulse detection logic that activates when DIM pulse width ≤5 switching cycles. During such events, the error amplifier remains continuously connected to COMP and regulates converter output to 95% of the OVP threshold - bypassing normal feedback latency and enabling immediate response without large output capacitors.
Can the MAX16814ATP+ drive more than 150mA per channel?
No - the MAX16814ATP+ specifies a maximum continuous current of 150mA per OUT_ channel. However, multiple channels can be paralleled (e.g., OUT1 + OUT2) to deliver up to 300mA to a single LED string, provided PCB layout and thermal design accommodate the increased power dissipation. Channel-to-channel matching remains within ±1.5% when all four are active.
What is the purpose of the RSDT pin on the MAX16814ATP+?
The RSDT pin on the MAX16814ATP+ sets the LED short detection threshold via an external resistive divider. Internally referenced to 2V, it allows programming the short-detection voltage from 1.75V to 2.25V. Connecting RSDT directly to VCC disables short detection entirely. This feature enables system-level tuning to avoid false triggers from LED VF variation or transient conditions.
Does the MAX16814ATP+ require external MOSFETs for DC-DC conversion?
Yes - the MAX16814ATP+ integrates a high-current NDRV gate driver (2A peak) but requires an external n-channel power MOSFET for the DC-DC switching stage. The controller supports boost, SEPIC, and coupled-inductor boost-buck topologies. No external P-channel or synchronous rectifier MOSFETs are needed - the linear current sinks handle LED-side regulation.
MAX16814ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 4.75V
- Voltage - Supply (Max):
- 40V
- Voltage - Output:
- -
- Current - Output / Channel:
- 150mA
- Frequency:
- 200kHz ~ 2MHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX16814ATP+ FAQ
1.How can I place an order for MAX16814ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16814ATP+ 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 MAX16814ATP+ reliable?
The price and inventory of MAX16814ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16814ATP+ is usually 5 days.
3.What payment methods are accepted for MAX16814ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16814ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16814ATP+?
MAX16814ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16814ATP+ 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 MAX16814ATP+?
For technical support, including MAX16814ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16814ATP+ requirements.
6.How does Aetrix verify that MAX16814ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX16814ATP+ 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 MAX16814ATP+ meets industry standards.
7.What is the process for return or replacement of MAX16814ATP+?
All MAX16814ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16814ATP+, 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 MAX16814ATP+ part is unused and in its original packaging.
Return procedure for MAX16814ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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