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Analog Devices Inc./Maxim Integrated MAX16814BEUP+
- Part No.:
- MAX16814BEUP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16814BEUP+.pdf
- Description:
- IC LED DRVR CTRLR PWM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,873
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Product details
Overview
The MAX16814BEUP+ 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. It delivers ±3% accurate 20–150mA per channel, withstands 40V automotive load-dump events, and operates from -40°C to +85°C in a 20-pin TSSOP package-designed for automotive RCL/DRL and LCD display backlighting.
For engineers reviewing the MAX16814BEUP+ datasheet, MAX16814BEUP+ pinout, MAX16814BEUP+ application, or MAX16814BEUP+ equivalent, key selection criteria include its adaptive output-voltage control minimizing LED sink dissipation, programmable shorted-LED detection via RSDT, 5000:1 PWM dimming at 200Hz, and fault-flag reporting via open-drain FLT output.
Technical Context
The MAX16814BEUP+ integrates a peak-current-mode DC-DC controller with programmable slope compensation (45–55μA×fSW) and a four-channel linear current-sink array. Its error amplifier regulates minimum OUTx voltage to 1V, enabling adaptive converter output voltage tracking of the highest LED string forward voltage plus 1V headroom.
It features dual UVLO (IN: 4.3V rising / 4.15V falling; VCC: 4.0V rising), thermal shutdown at 165°C with 15°C hysteresis, and open-drain FLT assertion on open-LED, shorted-LED, or overtemperature faults-each with dedicated detection thresholds and response delays confirmed in electrical characteristics tables.
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 Channel Current | 20mA to 150mA ±3% accuracy - set globally by single RSETI resistor; enables matched brightness across 4 strings. |
| Switching Frequency | 200kHz to 2MHz - adjustable via RT resistor; allows optimization of magnetics size vs. EMI performance. |
| PWM Dimming Ratio | 5000:1 at 200Hz - supports ultra-fine brightness control down to 1µs pulse width in A/U variants (BE variant retains full dimming capability). |
| Operating Temperature | -40°C to +85°C - qualified for under-hood automotive lighting and industrial ambient applications. |
| Fault Detection | Open-LED, shorted-LED (programmable threshold), overvoltage (via OVP pin), and overtemperature - all reported via open-drain FLT output. |
| Package | 20-pin TSSOP (6.5mm × 4.4mm) - thermally enhanced with exposed pad; junction-to-ambient θJA = 37.7°C/W. |
Pinout & Package
MAX16814BEUP+ is housed in a 20-pin TSSOP package with exposed thermal pad (EP). Pin 1 is IN; pin 20 is VCC. Signal ground (SGND), power ground (PGND), and LED ground (LEDGND) must be connected at a single point for noise immunity and stable current regulation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Bias supply input | Accepts 4.75–40V DC; bypassed to SGND with ceramic capacitor; withstands automotive load-dump events. |
| EN (Pin 2) | Enable logic input | Logic-high (>1.23V) enables operation; logic-low shuts down device to <40µA standby current. |
| COMP (Pin 3) | DC-DC loop compensation node | Connects external RC network to SGND; sets stability and transient response of current-mode controller. |
| RT (Pin 4) | Oscillator timing input | Resistor to SGND sets switching frequency; also accepts AC-coupled external clock for synchronization. |
| FLT (Pin 5) | Open-drain fault indicator | Asserts low on open-LED, shorted-LED, or overtemperature; requires 10kΩ pull-up to VCC. |
| OVP (Pin 6) | Overvoltage protection threshold adjust | Resistive divider from DC-DC output sets clamping voltage (reference = 1.23V); prevents damage during open-string fault. |
| SETI (Pin 7) | LED current programming input | Resistor to SGND sets all four channels identically: ILED = 1500/RSETI (in mA, R in kΩ). |
| RSDT (Pin 8) | Shorted-LED detection threshold adjust | Resistive divider from VCC sets short-detection voltage (reference = 2.0V); connect directly to VCC to disable. |
| SGND (Pin 9) | Signal ground reference | Return path for analog circuits (COMP, SETI, OVP, RSDT); tie to LEDGND and PGND at single star point. |
| DIM (Pin 10) | PWM dimming control input | Logic-level signal (2.1V high / 0.8V low) controls LED on/off timing; supports 5000:1 dimming ratio. |
| OUT1–OUT4 (Pins 11–12, 14–15) | LED string cathode outputs | Four independent linear current sinks; each sinks up to 150mA; connect unused OUTx to LEDGND. |
| LEDGND (Pin 13) | LED current return path | Ground return for all four current sinks; must be tied to SGND and PGND at single point. |
| CS (Pin 16) | Current-sense input | Monitors external MOSFET source voltage via sense resistor; includes leading-edge blanking and slope compensation injection. |
| PGND (Pin 17) | Power ground return | High-current return for DC-DC switch node and CS sense resistor; tie to SGND and LEDGND at star point. |
| NDRV (Pin 18) | n-MOSFET gate driver output | Drives external high-side n-channel MOSFET; 2A peak sink/source, 0.9Ω/1.1Ω on-resistance. |
| DRV (Pin 19) | MOSFET driver supply input | Connected via resistor to VCC; powers internal gate driver; bypassed to PGND with ≥0.1µF ceramic cap. |
| VCC (Pin 20) | 5V LDO regulator output | Internal 5V supply; ±3% regulation; powers internal circuitry and external logic; bypassed to SGND with ≥1µF ceramic cap. |
| EP (Exposed Pad) | Thermal dissipation path | Must be soldered to large contiguous copper plane; improves thermal resistance but is not primary ground connection. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive output-voltage control | Regulates DC-DC output to minimum OUTx voltage +1V, reducing power loss in current sinks by up to 30% versus fixed-output designs. |
| Programmable shorted-LED detection | Threshold set via RSDT pin (1.75–2.25V range); avoids false triggers while enabling early fault isolation in multi-string arrays. |
| Integrated 5V LDO regulator | Delivers up to 100mA with <500mV dropout at 50mA; powers external logic or sensors without requiring separate regulator. |
| Leading-edge blanking on CS input | 60ns blanking window suppresses MOSFET switching noise, ensuring accurate current sensing even at high dV/dt. |
| Soft-start with OVP-based ramp | Internally timed startup ramps DC-DC output to 95% of OVP threshold before engaging full feedback, preventing inrush current and overshoot. |
Applications
| Automotive RCL & DRL Lighting | Automotive LCD Display Backlight |
|---|---|
Use Scenario: Driving 2–4 parallel strings of white HB LEDs in rear combination lamps or daytime running lights powered from 12V vehicle battery with load-dump transients. IC Role / Device Role / Timing Role: Acts as constant-current sink array and DC-DC voltage generator; provides adaptive output voltage control to maintain efficiency across varying LED Vf and temperature. Use Value: Enables compact, thermally efficient design with integrated fault reporting (FLT) and programmable short detection-reducing BOM count and system-level diagnostics effort. | Use Scenario: Backlighting 7″–10″ automotive infotainment displays where brightness uniformity, dimming resolution, and thermal reliability are critical. IC Role / Device Role / Timing Role: Serves as 4-channel LED driver with synchronized PWM dimming; uses adaptive voltage control to minimize heat generation in confined display bezels. Use Value: Delivers 5000:1 dimming at 200Hz with sub-microsecond pulse support (A/U variants), meeting OEM requirements for glare-free night-time UI transitions. |
| Industrial Ambient Lighting | Architectural LED Signage |
Use Scenario: Powering modular LED panels in factory or warehouse environments with wide input voltage tolerance and robust thermal management. IC Role / Device Role / Timing Role: Functions as universal 4-channel HB LED driver with programmable protection thresholds; operates reliably from -40°C to +85°C ambient. Use Value: Reduces need for external protection circuitry (OVP, OTP, open/short detection) and simplifies compliance with IEC 61000-4-5 surge immunity standards. | Use Scenario: Driving segmented LED arrays in outdoor signage where long-term reliability, fault visibility, and consistent color point are essential. IC Role / Device Role / Timing Role: Provides matched current regulation across 4 independent strings; FLT output feeds into centralized monitoring system for predictive maintenance. Use Value: Enables remote fault identification (open/short/thermal) without visual inspection-cutting maintenance downtime and service costs. |
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 |
|---|---|---|---|
| MAX16820ATL+ | Same 4-channel architecture but supports only 10–120mA per channel; lacks RSDT-programmable short detection; uses 16-pin TQFN. | Targeted at cost-sensitive general lighting; not qualified for automotive temperature range (-40°C to +85°C). | Select when lower current range suffices and short-detection programmability is unnecessary. |
| LM3409QMY/NOPB | Single-channel buck-boost LED controller with external current sink; no integrated multi-channel linear sinks; requires external MOSFET drivers and current-setting resistors per channel. | Suitable for flexible topology designs where channel count and layout are customized per application; lacks integrated fault-flag aggregation. | Select when system-level flexibility outweighs integration benefits and BOM reduction is secondary. |
Compared with MAX16820ATL+, the MAX16814BEUP+ offers wider current range (20–150mA), programmable short detection, and automotive qualification; compared with LM3409QMY/NOPB, it eliminates 3 external current sinks and associated layout complexity while providing unified fault reporting.
Availability
MAX16814BEUP+ is available at Aetrix Electronics and suitable for automotive RCL/DRL systems, LCD display backlighting, industrial ambient lighting, and architectural LED signage requiring stable component supply across extended temperature ranges and high-reliability operation.
Supply support for MAX16814BEUP+ 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) is a semiconductor company specializing in precision analog, mixed-signal, and power management ICs for automotive, industrial, and communications applications.
The MAX16814 product line was designed specifically for high-efficiency, multi-string HB LED lighting in automotive and industrial environments-emphasizing integrated protection, adaptive voltage control, and wide-input ruggedness.
FAQ
What is the maximum LED string voltage supported by the MAX16814BEUP+?
The MAX16814BEUP+ does not fix the maximum LED string voltage-it adapts the DC-DC output to the highest forward voltage among the four strings plus 1V headroom. With OVP threshold programmable up to ~15V (using standard resistor dividers), typical maximum string voltage is ~14V. The actual limit depends on external components and OVP setting, not the IC itself.
Can the MAX16814BEUP+ drive more than 150mA per channel?
No-the MAX16814BEUP+ specifies a maximum continuous current of 150mA per OUTx pin. However, multiple channels can be paralleled (e.g., OUT1 + OUT2) to achieve higher total current per 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.
Does the MAX16814BEUP+ support synchronization to an external clock?
Yes-the MAX16814BEUP+ supports external clock synchronization via the RT pin. An AC-coupled external clock signal applied to RT overrides the internal oscillator and locks the switching frequency to the external source, enabling EMI reduction through frequency dithering or system-level timing alignment.
How does the adaptive output-voltage control in the MAX16814BEUP+ reduce power dissipation?
The MAX16814BEUP+ measures the lowest voltage among its four OUTx pins and regulates the DC-DC output to that value plus 1V. This minimizes the voltage drop across each linear current sink, directly reducing I²R losses. For example, with 3.2V LED strings, output is ~4.2V instead of a fixed 12V-cutting sink dissipation by >60%.
Is the MAX16814BEUP+ pin-compatible with other MAX16814 variants like MAX16814AUP+?
Yes-the MAX16814BEUP+ shares identical pinout, package dimensions, and functional interface with all MAX16814 variants (A/U/BU), differing only in temperature grade (-40°C to +85°C for BE), oscillator accuracy (±7%), and absence of sub-1µs pulse support (a feature exclusive to A/U versions). No PCB changes are required when substituting within the same package type.
MAX16814BEUP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP-EP
MAX16814BEUP+ FAQ
1.How can I place an order for MAX16814BEUP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16814BEUP+ 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 MAX16814BEUP+ reliable?
The price and inventory of MAX16814BEUP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16814BEUP+ is usually 5 days.
3.What payment methods are accepted for MAX16814BEUP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16814BEUP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16814BEUP+?
MAX16814BEUP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16814BEUP+ 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 MAX16814BEUP+?
For technical support, including MAX16814BEUP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16814BEUP+ requirements.
6.How does Aetrix verify that MAX16814BEUP+ is sourced from the original manufacturer or authorized distributors?
All MAX16814BEUP+ 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 MAX16814BEUP+ meets industry standards.
7.What is the process for return or replacement of MAX16814BEUP+?
All MAX16814BEUP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16814BEUP+, 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 MAX16814BEUP+ part is unused and in its original packaging.
Return procedure for MAX16814BEUP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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