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Analog Devices Inc./Maxim Integrated MAX16814BEUP+T
- Part No.:
- MAX16814BEUP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16814BEUP+T.pdf
- Description:
- IC LED DRVR CTRLR PWM 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,768
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Product details
Overview
MAX16814BEUP+T from Maxim Integrated is a 4-channel high-brightness LED driver IC with integrated current-mode DC-DC controller, designed for automotive and general lighting backlight systems. It delivers up to 150mA per channel with ±3% accuracy, operates from 4.75V to 40V input, supports boost/SEPIC/coupled-inductor topologies, and features adaptive output voltage control to minimize power loss in LED current sinks - enabling efficient driving of LCD display backlights in vehicles.
For engineers reviewing the MAX16814BEUP+T datasheet, MAX16814BEUP+T pinout, MAX16814BEUP+T application, or MAX16814BEUP+T equivalent, key selection criteria include its -40°C to +85°C operating range (BE grade), 200kHz–2MHz programmable switching frequency, integrated 5V LDO, open-drain fault flag (FLT), and support for 5000:1 PWM dimming with sub-microsecond pulse capability.
Technical Context
The MAX16814BEUP+T integrates a peak current-mode DC-DC controller with programmable slope compensation and a quad linear current-sink array. Its error amplifier regulates the minimum OUT_ voltage to 1V, establishing converter output as highest LED string voltage plus 1V - enabling adaptive voltage control that reduces dissipation across current sinks.
It implements open-LED detection via minimum-string-voltage monitoring, shorted-LED detection using RSDT-adjustable threshold (1.75–2.25V), and overvoltage protection triggered at 1.228V on OVP pin. The BE variant is specified for -40°C to +85°C operation and exhibits ±4% LED current accuracy across that full range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.75V to 40V - withstands automotive load-dump events without external protection. |
| LED Channel Current | 20mA to 150mA per channel, set by single RSETI resistor with ±3% accuracy at +25°C and ±4% over -40°C to +85°C. |
| Switching Frequency | 200kHz to 2MHz, adjustable via RT resistor - enables optimization of magnetic size vs. efficiency and EMI performance. |
| PWM Dimming Ratio | 5000:1 at 200Hz - supports high-contrast dimming with 1µs minimum pulse width (A/U variants); BE variant supports standard PWM dimming. |
| Operating Temperature | -40°C to +85°C - qualified for automotive cabin and industrial ambient lighting environments. |
| Fault Protection | Open-LED, shorted-LED (programmable threshold), overtemperature (165°C shutdown), and output overvoltage detection. |
| Package | 20-pin TSSOP (6.5mm × 4.4mm) - thermally enhanced with exposed pad for PCB heat sinking. |
Pinout & Package
MAX16814BEUP+T is housed in a 20-pin TSSOP package (6.5mm × 4.4mm) with exposed thermal pad (EP). Pin 1 is IN; pin 20 is VCC; EP must be connected to SGND for thermal management but not used as primary ground return.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Bias supply input | Accepts 4.75V–40V input; internal UVLO triggers at 4.3V rising edge - ensures robust startup under cold-crank conditions. |
| EN (Pin 2) | Enable logic input | Shuts down entire device when pulled below 1.144V; hysteresis prevents chatter near 1.23V threshold. |
| OUT1–OUT4 (Pins 11–12, 14–15) | LED string cathode sinks | Four independent open-drain current sinks; each handles up to 150mA with ±1.5% channel-to-channel matching at 100mA. |
| SETI (Pin 7) | Current programming input | Resistor from SETI to SGND sets all four channels identically: ILED = 1500/RSETI (in kΩ) → mA. |
| FLT (Pin 5) | Open-drain fault indicator | Asserts low on open-LED, shorted-LED, or thermal shutdown - requires external 10kΩ pull-up to VCC for logic-level signaling. |
| OVP (Pin 6) | Overvoltage protection threshold adjust | Resistive divider from DC-DC output to OVP sets clamping point; internal reference is 1.228V - protects against LED string open-circuit overvoltage. |
| RSDT (Pin 8) | Shorted-LED detection threshold adjust | Resistive divider from VCC to RSDT programs short-detection level (1.75–2.25V); direct connection to VCC disables detection. |
| RT (Pin 4) | Oscillator timing input | Resistor to SGND sets fSW: RT = 7.72×10⁹/fSW (Hz) for BE variant - enables precise frequency tuning and external synchronization. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive output voltage control | Maintains DC-DC output at (max LED string VF + 1V), minimizing voltage drop and power loss across linear current sinks. |
| Integrated 5V LDO regulator | Supplies up to 50mA at 5.0V ±2.5% (1mA–10mA load), powers external circuitry without secondary regulator. |
| Programmable LED short detection | Adjustable threshold (1.75–2.25V) via RSDT pin - enables reliable detection of partial or full LED string shorts. |
| Leading-edge blanking on CS | 60ns blanking window suppresses MOSFET switching noise at current-sense node - improves stability and noise immunity. |
| Thermal shutdown with hysteresis | Shuts down at 165°C junction temperature; restarts at 150°C - prevents thermal runaway while avoiding cycling near trip point. |
Applications
| Automotive Display Backlight | Automotive Front Lighting |
|---|---|
|
Use Scenario: Driving 4 parallel strings of white LEDs behind TFT-LCD instrument clusters or center-stack displays in passenger vehicles. IC Role / Device Role / Timing Role: Provides regulated constant-current drive and adaptive DC-DC bias voltage; synchronizes dimming via DIM input with vehicle CAN bus-controlled brightness profiles. Use Value: Enables uniform brightness across wide temperature (-40°C to +85°C) and input voltage (9V–16V nominal, up to 40V load dump) ranges without external compensation. |
Use Scenario: Powering DRL (Daytime Running Light) modules with multiple LED strings requiring independent current control and fault reporting. IC Role / Device Role / Timing Role: Acts as primary LED driver with integrated open/short detection and FLT fault flag - interfaces directly with vehicle body control module (BCM) for diagnostics. Use Value: Reduces BOM count by integrating DC-DC controller, 4-channel sinks, protection logic, and LDO - eliminates need for discrete current mirrors or external supervisors. |
| LCD TV Backlight | Industrial Ambient Lighting |
|
Use Scenario: Backlighting medium-size (24″–32″) LCD panels in commercial signage or medical displays where EMI and thermal performance are critical. IC Role / Device Role / Timing Role: Delivers high-accuracy current regulation and 5000:1 PWM dimming - supports flicker-free video playback and smooth brightness transitions. Use Value: Programmable 200kHz–2MHz switching frequency allows trade-off between inductor size and efficiency; TSSOP package supports compact, convection-cooled layouts. |
Use Scenario: Driving multi-string LED arrays in factory floor lighting or warehouse high-bay fixtures with long operational life requirements. IC Role / Device Role / Timing Role: Serves as robust, thermally managed LED driver with overtemperature protection and fault-flag reporting for predictive maintenance systems. Use Value: 40V absolute max input rating and -40°C to +85°C operation ensure reliability in unregulated AC/DC supplies and harsh ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16814AEUP+T | Rated for -40°C to +125°C; ±3% current accuracy over full range; supports 1µs min PWM pulse width. | Suitable for under-hood automotive applications (e.g., headlamp modules) requiring extended temperature qualification. | Select MAX16814AEUP+T when full AEC-Q100 Grade 0 compliance or operation above +85°C is required. |
| LM3409QMY/NOPB | Single-channel buck-boost LED controller; no integrated current sinks; requires external FET and sense resistors. | Used in high-power single-string designs (e.g., fog lights); lacks multi-string coordination and built-in fault flags. | Choose LM3409QMY/NOPB for cost-sensitive, lower-channel-count designs where layout flexibility and external component selection outweigh integration benefits. |
Compared with MAX16814AEUP+T, the MAX16814BEUP+T trades extended temperature range and ultra-narrow PWM capability for lower cost and sufficient performance in cabin-display applications; versus LM3409QMY/NOPB, it delivers higher integration, faster time-to-market, and simplified fault handling at the expense of topology flexibility.
Availability
MAX16814BEUP+T is available at Aetrix Electronics and suitable for automotive display backlighting, industrial ambient lighting, and LCD TV backlighting requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX16814BEUP+T 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 markets.
The MAX16814 product line delivers highly integrated LED drivers with adaptive DC-DC control and comprehensive fault protection - engineered specifically for reliable, high-efficiency backlighting in automotive and commercial display systems.
FAQ
What is the operating temperature range for the MAX16814BEUP+T?
The MAX16814BEUP+T is rated for operation from -40°C to +85°C. This specification covers all electrical parameters including LED current accuracy (±4%), switching frequency stability, and fault-protection thresholds. It is intended for automotive cabin and industrial indoor applications - not under-hood or exterior lighting where higher junction temperatures occur. The BE grade does not support the +125°C maximum of the A-grade variant.
How is LED current set on the MAX16814BEUP+T?
LED current on the MAX16814BEUP+T is set by a single external resistor (RSETI) connected from the SETI pin (Pin 7) to SGND. The relationship is ILED = 1500 / RSETI, where RSETI is in kΩ and ILED is in mA. For example, a 15kΩ resistor sets 100mA per channel. All four channels track this value with ±1.5% matching when all are active, and the setting remains stable across the -40°C to +85°C range.
Does the MAX16814BEUP+T support PWM dimming, and what is its minimum pulse width?
Yes, the MAX16814BEUP+T supports logic-level PWM dimming via the DIM pin (Pin 10). While the MAX16814AEUP+T and MAX16814UEUP+T support 1µs minimum pulse width, the BE variant implements standard PWM dimming without the ultra-short-pulse enhancement. Its DIM input accepts 0.8V low / 2.1V high logic levels and provides typical 100ns turn-on/turn-off delays - sufficient for 200Hz–10kHz dimming in display backlight applications.
What protection features does the MAX16814BEUP+T include?
The MAX16814BEUP+T includes open-LED detection (via minimum-string-voltage monitoring), programmable shorted-LED detection (adjustable 1.75–2.25V threshold via RSDT), output overvoltage protection (clamps at 1.228V × OVP divider ratio), and overtemperature shutdown (165°C with 15°C hysteresis). All faults assert the open-drain FLT pin low, providing a single-wire diagnostic interface to host controllers.
Can the MAX16814BEUP+T drive more than 150mA per LED string?
No - each OUTx pin (OUT1–OUT4) is rated for a maximum continuous sink current of 150mA. However, the MAX16814BEUP+T allows paralleling multiple channels (e.g., connecting OUT1 and OUT2 together) to achieve higher total current per string, provided PCB layout and thermal design accommodate the increased power dissipation. Channel-to-channel matching remains within ±1.5% at 100mA, supporting balanced current sharing.
MAX16814BEUP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX16814BEUP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16814BEUP+T 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+T reliable?
The price and inventory of MAX16814BEUP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16814BEUP+T is usually 5 days.
3.What payment methods are accepted for MAX16814BEUP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16814BEUP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16814BEUP+T?
MAX16814BEUP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16814BEUP+T 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+T?
For technical support, including MAX16814BEUP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16814BEUP+T requirements.
6.How does Aetrix verify that MAX16814BEUP+T is sourced from the original manufacturer or authorized distributors?
All MAX16814BEUP+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX16814BEUP+T?
All MAX16814BEUP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX16814BEUP+T, 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+T part is unused and in its original packaging.
Return procedure for MAX16814BEUP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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