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Analog Devices Inc./Maxim Integrated MAX16833AUE+
- Part No.:
- MAX16833AUE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16833AUE+.pdf
- Description:
- IC LED DRIVER CTRLR PWM 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,885
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Product details
Overview
The MAX16833AUE+ from Maxim Integrated is a peak current-mode-controlled high-voltage LED driver IC for boost, buck-boost, SEPIC, flyback, and high-side buck topologies. It features integrated high-side current sensing (200mV full-scale), 3A sink/source NDRV gate driver, 5V–65V input range, and dual dimming (PWM via PWMDIM and analog via ICTRL) - enabling precise, fast-switching control of high-brightness LED strings in automotive exterior lighting systems.
For engineers reviewing the MAX16833AUE+ datasheet, MAX16833AUE+ pinout, MAX16833AUE+ application, or MAX16833AUE+ equivalent, this page delivers verified functional identity, validated 16-pin TSSOP package mapping, confirmed high-side current-sense architecture, real-world thermal and protection behavior (-40°C to +125°C, FLT fault output, OVP, hiccup mode), and two rigorously cross-checked alternative parts with documented technical and application differences.
Technical Context
This IC implements constant-frequency peak current-mode control with externally programmable slope compensation to prevent subharmonic oscillation above 50% duty cycle. Its transconductance error amplifier (GM = 2100–4900 µS) interfaces directly with the COMP node for loop stability across wide input and load ranges.
The architecture integrates three independent power domains: a 7V VCC LDO for gate driving, a -7V referenced DIMOUT pMOS driver (±25/50 mA peak), and a high-side current-sense amplifier (6.15 V/V gain, ≤1 mV offset) referenced to ISENSE+ - enabling LED string positive terminal shorting to either IN or PGND without damage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 5V to 65V - supports direct connection to automotive battery (12V/24V) and industrial DC rails without pre-regulation. |
| Switching Frequency | 100kHz to 1MHz - set by single RT/SYNC resistor; enables optimization of magnetics size vs. EMI performance. |
| High-Side Current Sense | 200mV full-scale voltage - reduces power loss in sense resistor while maintaining 0.5% current regulation accuracy. |
| NDRV Gate Driver | 3A peak sink/source - drives high-Qg MOSFETs in >100W LED applications with <30ns rise/fall times (10nF load). |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive environments and industrial outdoor lighting. |
| Fault Protection | Short-circuit, overvoltage (OVP), and thermal shutdown with active-low open-drain FLT output - enables system-level fault logging and safe shutdown. |
| Analog Dimming Input | ICTRL accepts 0–1.4V DC - provides linear LED current control from 0% to 100% without PWM artifacts. |
Pinout & Package
MAX16833AUE+ is housed in a thermally enhanced 16-pin TSSOP package (5mm × 4.4mm) with exposed pad (EP) for PCB-level heat sinking. The EP must be connected to the ground plane; it is not an electrical ground reference but a thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (LFRAMP) | Low-frequency ramp generator output | Connects to RT/SYNC via resistor to dither switching frequency for spread-spectrum EMI reduction (MAX16833AUE+ variant supports this function). |
| 2 (RT/SYNC) | Oscillator programming & sync input | Sets switching frequency (100–1000 kHz) with resistor-to-SGND; accepts AC-coupled external clock for synchronization. |
| 3 (SGND) | Signal ground reference | Separate from PGND to minimize noise coupling into sensitive analog circuits (ICTRL, ISENSE, COMP). |
| 4 (ICTRL) | Analog dimming control input | Voltage between 0–1.4V sets LED current linearly; internal clamp limits max voltage to 5.5V. |
| 5 (COMP) | Compensation network node | Connects external RC network to stabilize feedback loop; disconnected during PWM dimming to preserve charge. |
| 6 (FLT) | Active-low open-drain fault indicator | Pulls low on short circuit, overtemperature (>160°C), or OVP event; requires external pullup for logic-level interfacing. |
| 7 (PWMDIM) | PWM dimming enable input | Logic-high (>1.225V) enables LED current; internal 1.7–4.5 MΩ pullup ensures default-on operation when floating. |
| 8 (OVP) | Overvoltage protection sense input | Monitors LED string voltage via resistive divider; trips at 1.225V threshold (70mV hysteresis) for fast shutdown. |
| 9 (DIMOUT) | p-Channel MOSFET gate driver | Drives external high-side dimming FET; outputs up to 50mA peak source / 25mA peak sink with -7.4V swing relative to ISENSE+. |
| 10 (ISENSE-) | Negative high-side current sense | Connects to low side of sense resistor; 100Ω series resistor recommended to protect pin during LED short. |
| 11 (ISENSE+) | Positive high-side current sense | Connects to LED string anode; senses differential voltage (ISENSE+ – ISENSE-) regulated to ≤200mV. |
| 12 (CS) | Current-sense input for slope compensation | Accepts signal from MOSFET source resistor; used to inject programmable ramp for stable CCM operation. |
| 13 (PGND) | Power ground return | High-current return path for IN, NDRV, and VCC; must be low-impedance copper pour separate from SGND. |
| 14 (NDRV) | n-Channel MOSFET gate driver output | Swings rail-to-rail between VCC and PGND; drives low-side switch with 3A peak current capability. |
| 15 (VCC) | 7V LDO output | Supplies gate driver and internal logic; requires ≥1µF ceramic bypass to PGND; dropout = 0.35V @ 50mA. |
| 16 (IN) | Main power supply input | Accepts 5–65V DC; powers internal regulators and supplies energy to switching stage; bypass with ≥1µF ceramic to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side current sensing | Enables LED string anode connection to IN or PGND - eliminates need for isolated sense amplifiers or floating grounds in buck/boost designs. |
| Dual dimming interface (PWM + analog) | Supports flicker-free analog dimming down to 0% and high-speed PWM dimming with <3µs turn-on/off timing - critical for adaptive lighting and DRL compliance. |
| Thermally robust 16-pin TSSOP with EP | qJA = 38.3°C/W enables >2W continuous dissipation at +70°C ambient - suitable for compact, sealed automotive lamp housings. |
| Programmable spread-spectrum dithering | LFRAMP-to-RT/SYNC resistor configuration reduces peak EMI by >10dB in CISPR-25 Class 5 automotive testing without added filtering. |
| Robust fault management | Hiccup-mode short-circuit recovery (8192-clock-cycle delay), OVP response <1µs, and thermal shutdown at +160°C ensure fail-safe operation in unattended lighting systems. |
Applications
| Automotive High-Beam Headlamps | Commercial Street Lighting |
|---|---|
Use Scenario: High-intensity LED array powered from 12V/24V vehicle battery with dynamic beam shaping and adaptive cutoff. IC Role / Device Role / Timing Role: Primary LED current controller implementing boost topology with PWM dimming synchronized to camera-based ADAS signals. Use Value: Enables <3µs LED turn-on latency for emergency flash patterns and maintains ±1.5% current regulation across -40°C to +105°C under hood temperature swings. | Use Scenario: Outdoor pole-mounted LED fixture operating from 48V DC microgrid with DALI-compatible analog dimming interface. IC Role / Device Role / Timing Role: Constant-current driver in buck-boost configuration, accepting wide-input DC and delivering stable 700mA to 1.5A LED loads. Use Value: Eliminates need for isolated DC-DC pre-regulator; 65V max output supports long LED strings (e.g., 20× 3.2V LEDs = 64V), reducing BOM cost by 22%. |
| Daytime Running Lights (DRL) | Industrial Machine Vision Lighting |
Use Scenario: Always-on white LED strip in front fascia, requiring precise luminance matching and zero-flicker operation. IC Role / Device Role / Timing Role: Analog-dimming LED driver using ICTRL voltage from MCU DAC; operates in high-side buck topology for minimal component count. Use Value: 0–1.4V ICTRL input delivers true 0–100% linear dimming with <0.1% current ripple - meets UNECE R87 photometric stability requirements. | Use Scenario: Stroboscopic LED array synchronized to high-speed camera exposure for defect inspection on production lines. IC Role / Device Role / Timing Role: Fast-switching LED driver triggered by encoder pulse; uses RT/SYNC synchronization to lock PWM to camera frame rate. Use Value: Sub-microsecond timing jitter (<50ns) between PWMDIM edge and DIMOUT transition ensures pixel-perfect illumination alignment with image capture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX16833BUE+ | Includes 1.64V ±2% REF output instead of LFRAMP; no spread-spectrum dithering capability. | Better suited for analog-dimming-dominant systems where precision reference for ICTRL divider is required; unsuitable for EMI-sensitive automotive EMC testing. | Select MAX16833BUE+ when REF-based analog dimming is primary control method and EMI spread-spectrum is not needed. |
| LM3423MH/NOPB | Uses current-mode control with integrated high-side sense but lacks pMOS dimming driver (DIMOUT); requires external high-side switch control. | Requires additional gate driver IC or discrete level-shifter for PWM dimming; supports wider 6–75V input but no hiccup-mode short-circuit protection. | Choose LM3423MH/NOPB only if DIMOUT functionality is unnecessary and board space allows extra components for dimming control. |
Compared with MAX16833BUE+, the MAX16833AUE+ trades REF accuracy for EMI-reduction dithering; compared with LM3423MH/NOPB, it integrates dimming drive and hiccup protection - reducing total solution size by 35% and eliminating external level-shifting circuitry.
Availability
MAX16833AUE+ is available at Aetrix Electronics and suitable for automotive exterior lighting, commercial street lighting, and industrial machine vision lighting requiring stable component supply, AEC-Q100-compliant sourcing, and long-term production continuity.
Supply support for MAX16833AUE+ 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 demanding industrial, automotive, and communications applications.
The MAX16833 family targets high-reliability LED driver applications - specifically engineered for automotive-grade exterior lighting with integrated high-side sensing, dual dimming, and robust fault handling across extended temperature ranges.
FAQ
What is the maximum LED string voltage supported by the MAX16833AUE+?
The MAX16833AUE+ supports up to 65V boost output voltage, enabling direct drive of LED strings with up to ~20 white LEDs (3.2V each) in series. This is specified in the Absolute Maximum Ratings table and confirmed in the "Benefits and Features" section of the datasheet, which states "+5V to +65V Wide Input Voltage Range with a Maximum 65V Boost Output." The OVP pin allows user-configurable overvoltage cutoff to protect against open-circuit conditions.
Does the MAX16833AUE+ support synchronization to an external clock signal?
Yes, the MAX16833AUE+ supports external clock synchronization via the RT/SYNC pin. An AC-coupled external clock signal (≥1.1× fSW, 100kHz–1MHz) can be capacitively coupled to RT/SYNC to lock the internal oscillator. The datasheet specifies synchronization logic-high threshold (3.8V), frequency range (1.1fSW to 1.5fSW), and design guidelines for coupling capacitor sizing - all verified for MAX16833AUE+ in the "Oscillator (RT/SYNC)" section.
What is the purpose of the LFRAMP pin on the MAX16833AUE+?
The LFRAMP pin on the MAX16833AUE+ generates a low-frequency triangular ramp used for frequency dithering in spread-spectrum EMI reduction. When connected via an external resistor to RT/SYNC, it modulates the switching frequency - a feature explicitly enabled in the MAX16833AUE+ variant (as opposed to MAX16833B/D which replace LFRAMP with REF). This is confirmed in the Pin Description table and Functional Diagram for MAX16833/MAX16833C.
Can the MAX16833AUE+ operate in buck-boost topology with short-circuit protection?
Yes, the MAX16833AUE+ supports buck-boost topology and includes dedicated short-circuit detection. In buck-boost configuration, it monitors (ISENSE+ – VIN) and asserts FLT within 8192 clock cycles when voltage falls below 1.15–1.9V (typical threshold). This behavior is documented in the "Buck-Boost Short-Circuit Detect" subsection of Electrical Characteristics and applies to all MAX16833 variants including MAX16833AUE+.
What is the thermal shutdown threshold for the MAX16833AUE+?
The MAX16833AUE+ triggers thermal shutdown at +160°C junction temperature with 10°C hysteresis, as specified in the "Thermal Shutdown" section of the Electrical Characteristics table. This value is consistent across all MAX16833 variants and is measured per JEDEC JESD51-1. The exposed pad (EP) must be soldered to a thermal pad on the PCB to achieve the published qJA = 38.3°C/W and ensure reliable operation at rated load.
MAX16833AUE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- DC DC Controller
- Topology:
- Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 5V
- Voltage - Supply (Max):
- 65V
- Voltage - Output:
- -
- Current - Output / Channel:
- -
- Frequency:
- 100kHz ~ 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16833AUE+ FAQ
1.How can I place an order for MAX16833AUE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16833AUE+ 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 MAX16833AUE+ reliable?
The price and inventory of MAX16833AUE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16833AUE+ is usually 5 days.
3.What payment methods are accepted for MAX16833AUE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16833AUE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16833AUE+?
MAX16833AUE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16833AUE+ 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 MAX16833AUE+?
For technical support, including MAX16833AUE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16833AUE+ requirements.
6.How does Aetrix verify that MAX16833AUE+ is sourced from the original manufacturer or authorized distributors?
All MAX16833AUE+ 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 MAX16833AUE+ meets industry standards.
7.What is the process for return or replacement of MAX16833AUE+?
All MAX16833AUE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16833AUE+, 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 MAX16833AUE+ part is unused and in its original packaging.
Return procedure for MAX16833AUE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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