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Analog Devices Inc./Maxim Integrated MAX16904SAUE33+
- Part No.:
- MAX16904SAUE33+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16904SAUE33+.pdf
- Description:
- IC REG BUCK 3.3V 600MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,016
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Product details
Overview
The MAX16904SAUE33+ from Maxim Integrated is a synchronous buck DC-DC converter delivering 600mA output with 3.3V fixed regulation, +3.5V to +28V input range, 2.1MHz switching frequency, and 25μA no-load quiescent current-designed for automotive power rails requiring high-voltage tolerance and AEC-Q100 compliance.
For engineers reviewing the MAX16904SAUE33+ datasheet, MAX16904SAUE33+ pinout, MAX16904SAUE33+ application, or MAX16904SAUE33+ equivalent, this page provides verified package mapping (16-pin TSSOP-EP), confirmed spread-spectrum EMI reduction, thermal shutdown at 175°C, PGOOD monitoring, and SYNC-controlled operation modes-critical for automotive infotainment, ADAS camera modules, and industrial control power supplies.
Technical Context
This device implements current-mode control with integrated high-side and low-side DMOS switches (RDS(ON) = 400–800mΩ / 250–450mΩ), operates in dropout at 97% duty cycle, and features internal soft-start (8ms typ) and undervoltage lockout (3.0V typ with 0.4V hysteresis).
It supports three SYNC-configurable modes: SKIP mode (25μA IQ), forced fixed-frequency PWM, and external clock synchronization (1.8–2.6MHz); spread-spectrum modulation (+6% frequency deviation) is enabled on this variant to reduce radiated EMI without compromising AM-band immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% (fixed-frequency mode), ±4.0% (SKIP mode)-ensures stable logic rail for microcontrollers and sensors. |
| Input Voltage Range | +3.5V to +28V continuous; withstands +42V transients ≤1s-meets automotive cold-crank and load-dump requirements. |
| Switching Frequency | 2.1MHz typical (1.925–2.275MHz); enables compact 3.3μH inductor and low-ESR ceramic capacitors. |
| Quiescent Current | 25μA typical in SKIP mode at no load-extends battery life in always-on vehicle systems. |
| Thermal Protection | Thermal shutdown at +175°C with 15°C hysteresis-prevents permanent damage during overload or poor heatsinking. |
| PGOOD Threshold | Active-high open-drain output asserting when VOUT ≥93% of nominal (3.07V), deasserting at ≤91% (3.00V)-enables reliable system power sequencing. |
| Peak Current Limit | 1.05A typical-provides robust short-circuit protection while supporting 600mA continuous output. |
Pinout & Package
MAX16904SAUE33+ uses a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, exposed pad), rated for -40°C to +125°C operation and qualified to AEC-Q100 Grade 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor node | Drives high-side FET gate; requires 0.1μF ceramic capacitor between BST and LX for proper gate charge replenishment. |
| SUP (Pins 2,3) | Main power input | Accepts +3.5V to +28V; both pins must be connected together and decoupled with 4.7μF ceramic capacitor near the package. |
| LX (Pins 4,5) | Switching node | Connects to inductor; both pins must be tied together; high dv/dt node requiring tight layout to minimize EMI. |
| PGND (Pins 6,7) | Power ground return | High-current return path for LX and input/output capacitors; must be connected to EP and isolated from analog GND. |
| OUTS | Voltage feedback sense | Monitors regulated output via resistor divider or direct connection; bypassed with ≥10μF X7R ceramic to PGND. |
| PGOOD | Power-good status | Open-drain output pulled high externally (e.g., 20kΩ to BIAS); asserts after soft-start and VOUT stabilization. |
| SYNC | Mode control input | GND/unconnected → SKIP mode; BIAS/high → forced PWM; external clock → synchronized operation (1.8–2.6MHz). |
| BIAS | Internal LDO output | +5V supply for internal logic; bypassed with 2.2μF ceramic to GND; usable as PGOOD pullup source. |
| GND | Analog reference ground | Low-noise reference for error amplifier and bandgap; connected to PGND only at output capacitor return point. |
| EN | Enable control | High-voltage compatible (3.3V–42V logic); VIH = 2.4V min; no internal pullup-requires external drive for startup sequencing. |
| N.C. (Pins 9,10,16) | No connection | Not internally bonded; must remain unconnected and unpopulated on PCB. |
| EP | Exposed thermal pad | Must be soldered to PGND plane with multiple vias; primary thermal path-accounts for >70% of heat dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | +6% frequency deviation reduces peak EMI emissions by up to 10dB without affecting AM-band compliance. |
| Dropout operation | Maintains regulation at 97% duty cycle-enables stable 3.3V output even during automotive cold-crank (≤4.5V input). |
| Three SYNC-programmable modes | Enables dynamic trade-off between light-load efficiency (SKIP), EMI control (synchronized), and transient response (forced PWM). |
| AEC-Q100 qualification | Validated for automotive Grade 0 (-40°C to +125°C junction), including HTOL, temperature cycling, and ESD (±2kV HBM). |
| Integrated current-limit protection | 1.05A peak threshold with automatic soft-start retry-eliminates need for external overcurrent circuitry in space-constrained designs. |
Applications
| Automotive Infotainment Power | ADAS Camera Module Supply |
|---|---|
Use Scenario: Powers SoC, display interface, and audio codec in head-unit systems subject to wide battery voltage swings and EMI-sensitive RF environments. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator with PGOOD sequencing and spread-spectrum EMI suppression. Use Value: Enables single-stage conversion from 12V battery to clean 3.3V rail-reducing BOM count and meeting CISPR-25 Class 5 radiated emissions limits. | Use Scenario: Supplies image sensor and ISP in rear-view or surround-view cameras operating under engine start-stop and vibration conditions. IC Role / Device Role / Timing Role: High-reliability 3.3V power source with thermal shutdown and cold-crank support down to 4.5V input. Use Value: Maintains uninterrupted video stream during cranking events-no frame loss or reset due to dropout or brownout. |
| Industrial Control I/O Module | Rail-to-Rail Sensor Signal Conditioning |
Use Scenario: Powers microcontroller, CAN transceiver, and isolated ADC in programmable logic controller (PLC) field I/O modules with 24V DC input. IC Role / Device Role / Timing Role: Main 3.3V supply with enable control via PLC backplane logic and PGOOD feedback to host processor. Use Value: Withstands 42V transients from inductive load switching-eliminating need for upstream TVS clamping in cost-sensitive designs. | Use Scenario: Provides precision 3.3V reference and bias for rail-to-rail op-amps and SAR ADCs in environmental monitoring nodes. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 3.3V source with <±2.5% accuracy across temperature and load-supporting 12-bit+ measurement fidelity. Use Value: Delivers stable reference despite varying input from solar-charged batteries-enabling accurate long-term sensor calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMQ66430QRNXTQ1 | 3.0V to 36V input, 3A output, 2.1MHz, no spread-spectrum, QFN-16 package | Higher current capability but larger solution size; lacks integrated EMI reduction features | Select when >600mA load or higher thermal margin required; verify layout compatibility with different pinout and thermal pad. |
| TPS62933EVM-072 | 3.8V to 36V input, 3A output, 2.2MHz, spread-spectrum enabled, WQFN-16 package | Higher voltage rating and current, but not AEC-Q100 qualified; different enable threshold (1.2V vs. 2.4V) | Consider for non-automotive industrial use where AEC-Q100 is not mandated and 3A headroom is needed. |
Compared with LM66430QRNXTQ1 and TPS62933EVM-072, the MAX16904SAUE33+ offers tighter 3.3V regulation accuracy (±2.5%), guaranteed AEC-Q100 qualification, and factory-enabled spread-spectrum-making it optimal for space-constrained automotive modules where EMI and reliability are prioritized over raw current headroom.
Availability
MAX16904SAUE33+ is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and industrial control I/O requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for MAX16904SAUE33+ 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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets-with emphasis on power efficiency, reliability, and integration.
The MAX16904 product line delivers compact, high-voltage synchronous buck converters optimized for automotive subsystems requiring AEC-Q100 compliance, wide input range, and low EMI-targeting infotainment, telematics, and ADAS power rails.
FAQ
What is the output voltage and tolerance of the MAX16904SAUE33+?
The MAX16904SAUE33+ provides a factory-trimmed fixed 3.3V output with ±2.5% accuracy in forced fixed-frequency mode and ±4.0% in SKIP mode across -40°C to +125°C ambient temperature and 0–600mA load. This specification is validated per the Electrical Characteristics table in the official datasheet and applies directly to the MAX16904SAUE33+ variant with spread-spectrum enabled.
Does the MAX16904SAUE33+ support synchronization to an external clock?
Yes, the MAX16904SAUE33+ supports external clock synchronization via its SYNC pin, accepting input frequencies from 1.8MHz to 2.6MHz. When driven by an external clock source, the device enters forced PWM mode with precise frequency alignment-enabling multi-rail EMI reduction and deterministic timing in complex automotive power systems containing the MAX16904SAUE33+.
What package type and thermal characteristics does the MAX16904SAUE33+ use?
The MAX16904SAUE33+ uses a 16-pin TSSOP-EP package (5mm × 4.4mm) with exposed thermal pad. Its thermal resistance is θJA = 38.3°C/W and θJC = 3°C/W on a four-layer board. The exposed pad must be soldered to a PGND copper plane with multiple vias to achieve rated power dissipation and maintain junction temperature below 175°C under 600mA load-verified for the MAX16904SAUE33+ in production test data.
How does the PGOOD function operate on the MAX16904SAUE33+?
The PGOOD pin on the MAX16904SAUE33+ is an open-drain output that pulls low when the regulated 3.3V output falls below 91% (3.00V) and goes high-impedance when above 93% (3.07V). It requires an external pullup (e.g., 20kΩ to BIAS) and debounces for 10μs. This behavior is identical across all MAX16904 variants and is fully characterized for the MAX16904SAUE33+ in the Electrical Characteristics section.
Is spread-spectrum modulation enabled on the MAX16904SAUE33+?
Yes, spread-spectrum modulation is factory-enabled on the MAX16904SAUE33+, deviating the 2.1MHz switching frequency by +6% to reduce peak radiated EMI emissions. This feature is active only during internally generated switching (i.e., when SYNC is unconnected or grounded) and does not interfere with external synchronization-confirmed in the Ordering Information and Selector Guide for the MAX16904SAUE33+ suffix.
MAX16904SAUE33+ 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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP-EP
MAX16904SAUE33+ FAQ
1.How can I place an order for MAX16904SAUE33+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16904SAUE33+ 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 MAX16904SAUE33+ reliable?
The price and inventory of MAX16904SAUE33+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16904SAUE33+ is usually 5 days.
3.What payment methods are accepted for MAX16904SAUE33+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16904SAUE33+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16904SAUE33+?
MAX16904SAUE33+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16904SAUE33+ 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 MAX16904SAUE33+?
For technical support, including MAX16904SAUE33+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16904SAUE33+ requirements.
6.How does Aetrix verify that MAX16904SAUE33+ is sourced from the original manufacturer or authorized distributors?
All MAX16904SAUE33+ 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 MAX16904SAUE33+ meets industry standards.
7.What is the process for return or replacement of MAX16904SAUE33+?
All MAX16904SAUE33+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16904SAUE33+, 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 MAX16904SAUE33+ part is unused and in its original packaging.
Return procedure for MAX16904SAUE33+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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