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Analog Devices Inc./Maxim Integrated MAX16904RAUE33/V+
- Part No.:
- MAX16904RAUE33/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
MAX16904RAUE33/V+.pdf
- Description:
- IC REG BUCK 3.3V 600MA 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:107
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Product details
Overview
The MAX16904RAUE33/V+ from Maxim Integrated is a synchronous buck DC-DC converter delivering 600mA output at fixed 3.3V with input voltage range +3.5V to +28V, 2.1MHz switching frequency, 25μA no-load quiescent current, and AEC-Q100 qualification for automotive power rails.
For engineers reviewing the MAX16904RAUE33/V+ datasheet, MAX16904RAUE33/V+ pinout, MAX16904RAUE33/V+ application, or MAX16904RAUE33/V+ equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and EMI performance, and real-world design constraints for high-voltage input DC-DC conversion in engine control units and ADAS modules.
Technical Context
The MAX16904RAUE33/V+ implements current-mode control with integrated high-side (400–800mΩ RDS(ON)) and low-side (250–450mΩ RDS(ON)) DMOS switches, enabling dropout operation at 97% duty cycle. Its 80ns minimum on-time supports stable regulation down to 3.3V output even at 18V input.
Three SYNC-configurable modes-SKIP (25μA IQ), forced fixed-frequency (2.1MHz ±6.5%), and external synchronization (1.8–2.6MHz)-allow dynamic trade-offs between light-load efficiency and EMI control. Spread-spectrum modulation is disabled per /V+ suffix and ordering code RAUE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±2.5% (fixed-frequency mode), ±4.0% (SKIP mode) - ensures compatibility with 3.3V logic and microcontroller I/O rails |
| Input Voltage Range | +3.5V to +28V, tolerates +42V transients ≤1s - supports cold-crank (6V) and load-dump (40V) conditions in 12V/24V automotive systems |
| Max Output Current | 600mA continuous, 1.05A peak current limit - sufficient for powering CAN transceivers, sensors, and MCU cores in body electronics |
| Switching Frequency | 2.1MHz typical (1.925–2.275MHz), externally synchronizable 1.8–2.6MHz - enables <5mm² total passive area and avoids AM band interference |
| Quiescent Current | 25μA typical in SKIP mode at no load - extends battery life during vehicle sleep modes without compromising wake-up response |
| Operating Temperature | -40°C to +125°C junction - qualified per AEC-Q100 Grade 1 for under-hood and transmission-control applications |
| Package | 16-pin TSSOP-EP (5mm × 4.4mm), exposed pad soldered to PGND - achieves θJA = 38.3°C/W for sustained 600mA operation at +85°C ambient |
Pinout & Package
MAX16904RAUE33/V+ uses a thermally enhanced 16-pin TSSOP-EP package (U16E+3 outline) with exposed pad connected to PGND. The package supports 2089mW power dissipation at +70°C ambient, derating 26.1mW/°C above that point.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SUP (Pins 2, 3) | High-voltage input supply rail | Accepts +3.5V to +28V; requires local 4.7µF ceramic capacitor; withstands +42V transients ≤1s |
| LX (Pins 4, 5) | Switching node connecting internal HS/LS FETs to external inductor | Drives 3.3µH inductor in typical 3.3V application; must be routed short and wide to minimize ringing |
| PGND (Pins 6, 7) | Power ground return for high-current paths | Must be tied directly to exposed pad and output capacitor negative terminal; separate from analog GND |
| OUTS (Pin 8) | Voltage feedback sense input | Monitors regulated 3.3V output via resistor divider or direct connection; bypassed with ≥10µF X7R ceramic |
| PGOOD (Pin 11) | Open-drain power-good status signal | Pulls low when VOUT drops below 91% of nominal; requires external 20kΩ pullup to BIAS or 3.3V rail |
| SYNC (Pin 12) | Mode selection and clock synchronization input | GND/unconnected → SKIP mode; BIAS or external clock → forced PWM; no internal pullup/pulldown |
| BIAS (Pin 13) | Internal +5V logic supply output | Provides bias for internal circuitry; requires 2.2µF ceramic capacitor to GND; usable as PGOOD pullup source |
| GND (Pin 14) | Analog ground reference | Connects only to clean analog ground plane; joined to PGND at single point near output capacitor |
| EN (Pin 15) | Enable control input | High-voltage compatible (3.3V–42V logic); VIH = 2.4V min; drives device into shutdown drawing ≤8µA |
| BST (Pin 16) | Bootstrap capacitor connection for high-side gate driver | Requires 0.1µF ceramic capacitor between BST and LX; critical for maintaining >97% duty cycle in dropout |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 25μA in SKIP mode enables >10-year battery standby in always-on automotive modules |
| Integrated high- and low-side FETs | Eliminates need for external MOSFETs and gate drivers; reduces BOM count and layout complexity |
| Power-good monitoring | PGOOD open-drain output with 10μs debounce enables safe system power sequencing and fault detection |
| Thermal shutdown protection | 175°C trip point with 15°C hysteresis prevents permanent damage during overload or poor heatsinking |
| AEC-Q100 qualification | Validated for automotive Grade 1 (-40°C to +125°C) operation including HTOL, TC, and ESD testing |
Applications
| Engine Control Unit (ECU) Power Rail | Advanced Driver Assistance Systems (ADAS) Camera Module |
|---|---|
|
Use Scenario: Powers 3.3V microcontroller, CAN interface, and sensor signal conditioning circuitry in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator supplying core logic and communication peripherals. Use Value: Survives cold-crank (6V) and load-dump (40V) events while maintaining regulation, ensuring uninterrupted ECU operation during cranking and alternator faults. |
Use Scenario: Supplies 3.3V to image sensor, ISP, and MIPI serializer in forward-facing ADAS cameras mounted behind windshield. IC Role / Device Role / Timing Role: Point-of-load regulator converting 12V battery to stable 3.3V for high-speed imaging subsystems. Use Value: 2.1MHz switching minimizes EMI coupling into analog video signals; PGOOD enables camera boot validation before image capture. |
| Automotive Body Control Module (BCM) | Infotainment System Power Management |
|
Use Scenario: Provides 3.3V rail to door module MCUs, LIN transceivers, and LED drivers in centralized body electronics architecture. IC Role / Device Role / Timing Role: Secondary buck converter supporting low-power wake-up functionality and interior lighting control. Use Value: 25μA quiescent current meets OEM requirements for <100μA total BCM sleep current, extending battery life during extended parking. |
Use Scenario: Generates 3.3V for audio DSP, touch controller, and display interface ICs in head-unit infotainment systems. IC Role / Device Role / Timing Role: Dedicated power stage for noise-sensitive digital audio processing blocks. Use Value: Synchronous rectification and 2.1MHz operation reduce output ripple to <15mVPP, preventing audible noise in Class-D amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQR | 3.3V fixed output, 1.5MHz switching, 1.2A rating, 16-pin WQFN (3mm × 3mm) | Higher current capability but larger minimum on-time (100ns) limits dropout performance at 3.3V/18V input | Select when >600mA load margin or smaller footprint is required; verify cold-crank behavior with 100ns tON(min) |
| TPS62933RTER | 3.3V fixed output, 2.5MHz switching, 3A rating, 16-pin VQFN (3mm × 3mm), integrated compensation | Higher switching frequency enables smaller inductors but lacks AEC-Q100 qualification and +42V transient tolerance | Select for non-automotive industrial applications requiring higher current or tighter output regulation; not suitable for under-hood use |
Compared with LM61480RQR and TPS62933RTER, the MAX16904RAUE33/V+ uniquely combines AEC-Q100 qualification, +42V transient tolerance, 80ns minimum on-time for deep dropout, and 25μA SKIP-mode quiescent current - making it the only option qualified for direct replacement in safety-critical automotive power rails.
Availability
MAX16904RAUE33/V+ is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, body control modules, and infotainment systems requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for MAX16904RAUE33/V+ 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 MAX16904 product line delivers compact, high-voltage synchronous buck converters optimized for automotive power rails where AEC-Q100 compliance, cold-crank robustness, and ultra-low quiescent current are mandatory.
FAQ
What is the exact output voltage tolerance of the MAX16904RAUE33/V+ in fixed-frequency mode?
The MAX16904RAUE33/V+ delivers 3.3V output with ±2.5% tolerance under fixed-frequency operation across -40°C to +125°C, 6V–18V input, and 0–600mA load. This specification ensures reliable operation with 3.3V I/O standards such as SPI, I²C, and UART interfaces in automotive ECUs. The MAX16904RAUE33/V+ does not require external feedback resistors due to factory-trimmed internal reference.
Does the MAX16904RAUE33/V+ support spread-spectrum modulation?
No, the MAX16904RAUE33/V+ does not include spread-spectrum modulation. Its ordering code "RAUE" indicates the spread-spectrum option is disabled; only "SAUE" variants (e.g., MAX16904SAUE33/V+) enable ±6% frequency dithering. The MAX16904RAUE33/V+ relies on 2.1MHz fixed-frequency operation and careful PCB layout to meet CISPR 25 Class 5 radiated emissions limits.
What is the maximum continuous output current the MAX16904RAUE33/V+ can deliver in a 16-pin TSSOP-EP package at +85°C ambient?
The MAX16904RAUE33/V+ sustains 600mA continuous output current at +85°C ambient when mounted on a standard four-layer PCB with the exposed pad fully soldered to a 2cm² PGND copper area. Thermal calculations using θJA = 38.3°C/W confirm junction temperature remains below 150°C under these conditions, well within the +175°C thermal shutdown threshold.
How does the PGOOD function behave during startup and fault conditions for the MAX16904RAUE33/V+?
The MAX16904RAUE33/V+ asserts PGOOD high only after output voltage reaches 93% of 3.3V and remains stable for ≥10μs; it pulls low if VOUT falls below 91%. During soft-start, PGOOD stays low until regulation is achieved. Under overcurrent or thermal fault, PGOOD goes low within 10μs and remains low until the fault clears and soft-start completes. This behavior enables deterministic power sequencing in automotive domain controllers.
Can the MAX16904RAUE33/V+ operate with a 6V input during engine cranking?
Yes, the MAX16904RAUE33/V+ operates continuously at 6V input during cold-crank events. Its UVLO threshold is 2.8V (rising) with 0.4V hysteresis, and it maintains regulation down to 3.5V input. At 6V input, the device runs at ~55% duty cycle in fixed-frequency mode, delivering full 600mA to the 3.3V rail without dropout or PGOOD assertion loss - verified per AEC-Q100 pulse test profiles.
MAX16904RAUE33/V+ 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
MAX16904RAUE33/V+ FAQ
1.How can I place an order for MAX16904RAUE33/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16904RAUE33/V+ 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 MAX16904RAUE33/V+ reliable?
The price and inventory of MAX16904RAUE33/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16904RAUE33/V+ is usually 5 days.
3.What payment methods are accepted for MAX16904RAUE33/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16904RAUE33/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16904RAUE33/V+?
MAX16904RAUE33/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16904RAUE33/V+ 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 MAX16904RAUE33/V+?
For technical support, including MAX16904RAUE33/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16904RAUE33/V+ requirements.
6.How does Aetrix verify that MAX16904RAUE33/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16904RAUE33/V+ 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 MAX16904RAUE33/V+ meets industry standards.
7.What is the process for return or replacement of MAX16904RAUE33/V+?
All MAX16904RAUE33/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16904RAUE33/V+, 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 MAX16904RAUE33/V+ part is unused and in its original packaging.
Return procedure for MAX16904RAUE33/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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