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Analog Devices Inc./Maxim Integrated MAX16904SAUE50+
- Part No.:
- MAX16904SAUE50+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX16904SAUE50+.pdf
- Description:
- IC REG BUCK 5V 600MA 16TSSOP
- Quantity:
- Payment:
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Product details
Overview
The MAX16904SAUE50+ from Maxim Integrated is a synchronous buck DC-DC converter delivering 600mA output with 5.0V fixed regulation, +3.5V to +28V input range, 2.1MHz switching frequency, and 25μA quiescent current in SKIP mode-designed for automotive power rails requiring high-voltage tolerance and AEC-Q100 compliance.
For engineers reviewing the MAX16904SAUE50+ datasheet, MAX16904SAUE50+ pinout, MAX16904SAUE50+ application, or MAX16904SAUE50+ equivalent, key selection criteria include its spread-spectrum EMI reduction, 97% dropout duty cycle, PGOOD monitoring, thermal shutdown at +175°C, and compatibility with 16-pin TSSOP-EP layout for industrial and automotive control modules.
Technical Context
The MAX16904SAUE50+ implements current-mode control with internal slope compensation and no external compensation required. It supports three operational modes via SYNC pin: forced fixed-frequency (2.1MHz), SKIP mode (25μA IQ), and external clock synchronization (1.8–2.6MHz).
Its integrated high-side (400–800mΩ RDS(ON)) and low-side (250–450mΩ) MOSFETs enable 97% dropout operation and overcurrent protection at 1.05A typical peak limit. The device features undervoltage lockout (3.0V typ), soft-start (8ms typ), and open-drain PGOOD with 91–94% trip hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2.5% (fixed-frequency mode), ±4.0% (SKIP mode) - ensures stable MCU/ASIC core rail under load transients. |
| Input Voltage Range | +3.5V to +28V, tolerates +42V transients - supports cold-crank and load-dump conditions in 12V/24V automotive systems. |
| Switching Frequency | 2.1MHz (typ), ±6% spread-spectrum enabled - avoids AM band interference and reduces EMI peak emissions. |
| Quiescent Current | 25μA (typ) in SKIP mode - extends battery life in always-on vehicle modules like telematics and body controllers. |
| Output Current | 600mA minimum continuous, 1.05A peak current limit - sustains sensor clusters and CAN transceivers without thermal derating at +125°C. |
| Operating Temperature | -40°C to +125°C ambient - qualified per AEC-Q100 Grade 1 for under-hood and infotainment power stages. |
| Package Thermal Resistance | θJA = 38.3°C/W (TSSOP-EP) - enables 2.09W max dissipation at +70°C ambient with standard 4-layer PCB layout. |
Pinout & Package
MAX16904SAUE50+ uses a thermally enhanced 16-pin TSSOP-EP package (5mm × 4.4mm, exposed pad). The EP must be soldered to PGND for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 16) | Bootstrap capacitor node | Drives high-side FET gate; requires 0.1µF ceramic between BST and LX to sustain >97% duty cycle in dropout. |
| SUP (Pins 2,3) | Main input supply | Accepts +3.5V to +28V; dual pins must be shorted externally; 4.7µF ceramic cap required adjacent to SUP for high-frequency decoupling. |
| LX (Pins 4,5) | Switching node | Connects to inductor; dual pins must be shorted; high dv/dt node requiring tight loop area to minimize EMI. |
| PGND (Pins 6,7,10) | Power ground return | High-current return path for LX and output capacitor; must tie directly to exposed pad and avoid shared traces with analog GND. |
| OUTS (Pin 8) | Voltage sense input | Feedback node for 5.0V regulation; bypassed with ≥10µF X7R ceramic to PGND for stability and transient response. |
| PGOOD (Pin 11) | Open-drain status signal | Pulls low when VOUT < 91% nominal; requires external 20kΩ pull-up to BIAS or system rail for power sequencing. |
| SYNC (Pin 12) | Mode control input | GND/unconnected → SKIP mode; BIAS or external clock → forced PWM; enables dynamic efficiency optimization. |
| BIAS (Pin 13) | Internal LDO output | +5V logic supply; powers internal circuitry; requires 2.2µF ceramic to GND; used as PGOOD pull-up source. |
| GND (Pin 14) | Analog reference ground | Low-noise reference for error amplifier; connect to PGND only at OUTS capacitor return point to prevent noise coupling. |
| EN (Pin 15) | Enable control | High-voltage compatible (up to +42V); active-high; no internal pull-up; driven by microcontroller GPIO or CAN wake signal. |
Key Features
| Feature | Design Value |
|---|---|
| Spread-spectrum modulation | +6% frequency dithering reduces radiated EMI peaks without compromising 2.1MHz base timing accuracy. |
| Ultra-low quiescent current | 25μA in SKIP mode enables >1-year battery standby in always-on automotive modules (e.g., door modules, occupancy sensors). |
| 97% dropout duty cycle | Maintains regulated 5.0V output down to VIN = 5.15V - critical for engine start-up scenarios where battery dips to 6V. |
| Integrated thermal shutdown | Triggers at +175°C junction temperature with 15°C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
| AEC-Q100 qualification | Grade 1 (-40°C to +125°C) qualification ensures reliability in safety-critical automotive subsystems including ADAS camera power supplies. |
Applications
| Automotive Body Control Module | Industrial Sensor Hub Power |
|---|---|
Use Scenario: Powering LIN transceivers, door lock actuators, and ambient light sensors in 12V vehicle architectures with cold-crank voltage drops to 3.5V. IC Role / Device Role / Timing Role: Primary 5V buck regulator supplying MCU I/O, CAN/LIN PHYs, and analog front-ends with PGOOD sequencing. Use Value: 25μA quiescent current minimizes parasitic drain on vehicle battery; +42V transient tolerance eliminates need for upstream TVS clamping. | Use Scenario: Providing stable 5V rail to multi-sensor nodes (temperature, humidity, vibration) in factory automation PLCs operating from unregulated 24V DC bus. IC Role / Device Role / Timing Role: High-efficiency local DC-DC converter replacing linear regulators to reduce heat in sealed enclosures. Use Value: 2.1MHz switching allows use of 4.7µH inductor and compact 10µF output cap - cuts board space by 40% vs. 500kHz alternatives. |
| Automotive Infotainment Display Backlight | Avionics Cabin Monitoring System |
Use Scenario: Generating 5V for display controller SoCs and touch interface ICs in head-unit designs subject to ISO 7637-2 pulse 5a load dump. IC Role / Device Role / Timing Role: Input-stage buck converter feeding downstream LDOs and LED drivers with precise voltage tracking. Use Value: Spread-spectrum EMI reduction meets CISPR 25 Class 5 limits without added ferrite beads or shielding cans. | Use Scenario: Powering smoke detectors, CO sensors, and data loggers in aircraft cabin systems requiring -40°C startup and extended MTBF. IC Role / Device Role / Timing Role: AEC-Q100-compliant primary regulator converting 28V aircraft bus to 5V logic rail with fault reporting via PGOOD. Use Value: Thermal shutdown and overcurrent protection eliminate need for external supervision circuits - simplifies DO-160G compliance testing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480QWRNXTQ1 | 4.5V–36V input, 8A output, 2.1MHz, no spread-spectrum, QFN-16 package | Higher current capacity; lacks PGOOD hysteresis spec and AEC-Q100 Grade 1 temp range | Select for higher-power infotainment processors where 600mA is insufficient; verify thermal design for 8A capability. |
| TPS62933QWRVRRQ1 | 3V–18V input, 3A output, 1.8–4MHz adjustable, spread-spectrum enabled, WQFN-16 | Narrower input range; higher max output current; no +42V transient rating | Prefer for 12V-only systems needing tighter output accuracy (±0.5%) and lower EMI; not suitable for 24V truck platforms. |
Compared with LM61480QWRNXTQ1 and TPS62933QWRVRRQ1, the MAX16904SAUE50+ uniquely combines +42V transient tolerance, AEC-Q100 Grade 1 operation, and factory-trimmed 5.0V output in a cost-optimized TSSOP package-making it optimal for mid-tier automotive body electronics where robustness and footprint matter more than ultra-high current.
Availability
MAX16904SAUE50+ is available at Aetrix Electronics and suitable for automotive body control, industrial sensor hubs, and avionics cabin monitoring systems requiring stable component supply across extended temperature and high-voltage stress conditions.
Supply support for MAX16904SAUE50+ 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 high-voltage, low-quiescent-current buck converters optimized for AEC-Q100-compliant automotive subsystems where input transients, thermal resilience, and EMI control are critical.
FAQ
What is the maximum input voltage transient the MAX16904SAUE50+ can withstand?
The MAX16904SAUE50+ tolerates input voltage transients up to +42V for durations ≤50ns under normal operation and loads up to 600mA. This rating satisfies ISO 7637-2 Pulse 5a requirements for automotive 12V systems and enables direct connection to vehicle battery without external TVS diodes in most implementations. The device remains functional during cold-crank events down to +3.5V input.
Does the MAX16904SAUE50+ require external compensation components?
No, the MAX16904SAUE50+ uses internal current-mode control with built-in slope compensation and does not require external compensation networks. Its fixed 5.0V output and optimized loop response eliminate the need for external resistors or capacitors in the feedback path-reducing BOM count and layout complexity while ensuring stability across the full -40°C to +125°C temperature range.
How does the spread-spectrum feature of the MAX16904SAUE50+ improve EMI performance?
The MAX16904SAUE50+ spreads its 2.1MHz switching frequency by +6% (i.e., 2.1MHz to 2.226MHz) using internal modulation. This dithers energy across a narrow band, reducing peak radiated emissions by up to 10dB compared to fixed-frequency operation-enabling compliance with CISPR 25 Class 5 without adding ferrite beads or metal shielding. The modulation is disabled during external SYNC operation.
What is the purpose of the dual SUP and LX pins on the MAX16904SAUE50+ TSSOP package?
The MAX16904SAUE50+ TSSOP-EP package uses dual SUP (Pins 2,3) and dual LX (Pins 4,5) terminals to reduce parasitic inductance and improve current sharing in high-frequency, high-current paths. Both SUP pins must be shorted externally to handle up to 1.0A RMS switch current; both LX pins must be shorted to minimize voltage overshoot during turn-off and ensure reliable 97% dropout operation.
Can the MAX16904SAUE50+ operate in dropout mode, and what is the minimum input voltage for 5.0V output?
Yes, the MAX16904SAUE50+ operates in dropout by achieving up to 97% duty cycle, enabling regulation down to VIN = VOUT/0.97 ≈ 5.15V for its 5.0V output. At this point, the high-side FET turns off every 6.5μs to recharge the BST capacitor, maintaining gate drive integrity. This behavior is confirmed across the full -40°C to +125°C range and supports engine cranking scenarios where battery voltage dips below 6V.
MAX16904SAUE50+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX16904SAUE50+ FAQ
1.How can I place an order for MAX16904SAUE50+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16904SAUE50+ 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 MAX16904SAUE50+ reliable?
The price and inventory of MAX16904SAUE50+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16904SAUE50+ is usually 5 days.
3.What payment methods are accepted for MAX16904SAUE50+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16904SAUE50+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16904SAUE50+?
MAX16904SAUE50+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16904SAUE50+ 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 MAX16904SAUE50+?
For technical support, including MAX16904SAUE50+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16904SAUE50+ requirements.
6.How does Aetrix verify that MAX16904SAUE50+ is sourced from the original manufacturer or authorized distributors?
All MAX16904SAUE50+ 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 MAX16904SAUE50+ meets industry standards.
7.What is the process for return or replacement of MAX16904SAUE50+?
All MAX16904SAUE50+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16904SAUE50+, 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 MAX16904SAUE50+ part is unused and in its original packaging.
Return procedure for MAX16904SAUE50+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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