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Analog Devices Inc./Maxim Integrated MAX16904RATB33/V+
- Part No.:
- MAX16904RATB33/V+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX16904RATB33/V+.pdf
- Description:
- IC REG BUCK 3.3V 600MA 10TDFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX16904RATB33/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, and 25μA no-load quiescent current-designed for automotive power rails requiring high transient tolerance (+42V) and AEC-Q100 qualification.
For engineers reviewing the MAX16904RATB33/V+ datasheet, MAX16904RATB33/V+ pinout, MAX16904RATB33/V+ application, or MAX16904RATB33/V+ equivalent, this page provides verified package mapping (10-pin TDFN-EP), confirmed thermal performance (θJA = 41°C/W), validated PGOOD behavior (91–98% threshold), real-world dropout operation (97% duty cycle), and precise SKIP-mode current threshold (350mA).
Technical Context
The MAX16904RATB33/V+ implements current-mode control with internal slope compensation and requires no external loop compensation. Its 80ns minimum on-time enables stable regulation down to 3.3V output even at 18V input, while its 97% max duty cycle sustains regulation during cold-crank automotive transients.
Three SYNC-configurable operating modes are supported: forced fixed-frequency PWM (2.1MHz ±6.5%), SKIP mode (25μA IQ, pulse-skipping below 350mA peak inductor current), and external synchronization (1.8–2.6MHz). Spread-spectrum modulation is disabled per ordering code "R" (vs. "S"), eliminating frequency dithering.
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 - meets ISO 7637-2 Pulse 1/2/5a for automotive battery systems |
| Max Output Current | 600mA continuous, 1.05A peak current limit - supports typical infotainment SoC core or sensor cluster loads |
| Switching Frequency | 2.1MHz (typ), 1.925–2.275MHz (min/max) - enables use of ≤4.7μH inductors and compact 0603/0805 ceramic capacitors |
| Quiescent Current | 25μA (typ) in SKIP mode at no load - extends battery life in always-on vehicle modules (e.g., telematics, CAN gateways) |
| Thermal Range | -40°C to +125°C junction - qualified per AEC-Q100 Grade 1, suitable for under-hood and cabin-mounted ECUs |
| PGOOD Threshold | 91–94% falling, 93–98% rising - provides robust power-rail monitoring with 3% hysteresis for noise immunity |
Pinout & Package
MAX16904RATB33/V+ uses a thermally enhanced 10-pin TDFN-EP package (3mm × 3mm × 0.75mm, exposed pad soldered to PGND) with θJA = 41°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap capacitor node for high-side FET gate drive | Requires 0.1µF X7R ceramic placed adjacent to pin; enables 100% duty cycle operation in dropout |
| SUP | Main input supply (3.5–28V) | Connect 4.7µF ceramic capacitor directly to PGND; withstands 42V transients without damage |
| LX | Switching node between high- and low-side FETs | High dv/dt node; route short, wide, and isolated from analog traces to minimize EMI coupling |
| PGND | Power ground return for high-current paths | Must be connected to exposed pad; separate from analog GND except at single point near OUTS capacitor |
| OUTS | Feedback sense input for regulated 3.3V output | Connect 10µF X7R ceramic to PGND; sets output accuracy and loop stability without external compensation |
| PGOOD | Open-drain power-good status signal | Pulls low when VOUT < 91% nominal; requires external 20kΩ pull-up to BIAS or system rail |
| SYNC | Mode selection and synchronization input | GND/unconnected → SKIP mode; BIAS or clock → forced PWM; no internal pullup/pulldown |
| BIAS | Internal 5V LDO output for logic and gate drive | Decouple with 2.2µF ceramic to GND; powers internal circuitry and can source SYNC pull-up |
| GND | Analog ground reference | Connect only to PGND at single point near OUTS capacitor; isolates noise-sensitive feedback path |
| EN | Enable input with high-voltage tolerance | Logic-high ≥2.4V activates regulator; accepts 3.3V CMOS or automotive battery-level signals up to +42V |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high- and low-side DMOS switches | RDS(ON) = 400–800mΩ (HS), 250–450mΩ (LS) - eliminates external MOSFETs and gate drivers, reducing BOM count and layout area |
| Ultra-low IQ SKIP mode | 25μA typical no-load current - enables >1-year battery standby in always-on automotive modules without compromising startup time |
| Dropout operation at 97% duty cycle | Regulates 3.3V output with input as low as 3.4V - sustains critical ECU functions during engine cranking (cold-crank to 3.2V) |
| AEC-Q100 Grade 1 qualification | -40°C to +125°C operation with thermal shutdown at 175°C (15°C hysteresis) - certified for front-end automotive power conversion |
| Enable-compatible from 3.3V logic to +42V | No level-shifting required - interfaces directly with MCU GPIOs or high-side CAN inhibit signals without external components |
Applications
| Automotive Body Control Module (BCM) | Automotive Infotainment Power Rail |
|---|---|
Use Scenario: Supplies 3.3V to microcontroller, CAN transceiver, and LIN interface in door module or lighting ECU. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator with cold-crank support and PGOOD monitoring for system reset coordination. Use Value: Maintains regulation during 3.2V battery dips; 25μA IQ extends sleep-mode battery life; AEC-Q100 ensures reliability over 15-year vehicle lifetime. |
Use Scenario: Powers audio DSP, display controller, and touch interface in head unit with strict EMI limits. IC Role / Device Role / Timing Role: High-frequency (2.1MHz) buck converter enabling small LC filter size and avoiding AM band interference. Use Value: 2.1MHz switching avoids 530–1710kHz AM radio band; spread-spectrum disabled per R-suffix reduces jitter sensitivity in audio signal chains. |
| Industrial Telematics Gateway | Railway Onboard Monitoring System |
Use Scenario: Converts 24V train/bus supply to 3.3V for GPS/GNSS receiver, cellular modem, and secure boot MCU. IC Role / Device Role / Timing Role: Input-transient-tolerant DC-DC with enable control for remote wake-up and deep-sleep sequencing. Use Value: Withstands +42V load-dump transients; EN pin accepts direct 24V logic for firmware-controlled power cycling; PGOOD confirms rail readiness before modem initialization. |
Use Scenario: Powers vibration sensors, temperature nodes, and wireless transceivers in EN 50155-compliant rolling stock equipment. IC Role / Device Role / Timing Role: Wide-input, high-temp buck regulator with thermal shutdown and undervoltage lockout for unventilated enclosures. Use Value: -40°C to +125°C operation covers full EN 50155 ambient range; 175°C thermal shutdown prevents field failures in sealed cabinets; 41°C/W θJA simplifies heatsinking. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM61480RQWR | 3.3V fixed output, 1.5MHz switching, 1.2A rating, no spread-spectrum option, 30μA IQ in LP mode | Higher current capacity but larger solution size; lacks +42V transient tolerance and AEC-Q100 Grade 1 rating | Select when >600mA load or lower EMI priority outweighs automotive qualification and cold-crank support |
| TPS62933RTER | 3.3V fixed output, 2.25MHz switching, 3A rating, 15μA IQ, integrated ferrite-bead filter, no AEC-Q100 | Higher efficiency at light loads and superior ripple suppression, but rated only to +105°C and unqualified for automotive | Select for industrial IoT gateways needing ultra-low IQ and low-noise 3.3V rail where temperature and qualification are less stringent |
Compared with LM61480RQWR and TPS62933RTER, the MAX16904RATB33/V+ trades higher current and ultra-low IQ for guaranteed automotive qualification, cold-crank resilience, and proven +42V transient survival-making it the sole choice for safety-critical or under-hood 3.3V power domains.
Availability
MAX16904RATB33/V+ is available at Aetrix Electronics and suitable for automotive body control modules, infotainment subsystems, and industrial telematics gateways requiring stable component supply across extended temperature and voltage stress conditions.
Supply support for MAX16904RATB33/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 demanding industrial, automotive, and communications applications.
The MAX16904 series is a family of high-voltage, low-IQ synchronous buck converters engineered specifically for automotive power systems requiring AEC-Q100 qualification, cold-crank operation, and transient robustness.
FAQ
What is the exact output voltage tolerance of the MAX16904RATB33/V+ in fixed-frequency mode?
The MAX16904RATB33/V+ delivers 3.3V output with ±2.5% tolerance in forced fixed-frequency PWM mode across -40°C to +125°C, 6V ≤ VSUP ≤ 18V, and 0–600mA load. This specification is production-tested and guaranteed-not just design-simulated-ensuring reliable 3.3V rail accuracy for automotive microcontrollers and peripherals.
Does the MAX16904RATB33/V+ support synchronization to an external clock, and what is the valid frequency range?
Yes, the MAX16904RATB33/V+ supports external clock synchronization via the SYNC pin across 1.8MHz to 2.6MHz. When a clock signal within this range is applied, the device enters forced PWM mode and locks its switching frequency to the external source-enabling coherent multi-rail timing in complex automotive power systems.
Is spread-spectrum modulation enabled on the MAX16904RATB33/V+, and how does it affect EMI performance?
No, spread-spectrum modulation is disabled on the MAX16904RATB33/V+ (ordering code "R" denotes non-spread-spectrum version). This eliminates frequency dithering, resulting in tighter spectral peaks but predictable EMI signatures-ideal for applications where deterministic noise filtering is preferred over broadband reduction.
What is the maximum continuous output current capability of the MAX16904RATB33/V+, and how is overcurrent protection implemented?
The MAX16904RATB33/V+ delivers 600mA continuously and limits peak inductor current to 1.05A (typ). Overcurrent protection triggers a soft-start restart every 30ms upon detection of OUTS < 1.5V (typ); thermal shutdown engages if junction temperature exceeds 175°C. These protections are fully integrated and require no external components.
How does the MAX16904RATB33/V+ behave during automotive cold-crank events, and what design features ensure operation down to 3.2V input?
During cold-crank, the MAX16904RATB33/V+ maintains 3.3V regulation by operating at 97% duty cycle, turning off the high-side FET every 6.5μs to recharge the BST capacitor. Its 80ns minimum on-time and dropout-capable architecture allow uninterrupted operation down to 3.2V input-verified per ISO 16750-2 cold-crank test profiles.
MAX16904RATB33/V+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- 10-TDFN (3x3)
MAX16904RATB33/V+ FAQ
1.How can I place an order for MAX16904RATB33/V+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX16904RATB33/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 MAX16904RATB33/V+ reliable?
The price and inventory of MAX16904RATB33/V+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX16904RATB33/V+ is usually 5 days.
3.What payment methods are accepted for MAX16904RATB33/V+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX16904RATB33/V+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX16904RATB33/V+?
MAX16904RATB33/V+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX16904RATB33/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 MAX16904RATB33/V+?
For technical support, including MAX16904RATB33/V+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX16904RATB33/V+ requirements.
6.How does Aetrix verify that MAX16904RATB33/V+ is sourced from the original manufacturer or authorized distributors?
All MAX16904RATB33/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 MAX16904RATB33/V+ meets industry standards.
7.What is the process for return or replacement of MAX16904RATB33/V+?
All MAX16904RATB33/V+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX16904RATB33/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 MAX16904RATB33/V+ part is unused and in its original packaging.
Return procedure for MAX16904RATB33/V+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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