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Analog Devices Inc./Maxim Integrated MAXM17904AMB+
- Part No.:
- MAXM17904AMB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- DC DC Converters
- Package:
- 10-SMD Module
- Datasheet:
-
MAXM17904AMB+.pdf
- Description:
- DC DC CONVERTER 3.3V
- Quantity:
- Payment:
- Shipping:
Inventory:3,198
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Product details
Overview
MAXM17904AMB+ from Maxim Integrated is a fixed 3.3V, 300mA synchronous step-down DC-DC power module with integrated controller, MOSFETs, compensation, and inductor in a compact uSLIC™ package. It operates from 4.5V to 24V input, delivers ±1.5% feedback accuracy, employs peak-current-mode control, and features a 3.75ms soft-start. It is used in industrial sensors, 4–20mA loop-powered devices, and point-of-load regulation where space-constrained, low-noise, plug-and-play power is required.
For engineers reviewing the MAXM17904AMB+ datasheet, MAXM17904AMB+ pinout, MAXM17904AMB+ application, or MAXM17904AMB+ equivalent, this page provides verified technical context, real-world operating parameters, validated pin functions, application-specific design value, and confirmed alternative options for LDO replacement and compact DC-DC conversion in harsh ambient environments.
Technical Context
The MAXM17904AMB+ implements a peak-current-mode controlled synchronous buck architecture with internal soft-start (3.75ms), prebias startup capability, and open-drain RESET output triggered by FB voltage thresholds (90–94% falling, 93.5–97.5% rising). It supports selectable PFM/PWM operation via the MODE pin and includes hiccup overcurrent protection and thermal shutdown at +166°C.
It integrates all power train components-including the inductor-within a thermally enhanced 10-pin uSLIC™ package (2.6mm × 3mm × 1.5mm), enabling full ceramic capacitor designs and compliance with CISPR22 Class B conducted/radiated emissions without external filtering. Its -40°C to +125°C ambient operating range supports deployment in HVAC, battery-powered equipment, and industrial encoders.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±1.5% regulation accuracy ensures stable MCU core or sensor biasing without external feedback resistors. |
| Input Voltage Range | 4.5V to 24V enables direct use across wide-input industrial rails, including 12V and 24V systems, eliminating need for upstream pre-regulation. |
| Max Output Current | 300mA continuous output supports typical loads like microcontrollers, transceivers, and analog front-ends in space-constrained modules. |
| Switching Frequency | 515–585kHz fixed-frequency PWM mode ensures predictable EMI behavior and simplifies filter design versus variable-frequency alternatives. |
| Shutdown Current | 2.2μA typical enables ultra-low-power sleep states in battery-backed or energy-harvested sensor nodes. |
| Operating Temperature | -40°C to +125°C ambient rating allows reliable deployment in uncontrolled industrial enclosures and outdoor building controls. |
| Package | 10-pin uSLIC™ (2.6mm × 3mm × 1.5mm) provides high power density and simplified PCB layout with integrated inductor and thermal pad. |
Pinout & Package
MAXM17904AMB+ uses a 10-pin uSLIC™ package (outline 21-100094, land pattern 90-100027) with exposed thermal pad for efficient heat dissipation. The compact 2.6mm × 3mm footprint supports high-density layouts in portable and modular industrial electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - LX | Switching node | Internal connection to inductor and high-side/low-side MOSFETs; no external connection permitted - must be routed with minimal loop area for EMI control. |
| 2 - GND | Power ground | Main return path for power and signal currents; requires low-impedance connection to PCB ground plane beneath thermal pad. |
| 3 - RESET | Open-drain power-good | Asserts low when FB drops below 92% of setpoint; pulled high externally to indicate valid output; 1.9ms delay on assertion ensures stable startup. |
| 4 - MODE | PFM/PWM selection | Grounded for forced PWM (constant frequency); floating for automatic PFM at light load to maximize efficiency down to μA-level quiescent current. |
| 5 - OUT | Regulated output | Delivers 3.3V to load; requires local ceramic output capacitor (≥10μF) placed adjacent to pin for transient response and stability. |
| 6 - FB | Feedback input | Monitors regulated output via internal resistor divider; not connected externally for MAXM17904AMB+ (fixed 3.3V version). |
| 7 - EN/UVLO | Enable / input UVLO | Active-high enable with programmable threshold (1.19–1.28V rising); disables regulator below ~1.09V to prevent brownout operation. |
| 8 - VIN | Main input supply | Accepts 4.5V–24V; requires ≥1μF ceramic input capacitor near pin to suppress ripple and support peak current demands. |
| 9 - VCC | Bias supply output | 5V ±2.5% LDO output (4.75–5.25V) powers internal circuitry; can source up to 30mA for auxiliary logic or level-shifting. |
| 10 - NC | No connect | Unused pin; must remain unconnected per datasheet - no routing or soldering required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated inductor + power train | Eliminates external inductor selection, layout sensitivity, and magnetic coupling risks - reduces bill-of-materials and design cycle time. |
| All-ceramic capacitor support | Enables small, reliable, low-ESR input/output filtering without tantalum or electrolytic capacitors - improves lifetime and temperature stability. |
| Programmable EN/UVLO threshold | Allows precise system-level power sequencing and brownout protection by adjusting external resistor divider on EN/UVLO pin. |
| CISPR22 Class B compliance | Meets radiated/conducted EMI limits without external filters - accelerates EMC certification for industrial and building automation products. |
| Hiccup overcurrent + thermal shutdown | Provides self-recovering fault protection during short-circuit or overload conditions, enhancing field reliability in unattended deployments. |
Applications
| Industrial Sensors and Encoders | 4–20mA Current-Loop Powered Sensors |
|---|---|
|
Use Scenario: Powering rotary encoders and analog pressure/temperature sensors mounted in factory-floor machinery with limited board space and high ambient temperatures. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator delivering clean, stable voltage to sensor signal conditioning and microcontroller peripherals. Use Value: Compact uSLIC™ package and -40°C to +125°C operation ensure reliable function inside sealed metal enclosures without heatsinking or derating. |
Use Scenario: Supplying 3.3V logic and analog circuitry in loop-powered field transmitters where input power is derived solely from the 4–20mA loop. IC Role / Device Role / Timing Role: Efficient step-down converter accepting up to 24V loop drop while maintaining tight regulation under varying load current. Use Value: 2.2μA shutdown current and PFM mode extend usable loop voltage range and improve minimum-loop-current margin for diagnostics. |
| LDO Replacement | HVAC and Building Control |
|
Use Scenario: Replacing inefficient linear regulators in battery- or energy-harvested wireless sensor nodes where thermal and efficiency constraints prohibit LDO use. IC Role / Device Role / Timing Role: High-efficiency (up to 90%) switching regulator providing 3.3V rail with dynamic load response and low-noise output via ceramic filtering. Use Value: 300mA output and 515–585kHz switching enable smaller capacitors than lower-frequency alternatives - reducing total solution size vs. discrete buck ICs. |
Use Scenario: Powering Zigbee/BLE radios, display drivers, and environmental sensors in wall-mounted thermostats and zone controllers with long service life requirements. IC Role / Device Role / Timing Role: Primary DC-DC converter converting 12–24V HVAC system supply to 3.3V for digital subsystems and communication interfaces. Use Value: Built-in RESET output enables safe microcontroller reset during brownout events, while thermal shutdown prevents failure during summer peak-load conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down power module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAXM17905AMB+ | Fixed 5V output (vs. 3.3V); identical package, pinout, and feature set except FB network and regulation point. | Suitable for 5V I/O domains, USB peripherals, or legacy logic requiring 5V supply - not interchangeable without schematic revision. | Select MAXM17905AMB+ only when 5V output is required; shares same layout and thermal profile but requires FB pin rework if substituted. |
| TFS7703-33 | 3.3V fixed-output module from ON Semiconductor; 3mm × 3mm × 1.5mm package; 4.5–36V input; 200mA max output; no integrated VCC LDO. | Lower output current and missing VCC rail limit use in systems requiring auxiliary bias; lacks RESET and MODE pins for advanced control. | Choose TFS7703-33 only for cost-sensitive, lower-current applications where VCC and RESET functionality are unnecessary. |
Compared with MAXM17904AMB+, MAXM17905AMB+ offers identical mechanical and thermal performance with a different output voltage, while TFS7703-33 trades current capability and integrated features for lower cost and wider input range - making it suitable only for simpler, lower-power designs.
Availability
MAXM17904AMB+ is available at Aetrix Electronics and suitable for industrial sensors and encoders, 4–20mA loop-powered sensors, and HVAC and building control systems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAXM17904AMB+ 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 industrial, automotive, and communications markets.
The Himalaya uSLIC™ power module product line was engineered to deliver complete, high-efficiency DC-DC solutions in ultra-small packages - targeting space-constrained, thermally demanding applications such as smart sensors, IoT edge nodes, and modular control systems.
FAQ
What is the output voltage tolerance of the MAXM17904AMB+?
The MAXM17904AMB+ provides a fixed 3.3V output with ±1.5% regulation accuracy over line, load, and temperature. This specification is guaranteed across the full -40°C to +125°C ambient operating range and ensures compatibility with 3.3V logic families and precision analog circuitry without external trimming.
Does the MAXM17904AMB+ require external feedback resistors?
No - the MAXM17904AMB+ is a fixed-output variant with internal feedback divider. Pin 6 (FB) is internally connected and must remain unconnected on the PCB. External resistors are only required for the adjustable MAXM17906 variant.
Can the MAXM17904AMB+ operate with a 24V input supply?
Yes - the MAXM17904AMB+ supports input voltages from 4.5V to 24V continuously. At 24V input, it maintains full 300mA output capability with appropriate thermal management, as confirmed by the "Output Current vs. Ambient Temperature" curves in the datasheet.
What is the purpose of the VCC pin on the MAXM17904AMB+?
The VCC pin delivers a regulated 5V ±2.5% output capable of sourcing up to 30mA. It powers internal control circuitry and can also supply auxiliary loads such as level shifters, comparators, or low-power logic - eliminating the need for a separate LDO in many designs.
How does the RESET pin function on the MAXM17904AMB+?
The RESET pin is an open-drain output that goes low when the FB voltage falls below 92% of its nominal value (e.g., <3.036V for 3.3V output) and returns to high-impedance 1.9ms after FB rises above 95.5% (e.g., >3.151V). An external pull-up resistor is required to generate a logic-high signal for microcontroller reset.
MAXM17904AMB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-SMD Module
- Packaging:
- Strip
- Product Status:
- Active
- Type:
- Non-Isolated PoL Module
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output 1:
- 3.3V
- Voltage - Output 2:
- -
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- 300mA
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- ITE (Commercial)
- Features:
- OCP, OTP
- Operating Temperature:
- -40°C ~ 125°C
- Efficiency:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-eMGA (3x2.6)
- Control Features:
- -
- Approval Agency:
- -
- Standard Number:
- -
MAXM17904AMB+ FAQ
1.How can I place an order for MAXM17904AMB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAXM17904AMB+ 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 MAXM17904AMB+ reliable?
The price and inventory of MAXM17904AMB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAXM17904AMB+ is usually 5 days.
3.What payment methods are accepted for MAXM17904AMB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAXM17904AMB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAXM17904AMB+?
MAXM17904AMB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAXM17904AMB+ 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 MAXM17904AMB+?
For technical support, including MAXM17904AMB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAXM17904AMB+ requirements.
6.How does Aetrix verify that MAXM17904AMB+ is sourced from the original manufacturer or authorized distributors?
All MAXM17904AMB+ 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 MAXM17904AMB+ meets industry standards.
7.What is the process for return or replacement of MAXM17904AMB+?
All MAXM17904AMB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAXM17904AMB+, 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 MAXM17904AMB+ part is unused and in its original packaging.
Return procedure for MAXM17904AMB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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