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Analog Devices Inc./Maxim Integrated MAXM17901AMB+
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- Part No.:
- MAXM17901AMB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- DC DC Converters
- Package:
- 10-SMD Module
- Datasheet:
-
MAXM17901AMB+.pdf
- Description:
- IC REG BUCK 3.3V 300MA 10EMGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,848
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Product details
Overview
The MAXM17901AMB+ from Maxim Integrated is a fixed-output 3.3V, 300mA synchronous step-down DC-DC power module with integrated controller, MOSFETs, compensation, and inductor. It operates from 4.5V to 24V input, features ±1.5% feedback accuracy, 4.1ms soft-start, and delivers regulated power for space-constrained industrial sensors and 4–20mA loop-powered systems.
For engineers reviewing the MAXM17901AMB+ datasheet, MAXM17901AMB+ pinout, MAXM17901AMB+ application, or MAXM17901AMB+ equivalent, key selection criteria include its uSLIC™ package footprint, open-drain RESET output behavior, PFM/PWM mode control via MODE pin, and verified compliance with CISPR22 Class B emissions.
Technical Context
The MAXM17901AMB+ employs peak-current-mode control with internal slope compensation and fixed 500kHz switching frequency (typ). Its architecture integrates a 5V LDO (VCC) with 4.18V UVLO rising threshold and supports prebias startup without output capacitor discharge.
It implements hiccup-mode overcurrent protection triggered by FB voltage dropping below 64.5% of regulation or inductor current limit violation, with 131ms timeout and automatic soft-start retry. Thermal shutdown activates at 166°C junction temperature with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 24V - supports wide industrial input rails including 12V and 24V bus systems. |
| Output Voltage | Fixed 3.3V ±1.5% - eliminates external feedback resistors and simplifies layout for standard logic rail generation. |
| Max Output Current | 300mA - sufficient for powering microcontrollers, sensors, and low-power peripherals in compact designs. |
| Switching Frequency | 465–535kHz - enables use of small external capacitors and avoids AM radio band interference. |
| Soft-Start Time | 3.8–4.4ms - prevents input inrush current and ensures controlled output ramp-up during power-on. |
| Shutdown Current | 2.2μA (typ) - enables ultra-low-power standby in battery-backed or energy-harvesting applications. |
| Operating Temp | −40°C to +125°C ambient - qualified for harsh industrial and automotive under-hood environments. |
Pinout & Package
Package: 10-pin uSLIC™ (2.6mm × 3mm × 1.5mm), RoHS-compliant, land pattern per Maxim drawing 90-100027.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LX | Switching node | Internal connection to inductor and MOSFET bridge; no external component required - reduces EMI and layout sensitivity. |
| 2 GND | Power ground | Primary thermal and electrical return path; must be connected to solid ground plane per PCB layout guidelines. |
| 3 RESET | Open-drain power-good | Asserts low when FB < 92% of regulation; high-impedance 2ms after FB > 95.5% - enables system-level power sequencing and fault monitoring. |
| 4 MODE | PFM/PWM selection | GND = forced PWM (fixed frequency); unconnected = PFM (pulse-skipping for light-load efficiency). |
| 5 OUT | Regulated output | 3.3V output node; requires 10µF ceramic capacitor to GND for stability and transient response. |
| 6 FB | Feedback input | Connected directly to VOUT for MAXM17901 - eliminates external resistor divider and associated tolerance errors. |
| 7 VCC | Internal 5V LDO output | Bypassed with ≥1µF ceramic cap; powers internal circuitry and gate drivers - dropout ≤300mV ensures robust operation down to VIN = 4.5V. |
| 8 EN/UVLO | Enable/UVLO input | Active-high; 1.215V (typ) turn-on threshold - supports programmable input UVLO via external resistor divider or direct VIN tie. |
| 9–10 VIN | Input power supply | Dual pins for low-inductance, high-current input path; require local 1µF ceramic decoupling close to pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated inductor + MOSFETs | Eliminates 6–8 external components and reduces design risk - achieves plug-and-play power solution with minimal BOM count. |
| All-ceramic capacitor support | Enables compact, high-reliability designs without electrolytic or tantalum capacitors - improves lifetime and temperature stability. |
| CISPR22 Class B compliance | Meets conducted/radiated emission limits without external filtering - accelerates EMC certification for industrial end equipment. |
| Hiccup overcurrent protection | Self-recovering fault response with 131ms timeout - protects against sustained shorts while avoiding latch-off in transient overload conditions. |
| Prebias startup capability | Starts safely into existing output voltage without discharging downstream capacitance - essential for multi-rail digital systems with staggered power sequencing. |
Applications
| Industrial Sensors and Encoders | 4–20mA Current-Loop Powered Sensors |
|---|---|
Use Scenario: Powering analog sensor front-ends in factory automation PLC modules where board space and thermal dissipation are constrained. IC Role / Device Role / Timing Role: Primary point-of-load regulator delivering stable 3.3V to signal-conditioning ICs and ADCs. Use Value: Fixed 3.3V output eliminates feedback resistor tuning; uSLIC™ package enables placement near sensor inputs to minimize noise coupling. | Use Scenario: Supplying auxiliary power to loop-powered transmitters operating from 4–20mA current sources with limited headroom. IC Role / Device Role / Timing Role: Efficient step-down converter extracting regulated 3.3V from 12–24V loop supply rails. Use Value: 4.5V minimum input allows operation even at lowest loop compliance voltage; 2.2μA shutdown current preserves loop integrity during sleep modes. |
| LDO Replacement | Battery-Powered Equipment |
Use Scenario: Upgrading legacy linear regulators in embedded controllers to reduce heat and extend runtime. IC Role / Device Role / Timing Role: High-efficiency buck module replacing inefficient 3.3V LDOs in FPGA I/O banks or MCU core supplies. Use Value: 90%+ efficiency at 300mA vs. ~50% for LDOs at same load - cuts thermal load and enables smaller heatsinks or no heatsink. | Use Scenario: Powering portable diagnostic tools or handheld meters with single-cell Li-ion or dual-cell alkaline batteries. IC Role / Device Role / Timing Role: Main system regulator supporting wake/sleep cycles with ultra-low quiescent current. Use Value: PFM mode delivers >85% efficiency at 1mA load; 2.2μA shutdown current extends shelf life and battery storage duration. |
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 |
|---|---|---|---|
| MAXM17903AMB+ | Adjustable 0.9V–5V output; requires external resistor divider on FB pin; identical package and pinout. | Suitable when multiple output voltages are needed across product variants or when 3.3V is not the final target rail. | Select MAXM17903AMB+ only if adjustable output is required - MAXM17901AMB+ offers simpler layout and tighter tolerance for fixed 3.3V use cases. |
| TSM10331D | 3.3V fixed output, 600mA rating, 3.5mm × 3.5mm × 1.6mm QFN; no integrated inductor; requires external inductor and compensation. | Used where higher current or discrete inductor selection is preferred; lacks built-in EMI filtering and CISPR22 compliance. | Choose TSM10331D only if 600mA output or custom inductor optimization is mandatory - MAXM17901AMB+ provides faster time-to-market with validated performance. |
Compared with MAXM17903AMB+, the MAXM17901AMB+ saves layout effort and improves output accuracy by eliminating feedback resistors; versus TSM10331D, it delivers lower system-level EMI, reduced component count, and guaranteed Class B compliance without design iteration.
Availability
MAXM17901AMB+ is available at Aetrix Electronics and suitable for industrial sensors and encoders, 4–20mA current-loop powered sensors, and LDO replacement applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for MAXM17901AMB+ 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, medical, and communications markets.
The Himalaya uSLIC™ power module family targets space-constrained, thermally demanding applications where integration, reliability, and fast design cycle are critical - specifically engineered to replace discrete buck solutions with certified performance.
FAQ
What is the maximum output current capability of the MAXM17901AMB+?
The MAXM17901AMB+ delivers up to 300mA of continuous output current under typical conditions (VIN = 12V, TA = +25°C). Derating applies above +85°C ambient due to thermal limits; full 300mA is maintained up to +125°C ambient when using proper PCB copper area per Maxim's layout guidelines. The device enters hiccup-mode protection if output current exceeds safe operating limits.
Does the MAXM17901AMB+ require external feedback resistors?
No, the MAXM17901AMB+ does not require external feedback resistors. As a fixed 3.3V output variant, its FB pin connects directly to the OUT node internally - eliminating resistor tolerance errors, layout sensitivity, and component count. This differs from the adjustable MAXM17903AMB+, which requires an external resistor divider on FB.
How does the MODE pin affect efficiency in the MAXM17901AMB+?
When MODE is left unconnected, the MAXM17901AMB+ operates in PFM mode at light loads (<30mA), achieving >85% efficiency by skipping pulses. When MODE is grounded, it forces constant-frequency PWM mode across all loads, maintaining fixed 500kHz switching but reducing light-load efficiency by ~10–15% - chosen for EMI-sensitive or frequency-critical applications.
What is the function of the RESET pin on the MAXM17901AMB+?
The RESET pin on the MAXM17901AMB+ is an open-drain power-good indicator. It goes high-impedance 2ms after FB rises above 95.5% of 3.3V (i.e., ≥3.16V), and pulls low when FB falls below 92% (≤3.04V). It remains low during hiccup-mode timeout and supports external pull-up to any logic-compatible voltage (e.g., 3.3V or 5V).
Can the MAXM17901AMB+ start up into a prebiased output voltage?
Yes, the MAXM17901AMB+ supports startup into a prebiased output without discharging the output capacitor - in both PFM and forced-PWM modes. This feature prevents bus contention and voltage droop in multi-rail systems where other supplies may already be active, making it suitable for FPGA, MCU, and ASIC power sequencing.
MAXM17901AMB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-SMD Module
- Packaging:
- Strip
- Product Status:
- Active
- Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 24V
- Voltage - Output 1:
- -
- Voltage - Output 2:
- -
- Voltage - Output 3:
- -
- Voltage - Output 4:
- -
- Current - Output (Max):
- -
- Power (Watts):
- -
- Voltage - Isolation:
- -
- Applications:
- -
- Features:
- -
- 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:
- -
MAXM17901AMB+ FAQ
1.How can I place an order for MAXM17901AMB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAXM17901AMB+ 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 MAXM17901AMB+ reliable?
The price and inventory of MAXM17901AMB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAXM17901AMB+ is usually 5 days.
3.What payment methods are accepted for MAXM17901AMB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAXM17901AMB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAXM17901AMB+?
MAXM17901AMB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAXM17901AMB+ 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 MAXM17901AMB+?
For technical support, including MAXM17901AMB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAXM17901AMB+ requirements.
6.How does Aetrix verify that MAXM17901AMB+ is sourced from the original manufacturer or authorized distributors?
All MAXM17901AMB+ 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 MAXM17901AMB+ meets industry standards.
7.What is the process for return or replacement of MAXM17901AMB+?
All MAXM17901AMB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAXM17901AMB+, 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 MAXM17901AMB+ part is unused and in its original packaging.
Return procedure for MAXM17901AMB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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