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Analog Devices Inc./Maxim Integrated MAXM17905AMB+
- Part No.:
- MAXM17905AMB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- DC DC Converters
- Package:
- 10-SMD Module
- Datasheet:
-
MAXM17905AMB+.pdf
- Description:
- DC DC CONVERTER 5V
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
MAXM17905AMB+ from Maxim Integrated is a fixed 5V, 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% output voltage accuracy, features open-drain power-good (RESET), and supports PFM/PWM mode selection - ideal for space-constrained industrial sensors and USB Type-C powered loads.
For engineers reviewing the MAXM17905AMB+ datasheet, MAXM17905AMB+ pinout, MAXM17905AMB+ application, or MAXM17905AMB+ equivalent, this page provides verified electrical specifications, thermal performance data, pin-level circuit roles, real-world load transient behavior, and validated alternative options for point-of-load regulation in harsh ambient environments.
Technical Context
The MAXM17905AMB+ employs peak-current-mode control architecture with internal soft-start (3.75ms fixed) and prebias startup capability. Its integrated inductor and all-ceramic capacitor support simplify layout while maintaining stability across -40°C to +125°C ambient operation.
It features hiccup-mode overcurrent protection, thermal shutdown at 166°C with 10°C hysteresis, and meets CISPR22 Class B conducted/radiated emissions standards. The RESET pin asserts low when FB falls below 92% of regulation voltage and releases after 1.9ms delay upon FB rising above 95.5%.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±1.5% - ensures stable MCU core or interface rail without external feedback resistors. |
| Input Voltage Range | 4.5V to 24V - supports wide industrial input sources including 12V/24V bus and battery-backed systems. |
| Max Output Current | 300mA continuous - sufficient for microcontrollers, sensors, and low-power peripherals without derating at +85°C. |
| Switching Frequency | 550kHz typical - enables small external capacitors and predictable EMI filtering design. |
| Shutdown Current | 2.2μA typical - minimizes quiescent drain in always-on battery-powered equipment. |
| Operating Temperature | -40°C to +125°C ambient - qualified for HVAC, building control, and industrial encoders. |
| Package Dimensions | 2.6mm × 3mm × 1.5mm uSLIC™ - ultra-low profile enables placement under connectors or in stacked PCB assemblies. |
Pinout & Package
Package: 10-pin uSLIC™ (M102A3+2), 2.6mm × 3mm × 1.5mm, RoHS-compliant, land pattern 90-100027.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 LX | Switching node | Internal connection to inductor and high-side/low-side MOSFETs; no external component required. |
| 2 GND | Power ground | Primary return path for power and control circuits; must connect directly to low-impedance ground plane. |
| 3 RESET | Open-drain power-good | Signals valid output voltage; requires external pull-up; delays 1.9ms after FB exceeds 95.5% threshold. |
| 4 MODE | PFM/PWM selection | Ground for forced PWM; floating for automatic PFM at light load - optimizes efficiency across load range. |
| 5 OUT | Regulated output | Delivers 5V to load; requires ceramic output capacitor (10µF typical) placed close to pin. |
| 6 FB | Feedback input | Internally connected to 5.00V reference; not used in fixed-output MAXM17905AMB+ (no external resistor divider). |
| 7 EN/UVLO | Enable / input UVLO | Active-high enable with 1.215V typical rising threshold; disables regulator when VIN drops below ~4.1V. |
| 8 VIN | Main input supply | Accepts 4.5V–24V; powers internal circuitry and switching stage; requires 1µF ceramic input capacitor. |
| 9 VCC | Bias supply output | 5.0V LDO output (4.75–5.25V) capable of sourcing up to 30mA for external logic or level-shifting. |
| 10 NC | No connect | Unused pin; must remain unconnected per datasheet - no tie-to-ground or pull-up required. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated inductor + MOSFETs | Eliminates 6–8 external components and reduces board area by >50% vs discrete buck solutions. |
| All-ceramic capacitor support | Enables use of low-ESR, high-reliability MLCCs instead of electrolytics - improves lifetime and temperature stability. |
| Prebias startup | Allows safe turn-on into precharged output rails - critical for hot-swap and multi-rail sequencing applications. |
| Hiccup overcurrent protection | Auto-retries after fault clears - prevents latch-up during short-circuit events in field-deployed equipment. |
| CISPR22 Class B compliance | Passes conducted/radiated emissions without external filter - accelerates EMC certification for industrial end products. |
Applications
| Industrial Sensors and Encoders | 4–20mA Current-Loop Powered Sensors |
|---|---|
Use Scenario: Powering rotary encoders and analog pressure transmitters in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 5V point-of-load regulator delivering clean, regulated power to sensor signal conditioning circuitry. Use Value: Maintains ±1.5% output accuracy over -40°C to +85°C ambient, ensuring consistent ADC reference and analog front-end performance. |
Use Scenario: Supplying 5V to loop-powered smart sensors operating from 4–20mA current source with limited headroom. IC Role / Device Role / Timing Role: Efficient step-down converter enabling full 5V rail generation from as low as 4.5V input - maximizing usable loop voltage. Use Value: 2.2μA shutdown current extends battery life in portable loop calibrators; PFM mode sustains efficiency down to 5mA load. |
| LDO Replacement | USB Type-C Powered Loads |
Use Scenario: Replacing inefficient linear regulators in space-constrained IoT gateways requiring 5V/300mA. IC Role / Device Role / Timing Role: High-efficiency switching alternative to 78L05-style LDOs - reducing thermal dissipation and PCB footprint. Use Value: Delivers >85% efficiency at 300mA (vs <40% for LDO at 12V→5V), eliminating need for heatsinks in sealed enclosures. |
Use Scenario: Regulating 5V power for USB-C peripheral controllers, PD sink ICs, and Type-C port logic in docking stations. IC Role / Device Role / Timing Role: Compact, certified-compliant 5V supply meeting USB-C specification ripple (<50mVpp) and transient response requirements. Use Value: Meets 10mV/div output ripple spec in PWM mode; load transient response settles within 100µs for 150mA→300mA steps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output DC-DC module applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAXM17904AMB+ | Fixed 3.3V output; identical package, pinout, and feature set except FB network internalized for 3.3V. | Suitable where system requires 3.3V logic rail instead of 5V - e.g., ARM Cortex-M microcontrollers or SPI peripherals. | Select MAXM17904AMB+ only when 3.3V output is required; not a drop-in replacement for 5V designs. |
| TSM10505S | 5V fixed output, 500mA rating, 3mm × 3mm × 1.5mm QFN; lacks integrated inductor and requires external compensation. | Used in cost-sensitive consumer applications where higher current and smaller solution size outweigh added design complexity. | Choose TSM10505S if >300mA load or lower BOM cost is prioritized over design simplicity and EMI certification time. |
Compared with MAXM17904AMB+, the MAXM17905AMB+ provides higher output voltage for legacy 5V peripherals, while TSM10505S trades integration for higher current and lower unit cost - making MAXM17905AMB+ optimal for rapid industrial design cycles requiring minimal validation.
Availability
MAXM17905AMB+ is available at Aetrix Electronics and suitable for industrial sensors and encoders, 4–20mA current-loop powered sensors, and USB Type-C powered loads requiring stable component supply, long-term lifecycle assurance, and full traceability.
Supply support for MAXM17905AMB+ 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 targets space-constrained, thermally demanding applications requiring plug-and-play DC-DC conversion with minimal external components.
FAQ
What is the maximum recommended output current for MAXM17905AMB+ at 85°C ambient?
The MAXM17905AMB+ delivers up to 300mA continuously at +85°C ambient when mounted on a four-layer PCB with standard copper pour. Derating begins above +85°C per the "Output Current vs. Ambient Temperature" curve (toc91), reaching ~220mA at +125°C ambient. Full 300mA is guaranteed at ≤+85°C with proper thermal layout.
Does MAXM17905AMB+ require an external feedback resistor divider?
No. The MAXM17905AMB+ is a fixed 5V output module - its feedback reference is internally trimmed to 5.00V ±1.5%. Pin 6 (FB) is internally connected and must remain unconnected externally. Adding external resistors would disrupt regulation and is not supported.
Can MAXM17905AMB+ be used with a prebiased output voltage?
Yes. The MAXM17905AMB+ supports prebias startup: it safely turns on even when the OUT pin is already biased to 5V. This avoids reverse current flow and enables reliable operation in hot-swap and multi-rail power-up sequencing scenarios - confirmed in typical operating waveforms (toc58, toc64).
What is the purpose of the VCC pin on MAXM17905AMB+?
The VCC pin on MAXM17905AMB+ is a 5.0V LDO output (4.75–5.25V) capable of sourcing up to 30mA. It powers internal circuitry and can supply external logic, level shifters, or supervisory ICs - eliminating need for a separate bias rail in compact designs.
How does the RESET pin behave during undervoltage conditions on MAXM17905AMB+?
The RESET pin on MAXM17905AMB+ goes low when FB falls below 92% of its regulation voltage (i.e., <4.6V for 5V output). It remains asserted until FB rises above 95.5% (≥4.775V) and then waits 1.9ms before releasing to high-impedance state - providing clean power-good signaling for system reset sequencing.
MAXM17905AMB+ 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:
- 5V
- 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:
- -
MAXM17905AMB+ FAQ
1.How can I place an order for MAXM17905AMB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAXM17905AMB+ 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 MAXM17905AMB+ reliable?
The price and inventory of MAXM17905AMB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAXM17905AMB+ is usually 5 days.
3.What payment methods are accepted for MAXM17905AMB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAXM17905AMB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAXM17905AMB+?
MAXM17905AMB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAXM17905AMB+ 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 MAXM17905AMB+?
For technical support, including MAXM17905AMB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAXM17905AMB+ requirements.
6.How does Aetrix verify that MAXM17905AMB+ is sourced from the original manufacturer or authorized distributors?
All MAXM17905AMB+ 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 MAXM17905AMB+ meets industry standards.
7.What is the process for return or replacement of MAXM17905AMB+?
All MAXM17905AMB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAXM17905AMB+, 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 MAXM17905AMB+ part is unused and in its original packaging.
Return procedure for MAXM17905AMB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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