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Analog Devices Inc./Maxim Integrated MAX17501AATB+
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- Part No.:
- MAX17501AATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17501AATB+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
MAX17501AATB+ from Maxim Integrated is a 60V input, 500mA synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, fixed 3.3V output, ±1.7% regulation accuracy over –40°C to +125°C, and 600kHz switching frequency - deployed in industrial process control power rails requiring ultra-small footprint and high light-load efficiency.
For engineers reviewing the MAX17501AATB+ datasheet, MAX17501AATB+ pinout, MAX17501AATB+ application, or MAX17501AATB+ equivalent, key selection considerations include its PFM light-load operation, resistor-programmable EN/UVLO threshold, open-drain RESET with 1024-cycle delay, soft-start programmability via external capacitor, and TDFN-10 (3mm × 2mm) thermal performance validated to 150°C junction temperature.
Technical Context
The MAX17501AATB+ employs peak-current-mode control with internal slope compensation and a transconductance error amplifier (GM = 590µS typ), enabling stable regulation across wide input (4.5V–60V) and load (0–500mA) ranges. Its architecture integrates a 5V LDO (VCC) for gate drive and internal logic, with hiccup-mode overcurrent protection triggered by either runaway current limit (0.78A typ) or VOUT undervoltage (71.14% of nominal).
It operates in PFM mode at light loads (≤62.5mA typ), skipping pulses to achieve >90% peak efficiency and sub-1µA shutdown current (0.9µA typ), while maintaining fixed 600kHz PWM under forced-switching conditions for EMI-sensitive systems. The device supports prebiased startup and features adjustable soft-start via external SS capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - enables direct connection to 24V/48V industrial buses and battery stacks without pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.7% - guaranteed accuracy over full –40°C to +125°C ambient, eliminating need for external feedback resistors. |
| Max Output Current | 500mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained embedded systems. |
| Switching Frequency | 600kHz (typ) - allows use of compact 2.2µH–4.7µH inductors and reduces output ripple without increasing EMI filtering burden. |
| Efficiency Peak | >90% - achieved at mid-load with all-ceramic output capacitors, minimizing thermal rise in sealed enclosures. |
| Shutdown Current | 0.9µA (typ) - enables long-term battery backup operation in always-on monitoring nodes. |
| Thermal Shutdown | 165°C with 10°C hysteresis - protects against sustained overload while permitting brief transient overloads during startup. |
Pinout & Package
MAX17501AATB+ is housed in a 10-pin, 3mm × 2mm TDFN package with exposed pad (EP) connected to GND for enhanced thermal dissipation (θJA = 67.3°C/W). Pin functions are validated per Maxim's official pin description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | High-current return path for LX node; must be connected to dedicated power ground plane and tied to GND at VCC bypass capacitor. |
| 2 VIN | Main Input Supply | Accepts 4.5V–60V; requires ≥1µF ceramic input capacitance close to pin for stability and EMI suppression. |
| 3 EN/UVLO | Enable & Input Threshold Control | Resistor-divider programmable turn-on voltage (1.218V typ rising); pull to VIN for always-on operation. |
| 4 VCC | Internal 5V LDO Output | Powers internal circuitry and low-side gate driver; bypassed with 1µF ceramic to GND; UVLO disables if VCC < 3.7V. |
| 5 FB/VO | Feedback Input | Internally connected to 3.3V reference; directly tied to output for fixed-output variants - no external divider needed. |
| 6 SS | Soft-Start Timing | Capacitor-to-GND sets ramp time; prevents input inrush and output overshoot during power-up. |
| 7 N.C./COMP | No Connect (Fixed Output) | Not connected on MAX17501A; reserved for external compensation only on adjustable versions (G/H). |
| 8 RESET | Open-Drain Power-Good | Asserts low when VOUT drops below 92.5%; rises after 1024 cycles once VOUT exceeds 95.5% - requires external pullup. |
| 9 GND | Analog Ground | Reference for FB, COMP, SS, RESET; separated from PGND but joined at VCC bypass capacitor ground node. |
| 10 LX | Switching Node | Connects to inductor switch node; high-impedance in shutdown; handles ±1.6A RMS current during operation. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | On-chip 0.85Ω high-side pMOS and 0.35Ω low-side nMOS eliminate external Schottky diode and reduce BOM count and layout area. |
| PFM Light-Load Efficiency | Skips switching cycles below 62.5mA load, reducing quiescent current to ~100µA and extending battery life in intermittent-sensing applications. |
| Robust Fault Protection | Hiccup-mode response to overcurrent (0.78A runaway limit), thermal shutdown (165°C), and output undervoltage (71.14% trip) minimizes stress during fault conditions. |
| Prebiased Startup Support | Prevents reverse current flow into powered outputs - critical for hot-swap and redundant supply systems where VOUT may be precharged. |
| Industrial Temperature Rating | Specified for continuous operation from –40°C to +125°C ambient (junction up to +150°C), qualifying for harsh environments like factory automation and outdoor telecom. |
Applications
| Industrial Process Control | HVAC and Building Control |
|---|---|
Use Scenario: Powering 4–20mA loop transmitters and isolated ADCs in PLC I/O modules exposed to 24VDC field wiring with surge transients. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting unregulated 24V/48V bus to clean 3.3V for analog front-end and MCU core logic. Use Value: 60V absolute max rating withstands 48V bus transients; hiccup-mode protection sustains operation during sensor short-circuits without latch-off. | Use Scenario: Supplying wireless thermostat controllers and damper actuator drivers mounted in HVAC ducts with wide ambient temperature swings. IC Role / Device Role / Timing Role: Compact 3.3V rail generator supporting low-power BLE/Wi-Fi SoCs and precision temperature/humidity sensors. Use Value: PFM mode extends battery life in battery-backed units; TDFN-10 footprint fits tight PCB real estate behind display bezels. |
| Base Station & Telecom | Battery-Powered Equipment |
Use Scenario: Providing auxiliary 3.3V bias for optical SFP modules and clock buffers in remote radio heads operating from -48V DC plant power. IC Role / Device Role / Timing Role: Intermediate buck stage stepping down from intermediate 12V rail to noise-sensitive 3.3V data-path supplies. Use Value: 600kHz fixed-frequency operation simplifies EMI filter design; RESET signal synchronizes FPGA configuration sequencing. | Use Scenario: Regulating power for portable gas detectors and handheld test meters using Li-ion or alkaline primary cells. IC Role / Device Role / Timing Role: Main system regulator delivering 3.3V to MCU, display, and sensing circuitry from variable battery input (6V–36V). Use Value: 0.9µA shutdown current preserves shelf life; wide VIN range eliminates need for separate boost/buck converters across battery chemistries. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDDARQ1 | Automotive-grade AEC-Q100, 100V max input, 3.5A output, 400kHz switching - larger package (SO PowerPAD), higher current capability. | Targeted for automotive infotainment and ADAS power rails; not qualified for industrial temp range. | Select when 100V input tolerance or AEC-Q100 compliance is mandatory; avoid if board space or cost sensitivity favors MAX17501AATB+. |
| TPS54202DRCT | 4.5V–28V input, 2A output, 500kHz, integrated compensation - smaller 10-pin WSON but lower voltage rating and no PFM mode. | Optimized for consumer electronics and computing; lacks hiccup-mode protection and industrial temperature support. | Choose for cost-sensitive 24V systems with moderate load demands; not suitable for 48V industrial or high-reliability applications. |
Compared with LM5164QDDARQ1 and TPS54202DRCT, the MAX17501AATB+ delivers optimal balance of ultra-small size, 60V industrial input resilience, PFM efficiency at microamp loads, and robust hiccup-mode fault handling - making it preferred for space-constrained, wide-input industrial and telecom point-of-load designs.
Availability
MAX17501AATB+ is available at Aetrix Electronics and suitable for industrial process control, HVAC and building control, and battery-powered equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX17501AATB+ 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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.
The MAX17501 product line delivers ultra-small, high-efficiency synchronous buck regulators targeting space- and reliability-critical industrial point-of-load applications with wide input voltage and extended temperature requirements.
FAQ
What is the output voltage tolerance of the MAX17501AATB+ over temperature?
The MAX17501AATB+ maintains ±1.7% output voltage accuracy over the full –40°C to +125°C ambient temperature range. This specification is guaranteed by design and characterization, not just tested at +25°C, ensuring reliable 3.3V regulation in demanding industrial environments where thermal drift could otherwise compromise sensor or communication IC performance. The MAX17501AATB+ achieves this via precision internal feedback reference and trimmed error amplifier.
Does the MAX17501AATB+ support prebiased output startup?
Yes, the MAX17501AATB+ supports prebiased output startup. When enabled into a precharged output, both high-side and low-side switches remain off until the PWM comparator commands the first pulse, preventing reverse current flow from the output into the regulator. This behavior is confirmed in the Detailed Description section of the datasheet and is essential for hot-swap applications and systems with redundant power paths where the MAX17501AATB+ may power up into an already-active rail.
What is the purpose of the N.C./COMP pin on the MAX17501AATB+?
The N.C./COMP pin (Pin 7) on the MAX17501AATB+ is a no-connect terminal because this variant has a fixed 3.3V output and uses internal compensation. It must be left unconnected - unlike adjustable versions (e.g., MAX17501G/H), which require an external RC network on this pin for loop stability. Connecting any component to Pin 7 on the MAX17501AATB+ risks instability or malfunction, as confirmed in the Pin Description table and Block Diagram.
How does the RESET function behave during thermal shutdown on the MAX17501AATB+?
During thermal shutdown, the MAX17501AATB+ asserts the open-drain RESET pin low - identical to its behavior during output undervoltage. This provides a unified fault indicator for both thermal and regulation failures. RESET remains low throughout the thermal shutdown event and only returns high-impedance after the junction cools by 10°C and soft-start successfully re-establishes regulation, with the 1024-cycle delay applied upon recovery. This behavior is explicitly documented in the RESET Output section of the datasheet.
Can the MAX17501AATB+ operate with all-ceramic output capacitors?
Yes, the MAX17501AATB+ is fully compatible with all-ceramic output capacitors - a key design feature highlighted in the Benefits and Features section. Its internal compensation and peak-current-mode control ensure stability with low-ESR ceramic types (e.g., X7R, X5R), enabling ultra-compact layouts without electrolytic bulk capacitors. Typical designs use 10µF–22µF ceramic output caps, verified in evaluation circuits and typical operating characteristics plots.
MAX17501AATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x2)
MAX17501AATB+ FAQ
1.How can I place an order for MAX17501AATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17501AATB+ 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 MAX17501AATB+ reliable?
The price and inventory of MAX17501AATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17501AATB+ is usually 5 days.
3.What payment methods are accepted for MAX17501AATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17501AATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17501AATB+?
MAX17501AATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17501AATB+ 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 MAX17501AATB+?
For technical support, including MAX17501AATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17501AATB+ requirements.
6.How does Aetrix verify that MAX17501AATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17501AATB+ 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 MAX17501AATB+ meets industry standards.
7.What is the process for return or replacement of MAX17501AATB+?
All MAX17501AATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17501AATB+, 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 MAX17501AATB+ part is unused and in its original packaging.
Return procedure for MAX17501AATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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