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Analog Devices Inc./Maxim Integrated MAX17531ATB+T
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- Part No.:
- MAX17531ATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17531ATB+T.pdf
- Description:
- IC REG BUCK ADJ 50MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,455
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Product details
Overview
MAX17531ATB+T from Maxim Integrated is a high-voltage, synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4V to 42V input and delivering up to 50mA output current. It supports adjustable output voltages from 0.8V to 0.9 × VIN, achieves ±1.75% FB voltage accuracy over –40°C to +125°C, and features peak-current-mode control with selectable PWM or PFM operation-ideal for industrial sensor power rails and battery-powered equipment requiring ultra-low quiescent current.
For engineers reviewing the MAX17531ATB+T datasheet, MAX17531ATB+T pinout, MAX17531ATB+T application, or MAX17531ATB+T equivalent, key selection considerations include its 22µA no-load supply current in PFM mode, 100kHz–2.2MHz programmable switching frequency via RT/SYNC resistor, monotonic startup into prebiased loads, and integrated RESET monitoring with 2ms delay-critical for reliable power sequencing in harsh industrial environments.
Technical Context
The MAX17531ATB+T implements an internally compensated peak-current-mode architecture with dual-MOSFET integration (2.7Ω high-side pMOS, 1.25Ω low-side nMOS), enabling stable regulation without external compensation components. Its adaptive loop compensation automatically adjusts across the full 100kHz–2.2MHz switching frequency range, excluding disallowed bands (130–160kHz, 230–280kHz) to maintain stability.
Control logic includes dedicated MODE pin selection between forced-PWM (GND) and automatic PFM (open), where PFM disables negative inductor current and skips pulses below ~39mA load to achieve >90% peak efficiency and 22µA quiescent current. EN/UVLO supports programmable undervoltage lockout with 1.25V rising threshold and 1.15V falling threshold, while RESET provides open-drain fault signaling with 92% falling and 95% rising thresholds referenced to VFB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 42V - enables direct replacement of high-voltage LDOs in industrial sensors and HVAC systems without intermediate buck stages. |
| Output Current Capability | Up to 50mA - sufficient for powering microcontrollers, analog front-ends, and isolated gate drivers in compact embedded systems. |
| No-Load Supply Current | 22µA in PFM mode - extends battery life in always-on remote sensors and portable instrumentation. |
| Feedback Voltage Accuracy | ±1.75% over –40°C to +125°C - ensures stable 3.3V or 5V rail regulation across full industrial temperature range without calibration. |
| Switching Frequency Range | 100kHz to 2.2MHz (programmable via RT resistor) - allows EMI optimization and inductor size reduction while avoiding prohibited frequency bands for loop stability. |
| Quiescent Shutdown Current | 1.2µA max - minimizes system standby power loss when disabled via EN/UVLO pin. |
| Thermal Protection | 160°C junction shutdown with 20°C hysteresis - prevents thermal runaway during overload or poor PCB heatsinking conditions. |
Pinout & Package
MAX17531ATB+T is packaged in a 10-pin TDFN (3mm × 2mm) with exposed pad, designated by package code T1032N+1 per Maxim's outline 21-0429. This ultra-small footprint supports high-density industrial PCB layouts while providing low thermal resistance (θJA = 67.3°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power input | Bypassed with 1µF X7R ceramic capacitor; withstands 48V absolute max - accommodates transient surges in 24V/36V industrial buses. |
| EN/UVLO | Enable & input UVLO control | Active-high logic with 1.25V rising threshold; resistor-divider programmable - enables custom brown-out protection for system-level power sequencing. |
| RT/SYNC | Oscillator timing & sync input | Accepts resistor for frequency setting (100kHz–2.2MHz) or AC-coupled external clock (PWM mode only) - supports deterministic EMI reduction in synchronized multi-rail systems. |
| SS | Soft-start control | Internal 5.1ms soft-start when unconnected; external capacitor enables user-defined ramp time - ensures monotonic startup into prebiased outputs without reverse current. |
| FB | Output voltage feedback | 0.8V reference with ±1.75% tolerance; connects to resistor divider from VOUT - eliminates need for precision external references in cost-sensitive designs. |
| VOUT | External bias supply | Connects to output rail (3.3V–5V) via RC network to reduce IN current draw - improves overall efficiency by powering internal circuitry from regulated output. |
| RESET | Open-drain power-good monitor | Pulls low when FB drops below 92% of setpoint; 2ms delay before asserting high - provides clean reset signal for microcontrollers and FPGAs. |
| MODE | PFM/PWM selection | Open = automatic PFM at light loads; GND = forced PWM - allows trade-off between light-load efficiency and fixed-frequency EMI control. |
| GND | Power ground | Single-point connection point for all grounds; EP tied to GND - critical for noise immunity and thermal performance in high-voltage switching applications. |
| LX | Switch node | Drives external inductor; high-impedance in shutdown - requires careful layout to minimize ringing and EMI in high-dV/dt switching node. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-MOSFET power stage | 2.7Ω high-side pMOS + 1.25Ω low-side nMOS - eliminates external FETs and gate drivers, reducing BOM count and layout area in space-constrained modules. |
| Programmable switching frequency | 100kHz–2.2MHz via single RT resistor - enables optimization for size (high-freq), efficiency (mid-freq), or EMI (low-freq) without changing IC or controller. |
| Internal soft-start & monotonic startup | Fixed 5.1ms internal ramp or user-defined via SS capacitor - prevents output overshoot and reverse current when powering precharged rails like FPGA I/O banks. |
| Open-drain RESET with hysteresis | 92% falling / 95% rising thresholds with 2ms delay - delivers glitch-free power-good signaling compatible with standard µC reset inputs. |
| Wide industrial temperature range | –40°C to +125°C ambient (–40°C to +150°C junction) - qualified for deployment in uncontrolled environments such as factory floors, outdoor enclosures, and automotive under-hood zones. |
| All-ceramic capacitor support | No electrolytic or tantalum required - enables fully MLCC-based design for improved reliability, lifetime, and temperature stability in harsh thermal cycling applications. |
Applications
| Industrial Sensor Power Supply | High-Voltage LDO Replacement |
|---|---|
Use Scenario: Powering 4–20mA loop transmitters, RTD interfaces, and MEMS pressure sensors in factory automation systems with 24V or 36V bus supplies. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V or 5V rail from unregulated industrial bus; provides RESET signal for sensor self-test sequencing. Use Value: Replaces inefficient 78L05-style LDOs, cutting power dissipation by >75% and enabling smaller heatsinks or sealed enclosures. | Use Scenario: Replacing discrete high-voltage LDO solutions in building HVAC controllers where input voltage varies from 12V to 42V due to battery backup or rectified AC. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering regulated 3.3V for MCU, display, and communication ICs; uses EN/UVLO for brown-out detection during AC line dips. Use Value: Achieves >90% efficiency at 50mA vs. <40% for LDOs, eliminating thermal derating concerns and enabling fanless operation. |
| Battery-Powered Remote Monitor | HVAC Zone Controller |
Use Scenario: Long-life wireless sensor node powered by two LiSOCl₂ cells (6.8V–7.2V), requiring ultra-low quiescent current and regulated 3.3V for RF transceiver and ADC. IC Role / Device Role / Timing Role: Always-on buck regulator operating in PFM mode; leverages 22µA no-load IQ and 1.2µA shutdown to maximize battery service life. Use Value: Extends operational lifetime from months to >10 years by minimizing standby current while maintaining fast wake-up response. | Use Scenario: Distributed zone controller in commercial HVAC systems, receiving 24VAC via transformer and rectifying to 34VDC for local regulation. IC Role / Device Role / Timing Role: Input-tolerant DC-DC stage converting rectified 34VDC to 5V for microcontroller, relay drivers, and environmental sensors; uses RESET for firmware watchdog coordination. Use Value: Eliminates need for bulky input filter capacitors and linear regulators, reducing board area by 40% and improving surge immunity. |
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, 3–65V input, 300mA output, requires external compensation | Higher current, wider VIN, but larger solution size and higher IQ (45µA) | Select for automotive under-hood use or >50mA loads; avoid if board space or ultra-low IQ are critical. |
| TPS54202DRCT | 2.9–17V input, 2A output, integrated compensation, 45µA IQ, 6-pin SOT-23 | Narrower input range, much higher current, lower voltage rating - unsuitable for 24V+ industrial inputs | Choose only for low-voltage (<17V), high-current applications; not a functional substitute for MAX17531ATB+T's 4–42V range. |
Compared with LM5164QDDARQ1 and TPS54202DRCT, the MAX17531ATB+T uniquely balances ultra-wide 4–42V input, 50mA capability, 22µA PFM IQ, and TDFN packaging - making it optimal for compact, battery- or industrial-bus-powered nodes where efficiency, size, and temperature resilience outweigh raw current capacity.
Availability
MAX17531ATB+T is available at Aetrix Electronics and suitable for industrial sensors and process control, battery-powered equipment, and HVAC and building control systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX17531ATB+T 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, communications, and consumer applications.
The MAX17531ATB+T belongs to Maxim's ultra-small, high-efficiency DC-DC converter product line, engineered specifically for space-constrained industrial and battery-powered systems needing wide-input, low-IQ, and robust thermal performance.
FAQ
What is the maximum output current capability of the MAX17531ATB+T?
The MAX17531ATB+T delivers up to 50mA of continuous output current. This rating is maintained across its full 4V to 42V input range and –40°C to +125°C operating temperature. Peak current limit is internally set to 110mA (typ), ensuring safe operation under transient overloads without external current-sense resistors. The device sustains this output level with >90% peak efficiency using appropriate external components (e.g., 330µH inductor, 10µF X7R output capacitor).
Does the MAX17531ATB+T require external compensation components?
No, the MAX17531ATB+T features internal compensation optimized for its peak-current-mode architecture. It supports stable operation across the full 0.8V to 0.9 × VIN output range and 100kHz to 2.2MHz switching frequency without external compensation networks. This eliminates the need for type-II or type-III compensation circuits, reducing design complexity and component count while maintaining phase margin >57° as verified in typical application circuits.
How does the MODE pin affect efficiency and switching behavior in the MAX17531ATB+T?
When the MODE pin is left unconnected, the MAX17531ATB+T operates in PFM mode at light loads (<39mA), skipping pulses to achieve 22µA no-load supply current and >85% efficiency at 1mA. When MODE is grounded, it forces constant-frequency PWM operation at all loads, enabling predictable EMI but increasing no-load IQ to ~180µA. The mode cannot be changed dynamically during operation - selection is static at power-up.
Can the MAX17531ATB+T start up into a prebiased output voltage?
Yes, the MAX17531ATB+T supports monotonic startup into prebiased outputs. During initial enable, both high-side and low-side MOSFETs remain off until the internal error amplifier commands the first PWM pulse, preventing reverse current flow from the precharged output rail. This feature is essential for powering multi-rail digital systems (e.g., FPGAs) where auxiliary supplies may already be active before the MAX17531ATB+T is enabled.
What is the purpose of the VOUT pin on the MAX17531ATB+T, and how should it be connected?
The VOUT pin on the MAX17531ATB+T provides an external bias path for internal circuitry. For output voltages between 3.3V and 5V, it must be decoupled to GND with a 0.22µF ceramic capacitor and connected to the output capacitor's positive terminal via a 22.1Ω resistor (R4) and 0.22µF capacitor (C1) to prevent exceeding its –0.3V absolute minimum rating during short-circuit events. For outputs <3.3V or >5V, VOUT is connected directly to GND.
MAX17531ATB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 37.8V
- Current - Output:
- 50mA
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x2)
MAX17531ATB+T FAQ
1.How can I place an order for MAX17531ATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17531ATB+T 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 MAX17531ATB+T reliable?
The price and inventory of MAX17531ATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17531ATB+T is usually 5 days.
3.What payment methods are accepted for MAX17531ATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17531ATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17531ATB+T?
MAX17531ATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17531ATB+T 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 MAX17531ATB+T?
For technical support, including MAX17531ATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17531ATB+T requirements.
6.How does Aetrix verify that MAX17531ATB+T is sourced from the original manufacturer or authorized distributors?
All MAX17531ATB+T 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 MAX17531ATB+T meets industry standards.
7.What is the process for return or replacement of MAX17531ATB+T?
All MAX17531ATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17531ATB+T, 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 MAX17531ATB+T part is unused and in its original packaging.
Return procedure for MAX17531ATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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