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Analog Devices Inc./Maxim Integrated MAX17501GATB+
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- Part No.:
- MAX17501GATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17501GATB+.pdf
- Description:
- IC REG BUCK ADJ 500MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,192
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Product details
Overview
MAX17501GATB+ 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% output voltage accuracy over –40°C to +125°C, and 600kHz switching frequency - used for point-of-load regulation in industrial power supplies and telecom equipment.
For engineers reviewing the MAX17501GATB+ datasheet, MAX17501GATB+ pinout, MAX17501GATB+ application, or MAX17501GATB+ equivalent, key selection criteria include its ultra-small 3mm × 2mm TDFN package, PFM light-load efficiency mode, programmable EN/UVLO threshold, soft-start control via external capacitor, and integrated open-drain RESET signal with 92.5% undervoltage trip.
Technical Context
The MAX17501GATB+ implements peak-current-mode control with internal transconductance error amplifier (GM = 590µS), slope compensation, and PWM comparator driving integrated MOSFETs. It operates with fixed 3.3V output (no external feedback divider required) and uses a 600kHz oscillator (±40kHz tolerance) with minimum on-time of 120ns and maximum duty cycle of 94%.
Protection architecture includes hiccup-mode current limiting triggered by either single-cycle runaway current limit (780mA typ) or sustained VOUT drop below 71.14% of nominal, thermal shutdown at 165°C with 10°C hysteresis, and built-in prebiased start-up behavior that prevents output sinking during power-up into an already-biased rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial and telecom input rails including 24V, 36V, 48V systems without external pre-regulation. |
| Output Voltage | Fixed 3.3V ±1.7% - guaranteed accuracy across full –40°C to +125°C ambient, eliminating need for external resistor network calibration. |
| Max Output Current | 500mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained embedded systems. |
| Switching Frequency | 600kHz (typ) - enables use of small external inductors (e.g., ~4.7µH) and ceramic output capacitors while maintaining EMI manageability. |
| Efficiency Peak | >90% at full load - achieved via low RDS(ON) integrated MOSFETs (0.85Ω high-side, 0.35Ω low-side at +25°C) and synchronous rectification. |
| Shutdown Current | 0.9µA (typ) - enables ultra-low-power standby in battery-backed or energy-harvesting applications. |
| Operating Temp Range | –40°C to +125°C ambient - qualified for harsh industrial environments including motor drives and outdoor telecom infrastructure. |
Pinout & Package
MAX17501GATB+ is housed in a 10-pin, 3mm × 2mm TDFN package with exposed pad (EP) connected to GND for thermal dissipation. Pin 1 is PGND; pin 10 is LX; EP must be soldered to a large copper pour for optimal thermal performance (θJA = 67.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | High-current return path for LX switch node; must be connected directly to power ground plane and tied to GND at VCC bypass capacitor. |
| 2 VIN | Main Input Supply | Accepts 4.5V–60V unregulated input; requires ≥1µF ceramic bypass capacitance close to pin. |
| 3 EN/UVLO | Enable / Input Undervoltage Lockout | Resistor-programmable turn-on threshold (1.218V rising); pull high to VIN for always-on operation. |
| 4 VCC | Internal 5V LDO Output | Bypass with 1µF ceramic to GND; powers internal logic and low-side gate driver; shuts down if VCC drops below 3.7V. |
| 5 FB/VO | Feedback Input | Internally connected to 3.3V reference; direct connection to output provides regulation without external resistors. |
| 6 SS | Soft-Start Control | Capacitor-to-GND sets ramp time; reduces inrush current and prevents output overshoot during startup. |
| 7 N.C./COMP | No Connect (Fixed-Output Version) | Not connected internally for MAX17501G; leave floating - no external compensation required. |
| 8 RESET | Open-Drain Power-Good Signal | Asserts low when VOUT falls below 92.5%; releases high after 1024 cycles once VOUT exceeds 95.5% - requires external pull-up. |
| 9 GND | Analog Ground | Reference for FB, COMP, SS, RESET; tie to PGND at single-point star ground near VCC capacitor. |
| 10 LX | Switching Node | Connects to inductor's switch-side terminal; high-impedance during shutdown; carries high di/dt - minimize trace length and loop area. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 0.85Ω pMOS high-side and 0.35Ω nMOS low-side switches eliminate external Schottky diode, reduce conduction loss, and improve full-load efficiency >90%. |
| PFM Light-Load Mode | Skips pulses below ~62.5mA load to maintain >80% efficiency at 1mA, reducing quiescent current to 0.9µA in shutdown and ~100µA in PFM idle. |
| Robust Fault Protection | Hiccup-mode current limiting (triggered by 780mA runaway limit or VOUT < 71.14%), thermal shutdown (165°C), and prebiased start-up prevent damage during overload, short-circuit, or hot-insertion scenarios. |
| Ultra-Compact Layout Support | 3mm × 2mm TDFN package with all-ceramic BOM (no electrolytics needed), enabling PCB footprints under 15mm² for complete 3.3V/500mA supply. |
| System-Level Monitoring | Integrated open-drain RESET with 92.5%/95.5% VOUT thresholds and 1024-cycle delay provides reliable power-good signaling for FPGA, MCU, or ASIC sequencing. |
Applications
| Industrial Process Control | HVAC and Building Control |
|---|---|
Use Scenario: Powering PLC I/O modules, analog sensor front-ends, and isolated RS-485 transceivers in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Primary 3.3V point-of-load regulator converting 24V DC bus to stable logic supply with hiccup protection against field-wiring faults. Use Value: ±1.7% output accuracy ensures ADC reference stability; 60V input withstands 48V surge transients per IEC 61000-4-5. |
Use Scenario: Supplying HVAC zone controllers, damper actuators, and wireless thermostat nodes operating from 24VAC-derived DC rails. IC Role / Device Role / Timing Role: Compact 3.3V regulator delivering 500mA to ARM Cortex-M microcontrollers and Zigbee/Thread radios with low-noise PFM operation during standby. Use Value: 0.9µA shutdown current extends battery life in wireless sensors; TDFN package fits tight enclosures behind wall plates. |
| Base Station & Telecom | Battery-Powered Equipment |
Use Scenario: Providing bias voltage to RF front-end ICs, clock buffers, and optical SFP+ module supervisors in remote radio units (RRUs). IC Role / Device Role / Timing Role: Secondary 3.3V supply derived from 48V backplane, featuring RESET monitoring for system health reporting and thermal shutdown for overtemperature derating. Use Value: 600kHz switching avoids interference with LTE/5G bands; 125°C junction rating supports sealed outdoor enclosures. |
Use Scenario: Regulating 3.3V for portable test equipment, handheld meters, and IoT edge devices powered by Li-ion or 9V alkaline batteries. IC Role / Device Role / Timing Role: Main system regulator supporting dynamic load steps from µA sleep to 500mA active mode, with soft-start preventing brownout during wake-up. Use Value: Prebiased start-up avoids reverse current flow into partially charged batteries; PFM mode maintains >85% efficiency at 100µA load. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QWRXMRQ1 | 4.5V–65V input, 3.3V fixed, 500mA, 600kHz, AEC-Q100 qualified; requires external feedback resistors even for fixed outputs. | Automotive-grade qualification (AEC-Q100 Grade 1); higher VIN max but lacks integrated EN/UVLO programming and RESET functionality. | Select LM5164QWRXMRQ1 only when automotive temperature range (–40°C to +125°C) and qualification are mandatory; MAX17501GATB+ offers simpler layout and lower BOM count for industrial use. |
| TPS54340DDAR | 3.5V–42V input, adjustable output (0.8V–36V), 3.5A, 300–2.5MHz programmable freq; no fixed 3.3V variant; larger SOIC-8 package. | Higher current capability and wider output adjustability; lacks hiccup-mode protection, RESET output, and PFM efficiency optimization. | Choose TPS54340DDAR when >500mA load or variable output voltage is required; MAX17501GATB+ delivers superior integration, smaller footprint, and better light-load efficiency for fixed 3.3V systems. |
Compared with LM5164QWRXMRQ1 and TPS54340DDAR, the MAX17501GATB+ provides the most compact, fully integrated 3.3V/500mA solution with factory-trimmed accuracy, built-in RESET, and optimized PFM behavior - reducing design time, component count, and PCB area without sacrificing ruggedness or thermal performance.
Availability
MAX17501GATB+ is available at Aetrix Electronics and suitable for industrial process control, HVAC systems, and telecom infrastructure requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17501GATB+ 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 MAX17501 product line delivers ultra-small, high-voltage synchronous buck regulators targeting space-constrained industrial and telecom point-of-load applications where input voltage range, thermal robustness, and integration density are critical.
FAQ
What is the output voltage tolerance of the MAX17501GATB+ over temperature?
The MAX17501GATB+ guarantees ±1.7% output voltage accuracy over the full –40°C to +125°C ambient operating temperature range. This specification is measured at the FB/VO pin and reflects total error including initial trim, line regulation, load regulation, and temperature drift - ensuring reliable 3.3V rail stability for sensitive digital loads without external trimming.
Does the MAX17501GATB+ require external feedback resistors for its 3.3V output?
No, the MAX17501GATB+ does not require external feedback resistors. It is a fixed-output variant with internal resistor divider and reference trimmed to deliver 3.3V ±1.7%. The FB/VO pin is internally connected to the 0.9V reference and must be directly tied to the output capacitor for regulation - simplifying layout and reducing BOM count.
How does the MAX17501GATB+ behave when starting into a prebiased output?
The MAX17501GATB+ supports prebiased start-up: both high-side and low-side MOSFETs remain off until the PWM comparator commands the first pulse, preventing reverse current flow from the precharged output rail. This eliminates potential damage to upstream sources and ensures smooth, controlled ramp-up of VOUT to 3.3V without undershoot or oscillation.
What protection features are integrated into the MAX17501GATB+?
The MAX17501GATB+ integrates hiccup-mode overcurrent protection (triggered by 780mA runaway limit or VOUT < 71.14%), thermal shutdown at 165°C with 10°C hysteresis, input undervoltage lockout (EN/UVLO), and output undervoltage monitoring via open-drain RESET. These features collectively safeguard against short circuits, overloads, overheating, and input brownouts without external components.
Can the MAX17501GATB+ operate with forced PWM instead of PFM mode?
No - the MAX17501GATB+ is a PFM-only variant (G version). Forced PWM operation is only available in the H version (MAX17501H). The G version automatically enters pulse-frequency modulation at light loads to maximize efficiency, skipping pulses below ~62.5mA and achieving <100µA no-load operating current - ideal for low-power industrial sensors and standby systems.
MAX17501GATB+ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 55.2V
- 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)
MAX17501GATB+ FAQ
1.How can I place an order for MAX17501GATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17501GATB+ 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 MAX17501GATB+ reliable?
The price and inventory of MAX17501GATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17501GATB+ is usually 5 days.
3.What payment methods are accepted for MAX17501GATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17501GATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17501GATB+?
MAX17501GATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17501GATB+ 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 MAX17501GATB+?
For technical support, including MAX17501GATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17501GATB+ requirements.
6.How does Aetrix verify that MAX17501GATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17501GATB+ 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 MAX17501GATB+ meets industry standards.
7.What is the process for return or replacement of MAX17501GATB+?
All MAX17501GATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17501GATB+, 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 MAX17501GATB+ part is unused and in its original packaging.
Return procedure for MAX17501GATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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