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Analog Devices Inc./Maxim Integrated MAX17501EATB+
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- Part No.:
- MAX17501EATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17501EATB+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
MAX17501EATB+ 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 - used for point-of-load regulation in industrial power supplies and battery-powered equipment.
For engineers reviewing the MAX17501EATB+ datasheet, MAX17501EATB+ pinout, MAX17501EATB+ application, or MAX17501EATB+ 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 open-drain RESET with 92.5%/95.5% VOUT trip points.
Technical Context
The MAX17501EATB+ employs peak-current-mode control with internal slope compensation and a transconductance error amplifier (GM = 590µS typ) to regulate output voltage via feedback at the FB/VO pin. It uses a fixed 3.3V output configuration with internal feedback divider and compensation, eliminating external resistors and capacitors for that variant.
Its control architecture supports both PFM (for >90% light-load efficiency) and forced-PWM operation, with hiccup-mode overcurrent protection triggered by either runaway current limit (780mA typ) or VOUT undervoltage (71.14% of nominal). Thermal shutdown activates at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial and battery-derived rails including 24V, 36V, and 48V systems. |
| Output Voltage | Fixed 3.3V ±1.7% - guaranteed accuracy across –40°C to +125°C ambient, enabling reliable logic supply without trimming. |
| Max Output Current | 500mA - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained designs. |
| Switching Frequency | 600kHz (typ) - enables use of small, low-profile inductors (e.g., ~2.2µH) and reduces output ripple without compromising EMI. |
| Peak Efficiency | >90% at full load - achieved via low RDS-ON high-side (0.85Ω typ) and low-side (0.35Ω typ) MOSFETs. |
| Shutdown Current | 0.9µA (typ) - minimizes standby power loss in always-on or battery-backed systems. |
| Soft-Start Time | Programmable via SS pin capacitor - prevents input inrush current during power-up; typical 1ms–10ms range with 3300pF. |
Pinout & Package
MAX17501EATB+ is housed in a 10-pin, 3mm × 2mm TDFN package with exposed pad (EP) connected to GND for thermal management. Pin 1 is PGND; pin 10 is LX; EP must be soldered to a large copper plane for optimal thermal performance (θJA = 67.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 PGND | Power Ground | Low-impedance return path for high-current LX switching node; must be tied to power ground plane and connected to GND at VCC bypass cap. |
| 2 VIN | Main Input Supply | Accepts 4.5V–60V; requires local 1µF ceramic decoupling; absolute max rating is +70V. |
| 3 EN/UVLO | Enable & Input Threshold Control | Resistor-divider 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 circuitry and low-side gate driver; UVLO trips at 3.7V falling. |
| 5 FB/VO | Feedback Input | Connected directly to 3.3V output; internal divider sets regulation point; bias current ≤17µA ensures minimal loading. |
| 6 SS | Soft-Start Timing | Capacitor-to-GND sets ramp time; 3300pF yields ~2.5ms typical soft-start; supports prebiased startup. |
| 7 N.C./COMP | No Connect (Fixed-Output Variant) | Not connected on MAX17501E; reserved for external compensation on adjustable-output versions (G/H). |
| 8 RESET | Open-Drain Power-Good | Asserts low when VOUT < 92.5%; releases high after 1024 cycles once VOUT > 95.5%; requires external pullup. |
| 9 GND | Analog Ground | Reference for FB, COMP, SS, RESET; separate from PGND but tied together at VCC bypass capacitor. |
| 10 LX | Switching Node | Connects to inductor switch node; high-impedance in shutdown; handles ±1.6A RMS current. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | On-chip 0.85Ω pMOS high-side and 0.35Ω nMOS low-side eliminate external diodes and reduce BOM count and layout area. |
| PFM Light-Load Mode | Skips pulses below ~62.5mA load, reducing no-load switching current to <140µA (typ), extending battery life. |
| Hiccup-Mode Overcurrent Protection | Enters 32,768-cycle suspension on runaway current (780mA) or VOUT collapse (71.14%), limiting fault power dissipation. |
| Prebiased Output Startup | Prevents reverse current flow into powered outputs by holding both FETs off until PWM command initiates controlled ramp-up. |
| Industrial Temperature Rating | Full functionality from –40°C to +125°C ambient (junction up to +150°C), validated for harsh environments like HVAC and process control. |
Applications
| Industrial Process Control | HVAC and Building Control |
|---|---|
Use Scenario: Regulating 3.3V for PLC I/O modules and sensor signal conditioning circuits operating from 24V DC field buses. IC Role / Device Role / Timing Role: Primary point-of-load DC-DC regulator delivering stable 3.3V at up to 500mA with ±1.7% accuracy across temperature. Use Value: Eliminates need for external compensation or feedback resistors, reduces board area by 30% vs. discrete buck solutions, and maintains regulation during 24V bus dips to 18V. | Use Scenario: Powering wireless thermostat controllers and damper actuator drivers in commercial HVAC systems with 36V–48V DC distribution. IC Role / Device Role / Timing Role: High-voltage input buck converter providing isolated 3.3V logic rail with hiccup-mode fault protection during motor stall events. Use Value: Withstands 60V transients per IEC 61000-4-5, delivers >90% efficiency at 200mA load, and enables compact form factor due to 3mm × 2mm TDFN footprint. |
| Base Station & Telecom | Battery-Powered Equipment |
Use Scenario: Generating 3.3V for remote radio unit (RRU) monitoring microcontrollers and fronthaul interface ICs in 48V telecom infrastructure. IC Role / Device Role / Timing Role: Secondary regulated supply with RESET signal synchronized to FPGA configuration sequence. Use Value: RESET delay (1024 cycles ≈ 1.7ms at 600kHz) provides clean power-good assertion after regulation settles, avoiding premature system boot. | Use Scenario: Powering portable test instruments and handheld data loggers using Li-ion or 12V sealed lead-acid batteries. IC Role / Device Role / Timing Role: Main DC-DC regulator supporting wide input (10V–58V) and delivering low-noise 3.3V with PFM mode for extended runtime. Use Value: 0.9µA shutdown current preserves battery charge during storage; soft-start prevents inrush into large capacitive loads (e.g., LCD bias rails). |
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, 65V max input, 500mA, adjustable output only; requires external feedback resistors and compensation. | Designed for automotive infotainment and ADAS; lacks fixed 3.3V option and integrated compensation of MAX17501EATB+. | Select when AEC-Q100 qualification and higher input voltage margin (65V) are mandatory; accept added design complexity. |
| TPS54202DRCT | 4.5V–28V input, 2A output, 500kHz, adjustable-only; no PFM mode; higher quiescent current (25µA vs. 0.9µA). | Targeted at cost-sensitive consumer electronics; insufficient input voltage range for 48V industrial systems. | Choose only for lower-voltage (<28V), higher-current applications where MAX17501EATB+'s 60V capability is unnecessary. |
Compared with LM5164QDDARQ1 and TPS54202DRCT, the MAX17501EATB+ uniquely combines fixed 3.3V output, internal compensation, 60V input rating, and sub-1µA shutdown current - making it optimal for compact, high-reliability industrial point-of-load designs without automotive or high-current requirements.
Availability
MAX17501EATB+ is available at Aetrix Electronics and suitable for industrial process control, HVAC and building automation, and battery-powered instrumentation requiring stable component supply and long-term manufacturability.
Supply support for MAX17501EATB+ 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, communications, and computing markets.
The MAX17501 product line delivers ultra-small, high-efficiency synchronous buck regulators targeting space-constrained industrial and battery-powered applications needing wide-input, fixed-output, and robust fault protection.
FAQ
What is the output voltage tolerance of the MAX17501EATB+ over temperature?
The MAX17501EATB+ guarantees ±1.7% output voltage accuracy over the full –40°C to +125°C ambient operating temperature range. This specification is verified across production lots and includes initial tolerance, thermal drift, and line/load regulation effects - ensuring reliable 3.3V supply for sensitive digital logic without external trimming.
Does the MAX17501EATB+ support prebiased output startup?
Yes, the MAX17501EATB+ supports prebiased output startup. When enabled into a precharged output, both high-side and low-side MOSFETs remain off until the first PWM pulse commands switching, preventing reverse current flow and enabling safe hot-plug operation - a critical feature for systems with backup supplies or shared rails.
What is the function of the N.C./COMP pin on the MAX17501EATB+?
The N.C./COMP pin on the MAX17501EATB+ is a no-connect (N.C.) pin. It is reserved for external loop compensation on adjustable-output variants (MAX17501G/H) but must be left unconnected on the fixed-output MAX17501EATB+, as internal compensation is fully integrated for the 3.3V configuration.
How does the RESET pin on the MAX17501EATB+ behave during thermal shutdown?
During thermal shutdown, the RESET pin on the MAX17501EATB+ is actively driven low, signaling a system fault condition. RESET remains low until the junction temperature falls below the thermal hysteresis threshold (155°C), the device exits thermal shutdown, soft-start completes, and the output reaches 95.5% of 3.3V - at which point RESET releases high after 1024 clock cycles.
Can the MAX17501EATB+ operate from a 12V input while delivering 500mA at 3.3V?
Yes, the MAX17501EATB+ operates reliably from 12V input at full 500mA load. At VIN = 12V, typical efficiency exceeds 88% (per Figure 6), junction temperature rise remains within limits (θJA = 67.3°C/W), and output regulation stays within ±1.7% - confirmed by load transient testing showing <50mV undershoot during 0–500mA steps.
MAX17501EATB+ 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)
MAX17501EATB+ FAQ
1.How can I place an order for MAX17501EATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17501EATB+ 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 MAX17501EATB+ reliable?
The price and inventory of MAX17501EATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17501EATB+ is usually 5 days.
3.What payment methods are accepted for MAX17501EATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17501EATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17501EATB+?
MAX17501EATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17501EATB+ 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 MAX17501EATB+?
For technical support, including MAX17501EATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17501EATB+ requirements.
6.How does Aetrix verify that MAX17501EATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17501EATB+ 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 MAX17501EATB+ meets industry standards.
7.What is the process for return or replacement of MAX17501EATB+?
All MAX17501EATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17501EATB+, 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 MAX17501EATB+ part is unused and in its original packaging.
Return procedure for MAX17501EATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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