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Analog Devices Inc./Maxim Integrated MAX17521ATG+
- Part No.:
- MAX17521ATG+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
MAX17521ATG+.pdf
- Description:
- IC REG BUCK ADJ 1A DL 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:601
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Product details
Overview
The MAX17521ATG+ from Maxim Integrated is a dual-output, synchronous step-down DC-DC converter with integrated high-side pMOS and low-side nMOS FETs, operating from 4.5V to 60V input and delivering up to 1A per output. It features ±1.7% feedback regulation accuracy over –40°C to +125°C, peak-current-mode control, and selectable 300kHz/560kHz switching frequency-used in industrial CPU/FPGA point-of-load power supplies.
For engineers reviewing the MAX17521ATG+ datasheet, MAX17521ATG+ pinout, MAX17521ATG+ application, or MAX17521ATG+ equivalent, key selection considerations include dual independent EN/UVLO and soft-start pins, hiccup-mode overload protection, ±1.7% VFB accuracy across temperature, and support for prebiased startup and output voltage tracking.
Technical Context
The MAX17521ATG+ implements peak-current-mode control with separate transconductance error amplifiers (GM = 590 µS typ) and current-sense transresistance (RCS = 0.5 Ω) per channel. Each output supports independent PWM or PFM operation via dedicated MODE pins, enabling light-load efficiency optimization without sacrificing regulation stability.
It integrates two 5V LDOs (VCC1/VCC2), dual open-drain RESET outputs with 92.5%/95.5% VOUT thresholds and 1024-cycle delay, and robust protection including cycle-by-cycle peak current limit (1.6A typ), runaway current limit (1.85A typ), thermal shutdown (165°C), and monotonic startup into prebiased loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 60V - supports wide industrial input rails including 24V and 48V systems without external pre-regulation. |
| Output Current per Channel | Up to 1A - sufficient for powering core logic of mid-tier FPGAs, DSPs, or microcontrollers. |
| Feedback Regulation Accuracy | ±1.7% over –40°C to +125°C - ensures stable output under full industrial ambient temperature range. |
| Switching Frequency | Selectable 300kHz or 560kHz - balances EMI, inductor size, and efficiency for specific layout constraints. |
| Peak Efficiency | >90% - reduces thermal load and improves system-level power density in compact designs. |
| Shutdown Current | 1µA - enables ultra-low-power standby modes in battery-backed or energy-sensitive applications. |
| Operating Junction Temp | –40°C to +150°C - validated for harsh environments including motor drives and factory automation. |
Pinout & Package
The MAX17521ATG+ is housed in a 24-pin, 4mm × 5mm TQFN package with exposed pad (EP) for thermal enhancement. Pin assignment follows dual-channel symmetry: channels 1 and 2 share identical functional pin layouts (VIN, EN/UVLO, FB, SS, COMP, RESET, MODE, LX, PGND, SGND, VCC), with FSEL and SYNC shared globally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PGND1 / PGND2 (Pins 1, 19) | Power ground return for each converter's high-current path | Must be connected externally to power ground plane; separate from analog ground to minimize noise coupling. |
| VIN1 / VIN2 (Pins 2, 18) | Main input supply for each converter | Accepts 4.5V–60V; requires local 2.2µF ceramic decoupling to respective PGND pin. |
| EN/UVLO1 / EN/UVLO2 (Pins 3, 17) | Enable and input undervoltage lockout input | Configurable turn-on threshold (1.215V typ rising); pull-up to VIN for always-on or resistive divider for programmable UVLO. |
| FB1 / FB2 (Pins 5, 15) | Output voltage feedback node | Connects to resistor divider; regulates output to 0.9V reference with ±1.7% accuracy over temperature. |
| SS1 / SS2 (Pins 6, 14) | Soft-start timing capacitor connection | Controls ramp rate of each output; also enables tracking (coincident/ratiometric) when tied to external supply. |
| RESET1 / RESET2 (Pins 9, 11) | Open-drain power-good monitor output | Asserts low if output falls below 92.5% VSET; releases high after 1024 cycles once >95.5% VSET. |
| MODE1 / MODE2 (Pins 23, 21) | PWM/PFM mode selection latch | Open = PFM (pulse-skipping, high light-load efficiency); grounded = PWM (constant frequency, lower ripple). |
| FSEL (Pin 10) | Global switching frequency select | Open = 560kHz; grounded = 300kHz - sets fSW for both converters simultaneously. |
| SYNC (Pin 22) | External clock synchronization input | Accepts 1.1× to 1.4× selected fSW; enables deterministic EMI reduction in multi-rail systems. |
| LX1 / LX2 (Pins 24, 20) | Switching node connection to inductor | High dv/dt node; requires tight layout with minimal loop area to reduce EMI and switching losses. |
| VCC1 / VCC2 (Pins 4, 16) | Integrated 5V LDO outputs | Power internal circuitry and gate drivers; bypass with 1µF ceramic to SGND; 40mA max source capability. |
| SGND1 / SGND2 (Pins 7, 13) | Analog ground reference for each channel | Separate from PGND; tie SGND and PGND together only at VCC bypass capacitor ground return. |
| COMP1 / COMP2 (Pins 8, 12) | Loop compensation network connection | Interface to RC network for stability tuning; transconductance amplifier GM = 590 µS typ per channel. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET integration | Eliminates external Schottky diode and reduces conduction loss - enables >90% peak efficiency at full load. |
| Dual independent soft-start and tracking | Enables coincident, ratiometric, or sequential power sequencing - critical for multi-rail SoC/FPGA startups. |
| Hiccup-mode overload protection | Shuts down switching for 4096 cycles on overcurrent or output collapse - limits power dissipation during sustained faults. |
| Prebiased output startup | Monotonic rise even when output capacitor is precharged - prevents reverse current and system instability. |
| Independent EN/UVLO and RESET per channel | Supports flexible power sequencing (e.g., daisy-chained EN→RESET) and fault-isolated monitoring in redundant supplies. |
Applications
| Industrial Control Power Supplies | CPU, DSP, or FPGA Power |
|---|---|
Use Scenario: Powering PLC I/O modules and fieldbus interface circuits in factory automation cabinets with 24V/48V DC rails. IC Role / Device Role / Timing Role: Dual-output buck regulator providing isolated 5V and 3.3V rails with independent sequencing and monitoring. Use Value: Wide 4.5V–60V input accommodates brownout and surge conditions; hiccup protection sustains operation during transient overloads. | Use Scenario: Supplying core and I/O voltages to Xilinx Artix-7 or Intel Cyclone V FPGAs in embedded vision systems. IC Role / Device Role / Timing Role: Point-of-load regulator delivering 1A at 1.2V (via external divider) and 3.3V with precise soft-start alignment. Use Value: ±1.7% VFB accuracy ensures reliable logic-level margin across –40°C to +125°C ambient; PFM mode extends battery life in portable variants. |
| Distributed Supply Regulation | General-Purpose Point of Load |
Use Scenario: Local regulation on PCBs with long power distribution traces, such as motor drive control boards with remote sensor interfaces. IC Role / Device Role / Timing Role: Step-down converter rejecting line ripple and compensating for IR drop using remote sense-capable feedback. Use Value: 560kHz option minimizes inductor size for space-constrained zones; all-ceramic design simplifies layout and improves reliability. | Use Scenario: General-purpose 5V/3.3V conversion for MCU-based edge nodes in IIoT gateways with mixed-signal peripherals. IC Role / Device Role / Timing Role: Dual-channel PMIC replacing discrete regulators to reduce BOM count and board area. Use Value: Pin-selectable frequency and independent MODE pins allow optimization for noise-sensitive analog sections vs. digital subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5143AQRHBTQ1 | Automotive-grade AEC-Q100 qualified; 65V max input; 3.5A per channel; no integrated low-side FET (external sync rectifier required). | Targeted at automotive ADAS and infotainment; lacks dual independent soft-start and RESET outputs. | Choose LM5143AQRHBTQ1 only when automotive qualification, higher current, or 65V input is mandatory - not a drop-in replacement. |
| TPS544B20RTWR | Single-channel, 4V–18.5V input; 4A output; uses D-CAP3 control; no PFM mode; smaller 3mm × 2mm QFN. | Optimized for server DDR memory rails; lacks dual output, wide input, or industrial temp rating. | Use TPS544B20RTWR for high-current single-rail applications where size and speed matter more than input range or redundancy. |
Compared with LM5143AQRHBTQ1 and TPS544B20RTWR, the MAX17521ATG+ uniquely delivers dual 1A outputs with independent sequencing, 60V input, industrial temperature range, and integrated FETs in a single 4mm × 5mm package - making it optimal for space- and reliability-constrained industrial multi-rail systems.
Availability
MAX17521ATG+ is available at Aetrix Electronics and suitable for industrial control power supplies, CPU/DSP/FPGA power, and distributed supply regulation requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX17521ATG+ 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 MAX17521ATG+ belongs to Maxim's high-voltage DC-DC regulator product line, engineered specifically for ruggedized point-of-load conversion in industrial automation, programmable logic controllers, and embedded computing where wide input range, dual-rail flexibility, and fault resilience are essential.
FAQ
What is the maximum input voltage supported by the MAX17521ATG+?
The MAX17521ATG+ supports an absolute maximum input voltage of 60V, with guaranteed operation from 4.5V to 60V. This wide range allows direct use with common industrial DC bus voltages including 24V and 48V systems, eliminating the need for pre-regulators in many applications. The device maintains ±1.7% output regulation accuracy across this full input range and over –40°C to +125°C ambient temperature.
Does the MAX17521ATG+ support independent enable and soft-start for each output?
Yes, the MAX17521ATG+ provides fully independent EN/UVLO1 and EN/UVLO2 pins, as well as separate SS1 and SS2 pins. This allows individual control of startup timing, programmable undervoltage thresholds, and implementation of coincident, ratiometric, or sequential voltage tracking - critical for powering complex SoCs and FPGAs with strict power sequencing requirements.
How does the MAX17521ATG+ handle overload or short-circuit conditions?
The MAX17521ATG+ employs dual-stage overcurrent protection: cycle-by-cycle peak current limiting (1.6A typ) and runaway current limiting (1.85A typ). When triggered, it enters hiccup mode - suspending switching for 4096 clock cycles before retrying soft-start. This limits average power dissipation during sustained faults while maintaining reliability in industrial environments where overloads may occur intermittently.
Can the MAX17521ATG+ operate with a prebiased output voltage?
Yes, the MAX17521ATG+ supports monotonic startup into prebiased outputs. During startup, both high-side and low-side switches remain off until the soft-start ramp reaches the prebias level, preventing reverse current flow and ensuring controlled voltage rise. This feature is essential for hot-swap applications and systems with backup capacitors or auxiliary power sources.
What are the thermal characteristics of the MAX17521ATG+ package?
The MAX17521ATG+ uses a 24-pin TQFN (4mm × 5mm) with exposed pad, offering θJA = 35°C/W and θJC = 1.8°C/W on a four-layer board. Its junction temperature is rated to +150°C, with thermal shutdown activating at +165°C and 10°C hysteresis. Proper thermal design - including soldering the EP to a large copper plane - is required to sustain 1A per channel at high ambient temperatures.
MAX17521ATG+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 55.2V
- Current - Output:
- 1A
- Frequency - Switching:
- 560kHz, 300kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (4x4)
MAX17521ATG+ FAQ
1.How can I place an order for MAX17521ATG+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17521ATG+ 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 MAX17521ATG+ reliable?
The price and inventory of MAX17521ATG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17521ATG+ is usually 5 days.
3.What payment methods are accepted for MAX17521ATG+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17521ATG+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17521ATG+?
MAX17521ATG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17521ATG+ 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 MAX17521ATG+?
For technical support, including MAX17521ATG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17521ATG+ requirements.
6.How does Aetrix verify that MAX17521ATG+ is sourced from the original manufacturer or authorized distributors?
All MAX17521ATG+ 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 MAX17521ATG+ meets industry standards.
7.What is the process for return or replacement of MAX17521ATG+?
All MAX17521ATG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17521ATG+, 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 MAX17521ATG+ part is unused and in its original packaging.
Return procedure for MAX17521ATG+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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