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Analog Devices Inc./Maxim Integrated MAX17546ATP+T
- Part No.:
- MAX17546ATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17546ATP+T.pdf
- Description:
- IC REG BUCK ADJ 5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,062
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Product details
Overview
MAX17546ATP+T from Maxim Integrated is a high-voltage synchronous step-down DC-DC converter with integrated high-side MOSFET, delivering up to 5A output current across a 4.5V–42V input range and supporting adjustable output voltages from 0.9V to 90% of VIN. It features peak current-mode control, ±1.4% FB regulation accuracy over –40°C to +125°C, and internal compensation eliminating external loop components. It is deployed in industrial power supplies where wide-input, high-efficiency, and robust thermal performance are required.
For engineers reviewing the MAX17546ATP+T datasheet, MAX17546ATP+T pinout, MAX17546ATP+T application, or MAX17546ATP+T equivalent, key selection considerations include its 5A continuous output capability, programmable 100kHz–2.2MHz switching frequency via RT resistor, PFM/DCM/PWM mode flexibility, 3.5µA shutdown current, and built-in RESET with voltage monitoring - all in a thermally enhanced 20-pin 5mm × 5mm TQFN package.
Technical Context
The MAX17546ATP+T implements peak current-mode control with an internal transconductance error amplifier, slope compensation generator, and PWM comparator. Its architecture supports three distinct operating modes-PWM (constant-frequency, negative inductor current allowed), PFM (pulse-skipping, 2A fixed peak current at light loads), and DCM (constant-frequency with zero-current detection)-each selected at power-up via the MODE/SYNC pin state.
It integrates dual LDOs for VCC generation: one powered from VIN (INLDO) and another from EXTVCC (EXTVCC LDO), with automatic switchover at 4.56V–4.84V. The device includes DL-to-LX short detection, hiccup-mode overload protection, monotonic startup into prebiased loads, and auxiliary bootstrap LDO for improved efficiency at high VIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - enables direct regulation from 12V, 24V, 36V, and 48V industrial bus rails without pre-regulation. |
| Output Current | 5A continuous - supports high-power point-of-load conversion for FPGAs, ASICs, and DSPs in single-board systems. |
| Feedback Accuracy | ±1.4% over –40°C to +125°C - ensures stable output regulation across full industrial ambient temperature range. |
| Switching Frequency | 100kHz to 2.2MHz (adjustable via RT resistor) - allows EMI optimization and inductor size reduction while maintaining compatibility with external clock synchronization. |
| Shutdown Current | 3.5µA - minimizes system standby power loss in battery-backed or energy-sensitive applications. |
| Efficiency Peak | >95% - achieved under typical 5V/5A load conditions at 24V input, reducing thermal load and enabling compact PCB layouts. |
| Operating Temp Range | –40°C to +125°C ambient / –40°C to +150°C junction - qualified for harsh industrial and base-station environments. |
Pinout & Package
MAX17546ATP+T is housed in a 20-pin, 5mm × 5mm thin QFN with exposed pad (TQFN-EP, package code T2055+4). Thermal resistance θJA = 23°C/W (four-layer board), and the EP must be soldered to SGND with multiple thermal vias for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,14,15 VIN | Power input supply | Four parallel pins reduce IR drop and improve thermal dissipation; require local 2×2.2µF ceramic decoupling to PGND. |
| 3 PGND | Power ground return | Low-impedance path for high di/dt LX current; must be connected to power-ground plane and tied to SGND at VCC bypass capacitor. |
| 4 VCC | Internal 5V LDO output | Supplies internal logic and low-side gate driver; requires 2.2µF ceramic bypass to SGND; UVLO threshold 3.8V–4.2V. |
| 5 MODE/SYNC | Mode selection & sync input | Configures PWM (GND), DCM (VCC), or PFM (open); also accepts external clock up to 2.2MHz for EMI control. |
| 6 RESET | Open-drain fault indicator | Asserts low when FB falls below 92.5% of setpoint; deasserts after 1024 cycles once FB rises above 95.5% - enables system-level power sequencing. |
| 7 RT | Frequency programming | Resistor-to-SGND sets fSW; open = 450kHz default; equation fSW(kHz) ≈ 1.7×10³/RRT(kΩ) enables precise EMI tuning. |
| 8 SGND | Analog reference ground | Separate from PGND to minimize noise coupling into FB, CF, and SS; tie to PGND only at VCC bypass cap. |
| 9 CF | Compensation node | Required only for fSW < 450kHz; connects to FB to stabilize loop with internal compensation network. |
| 10 FB | Voltage feedback input | Connects to resistor divider from VOUT; 0.9V reference enables output setting from 0.9V to 0.9×VIN with ±1.4% tolerance. |
| 11 EXTVCC | External VCC supply input | Accepts 4.84V–24V to power VCC from output rail, improving efficiency at high VIN; requires 4.7Ω/0.1µF RC filter. |
| 12 SS | Soft-start timing | Capacitor-to-SGND sets ramp time; enables monotonic startup into prebiased outputs without reverse current. |
| 13 EN/UVLO | Enable & input UVLO | 1.215V rising threshold (±2.5%); resistor divider from VIN sets turn-on voltage; pull to VIN for always-on operation. |
| 16 BST | Bootstrap capacitor node | Connects 0.1µF ceramic between BST and LX to drive high-side MOSFET gate above VIN during conduction. |
| 17,18,19 LX | Switching node | Three parallel pins handle high di/dt; connect directly to inductor switch node; critical for EMI and thermal layout. |
| 20 DL | Low-side gate driver output | Drives external n-MOSFET gate; resistor to SGND selects current-limit thresholds (6.5A–9.1A peak) and hiccup behavior. |
Key Features
| Feature | Design Value |
|---|---|
| No external compensation required | Internal Type-II compensation eliminates need for external RC networks - reduces BOM count and layout sensitivity across full output voltage range. |
| Programmable switching frequency | 100kHz–2.2MHz via single RT resistor - enables optimal trade-off between efficiency, size, and EMI compliance without changing IC. |
| Three selectable operating modes | PWM (constant frequency), PFM (light-load pulse skipping), DCM (light-load zero-current detection) - maximizes efficiency across full load range. |
| Built-in RESET with hysteresis | Monitors FB voltage; asserts low at 92.5% of setpoint, releases after 1024 cycles at 95.5% - provides reliable power-good signaling for downstream logic. |
| Auxiliary EXTVCC LDO | Accepts 4.84V–24V input to power VCC from output rail - improves efficiency by ~2–3% at high VIN (e.g., 36V→5V) versus VIN-powered VCC. |
| Hiccup-mode overload protection | Detects overcurrent via DL pin; enters timed hiccup (32768-cycle timeout) instead of latch-off - enables self-recovery after transient faults. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Central 24V/48V bus powering multiple isolated or non-isolated DC-DC stages in PLCs, motor drives, and I/O modules. IC Role / Device Role / Timing Role: Primary non-isolated buck regulator delivering 5V/3.3V to microcontrollers, sensors, and communication interfaces. Use Value: 42V max input withstands 48V transients per IEC 61000-4-5; 5A output supports multi-rail SoC subsystems without parallel converters. |
Use Scenario: Local regulation on dense PCBs where space-constrained point-of-load conversion is needed near FPGAs or ADCs. IC Role / Device Role / Timing Role: High-efficiency synchronous buck converter generating clean 1.2V/1.8V/3.3V from intermediate 12V rail. Use Value: Internal compensation and all-ceramic capacitor support enable <10mm² layout; 95%+ peak efficiency reduces localized heating. |
| Base-Station Power Supplies | High-Voltage Single-Board Systems |
|
Use Scenario: Telecom equipment requiring reliable 5V/12V rails from -48V nominal input with high MTBF and thermal resilience. IC Role / Device Role / Timing Role: Input-stage buck converter stepping -48V (with polarity inversion) or 48V to intermediate 12V for downstream POLs. Use Value: –40°C to +125°C operation and hiccup-mode protection ensure uptime in uncooled outdoor cabinets; 42V rating covers surge margins. |
Use Scenario: Embedded computing platforms (e.g., COM Express, SMARC) integrating CPU, memory, and peripherals on single high-voltage board. IC Role / Device Role / Timing Role: Main system regulator converting 24V/36V input to 5V/3.3V for SoM power domains and peripheral interfaces. Use Value: Monotonic startup into prebiased loads prevents bus contention; RESET output coordinates FPGA configuration sequencing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 3.5A output, no internal high-side MOSFET (external FET required), no integrated EXTVCC LDO. | Requires external high-side MOSFET and gate driver; better suited for ultra-high-input designs beyond 42V but adds complexity and BOM cost. | Select LM5164QPWPRQ1 only if input exceeds 42V or higher voltage margin is mandatory; MAX17546ATP+T offers lower system cost and smaller footprint for ≤42V inputs. |
| TPS54560BQDDARQ1 | 3.5V–60V input, 5A output, no internal compensation, requires external RC compensation network, no PFM/DCM modes. | Lacks internal loop compensation and light-load efficiency modes; requires additional design effort for stability and higher quiescent current (14µA vs. 3.5µA). | Choose TPS54560BQDDARQ1 only when strict AEC-Q100 automotive qualification is required; MAX17546ATP+T delivers superior ease-of-use and light-load performance for industrial use. |
Compared with LM5164QPWPRQ1 and TPS54560BQDDARQ1, the MAX17546ATP+T uniquely combines integrated high-side FET, internal compensation, triple-mode operation (PFM/DCM/PWM), and EXTVCC efficiency boost - reducing total solution size, design cycle time, and light-load power loss in 4.5V–42V industrial applications.
Availability
MAX17546ATP+T is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and base-station power supplies requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17546ATP+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, communications, and computing applications.
The MAX17546ATP+T belongs to Maxim's high-voltage synchronous buck converter product line, engineered for rugged industrial point-of-load conversion where wide input range, high efficiency, and integrated protection are essential.
FAQ
What is the maximum output current capability of the MAX17546ATP+T?
The MAX17546ATP+T delivers up to 5A continuous output current under proper thermal conditions (e.g., four-layer PCB with EP thermal vias). Peak current limit is programmable from 5.85A to 9.1A via the DL pin resistor, and runaway current threshold ranges from 6.7A to 10.4A - enabling robust overload handling without external current-sense amplifiers.
Does the MAX17546ATP+T require external compensation components?
No, the MAX17546ATP+T features fully integrated Type-II compensation, eliminating the need for external RC networks on the CF or FB pins across its entire output voltage range (0.9V to 0.9×VIN). External CF capacitor is only required when switching frequency is set below 450kHz - otherwise, CF may be left unconnected.
How does the MODE/SYNC pin configure operating modes on the MAX17546ATP+T?
The MODE/SYNC pin latches its state at power-up to select mode: grounded = PWM (constant-frequency, negative inductor current), open = PFM (pulse-skipping, 2A fixed peak, highest light-load efficiency), connected to VCC = DCM (constant-frequency zero-current detection). Mode changes during operation are ignored - reconfiguration requires power cycle.
Can the MAX17546ATP+T be synchronized to an external clock?
Yes, the MAX17546ATP+T supports external clock synchronization via the MODE/SYNC pin. When configured for PWM or DCM mode, it accepts TTL/CMOS-compatible clock signals from 1.1×fSW to 1.4×fSW, with minimum pulse width of 50ns - enabling precise EMI reduction and multi-phase interleaving in complex power systems.
What thermal performance can be expected from the MAX17546ATP+T in a standard PCB layout?
In a four-layer board with proper thermal design (exposed pad soldered to SGND plane using ≥6 thermal vias), the MAX17546ATP+T achieves θJA = 23°C/W. At 5A load and 24V input, junction temperature rise is approximately 69°C above ambient - well within the +150°C absolute max, allowing reliable operation at +125°C ambient with appropriate derating.
MAX17546ATP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 20-WQFN 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):
- 4.5V
- Voltage - Input (Max):
- 42V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 37.8V
- Current - Output:
- 5A
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (5x5)
MAX17546ATP+T FAQ
1.How can I place an order for MAX17546ATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17546ATP+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 MAX17546ATP+T reliable?
The price and inventory of MAX17546ATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17546ATP+T is usually 5 days.
3.What payment methods are accepted for MAX17546ATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17546ATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17546ATP+T?
MAX17546ATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17546ATP+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 MAX17546ATP+T?
For technical support, including MAX17546ATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17546ATP+T requirements.
6.How does Aetrix verify that MAX17546ATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17546ATP+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 MAX17546ATP+T meets industry standards.
7.What is the process for return or replacement of MAX17546ATP+T?
All MAX17546ATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17546ATP+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 MAX17546ATP+T part is unused and in its original packaging.
Return procedure for MAX17546ATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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