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Analog Devices Inc./Maxim Integrated MAX17546ATP+
- Part No.:
- MAX17546ATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WQFN Exposed Pad
- Datasheet:
-
MAX17546ATP+.pdf
- Description:
- IC REG BUCK ADJ 5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,576
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Product details
Overview
MAX17546ATP+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated high-side MOSFET, operating from 4.5V to 42V input and delivering up to 5A output current. It supports adjustable output voltages from 0.9V to 90% of VIN, features ±1.4% FB regulation accuracy over –40°C to +125°C, and uses peak current-mode control with programmable switching frequency (100kHz–2.2MHz). It is widely used in industrial power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17546ATP+ datasheet, MAX17546ATP+ pinout, MAX17546ATP+ application, or MAX17546ATP+ equivalent, key selection considerations include its internal compensation architecture, DL-to-LX short detection, hiccup-mode overload protection, monotonic startup into prebiased loads, and support for PWM/DCM/PFM operation modes across harsh industrial temperature ranges.
Technical Context
The MAX17546ATP+ implements peak current-mode control with an internal transconductance error amplifier, slope compensation generator, and PWM comparator. Its control logic latches MODE/SYNC state at power-up to select PWM (constant-frequency), PFM (pulse-skipping), or DCM (discontinuous conduction) operation - each with distinct light-load efficiency trade-offs and ripple characteristics.
It integrates dual LDOs (VIN-fed and EXTVCC-fed) with automatic switchover, auxiliary bootstrap LDO for gate drive, and dedicated DL pin for external low-side MOSFET gate control and programmable current-limit thresholds (6.5A–9.1A). The device includes built-in RESET with 92.5%–95.5% VFB trip/deassertion thresholds and thermal shutdown at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports wide industrial input rails including 12V, 24V, and 36V systems without external pre-regulation. |
| Output Current | Up to 5A continuous - enables point-of-load conversion for FPGA, DSP, or ASIC core supplies in compact layouts. |
| 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 (programmable via RT resistor or external sync) - allows EMI optimization and inductor size reduction. |
| Efficiency | Peak >95% - achieved via synchronous rectification, internal high-side MOSFET (RDS-ONH = 45–90mΩ), and PFM/DCM light-load modes. |
| Shutdown Current | 3.5µA - minimizes system standby power loss in battery-backed or energy-sensitive applications. |
| Operating Temperature | –40°C to +125°C ambient / +150°C junction - qualified for demanding industrial and base-station environments. |
Pinout & Package
MAX17546ATP+ is housed in a 20-pin, 5mm × 5mm thin QFN package with exposed pad (TQFN-EP, package code T2055+4), optimized for thermal performance and high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2,14,15 VIN | Power input supply | 4.5V–42V main input; four pins paralleled for low-impedance path and reduced thermal resistance. |
| 3 PGND | Power ground | High-current return path for LX switching node; must be connected to power ground plane with low-inductance layout. |
| 4 VCC | Internal 5V LDO output | Powers internal circuitry and low-side driver; bypassed with 2.2µF ceramic capacitor to SGND. |
| 5 MODE/SYNC | Mode selection & external sync input | Latched at startup: GND = PWM, open = PFM, VCC = DCM; also accepts external clock (1.1×–1.4× fSW) for EMI control. |
| 6 RESET | Open-drain reset output | 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 input | Resistor-to-SGND sets fSW (100kHz–2.2MHz); open = default 450kHz - enables precise EMI tuning and inductor selection. |
| 8 SGND | Analog ground reference | Reference for FB, CF, SS, EN/UVLO; must be star-connected to PGND at VCC bypass cap to minimize noise coupling. |
| 9 CF | Loop compensation capacitor | Required only for fSW < 450kHz; connects between CF and FB to stabilize control loop without external components. |
| 10 FB | Feedback voltage sense | Monitors output via resistor divider; 0.9V reference enables accurate output setting from 0.9V to 0.9×VIN. |
| 11 EXTVCC | External VCC supply input | Accepts 4.84V–24V to power VCC LDO from output rail - improves efficiency at high VIN by reducing dropout losses. |
| 12 SS | Soft-start timing input | Capacitor-to-SGND sets soft-start ramp time - prevents inrush current and enables monotonic startup into prebiased loads. |
| 13 EN/UVLO | Enable and input UVLO threshold | 1.215V rising threshold (±2.5%) - configurable via resistor divider for custom turn-on voltage; supports always-on via VIN pullup. |
| 16 BST | Bootstrap capacitor connection | Connects 0.1µF ceramic cap between BST and LX - provides gate drive voltage for high-side MOSFET during switching. |
| 17,18,19 LX | Switching node | Three pins tied to inductor switch node; handles high di/dt and RMS current (±9.9A) - requires tight layout and thermal vias. |
| 20 DL | Low-side gate driver output | Drives external n-MOSFET gate; resistor-to-SGND selects peak/runaway current limits (6.5A–9.1A) and hiccup/latchoff behavior. |
| EP | Exposed thermal pad | Mandatory connection to SGND plane with multiple thermal vias - critical for achieving θJA = 23°C/W and reliable 5A operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internal compensation | Eliminates need for external compensation network across full 0.9V–0.9×VIN output range - reduces BOM count and design iteration time. |
| All-ceramic capacitor support | Enables compact, low-profile designs using only X7R/X5R MLCCs (no electrolytics required) - improves reliability and lifetime. |
| Programmable current-limit thresholds | Four selectable peak current limits (5.85A–9.1A) via DL resistor - allows precise overload protection tuning for different inductors and load profiles. |
| DL-to-LX short detection | Detects direct short between DL and LX pins - triggers immediate shutdown to prevent damage during external MOSFET failure or PCB fault. |
| Monotonic startup into prebiased loads | Guarantees controlled VOUT ramp even when output is precharged - essential for powering multi-rail SoCs and FPGAs without reverse current. |
| Three-mode operation (PWM/DCM/PFM) | Enables optimal efficiency vs. EMI trade-off: PWM for noise-sensitive apps, PFM for ultra-low quiescent current, DCM for mid-load balance. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
|
Use Scenario: Central 24V/36V 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 buck regulator delivering 5V/3.3V to microcontrollers, sensors, and communication interfaces. Use Value: Wide 4.5V–42V input accommodates brownout and surge conditions; hiccup protection maintains system uptime during transient overloads. |
Use Scenario: Local voltage regulation on dense PCBs where centralized PSUs feed intermediate rails (e.g., 12V → 5V → 1.2V). IC Role / Device Role / Timing Role: Intermediate point-of-load converter supplying 5A to FPGA I/O banks or high-speed SerDes power domains. Use Value: Internal compensation and all-ceramic support simplify layout; 5mm × 5mm TQFN fits tight spaces while sustaining 5A with minimal thermal derating. |
| Base-Station Power Supplies | Wall Transformer Regulation |
|
Use Scenario: Power conversion in remote radio units (RRUs) and small-cell base stations operating in outdoor enclosures. IC Role / Device Role / Timing Role: High-reliability buck stage converting 48V telecom input to 5V/3.3V for RF front-end ICs and digital control logic. Use Value: –40°C to +125°C rating ensures operation under extreme ambient; RESET output enables watchdog-triggered recovery during thermal events. |
Use Scenario: Regulating unregulated DC from wall adapters (e.g., 12V/24V AC-DC bricks) to clean 5V/3.3V for consumer electronics. IC Role / Device Role / Timing Role: Final-stage DC-DC regulator replacing linear regulators to improve efficiency and reduce heat dissipation. Use Value: 3.5µA shutdown current extends battery backup time; PFM mode delivers >85% efficiency at 1mA load - ideal for standby power budgets. |
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, 350mA IOUT, integrated FETs, no EXTVCC or DL pin; lower current rating and no external low-side driver. | Suitable for lower-power automotive body electronics; lacks programmable current limit and hiccup-mode protection. | Select MAX17546ATP+ for ≥5A industrial loads requiring robust overload handling and thermal resilience. |
| MPQ4363GQ-AEC1 | 4.5V–60V input, 6A output, but requires external compensation and has no PFM/DCM mode selection; AEC-Q100 qualified. | Targeted at automotive infotainment; lacks internal compensation and flexible light-load modes needed for industrial efficiency optimization. | Choose MAX17546ATP+ when internal compensation, three-mode operation, and industrial temp range are mandatory. |
Compared with LM5164QPWPRQ1 and MPQ4363GQ-AEC1, the MAX17546ATP+ uniquely combines 5A capability, internal compensation, programmable current limiting via DL, and triple-mode (PWM/DCM/PFM) control - enabling simpler, more robust, and thermally efficient designs in harsh industrial environments.
Availability
MAX17546ATP+ 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+ 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, is a leader in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX17546ATP+ belongs to Maxim's high-voltage synchronous buck converter family, designed specifically for rugged industrial and telecom power systems needing wide input range, high efficiency, and comprehensive protection features.
FAQ
What is the maximum output current supported by the MAX17546ATP+?
The MAX17546ATP+ delivers up to 5A continuous output current under proper thermal conditions (e.g., 4-layer board with EP thermal vias). Peak current-limit thresholds are programmable from 5.85A to 9.1A via the DL pin resistor, allowing design margin adjustment based on inductor saturation and thermal constraints. Derating applies above +70°C ambient per the 33.3mW/°C thermal coefficient.
Does the MAX17546ATP+ require external compensation components?
No, the MAX17546ATP+ features internal compensation that eliminates the need for external Type-II or Type-III compensation networks across its entire output voltage range (0.9V to 0.9×VIN). For switching frequencies below 450kHz, a single capacitor from CF to FB is required - no resistors or additional capacitors are needed, simplifying design and improving stability robustness.
How does the MODE/SYNC pin affect MAX17546ATP+ operation?
The MODE/SYNC pin determines control mode at power-up: grounded = constant-frequency PWM (all loads), open = PFM (pulse-skipping at light loads), connected to VCC = DCM (discontinuous conduction). It also accepts external synchronization signals (1.1×–1.4× fSW) for EMI reduction. Mode changes during operation are ignored - only the initial state is latched.
Can the MAX17546ATP+ operate with a prebiased output?
Yes, the MAX17546ATP+ supports monotonic startup into prebiased loads - a critical feature for powering multi-rail processors and FPGAs. During soft-start, the IC prevents reverse current flow and ensures VOUT ramps cleanly from the precharged level without undershoot or oscillation, verified in typical operating characteristics Figure TOC16 and TOC17.
What protection features are integrated into the MAX17546ATP+?
The MAX17546ATP+ includes hiccup-mode overload protection, DL-to-LX short detection, thermal shutdown (165°C with 10°C hysteresis), output-voltage monitoring with open-drain RESET, programmable EN/UVLO, and minimum on/off-time limits (95ns/140ns). These features collectively safeguard against overcurrent, overtemperature, input undervoltage, and external MOSFET faults without requiring external circuitry.
MAX17546ATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 20-WQFN Exposed Pad
- Packaging:
- Tray
- 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+ FAQ
1.How can I place an order for MAX17546ATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17546ATP+ 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+ reliable?
The price and inventory of MAX17546ATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17546ATP+ is usually 5 days.
3.What payment methods are accepted for MAX17546ATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17546ATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17546ATP+?
MAX17546ATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17546ATP+ 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+?
For technical support, including MAX17546ATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17546ATP+ requirements.
6.How does Aetrix verify that MAX17546ATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17546ATP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17546ATP+?
All MAX17546ATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17546ATP+, 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+ part is unused and in its original packaging.
Return procedure for MAX17546ATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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