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Analog Devices Inc./Maxim Integrated MAX17543ATP+T
- Part No.:
- MAX17543ATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17543ATP+T.pdf
- Description:
- IC REG BUCK ADJ 2.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,611
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Product details
Overview
MAX17543ATP+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, operating from 4.5V to 42V input and delivering up to 2.5A output current. It supports adjustable output voltages from 0.9V to 0.9 × VIN, features ±1.1% FB regulation accuracy over –40°C to +125°C, and uses peak current-mode control for stable transient response in industrial power supplies.
For engineers reviewing the MAX17543ATP+T datasheet, MAX17543ATP+T pinout, MAX17543ATP+T application, or MAX17543ATP+T equivalent, key selection considerations include its 20-pin TQFN (4mm × 4mm) package, programmable 100kHz–2.2MHz switching frequency via RT resistor, PFM/PWM/DCM mode flexibility, internal compensation, and built-in RESET with 92%–95% FB threshold hysteresis.
Technical Context
The MAX17543ATP+T implements a peak current-mode control architecture with an internal transconductance error amplifier, slope compensation, and cycle-by-cycle current limiting. Its MODE pin selects between PWM (constant frequency, negative inductor current allowed), PFM (pulse-skipping, ultra-low quiescent current), or DCM (discontinuous conduction, constant frequency down to light loads).
It integrates a 5V LDO (VCC) with 4.75V–5.25V output, 26.5–100mA current limit, and VCC UVLO (3.65V–4.3V). Overcurrent protection includes 3.7A typical peak current limit, 4.3A runaway limit triggering hiccup mode (32,768-cycle timeout), and FB-based hiccup at 0.58V. Thermal shutdown activates at +165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 42V - supports wide-range industrial and telecom inputs without external pre-regulation. |
| Output Current | Up to 2.5A continuous - sufficient for point-of-load regulation of FPGAs, DSPs, and ASICs. |
| Feedback Accuracy | ±1.1% over –40°C to +125°C - ensures stable output voltage across full industrial temperature range. |
| Switching Frequency | 100kHz to 2.2MHz (RT-programmable) - enables optimization of size (high fSW) vs. efficiency (low fSW). |
| Efficiency Peak | >90% - achieved with synchronous rectification and low RDS(on) (165mΩ HS / 80mΩ LS). |
| Shutdown Current | 2.8µA - minimizes battery drain in always-on systems with enable control. |
| Operating Temperature | –40°C to +125°C ambient / –40°C to +150°C junction - qualified for harsh industrial environments. |
Pinout & Package
The MAX17543ATP+T is housed in a 20-pin, 4mm × 4mm TQFN package with exposed pad (EP) for thermal dissipation. Pin 1–3 are VIN (tied together), pins 14–16 are PGND, and pins 17–19 are LX - all multiplexed to reduce impedance and improve current handling. The EP must be soldered to SGND and connected to a thermal plane via vias.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (1–3) | Power Input Supply | Accepts 4.5V–42V; requires local 2.2µF ceramic decoupling to PGND for EMI suppression and stability. |
| EN/UVLO (4) | Enable / Input UVLO Threshold | Configurable turn-on voltage (1.19–1.26V rising); pull to VIN for always-on or use resistor divider for precise input undervoltage lockout. |
| RESET (5) | Open-Drain Output Monitor | Asserts low when FB falls below 92% of regulation; deasserts after 1024 cycles once FB rises above 95% - provides reliable power-good signaling. |
| SYNC (6) | External Clock Input | Accepts 1.1× to 1.4× programmed fSW; enables system-level clock synchronization to reduce beat frequencies and EMI. |
| SS (7) | Soft-Start Timing Control | Capacitor-to-SGND sets ramp time; prevents inrush current and ensures monotonic startup into prebiased outputs. |
| CF (8) | Loop Compensation Node | Connected to FB only for fSW < 500kHz; eliminates need for external compensation network across output voltage range. |
| FB (9) | Feedback Voltage Sense | 0.9V reference; connects to resistor divider from VOUT to SGND - sets output with ±1.1% accuracy over temperature. |
| RT (10) | Frequency Programming | Resistor-to-SGND sets fSW from 100kHz to 2.2MHz; open-circuit defaults to 500kHz - enables layout-optimized switching frequency selection. |
| MODE (11) | Control Mode Selection | Open = PFM (light-load efficiency), GND = PWM (EMI-sensitive), VCC = DCM (balanced efficiency/frequency stability). |
| VCC (12) | Internal 5V LDO Output | Bypassed with 2.2µF ceramic to SGND; powers internal logic and low-side driver - eliminates need for external bias supply. |
| SGND (13) | Analog Ground Reference | Separate from PGND to minimize noise coupling into feedback and control loops; tied to PGND at VCC bypass capacitor. |
| PGND (14–16) | Power Ground Return | Low-impedance return path for high di/dt currents from LX and VIN; must be routed separately from SGND until single-point tie. |
| LX (17–19) | Switching Node | Connects to inductor switch node; high dv/dt requires short, low-inductance trace - critical for EMI and efficiency. |
| BST (20) | Bootstrap Capacitor Terminal | Requires 0.1µF ceramic between BST and LX to drive high-side MOSFET gate - enables 100% duty cycle capability. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Eliminates external Schottky diode and reduces conduction losses - enables >90% peak efficiency at 2.5A. |
| Internal Compensation | Supports full 0.9V–0.9×VIN output range without external compensation components - simplifies design and reduces BOM count. |
| Three-Mode Operation (PWM/PFM/DCM) | Enables dynamic trade-off between light-load efficiency (PFM), EMI predictability (PWM), and mid-load balance (DCM) - no firmware or external logic required. |
| Prebiased Output Startup | Prevents reverse current flow during startup into existing VOUT - essential for hot-swap and redundant power systems. |
| Robust Fault Protection | Includes cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown (+165°C), and FB-monitored RESET - reduces need for external supervision ICs. |
Applications
| Industrial Power Supplies | Distributed Supply Regulation |
|---|---|
Use Scenario: Central 24V/48V rail powering multiple isolated and non-isolated DC-DC stages in PLCs, motor drives, and I/O modules. IC Role / Device Role: Primary non-isolated buck regulator converting 24V–42V input to 3.3V/5V/12V intermediate rails. Use Value: Wide 4.5V–42V input handles brownouts and surges; 2.5A output supports multi-rail loads; PFM mode extends standby runtime. |
Use Scenario: Local voltage regulation on PCBs with long power distribution traces, where line drop and load transients require tight regulation. IC Role / Device Role: Point-of-load (POL) converter placed near FPGA, microcontroller, or ADC to minimize IR drop and noise. Use Value: ±1.1% FB accuracy maintains regulation despite board-level voltage drop; 100kHz–2.2MHz fSW allows small inductors/caps for compact layout. |
| High-Voltage Single-Board Systems | Base Station Power Supply |
Use Scenario: Embedded computing platforms (e.g., COM Express, SMARC) powered directly from 24V/36V industrial bus without intermediate conversion. IC Role / Device Role: Main system rail generator delivering 5V/2.5A or 3.3V/2.5A to processor core and peripherals. Use Value: Monotonic startup into prebiased loads avoids system reset conflicts; RESET output synchronizes with host boot sequence. |
Use Scenario: Remote radio unit (RRU) or small cell base station requiring high-reliability, thermally robust DC-DC conversion in outdoor enclosures. IC Role / Device Role: Secondary buck stage regulating 48V backplane to 5V/3.3V for RF front-end and digital control circuitry. Use Value: –40°C to +125°C operation ensures reliability in uncooled enclosures; hiccup-mode protection sustains operation during antenna fault conditions. |
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 |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5V–65V input, 1.5A output, 100kHz–2.2MHz fSW, no integrated VCC LDO - requires external bias supply. | Automotive AEC-Q100 qualified; lacks RESET output and FB hysteresis monitoring - needs external supervisor for power-good. | Choose LM5164QPWPRQ1 only if 65V max input or automotive qualification is mandatory; MAX17543ATP+T offers higher current and integrated features for industrial use. |
| TPS54240DGQR | 3.5V–42V input, 2.5A output, fixed 500kHz fSW, no MODE pin - only PWM mode, no PFM/DCM light-load optimization. | No soft-start capacitor option (fixed 1.2ms); no SYNC input; lower FB accuracy (±1.5%) - less suitable for precision POL or EMI-sensitive designs. | Choose TPS54240DGQR only if cost sensitivity outweighs need for frequency synchronization, light-load efficiency, or adjustable soft-start. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, the MAX17543ATP+T delivers superior integration (VCC LDO, RESET, MODE-selectable modes), tighter FB accuracy (±1.1%), and flexible soft-start - making it optimal for thermally constrained, high-reliability industrial POL applications where feature completeness matters more than automotive qualification or lowest BOM cost.
Availability
MAX17543ATP+T is available at Aetrix Electronics and suitable for industrial power supplies, distributed supply regulation, and high-voltage single-board systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17543ATP+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 high-performance analog and mixed-signal ICs for industrial, communications, and computing markets, emphasizing reliability, integration, and thermal robustness.
The MAX17543ATP+T belongs to Maxim's high-voltage synchronous buck regulator product line, engineered specifically for industrial and telecom power systems needing wide-input operation, high efficiency across load range, and comprehensive fault protection without external components.
FAQ
What is the maximum output current capability of the MAX17543ATP+T?
The MAX17543ATP+T delivers up to 2.5A continuous output current under thermal limits (θJA = 33°C/W, TA ≤ +70°C). Its peak current-limit threshold is 3.7A (typ), and runaway limit is 4.3A (typ), enabling robust overload handling before entering hiccup mode. Actual achievable current depends on PCB layout, input voltage, output voltage, and ambient temperature - refer to thermal derating curves in the MAX17543ATP+T datasheet for precise design margins.
Does the MAX17543ATP+T require external compensation components?
No, the MAX17543ATP+T features internal compensation that supports the full adjustable output voltage range (0.9V to 0.9 × VIN) without external RC networks. For switching frequencies below 500kHz, a capacitor must be connected from CF to FB per the datasheet; above 500kHz, CF is left open. This eliminates loop compensation design effort and improves design repeatability across different output voltages.
How does the MODE pin affect efficiency and EMI performance in the MAX17543ATP+T?
The MODE pin configures the MAX17543ATP+T into PWM (GND), PFM (open), or DCM (VCC) operation. PWM provides constant-frequency switching - ideal for EMI filtering and predictable noise spectra - but sacrifices light-load efficiency. PFM maximizes light-load efficiency via pulse-skipping but introduces variable frequency and higher output ripple. DCM balances both, maintaining constant frequency while disabling negative inductor current - offering mid-load efficiency close to PFM with EMI benefits of PWM.
Can the MAX17543ATP+T start up into a prebiased output voltage?
Yes, the MAX17543ATP+T supports monotonic startup into prebiased outputs. When enabled, it holds both high-side and low-side MOSFETs off until the PWM comparator commands the first pulse, preventing reverse current flow from the precharged output rail. This behavior is confirmed in the MAX17543ATP+T datasheet's "Prebiased Output" section and validated in typical waveforms (toc16/toc17), making it suitable for hot-swap and redundant power architectures.
What is the function of the RESET output on the MAX17543ATP+T?
The RESET output on the MAX17543ATP+T is an open-drain signal that asserts low when the FB voltage drops below 92% of its regulated value (e.g., 0.828V for a 0.9V reference) and deasserts 1024 switching cycles after FB rises above 95% (e.g., 0.855V). It also pulls low during thermal shutdown. An external pullup resistor is required. This provides accurate, hysteresis-based power-good monitoring without external comparators - directly supporting host processor reset sequencing in industrial controllers.
MAX17543ATP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 20-WFQFN 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:
- 2.5A
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17543ATP+T FAQ
1.How can I place an order for MAX17543ATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17543ATP+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 MAX17543ATP+T reliable?
The price and inventory of MAX17543ATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17543ATP+T is usually 5 days.
3.What payment methods are accepted for MAX17543ATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17543ATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17543ATP+T?
MAX17543ATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17543ATP+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 MAX17543ATP+T?
For technical support, including MAX17543ATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17543ATP+T requirements.
6.How does Aetrix verify that MAX17543ATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17543ATP+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 MAX17543ATP+T meets industry standards.
7.What is the process for return or replacement of MAX17543ATP+T?
All MAX17543ATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17543ATP+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 MAX17543ATP+T part is unused and in its original packaging.
Return procedure for MAX17543ATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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