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Analog Devices Inc./Maxim Integrated MAX17551ATB+T
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- Part No.:
- MAX17551ATB+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17551ATB+T.pdf
- Description:
- IC REG BUCK ADJ 50MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
The MAX17551ATB+T from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated pMOS and nMOS power switches, operating from 4V to 60V input and delivering up to 50mA output current. It supports adjustable output voltages from 0.8V to 0.9 × VIN, achieves ±1.75% FB regulation accuracy over –40°C to +125°C, and features peak-current-mode control with selectable PWM or PFM operation. It is used in industrial sensor nodes requiring ultra-low quiescent current and wide-input voltage tolerance.
For engineers reviewing the MAX17551ATB+T datasheet, MAX17551ATB+T pinout, MAX17551ATB+T application, or MAX17551ATB+T equivalent, key selection criteria include its 22µA no-load supply current in PFM mode, 100kHz–2.2MHz programmable switching frequency via RT/SYNC resistor, internal soft-start, and robust protection suite including overtemperature, hiccup-mode short-circuit, and prebiased startup capability.
Technical Context
The MAX17551ATB+T implements an internally compensated peak-current-mode control architecture with fixed 0.8V internal reference and slope compensation. Its high-side pMOS (RDS(on) = 2.7Ω typ) and low-side nMOS (RDS(on) = 1.25Ω typ) are fully integrated, eliminating external Schottky diodes. The error amplifier drives PWM comparator inputs alongside current-sense and slope signals to determine on-time per cycle.
Operation mode is selected via the MODE pin: unconnected enables automatic PFM at light loads (IPFM = 39mA typ), while grounding forces constant-frequency PWM across all loads. EN/UVLO provides programmable undervoltage lockout (VENR = 1.25V typ), and RESET offers open-drain output with 92–95% VFB threshold hysteresis and 2.1ms delay after regulation recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 60V - supports direct connection to 12V/24V/48V industrial bus rails and battery stacks without pre-regulation. |
| Max Output Current | 50mA - sufficient for powering microcontrollers, sensors, and analog front-ends in space-constrained IoT edge nodes. |
| Feedback Accuracy | ±1.75% over –40°C to +125°C - ensures stable output regulation in harsh industrial ambient conditions. |
| No-Load Supply Current | 22µA in PFM mode - enables multi-year battery life in always-on remote sensing applications. |
| Switching Frequency Range | 100kHz to 2.2MHz - allows optimization of inductor size vs. efficiency and EMI filtering requirements. |
| Quiescent Current in Shutdown | 1.2µA max - minimizes system standby power loss when disabled via EN/UVLO. |
| Thermal Shutdown Threshold | 160°C junction - protects against thermal runaway during overload or poor PCB heatsinking. |
Pinout & Package
MAX17551ATB+T is packaged in a 10-pin TDFN (3mm × 2mm) with exposed pad, optimized for compact industrial PCB layouts and thermal performance (θJA = 67.3°C/W on 4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input Power Supply | Bypassed with 1µF X7R ceramic; withstands up to 70V transient stress; feeds internal high-side switch and bias circuitry. |
| 2 EN/UVLO | Enable / Input UVLO Control | Active-high logic input; rising threshold = 1.25V typ; configurable via resistor divider to set precise turn-on voltage. |
| 3 RT/SYNC | Oscillator Timing / Sync Input | Resistor-to-GND sets fSW (100kHz–2.2MHz); accepts external clock (1.1×fSW) only in PWM mode for EMI reduction. |
| 4 SS | Soft-Start Control | Internal 5µA current source charges external capacitor; controls monotonic VOUT ramp-up; discharges during shutdown. |
| 5 FB | Output Voltage Feedback | Connects to resistor divider from VOUT; regulates output to 0.8V reference; ±1.75% accuracy over full temperature range. |
| 6 VOUT | External Bias Input | Supplies internal circuitry when ≥3.1V; decoupled with 0.22µF and series R+C network for 3.3–5V outputs to prevent overvoltage stress. |
| 7 RESET | Open-Drain Reset Output | Pulls low when VFB falls below 92% of setpoint; high-impedance 2.1ms after VFB rises above 95%; asserts during hiccup timeout. |
| 8 MODE | PFM/PWM Mode Selection | Unconnected = auto PFM at light load; grounded = forced PWM at all loads; not dynamically switchable during operation. |
| 9 GND | Power Ground Reference | Single-point ground connection point; connects to exposed pad (EP) in TDFN package for optimal thermal and noise performance. |
| 10 LX | Switch Node | Connects to inductor switch node; high-impedance in shutdown; handles ±0.8A RMS current; requires low-inductance layout. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Eliminates external Schottky diode, reducing BOM count and improving light-load efficiency by >5% vs. asynchronous designs. |
| Programmable Switching Frequency | 100kHz–2.2MHz via single RT resistor enables EMI compliance tuning and inductor size optimization without changing IC. |
| Prebiased Output Startup | Monotonic start into existing VOUT avoids reverse current flow, critical for hot-swap and redundant power systems. |
| Internal Compensation | Supports any output voltage (0.8V–0.9×VIN) without external compensation components-reduces design iteration time. |
| Hiccup-Mode Short-Circuit Protection | Continuous short-circuit survival with automatic recovery reduces need for external current-limiting circuitry. |
| Ultra-Low Quiescent Current | 22µA no-load IQ in PFM mode extends battery runtime in always-on wireless sensor transmitters and smart meters. |
Applications
| Industrial Sensor Nodes | High-Voltage LDO Replacement |
|---|---|
Use Scenario: Remote temperature/pressure sensors powered by 24V loop-powered or 48V PoE-derived rails in factory automation. IC Role / Device Role / Timing Role: Primary 3.3V/5V local regulator supplying MCU, ADC, and RF transceiver; replaces inefficient linear regulators. Use Value: 90%+ peak efficiency and 22µA no-load current enable >10-year battery life and eliminate heat sink requirements. |
Use Scenario: Replacing 78L05-style LDOs in 36V–60V industrial PLC I/O modules where dropout voltage and thermal dissipation are limiting. IC Role / Device Role / Timing Role: High-input-voltage buck converter generating stable 5V rail for digital logic and interface ICs. Use Value: Delivers 50mA at 90% efficiency vs. <30% for LDOs-reducing power loss from >2W to <0.3W at 48V input. |
| Battery-Powered Equipment | HVAC & Building Control |
Use Scenario: Wireless HVAC zone controllers using two AA/AAA cells (1.8–3.2V) boosted to 5V, then stepped down to 3.3V for ESP32 or Nordic SoC. IC Role / Device Role / Timing Role: Secondary regulated supply stage after boost converter; maintains tight VOUT regulation during battery discharge. Use Value: PFM mode sustains >85% efficiency down to 2mA load-extending operational time between battery replacements. |
Use Scenario: Smart thermostats and damper actuators powered from 24VAC building control transformers rectified to ~34VDC. IC Role / Device Role / Timing Role: Primary DC-DC regulator converting rectified AC-derived DC to clean 3.3V for microcontroller and display driver. Use Value: Wide 4V–60V input range accommodates transformer ripple and brownout events without reset or dropout. |
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), 4–65V input, 100mA output, 1.5µA shutdown current, but requires external compensation and Schottky diode. | Targeted at automotive body electronics; lacks integrated soft-start and RESET output. | Choose for AEC-Q100 compliance and higher output current; accept added BOM cost and layout complexity. |
| TPS54202DRCT | 2.9–17V input, 2A output, 2µA shutdown, integrated FETs, but limited to 17V max input and no PFM mode. | Suited for low-voltage embedded systems (e.g., 12V board rails); cannot replace MAX17551ATB+T in 48V+ applications. | Choose for higher current and lower cost in sub-17V systems; avoid where 4V–60V range or ultra-low IQ is required. |
Compared with LM5164QDDARQ1 and TPS54202DRCT, the MAX17551ATB+T uniquely combines 60V input rating, 22µA PFM IQ, integrated RESET, and internal compensation in a 3mm × 2mm TDFN-making it optimal for space- and power-constrained industrial sensor nodes.
Availability
MAX17551ATB+T is available at Aetrix Electronics and suitable for industrial sensors and process control, high-voltage LDO replacement, and battery-powered equipment requiring stable component supply and long-term manufacturability.
Supply support for MAX17551ATB+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17551ATB+T belongs to Maxim's ultra-small, high-efficiency DC-DC converter product line, designed specifically for low-power industrial and IoT applications demanding wide input voltage range, minimal quiescent current, and robust protection in harsh environments.
FAQ
What is the maximum input voltage rating for the MAX17551ATB+T?
The MAX17551ATB+T has an absolute maximum input voltage rating of 70V on the IN pin, with guaranteed continuous operation from 4V to 60V. This 60V upper limit ensures reliable performance in 48V industrial bus and telecom applications while maintaining margin against transients.
Does the MAX17551ATB+T support startup into a prebiased output?
Yes, the MAX17551ATB+T supports monotonic startup into a prebiased output. During startup, both high-side and low-side MOSFETs remain off until the first PWM pulse is commanded, preventing reverse current flow and ensuring safe operation in hot-swap and redundant power systems.
How is the switching frequency programmed on the MAX17551ATB+T?
The switching frequency of the MAX17551ATB+T is programmed using a single resistor from the RT/SYNC pin to GND. The relationship is fSW(kHz) ≈ 42000 / RT(kΩ), supporting 100kHz to 2.2MHz. External synchronization is also supported in PWM mode via AC-coupled clock signal.
What is the purpose of the VOUT pin on the MAX17551ATB+T?
The VOUT pin on the MAX17551ATB+T supplies internal circuitry when the output voltage exceeds 3.1V. For 3.3V–5V outputs, it must be decoupled with a 0.22µF capacitor and connected to the output capacitor via a 22.1Ω resistor and 0.22µF capacitor to prevent overvoltage stress during short-circuit events.
Can the MAX17551ATB+T operate in both PWM and PFM modes?
Yes, the MAX17551ATB+T supports dual-mode operation: PFM mode (MODE pin unconnected) delivers highest light-load efficiency with pulse skipping, while PWM mode (MODE pin grounded) provides fixed-frequency operation across all loads-critical for EMI-sensitive or frequency-locked systems.
MAX17551ATB+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- Himalaya
- Package/Case:
- 10-WFDFN 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):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 54V
- Current - Output:
- 50mA
- Frequency - Switching:
- 100kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x2)
MAX17551ATB+T FAQ
1.How can I place an order for MAX17551ATB+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17551ATB+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 MAX17551ATB+T reliable?
The price and inventory of MAX17551ATB+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17551ATB+T is usually 5 days.
3.What payment methods are accepted for MAX17551ATB+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17551ATB+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17551ATB+T?
MAX17551ATB+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17551ATB+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 MAX17551ATB+T?
For technical support, including MAX17551ATB+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17551ATB+T requirements.
6.How does Aetrix verify that MAX17551ATB+T is sourced from the original manufacturer or authorized distributors?
All MAX17551ATB+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 MAX17551ATB+T meets industry standards.
7.What is the process for return or replacement of MAX17551ATB+T?
All MAX17551ATB+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17551ATB+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 MAX17551ATB+T part is unused and in its original packaging.
Return procedure for MAX17551ATB+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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