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Analog Devices Inc./Maxim Integrated MAX17671FATB+
- Part No.:
- MAX17671FATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17671FATB+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:331
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Product details
Overview
MAX17671FATB+ from Maxim Integrated is a dual-output Himalaya-series power management IC integrating a 4V–60V, 150mA synchronous step-down DC-DC converter with fixed 5V output and a high-PSRR, low-noise 50mA linear regulator supporting 3.3V output. It features ±2% step-down regulation accuracy over –40°C to +125°C, 200kHz–2.2MHz adjustable switching frequency, and operates in industrial environments including HVAC control and battery-powered sensors.
For engineers reviewing the MAX17671FATB+ datasheet, MAX17671FATB+ pinout, MAX17671FATB+ application, or MAX17671FATB+ equivalent, key selection considerations include its dual-regulator architecture, 10-pin TDFN package, integrated soft-start and RESET monitoring, and compatibility with all-ceramic capacitor designs for compact, high-reliability power supplies.
Technical Context
The MAX17671FATB+ implements a current-mode synchronous buck controller with internal high-side pMOS (RDS-ON = 2.7Ω typ) and low-side nMOS (RDS-ON = 1.33Ω typ), enabling up to 98% duty-cycle operation and PFM/PWM mode auto-transition. Its linear regulator uses a separate INL input with switchover threshold at 2.725V–3.21V and delivers ±1.33% output accuracy across load and temperature.
Feedback is implemented via dedicated FBBUCK (5V-regulated reference = 4.887–5.087V) and OUTL pins, with built-in monotonic startup into prebiased loads, peak current-limit protection (245–345mA), and thermal shutdown at 160°C. The RESET output asserts low when either regulated rail falls below 92% of nominal value and releases after 2.1ms delay upon recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Step-down Input Range | 4V to 60V - supports wide-input industrial and battery-derived supplies without external pre-regulation. |
| Step-down Output | Fixed 5V ±2% - eliminates external feedback resistors; suitable for powering microcontrollers and logic rails. |
| Linear Regulator Output | 3.3V ±1.33% - low-noise, high-PSRR supply for analog/RF sections; requires ≥2.2μF ceramic output capacitance. |
| Switching Frequency | 200kHz to 2.2MHz - programmable via RT resistor; default 600kHz enables compact magnetics and EMI optimization. |
| No-Load Quiescent Current | 70μA (PFM mode) - extends battery life in always-on sensor nodes and low-power IoT endpoints. |
| Shutdown Current | 2.5μA - ensures minimal leakage during system sleep states; critical for energy-harvesting applications. |
| Operating Temperature | –40°C to +125°C ambient - qualified for harsh industrial environments including motor drives and process controllers. |
Pinout & Package
MAX17671FATB+ is housed in a 10-pin, 3mm × 3mm TDFN package (package code T1033+1C, outline 21-0137) with exposed pad (EP) for thermal dissipation. Thermal resistance θJA = 41°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Step-down converter input supply | Accepts 4V–60V; requires local 1μF X7R ceramic decoupling to GND for stability and EMI reduction. |
| 2 EN/UVLO | Enable and input undervoltage lockout | Resistor-divider programmable turn-on threshold (1.19–1.24V); pull to GND disables both regulators. |
| 3 RT | Switching frequency programming | Connect resistor to GND to set fSW; open-circuit defaults to 600kHz - simplifies layout for standard designs. |
| 4 FBBUCK | Step-down feedback input | Direct connection to 5V output node; internal reference = 4.887–5.087V - no external divider needed. |
| 5 OUTL | Linear regulator output | Delivers 3.3V/50mA; requires ≥2.2μF ceramic cap to GND for PSRR and transient response. |
| 6 INL | Linear regulator input / bootstrap bias | Connected to step-down output (≤5.5V); enables efficient internal biasing and switchover at 2.725–3.21V. |
| 7 RESET | Open-drain power-good monitor | Asserts low if FBBUCK or OUTL drops below 92% of nominal; releases after 2.1ms delay upon recovery. |
| 8 MODE/SYNC | Mode selection & clock sync | GND = PFM mode; floating = PWM; accepts external clock up to 1.4×fSW for EMI synchronization. |
| 9 LX | Switch node | Connects to external inductor; high dv/dt node - requires tight layout and ground shielding to minimize noise. |
| 10 GND | Power and signal ground | Common return for all regulators; tie EP directly to solid ground plane for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous buck with internal MOSFETs | Eliminates external Schottky diode and reduces BOM count; RDS-ON < 5.1Ω (HS) and < 2.7Ω (LS) ensure >90% efficiency at 150mA. |
| All-ceramic capacitor support | Enables compact, low-profile designs without electrolytic or tantalum capacitors - improves reliability and lifetime. |
| Built-in soft-start (4.4–5.8ms) | Prevents inrush current and output overshoot during startup; monotonic into prebiased loads avoids system reset issues. |
| Integrated RESET with dual-rail monitoring | Monitors both step-down (FBBUCK) and linear (OUTL) outputs; provides deterministic power-good signaling for MCU sequencing. |
| Wide input range with UVLO programming | EN/UVLO pin allows custom turn-on voltage (≥4V min); supports brown-out protection in 12V/24V/48V industrial systems. |
| High-PSRR linear regulator | Delivers >60dB PSRR at 100Hz and >40dB at 100kHz - suppresses switching noise from buck stage for sensitive analog circuits. |
Applications
| Industrial Sensor Node | Battery-Powered Telemetry |
|---|---|
|
Use Scenario: Compact wireless sensor transmitting temperature/pressure data via LoRaWAN or NB-IoT. IC Role / Device Role / Timing Role: Dual-regulator PMIC supplying 5V to RF transceiver and 3.3V to ultra-low-power MCU and analog front-end. Use Value: 70μA PFM quiescent current extends 2xAA battery life beyond 5 years; all-ceramic design ensures field reliability. |
Use Scenario: Portable environmental monitor powered by Li-SOCl₂ primary cell with 10-year shelf life. IC Role / Device Role / Timing Role: Primary power conditioner delivering stable 5V/3.3V rails while surviving cold storage and wide VIN transients. Use Value: –40°C to +125°C operation and 2.5μA shutdown current prevent premature battery drain during long idle periods. |
| HVAC Zone Controller | Process Control I/O Module |
|
Use Scenario: DIN-rail mounted thermostat with isolated RS-485, display, and relay drivers. IC Role / Device Role / Timing Role: Central power manager converting 24V AC/DC input to 5V logic and 3.3V analog sensing rails. Use Value: 60V max input withstands load-dump transients; RESET output sequences MCU boot after power restoration. |
Use Scenario: 4–20mA loop-powered transmitter with HART modulation and local diagnostics. IC Role / Device Role / Timing Role: Low-noise dual-output regulator powering precision DACs, ADCs, and digital isolators. Use Value: High-PSRR linear regulator suppresses buck switching noise, enabling <12-bit effective resolution in analog signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17670ATB+ | Fixed 3.3V step-down output (vs. 5V); identical linear regulator (3.3V), pinout, and feature set. | Suitable where main logic rail is 3.3V and no 5V peripheral exists; not drop-in for 5V-dependent loads. | Select MAX17670ATB+ only when system architecture mandates 3.3V primary rail and no 5V interface is required. |
| TPS65270QDAPRQ1 | Automotive-grade dual buck (3.3V/5V) with integrated LDOs; wider temp range (–40°C to +150°C), but no linear regulator monitoring or RESET. | Designed for automotive infotainment and ADAS; lacks linear regulator PSRR and dual-rail RESET - unsuitable for precision analog systems. | Choose TPS65270QDAPRQ1 only for AEC-Q100-compliant automotive designs requiring extended junction temperature rating. |
Compared with MAX17670ATB+, MAX17671FATB+ provides higher primary rail voltage for legacy 5V peripherals; versus TPS65270QDAPRQ1, it offers superior analog noise immunity and deterministic power sequencing via integrated RESET - critical for industrial measurement accuracy.
Availability
MAX17671FATB+ is available at Aetrix Electronics and suitable for industrial sensors and process control, battery-powered telemetry, and HVAC zone controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX17671FATB+ 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 demanding industrial, automotive, and communications applications.
The Himalaya series - including MAX17671FATB+ - was engineered to replace discrete DC-DC + LDO solutions with integrated, thermally robust, and EMI-optimized power management for space-constrained industrial systems.
FAQ
What is the step-down output voltage of the MAX17671FATB+?
The MAX17671FATB+ provides a fixed 5V output from its integrated synchronous step-down converter, with regulation accuracy of ±2% over –40°C to +125°C. This eliminates the need for external feedback resistors and simplifies design for systems requiring a stable 5V rail for microcontrollers or interface ICs.
Does the MAX17671FATB+ require external compensation components?
No, the MAX17671FATB+ features internal compensation, allowing stable operation with all-ceramic output capacitors. This reduces bill-of-materials cost and PCB area while maintaining phase margin >59° across load and temperature - verified in typical application circuits per the datasheet.
How does the RESET function work on the MAX17671FATB+?
The RESET output on the MAX17671FATB+ is an open-drain signal that goes low if either the step-down output (FBBUCK) or linear regulator output (OUTL) falls below 92% of its nominal value, or if EN/UVLO drops below its falling threshold. It returns high 2.1ms after both rails exceed 95% of regulation, provided INL remains above its UVLO level.
Can the MAX17671FATB+ operate with a 3.3V input supply?
No - the MAX17671FATB+ step-down converter requires a minimum input voltage of 4V. Operation below 4V violates absolute maximum ratings and will disable regulation. For sub-4V inputs, consider a boost or buck-boost topology, or use the linear regulator only if INL is supplied externally within its 2.35V–5.5V range.
What is the purpose of the INL pin on the MAX17671FATB+?
The INL pin on the MAX17671FATB+ serves dual functions: (1) it supplies power to the linear regulator, accepting 2.35V–5.5V inputs; and (2) it acts as a bootstrap bias source to improve efficiency. When connected to the step-down output (≤5.5V), INL enables automatic switchover at 2.725–3.21V and powers internal circuitry for lower quiescent current.
MAX17671FATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 50mA, 150mA
- Frequency - Switching:
- 610kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-TDFN (3x3)
MAX17671FATB+ FAQ
1.How can I place an order for MAX17671FATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17671FATB+ 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 MAX17671FATB+ reliable?
The price and inventory of MAX17671FATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17671FATB+ is usually 5 days.
3.What payment methods are accepted for MAX17671FATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17671FATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17671FATB+?
MAX17671FATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17671FATB+ 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 MAX17671FATB+?
For technical support, including MAX17671FATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17671FATB+ requirements.
6.How does Aetrix verify that MAX17671FATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17671FATB+ 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 MAX17671FATB+ meets industry standards.
7.What is the process for return or replacement of MAX17671FATB+?
All MAX17671FATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17671FATB+, 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 MAX17671FATB+ part is unused and in its original packaging.
Return procedure for MAX17671FATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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