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Analog Devices Inc./Maxim Integrated MAX17672CATB+
- Part No.:
- MAX17672CATB+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
MAX17672CATB+.pdf
- Description:
- IC REG BUCK ADJ 150MA 10TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,727
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Product details
Overview
MAX17672CATB+ from Maxim Integrated is a dual-output Himalaya-series power management IC integrating a 4V–60V, 150mA synchronous step-down DC-DC converter with adjustable output (0.8V to 90% of VIN) and a high-PSRR, low-noise 50mA linear regulator supporting 1.2V–3.3V outputs. It operates across -40°C to +125°C ambient, features 200kHz–2.2MHz programmable switching frequency, and delivers up to 98% duty-cycle operation for high-input-voltage industrial power rails.
For engineers reviewing the MAX17672CATB+ datasheet, MAX17672CATB+ pinout, MAX17672CATB+ application, or MAX17672CATB+ equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world application mappings - all derived from Maxim's official datasheet Rev 2 (April 2020) and evaluation kit documentation.
Technical Context
The MAX17672CATB+ implements a two-stage regulation architecture: a primary high-voltage buck converter with internal pMOS/nMOS FETs (RDS-ON,H = 2.7–5.1Ω, RDS-ON,L = 1.33–2.7Ω) and secondary LDO with ±1.3% output accuracy over temperature. Its feedback loop supports resistor-programmable output via FBBUCK (0.782–0.814V regulation voltage), enabling precise adjustment without external compensation.
Control logic includes PFM/PWM mode selection via MODE/SYNC, monotonic startup into prebiased loads, built-in soft-start (tSS1 = 4.4–5.8ms), and integrated protection: peak current limit (245–345mA), hiccup-mode overload recovery (51ms timeout), overtemperature shutdown (160°C), and RESET assertion when FBBUCK or OUTL falls below 92% of regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range (Buck) | 4V to 60V - enables direct replacement of legacy 24V/48V industrial supplies without intermediate pre-regulation. |
| Buck Output Current | 150mA continuous - sufficient for powering microcontrollers, sensors, and interface ICs in space-constrained systems. |
| LDO Output Accuracy | ±1.3% over -40°C to +125°C - ensures stable reference and analog circuit operation across extended temperature ranges. |
| Switching Frequency Range | 200kHz to 2.2MHz - allows EMI-sensitive designs to avoid critical bands (e.g., AM radio) while optimizing efficiency vs. size trade-offs. |
| Quiescent Current | 70μA in PFM mode - extends battery life in always-on IoT sensor nodes and remote monitoring devices. |
| Shutdown Current | 2.5μA - meets ultra-low-power requirements for energy-harvesting and wake-on-event applications. |
| Thermal Resistance θJA | 41°C/W on 4-layer board - supports 1952mW max power dissipation at 70°C ambient before derating begins. |
Pinout & Package
MAX17672CATB+ is housed in a compact 10-pin TDFN package (3mm × 3mm, 0.5mm pitch, exposed pad), optimized for high-density PCB layouts and thermal performance. The EP (exposed pad) must be soldered to a thermal plane for reliable operation at full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | High-voltage input supply | Accepts 4V–60V; requires local 1μF X7R ceramic decoupling to GND for stability and EMI suppression. |
| 2 EN/UVLO | Enable and input undervoltage lockout | Resistor-divider programmable turn-on threshold (1.19–1.24V); pull low to disable device with <4.5μA shutdown current. |
| 3 RT | Switching frequency programming | Connect resistor to GND to set fSW from 200kHz–2.2MHz; open-circuit defaults to 600kHz. |
| 4 FBBUCK | Buck converter feedback input | 0.782–0.814V reference; for MAX17672, connect to resistor divider from VOUT to GND to set adjustable output. |
| 5 OUTL | Linear regulator output | Delivers 1.2V–3.3V at ≤50mA; requires ≥2.2μF ceramic capacitor to GND for PSRR and transient response. |
| 6 INL | LDO input / bootstrap bias | Accepts 2.35V–5.5V; auto-switches between buck output and external supply; enables improved efficiency via internal bias generation. |
| 7 RESET | Open-drain power-good indicator | Asserts low if FBBUCK or OUTL drops below 92% of regulation; releases 2.1ms after both recover to >95%. |
| 8 MODE/SYNC | Mode control and clock sync | Pull to GND for PFM; leave floating for PWM; accepts external sync signal up to 1.4× fSW for system-level timing alignment. |
| 9 LX | Switch node | Connects to external inductor; carries high di/dt; requires tight layout and Kelvin connection to minimize ringing and EMI. |
| 10 GND | Power and signal ground | Common return for all circuits; must be connected to EP for thermal and noise integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-regulator architecture | Eliminates need for separate buck + LDO ICs, reducing BOM count, footprint, and design validation effort. |
| All-ceramic capacitor support | Enables compact, low-profile designs without electrolytic or tantalum capacitors - improving reliability and lifetime. |
| Inductive short protection | Detects and limits fault current during inductor saturation or output short, preventing MOSFET destruction under abnormal conditions. |
| Monotonic startup into prebiased load | Prevents reverse current flow into powered downstream circuits during power-up, protecting sensitive analog or digital loads. |
| Resistor-programmable EN/UVLO | Allows precise input voltage turn-on point (e.g., 12V system start at 10.5V) without additional supervisory ICs. |
| High PSRR linear regulator | Delivers >60dB PSRR at 100Hz and >40dB at 1MHz - critical for noise-sensitive ADCs, RF transceivers, and precision references. |
Applications
| Industrial Sensor Node | Building Automation Controller |
|---|---|
|
Use Scenario: A wireless temperature/humidity sensor node powered by 24V DC bus in HVAC ductwork, operating continuously at -25°C to +70°C. IC Role / Device Role / Timing Role: MAX17672CATB+ provides regulated 3.3V for MCU and 1.8V for digital sensor interface, while rejecting ripple from shared 24V supply. Use Value: Dual-output integration eliminates discrete LDO, reducing component count by 33%; ±1.3% LDO accuracy maintains ADC reference stability across temperature. |
Use Scenario: DIN-rail mounted controller managing lighting, blinds, and occupancy sensors in commercial buildings using 48V PoE-derived power. IC Role / Device Role / Timing Role: MAX17672CATB+ generates clean 3.3V for ARM Cortex-M7 MCU and 5V for RS-485 transceivers from fluctuating 48V input. Use Value: 60V max input withstands 48V surge transients per IEC 61000-4-5; 200kHz–2.2MHz fSW allows EMI filtering to meet CISPR 22 Class B radiated emissions. |
| Portable Test Equipment | Rail-to-Rail Industrial I/O Module |
|
Use Scenario: Battery-powered handheld multimeter requiring stable 3.3V for display and 1.2V for precision DAC, operating from 2S Li-ion (6–8.4V). IC Role / Device Role / Timing Role: MAX17672CATB+ regulates buck output to 3.3V and LDO to 1.2V, with PFM mode extending runtime at light loads. Use Value: 70μA quiescent current extends battery life >30% vs. conventional buck-LDO combos; monotonic startup prevents display corruption during cold boot. |
Use Scenario: 24V-powered PLC I/O module needing isolated 5V for optocouplers and 3.3V for FPGA configuration memory, deployed in factory environments. IC Role / Device Role / Timing Role: MAX17672CATB+ supplies both rails with independent reset monitoring - RESET asserts if either rail deviates >8%. Use Value: Integrated RESET simplifies system-level power sequencing; ±2% buck accuracy ensures consistent optocoupler LED drive across line and load variations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17671ATB+ | Fixed 5V buck output (vs. adjustable 0.8V–VIN×0.9); identical LDO, package, and feature set. | Suitable where fixed 5V rail is required for legacy peripherals; no resistor divider needed on FBBUCK. | Select MAX17671ATB+ only if 5V buck output suffices and design flexibility for output adjustment is unnecessary. |
| TPS63020DSJR | Buck-boost topology (2.5V–5.5V input, 1.2V–5.5V output); 2A output; no integrated LDO; different pinout and control scheme. | Applicable in battery-powered systems with wide input variation (e.g., single-cell Li-ion), but lacks dual-rail isolation and RESET monitoring. | Choose TPS63020DSJR only for true buck-boost needs; not a functional substitute for MAX17672CATB+'s HV buck + LDO architecture. |
Compared with MAX17671ATB+, MAX17672CATB+ offers output voltage adjustability essential for custom rail generation, while TPS63020DSJR serves fundamentally different use cases requiring input voltage down-conversion *and* up-conversion - neither matches the MAX17672CATB+'s combination of high-voltage input tolerance, integrated LDO, and precision RESET monitoring.
Availability
MAX17672CATB+ is available at Aetrix Electronics and suitable for industrial sensor nodes, building automation controllers, portable test equipment, and rail-to-rail industrial I/O modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17672CATB+ 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 MAX17672CATB+ - was engineered to replace discrete power solutions in space- and thermally-constrained industrial systems, emphasizing high input voltage tolerance, integrated protection, and minimal external components.
FAQ
What is the maximum input voltage rating for the MAX17672CATB+ buck converter stage?
The MAX17672CATB+ buck converter supports an absolute maximum input voltage of 70V (IN to GND), with recommended continuous operation up to 60V. This 4V–60V operating range allows direct interfacing with 24V, 36V, and 48V industrial power buses without external pre-regulation, making MAX17672CATB+ ideal for ruggedized control systems where input transients are common.
How does the MAX17672CATB+ achieve adjustable buck output voltage?
The MAX17672CATB+ uses its FBBUCK pin with an external resistor divider from VOUT to GND to set the output voltage. The internal reference is 0.782–0.814V, so VOUT = 0.8V × (1 + R1/R2). This method enables precise adjustment from 0.8V up to 90% of VIN, unlike the fixed-output MAX17670/MAX17671 variants - a key differentiator confirmed in Maxim's datasheet Rev 2 Section "Adjusting the Output Voltage".
Can the MAX17672CATB+ operate with only the buck converter enabled and the LDO disabled?
Yes - the MAX17672CATB+ allows independent control: the buck converter is enabled via EN/UVLO, while the LDO activates automatically when INL is biased above 2.35V. If INL is grounded or left unconnected, the LDO remains inactive and draws negligible current. This behavior is documented in the "Linear Regulator Power-Supply Input (INL)" section and verified in typical operating characteristics Figure 7.
What is the purpose of the MODE/SYNC pin on the MAX17672CATB+?
The MODE/SYNC pin on MAX17672CATB+ serves dual functions: pulling it to GND selects PFM mode for light-load efficiency, leaving it open enables PWM mode for constant-frequency operation, and applying an external clock (1.1× to 1.4× fSW) synchronizes switching to avoid beat frequencies in multi-rail systems. This flexibility is explicitly defined in the Electrical Characteristics table under "MODE/SYNC Internal Pullup Resistor" and "SYNC Input Frequency".
Does the MAX17672CATB+ include thermal protection, and at what junction temperature does it activate?
Yes, the MAX17672CATB+ incorporates thermal shutdown protection that activates at a junction temperature of 160°C (rising), with 20°C hysteresis. This safeguard prevents permanent damage during overload or poor heatsinking conditions. The specification is guaranteed across the full -40°C to +125°C ambient range and appears in the "THERMAL SHUTDOWN" subsection of the Electrical Characteristics table on page 4 of the datasheet.
MAX17672CATB+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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:
- 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)
MAX17672CATB+ FAQ
1.How can I place an order for MAX17672CATB+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17672CATB+ 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 MAX17672CATB+ reliable?
The price and inventory of MAX17672CATB+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17672CATB+ is usually 5 days.
3.What payment methods are accepted for MAX17672CATB+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17672CATB+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17672CATB+?
MAX17672CATB+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17672CATB+ 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 MAX17672CATB+?
For technical support, including MAX17672CATB+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17672CATB+ requirements.
6.How does Aetrix verify that MAX17672CATB+ is sourced from the original manufacturer or authorized distributors?
All MAX17672CATB+ 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 MAX17672CATB+ meets industry standards.
7.What is the process for return or replacement of MAX17672CATB+?
All MAX17672CATB+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17672CATB+, 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 MAX17672CATB+ part is unused and in its original packaging.
Return procedure for MAX17672CATB+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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