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Analog Devices Inc./Maxim Integrated MAX17632AATE+
- Part No.:
- MAX17632AATE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
MAX17632AATE+.pdf
- Description:
- IC REG BUCK 3.3V 2A 16TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:479
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Product details
Overview
MAX17632AATE+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 2A output at fixed 3.3V from 4.5V–36V input. It features peak-current-mode control, ±1.2% feedback regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes for full- and light-load efficiency. Used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17632AATE+ datasheet, MAX17632AATE+ pinout, MAX17632AATE+ application, or MAX17632AATE+ equivalent, key selection considerations include its 3.3V fixed output, 16-pin 3mm × 3mm TQFN package, 400kHz–2.2MHz adjustable switching frequency, hiccup-mode overload protection, and built-in compensation eliminating external loop components.
Technical Context
The MAX17632AATE+ implements peak-current-mode control with programmable switching frequency (via RT pin) and selectable operation modes (PWM, DCM, PFM) through the MODE/SYNC pin. Its internal high-side (125–250mΩ) and low-side (80–160mΩ) nMOSFETs enable synchronous rectification without external Schottky diodes.
It integrates a 5V LDO (VCC) with 4.75–5.25V output and 25–50mA current limit, auxiliary EXTVCC switchover (4.56–4.84V), soft-start (5μA charging current), and open-drain RESET with 90.5–94.6% FB undervoltage assertion threshold. Thermal shutdown activates at 165°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - supports wide industrial input rails including 12V, 24V, and 36V bus systems. |
| Output Voltage | Fixed 3.3V ±1.2% - guaranteed regulation accuracy across –40°C to +125°C ambient. |
| Output Current | Up to 2A continuous - sufficient for powering FPGAs, microcontrollers, and industrial I/O modules. |
| Switching Frequency | 400kHz to 2.2MHz - adjustable via RT resistor; enables compact magnetics and EMI optimization. |
| Peak Efficiency | 94% - achieved in PWM mode at mid-load; enhanced light-load efficiency via PFM/DCM modes. |
| Shutdown Current | 2.8μA - ultra-low quiescent draw for battery-backed or always-on systems. |
| Package | 16-pin TQFN (3mm × 3mm, 0.5mm pitch) - thermally enhanced footprint with EP for PCB heat dissipation. |
Pinout & Package
MAX17632AATE+ is housed in a 16-pin, 3mm × 3mm, 0.5mm-pitch TQFN package with exposed pad (EP) for thermal management. The package code is T1633+5C (outline 21-0136), compatible with standard reflow profiles (260°C peak).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EN/UVLO | Enable / Input UVLO Threshold Control | Active-high enable; resistor-divider sets turn-on voltage (1.19–1.26V rising); supports prebiased startup. |
| 2 VCC | Internal 5V LDO Output | Bypassed with 2.2μF ceramic; powers internal circuitry; not intended for external loading. |
| 3 SGND | Analog Ground Reference | Separate ground for feedback and control circuits; must be connected to PGND at single point near IC. |
| 4 MODE/SYNC | Mode Selection / External Clock Input | SGND = PWM; open = PFM; VCC = DCM; also accepts external sync clock (1.1–1.4× fSW range). |
| 5 SS | Soft-Start Timing Input | Capacitor-to-ground sets ramp time; 5μA constant current charges SS node for monotonic startup. |
| 6 FB | Feedback Voltage Sense | Direct connection to 3.3V output; regulates to 3.3V ±1.2% with 3.26–3.34V internal reference. |
| 7 RT | Frequency Programming Input | Resistor-to-ground sets fSW from 400kHz (open) to 2.2MHz (8.06kΩ); enables EMI spread-spectrum tuning. |
| 8 RESET | Open-Drain Power-Good Output | Asserts low when FB falls below 92% of setpoint; deasserts after 1024 cycles once FB exceeds 95%. |
| 9 EXTVCC | Auxiliary Supply Input | Connects to regulated output (e.g., 3.3V) to reduce VCC LDO losses and improve efficiency. |
| 10–11 PGND | Power Ground Return | Dual pins minimize high-current return path impedance; must connect directly to input/output capacitors. |
| 12 LX | Switch Node | Connects to inductor; handles peak currents up to ±3.5A RMS; requires tight layout to minimize ringing. |
| 13 BST | Bootstrap Capacitor Connection | Connects to 0.1μF ceramic between BST and LX; enables high-side gate drive above VIN. |
| 14 VIN | Main Input Supply | Accepts 4.5V–36V; includes -0.3V to +40V absolute max rating; decoupled with ≥2.2μF ceramic. |
| 15–16 EP | Exposed Thermal Pad | Internally connected to PGND; must be soldered to large copper pour for θJA = 38°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous MOSFET Integration | Eliminates external Schottky diode and reduces conduction loss - enables >94% peak efficiency. |
| Internal Compensation | Removes need for external Type-II/III compensation network - simplifies design and saves board space. |
| Multi-Mode Operation (PWM/DCM/PFM) | Enables >85% efficiency at 1mA load (PFM) while maintaining stable 400kHz operation at full load (PWM). |
| Hiccup-Mode Overcurrent Protection | Shuts down on sustained overload (>3.15A peak), then auto-retries - protects against short-circuit faults. |
| Prebiased Soft-Start | Supports monotonic startup into precharged outputs (e.g., hot-swap or backplane applications) without reverse current. |
| Programmable EXTVCC Switchover | Reduces VCC LDO dropout loss by sourcing VCC from output rail when EXTVCC > 4.56V - improves full-load efficiency by ~1.5%. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
|
Use Scenario: Powering PLC I/O modules, sensor interfaces, and fieldbus transceivers in factory automation cabinets with 24V DC rails. IC Role / Device Role: Primary 3.3V buck regulator converting unregulated 24V supply to clean, efficient logic rail. Use Value: Delivers 2A with ±1.2% regulation across –40°C to +125°C, enabling reliable operation in harsh cabinet environments. |
Use Scenario: Local regulation for FPGA core or DDR memory on embedded computing boards with high-voltage input (12–36V). IC Role / Device Role: Compact, high-efficiency PoL converter replacing discrete buck controllers and external MOSFETs. Use Value: 3mm × 3mm TQFN package and all-ceramic capacitor support enable <150mm² solution size with no electrolytics. |
| Distributed Supply Regulation | Base Station Power Supplies |
|
Use Scenario: Secondary regulation stage in telecom equipment where 48V intermediate bus is stepped down to 3.3V for digital signal processors. IC Role / Device Role: High-input-voltage buck converter with hiccup-mode OCP and RESET monitoring for system-level fault reporting. Use Value: 36V max input and 165°C thermal shutdown ensure robustness under transient overvoltage events on shared bus rails. |
Use Scenario: Powering RF front-end bias rails and control logic in 4G/5G small cell base stations operating from 24V or 48V inputs. IC Role / Device Role: Low-noise, high-efficiency 3.3V source with programmable frequency to avoid critical RF bands. Use Value: 400kHz–2.2MHz fSW adjustment and external clock sync allow precise EMI placement away from sensitive receivers. |
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, 3.3V fixed, 1A output; requires external MOSFETs and compensation; AEC-Q100 qualified. | Automotive-grade alternative with higher VIN but lower current; lacks integrated MOSFETs and EXTVCC. | Select LM5164QPWPRQ1 only if automotive qualification or >36V input is required; MAX17632AATE+ offers higher current and simpler BOM. |
| TPS54202DDCR | 4.5V–28V input, 3.3V fixed, 2A output; integrated FETs; 500kHz fixed fSW; no EXTVCC or hiccup OCP. | Limited to 28V input; lacks programmable frequency, PFM/DCM modes, and robust industrial thermal protection. | Choose TPS54202DDCR for cost-sensitive consumer designs; MAX17632AATE+ provides superior industrial reliability and flexibility. |
Compared with LM5164QPWPRQ1 and TPS54202DDCR, the MAX17632AATE+ uniquely combines 36V input capability, 2A output, integrated MOSFETs, multi-mode efficiency optimization, and hiccup-mode protection - making it optimal for demanding industrial and telecom point-of-load applications.
Availability
MAX17632AATE+ is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, and distributed supply regulation requiring stable component supply and long-term manufacturability.
Supply support for MAX17632AATE+ 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 MAX17632 series is designed as a family of high-voltage, synchronous buck regulators targeting industrial and telecom power systems needing compact, efficient, and robust DC-DC conversion from 4.5V to 36V inputs.
FAQ
What is the output voltage tolerance of the MAX17632AATE+ over temperature?
The MAX17632AATE+ maintains ±1.2% feedback regulation accuracy over the full –40°C to +125°C ambient temperature range. This is guaranteed by design and characterization, with typical FB regulation voltage of 3.30V (min 3.26V, max 3.34V) at TA = +25°C. The tight tolerance ensures stable 3.3V rail integrity for noise-sensitive digital loads like microcontrollers and ADCs across industrial thermal conditions.
Can the MAX17632AATE+ operate with a prebiased output during startup?
Yes, the MAX17632AATE+ supports monotonic startup into a prebiased output voltage. When EN/UVLO is asserted while VOUT is already present (e.g., 1.65V), the device ramps the output from that initial voltage without causing reverse current or output collapse. This behavior is confirmed in Figure 22 of the datasheet and is enabled by its controlled soft-start architecture and valley-current limiting during startup.
What is the minimum on-time specification for the MAX17632AATE+, and why does it matter?
The MAX17632AATE+ has a minimum on-time of 52ns (typical), which enables high switching frequencies up to 2.2MHz while maintaining regulation at high input-to-output voltage ratios (e.g., 36V → 3.3V). This allows use of smaller inductors and capacitors, reducing solution size and improving transient response - critical for space-constrained applications like base station radios and portable test equipment.
How does the EXTVCC pin improve efficiency in the MAX17632AATE+?
The EXTVCC pin on the MAX17632AATE+ reduces internal LDO power loss by allowing the VCC rail to be powered from the regulated output (e.g., 3.3V) instead of VIN. When EXTVCC exceeds 4.56V (rising threshold), the internal LDO switches off and EXTVCC supplies the gate drivers and control circuitry. This improves full-load efficiency by ~1.5% and lowers thermal stress on the IC, especially in high-VIN, low-VOUT applications.
Does the MAX17632AATE+ support external clock synchronization, and what is its capture range?
Yes, the MAX17632AATE+ supports external clock synchronization via the MODE/SYNC pin. It locks to an external clock within a capture range of 1.1× to 1.4× the internally programmed switching frequency (set by RT). For example, with RT configured for 400kHz, the sync input must be between 440kHz and 560kHz. This feature enables deterministic EMI reduction and eliminates beat frequencies in multi-regulator systems.
MAX17632AATE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A
- Frequency - Switching:
- 400kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TQFN (3x3)
MAX17632AATE+ FAQ
1.How can I place an order for MAX17632AATE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17632AATE+ 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 MAX17632AATE+ reliable?
The price and inventory of MAX17632AATE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17632AATE+ is usually 5 days.
3.What payment methods are accepted for MAX17632AATE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17632AATE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17632AATE+?
MAX17632AATE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17632AATE+ 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 MAX17632AATE+?
For technical support, including MAX17632AATE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17632AATE+ requirements.
6.How does Aetrix verify that MAX17632AATE+ is sourced from the original manufacturer or authorized distributors?
All MAX17632AATE+ 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 MAX17632AATE+ meets industry standards.
7.What is the process for return or replacement of MAX17632AATE+?
All MAX17632AATE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17632AATE+, 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 MAX17632AATE+ part is unused and in its original packaging.
Return procedure for MAX17632AATE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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