MAX17633BATP+T - 36V, 3.5A Synchronous Buck Converter | Analog Devices
MPN: MAX17633BATP+T ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.85 | $4.85 |
| 10 | $4.36 | $43.60 |
| 100 | $3.88 | $388.00 |
| 500 | $3.49 | $1,745.00 |
| 1,000 | $3.1 | $3,100.00 |
MAX17633BATP+T Overview
A synchronous buck converter is a type of DC-DC switching regulator that steps down a higher input voltage to a lower output voltage with high efficiency. It uses two MOSFETs (high-side and low-side) to alternately connect the inductor to the input and ground, minimizing conduction losses compared to asynchronous designs. This topology is essential in power management systems where efficiency and thermal performance are critical, such as in base stations, distributed power architectures, and point-of-load (POL) converters.
Key features of the MAX17633BATP+T include an adjustable output voltage from 0.9V, a MODE/SYNC pin for selecting PWM, PFM, or DCM control schemes, adjustable input undervoltage lockout (UVLO), adjustable soft-start, open-drain RESET output, and external clock synchronization. The switching frequency is programmable from 380kHz to 2.45MHz, allowing designers to optimize efficiency versus component size. The device also offers high efficiency across a wide load range, reducing power dissipation and enabling cooler operation.
The MAX17633BATP+T is designed for robust performance in harsh environments. It includes cycle-by-cycle current limiting, thermal shutdown, and short-circuit protection. The adjustable soft-start prevents inrush current during startup, and the open-drain RESET output provides a power-good signal for system sequencing. The device is available in a 20-WFQFN package with an exposed pad for enhanced thermal performance, and it is RoHS compliant.
Typical applications include base-station power supplies, distributed supply regulation, general-purpose point-of-load converters, high-voltage single-board systems, industrial control power supplies, and wall transformer regulation. Its wide input range and high output current make it ideal for 12V and 24V bus systems, as well as for powering FPGAs, ASICs, and processors in industrial and telecom equipment.
When designing with the MAX17633BATP+T, ensure proper PCB layout with adequate input and output capacitance, and place the inductor and feedback resistors close to the IC to minimize parasitic inductance. The exposed pad should be soldered to a large copper area for effective heat dissipation. The MODE/SYNC pin allows synchronization to an external clock to reduce EMI in multi-rail systems.
Drop-in alternatives for MAX17633BATP+T — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX17633AATP+T
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MAX17633CATP+T
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TPS54360
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LT8610
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
LTC3605
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
MAX17633BATP+T Maximum Ratings & Electrical Characteristics
| Function | Step-Down (Buck) |
| Output Type | Adjustable |
| Output Voltage - Min | 0.9 V |
| Output Current | 3.5 A |
| Input Voltage Range | 4.5 V to 36 V |
| Switching Frequency | 380 kHz to 2.45 MHz |
| Synchronous Rectifier | Yes |
| Control Scheme | PWM, PFM, DCM |
| Package | 20-WFQFN Exposed Pad |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40°C to +125°C |
| Number of Outputs | 1 |
| Synchronization | External Clock |
| Soft-Start | Adjustable |
| UVLO | Adjustable |
| RoHS Status | Compliant |
MAX17633BATP+T Pin Configuration
| Pin 1 | BST — Bootstrap capacitor connection for high-side MOSFET driver |
| Pin 2 | IN — Input supply voltage |
| Pin 3 | IN — Input supply voltage |
| Pin 4 | EN — Enable input (active high) |
| Pin 5 | MODE/SYNC — Control mode selection and external clock synchronization |
| Pin 6 | GND — Ground |
| Pin 7 | GND — Ground |
| Pin 8 | FB — Feedback input for output voltage regulation |
| Pin 9 | COMP — Compensation network connection |
| Pin 10 | SS — Soft-start timing capacitor connection |
| Pin 11 | UVLO — Adjustable input undervoltage lockout |
| Pin 12 | RESET — Open-drain reset output (power-good) |
| Pin 13 | GND — Ground |
| Pin 14 | LX — Switching node connection to inductor |
| Pin 15 | LX — Switching node connection to inductor |
| Pin 16 | PGND — Power ground |
| Pin 17 | PGND — Power ground |
| Pin 18 | OUT — Output voltage sense |
| Pin 19 | OUT — Output voltage sense |
| Pin 20 | OUT — Output voltage sense |
| Pin 21 | EP — Exposed pad (thermal and electrical ground) |
Typical Applications
MAX17633BATP+T is suitable for 6 applications: Base-Station Power Supplies, Distributed Supply Regulation, General-Purpose Point-of-Load, High-Voltage Single-Board Systems, Industrial Control Power Supplies, Wall Transformer Regulation.
Base-Station Power Supplies
The MAX17633BATP+T is ideal for base-station power supplies due to its wide 4.5V to 36V input range and 3.5A output capability. It efficiently steps down 24V or 48V bus voltages to lower rails for RF transceivers and digital processing. Its high efficiency reduces heat dissipation, which is critical in sealed outdoor enclosures. The adjustable output and external synchronization help minimize EMI in sensitive RF environments.
Recommended
Distributed Supply Regulation
In distributed power architectures, the MAX17633BATP+T provides point-of-load regulation from intermediate bus voltages. Its high efficiency and small 20-WFQFN package allow dense board layouts. The adjustable soft-start prevents inrush current during hot-swap, and the open-drain RESET output enables proper sequencing of downstream loads. The wide input range accommodates varying bus voltages.
Recommended
General-Purpose Point-of-Load
The MAX17633BATP+T is a versatile point-of-load converter for powering FPGAs, ASICs, and processors. Its 3.5A output and adjustable voltage from 0.9V make it suitable for core and I/O rails. The MODE/SYNC pin allows synchronization to a system clock, reducing noise in mixed-signal designs. High efficiency across load ranges extends battery life in portable equipment.
Recommended
High-Voltage Single-Board Systems
For single-board systems powered from 24V or 36V supplies, the MAX17633BATP+T provides a robust solution. Its 36V input rating handles voltage transients, and the integrated MOSFETs simplify design. The adjustable UVLO ensures proper startup under brownout conditions. The device's thermal performance is enhanced by the exposed pad, which should be connected to a large copper area.
Recommended
Industrial Control Power Supplies
In industrial control systems, the MAX17633BATP+T powers sensors, actuators, and controllers from 24V rails. Its wide input range and high efficiency reduce thermal stress in cabinets. The adjustable soft-start and RESET output enable safe power-up sequencing. The device's robust protection features, including cycle-by-cycle current limiting and thermal shutdown, ensure reliable operation in harsh environments.
Recommended
Wall Transformer Regulation
The MAX17633BATP+T can regulate the output of wall transformers, providing a clean, stable supply for consumer electronics. Its wide input range accommodates transformer output variations, and the high efficiency reduces wasted power. The small package is ideal for compact adapters. The MODE/SYNC pin can be used to spread spectrum for EMI compliance.
Recommended
Recommended Products Summary
Engineering reference data for MAX17633BATP+T — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX17633AATP+T | MAX17633CATP+T | TPS54360 | LT8610 |
|---|---|---|---|---|---|
| Package | 20-WFQFN Exposed Pad | 20-WFQFN Exposed Pad | 20-WFQFN Exposed Pad | 20-WFQFN Exposed Pad | 20-WFQFN Exposed Pad |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Analog Devices |
| Input Voltage Range | 4.5V to 36V | 4.5V to 36V | 4.5V to 36V | 4.5V to 60V | 3.4V to 42V |
| Output Current | 3.5A | 3.5A | 3.5A | 3.5A | 2.5A |
| Switching Frequency | 380kHz to 2.45MHz | 380kHz to 2.45MHz | 380kHz to 2.45MHz | 100kHz to 2.5MHz | 200kHz to 2.2MHz |
| Control Scheme | PWM, PFM, DCM | PWM, PFM, DCM | PWM, PFM, DCM | PWM | PWM, Burst Mode |
| Synchronous Rectification | Yes | Yes | Yes | Yes | Yes |
| External Synchronization | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Wide input voltage range up to 36V (vs LT8610)
- High output current of 3.5A (vs LT8610)
- Flexible control schemes (PWM, PFM, DCM) (vs TPS54360)
Design Notes
For optimal performance, place the input capacitor (10uF) and output capacitor (22uF) as close to the IC pins as possible. Use a solid ground plane and connect the exposed pad to it with multiple vias to enhance thermal dissipation. Keep the feedback trace short and away from the switching node (LX) to avoid noise coupling.
The MAX17633BATP+T can dissipate significant power at high input-output differentials. For example, at VIN=24V, VOUT=5V, and 3.5A load, power dissipation is approximately 66.5W (assuming 90% efficiency). The 20-WFQFN package has a theta_JA of around 30°C/W, so a large copper area or heatsink is required to keep the junction temperature below 125°C. Use thermal vias under the exposed pad.
Do not operate the device above the absolute maximum input voltage of 36V. Ensure the bootstrap capacitor (BST) is placed close to the BST and LX pins. The MODE/SYNC pin should be tied to a defined logic level if not used. The soft-start capacitor value determines startup time; too small a value may cause inrush current issues.
Compliance Information
RoHS compliant per distributor data. Not AEC-Q100 qualified. Other compliance data not specified in provided sources.
