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Analog Devices Inc./Maxim Integrated MAX17633BATP+
- Part No.:
- MAX17633BATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17633BATP+.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:599
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Product details
Overview
The MAX17633BATP+ from Maxim Integrated is a high-efficiency, synchronous step-down DC-DC converter with integrated MOSFETs, delivering up to 3.5A output current across a 4.5V–36V input range. It features fixed 5V output, ±1.3% feedback regulation accuracy over –40°C to +125°C, peak-current-mode control, and operates in PWM/DCM/PFM modes. It is used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17633BATP+ datasheet, MAX17633BATP+ pinout, MAX17633BATP+ application, or MAX17633BATP+ equivalent, key selection considerations include its 20-pin TQFN package, 5V fixed output, EXTVCC auxiliary supply support, hiccup-mode overload protection, and CISPR 22 Class B EMI compliance.
Technical Context
The MAX17633BATP+ implements peak-current-mode control with internal transconductance error amplifier, slope compensation, and dual-MOSFET switching. Its MODE/SYNC pin selects between constant-frequency PWM (SGND), discontinuous-conduction mode DCM (INTVCC), or pulse-frequency modulation PFM (open).
It integrates internal compensation for stable operation across the full output voltage range, eliminates need for external Schottky diodes, supports all-ceramic capacitor designs, and includes built-in output monitoring with open-drain RESET assertion at FB <92% of regulation threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - enables direct use with 12V/24V industrial rails and wall adapters without pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.3% - guaranteed accuracy over –40°C to +125°C ambient, simplifies point-of-load design. |
| Max Output Current | 3.5A continuous - supports demanding loads like FPGAs, microcontrollers, and interface ICs. |
| Switching Frequency | 400kHz to 2.2MHz adjustable via RT resistor - allows optimization of size vs. efficiency and EMI performance. |
| Efficiency Peak | >93% - achieved using synchronous rectification and low RDS(ON) MOSFETs (65mΩ HS / 40mΩ LS). |
| Quiescent Current | 96μA in PFM mode - extends battery life in always-on industrial sensors and remote I/O modules. |
| Shutdown Current | 2.8μA - enables ultra-low-power system-level standby states. |
Pinout & Package
Package: 20-pin, 4mm × 4mm TQFN with exposed pad (package code T2044+4C, outline 21-100172). Thermal resistance θJA = 26°C/W on four-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 PGND | Power Ground | Low-impedance return path for high-current LX switching; must connect directly to power ground plane with multiple vias. |
| 2, 3, 14 IN | Input Supply | Accepts 4.5V–36V; requires ≥2.2μF ceramic decoupling placed adjacent to pins for stability and EMI suppression. |
| 4 EN/UVLO | Enable / Input UVLO | Configurable turn-on threshold (1.19–1.26V rising); supports resistor-divider biasing or direct IN tie for always-on operation. |
| 5 RESET | Open-Drain Fault Flag | Asserts low when FB falls below 92% of target; deasserts after 1024 cycles once FB rises above 95% - provides reliable power-good sequencing. |
| 6 INTVCC | Internal 5V LDO Output | Supplies internal circuitry; bypassed with 2.2μF ceramic to SGND; not intended for external loading. |
| 7 SGND | Analog Ground | Reference for FB, SS, RT, MODE/SYNC; must be isolated from PGND except at single-point connection near EP. |
| 8 SS | Soft-Start Control | Capacitor-to-SGND sets ramp time; supports monotonic startup into prebiased outputs - prevents inrush damage. |
| 9 FB | Feedback Input | Direct connection to VOUT for fixed 5V operation; regulates with ±1.3% accuracy across temperature and line/load. |
| 10 RT | Frequency Programming | Resistor-to-SGND sets fSW from 400kHz to 2.2MHz; open-circuit defaults to ~500kHz - enables EMI spread-spectrum tuning. |
| 11 MODE/SYNC | Mode Selection / Clock Sync | Selects PWM (GND), DCM (INTVCC), or PFM (open); accepts external clock (1.1–1.4× fSW) for synchronized multi-rail systems. |
| 12 EXTVCC | Auxiliary Supply Input | Connect to 5V output to reduce LDO losses and improve efficiency; required for max thermal performance at full load. |
| 13, 16 NC | No Connect | Not internally bonded; must remain unconnected per datasheet layout guidance. |
| 17–19 LX | Switch Node | High-current switching node shared across three pins; connects to inductor's switch-side terminal - minimizes parasitic inductance. |
| 20 BST | Bootstrap Capacitor Terminal | Requires 0.1μF ceramic between BST and LX to gate-drive high-side MOSFET; critical for proper high-side conduction. |
| EP | Exposed Pad | Thermal and electrical connection to SGND; must be soldered and connected to large SGND plane with ≥6 thermal vias for θJA compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous Buck Architecture | Integrated 65mΩ high-side and 40mΩ low-side nMOSFETs eliminate external Schottky diode and associated losses. |
| Internal Compensation | Eliminates external Type-II/III compensation network - reduces BOM count and layout sensitivity across 5V output. |
| Hiccup-Mode Overload Protection | Enters current-limited restart cycle upon sustained overcurrent - protects MOSFETs and inductor during short-circuit events. |
| Programmable EN/UVLO Threshold | Adjustable turn-on voltage via resistor divider on EN/UVLO - enables precise brown-in/brown-out control for system-level power sequencing. |
| CISPR 22 Class B Compliance | Meets radiated EMI limits without additional shielding or filtering - reduces system-level certification effort for industrial equipment. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, motor drivers, and sensor interfaces in factory automation cabinets with 24V DC bus. IC Role / Device Role / Timing Role: Primary 5V rail generator delivering 3.5A with hiccup-mode fault recovery and wide input tolerance. Use Value: Enables compact, thermally robust 5V conversion without external diodes or compensation components - reduces PCB area by >30% vs. discrete solutions. | Use Scenario: Local regulation for FPGA core/logic banks, ARM SoCs, and high-speed SerDes in telecom edge devices. IC Role / Device Role / Timing Role: Fixed-output buck regulator providing clean, sequenced 5V supply with RESET signaling for processor boot integrity. Use Value: Delivers ±1.3% output accuracy across –40°C to +125°C and supports soft-start into prebiased rails - ensures deterministic power-up behavior. |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Secondary 5V rail generation in distributed power architectures where intermediate bus voltages (e.g., 12V, 24V, 48V) feed local converters. IC Role / Device Role / Timing Role: High-efficiency, EMI-compliant POL converter operating from 4.5V–36V input with programmable frequency synchronization. Use Value: Supports external clock sync (1.1–1.4× fSW) to eliminate beat frequencies in multi-rail systems - improves system-level EMI margin. | Use Scenario: Powering RF front-end ICs, ADCs, and clock buffers in 4G/5G macro base stations with stringent thermal and reliability requirements. IC Role / Device Role / Timing Role: Robust 5V supply with overtemperature shutdown (165°C), wide ambient range (–40°C to +125°C), and 2.8μA shutdown current. Use Value: Maintains operation under high ambient temperatures and enables low-power deep-sleep states - extends field lifetime in sealed enclosures. |
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, 3A max, no integrated compensation, requires external loop compensation network. | Automotive AEC-Q100 qualified; wider input range but higher BOM count and layout complexity. | Choose LM5164QPWPRQ1 only if >36V input or automotive qualification is mandatory; MAX17633BATP+ offers lower component count and faster design cycle for industrial 5V POL. |
| TPS54561DRCT | 4.5V–60V input, 5.5A max, fixed 5V option (TPS54561T), but lacks EXTVCC, PFM mode, and RESET output. | Higher current rating but no hiccup-mode protection or integrated power-good flag - requires external supervisor IC. | Choose TPS54561DRCT only if >3.5A load or >36V input is needed; MAX17633BATP+ provides superior light-load efficiency and fault visibility in space-constrained industrial designs. |
Compared with LM5164QPWPRQ1 and TPS54561DRCT, the MAX17633BATP+ delivers best-in-class integration for 5V industrial POL: built-in compensation, RESET, EXTVCC, and PFM/DCM modes reduce total solution size and improve light-load efficiency without sacrificing reliability or thermal performance.
Availability
MAX17633BATP+ 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, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX17633BATP+ 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 precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX17633 series belongs to the Himalaya family of high-voltage DC-DC regulators, engineered to deliver cooler, smaller, and simpler power solutions for harsh industrial environments with wide input ranges and integrated protection features.
FAQ
What is the output voltage of the MAX17633BATP+?
The MAX17633BATP+ is the fixed 5V output variant of the MAX17633 family. Its feedback regulation voltage is 5.0V with ±1.3% accuracy over the full –40°C to +125°C operating temperature range. The FB pin is connected directly to the output for this configuration, eliminating external resistor dividers.
Does the MAX17633BATP+ require external compensation components?
No, the MAX17633BATP+ includes fully integrated compensation across its fixed 5V output range. This eliminates the need for external Type-II or Type-III compensation networks, reducing component count, PCB area, and design validation effort compared to controllers requiring external loop compensation.
Can the MAX17633BATP+ synchronize to an external clock?
Yes, the MAX17633BATP+ supports external clock synchronization via the MODE/SYNC pin. When an external clock signal within 1.1× to 1.4× the RT-set switching frequency is applied, the device locks to that frequency and operates in PWM mode - enabling noise-sensitive multi-rail systems to avoid beat frequencies.
What thermal performance can be expected from the MAX17633BATP+ in a standard layout?
On a four-layer PCB per the MAX17633 evaluation kit layout, the MAX17633BATP+ achieves a junction-to-ambient thermal resistance (θJA) of 26°C/W. With proper EP grounding and ≥6 thermal vias to a solid SGND plane, it sustains 3.5A continuous output at +70°C ambient before derating begins.
How does the MAX17633BATP+ handle overload or short-circuit conditions?
The MAX17633BATP+ employs hiccup-mode overcurrent protection. Upon detecting sustained overcurrent (e.g., short-circuit), it shuts down, waits for thermal recovery, then attempts restart. This cycle repeats until fault clears - protecting internal MOSFETs, inductor, and PCB traces without requiring external current-limit circuitry.
MAX17633BATP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 32.4V
- Current - Output:
- 3.5A
- Frequency - Switching:
- 380kHz ~ 2.45MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TQFN (4x4)
MAX17633BATP+ FAQ
1.How can I place an order for MAX17633BATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17633BATP+ 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 MAX17633BATP+ reliable?
The price and inventory of MAX17633BATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17633BATP+ is usually 5 days.
3.What payment methods are accepted for MAX17633BATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17633BATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17633BATP+?
MAX17633BATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17633BATP+ 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 MAX17633BATP+?
For technical support, including MAX17633BATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17633BATP+ requirements.
6.How does Aetrix verify that MAX17633BATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17633BATP+ 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 MAX17633BATP+ meets industry standards.
7.What is the process for return or replacement of MAX17633BATP+?
All MAX17633BATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17633BATP+, 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 MAX17633BATP+ part is unused and in its original packaging.
Return procedure for MAX17633BATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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