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Analog Devices Inc./Maxim Integrated MAX17633BATP+T
- Part No.:
- MAX17633BATP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17633BATP+T.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,356
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Product details
Overview
MAX17633BATP+T from Maxim Integrated is a fixed 5V, 3.5A synchronous step-down DC-DC converter with integrated MOSFETs, operating from 4.5V to 36V input. It features peak-current-mode control, ±1.3% output voltage regulation over –40°C to +125°C, 400kHz–2.2MHz adjustable switching frequency, and built-in compensation eliminating external loop components. It delivers stable 5V power for industrial point-of-load applications requiring high efficiency and compact layout.
For engineers reviewing the MAX17633BATP+T datasheet, MAX17633BATP+T pinout, MAX17633BATP+T application, or MAX17633BATP+T equivalent, key selection considerations include its fixed 5V output, 20-pin TQFN package, hiccup-mode overload protection, EXTVCC auxiliary supply support, and compatibility with all-ceramic capacitor designs in harsh ambient environments.
Technical Context
The MAX17633BATP+T implements a peak-current-mode control architecture with internal transconductance error amplifier, slope compensation, and PWM comparator. Its MODE/SYNC pin selects between PWM (constant frequency), PFM (pulse-skipping), or DCM (discontinuous conduction) operation-enabling >93% peak efficiency and enhanced light-load performance.
It integrates high-side (65–125 mΩ) and low-side (40–80 mΩ) nMOSFETs, supports external clock synchronization (1.1× to 1.4× fSW), and includes programmable EN/UVLO threshold (1.19–1.26 V rising), RESET assertion at 92% FB regulation, and thermal shutdown 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 systems without pre-regulation. |
| Output Voltage | Fixed 5.0V ±1.3% - guaranteed accuracy across –40°C to +125°C ambient, enabling direct powering of 5V logic and peripherals. |
| Max Output Current | 3.5A continuous - sufficient for FPGA I/O banks, microcontroller cores, and multi-rail PMIC front-ends. |
| Switching Frequency | 400kHz to 2.2MHz (adjustable via RT resistor) - allows optimization of size vs. EMI; default 500kHz when RT open. |
| Efficiency | >93% peak - achieved via synchronous rectification and low RDS(on) MOSFETs, reducing thermal load in enclosed enclosures. |
| Quiescent Current | 96μA (PFM mode) - enables ultra-low standby power in always-on industrial monitoring nodes. |
| Shutdown Current | 2.8μA - minimizes battery drain in backup-supply or energy-harvesting applications. |
Pinout & Package
Package: 20-pin, 4mm × 4mm TQFN with exposed pad (EP); RoHS-compliant, thermal resistance θJA = 26°C/W (4-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 PGND | Power ground return for high-current switching path | Must connect directly to low-impedance power ground plane; critical for EMI suppression and current-loop integrity. |
| 2, 3, 14 IN | Main input power supply rail (4.5V–36V) | Requires ≥2.2μF ceramic decoupling placed adjacent to pins; shared with PGND for minimal loop area. |
| 4 EN/UVLO | Enable and input undervoltage lockout control | Configurable turn-on threshold (1.19–1.26V rising); pull high to enable, tie to IN for always-on operation. |
| 5 RESET | Open-drain fault indicator | Asserts low if FB falls below 92% of target; deasserts after 1024 cycles once FB rises above 95%. |
| 6 INTVCC | Internal 5V LDO output | Bypass with 2.2μF ceramic to SGND; not intended for external loading-powers internal circuitry only. |
| 7 SGND | Analog reference ground | Separate from PGND; connects to FB, SS, RT, MODE/SYNC, and EXTVCC for noise-sensitive analog functions. |
| 8 SS | Soft-start timing control | Capacitor from SS to SGND sets ramp time; supports monotonic startup into pre-biased outputs. |
| 9 FB | Feedback input for output voltage regulation | Direct connection to 5V output (no divider needed); ±1.3% regulation accuracy over full temperature range. |
| 10 RT | Switching frequency programming | Resistor to SGND sets fSW; 40.2kΩ → 500kHz; open → default 500kHz; supports external clock sync. |
| 11 MODE/SYNC | Operating mode selection and clock sync input | Open = PFM; SGND = PWM; INTVCC = DCM; also accepts external clock (1.1–1.4× fSW) for system-wide timing alignment. |
| 12 EXTVCC | Auxiliary supply input | Connect to 5V output to reduce LDO losses and improve efficiency; required for max 3.5A performance at low VIN. |
| 13, 16 NC | No-connect terminals | Leave unconnected; no internal bonding or function. |
| 17–19 LX | Switching node connections | Parallel pins reduce trace inductance and conduction loss; connect directly to inductor's switch-side terminal. |
| 20 BST | Bootstrap capacitor node | 0.1μF ceramic capacitor between BST and LX supplies gate drive for high-side MOSFET. |
| EP | Exposed thermal pad | Mandatory connection to SGND with multiple thermal vias; primary heat dissipation path-critical for 2424mW power handling. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode-reduces BOM count, improves efficiency by ~5% at full load, and lowers thermal footprint. |
| Internal compensation | Removes need for external Type-II/III compensation network-simplifies design, reduces layout sensitivity, and accelerates time-to-test. |
| All-ceramic capacitor support | Enables fully ceramic input/output filtering-reducing solution size, improving reliability, and avoiding electrolytic aging or ESR drift. |
| Hiccup-mode overload protection | Shuts down on sustained overcurrent, then auto-retries-prevents thermal runaway during short-circuit events without latch-up. |
| Programmable EN/UVLO | Allows precise input voltage turn-on threshold setting via resistor divider-ensures clean power sequencing in multi-rail systems. |
| CISPR-22 Class B compliance | Validated radiated emissions meet industrial EMC requirements without additional shielding or ferrites in typical layouts. |
Applications
| Industrial Control Power Supplies | General-Purpose Point-of-Load |
|---|---|
Use Scenario: Powering PLC I/O modules, sensor signal conditioners, and isolated communication interfaces in factory automation cabinets. IC Role / Device Role / Timing Role: Primary 5V buck regulator delivering regulated power to microcontrollers, ADCs, and digital isolators. Use Value: Wide 4.5V–36V input accommodates fluctuating 24V DC bus; hiccup protection ensures uptime during field wiring faults. | Use Scenario: Local regulation for FPGA core or I/O banks on high-density PCBs where space and thermal management are constrained. IC Role / Device Role / Timing Role: Compact, high-efficiency step-down converter replacing discrete controller + external MOSFET solutions. Use Value: 20-pin TQFN package and all-ceramic design minimize footprint; 3.5A capability supports modern low-voltage, high-current loads. |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Secondary regulation stage in telecom remote radio units (RRUs) converting intermediate 12V/24V to 5V for RF front-end ICs. IC Role / Device Role / Timing Role: High-voltage input buck converter providing stable 5V under variable load and temperature conditions. Use Value: ±1.3% output accuracy and –40°C to +125°C operation ensure signal integrity across outdoor environmental extremes. | Use Scenario: Powering baseband processing units and backhaul interface circuits in 4G/5G macrocell base stations. IC Role / Device Role / Timing Role: Efficient, EMI-compliant 5V supply meeting stringent CISPR-22 Class B radiated emission limits. Use Value: External clock synchronization enables deterministic switching frequency alignment with system clocks-reducing beat frequencies and spectral peaks. |
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, 3.5A, adjustable output only; no fixed 5V variant; requires external compensation. | Automotive AEC-Q100 qualified; wider input range suits 48V systems but lacks pinout or feature parity. | Select when automotive qualification or >36V input is mandatory; expect added design effort for compensation and feedback divider. |
| TPS54560BDDAR | 4.5V–60V input, 5A, adjustable output only; no fixed 5V option; uses external MOSFETs. | Higher current rating and wider input, but requires external high-side/low-side FETs and compensation network. | Choose for >3.5A demand or when discrete FET selection is preferred; avoid if board space or BOM simplification is priority. |
Compared with LM5164QPWPRQ1 and TPS54560BDDAR, the MAX17633BATP+T offers plug-and-play 5V regulation with zero external compensation, lower quiescent current (96μA vs. 100μA+), and superior light-load efficiency via PFM/DCM modes-making it optimal for space-constrained industrial PoL designs.
Availability
MAX17633BATP+T 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 consistent parametric performance.
Supply support for MAX17633BATP+T 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, and communications markets.
The MAX17633 series belongs to Maxim's Himalaya power portfolio-engineered for cooler, smaller, and simpler DC-DC solutions in high-voltage industrial and infrastructure applications.
FAQ
What is the output voltage tolerance of the MAX17633BATP+T over temperature?
The MAX17633BATP+T guarantees ±1.3% output voltage regulation accuracy over the full operating temperature range of –40°C to +125°C ambient. This specification applies specifically to the fixed 5V output version and is confirmed in the Electrical Characteristics table under "FB Regulation Voltage" for MAX17633B variants. The tolerance includes initial accuracy, line regulation, and load regulation effects.
Does the MAX17633BATP+T require external compensation components?
No, the MAX17633BATP+T does not require external compensation components. It features built-in compensation across the entire output voltage range, which eliminates the need for external Type-II or Type-III compensation networks. This is explicitly stated in both the General Description and Detailed Description sections of the datasheet and validated through closed-loop Bode plot measurements showing stable phase margin (>67°) at 3.5A load.
Can the MAX17633BATP+T be synchronized to an external clock?
Yes, the MAX17633BATP+T 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 after detecting 16 rising edges. Synchronization is only active in PWM or DCM modes-not in PFM mode-and requires minimum pulse width >50ns and off-time ≥160ns.
What is the purpose of the EXTVCC pin on the MAX17633BATP+T?
The EXTVCC pin on the MAX17633BATP+T provides an auxiliary power input to reduce internal LDO losses and improve overall efficiency. When the output is set to 5V, connecting EXTVCC to the 5V output powers the internal gate driver and bias circuitry directly-bypassing the INTVCC LDO. This lowers power dissipation, especially at low input voltages, and helps sustain full 3.5A output capability.
How does the MAX17633BATP+T handle overcurrent conditions?
The MAX17633BATP+T employs hiccup-mode overcurrent protection. Upon detecting a runaway current exceeding 5.35A (typical), it shuts down the switching cycle, waits for thermal recovery, then attempts automatic restart. This prevents thermal damage during sustained shorts while enabling self-recovery-unlike latch-off protection. The hiccup timeout is fixed at 32768 switching cycles, and RESET asserts during fault conditions.
MAX17633BATP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 20-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX17633BATP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17633BATP+T 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+T reliable?
The price and inventory of MAX17633BATP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17633BATP+T is usually 5 days.
3.What payment methods are accepted for MAX17633BATP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17633BATP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17633BATP+T?
MAX17633BATP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17633BATP+T 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+T?
For technical support, including MAX17633BATP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17633BATP+T requirements.
6.How does Aetrix verify that MAX17633BATP+T is sourced from the original manufacturer or authorized distributors?
All MAX17633BATP+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX17633BATP+T?
All MAX17633BATP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17633BATP+T, 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+T part is unused and in its original packaging.
Return procedure for MAX17633BATP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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