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Analog Devices Inc./Maxim Integrated MAX17633AATP+
- Part No.:
- MAX17633AATP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-WFQFN Exposed Pad
- Datasheet:
-
MAX17633AATP+.pdf
- Description:
- IC REG BUCK ADJ 3.5A 20TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:446
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Product details
Overview
The MAX17633AATP+ from Maxim Integrated is a Himalaya-series synchronous step-down DC-DC converter with integrated high-side and low-side MOSFETs, delivering up to 3.5A at a fixed 3.3V output across a 4.5V–36V input range. It features peak-current-mode control, ±1.3% FB regulation accuracy over –40°C to +125°C, and operates in PWM/DCM/PFM modes for optimized efficiency. It is used in industrial control power supplies and high-voltage single-board systems.
For engineers reviewing the MAX17633AATP+ datasheet, MAX17633AATP+ pinout, MAX17633AATP+ application, or MAX17633AATP+ equivalent, key selection criteria include its 20-pin TQFN package, 3.3V fixed output, 500kHz default switching frequency, EXTVCC auxiliary supply support, and built-in hiccup-mode overload protection - all critical for robust point-of-load regulation in harsh environments.
Technical Context
The MAX17633AATP+ implements peak-current-mode control with internal transconductance error amplifier, slope compensation, and programmable soft-start via external capacitor on SS pin. Its MODE/SYNC pin selects between PWM (constant frequency), DCM (light-load discontinuous conduction), or PFM (pulse-skipping) operation - each affecting ripple, efficiency, and EMI profile.
It integrates dual nMOS power switches (RDS(ON)H = 65–125mΩ, RDS(ON)L = 40–80mΩ), a 5V INTVCC LDO, and open-drain RESET with 90.5–94.6% FB threshold assertion. The device supports external clock synchronization (1.1×–1.4× fSW) and features adjustable EN/UVLO, thermal shutdown at 165°C, and CISPR 22 Class B compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 36V - enables direct regulation from 12V/24V industrial rails or wall adapters without pre-regulation. |
| Output Voltage | Fixed 3.3V - eliminates external feedback resistors; ±1.3% regulation accuracy ensures stable MCU/I/O rail under full temperature range. |
| Max Output Current | 3.5A continuous - supports demanding SoC, FPGA, or multi-rail subsystems with margin at +125°C ambient. |
| Switching Frequency | 400kHz–2.2MHz (adjustable via RT resistor); default 500kHz - balances size (inductor/capacitor), efficiency, and EMI performance. |
| Efficiency Peak | >93% - achieved using synchronous rectification and low RDS(ON) MOSFETs, reducing heat dissipation in compact layouts. |
| Shutdown Current | 2.8μA - enables ultra-low-power standby in battery-backed or energy-sensitive applications. |
| Package | 20-pin TQFN (4mm × 4mm, exposed pad) - provides low thermal resistance (θJA = 26°C/W) for reliable operation without heatsinks. |
Pinout & Package
Package: 20-pin TQFN (4mm × 4mm) with exposed thermal pad (EP), RoHS-compliant, outline number 21-100172.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 PGND | Power ground return for high-current paths | Must connect directly to low-impedance power ground plane; multiple vias to inner layers required for thermal and EMI control. |
| 2, 3, 14 IN | Main input power supply (4.5V–36V) | Requires ≥2.2μF ceramic decoupling placed adjacent to pins; shared current path demands low-inductance layout. |
| 4 EN/UVLO | Enable and input undervoltage lockout control | Configurable turn-on threshold (1.19–1.26V rising); pull to IN for always-on, or divider for programmable UVLO. |
| 5 RESET | Open-drain fault indicator | Asserts low when FB falls below 92% of target; deasserts after 1024 cycles once FB rises above 95% - enables system reset sequencing. |
| 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 quiet analog ground plane to minimize noise coupling into FB/SS/MODE paths. |
| 8 SS | Soft-start timing input | Capacitor to SGND sets ramp time; supports monotonic startup and prebiased output voltage handling. |
| 9 FB | Feedback input (3.3V reference) | Direct connection to VOUT for fixed-output variant; internal 3.3V reference enables precise regulation without external dividers. |
| 10 RT | Switching frequency programming | Resistor to SGND sets fSW; open-circuit defaults to 500kHz - allows optimization for size vs. efficiency vs. EMI. |
| 11 MODE/SYNC | Control mode selection and clock sync | SGND = PWM, open = PFM, INTVCC = DCM; also 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; tie to SGND if unused. |
| 13, 16 NC | No-connect terminals | Leave unconnected; no internal connection - must not be routed or soldered. |
| 17–19 LX | Switch node outputs | High dv/dt node connecting to inductor; requires short, wide copper; shared pins reduce parasitic inductance. |
| 20 BST | Bootstrap capacitor connection | 0.1μF ceramic between BST and LX - essential for high-side gate drive; placement critical for reliability. |
| EP | Exposed thermal pad | Mandatory connection to SGND with ≥6 thermal vias - primary path for heat dissipation; failure causes thermal shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous rectification | Eliminates external Schottky diode; reduces conduction loss and improves light-load efficiency by >5% vs. asynchronous designs. |
| Integrated compensation | Removes need for external Type-II/III compensation network - simplifies design, saves board space, and guarantees stability across 3.3V output range. |
| Programmable EN/UVLO | Allows custom input turn-on voltage (e.g., 15V for 24V rail derating); prevents brownout during line sag without external comparators. |
| Hiccup-mode overload protection | Shuts down and auto-retries on sustained overcurrent; avoids thermal runaway while preserving downstream components during short-circuit events. |
| CISPR 22 Class B compliance | Validated radiated emissions meet commercial EMI limits without added shielding or ferrites - accelerates EMC certification. |
| Adjustable soft-start | Capacitor-controlled ramp prevents inrush current; supports prebiased output startup - critical for hot-swap and multi-rail sequencing. |
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 3.3V rail regulator delivering clean, regulated power to microcontrollers and communication peripherals. Use Value: Wide 4.5V–36V input handles bus fluctuations; hiccup protection sustains operation during transient shorts; -40°C to +125°C rating ensures reliability in uncooled enclosures. | Use Scenario: Local regulation for FPGAs, DSPs, or ASICs requiring stable 3.3V core or I/O supply on dense PCBs. IC Role / Device Role / Timing Role: Compact, high-efficiency buck converter replacing discrete solutions or older controllers with external MOSFETs. Use Value: 20-pin TQFN footprint minimizes area; all-ceramic capacitor support enables small, low-profile layout; 93% peak efficiency reduces thermal load near heat-sensitive components. |
| Distributed Supply Regulation | Base-Station Power Supplies |
Use Scenario: Secondary regulation in telecom edge equipment where 48V or 24V backplane feeds multiple localized 3.3V rails. IC Role / Device Role / Timing Role: Isolated point-of-load converter providing independent, well-regulated 3.3V domains per functional block. Use Value: External clock synchronization (MODE/SYNC) enables phase-aligned switching across multiple MAX17633AATP+ units - reducing input ripple and improving system-level EMI. | Use Scenario: Powering RF front-end ICs, transceivers, and baseband processors in 4G/5G small cells operating from 24V or 48V intermediate bus. IC Role / Device Role / Timing Role: High-voltage input buck regulator delivering low-noise 3.3V supply with fast transient response for sensitive analog circuits. Use Value: 500kHz default fSW enables use of small 6.8μH inductors; PFM/DCM modes extend battery life in backup-powered units; RESET signal enables graceful shutdown during brownout. |
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 | Automotive-grade (AEC-Q100), 3.5A, 4.5V–65V input, fixed 3.3V option available; lower peak efficiency (~91%), no EXTVCC pin. | Qualified for automotive under-hood use; lacks hiccup-mode protection and RESET output - requires external monitoring circuitry. | Select LM5164QPWPRQ1 only when AEC-Q100 qualification is mandatory and extended input range (>36V) is needed. |
| TPS54332DR | 3A, 3.5V–28V input, adjustable output only; requires external feedback resistors and compensation; no PFM/DCM modes. | Lower current rating and narrower input range limit use in 36V industrial systems; absence of integrated RESET and hiccup protection increases BOM count. | Choose TPS54332DR only for cost-sensitive, non-critical applications where 3A output suffices and external compensation is acceptable. |
Compared with LM5164QPWPRQ1 and TPS54332DR, the MAX17633AATP+ delivers higher efficiency, integrated protection features (hiccup, RESET), and flexible mode control - making it optimal for industrial and telecom point-of-load designs where reliability, thermal performance, and design simplicity are prioritized over automotive qualification or ultra-low cost.
Availability
The MAX17633AATP+ is available at Aetrix Electronics and suitable for industrial control power supplies, general-purpose point-of-load regulation, and distributed supply systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17633AATP+ 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, communications, and computing applications.
The MAX17633AATP+ belongs to the Himalaya power regulator family, engineered to deliver cooler, smaller, and simpler DC-DC solutions for high-input-voltage industrial and telecom systems.
FAQ
What is the output voltage tolerance of the MAX17633AATP+ over temperature?
The MAX17633AATP+ maintains ±1.3% feedback regulation accuracy over the full operating temperature range of –40°C to +125°C. This specification applies to the internal 3.3V reference and ensures consistent output voltage stability without external trimming, critical for powering sensitive digital logic and interface circuits across environmental extremes.
Can the MAX17633AATP+ operate with an input voltage below 4.5V?
No - the MAX17633AATP+ has a specified minimum input voltage of 4.5V. Operation below this level violates absolute maximum ratings and may result in improper startup, regulation failure, or undefined behavior. For sub-4.5V applications, consider alternative regulators such as the MAX17504 or MAX2000x series.
Does the MAX17633AATP+ support external clock synchronization?
Yes, the MAX17633AATP+ supports external clock synchronization via the MODE/SYNC pin. When an external clock signal within 1.1×–1.4× the RT-set frequency is applied, the device locks to that frequency and operates in PWM mode. Synchronization is disabled in PFM mode and requires ≥50ns pulse width and ≥160ns off-time for reliable capture.
What is the purpose of the EXTVCC pin on the MAX17633AATP+?
The EXTVCC pin on the MAX17633AATP+ accepts an external 5V supply (e.g., from the buck output) to power the internal gate driver and bias circuitry, reducing losses in the INTVCC LDO and improving overall efficiency by up to 2–3% at full load. If unused, EXTVCC must be tied to SGND - leaving it floating is not permitted.
How does the hiccup-mode overload protection work in the MAX17633AATP+?
The MAX17633AATP+ enters hiccup mode when output current exceeds the runaway limit (5.35–7.35A). It shuts down, waits for thermal recovery, then attempts restart after a timeout (32768 switching cycles). This cycle repeats until the overload clears - preventing thermal damage while enabling automatic recovery without manual intervention or system reset.
MAX17633AATP+ 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)
MAX17633AATP+ FAQ
1.How can I place an order for MAX17633AATP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17633AATP+ 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 MAX17633AATP+ reliable?
The price and inventory of MAX17633AATP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17633AATP+ is usually 5 days.
3.What payment methods are accepted for MAX17633AATP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17633AATP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17633AATP+?
MAX17633AATP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17633AATP+ 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 MAX17633AATP+?
For technical support, including MAX17633AATP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17633AATP+ requirements.
6.How does Aetrix verify that MAX17633AATP+ is sourced from the original manufacturer or authorized distributors?
All MAX17633AATP+ 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 MAX17633AATP+ meets industry standards.
7.What is the process for return or replacement of MAX17633AATP+?
All MAX17633AATP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17633AATP+, 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 MAX17633AATP+ part is unused and in its original packaging.
Return procedure for MAX17633AATP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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