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Analog Devices Inc./Maxim Integrated MAX17232ETIS+T
- Part No.:
- MAX17232ETIS+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17232ETIS+T.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,054
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Product details
Overview
MAX17232ETIS+T from Maxim Integrated is a dual synchronous step-down DC-DC controller with integrated gate drivers, operating from 3.5V to 36V input and delivering two independent regulated outputs (5V/3.3V fixed or 1V–10V adjustable). It features current-mode control, 220kHz–2.2MHz adjustable switching frequency, 95% max duty cycle for dropout operation, and 20µA quiescent current in PFM mode - used in industrial power distribution and wall-adapter-based point-of-load regulation.
For engineers reviewing the MAX17232ETIS+T datasheet, MAX17232ETIS+T pinout, MAX17232ETIS+T application, or MAX17232ETIS+T equivalent, key selection criteria include dual-buck interleaving capability, 180° phase shift for ripple reduction, spread-spectrum EMI control, EXTVCC switchover support, and ±1% output voltage accuracy at 5V/3.3V fixed modes.
Technical Context
The MAX17232ETIS+T implements two independent current-mode PWM/PFM buck controllers with separate EN1/EN2 enables, COMP1/COMP2 compensation nodes, and 180° out-of-phase operation to minimize input ripple. Each channel supports DCR or shunt-based current sensing, cycle-by-cycle overcurrent protection via CS1/CS2, and programmable soft-start (6ms typical).
It integrates high-side (DH1/DH2) and low-side (DL1/DL2) MOSFET gate drivers with shoot-through protection, BST1/BST2 bootstrap supplies, and internal 5V BIAS LDO (6.8µF bypass required). Spread-spectrum dithering (±6%) is enabled by default and disabled when FSYNC is driven externally.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous; withstands 42V transients - enables direct connection to 24V industrial rails or automotive battery inputs without external clamping. |
| Output Voltage Options | Fixed 5V (±1%) and 3.3V (±1%) or adjustable 1V–10V via FB1/FB2 resistive dividers - supports mixed-voltage SoC or FPGA power domains. |
| Switching Frequency | 220kHz–2.2MHz (adjustable via FOSC resistor); 180° phase shift between channels - reduces input capacitor RMS current and enables compact magnetics. |
| Quiescent Current | 20µA typical in PFM mode with one channel active - extends battery life in always-on subsystems like IoT sensor hubs. |
| Efficiency | 92% peak efficiency at full load - achieved via low-RDS(on) external MOSFETs and synchronous rectification, minimizing conduction losses. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking conditions. |
| EMI Reduction | Spread-spectrum modulation (±6%) on switching frequency - lowers peak radiated emissions to meet CISPR 22 Class B limits without added filtering. |
Pinout & Package
MAX17232ETIS+T is housed in a 28-pin TQFN-EP (5mm × 5mm) package with exposed thermal pad. The package supports high-power dissipation (θJA = 35°C/W) and requires soldering to a thermally enhanced PCB ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Switch-node connections for Buck 1 and Buck 2 | Drive external high-side MOSFET sources; require low-inductance layout to minimize ringing and EMI. |
| DH1, DH2 | High-side gate drive outputs | Provide bootstrapped gate voltage (VLX to VBST) to turn on n-channel high-side MOSFETs. |
| DL1, DL2 | Low-side gate drive outputs | Swing from PGND to BIAS (5V) to drive n-channel low-side MOSFET gates with shoot-through protection. |
| FB1, FB2 | Feedback inputs | Regulate to 1.0V (typ); connect to BIAS for fixed 5V/3.3V outputs or to resistive dividers for adjustable 1V–10V range. |
| CS1, CS2 | Current-sense positive inputs | Monitor inductor current via external sense resistor or DCR network for cycle-by-cycle overcurrent limiting. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low during startup, fault, or undervoltage; require external pull-up to logic rail ≤5.5V for system sequencing. |
| FSYNC | External synchronization input | Accepts 240kHz–2.4MHz clock; resets internal oscillator on rising edge - enables multi-phase synchronization across boards. |
| EXTVCC | External bias supply input | Accepts 3.1V–5.2V to disable internal BIAS LDO and reduce power dissipation - improves light-load efficiency. |
Key Features
| Feature | Design Value |
|---|---|
| 180° interleaved operation | Reduces input ripple current by ~70% vs. parallel non-interleaved converters - allows smaller input capacitors and lower EMI filter cost. |
| All-ceramic capacitor support | Stable operation with only ceramic output caps - eliminates bulk electrolytics, improving reliability and temperature performance. |
| Simple RC compensation | Single-pole compensation via COMP1/COMP2 pins - avoids complex Type-II/III networks and simplifies loop stability across 1V–10V output range. |
| Power-OK monitoring | Independent PGOOD1/PGOOD2 with 85–95% rising/falling thresholds - enables precise power-rail sequencing in multi-rail systems. |
| Ultra-low shutdown current | 8µA typical total supply current with both EN1 and EN2 low - critical for battery-backed real-time clocks or security modules. |
Applications
| Industrial Power Distribution | Wall Adapter Point-of-Load |
|---|---|
Use Scenario: Distributed 24V-to-5V/3.3V conversion in PLC I/O modules with space-constrained PCBs. IC Role / Device Role / Timing Role: Dual-buck controller managing two independent downstream rails with interleaved switching and coordinated soft-start. Use Value: 180° phase shift cuts input capacitor RMS current by >65%, enabling 1210-size ceramics instead of larger 2220 parts. |
Use Scenario: Compact AC/DC adapter powering USB-C PD sink + microcontroller subsystem. IC Role / Device Role / Timing Role: Primary DC-DC controller generating isolated 5V bus and auxiliary 3.3V logic rail from unregulated 12V intermediate bus. Use Value: 20µA PFM quiescent current extends standby time in energy-harvesting adapters compliant with EU CoC Tier 2. |
| FPGA Core & I/O Supply | Automotive Body Control Module |
Use Scenario: Dual-rail power for FPGA core (1.0V) and I/O banks (3.3V) with tight transient response requirements. IC Role / Device Role / Timing Role: Adjustable-output buck controller with fast load-transient recovery via forced-PWM mode (FSYNC high). Use Value: 50ns minimum on-time supports 1.0V @ 2.2MHz operation - maintains regulation under high di/dt loads without pulse-skipping artifacts. |
Use Scenario: 12V battery-powered body control unit requiring robust 5V MCU rail and 3.3V CAN transceiver rail. IC Role / Device Role / Timing Role: Dual buck controller with 42V transient protection, thermal shutdown, and UVLO on BIAS/EXTVCC inputs. Use Value: Withstands load-dump events up to 42V without external TVS - eliminates discrete clamp components and saves board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual synchronous buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2491DS-LF-Z | Single-channel, 4.5V–36V input, fixed 5V/3.3V outputs; no FSYNC or spread-spectrum; 30µA IQ in skip mode | Lacks dual independent control, phase shift, or EXTVCC switchover - suitable only for single-rail designs | Select when only one regulated output is needed and EMI requirements are moderate. |
| LM5143AQDNTQ1 | Automotive-grade dual buck controller (AEC-Q100), 4.5V–60V input, 100kHz–2.2MHz freq, no integrated gate drivers (external drivers required) | Requires external high-current gate drivers and additional layout area; supports higher VIN but adds BOM cost | Select for automotive under-hood applications requiring AEC-Q100 qualification and >36V input tolerance. |
Compared with MP2491DS-LF-Z and LM5143AQDNTQ1, the MAX17232ETIS+T uniquely combines dual-channel integration, 180° interleaving, spread-spectrum EMI reduction, and ultra-low 20µA PFM quiescent current - making it optimal for space- and efficiency-sensitive industrial and consumer point-of-load systems.
Availability
MAX17232ETIS+T is available at Aetrix Electronics and suitable for industrial power distribution, wall-adapter point-of-load regulation, and FPGA/microcontroller dual-rail supply applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX17232ETIS+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, communications, and computing markets - emphasizing high integration, reliability, and low-power operation.
The MAX17232 series targets high-density, low-quiescent-current dual-buck power conversion in space-constrained applications such as programmable logic controllers, smart sensors, and portable instrumentation - where interleaving, EMI control, and flexible output configuration are critical.
FAQ
What is the maximum duty cycle supported by the MAX17232ETIS+T?
The MAX17232ETIS+T supports up to 95% maximum duty cycle, enabling operation in dropout conditions where input voltage approaches the output voltage. This allows reliable regulation down to VIN ≈ VOUT / 0.95 - for example, maintaining 5V output with as little as 5.26V input. The 95% limit ensures sufficient off-time for bootstrap capacitor recharge in high-side gate drive circuits.
Does the MAX17232ETIS+T support external synchronization, and what are the valid FSYNC frequency ranges?
Yes, the MAX17232ETIS+T supports external clock synchronization via the FSYNC pin. For stable operation, FSYNC must be set between 110% and 150% of the internal switching frequency. Valid ranges are 240kHz–1.2MHz for MAX17232 variants and 1.2MHz–2.4MHz for MAX17233 variants. A minimum pulse width of 400ns (MAX17232) or 100ns (MAX17233) is required for reliable edge detection.
How does the EXTVCC feature improve efficiency in the MAX17232ETIS+T?
The EXTVCC input allows bypassing the internal 5V BIAS LDO by supplying an external 3.1V–5.2V rail - reducing internal power dissipation and scaling quiescent current with duty cycle. When EXTVCC is active, the BIAS LDO shuts down, eliminating its 5mA–50mA static current draw and improving light-load efficiency by up to 8% in PFM mode, especially beneficial in battery-powered applications.
Can the MAX17232ETIS+T operate with only ceramic output capacitors?
Yes, the MAX17232ETIS+T is fully compatible with all-ceramic output capacitor solutions. Its current-mode control architecture and internal compensation design ensure stability across the full 1V–10V output range using only low-ESR ceramic capacitors - eliminating the need for bulk aluminum electrolytics and improving reliability, temperature stability, and board-level lifetime.
What protection features are integrated into the MAX17232ETIS+T?
The MAX17232ETIS+T integrates cycle-by-cycle current limiting (via CS1/CS2), thermal shutdown (+170°C with 20°C hysteresis), input overvoltage/undervoltage lockout (on IN and BIAS), power-good monitoring (PGOOD1/PGOOD2), and spread-spectrum EMI reduction. It also includes shoot-through protection in gate drivers and minimum on-time control (50ns) to prevent sub-cycle switching anomalies.
MAX17232ETIS+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V, 5V
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- 200kHz ~ 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-TQFN (4x4)
MAX17232ETIS+T FAQ
1.How can I place an order for MAX17232ETIS+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17232ETIS+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 MAX17232ETIS+T reliable?
The price and inventory of MAX17232ETIS+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17232ETIS+T is usually 5 days.
3.What payment methods are accepted for MAX17232ETIS+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17232ETIS+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17232ETIS+T?
MAX17232ETIS+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17232ETIS+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 MAX17232ETIS+T?
For technical support, including MAX17232ETIS+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17232ETIS+T requirements.
6.How does Aetrix verify that MAX17232ETIS+T is sourced from the original manufacturer or authorized distributors?
All MAX17232ETIS+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 MAX17232ETIS+T meets industry standards.
7.What is the process for return or replacement of MAX17232ETIS+T?
All MAX17232ETIS+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17232ETIS+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 MAX17232ETIS+T part is unused and in its original packaging.
Return procedure for MAX17232ETIS+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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