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Analog Devices Inc./Maxim Integrated MAX17232ETIR+T
- Part No.:
- MAX17232ETIR+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17232ETIR+T.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,159
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Product details
Overview
MAX17232ETIR+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 independently regulated outputs (fixed 5V/3.3V or adjustable 1V–10V). It features 2.2MHz max switching frequency, 95% max duty cycle, 20µA quiescent current in PFM mode, and 42V transient protection - designed for compact, high-efficiency point-of-load regulation in industrial power systems.
For engineers reviewing the MAX17232ETIR+T datasheet, MAX17232ETIR+T pinout, MAX17232ETIR+T application, or MAX17232ETIR+T equivalent, key selection criteria include dual-buck interleaving capability, 180° phase shift for ripple reduction, spread-spectrum EMI control, external frequency synchronization (FSYNC), and dual enable inputs (EN1/EN2) for independent power sequencing.
Technical Context
The MAX17232ETIR+T implements current-mode PWM/PSM control with independent error amplifiers (COMP1/COMP2), 180° out-of-phase operation between buck channels, and dual gate drivers (DH1/DL1, DH2/DL2) supporting external logic-level MOSFETs. Its architecture enables stable all-ceramic capacitor designs and supports lossless DCR current sensing.
It integrates a 5V internal LDO (BIAS) with 100mA sourcing capability, EXTVCC switchover for efficiency optimization, and comprehensive protection including cycle-by-cycle current limiting, thermal shutdown at +170°C, and ±15% output overvoltage detection via FB1/FB2 pins.
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 and automotive battery inputs. |
| Switching Frequency | 220kHz to 2.2MHz (adjustable via FOSC resistor); supports external sync (FSYNC) - allows EMI tuning and noise-sensitive system coordination. |
| Output Voltage Options | Fixed 5V (±1%) / 3.3V (±1%) or 1V–10V adjustable via resistive divider - supports mixed-voltage SoC and FPGA power domains. |
| Quiescent Current | 20µA typical in PFM mode; 8µA in shutdown - extends battery life in always-on subsystems and low-power standby states. |
| Efficiency | 92% peak efficiency at full load - reduces thermal load and enables compact PCB layouts without heatsinks. |
| Phase Relationship | 180° out-of-phase operation between Buck 1 and Buck 2 - cuts input ripple current by ~70%, easing input capacitor sizing. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis - ensures robust operation under sustained overload or poor airflow conditions. |
Pinout & Package
MAX17232ETIR+T is housed in a 28-pin 5mm × 5mm TQFN-EP package with exposed pad for enhanced thermal dissipation. The package is rated for -40°C to +85°C ambient operation and features 35°C/W junction-to-ambient thermal resistance (θJA).
| 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 shoot-through risk and EMI. |
| DH1, DH2 | High-side gate drive outputs | Provide bootstrapped gate voltage (VLX to VBST) to turn on external nMOSFETs; support fast switching up to 2.2MHz. |
| DL1, DL2 | Low-side gate drive outputs | Drive external nMOSFET gates from BIAS rail; include shoot-through protection circuitry tied to gate-source monitoring. |
| FB1, FB2 | Feedback inputs for output regulation | Regulate to 1.0V typical reference; accept fixed 5V/3.3V (via BIAS) or adjustable 1V–10V (via resistive divider) configurations. |
| CS1, CS2 | Current-sense positive inputs | Enable accurate cycle-by-cycle current limiting using external shunt or DCR sensing; threshold = 64–96mV. |
| PGOOD1, PGOOD2 | Open-drain power-good status outputs | Assert low during soft-start, fault, or undervoltage; require external pull-up; monitor ±10–15% output deviation. |
| EN1, EN2 | Independent active-high enable inputs | High-voltage tolerant (to +42V); allow flexible power sequencing - e.g., enable Buck 2 before Buck 1 for cascaded supplies. |
| FSYNC | External clock synchronization input | Accepts 240kHz–2.4MHz square wave; resets internal oscillator on rising edge; disables spread spectrum when active. |
Key Features
| Feature | Design Value |
|---|---|
| 180° interleaved dual-buck operation | Reduces input RMS ripple current by ~70%, enabling smaller input capacitors and lower EMI filter cost. |
| Spread-spectrum modulation (±6%) | Spreads switching energy across frequency band to lower peak EMI emissions - simplifies compliance with CISPR 22/32 Class B limits. |
| All-ceramic capacitor support | Eliminates need for electrolytic or tantalum output caps; improves reliability, lifetime, and temperature stability in harsh environments. |
| Simple RC compensation (COMP1/COMP2) | Enables stable loop response across full 1V–10V output range without complex type-II/type-III networks. |
| EXTVCC switchover capability | Allows bypassing internal BIAS LDO with external 3.1V–5.2V supply - reduces internal power dissipation and improves light-load efficiency. |
| 50ns minimum on-time (typ) | Supports high-frequency operation (2.2MHz) at low duty cycles - essential for 12V→1.2V conversion with tight regulation. |
Applications
| Industrial PLC Power Distribution | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Distributed 5V and 3.3V rails powering microcontrollers, CAN transceivers, and sensor interfaces within DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual-buck controller providing independent, sequenced, and monitored power domains with PGOOD signaling for system health reporting. Use Value: 42V transient tolerance withstands load-dump events; 20µA PFM quiescent current meets ISO 16750-2 sleep-mode requirements. |
Use Scenario: Compact dual-rail supply for infotainment head-unit MCU and display backlight driver ICs in space-constrained dashboards. IC Role / Device Role / Timing Role: Synchronous dual buck managing isolated 5V logic and 3.3V I/O domains with 180° phase shift to suppress conducted EMI into AM radio band. Use Value: Spread-spectrum control reduces peak radiated emissions; TQFN-EP package enables thermal performance in sealed enclosures. |
| Medical Point-of-Care Diagnostic Instrument | Networking Edge Router PoE Interface |
Use Scenario: Battery-backed portable analyzer requiring ultra-low standby current and precise 3.3V/5V rails for ADCs, op-amps, and wireless modules. IC Role / Device Role / Timing Role: Dual-output regulator with independent EN1/EN2 enabling selective power gating of subsystems during deep-sleep modes. Use Value: 8µA shutdown current extends battery runtime; ±1% output accuracy ensures sensor signal integrity and calibration stability. |
Use Scenario: Secondary-side DC-DC stage converting PoE-derived 48V to 5V/3.3V for switch ASICs and PHYs in IEEE 802.3af/at-compliant equipment. IC Role / Device Role / Timing Role: High-input-voltage dual buck controller handling wide VIN range (3.5V–36V) while rejecting PoE surge transients. Use Value: 95% max duty cycle supports dropout operation during brownout; thermal shutdown protects against PoE cable overheating faults. |
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 (Monolithic Power Systems) | Single-channel, 3A integrated buck; no dual output, no FSYNC, no spread spectrum | Suitable only for single-rail applications; lacks interleaving and PGOOD monitoring | Select when only one regulated rail is needed and board space is extremely constrained. |
| LM5143AQDQRQ1 (Texas Instruments) | Automotive-grade dual buck controller; 4.5V–60V input; supports 180° phase shift but no integrated BIAS LDO | Requires external bias supply; higher VIN range targets 48V truck systems; AEC-Q100 qualified | Choose for automotive under-hood use where extended temperature and qualification are mandatory. |
Compared with MP2491DS-LF-Z and LM5143AQDQRQ1, the MAX17232ETIR+T uniquely combines dual independent buck control, integrated 5V BIAS LDO, spread-spectrum EMI reduction, and 20µA PFM quiescent current - making it optimal for space- and efficiency-sensitive industrial and medical point-of-load designs.
Availability
MAX17232ETIR+T is available at Aetrix Electronics and suitable for industrial PLC power distribution, automotive body control modules, medical diagnostic instruments, and networking edge router PoE interfaces requiring stable component supply and long-term lifecycle support.
Supply support for MAX17232ETIR+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX17232ETIR+T belongs to Maxim's high-efficiency dual-buck controller product line, engineered for compact, low-noise, and thermally robust point-of-load regulation in systems demanding multiple independent voltage rails.
FAQ
What is the maximum supported switching frequency for MAX17232ETIR+T?
The MAX17232ETIR+T supports an internal switching frequency range of 220kHz to 2.2MHz, set by an external resistor on the FOSC pin. It also accepts external synchronization via the FSYNC pin up to 2.4MHz. At 2.2MHz, its 50ns minimum on-time enables high-step-down ratios like 12V-to-1.2V while maintaining PWM stability - a key capability confirmed in the device's Electrical Characteristics table and Typical Operating Characteristics (TOC10).
Does MAX17232ETIR+T support both fixed and adjustable output voltages?
Yes, MAX17232ETIR+T supports fixed 5V (Buck 1) and 3.3V (Buck 2) outputs with ±1% accuracy when FB1/FB2 are tied to the internal BIAS rail. It also supports fully adjustable outputs from 1V to 10V per channel using external resistive dividers - with FB1 and FB2 regulating to a precise 1.0V (±1%) reference, as specified in the Electrical Characteristics table under "Regulated Feedback Voltage".
How does the MAX17232ETIR+T achieve low EMI performance?
The MAX17232ETIR+T achieves low EMI through three integrated techniques: 180° interleaved operation reducing input ripple, spread-spectrum modulation (±6% dithering) lowering peak spectral energy, and optimized gate driver timing with shoot-through protection. These features are validated in the Typical Operating Characteristics (TOC25–TOC27), which show measured spectral energy density reductions across 1–2.2MHz bands - directly supporting CISPR-compliant designs.
What thermal protection mechanisms are built into MAX17232ETIR+T?
MAX17232ETIR+T includes cycle-by-cycle current limiting, thermal shutdown at +170°C (with 20°C hysteresis), and input overvoltage/undervoltage lockout. Its TQFN-EP package delivers 3°C/W junction-to-case thermal resistance, and the exposed pad must be soldered to a thermal pad for effective heat transfer. These protections are documented in Absolute Maximum Ratings and Electrical Characteristics sections, ensuring reliable operation under overload or poor ventilation.
Can MAX17232ETIR+T operate with only one buck channel enabled?
Yes, MAX17232ETIR+T supports independent channel control via EN1 and EN2. Either buck can be disabled while the other remains active - for example, enabling only Buck 2 yields 20µA typical quiescent current in PFM mode. This capability is explicitly stated in the Detailed Description section and verified in the Typical Operating Characteristics (TOC03), confirming true per-channel power gating without cross-talk or instability.
MAX17232ETIR+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:
- Active
- 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)
MAX17232ETIR+T FAQ
1.How can I place an order for MAX17232ETIR+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17232ETIR+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 MAX17232ETIR+T reliable?
The price and inventory of MAX17232ETIR+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17232ETIR+T is usually 5 days.
3.What payment methods are accepted for MAX17232ETIR+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17232ETIR+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17232ETIR+T?
MAX17232ETIR+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17232ETIR+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 MAX17232ETIR+T?
For technical support, including MAX17232ETIR+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17232ETIR+T requirements.
6.How does Aetrix verify that MAX17232ETIR+T is sourced from the original manufacturer or authorized distributors?
All MAX17232ETIR+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 MAX17232ETIR+T meets industry standards.
7.What is the process for return or replacement of MAX17232ETIR+T?
All MAX17232ETIR+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX17232ETIR+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 MAX17232ETIR+T part is unused and in its original packaging.
Return procedure for MAX17232ETIR+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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