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Analog Devices Inc./Maxim Integrated MAX17232ETIS+
- Part No.:
- MAX17232ETIS+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17232ETIS+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,358
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Product details
Overview
MAX17232ETIS+ 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 fixed 5V/3.3V or adjustable 1V–10V outputs per channel. It features current-mode control, 180° out-of-phase operation, ±6% spread-spectrum EMI reduction, and 95% max duty cycle for dropout support - used in industrial power supplies and distributed point-of-load regulation.
For engineers reviewing the MAX17232ETIS+ datasheet, MAX17232ETIS+ pinout, MAX17232ETIS+ application, or MAX17232ETIS+ equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and switching performance, and real-world design implications for dual-rail buck implementation with low-quiescent-current operation.
Technical Context
The MAX17232ETIS+ implements two independent current-mode PWM/PFM dual-buck controllers with 180° phase shift, enabling interleaved operation that cuts input ripple by ~70% and supports cascaded supply architectures. Each channel uses external logic-level MOSFETs driven by high-side (DH1/DH2) and low-side (DL1/DL2) gate drivers with shoot-through protection and BST_ bootstrap supplies.
It integrates a 5V internal LDO (BIAS), EXTVCC switchover capability, programmable 200kHz–1MHz switching frequency via FOSC resistor, and synchronized PGOOD monitoring with 85–95% rising/falling thresholds. The device supports forced-PWM or skip-mode operation via FSYNC pin, with 50ns minimum on-time guaranteeing stable 2.2MHz-class operation at low duty cycles.
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 without pre-regulation. |
| Output Voltage Options | Fixed 5V (±1%) / 3.3V (±1%) or resistor-adjustable 1V–10V - supports mixed-voltage SoC/FPGA power domains with single IC. |
| Switching Frequency | 200kHz–1MHz (MAX17232 variant); set via external FOSC resistor - balances efficiency vs. size: 200kHz for >92% peak efficiency, 1MHz for minimal inductor/capacitor footprint. |
| Quiescent Current | 20µA typical in PFM mode (one channel active); 8µA in shutdown - extends battery life in always-on IoT edge nodes and standby systems. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis - ensures safe operation under sustained overload or poor PCB heatsinking. |
| EMI Reduction | ±6% spread-spectrum dithering - lowers peak radiated emissions at fundamental and harmonics, easing CISPR-32 Class B compliance. |
| Power-Good Accuracy | PGOOD1/PGOOD2 assert at 85–95% of nominal output - provides reliable sequencing feedback for downstream processors and FPGAs. |
Pinout & Package
MAX17232ETIS+ is housed in a 28-pin TQFN-EP (5mm × 5mm, 0.5mm pitch) with exposed thermal pad. The package supports ≤35°C/W junction-to-ambient thermal resistance on a 4-layer board and requires soldering per JEDEC J-STD-020 reflow profile (peak 260°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1, LX2 | Switch-node connections for Buck 1 and Buck 2 | High dv/dt nodes requiring short, low-inductance PCB routing to minimize EMI and gate-drive instability. |
| DH1, DH2 | High-side nMOSFET gate drivers | Bootstrap-powered (BST1/BST2); require ceramic boost capacitors and diodes - enable efficient high-side switching up to 95% duty cycle. |
| DL1, DL2 | Low-side nMOSFET gate drivers | BIAS-supplied; include shoot-through protection - prevent cross-conduction during dead-time transitions. |
| FB1, FB2 | Voltage feedback inputs | Regulate to 1.0V (typ); connect to BIAS for fixed 5V/3.3V or resistive divider for adjustable outputs - define output accuracy and load regulation. |
| CS1, CS2 | Current-sense positive inputs | Monitor inductor DCR or shunt resistor voltage; trigger 64–96mV overcurrent limit - enable precise cycle-by-cycle current limiting. |
| PGOOD1, PGOOD2 | Open-drain power-good indicators | Assert low during soft-start, undervoltage, or fault; require external pull-up - provide system-level rail monitoring and sequencing control. |
| FSYNC | External clock synchronization input | Accepts 240kHz–1.2MHz square wave; resets internal oscillator on rising edge - enables multi-phase synchronization across multiple ICs. |
| EN1, EN2 | Independent high-voltage enable inputs | Tolerant to 42V; active-high logic - allow staggered startup, power sequencing, and dynamic rail enable/disable in complex systems. |
Key Features
| Feature | Design Value |
|---|---|
| 180° out-of-phase dual-buck operation | Reduces input capacitor RMS current by ~70%, enabling smaller bulk capacitance and lower ESR requirements in compact designs. |
| 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 iterative tuning - accelerates prototype validation. |
| 50ns minimum on-time guarantee | Supports high-frequency operation (up to 1MHz) even at ultra-low duty cycles (e.g., 5V→1.2V conversion), preserving regulation margin. |
| 42V transient input protection | Withstands load-dump events in automotive and industrial 24V systems without external TVS clamping - reduces BOM count and layout area. |
| 8μA shutdown current | Enables true zero-power standby in battery-backed systems - critical for energy harvesting and long-life remote sensors. |
Applications
| Industrial PLC Power Rails | Automotive Body Control Module (BCM) |
|---|---|
|
Use Scenario: Dual-rail power for microcontroller (3.3V), CAN transceiver (5V), and sensor interface (adjustable 1.8V–3.3V) in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Dual synchronous buck controller providing isolated, sequenced, and monitored 3.3V/5V outputs with PGOOD signaling for MCU reset coordination. Use Value: Eliminates need for two discrete controllers; 180° interleaving cuts input ripple, reducing EMI filter size by 40% versus single-phase solutions. |
Use Scenario: Power management for BCM ECU handling door locks, lighting, and LIN bus - operating from 9V–16V battery with 42V load-dump tolerance. IC Role / Device Role / Timing Role: Primary DC-DC controller generating regulated 5V for microcontroller and 3.3V for communication ICs, with EXTVCC switchover to improve light-load efficiency. Use Value: 20µA quiescent current in PFM mode extends battery life during vehicle sleep mode; spread-spectrum reduces radiated emissions near AM radio band. |
| IoT Edge Gateway Power | FPGA Core & I/O Bank Supply |
|
Use Scenario: Compact gateway powering ARM Cortex-A processor (1.1V core), DDR3 memory (1.5V), and wireless module (3.3V) from 12V PoE input. IC Role / Device Role / Timing Role: Dual adjustable buck controller delivering precise, independently enabled 1.1V and 3.3V rails with soft-start ramp control and PGOOD sequencing. Use Value: Resistor-programmable outputs eliminate trimming components; 6ms soft-start prevents inrush current tripping upstream PoE PSE detection. |
Use Scenario: FPGA power delivery where core voltage (0.85V–1.2V) and I/O banks (1.8V/2.5V/3.3V) require tight regulation, fast transient response, and rail sequencing. IC Role / Device Role / Timing Role: Dual-channel buck controller with independent EN1/EN2 enables precise power-up order; COMP1/COMP2 RC networks optimize loop stability per rail. Use Value: 50ns min on-time supports high-frequency, low-duty-cycle core rail generation; current-mode control delivers <10µs load transient recovery. |
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 |
|---|---|---|---|
| MAX17233ETIS+ | Higher-frequency variant: 1MHz–2.2MHz switching range; same pinout, package, and feature set - differs only in oscillator range and default spread-spectrum enablement. | Preferred for space-constrained designs requiring smallest magnetics; less optimal for ultra-high-efficiency 24V→5V conversion where 200kHz–500kHz yields better thermal performance. | Select MAX17233ETIS+ when board area is critical and EMI filtering must target higher frequencies; otherwise, MAX17232ETIS+ offers superior light-load efficiency below 500kHz. |
| TPS544B20RTWR | Single-channel 4A buck converter with PMBus interface; no dual-output or interleaving; requires external compensation; no spread-spectrum or EXTVCC switchover. | Suitable for simpler single-rail applications; lacks independent enable/control per channel and PGOOD monitoring for second rail. | Choose only if system needs digital telemetry or single-rail simplicity; not a functional replacement for dual-rail, sequenced, or low-IQ requirements met by MAX17232ETIS+. |
Compared with MAX17233ETIS+, MAX17232ETIS+ trades maximum switching frequency for improved light-load efficiency and lower EMI at sub-1MHz operation; versus TPS544B20RTWR, it delivers true dual-rail independence, built-in sequencing, and 8µA shutdown - making it uniquely suited for compact, low-power, multi-rail embedded systems.
Availability
MAX17232ETIS+ is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and IoT edge gateway designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX17232ETIS+ 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 demanding industrial, automotive, and communications applications - emphasizing reliability, integration, and low-power innovation.
The MAX17232/MAX17233 product line targets compact, high-efficiency dual-rail DC-DC conversion in space- and power-constrained systems - specifically engineered for distributed point-of-load regulation with minimal external components and robust fault protection.
FAQ
What is the maximum output current supported by MAX17232ETIS+?
MAX17232ETIS+ is a controller IC - it does not integrate power MOSFETs and therefore does not specify a fixed maximum output current. Instead, it drives external logic-level nMOSFETs; output current is determined by selected MOSFETs, inductors, and thermal design. The datasheet states each buck channel can support up to 10A output current with appropriate external components and PCB layout.
Does MAX17232ETIS+ support both PWM and PFM modes, and how is mode selection controlled?
Yes, MAX17232ETIS+ supports both PWM and PFM (skip) modes. Mode selection is controlled via the FSYNC pin: driving FSYNC low enables PFM mode (disabling negative inductor current and pulse-skipping at light loads), while driving FSYNC high forces continuous PWM operation. This allows designers to optimize for efficiency (PFM) or EMI/load-transient performance (PWM) per application requirement.
Can MAX17232ETIS+ generate non-standard output voltages like 1.8V or 2.5V?
Yes, MAX17232ETIS+ supports adjustable output voltages from 1V to 10V per channel using external resistive dividers on FB1 and FB2 pins. For example, a 1.8V output is achieved by setting the FB1 divider ratio so that 1.8V at OUT1 produces 1.0V at FB1. The device regulates FBx to 1.0V (typ), ensuring ±1% accuracy across the full range when properly compensated.
What is the purpose of the EXTVCC pin on MAX17232ETIS+, and when should it be used?
The EXTVCC pin on MAX17232ETIS+ allows bypassing the internal 5V BIAS LDO by connecting an external 3.1V–5.2V supply (e.g., one of the buck outputs). This reduces internal power dissipation and improves light-load efficiency. Use EXTVCC when the main buck output (e.g., 5V rail) is stable and capable of powering the IC - the device automatically switches back to BIAS if EXTVCC drops below 3.0V.
How does the 180° phase shift between the two buck channels benefit system design?
The 180° phase shift between Buck 1 and Buck 2 in MAX17232ETIS+ causes their input current ripples to cancel, reducing total RMS input capacitor current by up to 70%. This enables smaller, lower-ESR input capacitors, lowers conducted EMI, and allows cascading of outputs (e.g., Buck 2 fed from Buck 1) without compounding ripple - directly improving power density and EMC performance.
MAX17232ETIS+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX17232ETIS+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17232ETIS+ 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+ reliable?
The price and inventory of MAX17232ETIS+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17232ETIS+ is usually 5 days.
3.What payment methods are accepted for MAX17232ETIS+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17232ETIS+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17232ETIS+?
MAX17232ETIS+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17232ETIS+ 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+?
For technical support, including MAX17232ETIS+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17232ETIS+ requirements.
6.How does Aetrix verify that MAX17232ETIS+ is sourced from the original manufacturer or authorized distributors?
All MAX17232ETIS+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17232ETIS+?
All MAX17232ETIS+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17232ETIS+, 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+ part is unused and in its original packaging.
Return procedure for MAX17232ETIS+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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