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Analog Devices Inc./Maxim Integrated MAX17232ETIR+
- Part No.:
- MAX17232ETIR+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
MAX17232ETIR+.pdf
- Description:
- IC REG BUCK 3.3V/5V DL 28TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,966
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Product details
Overview
MAX17232ETIR+ 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 (5V/3.3V fixed or 1V–10V adjustable). It features current-mode control, 20µA quiescent current in PFM mode, 92% peak efficiency, and 180° out-of-phase operation for reduced input ripple - used in distributed power architectures requiring compact, high-efficiency point-of-load regulation.
For engineers reviewing the MAX17232ETIR+ datasheet, MAX17232ETIR+ pinout, MAX17232ETIR+ application, or MAX17232ETIR+ equivalent, key selection criteria include its 2.2MHz max switching frequency (MAX17233 variant), 50ns minimum on-time, ±6% spread-spectrum EMI reduction, dual enable inputs (EN1/EN2), and thermal shutdown at +170°C - all validated for industrial (-40°C to +85°C) operation in TQFN-EP package.
Technical Context
The MAX17232ETIR+ implements two independent current-mode buck controllers with PWM/PGM selectable operation: PWM ensures constant-frequency switching across load conditions, while PFM disables negative inductor current and skips pulses at light loads to achieve 20µA quiescent current. Each channel supports 95% maximum duty cycle and 50ns minimum on-time, enabling low-duty-cycle operation even at 2.2MHz.
It integrates high-side (DH1/DH2) and low-side (DL1/DL2) MOSFET gate drivers with shoot-through protection, uses BIAS as internal 5V LDO (4.75V–5.25V), and supports EXTVCC switchover for reduced dissipation. Feedback regulation is referenced to 1.0V (±1%) at FB1/FB2 pins, with overvoltage protection triggered at +15% (typ) of nominal output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5V to 36V continuous, with 42V transient protection - 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 resistive divider - supports mixed-voltage SoC/FPGA power domains. |
| Switching Frequency | 220kHz to 2.2MHz (adjustable via FOSC resistor); MAX17232ETIR+ supports up to 1MHz - balances size vs. efficiency trade-offs in space-constrained designs. |
| Quiescent Current | 20µA typical in PFM mode (both channels active), 8µA in shutdown - extends battery life in always-on IoT edge nodes. |
| Thermal Protection | Thermal shutdown at +170°C with 20°C hysteresis - prevents latch-up during sustained overload or poor heatsinking. |
| EMI Reduction | ±6% spread-spectrum modulation - lowers peak radiated emissions to meet CISPR 22 Class B limits without added filtering. |
| Phase Relationship | 180° out-of-phase operation between Buck 1 and Buck 2 - cuts input capacitor RMS current by ~30% versus in-phase topology. |
Pinout & Package
MAX17232ETIR+ is housed in a 28-pin 5mm × 5mm TQFN-EP package with exposed thermal pad, rated for -40°C to +85°C ambient operation. The exposed pad must be soldered to PCB ground for optimal thermal performance (θJC = 3°C/W).
| 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 routing to inductors; serve as return rails for DH1/DH2 gate drives. |
| DH1 / DH2 | High-side nMOSFET gate drivers | Bootstrap-powered outputs swinging from LX_ to BST_; require ceramic boost capacitors (BST1/BST2) and diodes for gate charge replenishment. |
| DL1 / DL2 | Low-side nMOSFET gate drivers | BIAS-supplied outputs swinging from PGND_ to BIAS; include shoot-through protection and require external pulldown resistors during shutdown. |
| FB1 / FB2 | Voltage feedback inputs | Regulate to 1.0V (±1%) reference; connect to BIAS for fixed 5V/3.3V outputs or to resistive dividers for adjustable 1V–10V outputs. |
| CS1 / CS2 | Current-sense positive inputs | Monitor high-side current via external sense resistor; threshold is 80mV (typ) for overcurrent protection. |
| OUT1 / OUT2 | Output voltage sense / current-sense return | Provide Kelvin sensing path for output regulation; also serve as negative terminals for current-sense resistors. |
| EN1 / EN2 | Independent enable inputs | High-voltage tolerant (to +42V), active-high digital controls - allow staggered power sequencing or dynamic rail disable. |
| PGOOD1 / PGOOD2 | Open-drain power-good indicators | Assert low during soft-start, undervoltage, or fault; require external pullup (≥100Ω) to logic rail ≤5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| All-ceramic capacitor support | Enables ultra-compact layout with no electrolytic or tantalum capacitors required on input/output - improves reliability and temperature stability. |
| 180° interleaved phase operation | Reduces input ripple current amplitude and enables cascaded supply configurations without additional synchronization circuitry. |
| Simple RC compensation | Single external RC network per channel (COMP1/COMP2) provides stable loop response across full 1V–10V output range and load conditions. |
| Spread-spectrum EMI control | ±6% frequency dithering lowers peak spectral energy at fundamental and harmonics - simplifies EMC compliance testing. |
| 50ns minimum on-time guarantee | Ensures reliable PWM operation at low duty cycles (e.g., 5V out from 36V in at 2.2MHz), preventing pulse-skipping instability. |
Applications
| Distributed Supply Regulation | Wall Transformer Regulation |
|---|---|
Use Scenario: Powering multiple voltage domains (e.g., 5V microcontroller core, 3.3V I/O, 1.8V memory) from a single 24V industrial bus. IC Role / Device Role / Timing Role: Dual-buck controller providing independent, tightly regulated rails with synchronized 180° phase shift to minimize input capacitor stress. Use Value: Eliminates need for two discrete controllers; reduces board area by 40% and input ripple current by 30% versus in-phase implementation. |
Use Scenario: Replacing linear regulators in AC/DC wall adapters to improve efficiency and reduce thermal footprint. IC Role / Device Role / Timing Role: High-input-voltage synchronous buck controller converting rectified 36V DC to stable 5V/3.3V outputs with 42V transient tolerance. Use Value: Achieves >92% peak efficiency at full load, cutting adapter temperature rise by 15°C versus LDO-based solutions. |
| General-Purpose Point-of-Load | Automotive Body Control Module (BCM) |
Use Scenario: Local regulation near FPGA or ASIC with dynamic load steps and strict voltage accuracy requirements. IC Role / Device Role / Timing Role: Fast-transient-response dual buck supplying 1.2V core and 3.3V I/O with programmable soft-start (6ms typ) and PGOOD monitoring. Use Value: 200ns minimum on-time and forced-PWM mode ensure sub-10µs load-step recovery without output droop. |
Use Scenario: Power management in 12V vehicle systems where cold-crank (4.5V) and load-dump (42V) transients are common. IC Role / Device Role / Timing Role: Robust dual-output controller with 42V transient protection, UVLO (2.9V BIAS), and thermal shutdown (+170°C) for under-hood reliability. Use Value: Maintains regulation during 4.5V cold-crank events and survives 42V load-dump spikes without external TVS diodes. |
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 max switching frequency (2.2MHz vs. 1MHz), 50ns min on-time, spread-spectrum enabled - optimized for smallest passive size. | Better suited for space-constrained portable electronics; less ideal for high-efficiency 200–500kHz industrial supplies. | Select MAX17233ETIS+ when board area is critical and 2.2MHz operation is acceptable; MAX17232ETIR+ preferred for efficiency-first designs. |
| LM5143AQRHBTQ1 | Automotive-grade AEC-Q100 qualified, 65V max input, dual-channel with integrated high-side MOSFETs - higher integration but no EXTVCC switchover. | Targeted at automotive infotainment and ADAS; lacks BIAS LDO and EXTVCC flexibility for non-automotive use. | Choose LM5143AQRHBTQ1 only for AEC-Q100-compliant automotive programs; MAX17232ETIR+ offers superior light-load efficiency and design flexibility for industrial/commercial use. |
Compared with MAX17233ETIS+, MAX17232ETIR+ trades higher-frequency capability for better mid-load efficiency and simpler thermal management; versus LM5143AQRHBTQ1, it provides lower system cost and broader input voltage adaptability outside automotive qualification constraints.
Availability
MAX17232ETIR+ is available at Aetrix Electronics and suitable for distributed supply regulation, wall transformer replacement, and general-purpose point-of-load applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed -40°C to +85°C operation.
Supply support for MAX17232ETIR+ 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.
The MAX17232/MAX17233 product line delivers highly integrated dual-buck controllers targeting space- and efficiency-sensitive power systems where independent rail control, low quiescent current, and robust transient handling are essential.
FAQ
What is the maximum input voltage rating for MAX17232ETIR+?
The MAX17232ETIR+ supports continuous operation up to 36V input and withstands transient voltages up to 42V without damage or latch-up. This allows direct interface with 24V industrial buses and automotive 12V systems experiencing load-dump events, eliminating the need for external overvoltage protection components in most applications.
Does MAX17232ETIR+ support both fixed and adjustable output voltages?
Yes, MAX17232ETIR+ supports fixed 5V (Buck 1) and 3.3V (Buck 2) outputs with ±1% accuracy when FB1/FB2 are tied to BIAS. It also supports fully adjustable outputs from 1V to 10V using external resistive dividers on FB1/FB2, with regulation referenced to a precise 1.0V (±1%) internal bandgap.
How does the 180° phase shift between Buck 1 and Buck 2 benefit system design?
The 180° out-of-phase operation in MAX17232ETIR+ reduces RMS input capacitor current by approximately 30% compared to in-phase operation, allowing smaller input capacitance and lower ESR requirements. It also enables cascaded power supply configurations where Buck 2 regulates the output of Buck 1 without additional synchronization circuitry.
What is the purpose of the EXTVCC pin on MAX17232ETIR+?
The EXTVCC pin on MAX17232ETIR+ 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, as the BIAS regulator shuts down and the device draws power directly from EXTVCC when voltage exceeds 3.2V (typ).
Can MAX17232ETIR+ operate in forced-PWM mode, and how is it enabled?
Yes, MAX17232ETIR+ supports forced-PWM mode to maintain constant switching frequency under all load conditions. It is enabled by driving the FSYNC pin high (≥1.5V), which disables skip-mode zero-crossing detection and forces complementary gate drive waveforms - improving load-transient response and eliminating variable-frequency EMI concerns.
MAX17232ETIR+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-WFQFN Exposed Pad
- Packaging:
- Tube
- 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+ FAQ
1.How can I place an order for MAX17232ETIR+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX17232ETIR+ 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+ reliable?
The price and inventory of MAX17232ETIR+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX17232ETIR+ is usually 5 days.
3.What payment methods are accepted for MAX17232ETIR+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX17232ETIR+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX17232ETIR+?
MAX17232ETIR+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX17232ETIR+ 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+?
For technical support, including MAX17232ETIR+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX17232ETIR+ requirements.
6.How does Aetrix verify that MAX17232ETIR+ is sourced from the original manufacturer or authorized distributors?
All MAX17232ETIR+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX17232ETIR+?
All MAX17232ETIR+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX17232ETIR+, 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+ part is unused and in its original packaging.
Return procedure for MAX17232ETIR+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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