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Analog Devices Inc./Maxim Integrated MAX832CWE
- Part No.:
- MAX832CWE
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX832CWE.pdf
- Description:
- IC REG BUCK 3.3V 1A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:434
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Product details
Overview
MAX832CWE from Maxim Integrated is a monolithic, bipolar, PWM step-down DC-DC regulator with fixed 3.3V output, 1A rated current, 8V–30V input range, 100kHz switching frequency, and integrated power switch in a 16-pin wide SO package-designed for high-current distributed power conversion in industrial control systems.
For engineers reviewing the MAX832CWE datasheet, MAX832CWE pinout, MAX832CWE application, or MAX832CWE equivalent, key selection criteria include fixed 3.3V output accuracy (±0.5% typ), SENSE-based feedback architecture, ILIM-adjustable current limit, micropower shutdown via SHUT pin, and thermal derating guidance for continuous 1A operation at +70°C ambient.
Technical Context
The MAX832CWE implements a classic buck topology with on-chip bipolar power switch and internal oscillator, eliminating external timing components. Its error amplifier compares SENSE voltage directly to an internal 2.21V reference, enabling precise regulation without external resistive dividers.
Current limiting is cycle-by-cycle and externally adjustable via ILIM-to-GND resistor; shutdown is TTL-compatible and asserted low on SHUT. Thermal design requires low-θJA PCB layout (55°C/W typical) due to 1W dissipation limit at TJ = +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±0.5% (typ), referenced to internal 2.21V bandgap |
| Input Voltage Range | 8V to 30V - supports unregulated industrial bus rails |
| Switching Frequency | 100kHz ±15% - enables use of standard 100µH inductors and reduces EMI filtering burden |
| Output Current | 1A continuous - derated per ambient temperature and input/output voltage per Table 2 |
| Quiescent Current | 8mA - enables efficient operation under light load without burst-mode complexity |
| Shutdown Current | 50µA max - ensures minimal standby drain when SHUT is pulled low |
| Thermal Resistance | θJA = 55°C/W - requires 1 oz. copper ground plane with thermal paste for full 1A rating |
Pinout & Package
Package: 16-pin wide SO (SOIC-W), body width 7.5mm, JEDEC MS-013AC compliant, rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pins 5,7,10,12) | Power input supply | Bypassed with ≥100µF low-ESR capacitor; supplies internal circuitry and collector of on-chip switch |
| VSW (Pins 13–16) | Switch node output | Connects to inductor and catch diode anode; rated for 1A peak, −20V swing relative to GND |
| GND (Pins 6,9) | Analog/digital reference | Low-noise, short trace connection required; internal reference and error amp referenced to this node |
| SENSE (Pin 8) | Feedback input | Direct connection to VOUT; sets regulation point at 3.3V via internal 2.21V reference |
| SHUT (Pin 11) | Enable/shutdown control | TTL-compatible input; pull ≤0.1V to disable switching and reduce IQ to 50µA |
| ILIM (Pin 1) | Current limit adjustment | Resistor to GND sets switch current limit per RLIM = 7.6kΩ × (1A/ILIM) − 1kΩ |
| VC (Pin 2) | Error amplifier output | Compensation node (RC network); clamped at −0.7V to +5.8V; can synchronize to external 115–170kHz clock |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1A bipolar switch | Eliminates external MOSFET and driver, reducing BOM count and layout area in space-constrained designs |
| Fixed 3.3V output with SENSE feedback | Removes need for external resistor divider, improving accuracy and reducing component tolerance sensitivity |
| Externally adjustable current limit | Enables safe operation across varying input/output conditions using single ILIM-to-GND resistor |
| Micropower shutdown mode | Reduces system standby power by >99% versus active mode, critical for battery-backed or energy-sensitive systems |
| 100kHz fixed-frequency PWM | Provides predictable EMI profile and simplifies filter design versus variable-frequency or hysteretic controllers |
Applications
| Industrial PLC Power Rails | Embedded Controller Core Supply |
|---|---|
Use Scenario: Providing stable 3.3V rail from 24V industrial bus to power microcontrollers and I/O drivers in programmable logic controllers. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 3.3V at up to 1A with cycle-by-cycle overcurrent protection. Use Value: Enables direct conversion from noisy 24V bus without intermediate stages, maintaining ±0.5% output accuracy over temperature and line variation. | Use Scenario: Generating core voltage for ARM Cortex-M4 microcontrollers in edge gateway devices operating from 12–28V field power. IC Role / Device Role / Timing Role: Fixed-output DC-DC converter with shutdown control synchronized to host processor sleep states. Use Value: Delivers 1A at 3.3V with 50µA shutdown current, extending battery life during deep-sleep modes while retaining fast wake-up response. |
| Test Equipment Auxiliary Supply | Motor Drive Logic Interface Rail |
Use Scenario: Powering digital logic and ADC reference circuits in portable multimeters and signal analyzers powered by rechargeable Li-ion packs (8–30V). IC Role / Device Role / Timing Role: High-efficiency buck regulator with tight line/load regulation and low noise for precision analog subsystems. Use Value: Maintains <±2mV output deviation across full 8–30V input range and 0–1A load, ensuring measurement repeatability. | Use Scenario: Supplying isolated gate driver logic and position encoder interfaces in 24V DC motor drives with transient-heavy bus conditions. IC Role / Device Role / Timing Role: Robust step-down regulator with built-in short-circuit and overcurrent fault protection. Use Value: Survives repeated motor stall events via cycle-by-cycle current limiting and recovers automatically without latch-off or reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2576-3.3 | 5-pin TO-220/TO-263; 3.3V fixed; 3A rating; 52kHz switching; requires external diode | Higher current capability but larger footprint and lower switching frequency increases inductor size | Preferred where >1A load or higher thermal margin is required and board space allows TO-220 mounting |
| TPS54331 | 8-pin SOIC; 3.3V adjustable via resistor divider; 3A rating; 570kHz switching; integrated high-side MOSFET | Higher efficiency and smaller magnetics, but requires external feedback resistors and lacks bipolar ruggedness | Selected when higher efficiency, smaller solution size, or wider input range (3.5–28V) outweighs need for fixed-output simplicity |
Compared with LM2576-3.3 and TPS54331, the MAX832CWE offers fixed 3.3V regulation without external resistors, bipolar switch ruggedness against voltage transients, and proven reliability in industrial environments-but with lower maximum current and higher quiescent current than modern CMOS alternatives.
Availability
MAX832CWE is available at Aetrix Electronics and suitable for industrial PLC power rails, embedded controller core supplies, and test equipment auxiliary supplies requiring stable component supply and long-term continuity support.
Supply support for MAX832CWE 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX830–MAX833 family was designed specifically for rugged, high-current step-down conversion in industrial environments where simplicity, thermal robustness, and bipolar switch reliability outweigh the need for ultra-high efficiency or ultra-small size.
FAQ
What is the output voltage tolerance of the MAX832CWE over temperature and line variation?
The MAX832CWE provides a fixed 3.3V output with ±0.5% typical tolerance at +25°C and ±2.0% maximum over the full 0°C to +70°C temperature range and 8V–30V input range. This specification is guaranteed by internal trimming of the 2.21V reference and matched feedback path, and does not require external resistor calibration like adjustable regulators.
Can the MAX832CWE operate from a 36V input source?
No - the MAX832CWE has an absolute maximum input voltage rating of 40V, but its recommended operating input range is strictly 8V to 30V per the datasheet. Operation above 30V risks exceeding the 50V switch-to-input voltage limit and may cause premature device failure; for 36V applications, consider the MAX86141 or other 40V-rated regulators.
How is current limiting adjusted on the MAX832CWE?
Current limiting on the MAX832CWE is adjusted by connecting a resistor (RLIM) between the ILIM pin (Pin 1) and GND. The relationship is RLIM = 7.6kΩ × (1A / ILIM) − 1kΩ. With ILIM open, the default switch current limit is ~1.7A, delivering ~1.3A continuous output at +70°C ambient.
Does the MAX832CWE require an external compensation network?
Yes - the VC pin (Pin 2) requires an external RC compensation network connected to GND to stabilize the control loop. Typical values are 10kΩ in series with 0.047µF, as shown in the "Typical Operating Circuit" diagram. Omitting or mis-sizing this network causes instability, overshoot, or oscillation under dynamic load changes.
Is the MAX832CWE pin-compatible with other members of the MAX830–MAX833 family?
Yes - all MAX830–MAX833 variants share identical 16-pin wide SO packaging and pinout, including MAX832CWE, MAX831CWE (5V), MAX833CWE (3V), and MAX830CWE (adjustable). Only the feedback configuration differs: SENSE is used directly for fixed outputs, while FB requires a resistor divider for MAX830.
MAX832CWE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 1A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX832CWE FAQ
1.How can I place an order for MAX832CWE through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX832CWE 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 MAX832CWE reliable?
The price and inventory of MAX832CWE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX832CWE is usually 5 days.
3.What payment methods are accepted for MAX832CWE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX832CWE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX832CWE?
MAX832CWE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX832CWE 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 MAX832CWE?
For technical support, including MAX832CWE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX832CWE requirements.
6.How does Aetrix verify that MAX832CWE is sourced from the original manufacturer or authorized distributors?
All MAX832CWE 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 MAX832CWE meets industry standards.
7.What is the process for return or replacement of MAX832CWE?
All MAX832CWE units undergo pre-shipment inspection (PSI). If there is an issue with MAX832CWE, 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 MAX832CWE part is unused and in its original packaging.
Return procedure for MAX832CWE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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