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Analog Devices Inc./Maxim Integrated MAX750AESA+T
- Part No.:
- MAX750AESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX750AESA+T.pdf
- Description:
- IC REG BUCK ADJ 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,277
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Product details
Overview
MAX750AESA+T from Maxim Integrated is an adjustable-output, step-down DC-DC switching regulator with current-mode PWM control. It operates from 4V to 11V input, delivers up to 450mA output current, features 160kHz fixed-frequency switching, 85–90% typical efficiency, and ±4.5% output voltage accuracy over line/load/temperature. It is used in portable instrumentation requiring compact, efficient local power conversion.
For engineers reviewing the MAX750AESA+T datasheet, MAX750AESA+T pinout, MAX750AESA+T application, or MAX750AESA+T equivalent, key selection criteria include input voltage range (4–11V), output current capability (450mA), shutdown current (6µA), soft-start programmability, and SO-8 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The MAX750AESA+T implements a current-mode PWM buck regulator architecture with inner current-loop sensing and outer voltage-loop error amplification. It integrates a P-channel power MOSFET switch, 1.22V bandgap reference, oscillator, soft-start clamp, and undervoltage lockout circuitry.
It supports continuous or discontinuous conduction mode depending on input/output voltage, load, and inductor value. Protection features include cycle-by-cycle current limiting, overcurrent shutdown (≈1.5A peak), soft-start-initiated recovery after fault, and UVLO with 3.75V turn-on / 3.50V turn-off thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 11.0V - defines compatible battery or unregulated supply sources (e.g., single Li-ion or 3×AA) |
| Output Current | Up to 450mA - sufficient for powering microcontrollers, sensors, and analog front-ends in portable systems |
| Switching Frequency | 160kHz - enables use of small external inductors (e.g., 33µH or 100µH) and simplifies EMI filtering |
| Efficiency | 85% to 90% at typical loads - minimizes thermal rise and extends battery life in space-constrained designs |
| Quiescent Current | 1.7mA (active), 6µA (shutdown) - critical for low-power sleep modes in battery-operated equipment |
| Output Voltage Accuracy | ±4.5% plus feedback resistor tolerance - ensures stable regulation across –40°C to +85°C operating range |
| Reference Voltage | 1.22V (typical) - sets feedback divider ratio for adjustable output from 1.25V to VIN |
Pinout & Package
MAX750AESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with dimensions 4.90mm × 3.90mm × 1.75mm (JEDEC MS-012). Thermal resistance θJA = 170°C/W; derating 5.88mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pull to GND to disable regulator; output drops to 0V; reduces supply current to 6µA |
| 2 REF | 1.22V reference output | Supplies ≤100µA; bypass with ≤0.047µF capacitor to GND for stability |
| 3 SS | Soft-start timing and current limit clamp | Capacitor to GND sets startup ramp time; resistor to SHDN enables current boost during overload |
| 4 CC | Feedback compensation node | Connects to voltage divider output; 330pF capacitor to output ensures loop stability |
| 5 I.C. | Internal connection | No external connection permitted; internal test or bias node |
| 6 GND | Power and signal ground | Common return for all currents; requires low-inductance layout near V+ and LX pins |
| 7 LX | Switch node | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode |
| 8 V+ | Input supply voltage | 4V–11V input; bypass with 1µF ceramic + bulk electrolytic capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Configurable from 1.25V to VIN using external resistor divider; supports diverse rail requirements |
| Programmable soft-start | Capacitor on SS pin controls startup slew rate and limits inrush current without external circuitry |
| Integrated protection | Undervoltage lockout (3.75V/3.50V), cycle-by-cycle current limiting, and automatic soft-start recovery after fault |
| Fixed-frequency PWM | 160kHz operation enables predictable EMI spectrum and simplified filter design with standard inductors |
| Low-noise switching | No subharmonic ripple; clean output waveform reduces need for post-regulation filtering in noise-sensitive analog circuits |
Applications
| Portable Instrumentation | Computer Peripherals |
|---|---|
|
Use Scenario: Handheld multimeters, data loggers, and portable oscilloscopes powered by alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator converting battery voltage (e.g., 9V or 7.4V) to stable 3.3V or 5V for MCU and analog signal chain. Use Value: 450mA output and 6µA shutdown current extend battery runtime; SO-8 package enables compact PCB layout. |
Use Scenario: USB-powered external storage enclosures, docking stations, and interface adapters requiring local 3.3V/5V rails. IC Role / Device Role / Timing Role: Efficient local DC-DC conversion from 5V USB bus to lower logic rails while maintaining transient response. Use Value: 160kHz fixed frequency avoids USB 2.0 high-speed band interference; ±4.5% output accuracy ensures reliable peripheral operation. |
| Cellular Radios | Portable Communications Equipment |
|
Use Scenario: Battery-powered UHF/VHF transceivers and two-way radios with RF front-end and baseband processing sections. IC Role / Device Role / Timing Role: Dedicated power supply for RF synthesizer ICs and low-noise amplifiers demanding clean, ripple-free voltage. Use Value: Absence of subharmonic ripple prevents injection into sensitive RF paths; 85–90% efficiency reduces thermal load in sealed enclosures. |
Use Scenario: Ruggedized field communication terminals, satellite phone accessories, and tactical radios operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Industrial-grade power management IC supporting –40°C to +85°C operation with robust UVLO and overcurrent protection. Use Value: Guaranteed performance over full temperature range eliminates need for derating; SO-8 package withstands mechanical shock and vibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2671-5.0/NOPB | Fixed 5V output; 400mA max; 260kHz switching; no adjustable feedback or soft-start pin | Suitable only for fixed 5V systems; lacks flexibility for multi-rail designs or custom voltage scaling | Choose when 5V-only output and higher frequency are acceptable, and soft-start control is unnecessary |
| TPS5430DDAR | 3A output; 500kHz switching; external MOSFET driver; requires external compensation | Higher power and frequency, but demands more design effort and board area for external FET and gate drive | Prefer for >450mA loads or where dynamic response exceeds MAX750AESA+T capability |
Compared with LM2671-5.0/NOPB and TPS5430DDAR, the MAX750AESA+T offers optimal balance of integration (internal FET, REF, SS), industrial temperature support, and ease of use for sub-500mA portable applications-without requiring external MOSFETs or sacrificing adjustability.
Availability
MAX750AESA+T is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, and cellular radio applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX750AESA+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, communications, and consumer markets.
The MAX750AESA+T belongs to Maxim's legacy high-efficiency DC-DC regulator family, designed specifically for space-constrained, battery-powered systems needing reliable, integrated step-down conversion with minimal external components.
FAQ
What is the maximum input voltage rating for the MAX750AESA+T?
The MAX750AESA+T has an absolute maximum input voltage of +12V on the V+ pin, with recommended operating range from 4.0V to 11.0V. Exceeding 12V risks permanent damage. The device incorporates undervoltage lockout that disables operation below 3.50V and re-enables it above 3.75V, ensuring safe startup and brownout recovery.
Can the MAX750AESA+T be used to generate an output voltage lower than 1.25V?
No, the MAX750AESA+T cannot regulate below 1.25V. Its internal 1.22V reference sets the minimum feedback threshold; the lowest achievable output is approximately 1.25V (1.22V × (1 + R2/R3)). For sub-1.25V outputs, a different regulator with a lower reference or external reference injection would be required.
What inductor value is recommended for the MAX750AESA+T in industrial temperature applications?
For MAX750AESA+T (–40°C to +85°C grade), Maxim specifies a 33µH inductor (e.g., Sumida CD54-33ON or Coiltronics CTX50 series) with ≥1A saturation current and <0.8Ω DCR. This value is validated for full-load operation across the entire temperature range and eliminates need for custom inductor design.
Does the MAX750AESA+T require an external catch diode?
Yes, the MAX750AESA+T requires an external Schottky or high-speed silicon rectifier (e.g., 1N5817) connected between LX and output. The IC contains only the P-channel MOSFET switch; the diode provides the freewheeling path during the off-time and must handle ~1A peak current under full load.
How does the soft-start function behave during shutdown recovery?
When exiting shutdown (SHDN rising from GND to V+), the MAX750AESA+T initiates a full soft-start cycle: the SS pin voltage ramps up via its external capacitor, gradually increasing the current-limit threshold and preventing output overshoot or inrush current. This behavior is identical to power-up and fault recovery sequences.
MAX750AESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 11V
- Current - Output:
- 450mA
- Frequency - Switching:
- 170kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX750AESA+T FAQ
1.How can I place an order for MAX750AESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX750AESA+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 MAX750AESA+T reliable?
The price and inventory of MAX750AESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX750AESA+T is usually 5 days.
3.What payment methods are accepted for MAX750AESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX750AESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX750AESA+T?
MAX750AESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX750AESA+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 MAX750AESA+T?
For technical support, including MAX750AESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX750AESA+T requirements.
6.How does Aetrix verify that MAX750AESA+T is sourced from the original manufacturer or authorized distributors?
All MAX750AESA+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 MAX750AESA+T meets industry standards.
7.What is the process for return or replacement of MAX750AESA+T?
All MAX750AESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX750AESA+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 MAX750AESA+T part is unused and in its original packaging.
Return procedure for MAX750AESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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