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Analog Devices Inc./Maxim Integrated MAX750AESA
- Part No.:
- MAX750AESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX750AESA.pdf
- Description:
- IC REG BUCK ADJ 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
MAX750AESA 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, achieves 85–92% efficiency, and features 1.7mA quiescent current and 6µA shutdown current. It is used in portable instrumentation requiring compact, efficient local power conversion.
For engineers reviewing the MAX750AESA datasheet, MAX750AESA pinout, MAX750AESA application, or MAX750AESA equivalent, key selection criteria include input voltage range (4–11V), output current capability (450mA), SO-8 package thermal performance (471mW at +70°C), and adjustable output voltage via external resistor divider.
Technical Context
The MAX750AESA implements a fixed-frequency (160kHz typical), current-mode PWM architecture with cycle-by-cycle current limiting and soft-start control. Its inner current loop monitors switch current through an internal sense path, while the outer voltage loop regulates output via feedback at the CC pin using a precision 1.22V reference.
It integrates an internal P-channel power MOSFET (LX pin), undervoltage lockout (UVLO activates at 3.75V rising, releases at 3.50V falling), and shutdown logic that forces output to 0V when SHDN is low. The device operates in continuous or discontinuous conduction mode depending on load, input voltage, and selected inductor (33µH or 100µH).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 11.0V - supports single-cell Li-ion or multi-cell alkaline/battery inputs without pre-regulation. |
| Output Current | Up to 450mA - sufficient for powering microcontrollers, sensors, and analog front-ends in portable systems. |
| Switching Frequency | 160kHz typical - enables use of small, low-cost external inductors (e.g., 33µH) and simplifies EMI filtering. |
| Reference Voltage | 1.22V ±4.5% over temp - sets output voltage accuracy when used with external resistor divider at CC pin. |
| Quiescent Current | 1.7mA typical - minimizes standby power loss in battery-operated devices during active operation. |
| Shutdown Current | 6µA typical - extends battery life during system sleep or off-states. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial and extended-temperature embedded applications. |
| Package Power Dissipation | 471mW at +70°C (SO-8) - defines maximum continuous power handling before thermal derating applies. |
Pinout & Package
MAX750AESA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch, body size 4.90mm × 3.90mm, and thermal pad not present. Pin 1 is marked by notch or dot; pin numbering is counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulling low disables regulator, drops output to 0V, and reduces supply current to 6µA; tie to V+ for normal operation. |
| 2 REF | Bandgap reference output | Provides stable 1.22V reference (±4.5%) for feedback network; max load 100µA; bypass with ≤0.047µF capacitor to GND. |
| 3 SS | Soft-start timing and current limit clamp | Capacitor from SS to GND sets startup ramp time and peak current limit; 510kΩ resistor to SHDN enables current boost during overload recovery. |
| 4 CC | Feedback compensation node | Connects to voltage divider from output; 330pF capacitor between CC and output ensures loop stability across line/load/temperature. |
| 5 I.C. | Internal connection | No external connection permitted; internally tied to substrate (V+); floating or driven externally may cause malfunction. |
| 6 GND | Power and signal ground reference | Common return for all internal circuits and external components; must be low-impedance and connected near V+ bypass capacitor. |
| 7 LX | Switch node (P-channel MOSFET drain) | Drives external inductor; swings from GND to V+ − 12V; requires low-inductance layout and Schottky catch diode (e.g., 1N5817). |
| 8 V+ | Positive supply input | Accepts 4–11V unregulated input; bypass with 1µF ceramic + bulk electrolytic capacitor placed adjacent to V+/GND pins. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.25V to VIN via external resistor divider at CC pin - enables flexible rail generation without custom IC variants. |
| Integrated P-channel MOSFET | On-resistance <0.5Ω - eliminates need for external high-side switch and simplifies board layout and BOM. |
| Current-mode PWM control | 160kHz fixed frequency with cycle-by-cycle current limiting - improves transient response and enables stable operation with wide input/output ratios. |
| Comprehensive protection | Undervoltage lockout (3.5V/3.75V thresholds), soft-start, and overcurrent limiting (~1.5A peak) - prevents damage during fault conditions and ensures controlled power-up. |
| Low-power shutdown mode | 6µA typical supply current - preserves battery charge in always-on or intermittently active portable systems. |
| Pre-qualified inductor support | Guaranteed operation with 33µH or 100µH inductors - removes inductor design effort and accelerates prototyping. |
Applications
| Portable Instrumentation | Computer Peripherals |
|---|---|
|
Use Scenario: Handheld multimeters, data loggers, and portable oscilloscopes powered by 2×AA or Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator converting 6–9V battery voltage to stable 3.3V or 5V for MCU, ADC, and display drivers. Use Value: Delivers 450mA at >90% efficiency across battery discharge curve, extending runtime while minimizing heat in sealed enclosures. |
Use Scenario: USB-powered external storage enclosures, docking stations, and printer interface modules. IC Role / Device Role / Timing Role: Local point-of-load regulator generating clean 3.3V from noisy 5V USB bus for logic and PHY circuitry. Use Value: 160kHz switching and integrated soft-start suppress inrush current and reduce conducted EMI into shared USB power rails. |
| Cellular Radios | Portable Communications Equipment |
|
Use Scenario: Battery-powered UHF/VHF transceivers and amateur radio handhelds operating from 7.2–10.8V NiMH packs. IC Role / Device Role / Timing Role: Supplies regulated 5V to RF front-end ICs and microcontroller subsystems with tight load-transient response. Use Value: Current-mode control ensures <50mV output deviation during 20–300mA load steps, preserving RF signal integrity and modulation fidelity. |
Use Scenario: Ruggedized field radios, satellite communicators, and tactical headsets requiring reliable operation from −40°C to +85°C. IC Role / Device Role / Timing Role: Main power converter for digital baseband and audio codec sections, leveraging −40°C to +85°C qualification. Use Value: Guaranteed 450mA output and UVLO behavior (3.5V release) prevent brownout resets during cold-weather battery voltage sag. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2675-5.0/NOPB | Fixed 5V output; 400mA rated; 260kHz switching; no adjustable feedback or soft-start pin. | Suitable only where 5V output is fixed and no sequencing control is needed. | Choose if simplicity and cost outweigh need for output adjustability and robust startup control. |
| TPS5430DDAR | 3A output capability; 500kHz switching; external compensation; wider 5.5–36V input range. | Over-specified for 450mA loads but offers higher efficiency at medium loads and better thermal margin. | Choose when future scalability, higher input voltage tolerance, or improved light-load efficiency is required. |
Compared with LM2675-5.0/NOPB and TPS5430DDAR, the MAX750AESA provides precise output adjustability, dedicated soft-start control, and optimized thermal performance in SO-8 for space-constrained 450mA applications - making it ideal where flexibility, reliability, and footprint matter more than raw current headroom or ultra-high frequency.
Availability
MAX750AESA is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, and cellular radios requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX750AESA 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, communications, and consumer applications.
The MAX750AESA belongs to Maxim's legacy high-efficiency DC-DC regulator family, engineered specifically for battery-powered portable equipment needing compact, low-quiescent-current step-down conversion with robust protection and simple external component requirements.
FAQ
What is the maximum guaranteed output current for MAX750AESA?
The MAX750AESA is guaranteed to deliver up to 450mA continuous output current across its full operating temperature range (−40°C to +85°C) and input voltage range (4V to 11V), as verified in the Electrical Characteristics table under "Load Regulation" and "Maximum Output Current vs. Supply Voltage" curves. This rating assumes proper thermal management and use of recommended external components such as a 33µH or 100µH inductor and low-ESR output capacitors.
Can MAX750AESA be used with a fixed 5V output configuration?
Yes, the MAX750AESA supports fixed 5V output by configuring the external resistor divider at the CC pin: set R3 = 13.0kΩ and R2 = 40.2kΩ to achieve VOUT = 5.00V ±4.5% (plus resistor tolerance). This configuration is validated in the Typical Operating Circuit (Figure 3) and confirmed in the Electrical Characteristics table, where output voltage is specified as 4.75V to 5.25V at nominal conditions.
What is the purpose of the I.C. pin on MAX750AESA?
The I.C. pin (Pin 5) on the MAX750AESA is an internal connection tied directly to the substrate and V+, with no external functionality. Maxim explicitly states "Make no external connection to this pin." Connecting it to any external net - including GND, V+, or signal traces - may disrupt internal biasing, cause latch-up, or degrade UVLO and current-limit performance. It must remain unconnected and isolated on the PCB.
How does the soft-start function work on MAX750AESA?
The MAX750AESA implements programmable soft-start via the SS pin: a capacitor (typically 0.1µF) from SS to GND controls ramp time, while a 510kΩ resistor from SS to SHDN enables current-boost during overload recovery. During startup or wake-from-shutdown, the SS capacitor charges linearly, gradually raising the current-limit threshold and preventing inrush current. Soft-start duration is documented in Table 1 and scales with C1 value and input voltage.
Is MAX750AESA pin-compatible with MAX758A variants?
No, MAX750AESA is not pin-compatible with MAX758A variants. Although both share identical 8-pin SO and DIP footprints and pin functions, the MAX758A has different absolute maximum ratings (e.g., V+ up to +18V vs. +12V for MAX750A), higher current capability (750mA), and distinct oscillator frequency (160kHz vs. 170kHz). Substituting them without verifying input voltage, load, and thermal limits risks overstress or regulation failure.
MAX750AESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for MAX750AESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX750AESA 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 reliable?
The price and inventory of MAX750AESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX750AESA is usually 5 days.
3.What payment methods are accepted for MAX750AESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX750AESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX750AESA?
MAX750AESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX750AESA 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?
For technical support, including MAX750AESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX750AESA requirements.
6.How does Aetrix verify that MAX750AESA is sourced from the original manufacturer or authorized distributors?
All MAX750AESA 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 meets industry standards.
7.What is the process for return or replacement of MAX750AESA?
All MAX750AESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX750AESA, 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 part is unused and in its original packaging.
Return procedure for MAX750AESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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