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Analog Devices Inc./Maxim Integrated MAX750ACPA
- Part No.:
- MAX750ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX750ACPA.pdf
- Description:
- IC REG PWM STEP-DWN ADJ 8-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
The MAX750ACPA from Maxim Integrated is an adjustable-output, CMOS step-down DC-DC switching regulator in an 8-pin plastic DIP package. It operates from a 4V to 11V input, delivers up to 450mA output current, features 160kHz current-mode PWM control, achieves 85–92% efficiency, and maintains ±4.5% output voltage accuracy over line, load, and temperature - ideal for space-constrained portable instrumentation requiring stable low-noise 5V rail generation.
For engineers reviewing the MAX750ACPA datasheet, MAX750ACPA pinout, MAX750ACPA application, or MAX750ACPA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (input range, output adjustability, shutdown current ≤6µA), and real-world application constraints including soft-start timing, inductor selection (33µH or 100µH), and thermal derating (727mW at +70°C).
Technical Context
The MAX750ACPA implements a fixed-frequency (160kHz) current-mode PWM architecture with inner-loop switch-current sensing and outer-loop voltage error amplification. It integrates a P-channel power MOSFET (LX pin), 1.22V bandgap reference (REF), soft-start clamp (SS), and undervoltage lockout (UVLO) that activates at 3.75V (rising) and releases at 3.50V (falling).
It supports adjustable output voltages from 1.25V to VIN via external resistor divider on CC pin, uses cycle-by-cycle current limiting (trip ≈1.5A), and requires no inductor design - guaranteed performance with pre-qualified 33µH (wide-temp) or 100µH (commercial) inductors. Shutdown mode reduces supply current to 6µA typical while discharging SS capacitor and disabling REF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 11.0V - defines minimum battery voltage support and maximum unregulated supply tolerance before UVLO or overstress. |
| Output Current | Up to 450mA - maximum continuous load at 5V output with VIN ≥6V; derates with lower input or higher ambient temperature. |
| Switching Frequency | 160kHz - enables use of small, low-cost external inductors (33µH/100µH) and simplifies EMI filtering vs. variable-frequency alternatives. |
| Reference Voltage | 1.22V ±4.5% - sets output adjustment resolution and accuracy baseline; tolerances of external R2/R3 directly add to total output error. |
| Quiescent Current | 1.7mA typical - determines no-load power loss in active operation; critical for battery runtime in always-on subsystems. |
| Shutdown Current | 6µA typical - enables ultra-low standby power; settles to <25µA over temperature but guaranteed ≤100µA per spec. |
| Efficiency | 85% to 92% - measured at 5V/300mA with VIN = 9V; peaks near mid-load and drops at light/heavy loads due to fixed overhead losses. |
Pinout & Package
Package: 8-pin plastic DIP (0.300" wide), 7.62mm × 6.10mm footprint, 3.18mm height, 9.09mW/°C thermal derating above +70°C, 727mW max power dissipation at TA = +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pull to GND to disable regulator; output falls to 0V, REF disabled, SS capacitor discharged - enables system-level power sequencing. |
| 2 REF | 1.22V bandgap reference output | Supplies ≤100µA; bypass with ≤0.047µF capacitor to GND for noise immunity - used as precision feedback reference for output adjustment. |
| 3 SS | Soft-start timing and current limit clamp | Capacitor to GND sets startup ramp time; 510kΩ resistor to SHDN boosts current limit during start-up - prevents inrush and enables fault recovery. |
| 4 CC | Feedback compensation node | Connects to voltage divider (R2/R3) from output; 330pF capacitor to output stabilizes loop - determines output voltage setpoint and transient response. |
| 5 I.C. | Internal connection | No external connection permitted - internal bond wire to substrate; floating or driven externally may cause malfunction or damage. |
| 6 GND | Power and signal ground reference | Return path for LX switch current, REF load, and error amplifier - must be low-impedance star point to minimize noise coupling into feedback path. |
| 7 LX | Drain of internal P-channel MOSFET | Switches between VIN and GND; drives external inductor; rated for 2A peak current - requires low-inductance layout and Schottky catch diode (e.g., 1N5817). |
| 8 V+ | Main power supply input | 4V–11V input; bypass with 1µF ceramic + bulk electrolytic capacitor - placement within 2mm of V+/GND pins is mandatory for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage (1.25V to VIN) | Enables single BOM across multiple rail requirements (e.g., 3.3V, 5V) using only two external resistors - eliminates need for multiple fixed-output variants. |
| 160kHz fixed-frequency PWM | Provides predictable EMI spectrum and simplified filter design; avoids subharmonic ripple - allows use of smaller LC filters than variable-frequency alternatives. |
| Cycle-by-cycle current limiting | Guarantees safe operation under short-circuit or overload; limits peak inductor current to ~1.5A - protects internal MOSFET and external components without external sense resistor. |
| Integrated soft-start with programmable timing | Prevents output overshoot and inrush current via external CSS; typical 4–27ms ramp with 0.1µF capacitor - ensures clean power-up in multi-rail systems. |
| Undervoltage lockout (UVLO) | Disables regulator when VIN drops below 3.5V (falling) and re-enables at 3.75V (rising) - prevents brownout operation and erratic behavior during battery discharge. |
Applications
| Portable Instruments | Computer Peripherals |
|---|---|
Use Scenario: Handheld multimeter powered by two AA alkaline cells (2.4V–3.2V nominal, up to 3.6V fresh) requiring regulated 5V for ADC and microcontroller. IC Role / Device Role / Timing Role: Step-down regulator generating stable 5V rail from declining battery voltage; UVLO prevents operation below 3.5V to avoid measurement drift. Use Value: Delivers 450mA at >85% efficiency down to 4V input, enabling >10-hour runtime; soft-start eliminates display flicker during power-on. |
Use Scenario: USB-powered external hard drive enclosure needing 5V for SATA bridge IC and 3.3V for flash controller, derived from 5V bus. IC Role / Device Role / Timing Role: Secondary buck regulator generating clean 3.3V from noisy USB 5V; adjustable output allows precise 3.3V ±1% setting. Use Value: 1.7mA quiescent current minimizes parasitic drain on USB port; 160kHz switching avoids interference with USB 2.0 high-speed data lines. |
| Cellular Phones & Radios | Portable Communications Equipment |
Use Scenario: Legacy GSM phone baseband module requiring 2.8V core supply from 3.6V Li-ion battery with tight ripple budget (<20mVpp). IC Role / Device Role / Timing Role: Primary DC-DC converter stepping down battery voltage; CC pin configured with precision resistor divider for 2.8V output. Use Value: Subharmonic-free ripple enables direct use without additional LC filtering; 6µA shutdown current extends standby time to >1 week. |
Use Scenario: Portable two-way radio transceiver needing 5V for RF front-end and 3.3V for digital baseband, both sourced from 7.4V Li-Po pack. IC Role / Device Role / Timing Role: Dual-rail power solution using two MAX750ACPA units - one for 5V, one for 3.3V - sharing common input and thermal management. Use Value: Identical 8-pin DIP footprint simplifies PCB layout reuse; guaranteed 450mA output supports burst transmit current without dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX750ACSA | Same electrical specs, but in 8-pin SO package (3.9mm × 4.9mm); 5.88mW/°C thermal derating vs. 9.09mW/°C for DIP. | Better suited for automated SMT assembly and higher-density boards; lower thermal mass requires careful heatsinking at full load. | Select MAX750ACSA for volume production with reflow capability; retain MAX750ACPA for through-hole prototyping or legacy DIP-based designs. |
| LM2574N-5.0 | Fixed 5V output (non-adjustable); 52kHz switching frequency; 500mA output; requires external diode and larger inductor (100–330µH). | Limited to single-rail 5V systems; lower frequency increases size/cost of magnetics; no soft-start or UVLO hysteresis. | Choose LM2574N-5.0 only if fixed 5V output suffices and board area permits larger inductor; MAX750ACPA preferred for adjustable rails or tighter EMI control. |
Compared with MAX750ACSA, the MAX750ACPA offers superior thermal performance in through-hole layouts and easier hand-soldering, while LM2574N-5.0 trades adjustability and feature set for lower BOM count in simple fixed-output cases - making MAX750ACPA optimal for multi-voltage, battery-powered, or noise-sensitive applications.
Availability
MAX750ACPA is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, and cellular radio applications requiring stable component supply, long-lifecycle support, and traceable sourcing for industrial and medical OEM programs.
Supply support for MAX750ACPA 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 applications.
The MAX750A series was designed as a compact, efficient, and easy-to-use step-down regulator for battery-powered portable equipment - emphasizing low quiescent current, integrated protection, and minimal external component count.
FAQ
What is the absolute maximum input voltage rating for the MAX750ACPA?
The MAX750ACPA has an absolute maximum V+ rating of +12V (with –0.3V negative margin). Operation beyond 11.0V violates the recommended input range and risks triggering undervoltage lockout release instability or exceeding internal MOSFET breakdown limits. Always maintain V+ ≤11.0V for reliable long-term function.
Can the MAX750ACPA generate an output voltage lower than 1.25V?
No - the MAX750ACPA's internal 1.22V reference and feedback architecture limit the minimum adjustable output to 1.25V. Attempting lower outputs by modifying the resistor divider violates the specified operating conditions and results in poor regulation, increased error, and potential instability due to insufficient headroom for the error amplifier.
What inductor value is required for the MAX750ACPA in commercial-temperature applications?
For MAX750ACPA (commercial grade), a 100µH inductor is pre-qualified and guaranteed to deliver full 450mA output with >85% efficiency. The inductor must have ≥1A saturation current rating and <0.8Ω DC resistance. Sumida CD54-101KC or Renco RL1284-100 are validated options per Maxim's reference design.
How does the MAX750ACPA behave during startup with no soft-start capacitor?
Without an external capacitor on the SS pin, the MAX750ACPA initiates immediate full-current startup, causing large inrush current and potential output overshoot. The soft-start capacitor (typically 0.1µF) is mandatory for controlled ramp-up; omission risks damaging downstream circuitry or violating input supply surge limits.
Is the MAX750ACPA pin-compatible with the MAX758ACPA?
Yes - both MAX750ACPA and MAX758ACPA share identical 8-pin DIP pinout, pin functions, and package dimensions. However, MAX758ACPA supports 4V–16V input and 750mA output, while MAX750ACPA is limited to 4V–11V and 450mA; substituting MAX758ACPA into a MAX750ACPA design is electrically safe but may require layout review for thermal handling at higher load currents.
MAX750ACPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX750ACPA FAQ
1.How can I place an order for MAX750ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX750ACPA 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 MAX750ACPA reliable?
The price and inventory of MAX750ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX750ACPA is usually 5 days.
3.What payment methods are accepted for MAX750ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX750ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX750ACPA?
MAX750ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX750ACPA 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 MAX750ACPA?
For technical support, including MAX750ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX750ACPA requirements.
6.How does Aetrix verify that MAX750ACPA is sourced from the original manufacturer or authorized distributors?
All MAX750ACPA 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 MAX750ACPA meets industry standards.
7.What is the process for return or replacement of MAX750ACPA?
All MAX750ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX750ACPA, 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 MAX750ACPA part is unused and in its original packaging.
Return procedure for MAX750ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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