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Analog Devices Inc./Maxim Integrated MAX750ACSA+T
- Part No.:
- MAX750ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX750ACSA+T.pdf
- Description:
- IC REG BUCK ADJ 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,484
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Product details
Overview
MAX750ACSA+T from Maxim Integrated is a CMOS step-down DC-DC switching regulator in 8-pin SO package, delivering up to 450mA output current with adjustable output voltage (1.25V to VIN), 160kHz fixed-frequency PWM control, and ±4.5% output voltage accuracy over line/load/temperature. It operates from 4V to 11V input and achieves 85–92% efficiency in portable instrumentation power rails.
For engineers reviewing the MAX750ACSA+T datasheet, MAX750ACSA+T pinout, MAX750ACSA+T application, or MAX750ACSA+T equivalent, key selection considerations include its current-mode PWM architecture for fast transient response, soft-start and undervoltage lockout protection, shutdown current of 6µA, and compatibility with pre-selected 33µH or 100µH inductors without custom design.
Technical Context
The MAX750ACSA+T implements a current-mode pulse-width-modulation control scheme with inner current-loop sensing and outer voltage-loop regulation, enabling cycle-by-cycle current limiting and improved load transient response. Its internal 1.22V bandgap reference feeds the error amplifier via the REF pin and supports external feedback through the CC pin.
It features programmable soft-start via an external capacitor on SS, undervoltage lockout activating at 3.75V (rising) and deactivating at 3.50V (falling), and shutdown control via active-low SHDN pin that forces output to 0V and reduces supply current to 6µA typical. The LX pin drives an internal P-channel MOSFET switch with 0.5Ω on-resistance.
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, off-the-shelf inductors (33µH or 100µH) and simplifies EMI filtering. |
| Output Voltage Accuracy | ±4.5% plus resistor tolerance - ensures stable regulation across temperature and load without trimming. |
| Quiescent Current | 1.7mA typical - minimizes no-load power loss in always-on subsystems. |
| Shutdown Current | 6µA typical - critical for ultra-low-power sleep modes in battery-operated devices. |
| Reference Voltage | 1.22V ±0.07V - sets feedback threshold for precise output adjustment using external resistor divider. |
Pinout & Package
MAX750ACSA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with dimensions 4.90mm × 3.90mm × 1.75mm and 1.27mm lead pitch. Pin 1 is marked by a beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulling low disables internal FET, drops output to 0V, and reduces supply current to 6µA. |
| 2 REF | 1.22V reference output | Provides stable 1.22V bias for feedback network; max 100µA load; bypass with ≤0.047µF capacitor. |
| 3 SS | Soft-start timing and current limit clamp | Capacitor to GND sets startup ramp time and peak current limit; 510kΩ resistor to SHDN enables >1A current boost. |
| 4 CC | Feedback compensation node | Connects to external voltage divider; 330pF capacitor to output ensures loop stability and wide input range. |
| 5 I.C. | Internal connection | No external connection permitted; internally tied to substrate or bias network. |
| 6 GND | Analog/digital ground reference | Common return for all internal circuits; must connect to low-impedance PCB ground plane. |
| 7 LX | Switch node | Drain of internal P-channel MOSFET; connects to inductor and catch diode; handles up to 2A peak current. |
| 8 V+ | Power supply input | Accepts 4V–11V; requires local 1µF ceramic + bulk electrolytic bypassing close to pins 6 and 8. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables precise cycle-by-cycle current limiting and superior load transient response vs. voltage-mode regulators. |
| Adjustable output (1.25V to VIN) | Supports flexible rail generation (e.g., 3.3V, 2.5V, 1.8V) using only two external resistors - no dedicated fixed-output variants needed. |
| Integrated soft-start and UVLO | Prevents inrush current and unstable startup; UVLO ensures operation only within safe input range (3.5V–11V). |
| Pre-qualified inductor support | Guaranteed performance with standard 33µH or 100µH inductors - eliminates custom magnetics design and qualification effort. |
| Low shutdown current (6µA) | Extends battery life in standby mode; enables rapid wake-up without full re-initialization. |
Applications
| Portable Instrumentation Power | Computer Peripheral Regulation |
|---|---|
|
Use Scenario: Powering handheld multimeters, data loggers, and sensor nodes powered by 3×AA or Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V or 5V rail for MCU, ADC, and display drivers. Use Value: 450mA output and 85–92% efficiency extend battery runtime; 160kHz switching allows compact 33µH inductor and minimal board area. |
Use Scenario: Supplying regulated 5V or 3.3V to USB hubs, card readers, and external storage enclosures. IC Role / Device Role / Timing Role: Efficient local DC-DC conversion from unregulated 5V or 12V bus to logic-level rails. Use Value: Adjustable output accommodates varying peripheral voltage requirements; soft-start prevents bus droop during hot-plug events. |
| Cellular Radio Subsystem | Portable Communications Equipment |
|
Use Scenario: Providing clean, low-noise 2.8V or 3.0V supply to RF transceivers and baseband processors in 2G/3G modules. IC Role / Device Role / Timing Role: Dedicated point-of-load regulator with low ripple and fast transient recovery for sensitive RF circuitry. Use Value: Absence of subharmonic ripple and fixed 160kHz frequency simplify EMI filtering; ±4.5% accuracy ensures reliable RF IC operation. |
Use Scenario: Power management in walkie-talkies, satellite phones, and ruggedized field radios operating from primary batteries. IC Role / Device Role / Timing Role: Main system regulator handling wide input variation (4V–11V) as battery discharges. Use Value: Undervoltage lockout (3.5V cutoff) protects against brownout-induced firmware corruption; 6µA shutdown preserves charge during idle periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX758ACSA+T | Wider 4V–16V input range, 750mA output, 160kHz oscillator (same family, higher-current variant). | Suitable for 12V-input systems (e.g., automotive accessories, industrial 12V rails); not drop-in due to higher peak current and different thermal limits. | Select MAX758ACSA+T when input exceeds 11V or load exceeds 450mA; verify PCB layout for increased power dissipation. |
| TPS54202DRCT | 4.5V–17V input, 2A output, 500kHz–2.2MHz adjustable frequency, integrated high-side FET, 2.5µA shutdown current. | Higher integration (no external diode), faster switching, lower quiescent current - but requires full compensation design and lacks factory-validated inductor options. | Choose TPS54202DRCT for space-constrained designs needing >450mA or ultra-low IQ; avoid if leveraging MAX750's plug-and-play inductor simplicity. |
Compared with MAX758ACSA+T, the MAX750ACSA+T offers tighter input range and lower current for cost-sensitive 5V/3.3V portable rails; compared with TPS54202DRCT, it trades integration for guaranteed performance with minimal external components and no loop compensation tuning.
Availability
MAX750ACSA+T is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, and cellular radio subsystems requiring stable component supply with commercial-temperature grade reliability and long-term sourcing continuity.
Supply support for MAX750ACSA+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 demanding industrial, communications, and consumer applications.
The MAX750A series belongs to Maxim's legacy high-efficiency DC-DC regulator product line, designed specifically for battery-powered portable equipment where simplicity, reliability, and predictable performance with minimal external components are critical.
FAQ
What is the maximum input voltage rating for MAX750ACSA+T?
The MAX750ACSA+T has an absolute maximum input voltage of +12V on the V+ pin, with recommended operating range from 4.0V to 11.0V. Exceeding 11.0V may trigger undervoltage lockout deactivation or cause excessive power dissipation; the MAX758A variant supports up to 16V and should be used for higher-input applications. Always observe derating curves in the datasheet for thermal safety.
Can MAX750ACSA+T generate a 3.3V output, and what resistor values are required?
Yes, MAX750ACSA+T supports adjustable output from 1.25V to VIN. For 3.3V output, use R3 = 10kΩ and calculate R2 = R3 × ((3.3V / 1.22V) − 1) ≈ 17.1kΩ (e.g., 17.4kΩ 1% resistor). The REF pin provides the 1.22V reference, and output accuracy remains ±4.5% over temperature plus resistor tolerance - confirmed in the Electrical Characteristics table for MAX750A.
Does MAX750ACSA+T require an external catch diode, and what type is recommended?
Yes, MAX750ACSA+T requires an external Schottky or high-speed silicon catch diode connected between LX and GND. The 1N5817 is explicitly recommended in the datasheet for full-load (450mA) operation due to its 1A peak current rating and low forward voltage. Using a non-Schottky diode increases conduction loss and reduces efficiency; omitting the diode will cause catastrophic failure.
How does the soft-start function work on MAX750ACSA+T, and how is it configured?
The MAX750ACSA+T implements soft-start via an external capacitor (C1) from SS to GND, which controls both startup ramp time and peak current limit. A typical value is 0.1µF, yielding ~6ms soft-start with 510kΩ resistor from SS to SHDN. This configuration prevents inrush current, enables orderly power-up, and provides short-circuit protection - all verified in Figure 2 and Table 1 of the MAX750A/MAX758A datasheet.
Is MAX750ACSA+T pin-compatible with MAX758ACSA+T, and can they be interchanged on the same PCB?
No, MAX750ACSA+T and MAX758ACSA+T are not pin-compatible replacements. Although both use 8-pin SO packages and share identical pin numbering and functions, their electrical specifications differ significantly: MAX758A supports 4V–16V input and 750mA output versus MAX750A's 4V–11V and 450mA. Interchanging them risks overcurrent, thermal overload, or UVLO malfunction - validated by separate Absolute Maximum Ratings and Electrical Characteristics tables.
MAX750ACSA+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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX750ACSA+T FAQ
1.How can I place an order for MAX750ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX750ACSA+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 MAX750ACSA+T reliable?
The price and inventory of MAX750ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX750ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX750ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX750ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX750ACSA+T?
MAX750ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX750ACSA+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 MAX750ACSA+T?
For technical support, including MAX750ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX750ACSA+T requirements.
6.How does Aetrix verify that MAX750ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX750ACSA+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 MAX750ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX750ACSA+T?
All MAX750ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX750ACSA+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 MAX750ACSA+T part is unused and in its original packaging.
Return procedure for MAX750ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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