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Analog Devices Inc./Maxim Integrated MAX750ACSA
- Part No.:
- MAX750ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX750ACSA.pdf
- Description:
- IC REG BUCK ADJ 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,220
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Product details
Overview
MAX750ACSA from Maxim Integrated is an adjustable-output, CMOS step-down DC-DC switching regulator in an 8-pin SO package. It operates from 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/temperature. It is used in portable instruments and computer peripherals requiring compact, efficient local regulation.
For engineers reviewing the MAX750ACSA datasheet, MAX750ACSA pinout, MAX750ACSA application, or MAX750ACSA equivalent, key selection criteria include input voltage range (4–11V), output current capability (450mA), shutdown quiescent current (6µA), soft-start programmability, and SO-8 thermal performance (471mW at +70°C).
Technical Context
The MAX750ACSA implements a current-mode PWM buck regulator with inner current-loop sensing and outer voltage-loop error amplification. Its fixed 160kHz oscillator enables predictable ripple filtering and eliminates subharmonic instability across its operating range.
It integrates a P-channel power MOSFET switch (LX pin), 1.22V bandgap reference (REF), soft-start timing control (SS), and protection circuitry including undervoltage lockout (3.5V fall / 3.75V rise), cycle-by-cycle current limiting, and shutdown logic. The IC requires only one external inductor (33µH or 100µH) and no custom magnetics design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 11.0V - supports single-cell Li-ion, 5V rail, or regulated 9V supplies without external pre-regulation. |
| Output Current | Up to 450mA - sufficient for microcontroller cores, analog front-ends, or FPGA I/O banks in portable systems. |
| Switching Frequency | 160kHz - enables use of small, low-cost 33µH or 100µH inductors and simplifies EMI filtering. |
| Efficiency | 85% to 92% - minimizes thermal load in space-constrained SO-8 packages; peak at mid-load (300mA @ 9V). |
| Quiescent Current | 1.7mA (active), 6µA (shutdown) - extends battery life in always-on or sleep-mode applications. |
| Output Voltage Accuracy | ±4.5% plus feedback resistor tolerance - ensures stable regulation across temperature and load without trimming. |
| Reference Voltage | 1.22V (typ), ±50ppm/°C drift - provides precise feedback point for adjustable outputs from 1.25V to V+. |
Pinout & Package
MAX750ACSA is housed in an 8-pin plastic small-outline (SO) package (JEDEC MS-012AA), 3.9mm × 4.9mm body, 1.75mm max height, with 1.27mm pitch. Thermal derating is 5.88mW/°C above +70°C (471mW max at TA = +70°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulling to GND disables regulator, drops output to 0V, and reduces supply current to 6µA; tie to V+ for normal operation. |
| 2 REF | 1.22V bandgap reference output | Supplies ≤100µA for external bias; 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 and maximum deliverable current; 0.1µF typical yields ~6ms soft-start. |
| 4 CC | Feedback compensation node | Connects to voltage divider from output; 330pF capacitor to output ensures loop stability across full input/output range. |
| 5 I.C. | Internal connection (no external connection) | Internally tied; must remain unconnected on PCB to avoid malfunction or damage. |
| 6 GND | Power and signal ground reference | Return path for internal circuits, LX switch, and external components; requires low-impedance layout to minimize noise. |
| 7 LX | Drain of internal P-channel MOSFET | Switches high-side; connects to inductor and catch diode anode; withstands (V+ − 12V) to (V+ + 0.3V) voltage swing. |
| 8 V+ | Main power supply input | Accepts 4–11V; bypass with 1µF ceramic + bulk electrolytic capacitor placed adjacent to pins 6 and 8. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.25V to V+ via external resistor divider - enables flexible rail generation (e.g., 3.3V, 2.5V, 1.8V) from same BOM part. |
| Programmable soft-start | Controlled by external SS capacitor - prevents inrush current, limits peak inductor current, and enables orderly power-up sequencing. |
| Integrated protection | Undervoltage lockout (3.5V/3.75V thresholds), cycle-by-cycle current limiting (~1.5A peak), and thermal-safe shutdown - eliminates need for discrete fault management. |
| Pre-qualified inductor support | Guaranteed operation with standard 33µH or 100µH off-the-shelf inductors - removes magnetics design risk and accelerates prototyping. |
| Low-noise switching | No subharmonic ripple in output spectrum - simplifies EMI compliance and avoids interference with sensitive analog or RF sections. |
Applications
| Portable Instruments | 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 for MCU, ADC, and display driver. Use Value: 450mA output supports active measurement cycles; 6µA shutdown extends shelf life; SO-8 footprint saves board area. |
Use Scenario: USB-powered docking stations, external HDD enclosures, and keyboard/mouse hubs with auxiliary 3.3V/5V rails. IC Role / Device Role / Timing Role: Local DC-DC converter deriving clean 3.3V from noisy 5V USB bus, independent of host port voltage sag. Use Value: 160kHz fixed frequency avoids USB 1.1/2.0 harmonics; ±4.5% accuracy ensures reliable USB enumeration and peripheral operation. |
| Cellular Phones & Radios | Portable Communications Equipment |
Use Scenario: Legacy GSM/GPRS handsets and two-way radios using 7.2V or 9V NiMH packs. IC Role / Device Role / Timing Role: Intermediate regulator supplying 2.8V to RF power amplifier bias and 1.8V to baseband processor core. Use Value: 85–92% efficiency preserves talk time; soft-start prevents PA turn-on glitches; SO-8 allows tight layout near RF section. |
Use Scenario: Tactical radios, satellite communicators, and field-deployable modems operating from 6–12V vehicle or battery sources. IC Role / Device Role / Timing Role: Main system regulator powering DSP, codec, and transceiver ICs under wide input variation and transient loads. Use Value: Current-mode control delivers fast load transient response (<50ms recovery); UVLO prevents brownout resets during engine cranking. |
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-ADJ | 500kHz switching, 1A output, wider 8–40V input, requires external N-MOSFET and diode | Better suited for higher-power industrial sensors or 24V bus conversion; not drop-in due to topology and pinout differences | Select when >450mA output or >11V input is required; expect redesign of inductor, diode, and compensation network |
| TPS54202D | 2.5–6V input, 2A output, integrated FETs, 500kHz, 2.5µA shutdown current | Optimized for low-voltage battery-powered IoT nodes; incompatible with 9V+ inputs used by MAX750ACSA | Choose for ultra-low-quiescent designs below 6V input; not suitable as direct replacement for 4–11V applications |
Compared with LM2675-ADJ and TPS54202D, the MAX750ACSA offers proven 4–11V compatibility, minimal external component count (single inductor, no external FET), and SO-8 thermal performance optimized for portable thermal envelopes - making it ideal where input range and simplicity outweigh raw current or quiescent specs.
Availability
MAX750ACSA is available at Aetrix Electronics and suitable for portable instruments, computer peripherals, and cellular radio designs requiring stable component supply, long-term manufacturability, and commercial-temperature-grade reliability.
Supply support for MAX750ACSA 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 cost-effective, easy-to-use current-mode buck regulator for battery-powered portable equipment - emphasizing low external component count, robust protection, and guaranteed performance with standard inductors.
FAQ
What is the maximum input voltage rating for MAX750ACSA?
The MAX750ACSA has an absolute maximum input voltage of +12V at the V+ pin, with recommended operating range of 4.0V to 11.0V. Exceeding 12V risks permanent damage. This distinguishes it from the MAX758A variant, which supports up to 16V input. Always observe the 12V limit when designing with MAX750ACSA.
Can MAX750ACSA be used to generate 3.3V from a 9V supply?
Yes, MAX750ACSA can reliably generate 3.3V from a 9V supply using an external resistor divider on the CC pin. With R3 = 13.0kΩ and R2 = 40.2kΩ (per typical application circuit), output is set to 5V; scaling R2 downward achieves 3.3V. Output accuracy remains within ±4.5% plus resistor tolerance across temperature and load.
Does MAX750ACSA require an external MOSFET or diode?
No, MAX750ACSA integrates a P-channel power MOSFET switch (on the LX pin) and requires only an external Schottky catch diode (e.g., 1N5817) and a single inductor. Unlike controllers, it is a complete regulator IC - eliminating external high-side switch design and reducing BOM count significantly.
What is the thermal performance of MAX750ACSA in SO-8 package?
MAX750ACSA in SO-8 package has a power dissipation limit of 471mW at +70°C ambient, with thermal derating of 5.88mW/°C above that temperature. At 450mA output and 9V input, typical power loss is ~350mW - well within safe SO-8 operating margins when using adequate copper pour and airflow.
How does the soft-start function work on MAX750ACSA?
The soft-start function on MAX750ACSA is controlled by an external capacitor on the SS pin. Charging this capacitor (e.g., 0.1µF) gradually raises the current-limit threshold, preventing inrush current and enabling controlled output voltage ramp-up. A 510kΩ resistor from SS to SHDN adds current boost for higher-current applications.
MAX750ACSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for MAX750ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX750ACSA 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 reliable?
The price and inventory of MAX750ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX750ACSA is usually 5 days.
3.What payment methods are accepted for MAX750ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX750ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX750ACSA?
MAX750ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX750ACSA 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?
For technical support, including MAX750ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX750ACSA requirements.
6.How does Aetrix verify that MAX750ACSA is sourced from the original manufacturer or authorized distributors?
All MAX750ACSA 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 meets industry standards.
7.What is the process for return or replacement of MAX750ACSA?
All MAX750ACSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX750ACSA, 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 part is unused and in its original packaging.
Return procedure for MAX750ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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