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Analog Devices Inc./Maxim Integrated MAX758ACPA
- Part No.:
- MAX758ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX758ACPA.pdf
- Description:
- IC REG BUCK ADJ 750MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,548
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Product details
Overview
MAX758ACPA from Maxim Integrated is an adjustable-output, current-mode PWM step-down DC-DC switching regulator in an 8-pin plastic DIP package. It accepts 4V to 16V input, delivers up to 750mA output current, operates at 160kHz fixed frequency, achieves 85–90% efficiency, and features ±4.5% output voltage accuracy over line/load/temperature - ideal for battery-powered portable instrumentation requiring stable 5V rail generation.
For engineers reviewing the MAX758ACPA datasheet, MAX758ACPA pinout, MAX758ACPA application, or MAX758ACPA equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (including V+ range, LX switching behavior, REF voltage, and SHDN logic), and real-world design implications for portable power systems.
Technical Context
The MAX758ACPA implements a current-mode PWM control architecture with inner-loop current sensing and outer-loop voltage regulation. Its 160kHz oscillator drives a P-channel internal power MOSFET (LX pin), enabling cycle-by-cycle current limiting and fast transient response without external compensation complexity.
It integrates undervoltage lockout (UVLO) with 3.75V turn-on and 3.50V turn-off thresholds, soft-start via external capacitor on SS pin, and shutdown mode reducing supply current to 6µA. The 1.22V bandgap reference (REF pin) supplies up to 100µA and supports adjustable output from 1.25V to V+ using a two-resistor feedback divider at CC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 16.0V - supports wide-input unregulated sources like 12V batteries or wall adapters. |
| Output Current | Up to 750mA - sufficient for powering microcontrollers, sensors, and analog circuitry in portable instruments. |
| Switching Frequency | 160kHz - enables use of compact 33µH or 100µH inductors and simplifies EMI filtering. |
| Reference Voltage | 1.22V ±3% - sets output voltage accuracy baseline; tolerance contributes directly to overall ±4.5% output error. |
| Quiescent Current | 1.7mA typical - minimizes no-load power loss in always-on subsystems. |
| Shutdown Current | 6µA typical - preserves battery life during system sleep modes. |
| UVLO Threshold | 3.75V (rising), 3.50V (falling) - prevents erratic operation during brownout or battery depletion. |
Pinout & Package
MAX758ACPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.300" body width and 0.100" lead pitch, rated for 0°C to +70°C operation. Pin 1 is bottom-left when notch faces up; pin numbering follows standard DIP convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Grounding disables regulator, dropping output to 0V and reducing supply current to 6µA. |
| 2 REF | 1.22V bandgap reference output | Provides precision reference for feedback network; bypass with ≤0.047µF capacitor to GND. |
| 3 SS | Soft-start timing and current limit clamp | Capacitor to GND controls startup ramp time and maximum deliverable current before regulation. |
| 4 CC | Feedback input / error amplifier inverting input | Connects to resistor divider from VOUT; sets output voltage via VOUT = 1.22V × (1 + R2/R3). |
| 5 I.C. | Internal connection | No external connection permitted; internally tied to substrate (V+). |
| 6 GND | Power and signal ground reference | Must be low-impedance return path for LX switching current and feedback loop stability. |
| 7 LX | Drain of internal P-channel MOSFET | Switches between V+ and GND; connects to inductor and catch diode anode in buck topology. |
| 8 V+ | Positive supply input | Accepts 4V–16V; requires local 1µF ceramic + bulk electrolytic bypassing near pins 6 and 8. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.25V to V+ via external resistor divider - supports custom rails without redesigning regulator IC. |
| Fixed-frequency current-mode PWM | 160kHz operation with inherent cycle-by-cycle current limiting - eliminates subharmonic oscillation and eases filter design. |
| Integrated protection | Undervoltage lockout, soft-start, and overcurrent limiting - prevents inrush damage and ensures orderly power-up. |
| Low quiescent and shutdown current | 1.7mA active, 6µA shutdown - extends battery runtime in portable equipment with intermittent operation. |
| Pre-qualified inductor compatibility | Guaranteed performance with 33µH or 100µH off-the-shelf inductors - eliminates custom magnetics design effort. |
Applications
| Portable Instrument Power Supply | Cellular Radio Baseband Supply |
|---|---|
|
Use Scenario: Powering analog front-end, ADC, and microcontroller in handheld multimeters or data loggers powered by 9V alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 5V rail from variable battery input (6V–16V). Use Value: Delivers 750mA at >85% efficiency across full battery discharge curve, minimizing heat and extending runtime. |
Use Scenario: Providing clean 5V supply to baseband processor and RF interface circuits in 2G/3G cellular handsets. IC Role / Device Role / Timing Role: High-efficiency buck converter with fast load-transient response to handle burst-mode transmission current spikes. Use Value: 160kHz fixed frequency avoids interference with cellular bands; 750mA capability supports peak transmit loads without dropout. |
| Computer Peripheral Power | Portable Communications Equipment |
|
Use Scenario: Generating 5V for USB-connected peripherals such as barcode scanners or POS terminals with wide-input AC-DC adapters. IC Role / Device Role / Timing Role: Input-flexible DC-DC regulator accepting 4V–16V unregulated adapter output. Use Value: UVLO prevents malfunction during adapter plug/unplug; shutdown mode enables host-controlled power gating. |
Use Scenario: Supplying regulated 5V to transceiver modules and DSPs in portable radios or satellite communicators. IC Role / Device Role / Timing Role: Robust buck regulator with thermal-stable reference and soft-start for cold-start reliability. Use Value: ±4.5% output accuracy over temperature ensures consistent analog performance; 8-pin DIP simplifies prototyping and repair. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2574N-5.0 | Fixed 5V output, 52kHz switching, 500mA max, no adjustable feedback or soft-start pin. | Suitable only for fixed-rail designs; lacks flexibility for custom voltages or controlled startup. | Choose when 5V output suffices and cost sensitivity outweighs feature requirements. |
| TPS5430DR | 3.0A output, 500kHz switching, SO-8 package, requires external compensation, higher quiescent current (3.5mA). | Better for high-current, space-constrained PCBs but increases layout complexity and BOM count. | Choose when >750mA load or smaller footprint is critical, and design resources support compensation tuning. |
Compared with LM2574N-5.0 and TPS5430DR, the MAX758ACPA offers unique value in adjustable output, integrated soft-start/UVLO, and proven 750mA delivery in through-hole DIP - balancing flexibility, reliability, and ease-of-use for portable industrial designs.
Availability
MAX758ACPA is available at Aetrix Electronics and suitable for portable instrumentation, cellular radio subsystems, and computer peripheral power supplies requiring stable component supply across commercial temperature range (0°C to +70°C) and long-term design continuity.
Supply support for MAX758ACPA 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/MAX758A product line was designed specifically for compact, efficient, and easy-to-implement step-down power conversion in battery-operated portable equipment - emphasizing simplicity, reliability, and minimal external component count.
FAQ
What is the maximum input voltage rating for MAX758ACPA?
The MAX758ACPA has an absolute maximum input voltage (V+) of +18V, with guaranteed operation from 4.0V to 16.0V. Exceeding 16.0V may cause functional degradation or permanent damage, and operation above 18V violates absolute maximum ratings per the datasheet.
Does MAX758ACPA require external compensation components?
Yes - the MAX758ACPA requires a 330pF capacitor between CC and VOUT for stable loop compensation. This value is specified in the Typical Operating Circuit and Applications Information sections and is necessary to maintain phase margin across line, load, and temperature variations.
Can MAX758ACPA generate output voltages below 1.25V?
No - the MAX758ACPA's output voltage is limited to a minimum of 1.25V, set by the internal 1.22V reference and feedback architecture. Attempting lower outputs violates the reference headroom requirement and results in regulation failure.
What is the purpose of the I.C. pin on MAX758ACPA?
The I.C. pin (Pin 5) is an internal connection tied to the substrate and V+. It must remain unconnected externally - any external wiring risks latch-up, instability, or device damage due to unintended current paths or parasitic coupling.
How does the soft-start function behave during undervoltage lockout recovery?
When V+ rises above 3.75V after falling below 3.50V, the MAX758ACPA initiates a full soft-start cycle: the SS pin capacitor recharges, gradually increasing the current-limit threshold and ramping output voltage to prevent inrush current - identical to power-up behavior.
MAX758ACPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 16V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 16V
- Current - Output:
- 750mA
- Frequency - Switching:
- 160kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX758ACPA FAQ
1.How can I place an order for MAX758ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX758ACPA 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 MAX758ACPA reliable?
The price and inventory of MAX758ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX758ACPA is usually 5 days.
3.What payment methods are accepted for MAX758ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX758ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX758ACPA?
MAX758ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX758ACPA 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 MAX758ACPA?
For technical support, including MAX758ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX758ACPA requirements.
6.How does Aetrix verify that MAX758ACPA is sourced from the original manufacturer or authorized distributors?
All MAX758ACPA 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 MAX758ACPA meets industry standards.
7.What is the process for return or replacement of MAX758ACPA?
All MAX758ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX758ACPA, 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 MAX758ACPA part is unused and in its original packaging.
Return procedure for MAX758ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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