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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:1,559
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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% typical efficiency, and features 6µA shutdown supply current. It is used in portable instrumentation requiring stable, compact, high-efficiency power conversion from unregulated battery or wall-adapter sources.
For engineers reviewing the MAX758ACPA+ datasheet, MAX758ACPA+ pinout, MAX758ACPA+ application, or MAX758ACPA+ equivalent, this page provides verified technical context, confirmed pin functions, real-world operating constraints (e.g., 3.5V undervoltage lockout, ±4.5% output voltage accuracy), and validated alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX758ACPA+ implements a current-mode PWM control architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting (trip point ~1.5A), and an outer voltage loop regulating output via a 1.22V internal bandgap reference. Its fixed 160kHz oscillator ensures predictable EMI filtering and eliminates subharmonic ripple across the full load/temperature range.
It integrates protection features including soft-start (capacitor-programmable), undervoltage lockout (3.5V falling / 3.75V rising thresholds), and overcurrent fault recovery via automatic soft-start reinitiation. The LX pin drives an internal P-channel MOSFET switch, while REF supplies up to 100µA for external biasing - all within a single 8-pin DIP footprint requiring only one pre-selected inductor (33µH or 100µH) and no custom magnetics design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 16.0V - supports wide-range unregulated inputs such as 12V lead-acid or multi-cell Li-ion batteries without external pre-regulation. |
| Output Current | Up to 750mA - sufficient for powering microcontrollers, sensors, and analog front-ends in portable systems. |
| Switching Frequency | 160kHz - enables use of small, low-cost external components (e.g., 33µH or 100µH inductors) and simplifies EMI filter design. |
| Efficiency | 85% to 90% typical - minimizes thermal rise and extends battery runtime in space-constrained applications. |
| Shutdown Supply Current | 6µA typical - ensures ultra-low quiescent drain during system sleep modes, critical for always-on sensor nodes. |
| Output Voltage Accuracy | ±4.5% plus external resistor tolerance - defines worst-case regulation error over line, load, and temperature (0°C to +70°C). |
| Undervoltage Lockout | 3.5V (falling), 3.75V (rising) - prevents erratic operation during brownout conditions and ensures clean startup. |
Pinout & Package
MAX758ACPA+ uses an 8-pin plastic DIP (dual-in-line package) with 0.300" body width and 0.100" lead pitch. Pin 1 is located at the left end of the top row when viewing the top side with the notch or dot oriented left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Grounding disables the regulator, dropping output to 0V and reducing supply current to 6µA; tie to V+ for normal operation. |
| 2 REF | 1.22V bandgap reference output | Provides stable 1.22V reference (±1.5% over temp) with ≤100µA drive capability; bypass with ≤0.047µF capacitor to GND. |
| 3 SS | Soft-start timing and current limit clamp | Capacitor from SS to GND sets soft-start time and maximum regulated output current; 510kΩ resistor to SHDN enables current boost. |
| 4 CC | Feedback compensation node | Connects to external voltage divider; 330pF capacitor between CC and output ensures stability across full input/output range. |
| 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 path for internal circuits, LX switch, and external components; requires low-impedance layout to minimize noise. |
| 7 LX | Switch node (P-channel MOSFET drain) | Drives external inductor; voltage swings from near-GND to V+ + 0.3V; peak current rating is 2A. |
| 8 V+ | Main power supply input | Accepts 4V–16V; must be bypassed with 1µF ceramic + bulk electrolytic capacitor placed adjacent to pins 6 and 8. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.25V to VIN - configured via external resistor divider on CC pin, enabling flexible rail generation without multiple SKUs. |
| Fixed-frequency current-mode PWM | 160kHz operation - eliminates subharmonic oscillation, simplifies output filtering, and improves transient response vs. variable-frequency alternatives. |
| Integrated protection suite | Undervoltage lockout, cycle-by-cycle current limiting, soft-start, and thermal-safe shutdown - reduces need for external supervision circuitry. |
| Pre-validated inductor compatibility | Guaranteed performance with standard 33µH or 100µH off-the-shelf inductors - eliminates custom magnetics design and qualification effort. |
| Low-noise, low-ripple operation | No subharmonic ripple observed - enables cleaner analog/RF subsystems without additional LC filtering stages. |
Applications
| Portable Instrumentation | Computer Peripherals |
|---|---|
|
Use Scenario: Handheld multimeters and data loggers powered by 4×AA alkaline or 3S Li-ion packs with varying voltage profiles (4.8V–12.6V). IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V or 5V for MCU, ADC, and display driver from unregulated battery input. Use Value: 750mA output headroom supports burst-mode sampling; 6µA shutdown current preserves battery life during extended idle periods. |
Use Scenario: USB-powered external storage enclosures and docking stations requiring local 3.3V/5V rails from 5V USB input. IC Role / Device Role / Timing Role: Efficient buck converter supplying logic and interface ICs, replacing less-efficient linear regulators to reduce thermal load. Use Value: 85–90% efficiency minimizes heat buildup inside compact enclosures; fixed 160kHz frequency avoids USB 2.0 data band interference. |
| Cellular Radios | Portable Communications Equipment |
|
Use Scenario: Battery-operated UHF/VHF transceivers where RF section sensitivity degrades under supply ripple or dropout. IC Role / Device Role / Timing Role: Clean, well-regulated 5V supply for RF front-end and baseband processor, isolated from noisy digital switching. Use Value: Absence of subharmonic ripple and fast load-transient response (<50ms recovery) maintain RF signal integrity during TX bursts. |
Use Scenario: Ruggedized field radios and satellite communicators exposed to wide ambient temperatures (−20°C to +60°C). IC Role / Device Role / Timing Role: Main power management IC delivering regulated voltage to mixed-signal SoC and audio codec under variable input conditions. Use Value: Guaranteed operation from 0°C to +70°C (MAX758ACPA+) with ±4.5% output accuracy ensures reliable boot and runtime behavior across environmental extremes. |
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 5V designs; lacks output adjustability and programmable soft-start required for multi-rail systems. | Select MAX758ACPA+ when output voltage tuning, higher current, or controlled startup sequencing is needed. |
| TPS5430DR | 3.0V–36V input, 3A output, 500kHz switching, integrated high-side FET, requires external compensation. | Better suited for high-current industrial supplies; overqualified for portable size/power constraints and adds layout complexity. | Choose MAX758ACPA+ for cost-sensitive, space-limited portable designs where 750mA and 160kHz simplify filtering and reduce BOM count. |
Compared with LM2574N-5.0 and TPS5430DR, the MAX758ACPA+ offers a unique balance of adjustability, moderate current, low quiescent current, and DIP-package serviceability - making it optimal for legacy-compatible, battery-powered instrumentation where design simplicity and long-term component availability are prioritized.
Availability
MAX758ACPA+ is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, cellular radios, and portable communications equipment requiring stable component supply with long lifecycle support.
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 and mixed-signal ICs for power management, sensing, and communication applications.
The MAX758A belongs to Maxim's legacy high-efficiency DC-DC regulator product line, designed specifically for portable, battery-powered systems demanding compact size, low quiescent current, and robust protection without complex external circuitry.
FAQ
What is the absolute maximum input voltage rating for the MAX758ACPA+?
The MAX758ACPA+ has an absolute maximum V+ rating of +18V (with −0.3V minimum). However, its specified operational input range is 4.0V to 16.0V. Exceeding 16.0V may trigger undervoltage lockout release but risks reliability degradation; sustained operation above 16.0V is not guaranteed per datasheet specifications. Always observe the 16.0V upper limit for reliable long-term use of the MAX758ACPA+.
Can the MAX758ACPA+ generate an output voltage lower than 1.25V?
No - the MAX758ACPA+ cannot regulate below 1.25V. Its internal 1.22V reference sets the minimum feedback threshold, and the datasheet explicitly states "outputs adjustable from 1.25V to the input voltage." Attempting sub-1.25V operation results in loss of regulation and uncontrolled output collapse. For lower voltages, consider a different regulator family or post-regulation with an LDO. This limitation applies directly to the MAX758ACPA+ design.
What is the purpose of the I.C. pin on the MAX758ACPA+?
Pin 5 (I.C.) on the MAX758ACPA+ is an internal connection tied to the silicon substrate, which is electrically connected to V+. It must remain unconnected externally - no trace, wire, or component should attach to it. Connecting I.C. to any other node (including GND or signals) can disrupt internal biasing, cause latch-up, or permanently damage the MAX758ACPA+. This pin serves no user-accessible function and is strictly for internal die construction.
Does the MAX758ACPA+ require an external catch diode, and what type is recommended?
Yes - the MAX758ACPA+ requires an external Schottky or high-speed silicon rectifier as a catch diode. The 1N5817 is explicitly recommended in the datasheet for 750mA full-load operation due to its low forward voltage (~0.45V) and 1A peak current rating. Using a standard PN diode increases conduction losses and reduces efficiency; omitting the diode causes catastrophic failure. This requirement is inherent to the MAX758ACPA+ buck topology and must be implemented in every application.
How does the soft-start capacitor value affect maximum output current in the MAX758ACPA+?
The soft-start capacitor (C1) on the SS pin directly sets both startup ramp time and the maximum deliverable output current while maintaining regulation. Larger C1 values increase soft-start duration and reduce peak inrush, but also lower the current limit threshold. For example, with 0.1µF C1 and no R1, MAX758ACPA+ delivers ~750mA; with 0.47µF and no R1, max current drops to ~300mA. This trade-off is documented in Table 1 of the MAX758ACPA+ datasheet and must be accounted for in final design validation.
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:
- Active
- 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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