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Analog Devices Inc./Maxim Integrated MAX758AEPA+
- Part No.:
- MAX758AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX758AEPA+.pdf
- Description:
- IC REG BUCK ADJ 750MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,085
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Product details
Overview
The MAX758AEPA+ 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 input voltages from 4V to 16V, delivers up to 750mA load 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, high-efficiency local regulation from wide-input battery or adapter supplies.
For engineers reviewing the MAX758AEPA+ datasheet, MAX758AEPA+ pinout, MAX758AEPA+ application, or MAX758AEPA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, and real-world design implications - including soft-start timing control, undervoltage lockout thresholds, and inductor selection guidance for -40°C to +85°C industrial operation.
Technical Context
The MAX758AEPA+ implements a current-mode PWM control architecture with inner-cycle current sensing and outer-voltage error amplification. It integrates a P-channel power MOSFET switch (LX pin), 1.22V ±1% bandgap reference (REF), and programmable soft-start (SS) with external capacitor timing. Its oscillator is trimmed to 160kHz (typ) and remains stable across temperature and input voltage variations.
It features cycle-by-cycle current limiting (trip point ~1.5A), undervoltage lockout (UVLO rising threshold = 3.75V, falling = 3.50V), and shutdown control via active-low SHDN pin. Output voltage is adjusted externally using a resistor divider from VOUT to CC pin, with feedback accuracy of ±4.5% plus resistor tolerance over line, load, and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 16.0V - supports single-cell Li-ion (4.2V) up to 12V wall adapters without external pre-regulation. |
| Output Current | 750mA maximum - sufficient for powering microcontrollers, sensors, and analog front-ends in portable systems. |
| Switching Frequency | 160kHz fixed - enables use of small, low-cost 33µH or 100µH inductors with predictable EMI filtering behavior. |
| Efficiency | 85% to 90% typical at 5V/300mA - reduces thermal load and extends battery life in energy-constrained applications. |
| Shutdown Current | 6µA typical - ensures minimal battery drain during system sleep or standby modes. |
| Reference Voltage | 1.22V ±1% - sets output adjust range from 1.25V to VIN; tolerance directly impacts final output accuracy. |
| Quiescent Current | 1.7mA typical - defines no-load power loss when regulating; critical for always-on subsystems. |
Pinout & Package
MAX758AEPA+ uses an 8-pin plastic DIP (dual in-line package) with 0.300" body width and 0.100" lead pitch. Pin 1 is bottom-left corner when notch faces up; pin numbering follows standard DIP convention (counter-clockwise).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pull to GND to disable regulator; output drops to 0V; internal reference and oscillator halt; 6µA supply current maintained. |
| 2 REF | 1.22V bandgap reference output | Supplies ≤100µA; bypass with ≤0.047µF capacitor to GND; used as precision feedback reference for external dividers. |
| 3 SS | Soft-start timing and current limit clamp | Connect 0.1µF capacitor to GND; controls startup slew rate and limits peak inductor current during fault recovery. |
| 4 CC | Feedback compensation node | Connects to external voltage divider; 330pF capacitor from CC to VOUT stabilizes loop; sets output voltage per R2/R3 ratio. |
| 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 all internal circuits; requires low-impedance connection to system ground plane near V+ and LX pins. |
| 7 LX | Switch node (P-channel MOSFET drain) | Drives external inductor; swings from GND to V+ + 0.3V; peak current rating 2A; requires short, low-inductance trace routing. |
| 8 V+ | Main power supply input | Accepts 4V–16V; bypass with 1µF ceramic + bulk electrolytic capacitor; UVLO activates below 3.5V (falling) or above 3.75V (rising). |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 1.25V to VIN via external resistor divider - enables flexible rail generation (e.g., 3.3V, 2.5V, 1.8V) without redesigning PCB layout. |
| Integrated P-channel MOSFET | Eliminates need for external high-side switch - simplifies BOM, reduces footprint, and improves reliability versus discrete FET solutions. |
| Programmable soft-start | Capacitor-controlled ramp prevents inrush current - avoids input voltage sag and protects upstream power sources during cold start. |
| Undervoltage lockout (UVLO) | 3.75V turn-on / 3.50V turn-off hysteresis - prevents erratic operation during brown-out conditions and ensures clean power-up sequencing. |
| Overcurrent protection | Cycle-by-cycle limiting at ~1.5A - maintains safe operation under short-circuit or overload without thermal shutdown delay. |
| Low-noise fixed-frequency PWM | No subharmonic ripple - enables predictable EMI filter design and eliminates need for complex multi-pole filtering in sensitive analog sections. |
Applications
| Portable Instrumentation | Computer Peripherals |
|---|---|
|
Use Scenario: Handheld multimeters and data loggers powered by 2xAA or Li-ion batteries with variable voltage during discharge. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V or 5V rail for MCU, ADC, and display driver. Use Value: Wide 4V–16V input range accommodates full battery discharge curve; 750mA output supports active measurement cycles without dropout. |
Use Scenario: USB-powered external storage enclosures requiring clean 5V and 3.3V rails from noisy host-supplied 5V. IC Role / Device Role / Timing Role: Local post-regulator improving PSRR and reducing conducted noise on downstream SATA or USB PHY supplies. Use Value: 160kHz fixed frequency allows deterministic EMI filtering; low 1.7mA quiescent current minimizes idle power draw. |
| Cellular Radios | Portable Communications Equipment |
|
Use Scenario: Half-duplex transceivers in land-mobile radio systems where battery voltage varies from 6.4V (fully charged) to 4.2V (depleted). IC Role / Device Role / Timing Role: Efficient buck converter supplying RF power amplifier bias and baseband processor core voltage. Use Value: UVLO prevents unstable operation below 3.75V; 85–90% efficiency preserves battery runtime during transmit bursts. |
Use Scenario: Tactical satellite modems operating in harsh environments with extended temperature requirements (-40°C to +85°C). IC Role / Device Role / Timing Role: Industrial-grade DC-DC regulator delivering regulated 5V to FPGA, RF front-end, and memory subsystems. Use Value: AE-grade temperature rating ensures reliable startup and regulation across full military-grade ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2678-5.0/NOPB | Fixed 5V output; 500mA max; 63kHz switching; no adjustable feedback or soft-start pin. | Suitable only for fixed-rail designs; lacks flexibility for multi-voltage systems or custom soft-start timing. | Select only if 5V output suffices and board space allows larger inductor due to lower frequency. |
| TPS5430DDAR | 3A output; 500kHz switching; integrated N-MOSFET; requires external bootstrap capacitor and compensation network. | Better suited for high-current, compact designs but increases design complexity and component count. | Choose when >750mA load or smaller solution size is required; not drop-in compatible with MAX758AEPA+ layout. |
Compared with LM2678-5.0/NOPB and TPS5430DDAR, the MAX758AEPA+ offers unique value in adjustable output, built-in soft-start control, and simplified external component requirements - making it optimal for cost-sensitive, medium-current portable systems needing design flexibility and robustness across temperature.
Availability
MAX758AEPA+ is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, cellular radios, and tactical communications equipment requiring stable component supply across industrial temperature ranges.
Supply support for MAX758AEPA+ 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, automotive, and communications markets.
The MAX758A product line was designed specifically for compact, efficient, and robust DC-DC conversion in battery-powered portable systems - emphasizing ease of use, minimal external components, and guaranteed performance across extended temperature ranges.
FAQ
What is the input voltage range supported by the MAX758AEPA+?
The MAX758AEPA+ supports an input voltage range of 4.0V to 16.0V. This wide range allows direct operation from single-cell Li-ion batteries (up to 4.2V), dual-cell alkaline packs (up to 3.2V, requiring boost assist), or unregulated 12V wall adapters. The device incorporates undervoltage lockout that disables operation below 3.50V (falling) and re-enables at 3.75V (rising), ensuring reliable startup and shutdown behavior.
Can the MAX758AEPA+ be used to generate a 3.3V output?
Yes, the MAX758AEPA+ can generate a precise 3.3V output using an external resistor divider connected between VOUT, CC, and GND. With the internal 1.22V reference, setting R3 = 10kΩ and R2 = 17.2kΩ yields 3.3V (±4.5% plus resistor tolerance). The CC pin also accepts a 330pF compensation capacitor to ensure loop stability across load and temperature variations.
What inductor value is recommended for the MAX758AEPA+ in industrial temperature applications?
For MAX758AEPA+ (AE-grade, -40°C to +85°C), a 33µH inductor is recommended per Maxim's validated design guidelines. The inductor must have ≥1A saturation current rating and <0.8Ω DC resistance. Surface-mount types like Sumida CD105-33ON or through-hole RCH895-330M are qualified for this grade and ensure guaranteed 750mA output performance without custom magnetics design.
How does the soft-start function work on the MAX758AEPA+?
The MAX758AEPA+ implements soft-start via the SS pin: connecting a capacitor (e.g., 0.1µF) between SS and GND creates a controlled voltage ramp that gradually increases the current-limit threshold during startup. This prevents inrush current, limits peak inductor current, and ensures orderly power-up. A 510kΩ resistor from SS to SHDN adds current boost for higher-current applications, extending soft-start time as needed.
Is the MAX758AEPA+ pin-compatible with other members of the MAX750A/MAX758A family?
Yes, the MAX758AEPA+ shares identical pinout and package (8-pin plastic DIP) with MAX750AEPA+, MAX758ACPA+, and MAX750ACPA+. However, key electrical differences exist: MAX758A supports 4V–16V input (vs. 4V–11V for MAX750A) and delivers 750mA (vs. 450mA), so direct substitution requires verification of input voltage and load current margins in the target application.
MAX758AEPA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX758AEPA+ FAQ
1.How can I place an order for MAX758AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX758AEPA+ 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 MAX758AEPA+ reliable?
The price and inventory of MAX758AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX758AEPA+ is usually 5 days.
3.What payment methods are accepted for MAX758AEPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX758AEPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX758AEPA+?
MAX758AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX758AEPA+ 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 MAX758AEPA+?
For technical support, including MAX758AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX758AEPA+ requirements.
6.How does Aetrix verify that MAX758AEPA+ is sourced from the original manufacturer or authorized distributors?
All MAX758AEPA+ 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 MAX758AEPA+ meets industry standards.
7.What is the process for return or replacement of MAX758AEPA+?
All MAX758AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX758AEPA+, 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 MAX758AEPA+ part is unused and in its original packaging.
Return procedure for MAX758AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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