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Analog Devices Inc./Maxim Integrated MAX758ACWE+
- Part No.:
- MAX758ACWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX758ACWE+.pdf
- Description:
- IC REG BUCK ADJ 750MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,790
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Product details
Overview
The MAX758ACWE+ from Maxim Integrated is an adjustable-output, current-mode PWM step-down DC-DC switching regulator in a 16-pin wide SO package. It accepts input voltages from 4V to 16V, delivers up to 750mA output current, operates at 160kHz fixed frequency, achieves up to 92% efficiency, and features 6µA shutdown supply current - ideal for space-constrained portable instrumentation requiring stable 5V rail generation from battery or unregulated wall-adapter sources.
For engineers reviewing the MAX758ACWE+ datasheet, MAX758ACWE+ pinout, MAX758ACWE+ application, or MAX758ACWE+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters (including V+ range, load capability, oscillator frequency, reference voltage, and protection features), and real-world design guidance for buck converter implementation with minimal external components.
Technical Context
The MAX758ACWE+ implements a current-mode PWM control architecture with inner-cycle current sensing and outer-voltage loop regulation, enabling precise output control and fast transient response. Its 160kHz oscillator provides fixed-frequency operation, eliminating subharmonic ripple and simplifying EMI filtering.
It integrates a P-channel power MOSFET switch (LX pin), 1.22V ±1.5% bandgap reference (REF), soft-start timing control (SS), undervoltage lockout (UVLO thresholds: 3.75V rising / 3.50V falling), cycle-by-cycle current limiting (~1.5A peak), and active-low shutdown (SHDN) with 6µA quiescent draw.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 16.0V - supports single-cell Li-ion (4.2V) through 12V lead-acid or wall adapters without pre-regulation. |
| Output Current | Up to 750mA - sufficient for powering microcontrollers, sensors, and analog front-ends in portable instruments. |
| Switching Frequency | 160kHz - enables use of compact 33µH or 100µH inductors and reduces EMI compared to higher-frequency alternatives. |
| Reference Voltage | 1.22V ±4.5% over temp - sets output via external resistor divider; tolerance directly impacts final output accuracy. |
| Efficiency | Up to 92% at 750mA - minimizes thermal rise in sealed enclosures and extends battery runtime. |
| Shutdown Current | 6µA typical - critical for low-power sleep modes in battery-operated devices. |
| UVLO Thresholds | Rising: 3.75V, Falling: 3.50V - prevents erratic startup/shutdown during brownout conditions. |
Pinout & Package
MAX758ACWE+ is housed in a 16-pin wide SO (small-outline) package with 0.300" body width and 0.050" pitch. Pin 1 is marked by a notch or dot; pins are numbered counterclockwise. All V+ and LX pins must be connected in parallel externally per datasheet requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | V+ | Supply input - bypass with 1µF ceramic + bulk electrolytic; all four pins must be tied together externally. |
| 3, 4, 7 | LX | Switch node - connects to inductor and catch diode anode; handles high dI/dt; requires short, low-inductance routing. |
| 6, 11, 12 | GND | Power ground - connect to low-impedance ground plane; separate analog and power ground paths recommended. |
| 5 | I.C. | Internal connection - no external connection permitted; floating internally. |
| 8, 13 | CC | Feedback compensation - connects to output voltage divider and 330pF capacitor for loop stability. |
| 9 | SS | Soft-start - controls startup surge and overcurrent protection timing via external RC network (e.g., 0.1µF + 510kΩ). |
| 10 | REF | 1.22V reference output - supplies ≤100µA; bypass with 0.01µF capacitor to GND for noise immunity. |
| 14 | SHDN | Active-low shutdown - pull to GND to disable regulator and reduce supply current to 6µA. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 1.25V to V+ - set via external resistor divider on CC pin; enables flexible rail generation (e.g., 3.3V, 5V, 12V) without changing IC. |
| Pre-Selected Inductor Support | 33µH or 100µH - eliminates custom inductor design; validated for full 750mA load across temperature and line ranges. |
| Integrated Protection | Undervoltage lockout, cycle-by-cycle current limit, soft-start, and thermal foldback - ensures robust operation under fault conditions without external circuitry. |
| Low Quiescent Current | 1.7mA operating / 6µA shutdown - extends battery life in always-on or duty-cycled portable systems. |
| No Subharmonic Ripple | Fixed-frequency PWM - avoids beat frequencies and simplifies output filtering; enables clean 50mVp-p ripple with standard capacitors. |
Applications
| Portable Instruments | Computer Peripherals |
|---|---|
|
Use Scenario: Handheld multimeters, data loggers, and portable oscilloscopes powered by 9V alkaline or Li-ion batteries. IC Role / Device Role / Timing Role: Primary 5V/3.3V step-down regulator supplying MCU, ADC, and display drivers. Use Value: 750mA output and 92% efficiency enable >10-hour runtime on two AA cells; UVLO prevents measurement corruption during battery depletion. |
Use Scenario: USB-powered external storage enclosures, docking stations, and monitor accessories requiring isolated 5V rails. IC Role / Device Role / Timing Role: Secondary regulator generating clean 5V from noisy upstream USB or adapter-derived 12V input. Use Value: Fixed 160kHz switching allows predictable EMI filtering; soft-start prevents inrush-triggered host port reset. |
| Cellular Radios | Portable Communications Equipment |
|
Use Scenario: Battery-powered UHF/VHF transceivers and amateur radio handhelds with variable input (6–16V). IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 5V to RF front-end, microcontroller, and audio codec. Use Value: 4–16V input range accommodates fully charged LiPo (12.6V) down to depleted state (6V); 6µA shutdown preserves standby time. |
Use Scenario: Ruggedized field radios, satellite modems, and tactical comms gear operating from vehicle batteries (12–14V) or portable packs. IC Role / Device Role / Timing Role: High-reliability buck regulator powering baseband processor, memory, and interface logic. Use Value: Cycle-by-cycle current limiting protects against antenna mismatch faults; 1.22V reference enables accurate voltage scaling for analog circuits. |
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, 5A capability, 260kHz switching, TO-220/HSOP-8 package. | Not adjustable; higher current but larger footprint and no soft-start control. | Choose when fixed 5V output suffices and higher load current (>750mA) is required; not suitable for multi-rail or battery-input designs needing adjustment. |
| TPS54331DR | 3A output, 570kHz switching, integrated high-side FET, 1.5% reference, SOIC-8 package. | Higher frequency demands smaller magnetics but increases EMI sensitivity; lacks dedicated REF pin for precision feedback. | Prefer for compact, high-efficiency designs where 3A headroom and smaller inductors justify trade-offs in layout complexity and cost. |
Compared with LM2678-5.0/NOPB and TPS54331DR, the MAX758ACWE+ offers unique value in adjustable output, ultra-low shutdown current (6µA), and proven 33µH/100µH inductor compatibility - making it optimal for battery-powered portable instruments where flexibility, efficiency, and component count matter most.
Availability
MAX758ACWE+ is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, cellular radios, and portable communications equipment requiring stable component supply with guaranteed commercial-temperature performance (0°C to +70°C).
Supply support for MAX758ACWE+ 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 MAX750A/MAX758A product line was designed specifically for compact, efficient, and reliable step-down conversion in portable battery-powered systems - emphasizing low quiescent current, simple external component requirements, and robust protection features.
FAQ
What is the maximum input voltage rating for the MAX758ACWE+?
The MAX758ACWE+ has an absolute maximum input voltage (V+) rating of +18V, with guaranteed operation across 4.0V to 16.0V. This range supports common battery chemistries including 3-cell NiMH (4.5V), single-cell LiPo (4.2V), and 12V lead-acid systems. Exceeding 16V may trigger undervoltage lockout or cause reliability degradation over time.
Can the MAX758ACWE+ generate a 3.3V output, and how is it configured?
Yes, the MAX758ACWE+ can generate a precise 3.3V output using an external resistor divider on the CC pin. With the internal 1.22V reference, select R3 = 10kΩ and calculate R2 = 10kΩ × ((3.3V / 1.22V) − 1) ≈ 17.1kΩ. Use 1% tolerance resistors to maintain output accuracy within ±4.5% plus resistor tolerance, as specified in the MAX758ACWE+ datasheet.
Does the MAX758ACWE+ require an external catch diode, and what type is recommended?
Yes, the MAX758ACWE+ requires an external Schottky catch diode connected between LX and GND. The 1N5817 is explicitly recommended in the MAX758ACWE+ datasheet for 750mA operation due to its 1A peak current rating, low forward voltage (~0.45V), and fast recovery. Using a silicon rectifier would increase conduction losses and reduce efficiency.
How does the soft-start function work on the MAX758ACWE+, and what components are needed?
The MAX758ACWE+ uses the SS pin to implement programmable soft-start via an external RC network. A typical configuration uses a 0.1µF capacitor from SS to GND and a 510kΩ resistor from SS to SHDN. This limits inrush current, prevents output overshoot, and initiates a controlled startup sequence - especially critical when powering sensitive analog circuitry or large output capacitors.
Is the MAX758ACWE+ pin-compatible with the MAX750A series?
No, the MAX758ACWE+ is not pin-compatible with the MAX750A series. While both share functional pin roles, the MAX758ACWE+ uses a 16-pin wide SO package with duplicated V+, LX, and GND pins (requiring external paralleling), whereas the MAX750A uses an 8-pin DIP/SO. Layout, PCB footprint, and external connections differ fundamentally - direct substitution requires board redesign.
MAX758ACWE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX758ACWE+ FAQ
1.How can I place an order for MAX758ACWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX758ACWE+ 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 MAX758ACWE+ reliable?
The price and inventory of MAX758ACWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX758ACWE+ is usually 5 days.
3.What payment methods are accepted for MAX758ACWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX758ACWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX758ACWE+?
MAX758ACWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX758ACWE+ 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 MAX758ACWE+?
For technical support, including MAX758ACWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX758ACWE+ requirements.
6.How does Aetrix verify that MAX758ACWE+ is sourced from the original manufacturer or authorized distributors?
All MAX758ACWE+ 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 MAX758ACWE+ meets industry standards.
7.What is the process for return or replacement of MAX758ACWE+?
All MAX758ACWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX758ACWE+, 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 MAX758ACWE+ part is unused and in its original packaging.
Return procedure for MAX758ACWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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