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Analog Devices Inc./Maxim Integrated MAX758ACWE+T
- Part No.:
- MAX758ACWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX758ACWE+T.pdf
- Description:
- IC REG BUCK ADJ 750MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,539
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Product details
Overview
MAX758ACWE+T 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 4V–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 - used in portable communications equipment requiring compact, high-efficiency power conversion.
For engineers reviewing the MAX758ACWE+T datasheet, MAX758ACWE+T pinout, MAX758ACWE+T application, or MAX758ACWE+T equivalent, key selection considerations include its 160kHz current-mode control architecture, 750mA load capability with cycle-by-cycle current limiting, soft-start and undervoltage lockout protection, and compatibility with pre-selected 33µH or 100µH inductors for rapid design implementation.
Technical Context
The MAX758ACWE+T implements a current-mode PWM control loop with inner current-sense feedback and outer voltage-error amplification, enabling precise regulation and fast transient response. Its oscillator operates at a stable 160kHz (typical), with minimal variation across temperature and supply voltage, and eliminates subharmonic ripple to simplify output filtering.
It integrates a P-channel power MOSFET switch (LX pin), 1.22V bandgap reference (REF), soft-start timing control (SS), and shutdown logic (SHDN) with 6µA quiescent current. Protection includes cycle-by-cycle current limiting, overcurrent detection (~1.5A), undervoltage lockout (3.5V turn-off / 3.75V turn-on), and thermal-safe operation up to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 16.0V - supports wide-input battery and unregulated DC supplies without external pre-regulation. |
| Output Current | Up to 750mA - sufficient for powering microcontrollers, RF modules, and analog circuitry in portable systems. |
| Switching Frequency | 160kHz (typical) - enables use of small, low-cost external inductors (e.g., 33µH or 100µH) and simplifies EMI filtering. |
| Reference Voltage | 1.22V ±3% - sets output voltage via external resistor divider; tolerance contributes directly to overall output accuracy. |
| Quiescent Current | 1.7mA (typical) - minimizes no-load power loss in always-on subsystems; drops to 6µA in shutdown mode. |
| Output Voltage Accuracy | ±4.5% plus external resistor tolerance - guaranteed over full line, load, and temperature range (0°C to +70°C). |
| Shutdown Threshold | 0.25V (max) logic-low threshold - ensures reliable disable under noisy or weak-drive conditions. |
Pinout & Package
MAX758ACWE+T is housed in a 16-pin wide SO (small-outline) package with 0.300" body width and 0.050" lead pitch. Pin 1 is marked by a beveled corner; pins are arranged in two rows (1–8 top, 9–16 bottom), with V+, LX, GND, REF, SHDN, SS, CC, and I.C. terminals distributed for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 15, 16 | V+ | Power input (4V–16V); multiple pins reduce trace resistance and improve current handling and thermal dissipation. |
| 3, 4 | LX | Drain of internal P-channel MOSFET; connects to inductor and catch diode; handles peak switch currents up to 2A. |
| 6, 7, 13, 14 | GND | Power and signal ground return; multiple pins minimize ground impedance and stabilize feedback loop. |
| 5 | REF | 1.22V bandgap reference output; supplies ≤100µA; bypass with ≤0.047µF capacitor for stability. |
| 8 | SHDN | Active-low shutdown control; pulls output to 0V when grounded; draws <1.0µA leakage in active state. |
| 9 | SS | Soft-start timing node; capacitor to GND controls startup slew rate and limits inrush current during power-up. |
| 10 | CC | Feedback compensation input; connects to output voltage divider and 330pF compensation capacitor for loop stability. |
| 11, 12 | I.C. | Internal connection - no external connection permitted; tied internally to substrate (V+ referenced). |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast load transient response and inherent cycle-by-cycle current limiting without external sense resistors. |
| Pre-selected inductor support | Guaranteed operation with standard 33µH or 100µH inductors - eliminates custom magnetics design and accelerates prototyping. |
| Integrated protection suite | Includes undervoltage lockout (3.5V/3.75V thresholds), soft-start, and overcurrent shutdown - prevents fault propagation and improves system reliability. |
| Low-noise fixed-frequency operation | 160kHz switching with no subharmonic ripple allows predictable EMI filtering and reduces output capacitor ESR requirements. |
| Adjustable output (1.25V to VIN) | Set via external resistor divider on CC pin; supports flexible rail generation for mixed-signal, RF, and digital subsystems. |
Applications
| Portable Communications Equipment | Computer Peripherals |
|---|---|
|
Use Scenario: Powering GSM/GPRS radio modules and baseband processors in handheld transceivers. IC Role / Device Role / Timing Role: Primary buck regulator converting single-cell Li-ion (4.2V) or dual-cell NiMH (3.6V–16V) to stable 3.3V or 5V rails. Use Value: Delivers 750mA at >87% efficiency with minimal thermal rise in space-constrained enclosures. |
Use Scenario: Supplying regulated 5V to USB hubs, card readers, and external storage controllers. IC Role / Device Role / Timing Role: Step-down converter accepting wide-input wall-adapter or battery sources while maintaining tight output regulation. Use Value: 1.7mA quiescent current extends standby time; shutdown mode reduces supply current to 6µA for host-controlled power gating. |
| Cellular Phones & Radios | Portable Instruments |
|
Use Scenario: Generating clean 2.8V core voltage for RF front-end ICs and low-noise amplifiers. IC Role / Device Role / Timing Role: High-efficiency, low-ripple buck regulator placed near RF section to minimize conducted noise coupling. Use Value: Absence of subharmonic ripple and fixed 160kHz frequency enable effective LC filtering to meet stringent RF spectral mask requirements. |
Use Scenario: Providing stable 5V and adjustable auxiliary rails for precision ADCs, op-amps, and sensor interfaces. IC Role / Device Role / Timing Role: Adjustable-output regulator supporting multiple voltage domains from a single battery source. Use Value: ±4.5% output accuracy over temperature ensures measurement integrity; REF pin enables local reference buffering. |
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; 63V max input; 5A output; requires external MOSFET; no integrated soft-start or UVLO. | Suitable for higher-current, fixed-voltage industrial supplies - not adjustable or low-quiescent for portable use. | Select only if fixed 5V output and >1A load are required; board layout and compensation differ significantly. |
| TPS54331DR | 3.5V–28V input; 3A output; 570kHz switching; integrated high-side FET; requires external compensation. | Better suited for high-efficiency, high-density designs needing >1A loads and smaller inductors - lacks built-in soft-start timing control. | Choose when higher output current and faster transient response are critical; expect added design effort for loop compensation. |
Compared with LM2678-5.0/NOPB and TPS54331DR, the MAX758ACWE+T offers superior integration for portable applications - combining adjustable output, soft-start, UVLO, and low 1.7mA quiescent current in a single 16-pin SO package optimized for 750mA loads and rapid time-to-market.
Availability
MAX758ACWE+T is available at Aetrix Electronics and suitable for portable communications equipment, computer peripherals, cellular radios, and portable instrumentation requiring stable component supply and long-term production continuity.
Supply support for MAX758ACWE+T 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 demanding applications.
The MAX750A/MAX758A product line was designed specifically for compact, efficient DC-DC conversion in battery-powered portable electronics - emphasizing low quiescent current, integrated protection, and ease of implementation with off-the-shelf magnetics.
FAQ
What is the maximum input voltage rating for the MAX758ACWE+T?
The MAX758ACWE+T has an absolute maximum input voltage rating of +18V on the V+ pin, with recommended operating range from 4.0V to 16.0V. Exceeding 16.0V during normal operation risks exceeding power dissipation limits and may trigger undervoltage lockout recovery behavior. The device is rated for continuous operation up to 16.0V per its electrical characteristics table.
Does the MAX758ACWE+T require an external MOSFET?
No, the MAX758ACWE+T integrates a P-channel power MOSFET switch connected to the LX pin. No external high-side switch is needed - only an external catch diode (e.g., 1N5817), inductor, output capacitor, and feedback resistors are required to implement a complete buck regulator. This integration reduces bill-of-materials count and PCB area.
How is the output voltage adjusted on the MAX758ACWE+T?
The MAX758ACWE+T output voltage is adjusted using an external resistor divider connected between VOUT, CC pin, and GND. With the internal 1.22V reference applied to CC, the output follows VOUT = 1.22V × (1 + R2/R3). For example, R3 = 13.0kΩ and R2 = 40.2kΩ yields ~5.0V. Output accuracy remains ±4.5% over temperature plus resistor tolerance.
What is the purpose of the I.C. pins on the MAX758ACWE+T?
The I.C. pins (pins 11 and 12) on the MAX758ACWE+T are internal connections tied to the silicon substrate, which is electrically connected to V+. These pins must remain unconnected externally - no traces, vias, or components should attach to them. Improper connection may disrupt internal biasing or cause latch-up due to substrate potential mismatch.
Can the MAX758ACWE+T operate in discontinuous conduction mode (DCM)?
Yes, the MAX758ACWE+T automatically operates in either continuous conduction mode (CCM) or discontinuous conduction mode (DCM) depending on input voltage, output voltage, load current, and inductor value. At light loads or high input-to-output ratios, inductor current decays to zero during the off-time - entering DCM. The IC maintains regulation and protection functionality in both modes.
MAX758ACWE+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX758ACWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX758ACWE+T 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+T reliable?
The price and inventory of MAX758ACWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX758ACWE+T is usually 5 days.
3.What payment methods are accepted for MAX758ACWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX758ACWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX758ACWE+T?
MAX758ACWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX758ACWE+T 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+T?
For technical support, including MAX758ACWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX758ACWE+T requirements.
6.How does Aetrix verify that MAX758ACWE+T is sourced from the original manufacturer or authorized distributors?
All MAX758ACWE+T 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+T meets industry standards.
7.What is the process for return or replacement of MAX758ACWE+T?
All MAX758ACWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX758ACWE+T, 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+T part is unused and in its original packaging.
Return procedure for MAX758ACWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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