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Analog Devices Inc./Maxim Integrated MAX758ACWE-TG068
- Part No.:
- MAX758ACWE-TG068
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX758ACWE-TG068.pdf
- Description:
- IC REG BUCK ADJ 750MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
MAX758ACWE-TG068 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 85–92% efficiency, and features ±4.5% output voltage accuracy over line/load/temperature. It is used in portable instrumentation requiring compact, high-efficiency local regulation from unregulated battery or wall-adapter supplies.
For engineers reviewing the MAX758ACWE-TG068 datasheet, MAX758ACWE-TG068 pinout, MAX758ACWE-TG068 application, or MAX758ACWE-TG068 equivalent, key selection criteria include input voltage range (4–16V), load capability (750mA), shutdown current (6µA), soft-start programmability, and undervoltage lockout thresholds (3.5V/3.75V).
Technical Context
The MAX758ACWE-TG068 implements a current-mode PWM control architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting and an outer voltage-error loop for precise output regulation. 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 bandgap reference (REF), soft-start timing control (SS), and protection circuitry including undervoltage lockout (UVLO), overcurrent detection (~1.5A), and thermal-safe shutdown. The IC operates in continuous or discontinuous conduction mode depending on input/output conditions and inductor value.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 16.0V - supports wide-input battery-powered systems (e.g., 12V nominal rails, Li-ion stacks, or unregulated AC-DC adapters). |
| Output Current | Up to 750mA - sufficient for powering microcontrollers, sensors, and analog front-ends in portable instruments. |
| Switching Frequency | 160kHz - enables use of small, low-cost external inductors (e.g., 33µH or 100µH) without requiring custom magnetics design. |
| Efficiency | 85% to 92% - minimizes thermal rise and extends battery life in handheld devices operating at medium loads. |
| Shutdown Current | 6µA typical - ensures ultra-low quiescent drain during system sleep modes, critical for long-term battery operation. |
| Output Voltage Accuracy | ±4.5% plus external resistor tolerance - enables stable 5V or other user-adjusted outputs (1.25V to VIN) across temperature and load. |
| UVLO Thresholds | Rising: 3.75V, Falling: 3.50V - prevents erratic startup/shutdown during brown-out conditions in noisy supply environments. |
Pinout & Package
MAX758ACWE-TG068 is housed in a 16-pin wide SO (Small Outline) package with 0.300" body width, 0.050" lead pitch, and exposed thermal pad (per Maxim package drawing 21-324A). Pin 1 is marked by a notch or dot; pins are numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Power supply input | Accepts 4–16V; requires parallel 1µF ceramic + bulk electrolytic bypassing close to pin for stability. |
| LX | Switch node | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode; handles peak currents up to 2A. |
| GND | Power ground | Common return for power path and control logic; must be connected to low-impedance ground plane. |
| I.C. | Internal connection | No external connection; internally tied to substrate (connected to V+); leave floating or tie to V+ if required by layout. |
| CC | Feedback compensation | Connects to output voltage divider; 330pF capacitor between CC and output sets loop stability and transient response. |
| SS | Soft-start control | Capacitor-to-GND sets startup ramp time; 510kΩ resistor to SHDN enables current-boosted soft-start and short-circuit protection. |
| REF | Reference voltage output | 1.22V ±1.5%, supplies ≤100µA; bypass with ≤0.047µF capacitor to GND for noise immunity. |
| SHDN | Shutdown enable | Active-low; pull to GND to disable regulator and reduce supply current to 6µA; output drops to 0V. |
| N.C. | No connect | Pins 9, 10, 11, 12, 13, 14, 15, 16 - not internally connected; must remain unconnected per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast load transient response (<50ms recovery), inherent cycle-by-cycle current limiting, and simplified loop compensation. |
| Programmable soft-start | Capacitor on SS pin controls startup slew rate and limits inrush current; prevents output overshoot and stress on external components. |
| Integrated UVLO and overcurrent protection | UVLO (3.5V/3.75V) avoids partial turn-on; overcurrent comparator trips at ~1.5A and initiates soft-start recovery-no external sensing needed. |
| Fixed 160kHz switching frequency | Eliminates subharmonic ripple, simplifies EMI filter design, and allows consistent use of pre-qualified 33µH or 100µH inductors. |
| Adjustable output (1.25V to VIN) | Uses external resistor divider on CC pin; output setpoint formula R2 = R3 × ((VOUT/1.22V) − 1) enables flexible rail generation. |
Applications
| Portable Instrumentation | 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 step-down regulator converting variable battery voltage (6–16V) to stable 3.3V or 5V for MCU, ADC, and display drivers. Use Value: 750mA output supports simultaneous analog and digital subsystems; 6µA shutdown current extends battery runtime in standby. |
Use Scenario: USB-powered external storage enclosures, docking stations, and multi-function printers with auxiliary 5V rails. IC Role / Device Role / Timing Role: Local DC-DC converter generating clean 5V from noisy upstream 12V or unregulated adapter output. Use Value: Fixed 160kHz switching and absence of subharmonic ripple simplify compliance with conducted EMI limits for USB-IF certification. |
| Cellular Radios | Portable Communications Equipment |
|
Use Scenario: Battery-operated UHF/VHF transceivers and two-way radios with wide input voltage swing during transmit bursts. IC Role / Device Role / Timing Role: Regulator supplying RF power amplifier bias and baseband processor core voltage under dynamic load. Use Value: Current-mode control delivers <50ms load transient recovery; UVLO prevents dropout-induced reset during battery sag. |
Use Scenario: Ruggedized field terminals, satellite phone accessories, and military comms gear operating from 12V vehicle or battery sources. IC Role / Device Role / Timing Role: High-reliability buck converter delivering 5V/750mA in extended temperature (-40°C to +85°C) environments. Use Value: Guaranteed performance across full industrial temp range; integrated protections eliminate need for external fault management circuitry. |
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, no adjustable feedback or soft-start pin. | Suitable only where fixed 5V output suffices; lacks programmability and fine-grained protection tuning of MAX758ACWE-TG068. | Select when higher current and simpler BOM outweigh need for output adjustability and low-quiescent shutdown. |
| TPS54331DR | 3A output, 570kHz switching, integrated high-side FET, requires external compensation, 4.5–28V input. | Better suited for higher-power, space-constrained designs; lacks integrated REF and dedicated SS pin for simple soft-start implementation. | Choose for >1A loads or wider input ranges; avoid if design relies on MAX758ACWE-TG068's 1.22V REF or capacitor-programmed soft-start. |
Compared with LM2678-5.0/NOPB and TPS54331DR, MAX758ACWE-TG068 offers unique value in low-quiescent, adjustable-output, single-supply buck regulation with built-in soft-start and UVLO-ideal for cost-sensitive, battery-powered instrumentation where 750mA and 16V max input are sufficient.
Availability
MAX758ACWE-TG068 is available at Aetrix Electronics and suitable for portable instrumentation, computer peripherals, and cellular radio applications requiring stable component supply, industrial temperature support, and long-lifecycle availability.
Supply support for MAX758ACWE-TG068 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 markets.
The MAX758A product line was designed specifically for compact, efficient, and robust DC-DC conversion in portable and battery-powered equipment-emphasizing low quiescent current, integrated protection, and ease of implementation with minimal external components.
FAQ
What is the maximum input voltage rating for MAX758ACWE-TG068?
The absolute maximum input voltage for MAX758ACWE-TG068 is +18V, but its specified operating range is 4.0V to 16.0V. Operation above 16V risks exceeding power dissipation limits and may trigger undervoltage lockout recovery instability. For reliable long-term use, maintain V+ within 4–16V per the Electrical Characteristics table.
Does MAX758ACWE-TG068 require an external MOSFET?
No, MAX758ACWE-TG068 integrates a P-channel power MOSFET switch at the LX pin. No external high-side switch is needed-only an external inductor, catch diode (e.g., 1N5817), input/output capacitors, and feedback resistors are required to complete the buck regulator circuit.
How is the output voltage adjusted on MAX758ACWE-TG068?
Output voltage is adjusted using a resistor divider from VOUT to GND, with the midpoint connected to the CC pin. The formula is R2 = R3 × ((VOUT/1.22V) − 1), where R3 is typically 10–20kΩ. The 1.22V reference at REF is used implicitly in this calculation, and output accuracy includes ±4.5% plus resistor tolerances.
What is the purpose of the I.C. pin on MAX758ACWE-TG068?
The I.C. pin on MAX758ACWE-TG068 is an internal connection tied to the silicon substrate, which is electrically connected to V+. It must not be connected externally. Leaving it unconnected ensures proper substrate biasing and avoids unintended current paths that could compromise latch-up immunity or thermal performance.
Can MAX758ACWE-TG068 operate in discontinuous conduction mode (DCM)?
Yes, MAX758ACWE-TG068 automatically operates in DCM at light loads, high input voltages, or with smaller inductors (e.g., 33µH). In DCM, inductor current falls to zero each cycle, reducing efficiency slightly but improving light-load regulation and easing EMI filtering. The IC maintains stable regulation across both CCM and DCM regions without external intervention.
MAX758ACWE-TG068 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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-TG068 FAQ
1.How can I place an order for MAX758ACWE-TG068 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX758ACWE-TG068 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-TG068 reliable?
The price and inventory of MAX758ACWE-TG068 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX758ACWE-TG068 is usually 5 days.
3.What payment methods are accepted for MAX758ACWE-TG068?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX758ACWE-TG068 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX758ACWE-TG068?
MAX758ACWE-TG068 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX758ACWE-TG068 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-TG068?
For technical support, including MAX758ACWE-TG068 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX758ACWE-TG068 requirements.
6.How does Aetrix verify that MAX758ACWE-TG068 is sourced from the original manufacturer or authorized distributors?
All MAX758ACWE-TG068 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-TG068 meets industry standards.
7.What is the process for return or replacement of MAX758ACWE-TG068?
All MAX758ACWE-TG068 units undergo pre-shipment inspection (PSI). If there is an issue with MAX758ACWE-TG068, 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-TG068 part is unused and in its original packaging.
Return procedure for MAX758ACWE-TG068:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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