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Analog Devices Inc./Maxim Integrated MAX748AEWE+
- Part No.:
- MAX748AEWE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX748AEWE+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,947
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Product details
Overview
The MAX748AEWE+ from Maxim Integrated is a -40°C to +85°C, 16-pin wide SO packaged, 3.3V-output, current-mode PWM step-down DC-DC converter accepting 3.3V–16V input and delivering up to 500mA load current with ±5% output voltage accuracy, 159–212.5kHz fixed switching frequency, and 0.2µA shutdown supply current. It is used in industrial portable instrumentation requiring stable 3.3V rail generation from wide-input unregulated sources.
For engineers reviewing the MAX748AEWE+ datasheet, MAX748AEWE+ pinout, MAX748AEWE+ application, or MAX748AEWE+ equivalent, key selection criteria include input voltage range (3.3V–16V), guaranteed 500mA output at 4.75V–16V, 16-pin wide SO thermal performance (762mW at +70°C), soft-start programmability via external capacitor, and cycle-by-cycle current limiting for robust transient handling.
Technical Context
The MAX748AEWE+ implements a current-mode PWM buck regulator architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting and improved load-transient response, and an outer voltage loop using a 1.23V bandgap reference (±50ppm/°C drift) and error amplifier for precise 3.3V regulation. The oscillator operates at 159–212.5kHz over temperature with 0.04%/°C stability.
It integrates a P-channel power MOSFET switch (1.0Ω on-resistance), undervoltage lockout (2.7V turn-off, 2.95V turn-on), programmable soft-start (via SS pin capacitor), and overcurrent protection (1.2A trip threshold). Shutdown is active-low on SHDN, reducing supply current to 0.2µA while discharging the SS capacitor and disabling the internal reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3V ±5% over line, load, and temperature - ensures reliable logic-level compliance for 3.3V microcontrollers and peripherals. |
| Input Voltage Range | 3.3V to 16V - supports direct battery operation (e.g., 4-cell Li-ion or 12V industrial rails) without pre-regulation. |
| Max Output Current | 500mA at VIN ≥ 4.75V - delivers sufficient power for mid-complexity embedded systems with multiple I/O and sensors. |
| Switching Frequency | 159kHz to 212.5kHz - enables use of small 22µH inductors and simplifies EMI filtering with predictable fundamental harmonics. |
| Shutdown Current | 0.2µA typical - extends battery life in always-on portable devices during sleep modes. |
| Quiescent Supply Current | 1.7mA typical - minimizes no-load power loss in systems with intermittent operation. |
| Efficiency | 88% at 300mA / 5VIN - reduces thermal load and improves system energy efficiency versus linear regulators. |
Pinout & Package
MAX748AEWE+ is housed in a 16-pin wide SO package (0.300" body width) with exposed thermal pad (not electrically connected), rated for 762mW continuous power dissipation at +70°C (derated 9.52mW/°C above).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Supply Voltage Input (pins 1, 15, 16) | Accepts 3.3V–16V input; requires parallel 1µF ceramic + bulk electrolytic bypass; substrate connection. |
| LX | Switch Node (pins 2, 3, 4) | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode; swing from GND to V+ + 0.3V. |
| GND | Ground (pins 5, 6, 7) | Power and signal return; must be low-inductance connection to minimize noise and ensure stability. |
| OUT | Output Voltage Sense (pin 8) | Feedback input tied directly to regulated 3.3V output; sets regulation point via internal 1.23V reference divider. |
| CC | Compensation Pin (pin 9) | Connects to OUT via 330pF capacitor to stabilize outer voltage loop and optimize transient response. |
| SS | Soft-Start Control (pin 10) | Capacitor-to-GND sets startup ramp time and limits peak inrush current; also enables short-circuit protection. |
| REF | Reference Output (pin 11) | 1.23V ±50ppm/°C bandgap source; supplies ≤100µA; requires 1000pF bypass to GND for noise immunity. |
| SHDN | Shutdown Input (pin 12) | Active-low control: <0.25V = shutdown (0.2µA IQ); >2.0V = normal operation; initiates SS cycle on wake-up. |
| N.C. | No Connect (pins 13, 14) | Internally unconnected; must remain floating or grounded per layout best practices - no functional role. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables precise cycle-by-cycle current limiting (1.2A threshold), fast load-transient recovery (<5ms), and simplified compensation design. |
| Programmable soft-start | External capacitor on SS pin controls startup slew rate and prevents inrush current damage to input capacitors and PCB traces. |
| Integrated P-channel MOSFET | Eliminates need for external high-side switch; 1.0Ω on-resistance supports 500mA output with minimal conduction loss. |
| Undervoltage lockout (UVLO) | Prevents erratic operation during brown-out: disables switching below 2.7V and re-enables only above 2.95V with controlled SS ramp. |
| Fixed-frequency operation | 159–212.5kHz switching allows predictable EMI filtering and consistent inductor sizing (22µH standard value). |
Applications
| Industrial Portable Instruments | Hand-Held Computers |
|---|---|
|
Use Scenario: Battery-powered multimeters and data loggers operating from 3.6V–14.4V Li-ion packs with strict standby current budgets. IC Role / Device Role / Timing Role: Primary 3.3V power rail generator with shutdown-controlled deep-sleep mode and UVLO protection against cell depletion. Use Value: 0.2µA shutdown current extends battery life to years in storage; ±5% output accuracy ensures ADC reference stability across temperature. |
Use Scenario: Ruggedized handheld terminals used in warehouse inventory management with frequent power cycling and variable battery charge states. IC Role / Device Role / Timing Role: Main system regulator converting wide-input battery voltage to clean 3.3V for ARM Cortex-M MCU, display driver, and RF transceiver. Use Value: 500mA capability supports simultaneous LCD backlight and BLE transmission; soft-start prevents reset glitches during cold boot. |
| Computer Peripherals | 5V-to-3.3V Conversion |
|
Use Scenario: USB-powered external storage enclosures requiring isolated 3.3V for SATA controller and flash memory interface. IC Role / Device Role / Timing Role: Secondary regulator deriving 3.3V from upstream 5V USB bus, rejecting USB port ripple and voltage sag. Use Value: 88% efficiency at 300mA minimizes heat buildup in sealed plastic enclosures; 1.7mA quiescent current avoids excessive USB suspend drain. |
Use Scenario: Legacy 5V board designs upgrading to 3.3V logic without redesigning entire power architecture. IC Role / Device Role / Timing Role: Drop-in replacement for linear regulators (e.g., LM1117-3.3) to improve efficiency and reduce thermal stress on PCB. Use Value: Replaces inefficient LDOs with 85–90% efficiency, cutting power dissipation by >70% at 300mA and enabling smaller heatsinks or no heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX763AEWE+ | Same pinout, but 3.3V–11V input range and 1.4mA quiescent current; lower max input voltage limits use in 12V+ systems. | Suitable for 5V-input-only or low-voltage battery apps (e.g., 3S Li-ion max 12.6V); not viable where 16V input tolerance is required. | Select MAX763AEWE+ only when input never exceeds 11V - saves cost and slightly lowers IQ, but sacrifices 16V headroom. |
| TPS62231DRVR | 3MHz fixed-frequency, 3.3V/600mA sync buck; 2.05V–6.5V input; 17µA IQ; 2mm × 2mm WSON-6 package. | Better suited for space-constrained, ultra-low-IQ portable apps; lacks UVLO, soft-start programmability, and high-voltage tolerance. | Choose TPS62231DRVR for compact, low-power consumer wearables; avoid for industrial 16V-input or robust fault-protection needs. |
Compared with MAX763AEWE+, the MAX748AEWE+ provides 5V higher input voltage margin and 0.3mA higher quiescent current - critical for 12–16V battery systems. Versus TPS62231DRVR, it trades higher IQ and larger package for ruggedized protection features and wider input flexibility.
Availability
MAX748AEWE+ is available at Aetrix Electronics and suitable for industrial portable instrumentation, hand-held computers, computer peripherals, and 5V-to-3.3V conversion applications requiring stable component supply across extended temperature (-40°C to +85°C) and long-term production continuity.
Supply support for MAX748AEWE+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX748A product line was designed specifically for rugged, wide-input-voltage step-down regulation in portable and industrial equipment where reliability under voltage transients and thermal stress is essential.
FAQ
What is the maximum input voltage rating for the MAX748AEWE+?
The MAX748AEWE+ has an absolute maximum input voltage rating of +17V on the V+ pin. Its operational input range is specified as 3.3V to 16V, with guaranteed 500mA output performance from 4.75V to 16V. Exceeding 17V risks permanent damage per Absolute Maximum Ratings.
Does the MAX748AEWE+ require an external MOSFET?
No, the MAX748AEWE+ integrates a P-channel power MOSFET switch with 1.0Ω typical on-resistance. No external high-side switch is needed - only an external Schottky catch diode (e.g., 1N5817), 22µH inductor, and input/output capacitors are required for basic operation.
How does the soft-start function work on the MAX748AEWE+?
The MAX748AEWE+ uses the SS pin to implement programmable soft-start: a capacitor (e.g., 0.047µF) between SS and GND controls the ramp rate of the internal current-limit threshold. This limits inrush current, prevents output overshoot, and initiates automatic discharge during overcurrent or UVLO faults.
What is the purpose of the REF pin on the MAX748AEWE+?
REF on the MAX748AEWE+ outputs a precision 1.23V ±50ppm/°C bandgap reference voltage, capable of sourcing up to 100µA. It must be bypassed to GND with a 1000pF capacitor to suppress noise and ensure stable regulation - it is not intended as a general-purpose reference for external circuitry.
Can the MAX748AEWE+ operate with input voltages below 3.3V?
No - the MAX748AEWE+ requires a minimum input voltage of 3.3V to maintain regulation. Below this, undervoltage lockout activates (turning off the switch at ~2.7V), and the output collapses. Operation down to 3.0V is possible only in non-regulated, dropout-like behavior with rapidly degrading output voltage and current capability.
MAX748AEWE+ 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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.3V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Current - Output:
- 500mA
- Frequency - Switching:
- 180kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX748AEWE+ FAQ
1.How can I place an order for MAX748AEWE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX748AEWE+ 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 MAX748AEWE+ reliable?
The price and inventory of MAX748AEWE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX748AEWE+ is usually 5 days.
3.What payment methods are accepted for MAX748AEWE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX748AEWE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX748AEWE+?
MAX748AEWE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX748AEWE+ 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 MAX748AEWE+?
For technical support, including MAX748AEWE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX748AEWE+ requirements.
6.How does Aetrix verify that MAX748AEWE+ is sourced from the original manufacturer or authorized distributors?
All MAX748AEWE+ 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 MAX748AEWE+ meets industry standards.
7.What is the process for return or replacement of MAX748AEWE+?
All MAX748AEWE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX748AEWE+, 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 MAX748AEWE+ part is unused and in its original packaging.
Return procedure for MAX748AEWE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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