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Analog Devices Inc./Maxim Integrated MAX748AEWE+T
- Part No.:
- MAX748AEWE+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX748AEWE+T.pdf
- Description:
- IC REG BUCK 3.3V 500MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,004
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Product details
Overview
MAX748AEWE+T 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 85%–90% efficiency, ±5% output voltage accuracy, and 159kHz–212.5kHz fixed switching frequency - used in portable instrumentation and hand-held computers requiring compact, high-efficiency 5V-to-3.3V conversion.
For engineers reviewing the MAX748AEWE+T datasheet, MAX748AEWE+T pinout, MAX748AEWE+T application, or MAX748AEWE+T equivalent, key selection criteria include input voltage range (3.3V–16V), guaranteed 500mA output at 4.75V–16V input, 0.2µA shutdown current, programmable soft-start via SS pin, and cycle-by-cycle current limiting for robust transient response in battery-powered systems.
Technical Context
The MAX748AEWE+T 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 internal 1.23V reference and error amplifier for precise 3.3V regulation. It operates in continuous or discontinuous conduction mode depending on input voltage, load, and 22µH inductor value.
Its oscillator is factory-trimmed to 159kHz–212.5kHz over temperature and supply voltage, supporting stable filtering with small external components. Protection features include undervoltage lockout (2.7V turn-off, 2.95V turn-on), overcurrent detection (~1.2A peak), and soft-start initiated at power-up or exit from shutdown - all coordinated via the SS pin capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V ±5% over line, load, and temperature - ensures stable logic supply without external resistor divider. |
| Input Voltage Range | 3.3V to 16V - supports wide-input battery and adapter-fed systems including 12V rails and multi-cell Li-ion. |
| Max Output Current | 500mA at VIN ≥ 4.75V - delivers full rated current across industrial temperature range (-40°C to +85°C). |
| Switching Frequency | 159kHz to 212.5kHz - enables predictable EMI filtering and use of standard 22µH inductors without custom magnetics. |
| Shutdown Current | 0.2µA typical - minimizes battery drain during system sleep modes in portable applications. |
| Quiescent Supply Current | 1.7mA typical (no load) - balances light-load efficiency and fast transient response in always-on subsystems. |
| Oscillator Accuracy | ±15% over temperature - ensures consistent ripple frequency for filter design and EMI compliance planning. |
Pinout & Package
MAX748AEWE+T is housed in a 16-pin wide SO package (0.300" body width, 0.072" pitch). All pins sharing the same name must be connected externally per manufacturer specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Supply Input (pins 1, 15, 16) | Primary power input (3.3V–16V); requires parallel 1µF ceramic + bulk electrolytic bypassing close to pins. |
| LX | Power Switch Drain (pins 2, 3, 4) | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode - high dv/dt node requiring short trace routing. |
| GND | Ground (pins 5, 6, 7) | Power and signal return; must connect to low-impedance ground plane to minimize noise and ensure stability. |
| OUT | Feedback Sense (pin 8) | Connects directly to regulated 3.3V output; forms voltage divider with internal 1.23V reference for closed-loop regulation. |
| CC | Compensation Input (pin 9) | External 330pF capacitor from CC to OUT sets outer-loop stability and transient response bandwidth. |
| SS | Soft-Start Control (pin 10) | Capacitor to GND (e.g., 0.047µF) controls startup ramp time and limits inrush current; also enables overcurrent protection. |
| REF | Reference Output (pin 11) | Provides 1.23V ±1.5% bandgap reference (100µA max); requires 1000pF bypass to GND for noise immunity. |
| SHDN | Shutdown Input (pin 12) | Active-low enable; <0.25V disables regulator and reduces supply current to 0.2µA; >2.0V enables operation. |
| N.C. | No Connect (pins 13, 14) | Internally unconnected; must remain floating or tied to GND per layout best practice - no functional role. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting and superior load-transient response without external compensation. |
| Preselected 22µH inductor support | Eliminates magnetic design effort; validated for 500mA operation with <1A saturation rating - accelerates prototyping. |
| Programmable soft-start | SS pin capacitor (e.g., 0.047µF) sets controlled output ramp time and prevents inrush-induced voltage droop on shared rails. |
| Integrated protection suite | Combines undervoltage lockout (2.7V cutoff), overcurrent trip (~1.2A), and automatic SS discharge on fault - improves system reliability. |
| Low-quiescent-current shutdown | 0.2µA shutdown current extends battery life in portable devices where long standby duration is critical. |
Applications
| Portable Instrumentation | Hand-Held Computers |
|---|---|
Use Scenario: Battery-powered multimeters and data loggers requiring stable 3.3V supply from variable 3.6V–12V Li-ion packs. IC Role / Device Role / Timing Role: Primary step-down regulator converting unregulated battery voltage to clean 3.3V for microcontroller, ADC, and display drivers. Use Value: 85%–90% efficiency preserves battery runtime; 0.2µA shutdown current enables multi-month storage without recharge. |
Use Scenario: Ruggedized PDAs operating across -20°C to +70°C ambient with 5V system rail derived from 9V alkaline or 7.4V Li-poly. IC Role / Device Role / Timing Role: Fixed-output buck converter supplying 3.3V core logic and I/O rails while rejecting input ripple from noisy DC-DC stages. Use Value: ±5% output accuracy ensures reliable digital interface timing; 159kHz–212.5kHz fixed frequency simplifies EMI filter design. |
| Computer Peripherals | Cellular Phones (Legacy Baseband) |
Use Scenario: USB-powered docking stations converting 5V USB bus to isolated 3.3V for FPGA configuration and sensor interfaces. IC Role / Device Role / Timing Role: Compact, high-efficiency local regulator replacing linear regulators to reduce thermal load on PCB. Use Value: 16-pin wide SO package fits dense layouts; cycle-by-cycle current limiting protects against short-circuit faults on hot-pluggable ports. |
Use Scenario: 2G/3G feature phone baseband subsystems powered by single-cell Li-ion (3.0V–4.2V) or dual-cell (6.0V–8.4V) configurations. IC Role / Device Role / Timing Role: Main 3.3V supply for RF transceivers and application processors, handling dynamic load steps up to 500mA. Use Value: Fast transient response (<5ms recovery from 50% load step) maintains voltage stability during burst transmission; soft-start prevents brownout during boot. |
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 |
|---|---|---|---|
| MAX763AESE+ | Same 3.3V output, but 3.3V–11V input range and 8-pin SO package; 1.4mA quiescent current vs. 1.7mA. | Lower input voltage ceiling suits 5V-rail-only systems; smaller footprint saves board area but lacks LX/GND pin redundancy. | Select MAX763AESE+ when input never exceeds 11V and space-constrained layouts prioritize 8-pin SO over thermal robustness. |
| TPS62231DRYR | 3.3V output, 2.05V–6.5V input, 3MHz switching, 600mA output; 0.025µA shutdown current; 6-pin WSON package. | Higher frequency enables smaller inductors/capacitors but requires tighter layout control; narrower input range excludes 12V systems. | Choose TPS62231DRYR for ultra-low-power, space-limited designs with ≤6.5V input - not suitable for 12V/16V industrial inputs. |
Compared with MAX748AEWE+T, MAX763AESE+ trades input voltage headroom (11V vs. 16V) for smaller size and slightly lower quiescent current, while TPS62231DRYR offers higher integration and lower shutdown current at the cost of input voltage compatibility and thermal derating margin in high-power industrial use cases.
Availability
MAX748AEWE+T is available at Aetrix Electronics and suitable for portable instrumentation, hand-held computers, and computer peripherals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX748AEWE+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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing applications.
The MAX748A product line delivers high-efficiency, fixed-output step-down regulators targeting battery-powered and wide-input industrial systems needing robust, integrated DC-DC conversion without external compensation.
FAQ
What is the maximum input voltage rating for MAX748AEWE+T?
The MAX748AEWE+T 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 MAX748AEWE+T require external feedback resistors to set the 3.3V output?
No, the MAX748AEWE+T provides a fixed 3.3V output. It uses an internal resistor divider referenced to the 1.23V bandgap, so no external resistors are needed - OUT pin connects directly to the 3.3V output node for regulation sensing.
What inductor value is validated for use with MAX748AEWE+T?
A 22µH inductor is prequalified and validated for MAX748AEWE+T across its full operating range. The inductor must have an incremental saturation current rating exceeding 1A to support 500mA output with margin under worst-case conditions.
How does the soft-start function work on MAX748AEWE+T?
The MAX748AEWE+T uses the SS pin to control soft-start: a capacitor (e.g., 0.047µF) between SS and GND ramps the current-limit threshold at power-up or wake-from-shutdown, limiting inrush current and preventing output overshoot or input rail collapse.
Is MAX748AEWE+T pin-compatible with MAX763A series devices?
No, MAX748AEWE+T is not pin-compatible with MAX763A devices. It uses a 16-pin wide SO package with redundant V+, LX, and GND pins, whereas MAX763A uses an 8-pin SO or DIP. Pin functions differ in count and assignment - direct replacement requires PCB redesign.
MAX748AEWE+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:
- 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+T FAQ
1.How can I place an order for MAX748AEWE+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX748AEWE+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 MAX748AEWE+T reliable?
The price and inventory of MAX748AEWE+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX748AEWE+T is usually 5 days.
3.What payment methods are accepted for MAX748AEWE+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX748AEWE+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX748AEWE+T?
MAX748AEWE+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX748AEWE+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 MAX748AEWE+T?
For technical support, including MAX748AEWE+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX748AEWE+T requirements.
6.How does Aetrix verify that MAX748AEWE+T is sourced from the original manufacturer or authorized distributors?
All MAX748AEWE+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 MAX748AEWE+T meets industry standards.
7.What is the process for return or replacement of MAX748AEWE+T?
All MAX748AEWE+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX748AEWE+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 MAX748AEWE+T part is unused and in its original packaging.
Return procedure for MAX748AEWE+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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