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Analog Devices Inc./Maxim Integrated MAX748ACPA+
- Part No.:
- MAX748ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX748ACPA+.pdf
- Description:
- IC REG BUCK 3.3V 500MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,088
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Product details
Overview
The MAX748ACPA+ from Maxim Integrated is a 3.3V-output, current-mode PWM step-down DC-DC converter IC designed for high-efficiency power conversion in space-constrained systems. It accepts input voltages from 3.3V to 16V, delivers up to 500mA output current, operates at 159kHz–212.5kHz fixed switching frequency, achieves 85%–90% efficiency, and features 0.2µA shutdown current - ideal for battery-powered portable instruments and handheld computers.
For engineers reviewing the MAX748ACPA+ datasheet, MAX748ACPA+ pinout, MAX748ACPA+ application, or MAX748ACPA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters, real-world application mappings, and two rigorously cross-checked alternative parts for design continuity and sourcing flexibility.
Technical Context
The MAX748ACPA+ implements a current-mode PWM buck regulator architecture with dual-loop control: an inner current-sense loop enabling cycle-by-cycle current limiting (1.2A peak), and an outer voltage feedback loop using a precision 1.23V internal bandgap reference. Its oscillator is factory-trimmed to guarantee 159kHz–212.5kHz operation across temperature and supply voltage.
It integrates a P-channel power MOSFET switch, undervoltage lockout (2.7V turn-off, 2.95V turn-on), programmable soft-start via external capacitor on SS pin, and internal compensation via CC pin - eliminating need for external error amplifier or loop compensation design. The device operates in continuous conduction mode up to 500mA with a single 22µH inductor.
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 resistive divider. |
| Input Voltage Range | 3.3V to 16V - supports wide-input battery and adapter-fed systems including 12V rails and multi-cell Li-ion packs. |
| Max Output Current | 500mA guaranteed at VIN ≥ 4.75V - sufficient for powering microcontrollers, FPGAs, and peripheral ICs in portable designs. |
| Switching Frequency | 159kHz–212.5kHz - enables use of small 22µH inductors and simplifies EMI filtering with predictable fundamental harmonics. |
| Efficiency | 85%–90% typical at 100–300mA - minimizes thermal rise and extends battery life in always-on portable applications. |
| Shutdown Current | 0.2µA - preserves battery charge during system sleep modes without requiring external disconnect circuitry. |
| Quiescent Supply Current | 1.7mA typical - low bias draw maintains efficiency at light loads without sacrificing regulation accuracy. |
Pinout & Package
MAX748ACPA+ is housed in an 8-pin plastic DIP package (0°C to +70°C commercial temperature range) with through-hole mounting compatibility and standard 0.3" width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: V+ | Supply Input | Unregulated DC input (3.3V–16V); requires local 1µF ceramic + bulk electrolytic bypass to GND for stability. |
| 2: LX | Switch Node | Drain of internal P-MOSFET; connects to inductor and catch diode anode - critical for EMI layout and thermal management. |
| 3: GND | Power Ground | Primary return path for switch current and control circuitry; must be tied to low-inductance ground plane. |
| 4: OUT | Voltage Sense Input | Feedback node connected directly to regulated 3.3V output; sets regulation point via internal 1.23V reference divider. |
| 5: CC | Compensation Input | External 330pF capacitor from CC to OUT stabilizes voltage loop; no external op-amp required. |
| 6: SS | Soft-Start Control | Capacitor (e.g., 0.047µF) from SS to GND controls startup slew rate and enables short-circuit protection. |
| 7: REF | Reference Output | 1.23V bandgap reference (100µA max sink); bypassed with 1000pF to GND for noise immunity. |
| 8: SHDN | Shutdown Enable | Active-low logic input; tie to V+ for operation, ground for 0.2µA shutdown - no external pull-up needed. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables precise cycle-by-cycle current limiting (1.2A peak), fast transient response, and simplified loop compensation. |
| Integrated P-channel MOSFET | Eliminates need for external high-side switch and associated gate-drive circuitry - reduces BOM count and layout area. |
| Programmable soft-start | SS pin allows user-defined startup time and concurrent overcurrent protection activation - prevents inrush damage. |
| Undervoltage lockout (UVLO) | Automatically disables switching below 2.7V and re-enables above 2.95V - avoids brown-out operation and MOSFET stress. |
| Fixed 3.3V output with ±5% tolerance | Guaranteed regulation without external resistors - simplifies design validation and reduces calibration overhead. |
Applications
| Portable Instrument Power | Handheld Computer Core Supply |
|---|---|
Use Scenario: Powering 3.2V–3.6V logic in handheld multimeters, data loggers, and field sensors powered by 9V alkaline or 2S Li-ion batteries. IC Role / Device Role / Timing Role: Primary 3.3V buck regulator delivering up to 500mA with UVLO and soft-start to handle battery voltage sag and cold-start conditions. Use Value: Maintains stable MCU and ADC operation down to 3.3V input while consuming only 0.2µA in shutdown - extending field-use battery life. |
Use Scenario: Generating clean 3.3V core voltage for ARM-based processors and display controllers in ruggedized PDAs and industrial tablets. IC Role / Device Role / Timing Role: High-efficiency (88% @ 300mA) step-down converter with fixed-frequency PWM to minimize noise coupling into sensitive analog sections. Use Value: Delivers full 500mA at 12V input with <50mVp-p ripple using only 22µH inductor and OS-CON output capacitors - reducing board area and thermal footprint. |
| Cellular Phone Baseband Supply | Computer Peripheral Interface Power |
Use Scenario: Providing regulated 3.3V to baseband processors and RF front-end ICs in legacy 2G/3G feature phones with variable battery input (3.4V–4.2V). IC Role / Device Role / Timing Role: Low-quiescent-current (1.7mA) buck regulator with fast load-transient response to support burst-mode transmission cycles. Use Value: Achieves 90% efficiency at 100mA light-load condition and recovers within 5ms from 100mA→500mA load steps - preserving signal integrity. |
Use Scenario: Supplying 3.3V to USB host controllers, SD card interfaces, and PCIe endpoint logic in embedded PCs and docking stations. IC Role / Device Role / Timing Role: Robust DC-DC converter with overcurrent limiting and thermal-safe operation under sustained 400mA loads. Use Value: Sustains 500mA output continuously at 16V input with integrated cycle-by-cycle current limit - preventing latch-up during hot-plug events. |
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 |
|---|---|---|---|
| MAX763ACPA+ | Lower input range (3.3V–11V), same 3.3V output, 1.4mA quiescent current, 8-pin DIP package. | Optimized for 5V-input systems (e.g., USB-powered devices); not suitable for 12V or higher inputs. | Select when input never exceeds 11V and lower quiescent current is prioritized over input voltage headroom. |
| TPS62231DRVR | 3.3V fixed output, 2.05V–6.5V input, 600mA output, 3MHz switching, 12µA quiescent current, 6-pin WSON package. | Higher frequency enables smaller passive components but requires careful PCB layout; lacks integrated soft-start capacitor control. | Choose for ultra-compact designs with strict size constraints and low-noise requirements - verify UVLO and transient response match system needs. |
Compared with MAX748ACPA+, MAX763ACPA+ offers tighter input voltage compliance for 5V-centric systems, while TPS62231DRVR trades higher frequency and lower quiescent current for reduced passive size and increased layout sensitivity - making MAX748ACPA+ optimal for robust, wide-input, through-hole-compatible 3.3V power delivery.
Availability
MAX748ACPA+ is available at Aetrix Electronics and suitable for portable instruments, handheld computers, and cellular phone baseband power supplies requiring stable component supply, long-term lifecycle support, and commercial-temperature-grade reliability.
Supply support for MAX748ACPA+ 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 applications.
The MAX748A series belongs to Maxim's legacy high-efficiency DC-DC converter product line, engineered specifically for reliable, low-component-count 3.3V step-down conversion in battery-operated and wide-input industrial equipment.
FAQ
What is the maximum input voltage supported by the MAX748ACPA+?
The MAX748ACPA+ supports a maximum input voltage of 16V, with absolute maximum rating at +17V on the V+ pin. Operation above 16V risks permanent damage. The device is specified for continuous operation from 3.3V to 16V, delivering full 500mA output when input is ≥4.75V - making it suitable for 12V rail and multi-cell battery applications where input transients may reach 16V.
Does the MAX748ACPA+ require external compensation components?
Yes, the MAX748ACPA+ requires a 330pF capacitor between CC and OUT pins for stable voltage-loop compensation. This external capacitor replaces traditional op-amp-based compensation networks, simplifying design while maintaining robustness across load and temperature. No resistor network or additional op-amp is needed - the internal error amplifier and current-mode architecture eliminate complex loop tuning.
Can the MAX748ACPA+ operate from a 3.3V input to generate 3.3V output?
No, the MAX748ACPA+ cannot regulate 3.3V output from a 3.3V input because it is a buck (step-down) converter requiring a minimum input-to-output differential. The datasheet specifies minimum input as 3.3V, but regulation requires VIN > VOUT + dropout - typically ≥4.0V for stable 3.3V output. At 3.3V input, output drops below regulation and the device may enter UVLO or deliver unregulated voltage.
What is the purpose of the REF pin on the MAX748ACPA+?
REF pin on the MAX748ACPA+ outputs a precision 1.23V bandgap reference voltage, capable of sourcing up to 100µA for external circuitry. It must be bypassed to GND with a 1000pF capacitor to suppress noise and ensure stable regulation. While not required for basic 3.3V operation (which uses internal divider), REF enables custom output voltages or monitoring circuits when used with external resistive dividers.
How does the soft-start function work on the MAX748ACPA+?
The MAX748ACPA+ implements soft-start via an external capacitor on the SS pin. Charging this capacitor (e.g., 0.047µF) slowly raises the current-limit threshold, controlling output voltage ramp rate and limiting inrush current. Soft-start activates at power-up, after shutdown release, and during overcurrent or UVLO recovery - ensuring orderly startup and protecting downstream capacitors and load circuitry.
MAX748ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX748ACPA+ FAQ
1.How can I place an order for MAX748ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX748ACPA+ 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 MAX748ACPA+ reliable?
The price and inventory of MAX748ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX748ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX748ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX748ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX748ACPA+?
MAX748ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX748ACPA+ 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 MAX748ACPA+?
For technical support, including MAX748ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX748ACPA+ requirements.
6.How does Aetrix verify that MAX748ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX748ACPA+ 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 MAX748ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX748ACPA+?
All MAX748ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX748ACPA+, 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 MAX748ACPA+ part is unused and in its original packaging.
Return procedure for MAX748ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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