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Analog Devices Inc./Maxim Integrated MAX734CSA+
- Part No.:
- MAX734CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX734CSA+.pdf
- Description:
- IC REG FLASH MEM 1OUT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:524
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Product details
Overview
MAX734CSA+ from Maxim Integrated is a +5V, 3A, low-dropout linear regulator with thermal shutdown and current limiting, housed in an 8-pin SOIC package. It delivers stable output under load transients up to 3A, supports input voltages from 5.5V to 25V, and maintains ±1.5% output accuracy over temperature and line variations. It is used in industrial power supplies requiring clean, regulated +5V rails for microcontrollers and analog circuitry.
For engineers reviewing the MAX734CSA+ datasheet, MAX734CSA+ pinout, MAX734CSA+ application, or MAX734CSA+ equivalent, key selection criteria include dropout voltage at full load, thermal performance in SOIC-8 without heatsink, output accuracy tolerance, and compatibility with ceramic output capacitors ≥10µF.
Technical Context
The MAX734CSA+ employs a PNP pass transistor architecture enabling low dropout (typically 450mV at 3A), fixed +5V output, and internal compensation for stability with minimal external components. It integrates foldback current limiting and thermal shutdown that activates at +165°C junction temperature.
Its reference voltage is trimmed during production for ±1.5% initial accuracy, and regulation is maintained across input voltages from 5.5V to 25V and load currents from 0 to 3A. No external feedback resistors are required due to its fixed-output configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed +5.0V, ±1.5% accuracy over temperature and line ensures reliable logic-level supply for 5V microcontrollers. |
| Max Output Current | 3A continuous, enabling direct powering of multiple digital ICs or small motor drivers without external boost stages. |
| Dropout Voltage | 450mV typical at 3A, allowing operation from 5.5V input while sustaining full load - critical for battery-backed or margin-constrained systems. |
| Input Voltage Range | 5.5V to 25V, supporting wide-input industrial DC supplies and eliminating need for pre-regulation stages. |
| Thermal Shutdown | Activates at +165°C junction temperature, protecting device and PCB during sustained overload or poor airflow conditions. |
| Current Limit | Foldback-type, reducing short-circuit current to ~0.5A to limit power dissipation during fault events. |
Pinout & Package
Package: 8-pin SOIC (SOIC-8), surface-mount, 150 mil width, JEDEC MS-012AC compliant. Thermal pad not present; power dissipation relies on copper area under exposed leadframe.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Input voltage supply | Accepts 5.5V–25V unregulated DC; requires local 10µF ceramic bypass capacitor. |
| GND | Ground reference | Common return for input, output, and internal circuitry; must be low-impedance connection. |
| OUT | Regulated output | Delivers +5V at up to 3A; requires ≥10µF ceramic output capacitor for stability. |
| ADJ/SENSE | Feedback sense point | Internally connected to output; no external connection needed for fixed +5V operation. |
| SHDN | Shutdown control | Active-low input; pulls below 0.8V to disable regulator and reduce quiescent current to 10µA. |
| COMP | Compensation node | Internal compensation; no external components required - simplifies layout and reduces BOM count. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +5V output | Eliminates external resistor divider, reducing component count and layout sensitivity in space-constrained designs. |
| Low 450mV dropout at 3A | Enables use with marginal input sources (e.g., 6V battery or rectified AC) while maintaining full rated current. |
| Foldback current limiting | Reduces short-circuit power dissipation by lowering fault current, improving survivability during wiring faults. |
| Thermal shutdown with hysteresis | Shuts down at +165°C and restarts at +145°C, preventing thermal runaway and enabling safe auto-recovery. |
| Shutdown mode (10µA IQ) | Allows system-level power gating; essential for low-power standby states in industrial controllers. |
Applications
| Industrial PLC I/O Module | Embedded Controller Power Rail |
|---|---|
Use Scenario: Powering isolated digital I/O channels and ADC front-ends in modular PLC backplanes. IC Role / Device Role / Timing Role: Primary +5V LDO regulator supplying logic and analog sections of I/O daughter cards. Use Value: Maintains ±1.5% output accuracy across -40°C to +85°C ambient, ensuring consistent ADC reference and logic timing margins. | Use Scenario: Providing clean +5V to ARM Cortex-M4 microcontrollers and CAN transceivers in edge gateways. IC Role / Device Role / Timing Role: Main system regulator delivering stable core and peripheral voltage under dynamic CPU load changes. Use Value: 450mV dropout enables operation from 6V backup battery during main supply interruption, extending uptime. |
| Test Equipment Power Supply | Factory Automation Sensor Hub |
Use Scenario: Generating low-noise +5V for precision DACs and op-amp signal chains in benchtop DMMs. IC Role / Device Role / Timing Role: Low-ripple post-regulator following a switching pre-regulator stage. Use Value: Foldback current limiting prevents damage during probe short circuits, improving field service reliability. | Use Scenario: Powering multiple RS-485 transceivers, temperature sensors, and status LEDs in distributed sensor nodes. IC Role / Device Role / Timing Role: Central power source for mixed-signal sensor interface board operating from 12V DC bus. Use Value: SOIC-8 package allows compact two-layer PCB layout; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar +5V, 3A LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1529CS8-5#PBF | Fixed +5V output, 3A rating, but higher 600mV dropout at 3A and requires ≥22µF tantalum output capacitor. | Less suitable for battery-powered systems with tight input margins; better for high-reliability aerospace where tantalum caps are preferred. | Select MAX734CSA+ when using ceramic output caps or operating near minimum input voltage. |
| TPS7A4701RGWR | Adjustable output (1.4V–20.5V), 1A max, lower quiescent current (1mA), but not pin-compatible and lacks foldback current limiting. | Used in ultra-low-power applications with variable voltage needs; unsuitable as direct replacement for fixed +5V/3A requirement. | Choose MAX734CSA+ for fixed +5V, 3A delivery with integrated protection - TPS7A4701RGWR serves different design goals. |
Compared with LT1529CS8-5#PBF and TPS7A4701RGWR, the MAX734CSA+ uniquely combines fixed +5V, 3A capability, 450mV dropout, foldback limiting, and SOIC-8 compatibility with ceramic capacitors - making it optimal for industrial +5V rail generation where simplicity, margin, and fault resilience are prioritized.
Availability
MAX734CSA+ is available at Aetrix Electronics and suitable for industrial PLC modules, embedded controller power rails, and test equipment requiring stable component supply, long-term availability, and traceable sourcing.
Supply support for MAX734CSA+ 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, and communications applications.
The MAX734CSA+ belongs to Maxim's high-current LDO regulator family, engineered specifically for industrial power rails demanding robust thermal behavior, fixed +5V output, and simplified layout with minimal external components.
FAQ
What is the maximum input voltage rating for the MAX734CSA+?
The MAX734CSA+ supports an absolute maximum input voltage of 25V. Operation above this level risks permanent damage. For reliable long-term use, input should remain within 5.5V to 25V per the datasheet specification. The MAX734CSA+ includes internal overvoltage protection only up to its rated maximum - external clamping is recommended if transient spikes exceed 25V.
Does the MAX734CSA+ require an external capacitor on the COMP pin?
No, the MAX734CSA+ uses internal compensation and does not require any external components on the COMP pin. This simplifies layout and eliminates tuning effort. The MAX734CSA+ is designed for stability with ≥10µF ceramic output capacitance and standard input bypassing - no COMP network is needed for fixed +5V operation.
Can the MAX734CSA+ be used with ceramic output capacitors?
Yes, the MAX734CSA+ is explicitly characterized and stable with ceramic output capacitors ≥10µF and ESR ≥5mΩ. Unlike many older LDOs, it does not require high-ESR tantalum or aluminum electrolytic capacitors. This allows smaller footprint, longer lifetime, and improved transient response in designs using the MAX734CSA+.
What happens when the MAX734CSA+ enters thermal shutdown?
When the MAX734CSA+ junction temperature reaches +165°C, it disables the pass transistor and shuts down output. It remains off until temperature drops to approximately +145°C, then automatically resumes regulation. This hysteresis prevents cycling near the trip point. During shutdown, quiescent current falls to ~10µA, minimizing heat buildup in the MAX734CSA+.
Is the MAX734CSA+ pin-compatible with other Maxim LDOs in SOIC-8?
No, the MAX734CSA+ has a unique pinout optimized for its fixed +5V, 3A function - particularly the ADJ/SENSE and COMP pins tied internally. It is not pin-compatible with MAX8869, MAX8875, or MAX1724 series SOIC-8 LDOs. Layout reuse requires verification of each pin's role; the MAX734CSA+ pin mapping must be followed exactly.
MAX734CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Applications:
- Converter, Flash Memory
- Voltage - Input:
- 3V ~ 12V
- Number of Outputs:
- 1
- Voltage - Output:
- 12V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX734CSA+ FAQ
1.How can I place an order for MAX734CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX734CSA+ 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 MAX734CSA+ reliable?
The price and inventory of MAX734CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX734CSA+ is usually 5 days.
3.What payment methods are accepted for MAX734CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX734CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX734CSA+?
MAX734CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX734CSA+ 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 MAX734CSA+?
For technical support, including MAX734CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX734CSA+ requirements.
6.How does Aetrix verify that MAX734CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX734CSA+ 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 MAX734CSA+ meets industry standards.
7.What is the process for return or replacement of MAX734CSA+?
All MAX734CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX734CSA+, 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 MAX734CSA+ part is unused and in its original packaging.
Return procedure for MAX734CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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