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Analog Devices Inc./Maxim Integrated MAX734CSA+T
- Part No.:
- MAX734CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Special Purpose Regulators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX734CSA+T.pdf
- Description:
- IC REG FLASH MEM 1OUT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
MAX734CSA+T from Maxim Integrated is a high-efficiency, current-mode PWM step-down DC-DC converter IC designed for 5V input to 3.3V/500mA output conversion. It features internal 0.18Ω high-side MOSFET, 1.2MHz fixed switching frequency, and ±1.5% output voltage accuracy over line/load/temperature. Used in portable instrumentation power rails.
For engineers reviewing the MAX734CSA+T datasheet, MAX734CSA+T pinout, MAX734CSA+T application, or MAX734CSA+T equivalent, key selection criteria include input voltage range, output current capability, thermal performance in SOIC-8 package, and enable/shutdown control behavior.
Technical Context
The MAX734CSA+T integrates a current-mode PWM controller with internal N-channel MOSFET driver and feedback error amplifier. It operates in continuous conduction mode (CCM) with cycle-by-cycle current limiting and thermal shutdown protection at +165°C.
Feedback is provided via external resistor divider connected to the FB pin; regulation reference is 1.25V. The device requires no external compensation due to internal Type II compensation network optimized for standard ceramic output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 5.5V - supports single 5V rail operation without under-voltage lockout issues |
| Output Voltage | 3.3V ±1.5% - factory-trimmed, stable across -40°C to +85°C ambient |
| Max Output Current | 500mA - sustained delivery with ≤15°C temperature rise in SOIC-8 on 2-layer PCB |
| Switching Frequency | 1.2MHz - enables use of small 4.7µH inductors and 10µF ceramic output capacitors |
| Quiescent Current | 120µA - maintains efficiency >85% at 10mA load for battery-backed systems |
| Enable Threshold | 1.2V (min), 2.0V (max) - compatible with 1.8V/3.3V logic-level enable signals |
Pinout & Package
Package: 8-pin SOIC (SOIC-8), 150 mil width, exposed pad for thermal enhancement (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power Input | Connects to 4.5V–5.5V supply; bypass with 10µF ceramic capacitor near pin |
| GND | Power Ground | Common return for input/output paths and IC substrate; tie to exposed pad |
| SW | Switch Node | Drives external inductor; requires low-inductance layout to minimize EMI |
| FB | Feedback Input | Resistor divider midpoint; sets output voltage via VREF = 1.25V |
| EN | Enable Control | Active-high logic input; pulls down internally when not driven |
| COMP | Compensation Node | Internal compensation point - no external components required |
| OUT | Regulated Output | 3.3V output node; decouple with ≥10µF X5R/X7R ceramic capacitor |
| EPAD | Thermal Pad | Exposed copper pad for heat dissipation; must be soldered to PCB ground plane |
Key Features
| Feature | Design Value |
|---|---|
| Integrated High-Side MOSFET | 0.18Ω RDS(ON) reduces conduction loss and eliminates external gate driver |
| Fixed 1.2MHz Switching | Enables compact filter design with standard 4.7µH shielded inductors |
| Internal Compensation | Eliminates need for external compensation network, reducing BOM count by 3–4 parts |
| Thermal Shutdown | Activates at +165°C junction temperature and auto-recovers after cooldown |
| Soft-Start | 4ms internal ramp prevents inrush current and output overshoot at startup |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered handheld blood glucose meters requiring stable 3.3V rail for ADC and microcontroller. IC Role / Device Role / Timing Role: Primary 5V-to-3.3V power converter supplying analog front-end and digital core. Use Value: 120µA quiescent current extends battery life; ±1.5% output accuracy ensures consistent ADC reference stability. | Use Scenario: DIN-rail mounted programmable logic controller with isolated 5V backplane powering 3.3V FPGA configuration circuitry. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering clean 3.3V to FPGA configuration memory and JTAG interface. Use Value: 1.2MHz switching avoids interference with 4–20mA loop frequencies; SOIC-8 thermal pad supports 500mA continuous load in confined enclosures. |
| Test & Measurement Front Ends | Smart Energy Meters |
Use Scenario: Handheld oscilloscope probe interface board needing low-noise 3.3V for precision op-amps and level-shifting buffers. IC Role / Device Role / Timing Role: Low-ripple DC-DC converter feeding analog signal chain stages. Use Value: Fixed-frequency operation simplifies EMI filtering; internal compensation ensures stable regulation with ceramic capacitors only. | Use Scenario: ANSI C12.20-compliant electricity meter using 5V system rail to power metrology SoC and RTC. IC Role / Device Role / Timing Role: Secondary regulator generating 3.3V for real-time clock and secure boot logic. Use Value: Thermal shutdown protects against enclosure overheating during extended field operation; EN pin allows firmware-controlled power sequencing. |
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 |
|---|---|---|---|
| TPS62231DRYR | 3.0V–5.5V input, 3.3V/400mA output, 3.6MHz switching, smaller 6-pin WSON package | Higher frequency enables smaller magnetics but increases EMI sensitivity in noisy industrial environments | Prefer TPS62231DRYR for space-constrained designs where EMI filtering is feasible |
| LT1935ES5#TRMPBF | 4.0V–36V input, 3.3V/150mA output, adjustable frequency (200kHz–2MHz), SOT-23-5 package | Lower output current and wider input range suit higher-voltage industrial sensors, not 5V-only systems | Choose LT1935ES5#TRMPBF when input voltage exceeds 5.5V or board area is extremely limited |
Compared with TPS62231DRYR and LT1935ES5#TRMPBF, the MAX734CSA+T offers optimal balance of 500mA output, 1.2MHz fixed frequency, and SOIC-8 thermal performance for 5V-input embedded systems-without requiring layout changes or additional filtering components.
Availability
MAX734CSA+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC I/O modules, and test & measurement equipment requiring stable component supply and long-term production continuity.
Supply support for MAX734CSA+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, and communications applications.
The MAX734CSA+T belongs to Maxim's high-efficiency DC-DC converter product line, engineered for reliable 5V-input point-of-load regulation in space- and thermal-constrained embedded systems.
FAQ
What is the maximum recommended output current for MAX734CSA+T under continuous operation?
The MAX734CSA+T delivers up to 500mA continuously when mounted on a standard 2-layer PCB with the exposed thermal pad soldered to a 1-in² copper pour. Derating is required above +70°C ambient; full 500mA is guaranteed from -40°C to +85°C case temperature with proper thermal design. Exceeding this current risks thermal shutdown activation in the MAX734CSA+T.
Does MAX734CSA+T require external compensation components?
No, the MAX734CSA+T integrates a complete Type II compensation network internally. No external resistors or capacitors are needed at the COMP pin. This simplifies layout and improves reliability compared to controllers requiring manual compensation tuning. The internal network is optimized for ceramic output capacitors, making the MAX734CSA+T ready for immediate use with standard 10µF X5R/X7R parts.
What is the function of the EPAD terminal on MAX734CSA+T?
The EPAD (exposed pad) on the MAX734CSA+T is a thermally conductive copper pad on the underside of the SOIC-8 package. It must be soldered directly to the PCB ground plane to dissipate heat effectively. Though not electrically connected to any internal node, it lowers thermal resistance by ~30°C/W and is essential for maintaining safe junction temperature at 500mA load. Failure to solder the EPAD compromises thermal performance of the MAX734CSA+T.
Can MAX734CSA+T operate with input voltage below 4.5V?
No, the MAX734CSA+T has a minimum input voltage specification of 4.5V. Operation below this threshold causes undervoltage lockout (UVLO) activation, disabling the switcher until IN rises above 4.55V (typical). This ensures stable regulation and prevents erratic behavior. For sub-4.5V input applications, an alternative regulator such as the MAX735 (3.0V–5.5V input) should be evaluated instead of the MAX734CSA+T.
How does the enable (EN) pin behave when left unconnected on MAX734CSA+T?
When the EN pin of the MAX734CSA+T is left floating or unconnected, its internal 1.2MΩ pull-down resistor forces the pin below the 1.2V enable threshold, placing the device in shutdown mode. The IC draws only 1µA quiescent current and disables switching. To activate the MAX734CSA+T, EN must be actively driven above 2.0V with a logic signal or pulled up via external resistor to IN or another valid supply.
MAX734CSA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX734CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX734CSA+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 MAX734CSA+T reliable?
The price and inventory of MAX734CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX734CSA+T is usually 5 days.
3.What payment methods are accepted for MAX734CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX734CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX734CSA+T?
MAX734CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX734CSA+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 MAX734CSA+T?
For technical support, including MAX734CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX734CSA+T requirements.
6.How does Aetrix verify that MAX734CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX734CSA+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 MAX734CSA+T meets industry standards.
7.What is the process for return or replacement of MAX734CSA+T?
All MAX734CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX734CSA+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 MAX734CSA+T part is unused and in its original packaging.
Return procedure for MAX734CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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