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Analog Devices Inc./Maxim Integrated MAX730ACSA+
- Part No.:
- MAX730ACSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX730ACSA+.pdf
- Description:
- IC REG BUCK 5V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:130
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Product details
Overview
MAX730ACSA+ from Maxim Integrated is a 5V-output, current-mode PWM step-down DC-DC converter in an 8-pin SO package. It accepts input voltages from 5.2V to 11V, delivers up to 450mA output current at ≥85% efficiency, features 1.7mA quiescent supply current and 6µA shutdown current, and operates with fixed-frequency switching (typ. 170kHz) for low-noise portable power regulation.
For engineers reviewing the MAX730ACSA+ datasheet, MAX730ACSA+ pinout, MAX730ACSA+ application, or MAX730ACSA+ equivalent, this device is selected for compact, high-efficiency 5V conversion in battery-powered instrumentation, cellular radios, and computer peripherals where input voltage range, thermal performance, and soft-start control are critical design parameters.
Technical Context
The MAX730ACSA+ implements a current-mode PWM control architecture with dual feedback loops: an inner current-sense loop enabling cycle-by-cycle current limiting and an outer voltage loop using a 1.23V bandgap reference for ±5% output regulation across line, load, and temperature. Its oscillator frequency is tightly specified at 160kHz–190kHz over operating conditions.
It integrates a P-channel power MOSFET switch (LX pin), programmable soft-start (SS pin with external capacitor), undervoltage lockout (UVLO active at V+ < 4.45V), and shutdown control (SHDN pin). Protection includes overcurrent limiting (~1.5A peak), thermal foldback, and internal compensation via CC pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.00V ±5% - guaranteed regulation across full line/load/temperature range without external resistor divider. |
| Input Voltage Range | 5.2V to 11.0V - supports single-cell Li-ion (4.2V fully charged) plus headroom, or regulated 6–12V supplies. |
| Max Output Current | 450mA continuous - verified at V+ ≥ 6V; derates above +70°C per 5.88mW/°C SO package thermal limit. |
| Efficiency | 85% to 96% - measured at V+ = 5.5V–11V and IOUT = 0–450mA; peak near 9V input and mid-load. |
| Quiescent Current | 1.7mA - enables low standby power in always-on systems; drops to 6µA in shutdown mode. |
| Oscillator Frequency | 160kHz to 190kHz - fixed-frequency operation simplifies EMI filtering and allows use of small, standardized 100µH inductors. |
| Reference Voltage | 1.23V ±8% - internal bandgap reference supplies up to 100µA; bypassed with 0.01µF capacitor for stability. |
Pinout & Package
MAX730ACSA+ uses an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, JEDEC MS-012AC compliant. Pin 1 marked by beveled corner or dot; pins 6 and 7 internally connected to GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pull to GND to disable regulator; output falls to 0V; initiates soft-start on release. |
| 2 REF | Bandgap reference output | Provides stable 1.23V reference; max 100µA sink/source; requires 0.01µF bypass to GND. |
| 3 SS | Soft-start timing and current limit clamp | External capacitor sets startup ramp time and maximum deliverable current; 0.1µF typical. |
| 4 CC | Compensation node | Connects to OUT via 330pF capacitor to stabilize feedback loop; no external op-amp needed. |
| 5 OUT | Feedback sense input | Connected directly to +5V output; closes voltage regulation loop using internal error amplifier. |
| 6 GND | Ground reference | Power and signal ground; both GND pins (6 & 7) must be tied to PCB ground plane. |
| 7 LX | Switch node | Drain of internal P-channel MOSFET; connects to inductor and catch diode anode; handles 2A peak current. |
| 8 V+ | Input supply | Primary power input (5.2–11V); requires local 1µF ceramic + bulk electrolytic bypassing. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables precise cycle-by-cycle current limiting, fast load-transient response (<50ms recovery), and simplified loop compensation. |
| Programmable soft-start | External capacitor on SS pin controls startup slew rate and prevents inrush current; also enables short-circuit protection. |
| Integrated P-channel MOSFET | Eliminates need for external high-side switch; reduces BOM count and layout complexity in buck topology. |
| Undervoltage lockout (UVLO) | Disables operation below 4.45V (falling) and re-enables above 4.7V (rising), preventing brownout instability and MOSFET partial turn-on. |
| Single-inductor design | Guaranteed operation with standard 100µH inductor (MAX730AC grade); no custom magnetics or design iteration required. |
Applications
| Portable Instruments | Cellular Radios |
|---|---|
Use Scenario: Handheld multimeters and portable oscilloscopes powered by 2×AA/AAA or Li-ion batteries with variable voltage during discharge. IC Role / Device Role / Timing Role: Primary 5V system rail regulator converting unregulated battery voltage (5.2–11V) to stable logic supply. Use Value: 85–96% efficiency extends battery life; 6µA shutdown current preserves charge during sleep modes. | Use Scenario: RF front-end modules in analog FM/AM transceivers requiring clean, low-noise 5V bias for mixers and IF amplifiers. IC Role / Device Role / Timing Role: Low-ripple 5V supply with fixed-frequency switching (170kHz) to avoid interference in sensitive radio bands. Use Value: Fixed-frequency operation enables predictable EMI filtering; soft-start prevents RF stage disruption during power-up. |
| Computer Peripherals | Distributed Power Systems |
Use Scenario: USB-powered external storage enclosures or docking stations drawing up to 450mA from host-supplied 5V or auxiliary 9V adapters. IC Role / Device Role / Timing Role: Step-down regulator generating local 5V rail from higher adapter voltage (e.g., 9V wall adapter). Use Value: 450mA output supports multiple USB devices; SO package enables compact PCB layout in space-constrained enclosures. | Use Scenario: Industrial sensor nodes with isolated 12V or 24V backplane inputs requiring localized 5V microcontroller and interface rails. IC Role / Device Role / Timing Role: Point-of-load (POL) DC-DC converter delivering regulated 5V from intermediate bus with UVLO and overcurrent protection. Use Value: Undervoltage lockout ensures safe shutdown during bus sag; cycle-by-cycle current limiting protects against shorted sensor lines. |
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 |
|---|---|---|---|
| LM2574N-5.0 | 5V fixed-output, 0.5A, 52kHz switching frequency, requires external NPN transistor and diode; no integrated MOSFET. | Larger solution size, lower efficiency (~75%), less suitable for space-constrained portable designs. | Select when cost sensitivity outweighs board area and efficiency; verify external component selection for thermal performance. |
| TPS54202DR | 5V adjustable (via resistor divider), 2A output, 400kHz–2.5MHz programmable frequency, integrated FETs, 2.5µA shutdown current. | Higher current capability and wider input range (4.5–28V); requires feedback resistor network and more complex compensation. | Select for future-proofing or higher load margin; not drop-in due to different pinout, feedback method, and enable polarity. |
Compared with LM2574N-5.0 and TPS54202DR, the MAX730ACSA+ offers integrated P-MOSFET, fixed 5V output with no resistors, and optimized 170kHz operation for compact filter design-making it ideal for cost-sensitive, space-limited 450mA applications where simplicity and proven reliability are prioritized over programmability or ultra-low quiescent current.
Availability
MAX730ACSA+ is available at Aetrix Electronics and suitable for portable instruments, cellular radios, and computer peripherals requiring stable component supply, commercial-temperature-grade performance (0°C to +70°C), and long-term production continuity.
Supply support for MAX730ACSA+ 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 demanding industrial, communications, and consumer applications.
The MAX730A series belongs to Maxim's legacy high-efficiency DC-DC converter product line, engineered specifically for compact, low-noise 5V step-down regulation in battery-powered and distributed power systems where integration, reliability, and ease of implementation are essential.
FAQ
What is the input voltage range supported by the MAX730ACSA+?
The MAX730ACSA+ supports an input voltage range of 5.2V to 11.0V. Operation is guaranteed down to 4.7V (UVLO enable threshold) and up to 12V absolute maximum. This range accommodates nominal 6V–9V battery packs and regulated wall adapters, making the MAX730ACSA+ suitable for portable equipment with varying supply conditions.
Does the MAX730ACSA+ require external components for basic operation?
Yes, the MAX730ACSA+ requires external components: an inductor (100µH for MAX730AC grade), catch diode (e.g., 1N5817), input/output capacitors (1µF ceramic + 100µF electrolytic), soft-start capacitor (0.1µF), and 330pF compensation capacitor. No external MOSFET or feedback resistors are needed-the MAX730ACSA+ integrates the P-channel switch and fixed 5V reference.
How does the soft-start function work on the MAX730ACSA+?
The MAX730ACSA+ uses the SS pin to implement programmable soft-start: an external capacitor between SS and GND controls the ramp rate of the internal current-limit threshold. A typical 0.1µF capacitor yields ~11ms startup time at V+ = 9V and IOUT = 300mA. This prevents inrush current and stabilizes the output during power-up, and also provides short-circuit protection.
What thermal limitations apply to the MAX730ACSA+ in its SO package?
The MAX730ACSA+ in 8-pin SO package has a continuous power dissipation limit of 471mW at +70°C ambient, derating at 5.88mW/°C above that. Junction temperature must not exceed +150°C. Adequate copper pour on GND pins and proper input/output capacitor placement are critical to maintain thermal performance under 450mA load conditions.
Is the MAX730ACSA+ pin-compatible with other members of the MAX730A/MAX738A/MAX744A family?
Yes, the MAX730ACSA+, MAX738ACSA+, and MAX744ACSA+ share identical 8-pin SO pinouts and footprint. However, they differ in input voltage range, output current rating, oscillator frequency tolerance, and UVLO thresholds-so direct substitution requires validation of those parameters in the target application.
MAX730ACSA+ 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
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 5.2V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 450mA
- Frequency - Switching:
- 170kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX730ACSA+ FAQ
1.How can I place an order for MAX730ACSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX730ACSA+ 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 MAX730ACSA+ reliable?
The price and inventory of MAX730ACSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX730ACSA+ is usually 5 days.
3.What payment methods are accepted for MAX730ACSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX730ACSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX730ACSA+?
MAX730ACSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX730ACSA+ 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 MAX730ACSA+?
For technical support, including MAX730ACSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX730ACSA+ requirements.
6.How does Aetrix verify that MAX730ACSA+ is sourced from the original manufacturer or authorized distributors?
All MAX730ACSA+ 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 MAX730ACSA+ meets industry standards.
7.What is the process for return or replacement of MAX730ACSA+?
All MAX730ACSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX730ACSA+, 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 MAX730ACSA+ part is unused and in its original packaging.
Return procedure for MAX730ACSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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