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Analog Devices Inc./Maxim Integrated MAX750ACSA+
- Part No.:
- MAX750ACSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX750ACSA+.pdf
- Description:
- IC REG BUCK ADJ 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,651
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Product details
Overview
MAX750ACSA+ from Maxim Integrated is a CMOS step-down DC-DC switching regulator with adjustable output voltage, designed for high-efficiency power conversion in space-constrained portable systems. It operates from 4V to 11V input, delivers up to 450mA load current, features 160kHz current-mode PWM control, and achieves 85–92% efficiency at 5V output. Used in battery-powered instrumentation and peripherals where low quiescent current (1.7mA active, 6µA shutdown) and subharmonic-free ripple are critical.
For engineers reviewing the MAX750ACSA+ datasheet, MAX750ACSA+ pinout, MAX750ACSA+ application, or MAX750ACSA+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating parameters across temperature and load, and real-world design implications for buck converter implementation - including soft-start timing, undervoltage lockout thresholds, and inductor selection guidance.
Technical Context
The MAX750ACSA+ employs current-mode pulse-width modulation with an inner current-sense loop and outer voltage-error loop, enabling cycle-by-cycle current limiting and fast transient response. Its fixed 160kHz switching frequency eliminates subharmonic ripple, simplifying EMI filtering and allowing use of small external components like a single 33µH or 100µH inductor.
It integrates a 1.22V ±1% bandgap reference (100µA drive capability), programmable soft-start via external capacitor on SS pin, and protection features including undervoltage lockout (3.5V fall / 3.75V rise), overcurrent limiting (~1.5A peak), and thermal-safe shutdown. The internal P-channel MOSFET switch drives the LX pin with 0.5Ω typical on-resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.0V to 11.0V - supports single-cell Li-ion (4.2V) and multi-cell alkaline/NiMH stacks without pre-regulation. |
| Output Current | Up to 450mA - sufficient for powering microcontrollers, sensors, and interface ICs in portable instruments. |
| Switching Frequency | 160kHz - enables use of compact, low-cost inductors (33µH/100µH) and reduces audible noise vs. lower-frequency alternatives. |
| Efficiency | 85–92% at 5V/300mA - minimizes thermal stress and extends battery life in handheld devices. |
| Quiescent Current | 1.7mA typical - ensures low standby power draw during active operation; drops to 6µA in shutdown mode. |
| Reference Voltage | 1.22V ±4.5% over temp - sets output accuracy when used with external resistor divider; tolerance includes feedback network error. |
| Undervoltage Lockout | 3.5V (fall), 3.75V (rise) - prevents erratic startup and brownout operation during battery discharge. |
Pinout & Package
MAX750ACSA+ is housed in an 8-pin SO (Small Outline) package, 3.9mm × 4.9mm body, 1.27mm pitch, RoHS-compliant lead finish. Pin 1 marked by beveled corner or dot; pins numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SHDN | Active-low shutdown control | Pulling low disables internal FET, drops output to 0V, and reduces supply current to 6µA; tie to V+ for normal operation. |
| 2 REF | 1.22V bandgap reference output | Provides stable reference for feedback network; bypass with ≤0.047µF capacitor to GND for stability. |
| 3 SS | Soft-start timing and current limit clamp | Capacitor to GND sets soft-start ramp time and limits inrush; 0.1µF yields ~6ms start-up at 9V input. |
| 4 CC | Feedback compensation node | Connects to voltage divider output; 330pF capacitor to output sets loop compensation for wide input range stability. |
| 5 I.C. | Internal connection (no external use) | Internally wired; must remain unconnected to avoid malfunction or damage. |
| 6 GND | Power and signal ground reference | Low-impedance return path for LX switch current and analog circuits; requires solid ground plane layout. |
| 7 LX | Switch node (P-channel MOSFET drain) | Drives external inductor; rated for 2A peak current; voltage swings from GND to V+ +0.3V during operation. |
| 8 V+ | Positive supply input | Accepts 4–11V; bypass with 1µF ceramic + bulk electrolytic capacitor placed adjacent to pins 6 and 8. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 1.25V to VIN - set via external resistor divider on CC pin; supports custom rail generation without multiple SKUs. |
| Current-Mode PWM Control | 160kHz fixed frequency - delivers precise regulation and superior load transient response (<50mV deviation at 20–300mA step). |
| Integrated Protection | Undervoltage lockout, cycle-by-cycle current limiting, soft-start, and thermal-safe shutdown - eliminates need for discrete fault management circuitry. |
| No Inductor Design Required | Validated with 33µH or 100µH off-the-shelf inductors - reduces BOM cost and design cycle time for production-grade buck converters. |
| Low Shutdown Current | 6µA typical - enables long-term battery storage without significant self-discharge in portable medical or metering devices. |
Applications
| Portable Instruments | Computer Peripherals |
|---|---|
Use Scenario: Handheld multimeters, data loggers, and portable oscilloscopes powered by 2–3 AA/AAA cells or Li-ion batteries. IC Role / Device Role / Timing Role: Primary step-down regulator generating stable 3.3V or 5V rails for MCU, ADC, and display drivers. Use Value: 85–92% efficiency preserves battery runtime; 1.7mA quiescent current minimizes idle drain; soft-start prevents sensor initialization glitches. |
Use Scenario: USB-powered hubs, external SSD enclosures, and docking stations requiring clean, regulated auxiliary power. IC Role / Device Role / Timing Role: Secondary DC-DC converter deriving 3.3V/5V from 5V USB input or higher-voltage adapter supplies. Use Value: Fixed 160kHz switching avoids USB 2.0/3.0 interference bands; no subharmonic ripple simplifies compliance testing. |
| Cellular Radios | Portable Communications Equipment |
Use Scenario: Low-power UHF/VHF transceivers and RFID readers operating from 6–9V battery packs. IC Role / Device Role / Timing Role: Power management IC supplying RF front-end bias and baseband processor core voltage. Use Value: 450mA output sustains transmit bursts; undervoltage lockout prevents RF distortion during battery sag; LX pin robustness handles noisy switching environments. |
Use Scenario: Two-way radios, satellite communicators, and field-deployable modems with variable input sources (battery, vehicle, solar). IC Role / Device Role / Timing Role: Input-flexible buck regulator adapting 4–11V inputs to consistent 3.3V logic and 5V analog rails. Use Value: Wide input range accommodates aging batteries and unregulated adapters; 1.22V reference enables accurate voltage scaling across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX758ACSA+ | Wider 4–16V input range, 750mA output, 160kHz oscillator (vs. MAX750A's 160kHz), same SO-8 package. | Supports higher-input systems (e.g., 12V automotive accessories); delivers 67% more current but requires larger inductor for full-load stability. | Select MAX758ACSA+ when input exceeds 11V or >450mA load is required; verify LX voltage rating (V+ +0.3V) and thermal derating (471mW @ +70°C). |
| TPS62231DRVR | 3MHz switching, 600mA output, 2.05–6.0V input, integrated sync rectifier, 22µA quiescent current. | Better suited for ultra-thin devices needing minimal footprint; lacks soft-start programmability and UVLO hysteresis of MAX750ACSA+. | Choose TPS62231DRVR for space-constrained, low-IQ designs where 3MHz allows tiny 1µH inductors; avoid if soft-start timing control or ruggedized UVLO is critical. |
Compared with MAX758ACSA+, the MAX750ACSA+ offers tighter input voltage matching for 9V nominal systems and lower thermal load at 450mA, while the TPS62231DRVR trades robust protection features for ultra-small size and nanoscale quiescent current - making each suitable for distinct subsystem power requirements.
Availability
MAX750ACSA+ is available at Aetrix Electronics and suitable for portable instruments, computer peripherals, and cellular radios requiring stable component supply, long-lifecycle support, and guaranteed commercial-temperature performance (0°C to +70°C).
Supply support for MAX750ACSA+ 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 MAX750A series was designed as a cost-optimized, easy-to-use current-mode buck regulator targeting battery-powered portable equipment where reliability, efficiency, and minimal external component count were primary design goals.
FAQ
What is the maximum output current of the MAX750ACSA+?
The MAX750ACSA+ delivers up to 450mA continuous output current under specified conditions: input voltage 4–11V, output set to 5V, ambient temperature ≤+70°C, and proper thermal layout. Peak inductor current reaches ~1.5A during transient events, and the device includes cycle-by-cycle current limiting to protect against overload. Derating applies above +70°C per the 5.88mW/°C thermal specification.
Does the MAX750ACSA+ require an external inductor, and what value should be used?
Yes, the MAX750ACSA+ requires an external inductor. It is fully characterized and guaranteed to operate with either a 33µH or 100µH inductor - no custom design needed. For MAX750AC variants like the MAX750ACSA+, 100µH is recommended for general-purpose use; 33µH may be selected for higher-frequency ripple suppression. Inductor saturation current must exceed 1A, and DCR should be <0.8Ω.
How does the soft-start function work on the MAX750ACSA+?
The MAX750ACSA+ implements programmable soft-start via an external capacitor on the SS pin. Charging this capacitor (e.g., 0.1µF) through an internal current source ramps the error amplifier clamp voltage, gradually increasing the current-limit threshold and preventing output overshoot or inrush current. A 510kΩ resistor from SS to SHDN adds current boost for loads >1A. Soft-start also initiates after undervoltage or overcurrent faults.
What protection features are built into the MAX750ACSA+?
The MAX750ACSA+ integrates undervoltage lockout (3.5V fall / 3.75V rise), cycle-by-cycle current limiting (~1.5A peak), thermal-safe shutdown, and soft-start-based short-circuit protection. It also features a dedicated shutdown pin (SHDN) that reduces supply current to 6µA and forces output to 0V. No external protection circuitry is required for basic safe operation across its rated input and load ranges.
Can the MAX750ACSA+ be used with a 3.3V output, and how is it configured?
Yes, the MAX750ACSA+ supports adjustable outputs from 1.25V to VIN. To configure 3.3V, connect a resistor divider between output and GND, with the midpoint feeding the CC pin. Using R3 = 10kΩ, calculate R2 ≈ 17.2kΩ (R2 = R3 × ((3.3V / 1.22V) − 1)). Output accuracy is ±4.5% plus resistor tolerances; include a 330pF compensation capacitor between CC and output for stability across line/load/temperature.
MAX750ACSA+ 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:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4V
- Voltage - Input (Max):
- 11V
- Voltage - Output (Min/Fixed):
- 1.22V
- Voltage - Output (Max):
- 11V
- 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
MAX750ACSA+ FAQ
1.How can I place an order for MAX750ACSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX750ACSA+ 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 MAX750ACSA+ reliable?
The price and inventory of MAX750ACSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX750ACSA+ is usually 5 days.
3.What payment methods are accepted for MAX750ACSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX750ACSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX750ACSA+?
MAX750ACSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX750ACSA+ 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 MAX750ACSA+?
For technical support, including MAX750ACSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX750ACSA+ requirements.
6.How does Aetrix verify that MAX750ACSA+ is sourced from the original manufacturer or authorized distributors?
All MAX750ACSA+ 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 MAX750ACSA+ meets industry standards.
7.What is the process for return or replacement of MAX750ACSA+?
All MAX750ACSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX750ACSA+, 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 MAX750ACSA+ part is unused and in its original packaging.
Return procedure for MAX750ACSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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