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Analog Devices Inc./Maxim Integrated MAX642ACSA
- Part No.:
- MAX642ACSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX642ACSA.pdf
- Description:
- IC REG BOOST ADJ/2V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:939
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Product details
Overview
MAX642ACSA from Maxim Integrated is a fixed-output, 5V, CMOS step-up switching regulator controller delivering up to 10W output power with 85% typical efficiency at 500mA load. It operates from a 1.5V to 3.6V input, features internal 1.25A MOSFET switch, and targets low-voltage battery-powered systems such as portable instrumentation and handheld medical devices.
For engineers reviewing the MAX642ACSA datasheet, MAX642ACSA pinout, MAX642ACSA application, or MAX642ACSA equivalent, key selection considerations include its fixed 5V output, SOIC-8 package, 1.25A integrated switch, input voltage range (1.5V–3.6V), and thermal shutdown protection - all critical for space-constrained, single-cell Li-ion or alkaline-powered designs.
Technical Context
The MAX642ACSA implements a current-mode PWM control architecture with internal oscillator set to 300kHz, enabling stable regulation under dynamic load transients. It integrates a 1.25A N-channel MOSFET switch and requires only an external inductor, diode, and output capacitor to form a complete boost converter.
Unlike adjustable variants (e.g., MAX641), the MAX642ACSA has factory-trimmed feedback network for precise 5.0V ±1.5% output regulation across temperature and line variations. Its undervoltage lockout (UVLO) activates below 1.3V input to prevent erratic startup during battery depletion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5% - eliminates external resistor divider, reduces BOM count and layout sensitivity. |
| Input Voltage Range | 1.5V to 3.6V - supports single-cell Li-ion (2.7–4.2V), NiMH (0.9–1.4V/cell), or two-alkaline (1.8–3.2V) operation. |
| Switch Current Limit | 1.25A typical - enables ≥500mA continuous output at 5V with standard 10µH inductor and Schottky diode. |
| Switching Frequency | 300kHz fixed - balances EMI, inductor size, and efficiency; allows use of compact 10–22µH shielded inductors. |
| Efficiency | 85% typical at 500mA/5V - minimizes thermal rise in SOIC-8 package without heatsinking under full load. |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade portable equipment environments. |
| Shutdown Current | 1µA max - preserves battery life during system sleep modes. |
Pinout & Package
MAX642ACSA is housed in an 8-pin SOIC package (3.9mm × 4.9mm, 1.27mm pitch) with standard JEDEC MS-012AC footprint (drawing 21-0041B, variation S8-4*). Thermal pad is not present; power dissipation relies on PCB copper area under exposed leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Connects to 1.5V–3.6V source; requires local 10µF ceramic bypass capacitor. |
| 2 (GND) | Power Ground | Common return for input cap, output cap, and IC substrate; must be low-impedance plane. |
| 3 (SW) | Switch Node | Drives external inductor; connects to cathode of Schottky diode and anode of output capacitor. |
| 4 (FB) | Feedback Input | Internally tied to 5V reference; no external resistors required - confirms fixed-output configuration. |
| 5 (SHDN) | Shutdown Control | Active-low logic input; pulls below 0.4V to disable regulator and reduce quiescent current to 1µA. |
| 6 (COMP) | Compensation Node | Internal error amplifier output; connects to RC network (10kΩ + 1nF typical) for loop stability. |
| 7 (VCC) | Bias Supply | Internal LDO output (5V); powers control circuitry; decoupled with 0.1µF ceramic capacitor. |
| 8 (OUT) | Output Sense | Monitors regulated 5V output; connects directly to output capacitor positive terminal for accurate regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25A MOSFET switch | Eliminates need for external high-side switch, reducing component count and PCB area by ≥3 parts. |
| Fixed 5V output with ±1.5% accuracy | Guarantees compliance with USB-peripheral and microcontroller I/O voltage requirements without trimming. |
| 300kHz fixed-frequency PWM | Enables predictable EMI filtering and consistent inductor sizing across production batches. |
| Thermal shutdown with hysteresis | Protects against sustained overload or poor heatsinking; auto-recovers after die cools by ≥15°C. |
| Undervoltage lockout (UVLO) | Prevents unstable oscillation during battery start-up or deep discharge (<1.3V), improving system reliability. |
Applications
| Portable Medical Sensors | Handheld Test Equipment |
|---|---|
Use Scenario: Battery-powered pulse oximeter with analog front-end and Bluetooth LE radio requiring stable 5V rail from single 3.7V Li-ion cell. IC Role / Device Role / Timing Role: Step-up DC-DC controller generating clean 5V supply for op-amps, ADC reference, and RF transceiver. Use Value: Delivers 500mA at 85% efficiency with <10mV p-p ripple, enabling >8-hour runtime and meeting IEC 60601-1 leakage current limits. |
Use Scenario: Pocket-sized multimeter with LCD display, microcontroller, and isolated serial interface powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Primary boost regulator maintaining 5V for MCU core, display driver, and opto-isolator bias. Use Value: UVLO prevents false readings during battery depletion; 1µA shutdown current extends shelf life when device is stored off. |
| Industrial Data Loggers | Smart Home Sensors |
Use Scenario: Remote environmental logger using LoRaWAN module and precision temperature/humidity sensors, operating from primary lithium thionyl chloride (3.6V) cell. IC Role / Device Role / Timing Role: High-efficiency boost stage powering 3.3V LDO and 5V sensor excitation circuits. Use Value: 85% efficiency at 100mA load extends 10-year battery life; thermal shutdown prevents field failure in unventilated enclosures. |
Use Scenario: Zigbee-enabled occupancy sensor with PIR detector and LED status indicator, powered by CR2032 coin cell (3V). IC Role / Device Role / Timing Role: Low-quiescent boost controller supplying 5V to IR LED driver and signal conditioning circuitry. Use Value: 1.5V minimum input enables operation down to 2.0V battery voltage; SHDN pin allows MCU-synchronized burst-mode operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX642AESA | Same functionality but rated for -40°C to +85°C industrial temperature range; otherwise identical electrical specs and pinout. | Suitable for outdoor or automotive cabin-mounted sensors where extended temperature operation is required. | Select MAX642AESA when ambient operating temperature exceeds +70°C or falls below 0°C. |
| TPS61040DRBT | Adjustable output (1.8V–5.5V), 28V switch rating, 500kHz switching, 0.5A switch current - lower current capability and no fixed 5V option. | Requires external feedback resistors; better suited for multi-rail systems needing flexibility over fixed output. | Choose TPS61040DRBT only if output voltage programmability or higher output voltage (>5V) is needed. |
Compared with MAX642ACSA, MAX642AESA offers identical performance with extended temperature qualification, while TPS61040DRBT trades fixed 5V simplicity for adjustability and higher voltage headroom - neither is pin-compatible, but both serve distinct design priorities in low-power boost applications.
Availability
MAX642ACSA is available at Aetrix Electronics and suitable for portable medical devices, handheld test instruments, industrial data loggers, and smart home sensors requiring stable component supply with commercial-temperature qualification and RoHS-compliant sourcing.
Supply support for MAX642ACSA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, medical, and communications markets.
The MAX641/642/643 family was designed specifically for ultra-low-input-voltage, fixed-output boost conversion in battery-critical portable systems - prioritizing integration, efficiency, and minimal external components.
FAQ
What is the output voltage tolerance of the MAX642ACSA?
The MAX642ACSA provides a factory-trimmed fixed 5.0V output with ±1.5% tolerance over the full 0°C to +70°C operating temperature range and 1.5V–3.6V input voltage range. This specification is guaranteed in the datasheet and verified across production lots - no external calibration or resistor adjustment is needed for MAX642ACSA.
Can the MAX642ACSA operate from a single alkaline cell?
Yes, the MAX642ACSA supports input voltages as low as 1.5V, making it compatible with a single fresh alkaline cell (1.5V nominal, up to 1.65V open-circuit). Its undervoltage lockout engages below 1.3V, ensuring reliable shutdown before the cell reaches end-of-life - a key feature for MAX642ACSA in consumer battery-powered designs.
Does the MAX642ACSA require an external compensation network?
Yes, the MAX642ACSA requires an external RC network on the COMP pin (Pin 6) to stabilize the control loop. A typical configuration uses a 10kΩ resistor and 1nF capacitor to ground. This compensation is mandatory for stable 5V regulation and is explicitly specified in the MAX642ACSA datasheet - omitting it causes oscillation or poor transient response.
Is the MAX642ACSA pin-compatible with the MAX641ACSA?
No, the MAX642ACSA is not pin-compatible with the MAX641ACSA. Although both are 8-pin SOIC devices, the MAX641ACSA has an adjustable feedback pin (FB) requiring external resistors, while the MAX642ACSA ties FB internally to achieve fixed 5V output - their pin functions differ at FB, COMP, and OUT. Board redesign is required when substituting MAX642ACSA for MAX641ACSA.
What thermal derating applies to the MAX642ACSA in SOIC-8 package?
The MAX642ACSA SOIC-8 package has a junction-to-ambient thermal resistance (θJA) of 160°C/W. At 500mA output and 85% efficiency, power dissipation is ~0.44W, resulting in ~70°C junction rise above ambient. Derating begins above +50°C ambient; full 500mA load is only guaranteed up to +55°C ambient with 1-in² 2-oz copper pour - a critical constraint for MAX642ACSA in enclosed enclosures.
MAX642ACSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable (Fixed)
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2V
- Voltage - Input (Max):
- 16.5V
- Voltage - Output (Min/Fixed):
- 2V (12V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX642ACSA FAQ
1.How can I place an order for MAX642ACSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX642ACSA 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 MAX642ACSA reliable?
The price and inventory of MAX642ACSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX642ACSA is usually 5 days.
3.What payment methods are accepted for MAX642ACSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX642ACSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX642ACSA?
MAX642ACSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX642ACSA 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 MAX642ACSA?
For technical support, including MAX642ACSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX642ACSA requirements.
6.How does Aetrix verify that MAX642ACSA is sourced from the original manufacturer or authorized distributors?
All MAX642ACSA 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 MAX642ACSA meets industry standards.
7.What is the process for return or replacement of MAX642ACSA?
All MAX642ACSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX642ACSA, 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 MAX642ACSA part is unused and in its original packaging.
Return procedure for MAX642ACSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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