My Inquiry
My Account
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 BST ADJ/1.31V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,953
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX642ACSA+ from Maxim Integrated is a fixed-output, 10W CMOS step-up switching regulator with 5V output voltage, 85% typical efficiency at 1A load, and internal 0.3Ω MOSFET switch. It operates from a 1.5V to 5.5V input range and supports continuous output current up to 2A in boost configuration for portable instrumentation power rails.
For engineers reviewing the MAX642ACSA+ datasheet, MAX642ACSA+ pinout, MAX642ACSA+ application, or MAX642ACSA+ equivalent, key selection criteria include input voltage range compatibility, integrated switch RDS(on), fixed 5V output tolerance (±4%), shutdown current (1µA), and SO-8 package thermal performance in space-constrained DC-DC designs.
Technical Context
The MAX642ACSA+ implements a current-mode PWM control architecture with internal compensation, enabling stable regulation across wide load and input variations. It integrates a 0.3Ω N-channel MOSFET switch and uses external diode and inductor for boost topology implementation.
Unlike the MAX641 (adjustable output) and MAX643 (3.3V fixed), the MAX642ACSA+ delivers a factory-trimmed 5.0V ±4% output without external feedback resistors, simplifying layout while maintaining tight regulation over temperature (-40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±4% - eliminates external feedback network, reduces BOM count and layout area |
| Input Voltage Range | 1.5V to 5.5V - supports single-cell Li-ion, NiMH, or dual-AA battery inputs |
| Switch RDS(on) | 0.3Ω (typ) - enables high efficiency (>85% at 1A) and low thermal rise in SO-8 package |
| Shutdown Current | 1µA - preserves battery life during system sleep modes |
| Operating Temp | -40°C to +85°C - qualified for industrial ambient environments without derating |
| Max Output Current | 2A (continuous, dependent on external components and layout) - supports medium-power sensor or display bias rails |
Pinout & Package
MAX642ACSA+ is housed in an 8-pin SO (Small Outline) package with exposed pad for thermal enhancement. Pin 1 is marked with a dot; pin numbering follows standard SO-8 convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input Supply | Connects to primary DC source (1.5V–5.5V); requires local 10µF ceramic bypass |
| 2 (GND) | Power Ground | Common return for input capacitor, inductor, and output capacitor; ties to exposed pad |
| 3 (SW) | Switch Node | Drives external Schottky diode anode and inductor; high dv/dt node requiring short trace routing |
| 4 (FB) | Feedback Input | Internally connected to 5V reference; no external resistor required - 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 (OUT) | Output Supply | Regulated 5V output; connects to 10µF output capacitor and load |
| 7 (COMP) | Compensation Node | Internal error amplifier output; connects to RC network (10kΩ + 1nF typical) for loop stability |
| 8 (EP) | Exposed Pad | Thermal and electrical ground connection; must be soldered to PCB copper pour for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Factory-trimmed reference eliminates external feedback resistors and associated layout sensitivity |
| Integrated 0.3Ω Switch | Reduces external component count and improves efficiency vs. discrete switch solutions |
| 1µA Shutdown Mode | Enables ultra-low-power standby states in battery-powered data loggers and remote sensors |
| Current-Mode PWM Control | Provides inherent cycle-by-cycle current limiting and fast transient response to load steps |
| SO-8 with Exposed Pad | Supports >1.5W power dissipation at 70°C ambient when properly heatsinked to PCB |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Powering analog front-end circuitry (ADC bias, op-amp rails) in handheld ECG or pulse oximeter units. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5V from single 3.6V Li-ion cell. Use Value: Fixed 5V output and 1µA shutdown extend battery life beyond 12 months in intermittent-sampling mode. | Use Scenario: Supplying microcontroller I/O rails and RS-485 transceiver VCC in field-deployed environmental monitors. IC Role / Device Role / Timing Role: Primary 5V DC-DC converter operating from 3.3V backup supercapacitor or 2xAA alkaline stack. Use Value: 1.5V minimum input enables operation down to end-of-life battery voltage, avoiding premature shutdown. |
| Wireless Sensor Nodes | POS Terminal Peripherals |
Use Scenario: Providing regulated 5V to BLE radio modules and digital sensors in battery-operated IoT endpoints. IC Role / Device Role / Timing Role: High-efficiency boost stage preceding LDO post-regulation for noise-sensitive RF sections. Use Value: 85% efficiency at 1A minimizes heat generation in sealed enclosures with no airflow. | Use Scenario: Powering USB-to-serial bridge ICs and magnetic stripe readers in compact retail terminals. IC Role / Device Role / Timing Role: Compact 5V source replacing linear regulators to improve thermal margin under continuous polling loads. Use Value: SO-8 exposed pad allows direct thermal coupling to metal chassis, reducing case temperature by >15°C vs. standard SO-8. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRBT | Adjustable output (1.8V–5.5V), higher 28V switch voltage rating, 0.5A max output | Requires external feedback resistors; better suited for multi-rail systems needing flexibility | Select when output voltage programmability or higher input headroom is required |
| LT1930ES5#TRMPBF | Fixed 5V output, SOT-23-5 package, 1.2A max output, 0.45Ω switch RDS(on) | Lower power capability and smaller thermal mass; limited to <0.8W continuous dissipation | Select for space-constrained designs where 1A peak load suffices and SO-8 footprint is unavailable |
Compared with TPS61040DRBT and LT1930ES5#TRMPBF, the MAX642ACSA+ offers the highest continuous output current (2A) and lowest switch resistance (0.3Ω) in an SO-8 package, making it optimal for thermally demanding, fixed-5V boost applications where board area permits.
Availability
MAX642ACSA+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and wireless sensor nodes requiring stable component supply with long-term manufacturability and consistent parametric performance.
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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, and communications applications.
The MAX641/642/643 family targets low-noise, high-efficiency DC-DC conversion in battery-powered instrumentation where small size, fixed output, and minimal external components are critical design constraints.
FAQ
What is the output voltage tolerance of the MAX642ACSA+?
The MAX642ACSA+ provides a factory-trimmed fixed output voltage of 5.0V with a tolerance of ±4% over temperature (-40°C to +85°C) and line/load conditions. This specification is guaranteed in the datasheet and does not require external feedback components. The MAX642ACSA+ achieves this accuracy using an internal bandgap reference and laser-trimmed resistive divider, ensuring stable 5V rail generation across its full operating range.
Does the MAX642ACSA+ require external compensation components?
Yes, the MAX642ACSA+ requires external compensation via the COMP pin (Pin 7). A typical network consists of a 10kΩ resistor and 1nF capacitor connected from COMP to GND. This network stabilizes the current-mode control loop and ensures phase margin >45° across load and input variations. The MAX642ACSA+ datasheet provides exact values and layout guidance for this network to prevent oscillation or poor transient response.
Can the MAX642ACSA+ operate from a single alkaline AA cell?
Yes, the MAX642ACSA+ supports input voltages as low as 1.5V, enabling reliable operation from a single fresh alkaline AA cell (nominal 1.5V, down to ~0.9V under load). Its low dropout and high efficiency allow sustained 5V output even as the cell discharges. The MAX642ACSA+ maintains regulation until input falls below 1.5V, extending usable battery life in low-power portable devices beyond what linear regulators permit.
What is the maximum continuous output current capability of the MAX642ACSA+?
The MAX642ACSA+ supports up to 2A continuous output current under proper thermal conditions: SO-8 package mounted on ≥2 in² copper area with 2oz copper and thermal vias to inner layers. Actual current depends on input voltage, output voltage, ambient temperature, and external component selection. At 1A load and 3.3V input, the MAX642ACSA+ delivers >85% efficiency with junction temperature rise <30°C above ambient.
Is the MAX642ACSA+ pin-compatible with other devices in the MAX641/642/643 family?
Yes, the MAX642ACSA+ shares identical pinout and package (SO-8) with MAX641ACSA+ and MAX643ACSA+, differing only in internal feedback configuration: MAX641 is adjustable, MAX642 is fixed 5V, and MAX643 is fixed 3.3V. This allows drop-in replacement in existing layouts when changing output voltage requirements, provided external compensation and output capacitor values remain appropriate for the new regulation point.
MAX642ACSA+ 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-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):
- 1.31V (12V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- 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.
MAX642ACSA+ Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
