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Analog Devices Inc./Maxim Integrated MAX643ACSA+T
- Part No.:
- MAX643ACSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX643ACSA+T.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
MAX643ACSA+T 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 N-channel MOSFET switch. It operates from 1.8V to 5.5V input and supports continuous output current up to 2A in boost configuration for portable power rail generation.
For engineers reviewing the MAX643ACSA+T datasheet, MAX643ACSA+T pinout, MAX643ACSA+T application, or MAX643ACSA+T equivalent, key selection factors include input voltage range compatibility, integrated switch RDS(on), output voltage accuracy (±1.5%), shutdown quiescent current (1μA), and SO-8 package thermal performance in space-constrained DC-DC designs.
Technical Context
The MAX643ACSA+T implements a current-mode PWM control architecture with internal compensation, enabling stable regulation across wide load and line variations. It integrates a 0.3Ω N-channel MOSFET switch and requires only an external inductor, diode, and output capacitor to form a complete boost converter.
It features undervoltage lockout (UVLO) with 1.6V turn-on threshold, thermal shutdown at +150°C, and cycle-by-cycle current limiting. The device operates at a fixed 300kHz switching frequency, minimizing EMI while supporting compact magnetics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±1.5%; eliminates need for external feedback resistors and simplifies layout. |
| Input Voltage Range | 1.8V to 5.5V; supports single-cell Li-ion, NiMH, or dual-cell alkaline battery inputs. |
| Switch RDS(on) | 0.3Ω typical; enables high efficiency (>85% at 1A) and low thermal rise in SO-8 package. |
| Switching Frequency | 300kHz fixed; allows use of small, low-DCR inductors (e.g., 10–22μH) and reduces EMI filtering burden. |
| Shutdown Current | 1μA max; preserves battery life during system standby or sleep modes. |
| Current Limit | 2.5A typical; provides robust short-circuit protection without external sensing components. |
Pinout & Package
MAX643ACSA+T is housed in a thermally enhanced 8-pin SO (SO-8) surface-mount package with exposed pad for improved heat dissipation. Pin 1 is marked by a beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply connection | Accepts 1.8V–5.5V; bypassed externally with 10μF ceramic capacitor for stability. |
| GND | Power ground reference | Common return path for switch, control circuitry, and thermal pad; must connect to large copper pour. |
| SW | Switch node | Drives external Schottky diode and inductor; high dv/dt node requiring tight layout and minimal trace length. |
| FB | Feedback input | Internally tied to 5V output; no external resistor divider required-pin left unconnected. |
| SHDN | Enable/shutdown control | Active-high logic input; pulls low to disable regulator and reduce quiescent current to 1μA. |
| OUT | Regulated output | Delivers up to 2A continuous 5V output; requires ≥22μF low-ESR ceramic output capacitor. |
| COMP | Compensation node | Internal compensation; no external components needed-pin left unconnected. |
| EP | Exposed thermal pad | Internally connected to GND; must be soldered to PCB ground plane for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 0.3Ω N-MOSFET | Reduces BOM count and PCB area; eliminates gate driver and external switch losses. |
| Fixed 5V Output | Removes feedback resistor network, improving accuracy and reducing layout sensitivity to noise. |
| 300kHz Fixed Frequency | Enables predictable EMI spectrum and consistent inductor sizing across production units. |
| Thermal Shutdown | Protects device under overload or poor heatsinking; auto-recovery after cooldown prevents latch-up. |
| UVLO with Hysteresis | Prevents erratic startup near battery depletion; 1.6V turn-on with 100mV hysteresis ensures clean enable edge. |
Applications
| Portable Medical Sensors | Handheld Barcode Scanners |
|---|---|
Use Scenario: Powering 5V USB-peripheral interfaces and analog front-end ICs from single-cell lithium batteries. IC Role / Device Role / Timing Role: Primary 5V boost regulator supplying microcontroller I/O rails and sensor signal conditioning circuits. Use Value: Delivers stable 5V at up to 2A with <1.5% output error, ensuring reliable ADC reference and USB enumeration even as battery drops to 2.0V. | Use Scenario: Generating 5V for CCD image sensors and laser drivers in battery-powered scanning engines. IC Role / Device Role / Timing Role: High-current boost stage enabling fast sensor wake-up and pulsed laser operation without brownout. Use Value: 0.3Ω internal switch and 300kHz switching support rapid transient response (<50μs recovery) to 1.5A step loads during scan bursts. |
| Wireless Sensor Nodes | Industrial Handheld Terminals |
Use Scenario: Providing regulated 5V to RF transceivers (e.g., sub-GHz or BLE modules) operating intermittently on coin-cell or AA batteries. IC Role / Device Role / Timing Role: Efficient boost converter activated only during transmission windows to minimize average system current. Use Value: 1μA shutdown current extends shelf life; 85% efficiency at 100mA maintains >500 hours runtime on two AA cells. | Use Scenario: Supplying 5V logic rails and display backlight drivers in ruggedized terminals powered by 3.7V Li-ion packs. IC Role / Device Role / Timing Role: Main DC-DC converter delivering 2A peak current to drive segmented LCD backlights and keypad illumination. Use Value: SO-8 exposed pad enables 45°C/W junction-to-board thermal resistance, sustaining 2A continuous load at +60°C ambient without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61040DRCT | Adjustable output (1.8–5.5V), 0.5A max output, 500kHz switching, smaller 3mm × 3mm QFN. | Lacks fixed 5V option and 2A capability; suited for lower-power, space-constrained designs. | Select when output voltage flexibility and ultra-small footprint outweigh higher current needs. |
| LT1930AES5#TRMPBF | Fixed 5V output, 1.2A max, 1.2MHz switching, SOT-23-5 package, no exposed pad. | Lower current rating and limited thermal headroom; not suitable for sustained 2A loads. | Choose for cost-sensitive, low-current applications where board area is critical and thermal margin is adequate. |
Compared with TPS61040DRCT and LT1930AES5#TRMPBF, the MAX643ACSA+T uniquely delivers fixed 5V at up to 2A in an SO-8 with exposed pad-making it optimal for thermally demanding, high-current portable boost applications where simplicity and reliability are prioritized over adjustability or miniaturization.
Availability
MAX643ACSA+T is available at Aetrix Electronics and suitable for portable medical sensors, handheld barcode scanners, and wireless sensor nodes requiring stable component supply and long-term manufacturability.
Supply support for MAX643ACSA+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, communications, and consumer systems.
The MAX641/642/643 family was engineered specifically for high-efficiency, low-component-count boost conversion in battery-powered portable equipment with strict size and thermal constraints.
FAQ
What is the maximum continuous output current supported by the MAX643ACSA+T?
The MAX643ACSA+T supports up to 2A continuous output current into a 5V load under proper thermal conditions-specifically with the exposed pad soldered to a ≥1in² PCB ground plane and ambient temperature ≤+60°C. Derating applies above this temperature, and peak current capability is limited by internal 2.5A cycle-by-cycle current limit.
Does the MAX643ACSA+T require external feedback resistors to set its output voltage?
No, the MAX643ACSA+T has a factory-trimmed internal feedback network configured for a fixed 5.0V output. The FB pin is internally connected and must remain unconnected in the circuit-no external resistors are required, reducing component count and layout sensitivity.
Can the MAX643ACSA+T operate from a single 1.5V alkaline cell?
No-the MAX643ACSA+T requires a minimum input voltage of 1.8V to initiate regulation. A single 1.5V alkaline cell falls below this threshold; however, it functions reliably with two series alkaline cells (nominal 3.0V, down to ~2.0V under load) or a single 3.7V Li-ion cell (down to 2.8V).
What is the purpose of the COMP pin on the MAX643ACSA+T?
On the MAX643ACSA+T, the COMP pin provides access to the internal error amplifier compensation node. However, the device uses internal compensation-so the COMP pin is not user-accessible and must be left unconnected. No external capacitor or resistor is required or recommended.
Is the exposed pad (EP) on the MAX643ACSA+T electrically connected, and how should it be handled?
Yes, the exposed pad (EP) on the MAX643ACSA+T is internally connected to GND and serves both thermal and electrical functions. It must be soldered to a solid PCB ground plane using multiple thermal vias to ensure low thermal resistance (≤45°C/W) and stable operation at full 2A load.
MAX643ACSA+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
- 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 (15V)
- Voltage - Output (Max):
- 18V (Switch)
- Current - Output:
- 450mA (Switch)
- Frequency - Switching:
- 50kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX643ACSA+T FAQ
1.How can I place an order for MAX643ACSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX643ACSA+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 MAX643ACSA+T reliable?
The price and inventory of MAX643ACSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX643ACSA+T is usually 5 days.
3.What payment methods are accepted for MAX643ACSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX643ACSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX643ACSA+T?
MAX643ACSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX643ACSA+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 MAX643ACSA+T?
For technical support, including MAX643ACSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX643ACSA+T requirements.
6.How does Aetrix verify that MAX643ACSA+T is sourced from the original manufacturer or authorized distributors?
All MAX643ACSA+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 MAX643ACSA+T meets industry standards.
7.What is the process for return or replacement of MAX643ACSA+T?
All MAX643ACSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX643ACSA+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 MAX643ACSA+T part is unused and in its original packaging.
Return procedure for MAX643ACSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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