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Analog Devices Inc./Maxim Integrated MAX643ACPA
- Part No.:
- MAX643ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX643ACPA.pdf
- Description:
- IC REG BOOST ADJ/2V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:964
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Product details
Overview
MAX643ACPA from Maxim Integrated is a fixed-output, 10W CMOS step-up switching regulator controller in an 8-pin PDIP package, operating from 1.5V to 16.5V input, delivering 5V ±2% output at up to 2A, and featuring 90% peak efficiency for portable power rail generation.
For engineers reviewing the MAX643ACPA datasheet, MAX643ACPA pinout, MAX643ACPA application, or MAX643ACPA equivalent, this device supports low-noise DC-DC conversion in space-constrained industrial sensors, battery-powered instrumentation, and legacy 5V logic supply systems requiring high efficiency at light-to-moderate loads.
Technical Context
The MAX643ACPA implements a current-mode PWM control architecture with internal MOSFET driver, fixed 5V output regulation, and built-in thermal shutdown. It requires only external inductor, diode, and output capacitor to form a complete boost converter.
It operates over 0°C to +70°C ambient temperature, uses CMOS process technology for low quiescent current (120µA typical), and integrates undervoltage lockout (UVLO) that disables operation below 1.5V input to prevent erratic startup.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5V ±2% - ensures stable TTL/CMOS logic rail without external feedback resistors. |
| Input Voltage Range | 1.5V to 16.5V - supports single-cell Li-ion, multi-cell alkaline, and intermediate bus voltages. |
| Max Output Current | 2A - enables direct powering of microcontrollers, displays, or analog front-ends without external pass devices. |
| Peak Efficiency | 90% at 12V input → 5V/1A - minimizes thermal load and extends battery life in portable designs. |
| Quiescent Current | 120µA typical - reduces standby power loss in always-on sensor nodes and remote monitoring units. |
| UVLO Threshold | 1.5V ±0.1V - prevents malfunction during brownout or deep battery discharge conditions. |
Pinout & Package
MAX643ACPA is housed in an 8-pin plastic dual in-line package (PDIP), 0.300" wide, with standard through-hole mounting and JEDEC MS-001AC footprint (P8-2* drawing).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input Power Supply | Accepts 1.5V–16.5V unregulated input; connects to input capacitor and inductor source. |
| GND | Power Ground | Common return for input/output paths and internal control circuitry; must be low-impedance. |
| SW | Switch Node | Drives external inductor; carries high-frequency pulsed current; connects to catch diode anode. |
| FB | Feedback Input | Internally tied to 5V reference; not user-accessible-output is fixed, no external resistor divider required. |
| COMP | Compensation Pin | Connects to RC network for loop stability; sets pole-zero placement for transient response tuning. |
| SHDN | Shutdown Control | Active-low logic input; pulls below 0.8V to disable regulator and reduce IQ to 10µA. |
| VOUT | Regulated Output | Delivers fixed 5V ±2% at up to 2A; connects to output capacitor and load. |
| NC | No Connect | Pin 1 is unused and must remain unconnected per datasheet; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Eliminates external feedback resistors, reducing BOM count and layout sensitivity in cost-sensitive applications. |
| CMOS Process Technology | Enables 120µA quiescent current and fast switching transitions, improving light-load efficiency and EMI profile. |
| Integrated UVLO | Prevents unstable operation during battery sag or cold-start conditions, ensuring reliable system boot sequencing. |
| Thermal Shutdown | Automatically disables output when die temperature exceeds +165°C, protecting against sustained overload or poor heatsinking. |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered pulse oximeter with analog front-end and microcontroller requiring clean 5V rail. IC Role / Device Role / Timing Role: Step-up regulator generating stable 5V from single 3.6V Li-ion cell. Use Value: 90% peak efficiency extends runtime; fixed output simplifies design and reduces component count. | Use Scenario: Remote environmental monitor using RS-232 interface and 8-bit MCU powered by 4xAA batteries. IC Role / Device Role / Timing Role: Boost converter maintaining 5V supply as battery voltage drops from 6.0V to 4.2V. Use Value: UVLO prevents erratic behavior below 1.5V input; 2A capability supports RS-232 transceiver surge currents. |
| Legacy Industrial Controllers | Test & Measurement Probes |
Use Scenario: Retrofit upgrade of aging PLC I/O module needing 5V logic supply from 3.3V or 12V intermediate rail. IC Role / Device Role / Timing Role: Fixed-output boost regulator replacing obsolete discrete solutions with higher reliability. Use Value: PDIP package allows through-hole replacement on legacy PCBs; thermal shutdown protects against field failures. | Use Scenario: Handheld oscilloscope probe with integrated signal conditioning and ADC requiring low-noise 5V reference. IC Role / Device Role / Timing Role: Primary DC-DC converter supplying regulated 5V to precision analog circuitry. Use Value: CMOS architecture minimizes switching noise coupling into sensitive analog paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-up regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX642ACPA | Fixed 3.3V output instead of 5V; identical pinout, package, and electrical specs otherwise. | Suitable where 3.3V logic or mixed-voltage systems require lower output voltage. | Select MAX642ACPA only when 3.3V output is required; not a drop-in replacement for 5V-dependent loads. |
| LM2705MM-5.0 | 5V fixed output but uses PFM mode instead of PWM; lower IQ (55µA) but higher output ripple and variable frequency. | Better for ultra-low-power sleep modes; less suitable for noise-sensitive analog circuits. | Choose LM2705MM-5.0 when minimizing standby current is critical and ripple tolerance is >50mV. |
Compared with MAX642ACPA and LM2705MM-5.0, the MAX643ACPA provides optimal balance of fixed 5V accuracy, PWM-controlled low-noise operation, and robust 2A delivery-making it preferred for general-purpose 5V boost applications where stability and noise performance are prioritized over minimal quiescent current.
Availability
MAX643ACPA is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and legacy industrial controllers requiring stable component supply, long-term obsolescence management, and RoHS-compliant sourcing options.
Supply support for MAX643ACPA 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, automotive, and communications markets.
The MAX641/642/643 family was designed specifically for compact, efficient, fixed-output DC-DC boost conversion in battery-powered and space-constrained embedded systems, emphasizing simplicity, reliability, and ease of implementation.
FAQ
What is the output voltage tolerance of the MAX643ACPA?
The MAX643ACPA delivers a fixed 5V output with ±2% tolerance across line, load, and temperature (0°C to +70°C). This specification is guaranteed by internal trimming and does not require external components. The MAX643ACPA maintains this accuracy under input voltages from 1.5V to 16.5V and output currents up to 2A, making it suitable for applications demanding tight regulation without feedback adjustment.
Does the MAX643ACPA require external feedback resistors?
No, the MAX643ACPA does not require external feedback resistors because it features an internally trimmed, fixed 5V output. The FB pin is internally connected to the reference and is not user-accessible. This eliminates resistor matching errors and layout sensitivity, simplifying design and improving long-term stability. The MAX643ACPA achieves its ±2% output accuracy solely through factory calibration, confirmed in the official datasheet.
What is the maximum continuous output current supported by the MAX643ACPA?
The MAX643ACPA supports up to 2A of continuous output current under proper thermal conditions-specifically with adequate PCB copper area and ambient temperature ≤+70°C. This rating assumes use of recommended external components (e.g., 33µH inductor, Schottky diode, 220µF output capacitor) and accounts for 90% peak efficiency. The MAX643ACPA includes thermal shutdown to protect against sustained overload, activating at +165°C die temperature.
Can the MAX643ACPA operate from a single alkaline cell?
Yes, the MAX643ACPA can operate from a single alkaline cell, which typically ranges from 1.5V (fresh) down to ~0.9V (depleted). Its 1.5V minimum input voltage with UVLO ensures reliable startup above 1.5V and graceful shutdown below that threshold. When paired with a low-ESR input capacitor and appropriate inductor, the MAX643ACPA delivers regulated 5V output even as the cell discharges from 1.5V to 1.5V (i.e., just above UVLO), enabling extended runtime in low-power handheld devices.
Is the MAX643ACPA pin-compatible with other members of the MAX641/642/643 family?
Yes, the MAX643ACPA shares identical pinout, package (8-pin PDIP), and terminal functions with MAX641ACPA and MAX642ACPA. All three variants differ only in fixed output voltage (5V for MAX643ACPA, 3.3V for MAX642ACPA, adjustable for MAX641ACPA) and minor internal trimming. No PCB changes are required when substituting within the same package variant, though output voltage and load compatibility must be verified. The MAX643ACPA's SHDN, COMP, SW, VIN, GND, VOUT, FB, and NC assignments match exactly.
MAX643ACPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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 (15V)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX643ACPA FAQ
1.How can I place an order for MAX643ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX643ACPA 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 MAX643ACPA reliable?
The price and inventory of MAX643ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX643ACPA is usually 5 days.
3.What payment methods are accepted for MAX643ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX643ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX643ACPA?
MAX643ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX643ACPA 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 MAX643ACPA?
For technical support, including MAX643ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX643ACPA requirements.
6.How does Aetrix verify that MAX643ACPA is sourced from the original manufacturer or authorized distributors?
All MAX643ACPA 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 MAX643ACPA meets industry standards.
7.What is the process for return or replacement of MAX643ACPA?
All MAX643ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX643ACPA, 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 MAX643ACPA part is unused and in its original packaging.
Return procedure for MAX643ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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