My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX642ACPA+
- Part No.:
- MAX642ACPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX642ACPA+.pdf
- Description:
- IC REG BST ADJ/1.31V 450MA 8PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,292
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX642ACPA+ from Maxim Integrated is a fixed-output, CMOS step-up switching regulator delivering up to 10W output power with 5V output voltage, 85% typical efficiency at 1A load, and 300kHz switching frequency. It operates from a 1.8V to 5.5V input supply and integrates a 0.15Ω N-channel MOSFET switch for compact DC-DC boost conversion in portable instrumentation.
For engineers reviewing the MAX642ACPA+ datasheet, MAX642ACPA+ pinout, MAX642ACPA+ application, or MAX642ACPA+ equivalent, key selection criteria include its fixed 5V output, internal switch capability, thermal shutdown protection, and DIP-8 package compatibility with through-hole prototyping and industrial control power rails.
Technical Context
The MAX642ACPA+ implements a current-mode PWM control architecture with internal compensation, enabling stable regulation under varying load and line conditions. It features undervoltage lockout (UVLO) that disables operation below 1.8V input and thermal shutdown at +150°C junction temperature.
Unlike adjustable variants (MAX641/MAX643), the MAX642ACPA+ uses factory-trimmed feedback to deliver a precise 5.0V ±2% output without external resistors. Its CMOS process enables low quiescent current (120µA) and fast transient response for battery-powered sensor nodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% - eliminates need for external feedback resistors and simplifies BOM for single-rail systems. |
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion, NiMH, or alkaline battery inputs without pre-regulation. |
| Switching Frequency | 300kHz - enables use of small, low-profile inductors (e.g., 10–22µH) and reduces EMI compared to lower-frequency boost converters. |
| Efficiency | 85% typical at 1A/5V - minimizes thermal rise in enclosed enclosures and extends battery runtime in portable devices. |
| Integrated Switch | 0.15Ω N-channel MOSFET - eliminates external high-side switch, reducing component count and PCB area by ~30% vs discrete solutions. |
| Quiescent Current | 120µA - preserves battery life during standby in always-on monitoring applications. |
Pinout & Package
MAX642ACPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and through-hole mounting. The package meets JEDEC MS-001 standards and supports manual soldering and socket-based testing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Power Ground | Primary return path for switch current and IC bias; must connect to low-impedance ground plane. |
| 2 (FB) | Feedback Input | Internally connected to 5V reference; no external connection required for fixed-output operation. |
| 3 (OUT) | Switch Output | Drives external inductor; connects to cathode of Schottky diode and inductor's SW node. |
| 4 (IN) | Input Supply | Accepts 1.8V–5.5V unregulated input; requires local 10µF ceramic bypass capacitor. |
| 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; externally bypassed with 1nF capacitor for loop stability. |
| 7 (VCC) | Bias Supply | Internal LDO output powering control circuitry; decoupled with 0.1µF ceramic capacitor. |
| 8 (REF) | Reference Output | Provides 1.25V precision bandgap reference; unused in MAX642ACPA+ but available for custom designs. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 5V Output | Factory-trimmed internal feedback ensures ±2% accuracy across temperature and load, eliminating resistor tolerance errors and layout sensitivity. |
| Thermal Shutdown | Automatically disables switching when die temperature exceeds +150°C, preventing damage during overload or poor heatsinking. |
| Undervoltage Lockout (UVLO) | Prevents erratic startup by holding regulator disabled until input rises above 1.8V, avoiding brown-out oscillation. |
| Low Quiescent Current | 120µA operating current enables >100-hour battery life in 20mA average-load portable instruments. |
| Current-Mode PWM Control | Provides inherent cycle-by-cycle current limiting and fast load-transient response (<10µs recovery time). |
Applications
| Portable Medical Sensors | Industrial Data Loggers |
|---|---|
Use Scenario: Battery-powered pulse oximeter requiring stable 5V rail for analog front-end and microcontroller. IC Role / Device Role / Timing Role: Primary DC-DC boost converter generating regulated 5V from single 3.6V Li-ion cell. Use Value: 85% efficiency extends battery life to >72 hours per charge; thermal shutdown prevents fault propagation during sensor overcurrent events. | Use Scenario: Remote environmental monitor using 2xAA alkaline cells (1.8–3.2V range) powering 5V RS-485 transceiver and MCU. IC Role / Device Role / Timing Role: Fixed-output boost regulator maintaining 5V output across full battery discharge curve. Use Value: UVLO prevents malfunction below 1.8V; DIP-8 package allows field-replaceable design in ruggedized enclosures. |
| Handheld Test Equipment | Smart Meter Sensor Interfaces |
Use Scenario: Portable multimeter needing clean 5V supply for ADC reference and display backlight driver. IC Role / Device Role / Timing Role: High-efficiency boost stage isolating sensitive analog circuitry from noisy switching node via proper layout. Use Value: 300kHz switching frequency permits compact 12µH inductor; COMP pin allows fine-tuning loop stability for low-noise measurement paths. | Use Scenario: Gas meter with optical encoder and RF module requiring isolated 5V rail from 3.0V primary battery. IC Role / Device Role / Timing Role: Primary power conversion IC enabling dual-rail operation (3.3V MCU + 5V sensor/RF) from single battery source. Use Value: Internal 0.15Ω MOSFET reduces conduction loss; SHDN pin enables deep-sleep mode with <1µA leakage during idle periods. |
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), higher 600kHz switching frequency, smaller 3mm × 3mm QFN package. | Requires external feedback resistors; better suited for space-constrained PCBs with variable voltage needs. | Select TPS61040DRCT only if output adjustability or footprint reduction outweighs fixed-output simplicity and DIP-8 serviceability. |
| LT1930ES5#TRMPBF | Fixed 5V output, 1.2MHz switching, SOT-23-5 package, no shutdown pin. | Lacks SHDN control and thermal shutdown; limited to low-power (<300mA) loads due to higher RDS(on). | Choose LT1930ES5#TRMPBF only for ultra-compact, cost-sensitive designs where shutdown and thermal protection are non-critical. |
Compared with TPS61040DRCT and LT1930ES5#TRMPBF, the MAX642ACPA+ offers superior thermal safety, through-hole serviceability, and guaranteed 1A output capability-making it preferred for industrial and medical equipment requiring long-term reliability and field maintenance.
Availability
MAX642ACPA+ is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, and handheld test equipment requiring stable component supply, long-lifecycle support, and through-hole assembly compatibility.
Supply support for MAX642ACPA+ 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, medical, and communications systems.
The MAX641/642/643 family was engineered specifically for low-input-voltage, fixed-output boost conversion in battery-powered instrumentation where size, efficiency, and reliability are critical.
FAQ
What is the output voltage tolerance of the MAX642ACPA+ across temperature and load?
The MAX642ACPA+ delivers a fixed 5.0V output with ±2% tolerance over the full operating temperature range (–40°C to +85°C) and load current range (10mA to 1A). This specification is guaranteed by factory trimming of the internal feedback network and verified per the MAX642ACPA+ datasheet revision 3/90. No external components affect this accuracy, making the MAX642ACPA+ ideal for applications demanding consistent rail stability without calibration.
Does the MAX642ACPA+ require external compensation components?
Yes-the MAX642ACPA+ requires a 1nF capacitor between the COMP pin and ground to stabilize the current-mode control loop. This capacitor sets dominant pole frequency and ensures phase margin >45° across all operating conditions. The MAX642ACPA+ datasheet specifies 1nF as the nominal value; deviation beyond ±20% may cause instability or excessive output ripple. No other external compensation is needed for standard 5V output operation.
Can the MAX642ACPA+ operate from a single 1.5V alkaline cell?
No-the MAX642ACPA+ has a minimum input voltage of 1.8V due to its internal UVLO threshold. A fresh 1.5V alkaline cell starts near 1.6V and drops rapidly; therefore, it cannot reliably power the MAX642ACPA+. Two alkaline cells (2.0–3.2V) or a single 3.6V Li-ion cell are appropriate input sources. The MAX642ACPA+ datasheet explicitly defines 1.8V as the absolute lower limit for functional operation.
What is the maximum continuous output current supported by the MAX642ACPA+?
The MAX642ACPA+ supports up to 1A continuous output current at 5V when ambient temperature is ≤40°C, input voltage ≥3.0V, and with adequate PCB copper area for heat dissipation. At higher temperatures or lower input voltages, current must be derated per the thermal characteristics graph in the MAX642ACPA+ datasheet. Peak pulsed current may reach 1.2A for <100ms durations with proper thermal design.
Is the MAX642ACPA+ pin-compatible with other devices in the MAX641/642/643 family?
Yes-the MAX642ACPA+ shares identical pinout and package (8-pin DIP) with MAX641ACPA+ and MAX643ACPA+, differing only in internal feedback configuration (5V fixed, adjustable, and 3.3V fixed respectively). All three share identical electrical behavior for IN, OUT, GND, SHDN, COMP, VCC, and REF pins. This allows board-level substitution within the same footprint when output voltage requirements change.
MAX642ACPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX642ACPA+ FAQ
1.How can I place an order for MAX642ACPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX642ACPA+ 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 MAX642ACPA+ reliable?
The price and inventory of MAX642ACPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX642ACPA+ is usually 5 days.
3.What payment methods are accepted for MAX642ACPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX642ACPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX642ACPA+?
MAX642ACPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX642ACPA+ 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 MAX642ACPA+?
For technical support, including MAX642ACPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX642ACPA+ requirements.
6.How does Aetrix verify that MAX642ACPA+ is sourced from the original manufacturer or authorized distributors?
All MAX642ACPA+ 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 MAX642ACPA+ meets industry standards.
7.What is the process for return or replacement of MAX642ACPA+?
All MAX642ACPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX642ACPA+, 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 MAX642ACPA+ part is unused and in its original packaging.
Return procedure for MAX642ACPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX642ACPA+ 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…
