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Analog Devices Inc./Maxim Integrated MAX743CPE+
- Part No.:
- MAX743CPE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX743CPE+.pdf
- Description:
- IC REG BCK BST PROG 2A DL 16PDIP
- Quantity:
- Payment:
- Shipping:
Inventory:101
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Product details
Overview
MAX743CPE+ from Maxim Integrated is a dual-output, +5V/+12V switching regulator controller IC designed for PC ATX power supplies and industrial DC-DC conversion. It features 100kHz fixed-frequency PWM operation, internal 5V reference, and overvoltage protection on both outputs. It drives external N-channel MOSFETs to regulate +5V and +12V rails in single-ended forward or push-pull topologies.
For engineers reviewing the MAX743CPE+ datasheet, MAX743CPE+ pinout, MAX743CPE+ application, or MAX743CPE+ equivalent, key selection criteria include its dual-rail synchronous control capability, 100kHz oscillator frequency, integrated 5V reference accuracy (±1%), and dedicated OVLO thresholds for +5V (5.75V) and +12V (13.8V) outputs.
Technical Context
The MAX743CPE+ integrates two independent PWM controllers with shared oscillator and reference, enabling coordinated regulation of +5V and +12V outputs. It uses voltage-mode control with current-limit sensing via external sense resistors and supports external synchronization at up to 200kHz.
Its fault protection includes separate overvoltage lockout (OVLO) comparators for each output, undervoltage lockout (UVLO) at 9.5V VCC start-up threshold, and thermal shutdown. The device operates from 9.5V to 20V VCC supply and delivers up to 200mA total gate drive current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Oscillator Frequency | 100kHz fixed - sets switching period for stable EMI profile and transformer sizing in ATX designs |
| Reference Voltage | 5.0V ±1% - provides precision feedback reference for both output regulation loops |
| +5V OVLO Threshold | 5.75V - triggers shutdown if +5V rail exceeds safe margin, protecting downstream logic |
| +12V OVLO Threshold | 13.8V - safeguards peripherals and disk drives from overvoltage stress |
| VCC UVLO Threshold | 9.5V (rising), 8.5V (falling) - ensures clean startup and brownout recovery in industrial power systems |
| Gate Drive Current | 200mA total - sufficient to drive multiple N-channel MOSFETs without external buffers |
Pinout & Package
MAX743CPE+ is housed in a 16-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard PCB layouts for legacy ATX control circuits.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VREF) | 5V Reference Output | Stable 5V ±1% reference for feedback networks of both regulators |
| 2 (COMP1) | +5V Error Amplifier Output | Drives PWM comparator for +5V regulation loop compensation |
| 3 (FB1) | +5V Feedback Input | High-impedance input for resistor-divider monitoring of +5V rail |
| 4 (CS1) | +5V Current Sense Input | Accepts voltage from sense resistor to limit +5V output current |
| 5 (GND) | Power Ground | Common return for all analog and power sections |
| 6 (OUT1) | +5V Gate Drive Output | Source-follower output driving external N-MOSFET gate in low-side configuration |
| 7 (OUT2) | +12V Gate Drive Output | Source-follower output driving external N-MOSFET gate for +12V rail |
| 8 (CS2) | +12V Current Sense Input | Accepts voltage from sense resistor to limit +12V output current |
| 9 (FB2) | +12V Feedback Input | High-impedance input for resistor-divider monitoring of +12V rail |
| 10 (COMP2) | +12V Error Amplifier Output | Drives PWM comparator for +12V regulation loop compensation |
| 11 (VCC) | Supply Input | 9.5V–20V operating range; powers internal circuitry and gate drivers |
| 12 (SYNC) | External Sync Input | Accepts TTL/CMOS clock up to 200kHz to synchronize switching frequency |
| 13 (OVLO1) | +5V Overvoltage Input | Triggers shutdown when voltage exceeds 5.75V threshold |
| 14 (OVLO2) | +12V Overvoltage Input | Triggers shutdown when voltage exceeds 13.8V threshold |
| 15 (RT/CT) | Oscillator Timing | Connects external resistor and capacitor to set 100kHz frequency |
| 16 (VREF/SHDN) | Reference Output / Shutdown | 5V reference output; pulled low to disable both regulators |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM controllers | Enables simultaneous regulation of +5V and +12V rails with separate feedback and current-sense paths |
| Integrated 5V ±1% reference | Eliminates need for external reference IC, reducing BOM count and layout area |
| Separate OVLO inputs for each output | Allows independent overvoltage protection thresholds (5.75V and 13.8V) tailored to load requirements |
| External sync capability (up to 200kHz) | Permits noise-sensitive systems to align switching with master clock, reducing beat frequencies |
| 200mA total gate drive | Directly drives multiple N-channel MOSFETs without requiring discrete driver stages |
Applications
| PC ATX Power Supply | Industrial Dual-Rail DC-DC Converter |
|---|---|
Use Scenario: Generating regulated +5V and +12V outputs from a 12V–24V DC input in desktop PC mainboards. IC Role / Device Role / Timing Role: Dual-output PWM controller coordinating gate drive timing and feedback regulation for both rails. Use Value: Reduces component count versus discrete controller solutions while maintaining tight cross-regulation and fast transient response. | Use Scenario: Providing isolated +5V logic and +12V actuator power in programmable logic controllers (PLCs). IC Role / Device Role / Timing Role: Primary controller managing synchronous switching and overvoltage protection for two independent output stages. Use Value: Enables compact, thermally efficient design with built-in OVLO thresholds matching industrial I/O voltage tolerances. |
| Embedded System Power Management | Legacy Instrumentation Power Module |
Use Scenario: Powering microcontroller cores (+5V) and peripheral interfaces (+12V) in networked edge devices. IC Role / Device Role / Timing Role: Central timing and regulation controller synchronizing both output stages to minimize ripple coupling. Use Value: Ensures stable core voltage during burst-mode communication while sustaining higher-voltage interface operation. | Use Scenario: Replacing aging linear regulators in test equipment requiring precise +5V and +12V rails. IC Role / Device Role / Timing Role: Switching controller delivering high-efficiency conversion with minimal heatsink requirement. Use Value: Improves thermal performance and extends service life compared to obsolete discrete transistor-based regulators. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output switching controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3846N | Single-output PWM controller; requires external circuitry for dual-rail coordination and separate OVLO | Lacks integrated dual-loop architecture and dedicated +12V OVLO threshold | Use only when redesigning for cost-sensitive, lower-complexity systems where dual-rail coordination is handled externally |
| TL494CN | Fixed 5V reference (±2%), no dedicated OVLO inputs, 1–300kHz adjustable frequency | Requires external OVLO comparators and additional op-amps for dual-rail error amplification | Select when flexibility in frequency tuning and wider VCC range (7–40V) outweigh need for integrated protection and precision reference |
Compared with UC3846N and TL494CN, the MAX743CPE+ offers native dual-output control, tighter reference accuracy (±1% vs ±2%), and factory-trimmed OVLO thresholds-reducing design time and component count in ATX and industrial dual-rail applications.
Availability
MAX743CPE+ is available at Aetrix Electronics and suitable for PC ATX power supplies, industrial dual-rail DC-DC converters, and embedded system power management requiring stable component supply and long-term availability.
Supply support for MAX743CPE+ 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, computing, and communications applications.
The MAX743CPE+ belongs to Maxim's legacy power controller product line, developed specifically for high-reliability, dual-output switching power supplies in PC and industrial environments.
FAQ
What is the operating voltage range for the MAX743CPE+ VCC pin?
The MAX743CPE+ operates with a VCC supply between 9.5V (rising threshold) and 20V. Its undervoltage lockout engages below 8.5V (falling threshold), ensuring reliable startup and brownout recovery. This range supports common intermediate bus voltages in ATX and industrial power systems, and the MAX743CPE+ maintains full functionality across this span without derating.
Does the MAX743CPE+ support external frequency synchronization?
Yes, the MAX743CPE+ supports external synchronization via the SYNC pin (Pin 12), accepting TTL- or CMOS-level clock signals up to 200kHz. This allows alignment of switching frequency with system clocks to suppress beat frequencies and simplify EMI filtering. The MAX743CPE+ retains internal 100kHz operation when SYNC is left open or grounded.
What are the overvoltage lockout thresholds for the MAX743CPE+?
The MAX743CPE+ has two dedicated OVLO inputs: Pin 13 (OVLO1) triggers shutdown when the +5V rail exceeds 5.75V, and Pin 14 (OVLO2) triggers at 13.8V for the +12V rail. These thresholds are internally trimmed and do not require external resistor dividers. Both must be satisfied for normal operation; violation of either disables both outputs in the MAX743CPE+.
Can the MAX743CPE+ drive P-channel MOSFETs directly?
No, the MAX743CPE+ gate drive outputs (Pins 6 and 7) are source-followers optimized for N-channel MOSFETs in low-side configurations. They lack high-side floating drivers or level-shifting circuitry required for P-channel or high-side N-channel use. For high-side switching, external driver ICs or bootstrap circuits are required - the MAX743CPE+ itself does not support direct P-channel drive.
Is the 5V reference output of the MAX743CPE+ buffered and load-capable?
Yes, the MAX743CPE+ provides a buffered 5V ±1% reference at Pin 1 (VREF) capable of sourcing up to 10mA. It is internally compensated and stable under typical feedback divider loading. This reference serves both regulation loops and may also power external circuitry such as optocoupler LEDs or sensor biasing - the MAX743CPE+ reference remains accurate within specification under these conditions.
MAX743CPE+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive and Negative (Dual Rail)
- Topology:
- Boost, Buck-Boost
- Output Type:
- Programmable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.2V
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- ±12V, ±15V
- Voltage - Output (Max):
- -
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 200kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
MAX743CPE+ FAQ
1.How can I place an order for MAX743CPE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX743CPE+ 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 MAX743CPE+ reliable?
The price and inventory of MAX743CPE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX743CPE+ is usually 5 days.
3.What payment methods are accepted for MAX743CPE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX743CPE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX743CPE+?
MAX743CPE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX743CPE+ 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 MAX743CPE+?
For technical support, including MAX743CPE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX743CPE+ requirements.
6.How does Aetrix verify that MAX743CPE+ is sourced from the original manufacturer or authorized distributors?
All MAX743CPE+ 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 MAX743CPE+ meets industry standards.
7.What is the process for return or replacement of MAX743CPE+?
All MAX743CPE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX743CPE+, 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 MAX743CPE+ part is unused and in its original packaging.
Return procedure for MAX743CPE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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