LT3753MPFE

Product Overview

• Category: Integrated Circuit (IC)
• Use: Power Management
• Characteristics: High voltage, high efficiency, compact size
• Package: 28-Lead Plastic TSSOP
• Essence: Power management controller for driving N-channel MOSFETs in isolated power supplies
• Packaging/Quantity: Tube/100 pieces

Specifications

• Input Voltage Range: 4.5V to 100V
• Output Voltage Range: 0.8V to 60V
• Switching Frequency: Up to 1MHz
• Operating Temperature Range: -40°C to 125°C
• Features: Adjustable soft-start, adjustable current limit, synchronization capability, fault protection

Detailed Pin Configuration

The LT3753MPFE has a total of 28 pins. The pin configuration is as follows:

1. VCC: Power supply input
2. GND: Ground reference
3. FB: Feedback pin for output voltage regulation
4. COMP: Compensation pin for loop stability
5. SS: Soft-start pin for adjustable startup time
6. SYNC: Synchronization pin for external clock input
7. RT/CLKOUT: Resistor timing or clock output pin
8. INTVCC: Internal power supply input
9. VREF: Reference voltage output
10. UVLO: Undervoltage lockout pin
11. SD: Shutdown pin for enabling/disabling the device
12. PGND: Power ground reference
13. SW1: Switch node connection for primary side MOSFET
14. SW2: Switch node connection for secondary side MOSFET
15. BOOT1: Bootstrap capacitor connection for primary side MOSFET
16. BOOT2: Bootstrap capacitor connection for secondary side MOSFET
17. VCC1: Power supply input for primary side
18. VCC2: Power supply input for secondary side
19. GND1: Ground reference for primary side
20. GND2: Ground reference for secondary side
21. VCC3: Power supply input for control circuitry
22. GND3: Ground reference for control circuitry
23. VCC4: Power supply input for gate drive
24. GND4: Ground reference for gate drive
25. SW3: Switch node connection for tertiary side MOSFET
26. BOOT3: Bootstrap capacitor connection for tertiary side MOSFET
27. VCC5: Power supply input for tertiary side
28. GND5: Ground reference for tertiary side

Functional Features

• High voltage operation allows for wide input voltage range
• Integrated power MOSFET gate drivers simplify design
• Adjustable soft-start feature enables controlled startup
• Adjustable current limit provides protection against overcurrent conditions
• Synchronization capability allows for external clock synchronization
• Fault protection features include undervoltage lockout and thermal shutdown

Advantages and Disadvantages

Advantages

• Wide input voltage range makes it suitable for various applications
• High efficiency results in reduced power consumption
• Compact size saves board space
• Integrated power MOSFET gate drivers simplify design and reduce component count

Disadvantages

• Limited output voltage range compared to some other power management controllers
• Higher cost compared to non-integrated solutions

Working Principles

The LT3753MPFE is a power management controller designed for driving N-channel MOSFETs in isolated power supplies. It operates by regulating the output voltage based on feedback received from the FB pin. The device incorporates various protection features such as undervoltage lockout and thermal shutdown to ensure safe operation. The adjustable soft-start and current limit features provide controlled startup and protection against overcurrent conditions.

Detailed Application Field Plans

The LT3753MPFE is commonly used in applications where high voltage, high efficiency, and compact size are required. Some of the typical application fields include:

1. Telecom and datacom systems
2. Industrial equipment
3. Automotive electronics
4. Renewable energy systems
5. Medical devices

Detailed and Complete Alternative Models

• LT3753M: Similar to LT3753MPFE but with a different package (16-Lead MSOP)
• LT3753H: High temperature version of LT3753MPFE (-40°C to 150°C operating temperature range)
• LT3753L: Low voltage version of LT3753MPFE (2.7V to 100V input voltage range)

These alternative models offer similar functionality but may have differences in package type, operating temperature range, or input voltage range.

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