LM3644TTYFFR

Product Overview

Category

The LM3644TTYFFR belongs to the category of LED drivers.

Use

It is used for controlling and driving LED backlighting in LCD displays, particularly in applications such as smartphones, tablets, and other portable electronic devices.

Characteristics

• High efficiency
• Wide input voltage range
• Integrated boost converter
• Programmable LED current
• Dimming control
• Overvoltage protection
• Thermal shutdown protection

Package

The LM3644TTYFFR comes in a small outline, 20-pin, 3.5mm x 3.5mm, thermally enhanced, very thin fine pitch leadless package (VQFN).

Essence

The essence of LM3644TTYFFR lies in its ability to efficiently drive and control LED backlighting in portable electronic devices with high precision and reliability.

Packaging/Quantity

The LM3644TTYFFR is typically available in tape and reel packaging with a quantity of 2500 units per reel.

Specifications

• Input Voltage Range: 2.7V to 5.5V
• Output Voltage Range: Up to 40V
• LED Current Range: Up to 30mA
• Operating Temperature Range: -40°C to 85°C
• Efficiency: Up to 90%

Detailed Pin Configuration

1. VIN: Input voltage
2. SW: Switch node for boost converter
3. GND: Ground
4. FB: Feedback pin
5. EN: Enable pin
6. PWM: Pulse-width modulation dimming control
7. ISET: LED current set pin
8. VOUT: Output voltage
9. AGND: Analog ground
10. PGND: Power ground
11. BST: Boost converter output
12. LX: Inductor connection for boost converter
13. COMP: Compensation pin
14. SS/TRK: Soft-start/tracking pin
15. OVP: Overvoltage protection
16. TSD: Thermal shutdown
17. FAULT: Fault indication
18. NC: No connect
19. NC: No connect
20. NC: No connect

Functional Features

• Integrated boost converter for driving LED backlighting
• Programmable LED current for brightness control
• Dimming control through pulse-width modulation (PWM)
• Overvoltage protection and thermal shutdown for added safety
• Small form factor and high efficiency for portable device applications

Advantages and Disadvantages

Advantages

• High efficiency and wide input voltage range
• Precise LED current control for optimal brightness
• Integrated protection features for enhanced reliability
• Compact package suitable for portable electronic devices

Disadvantages

• Limited to driving LED backlighting and not suitable for general lighting applications
• Requires careful PCB layout and thermal management due to high efficiency and small package size

Working Principles

The LM3644TTYFFR operates by converting the input voltage to a higher output voltage using an integrated boost converter. The LED current is then programmatically controlled to achieve the desired brightness. Dimming control is achieved through pulse-width modulation, and the device incorporates protection features such as overvoltage and thermal shutdown to ensure safe operation.

Detailed Application Field Plans

The LM3644TTYFFR is ideally suited for use in various portable electronic devices requiring LED backlighting, including: - Smartphones - Tablets - Portable gaming devices - Handheld GPS devices - Portable media players

Detailed and Complete Alternative Models

Some alternative models to the LM3644TTYFFR include: - LT3496: LED driver with similar features and performance - TPS61165: Boost converter with integrated LED driver functionality - MP3302: LED driver with adjustable LED current and dimming control

In conclusion, the LM3644TTYFFR is a highly efficient and versatile LED driver designed for driving LED backlighting in portable electronic devices. Its compact package, precise control features, and integrated protection make it an ideal choice for applications requiring reliable and energy-efficient LED backlighting.

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