LT1372IS8#TRPBF

Voltage - Output (Min/Fixed):	1.245V
Base Part Number:	LT1372
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz
Current - Output:	1.5A (Switch)
Voltage - Output (Max):	35V (Switch)
Series:	--
Voltage - Input (Max):	30V
Voltage - Input (Min):	2.7V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, Boost, Cuk, Flyback, Forward Converter, SEPIC
Output Configuration:	Positive or Negative
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT1372IS8#TRPBF Application Field and Working Principle

The LT1372IS8#TRPBF is a monolithic step-down DC/DC switching regulator designed for high efficiency, low noise and adjustable output voltages. It is a wide input voltage range buck regulator that combines the design of an advanced synchronous rectifier, extremely low on-resistance power MOSFETs and high switching frequencies to use the minimum components to produce the maximum power in an extremely small size. It is ideal for applications where high efficiency and reliability are required in tight spaces, such as portable batteries and small form factor computers.

Applications

The LT1372IS8#TRPBF is a great device for many applications that require high efficiency and reliability, such as:

• Portable battery chargers
• Notebook computers
• Measurement equipment
• Cell phones and hand held devices
• Portable medical instruments
• High frequency converters
• Industrial controls

Description

The LT1372IS8#TRPBF is a buck regulator with a wide input voltage range (2.5V to 32V). It has a low on-resistance, 10V logic-compatible gate drives and high switching frequencies to help reduce the size of the components and convert power efficiently. In addition, it has a wide range of adjustable output voltages up to 25V. The device also has thermal shutdown and overcurrent protection, as well as low ripple current in the output.

Features

• Wide Input Voltage Range (2.5V to 32V)
• High Efficiency Synchronous Rectification for Increased Efficiency
• Adjustable Output Voltage (up to 25V)
• Wide Range of Operating Temperatures (-40°C to +85°C)
• Thermal Shutdown Protection
• Overcurrent Protection
• Low Ripple Current in the Output

Working Principle

The LT1372IS8#TRPBF works by controlling the switching of two power MOSFETs, a high side and a low side. The switching is controlled by a voltage-mode pulse width modulator (PWM) which allows the frequency and duty cycle of the control voltages to be adjusted. The high side and low side MOSFETs are then alternately switched on and off. As the voltage output of the device increases, the duty cycle of the pulses is reduced to maintain a constant level of output voltage.The PWM converts the voltage into a duty cycle and the frequency of the PWM is controlled by a voltage controlled oscillator, which synchronizes the PWM to ensure the power MOSFETs are turned on and off in the required proportions. The current returning from the output is sensed and compared with the reference voltage set by the output voltage adjustment voltage. If an overcurrent is detected, the internal current limit circuit shuts down the PWM control and interrupts the power path.

Conclusion

The LT1372IS8#TRPBF is a great device for many applications that require high efficiency and reliability, such as portable battery chargers and notebooks computers. It features a wide input voltage range, adjustable output voltage, overcurrent protection and wide operating temperature range. The LT1372IS8#TRPBF has a switching architecture that incorporates an advanced synchronous rectifier and low-resistance power MOSFETs to produce a high level of power efficiency and reliability in an extremely small size.

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