LT1241CN8#PBF

Frequency - Switching:	500kHz
Base Part Number:	LT1241
Supplier Device Package:	8-PDIP
Package / Case:	8-DIP (0.300", 7.62mm)
Operating Temperature:	0°C ~ 100°C (TJ)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	48%
Series:	--
Voltage - Supply (Vcc/Vdd):	8.2 V ~ 25 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive, Isolation Capable
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction to LT1241CN8#PBF

The LT1241CN8#PBF (LT1241) is a DC-DC switching controller that is specifically designed for use in Point-of-Load (POL) converters operating from 12V to 25V input and requiring up to 3A output current. It is the first switching controller specifically designed to work in the unique environment of Point-of-Load converters. The LT1241 utilizes an advanced dynamic control system to maintain high efficiency and superior transient response, while allowing the converter to maintain tight regulation limits over variations in load, line and temperature.

LT1241CN8#PBF Application Field and Working Principle

The LT1241CN8#PBF is designed for use in POL (Point-of-Load) DC-DC switching converters. It is ideal for powering intermediate bus architectures (IBAs), but is also useful for powering other types of loads such as CPUs, FPGAs and ASICs, which require output current up to 3A. Its advanced low-noise circulation control eliminates the need for inductors and other additional components which may increase system cost.The LT1241 provides a dynamic fixed-frequency PWM drive with a highly efficient current mode control scheme. This provides superior transient response and excellent dynamic control. Its unique approach to current mode control also minimizes cross-conduction and high-frequency EMI noise, adds flexibility, and reduces component count.The LT1241 integrates an under voltage lockout (UVLO) feature. Additionally, it includes two additional hysteresis settings, a fast dropout mode (SLEW¹/₁) to improve efficiency, and a low current mode that can be entered to reduce the output current in light load conditions (<75mV drop on the output voltage) and prevents erroneous oscillations.The LT1241 implements an adjustable current limit, allowing designers to maintain system stability when powering inductive loads. Additionally, it features a built-in synchronous rectifier gate driver. This eliminates the need for an external gate driver, simplifying the design and reducing component count.

Conclusion

The LT1241CN8#PBF is an advanced DC-DC switching controller specially designed for Point-of-Load (POL) converters operating from 12V to 25V input and requiring up to 3A output current. It integrates advanced dynamic control, UVLO, hysteresis, fast dropout mode and current limit, making it ideal for powering intermediate bus architectures (IBAs) or other types of loads such as CPUs, FPGAs and ASICs. Additionally, it includes a built-in synchronous rectifier gate driver, eliminating the need for an external gate driver, simplifying design and further reducing component count.

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