DC-DC преобразователи интегральные LM25085AMME/NOPB

PFET контроллер , постоянное время включения, 4.5В до 42В, 1 выход, понижающий, 1МГц, VSSOP-8

The LM25085AMME/NOPB is a constant on-time non-synchronous PFET Buck Controller with 0.9V reference. It is a high efficiency PFET switching regulator controller that can be used to quickly and easily develop a small, efficient buck regulator for a wide range of applications. This high voltage controller contains a PFET gate driver and a high voltage bias regulator which operates over a wide 4.5 to 42V input range. The constant on-time regulation principle requires no loop compensation, simplifies circuit implementation and results in ultra-fast load transient response. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The PFET architecture allows 100% duty cycle operation for a low dropout voltage. Either the RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.

• Adjustable current limit using RDS(ON) or a current sense resistor
• No loop compensation required
• Ultra-fast transient response
• Nearly constant operating frequency with line and load variations
• 0.9V Adjustable output voltage
• Precision ±2% Feedback reference
• Internal soft-start timer
• Integrated high voltage bias regulator
• Thermal shutdown
• Green product and no Sb/Br

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