The LM25085 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 4.5V 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 R_DS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.

• LM25085-Q1 is an Automotive Grade product that is AEC-Q100 Grade 1 Qualified (–40°C to 125°C Operating Junction Temperature)
• Wide 4.5V to 42V Input Voltage Range
• Adjustable Current Limit Using RDS(ON) or a Current Sense Resistor
• Programmable Switching Frequency to 1MHz
• No Loop Compensation Required
• Ultra-Fast Transient Response
• Nearly Constant Operating Frequency with Line and Load Variations
• Adjustable Output Voltage from 1.25V
• Precision ±2% Feedback Reference
• Capable of 100% Duty Cycle Operation
• Internal Soft-Start Timer
• Integrated High Voltage Bias Regulator
• Thermal Shutdown

• Vin (Min) (V)
• 4.5
• Vin (Max) (V)
• 42
• Vout (Min) (V)
• 1.25
• Vout (Max) (V)
• 42
• Iout (Max) (A)
• 10
• Iq (Typ) (uA)
• 1250
• Switching frequency (Min) (kHz)
• 50
• Switching frequency (Max) (kHz)
• 1000
• Features
• Adjustable Current Limit, Frequency Synchronization
• Regulated outputs (#)
• 1
• Number of phases
• 1
• Rating
• Automotive

LM25085-Q1的完整型号有：LM25085QMY/NOPB、LM25085QMYE/NOPB、LM25085QMYX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM25085QMY/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGN)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM25085QMY/NOPB的批量USD价格：.936（1000+）

LM25085QMYE/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGN)-8，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM25085QMYE/NOPB的批量USD价格：.936（1000+）

LM25085QMYX/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGN)-8，包装数量MPQ：3500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM25085QMYX/NOPB的批量USD价格：.8（1000+）

LM25085MYEVAL — 用于 LM25085 的评估板 - 42V 恒准时 PFET 降压开关控制器

The LM25085 evaluation board provides the design engineer with a fully functional buck regulator, employing the LM25085 PFET switching controller which uses the constant on-time (COT) operating principle. The evaluation board provides a 5V output over an input range of 5.5V to 42V. The circuit (...)

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