| 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 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
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 RDS(ON) of the PFET or an external sense resistor can be used to sense current for over-current detection.
