| Vin (Min) (V) | 4.5 |
| Vin (Max) (V) | 42 |
| Vout (Min) (V) | 0.9 |
| 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 | Catalog |
- 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 0.9V
- Precision ±2% Feedback Reference
- Capable of 100% Duty Cycle Operation
- Internal Soft-Start Timer
- Integrated High Voltage Bias Regulator
- Thermal Shutdown
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The LM25085A is a functional variant of the LM25085 COT PFET Buck Switching Controller. The functional differences of the LM25085A are: The feedback reference voltage is 0.9V, the forced off-time after current limit detection is longer, and the soft-start time is shorter (1.8 ms).
The LM25085A 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.
