0
ACTIVE
Rating |
Automotive |
Topology |
Buck Controller |
Iout (max) (A) |
10 |
Vin (max) (V) |
42 |
Vin (min) (V) |
4.5 |
Vout (max) (V) |
42 |
Vout (min) (V) |
1.25 |
Control mode |
Constant on-time (COT) |
Features |
Adjustable current limit, Frequency synchronization |
Duty cycle (max) (%) |
100 |
Iq (typ) (A) |
0.00125 |
Number of phases |
1 |
Operating temperature range (°C) |
-40 to 125 |
HVSSOP (DGN)-8-14.7 mm² 3 x 4.9
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.
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