The LM25088MH-1/NOPB is a current mode non-synchronous Buck Controller features all the necessary functions to implement an efficient high voltage buck converter using a minimum number of external components. The LM25088 can be configured to operate over an ultra-wide input voltage range of 4.5 to 42V. This easy to use controller includes a level shifted gate driver capable of controlling an external N-channel buck switch. The control method is based upon peak current mode control utilizing an emulated current ramp. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage/low output voltage applications. This controller switching frequency is programmable from 50kHz to 1MHz. Additional features include a low dropout bias regulator, tri-level enable input to control shutdown and standby modes, soft-start and oscillator synchronization capability.
Emulated current mode control
Drives external high-side N-channel MOSFET
Low shutdown and standby modes
High duty cycle ratio feature for reduced dropout voltage
(EN)
