The LM5088 high voltage 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 LM5088 can be configured to operate over an ultra-wide input voltage range of 4.5 V
to 75 V. 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. The LM5088 switching frequency is
programmable from 50 kHz to 1 MHz.
The LM5088 is available in two versions: The LM5088-1 provides a +/-5% frequency
dithering function to reduce the conducted and radiated EMI, while the LM5088-2 provides a
versatile restart timer for overload protection. Additional features include a low dropout bias
regulator, tri-level enable input to control shutdown and standby modes, soft-start and oscillator
synchronization capability. The device is available in a thermally enhanced HTSSOP-16 pin
package.
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