MIC2128
75V, Synchronous Buck Controller Featuring Adaptive
On-Time Control with External Soft Start
Features General Description Hyper Speed ControlВ® Architecture Enables:
-High Input to Output Voltage Conversion
Ratio Capability
-Any Capacitorв„ў Stable
-Ultra-Fast Load Transient Response Wide 4.5V to 75V Input Voltage Range Adjustable Output Voltage from 0.6V to 30V 270 kHz to 800 kHz Programmable Switching
Frequency Built-in 5V Regulator for Single-Supply Operation Auxiliary Bootstrap LDO for Improving System
Efficiency Internal Bootstrap Diode Adjustable Soft-Start Time Enable Input and Power Good Output Programmable Current Limit Hiccup Mode Short-Circuit Protection Internal Compensation and Thermal Shutdown Supports Safe Start-Up into a Prebiased Output The MIC2128 is a constant-frequency synchronous
buck controller featuring a unique adaptive on-time
control architecture with external soft start. The
MIC2128 operates over an input voltage range from
4.5V to 75V.The output voltage is adjustable down to
0.6V with a guaranteed accuracy of В±1%. The device
operates with programmable switching frequency from
270 kHz to 800 kHz.
The MIC2128 features an external soft-start pin (SS)
which allows the user to adjust output soft-start time to
reduce inrush current from mains during start-up. The
MIC2128 features an auxiliary bootstrap LDO which
improves the system efficiency by supplying the
MIC2128 internal circuit bias power and gate drivers …