The LM2633 is a feature-rich IC that combines three regulator controllers - two current mode synchronous buck regulator controllers and one linear regulator controller. Two switching regulator controllers operate in 180° stages. This feature reduces the rms input ripple current, resulting in a smaller input filter. The first switch controller (channel 1) employs an Intel mobile CPU compatible digital-to-analog converter with a 5-bit precision that outputs voltages from 0.925V to 2.00V. This also meets the requirements for dynamic VID compatibility. The second switch controller (channel 2) is adjustable from 1.25V to 6.0V. High efficiency over a wide load range is achieved at light loads using synchronous rectification and pulse skipping action. Fixed operating frequency can be disabled by disabling pulse skipping mode. Current mode feedback control guarantees excellent line and load regulation and a wide loop bandwidth for a good response to fast load transient events. Current mode control is via VDS on the top of the sense FET, so an external sense resistor is not necessary. A power good signal can be used to indicate a generally healthy output voltage. A unique feature of the switching controller that simulates soft-start is independent of the rate of change of the input voltage. This will allow for more predictable soft-start behavior controllable. An internal external 5V power supply is available for the bootstrap circuit (only) when there is no other source of 5V available. Adjustable value for both channel conversion or current limiting via induction top FET VDS and VDS. The two switching controllers have undervoltage and overvoltage lockout protection, and the linear regulator has undervoltage lockout protection. The undervoltage latch can be disabled or a programmable amount of time delay. Converting channels from an input voltage range of 5V to 30V makes it possible to select different battery chemistries and options.