LM2633

LM2633 www.ti.com SNVS139C – MAY 2004 – REVISED APRIL 2005 LM2633 Advanced Two-Phase Synchronous Triple Regulator Controller for Notebook CPUs Check for Samples: LM2633 FEATURES 1 23GENERAL Three regulated output voltages 4.5V to 30V input range Power good function Input under-voltage lockout Thermal shutdown Tiny TSSOP package SWITCHING SECTION Two channels operating 180° out of phase Separate on/off control for each channel Current mode control without sense resistor Skip-mode operation available Adjustable cycle-by-cycle current limit Negative current limit Analog soft start independent of input voltage slew rate Power ground pins separate Output UVP and OVP Programmable output UVP delay 250kHz switching frequency (for Vin < 17V) Channel 1 output from 0.925V to 2.00V ±1.5% DAC accuracy from 0°C to 125°C ±1.7% initial tolerance for Channel 2 Dynamic VID change ready Power good flags VID changes Channel 2 output from 1.3V to 6.0V LINEAR SECTION Output voltage adjustable 50mA maximum driving current Output UVP ±2% initial tolerance APPLICATIONS Power supply for CPUs of notebook PCs that require the SpeedStep™ technique Power supply for information appliances General low voltage DC/DC buck regulators DESCRIPTION The LM2633 is a feature-rich IC that combines three regulator controllers - two current mode synchronous buck regulator controllers and a linear regulator controller. The two switching regulator controll...