SC1406G Datasheet | SEMTECH

scription The SC1406G Power Step™ controller is a High Speed, High Performance Hysteretic Mode PWM controller. Teamed with the SC1405 Smart™ Driver, it powers advanced Pentium® II and Pentium® III processors. The SC1406G Features Intel Mobile Voltage Positioning (IMVP), which increases battery life by reducing the voltage at the processor when it is heavily loaded. It also directly supports Intel’s Speed Step™ processors for even longer battery life. A 5-bit DAC, accurate to 0.85%, sets the output voltage reference, and implements the 0.925V to 2.00V range of the mobile Pentium® specifications. The hysteretic converter uses a parator without an error amplifier, and therefore provides the fastest possible transient response, while avoiding the stability issues inherent to classical PWM controllers. Two linear regulator controllers, coupled with appropriate external transistors, produce tightly regulated 1.5V and 2.5V to plete the processor power solution. The SC1406G also Features separate soft-start controls for the converter and the regulators, a TTLpatible power good indication, logic enable, and low battery undervoltage lockout. Programmable current limiting uses a separate parator to protect against overloads and short-circuits. Features u High-speed hysteretic controller provides high effi u u u u ciency over a wide operating load range Inherently stable plete CPU power solution with two LDO drivers Programmable core voltage for Pentium® II & III pro cessors Native Speed Step® support Applications u Laptop and notebook puters u High performance microprocessor-based systems u High efficiency distributed power supplies Conceptual Application Circuit +V_5 +V_IN PWM Controller SC1405 SC1405 Smart Smart MOSFET MOSFET Driver Driver Lo +VCC_CPU_CORE +VCC_CPU_CORE Co 0.925V-2.0V Up to 14A IMVP IMVP CONTROLLER CONTROLLER SC1406G SC1406G 3.3V 1.5V 2.5A +VCC_CPU_IO +VCC_CPU_IO VID VID [4:0] [4:0] LDO Controller 3.3V 2.5V 150m A +VCC_CPU_CLK...