SC1406GCTSTR datasheet(10/28 Pages) SEMTECH

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POWER MANAGEMENT

SC1406G

Evaluation Board Bill of Materials

Evaluation Board Gerber Plots

VOLTAGE CLAMP

This level translator converts an input voltage swing on the IO

rail, into a voltage swing on the CL or VCC rail depending on

where the open-drain output of the translator is tied to through

an external pull-up resistor. The level translator tracks the input

in phase, and switches in 5ns (typical) following an input

threshold intercept.

Applications Information

Power on/off Sequence

PowerStep Solution Design Procedure

Introduction:

The SC1406G (PowerStep for SpeedStep) and SC1405 Smart Driver power chip set provides a flexible, high performance

power solution to the requirements of Intel® mobile SpeedStep processors.

The SC1406G is a control IC that integrates a synchronous step-down controller for V

CORE and two low-dropout regulator (LDO)

controllers for V

I/O, and VCLK. In addition, the SC1406G also has a low-battery detector and a clamp circuit. The SC1405 is a

Smart Driver IC with programmable dead time and industry-leading speed.

The synchronous step-down converter is a hysteretic type, where the output voltage is compared against a VID programmable

reference (V

DAC) with a resistor programmable offset, VHYS. The basic operation of the converter is very simple: Referring to Figure 1,

with the voltage at the reference, Q

H is off, QL is on and the output filter (L and C) discharge into load R. When the output voltage

hits the lower hysteresis point, the switches reverse state, and the RLC network charges up to the upper hysteresis value.

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