Datasheet LTC3860 (Analog Devices) - 9

LTC3860
PIN FUNCTIONS
A change in VIN immediately modulates the input to the
TRACK/SS1 (Pin 32), TRACK/SS2 (Pin 9):
Soft-Start. The PWM comparator and changes the pulse width in an in- voltage ramp rate at these pins sets the voltage ramp rate versely proportional manner, thus bypassing the feedback of the outputs. Self soft-start is accomplished by placing loop and providing excellent transient line regulation. An a capacitor to ground. external lowpass fi lter can be added to this pin to prevent noisy signals from affecting the loop gain.
FUNCTIONAL DIAGRAM
1 29 30 24 17 27 14 V SGND SGND RUN1 RUN2 PGOOD1 PGOOD2 VSNSOUT CC 4 VCC 100k VSNSP 6 1.5μA PGOOD V DA CC VSNSN 100k 5 1.5μA BG/BIAS VFB1 VFB2 VCC COMP1 3 SD/UVLO REF + TRACK/SS1 OC1 OC2 32 + EA1 + OV1 OV2 FB1 PWM1 2 – 25 PWMEN1 NOC1 26 REF + LOGIC PWM2 TRACK/SS2 NOC2 16 9 + EA2 + FB2 PWMEN2 8 – 15 COMP2 VFB1 7 ILIM1 MASTER/SLAVE/ VFB2 INDEPENDENT? ILIM2 RAMP/SLOPE/ VINSNS 31 FEEDFORWARD VCC S ISNS1P 20μA 22 + x18.5 ISNS1N 21 – OC1 VCC NOC1 20μA S ISNS2P 19 + VCC x18.5 21μA ISNS2N 20 – OC2 PLL/VCO NOC2 IAVG ILIM2 ILIM1 FREQ PHSMD CLKOUT CLKIN 28 18 23 10 13 12 11 3860 BD 3860fc 9 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS