ISL68201

6

FN8696.1

March 7, 2016

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12

CSEN

This pin monitors the positive flow of output current with a series resistor and for overcurrent protection and telemetry. The

series resistor sets the current gain and should be within 40Ω

and 3.5kΩ.

13

NTC

Input pin for the temperature measurement. Connect this pin through an NTC thermistor (10kΩ,

 ~ 3380) and a decoupling

capacitor (~0.1μF) to GND and a resistor (1.54kΩ)

to VCC of the controller. The voltage at this pin is inversely proportional to

the VR temperature.

14

IOUT

Output current monitor pin. An external resistor sets the gain and an external capacitor provides the averaging function; an

external pull-up resistor to VCC is recommended to calibrate the no load offset. See “IOUT Calibration” on page 19

.

15

PROG4

Programming pin for Modulator (R4™) RR impedance and output slew rate during Soft-Start (SS) and Dynamic VID (DVID).

It also sets AV gain multiplier to 1x or 2x and determines the AV gain on PROG3.

16

PROG3

Programming pin for ultrasonic PFM operation, fault behavior, switching frequency and R4 (AV) control loop gain.

17

PROG2

18

PROG1

Programming pin for boot-up voltage.

19, 21

GND

Ground pin, connect directly to system ground plane.

20

FCCM

Output signal low to work with DrMOS ISL99140 for diode emulation in PFM mode; signal high for PWM mode.

22

PWM

PWM output and is compatible with 3.3V or 5V PWM input external driver, DrMOS or Smart Power Stage.

23

PVCC

Output of the 5V LDO and input for the LGATE and UGATE MOSFET driver circuits. Place a high quality low ESR ceramic

capacitors (4.7μF or higher, X7R) in close proximity to the pin.

24

LGIN

Low-side gate signal input to complete the internal FLL loop. A 100Ω series impedance from low-side gate drive signal to

this pin is recommended.

PAD

GND

Return of logic bias supply VCC. Connect directly to system ground plane with at least 4 vias.

PIN NUMBER

SYMBOL

DESCRIPTION