ISL97635A

FN6564 Rev.3.00

Page 4 of 29

Sep 26, 2017

PIN

NAME

TYPE

DESCRIPTION

1

SMBCLK

I

SMBus serial clock input

2

SMBDAT

I/O

SMBus serial data input and output

3

FPWM

I

4

PWMO

I/O

PWMI buffered output. If one connects a capacitor between PWMO and GND, it forms a lowpass filter with

an internal 40kΩ resistor to filter the PWMI signal for DPST operation when Reg 0x01 = 0x01. If one

applies a 0.2V to 1.2V DC input voltage, the output will be PWM with duty cycle proportional to the DC

input.

5

GND

S

Analog GND and LED power return

6

PWMI/EN

I

Dual Functions: Enable Pin and PWM brightness control pin or DPST control input. DO NOT let PWMI/EN

floating. The device needs 4ms for initial power-up Enable, then this pin can be applied with a PWM signal

with off time no longer than 28ms.

7, 8

NC

-

No Connect. Can be floating or grounded

9

IIN5

I

Input 5 to current source, FB, and monitoring

10

IIN4

I

Input 4 to current source, FB, and monitoring

11

RSET

I

Resistor connection for setting LED current, (see Equation 1 for calculating the ILEDmax)

12

IIN3

I

Input 3 to current source, FB, and monitoring

13

IIN2

I

Input 2 to current source, FB, and monitoring

14

IIN1

I

Input 1 to current source, FB, and monitoring

15

IIN0

I

Input 0 to current source, FB, and monitoring

16

OVP

I

Overvoltage protection input

17, 18

PGND

S

Power ground (LX Power return)

19, 20

LX

I

Input to boost switch

21

FAULT

O

Fault disconnect switch

22

COMP

O

Boost compensation pin

23

VIN

S

Input voltage for the device and LED power

24

VDC

S

De-couple capacitor for internally generated supply rail. If 2.7V < VBL+ < 5.5V, apply VDC directly with a

supply voltage of 2.7V to 5.5V