ISL97635A
Pinout
ISL97635A
(24 LD QFN)
TOP VIEW
SMBCLK
SMBDAT
FPWM
PWMO
GND
PWMI/EN
1
2
3
4
5
6
24
7
23
8
22
9
21
10
20
11
19
12
18
17
16
15
14
13
PGND
PGND
OVP
IIN0
IIN1
IIN2
Pin Descriptions (I = Input, O = Output, S = Supply)
PIN
1
2
3
NAME
SMBCLK
SMBDAT
FPWM
TYPE
I
I/O
I
DESCRIPTION
SMBus serial clock input
SMBus serial data input and output
Connect a capacitor between FPWM and GND to set the DPWM frequency. FPWM = 5.4μ/C FPWM
If SMBus PWM or DPST mode is used, connect C FPWM to GND to set the dimming frequency. Also,
connect C PWMO between V PWMO and GND pins for DPST operation. If DC-to-PWM mode is used,
connect C FPWM to set the dimming frequency and apply a 0.21V to 1.21V at V PWMO .
4
PWMO
I/O
PWMI buffered output. If one connects a capacitor between PWMO and GND, it forms a lowpass filter
with an internal 40k Ω 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
6
GND
PWMI/EN
S
I
Analog GND and LED power return
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
9
10
11
12
13
14
15
16
17, 18
19, 20
21
22
23
24
NC
IIN5
IIN4
RSET
IIN3
IIN2
IIN1
IIN0
OVP
PGND
LX
FAULT
COMP
VIN
VDC
-
I
I
I
I
I
I
I
I
S
I
O
O
S
S
No Connect. Can be floating or grounded
Input 5 to current source, FB, and monitoring
Input 4 to current source, FB, and monitoring
Resistor connection for setting LED current, (see Equation 1 for calculating the ILEDmax)
Input 3 to current source, FB, and monitoring
Input 2 to current source, FB, and monitoring
Input 1 to current source, FB, and monitoring
Input 0 to current source, FB, and monitoring
Overvoltage protection input
Power ground (LX Power return)
Input to boost switch
Fault disconnect switch
Boost compensation pin
Input voltage for the device and LED power
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
10
FN6564.2
December 22, 2008
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