Datasheet LT3595 (Analog Devices) - 6

LT3595
PIN FUNCTIONS L1-16 (Pins 1, 3, 7, 9, 10, 12, 16, 18, 29, 31, 35, 37,
⎯
S
⎯
H
⎯
D
⎯
N (Pin 24):
Shutdown. Tie to 1.6V or greater to enable
38, 40, 44, 46):
LED Pins. Connection point for the anode the device. Tie below 0.4V to turn off the device. of the highest LED in each string.
NC (Pins 33, 42):
No Connect. Connect these pins to
SW1-16 (Pins 2, 4, 6, 8, 11, 13, 15, 17, 30, 32, 34,
ground.
36, 39, 41, 43, 45):
Switch Pins. Minimize trace area
R
at these pins to minimize EMI. Connect the inductors to
SET (Pin 51):
External Resistor to Set the Master LED Current. The LED current is equal to: these pins. 1.2 V 1
VIN (Pins 5, 14):
4.5V to 45V Input Supply Pin. ILED = • 1240 Must be locally bypassed. Both V R IN pins must be tied SET together. where RSET is the value of the external resistor. Use a
PWM1-16 (Pins 19-22, 25-28, 47-50, 53-56):
Input Pin kelvin for ground metal. for LED Dimming Function. The rising edge of each channel
VCC (Pin 52):
3.3V Input Supply. Must be locally by- must be synchronized. passed. ⎯
O
⎯
P
⎯
E
⎯
N
⎯
L
⎯
E
⎯
D (Pin 23):
Open Collector Output for Reporting
Exposed Pad (Pin 57):
Ground. The Exposed Pad must Faults. If any channel experiences an open LED connec- be soldered to PCB. Use wide metal from backtab to the tion, the ⎯O⎯P⎯E⎯N⎯L⎯E⎯D pin is pulled low. grounds of the input capacitors on VCC and VIN. 3595f 6