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LT3593
PIN FUNCTIONS
(DFN/TSOT)
V IN (Pin 1/Pin 3): Input Supply Pin. Must be locally by-
passed with a 1μF X5R or X7R type ceramic capacitor.
GND (Pin 2/Pin 2): Ground Pin. Connect directly to local
ground plane.
SW (Pin 6/Pin 4): Switch Pin. Connect inductor between
this pin and the V IN pin. Minimize inductance at this pin
to minimize EMI.
CAP (Pin 5/Pin 5): Output Pin. Connect to output capaci-
tor. Minimize trace between this pin and output capacitor
to reduce EMI.
CTRL (Pin 3/Pin 1): Current Control and Shutdown Pin.
This pin is used to program the LED output current. This
pin is strobed up to 32 times to decrement the internal
5-bit DACs from full-scale to 1LSB. The counter will stop
at 1LSB if the strobing continues beyond 32 counts.
BLOCK DIAGRAM
1
The pin must be held high after the ?nal desired positive
strobe edge. The data is transferred after a 128μs (typ)
delay. The part can be reprogrammed to a different value
after it has been enabled, however the current will change
to the new value after 128μs. If CTRL is held low for longer
than 128μs (typ), the part will go into shutdown.
LED (Pin 4/Pin 6): LED Pin. An internal switch connects
this pin to CAP. The top of the LED string is connected
to this pin. When the part is in shutdown, the LED pin is
switched off from CAP so no current runs through the
LEDs. The switch is also used to sense the LED current
when the part is on.
Exposed Pad (Pin 7/NA): Ground. The Exposed Pad must
be soldered to the PCB.
6
V IN
PWM
COMP
DRIVER
SW
A2
R
S
Q
Q1
OVERVOLTAGE
PROTECTION
CAP
5
+
–
+
A3
R
RAMP
GENERATOR
–
M2
SHDN
M1
SHDN
V REF
1.24V
OSCILLATOR
5-BIT
A1
LINEAR DAC
LED
4
R C
C C
GND
5-BIT
COUNTER
CTRL
SHDN
7
2
3
3593 F01
PIN NUMBERS REFER TO DFN PACKAGE. REFER TO PIN CONFIGURATION FOR TSOT PIN NUMBERS
Figure 1. Block Diagram
3593f
6
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