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LT3591

3591f

BLOCK DIAGRAM

PIN FUNCTIONS

VIN (Pin 1): Input Supply Pin. Must be locally bypassed.

GND (Pin 2): Ground Pin. Should be tied directly to local

ground plane.

SW (Pin 4): Switch Pin. Minimize trace area at this pin to

minimize EMI. Connect the inductor at this pin.

CAP (Pin 5): Output of the Driver. This pin is connected

to the cathode of internal Schottky. Connect the output

capacitor to this pin and the sense resistor from this pin

to the LED pin.

LED (Pin 7): Connection Point for the Anode of the First

LED and the Sense Resistor. The LED current can be

programmed by :

LED

SENSE

200

CTRL (Pin 8): Dimming and Shutdown Pin. Connect this

pin below 50mV to disable the driver. As the pin voltage

is ramped from 0V to 1.5V, the LED current ramps from

0 to ILED ( = 200mV/RSENSE). The CTRL pin must not be

left ﬂoating.

Exposed Pad (Pin 9): Ground. The Exposed Pad must

be soldered to PCB ground to achieve the rated thermal

performance.

–

CAP

VIN

DRIVER

OVERVOLTAGE

PROTECTION

RAMP

GENERATOR

OSCILLATOR

VREF

1.25V

START-UP

CONTROL

SHDN

LED

3591 F01

CTRL

GND

–

A = 6.25

PWM

COMP

Figure 1. Block Diagram

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