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LT3003
TYPICAL PERFORMANCE CHARACTERISTICS
T A = 25°C unless otherwise noted.
V IN Quiescent Current vs I LED
V IN Shutdown Current vs V IN
35
30
25
16
14
12
SHDN = 0
10
20
8
15
10
5
6
4
2
0
50
100
150
200
250
300
350
0
3
8
13
18
23
28
33
38
I LED (mA)
3003 G07
PIN FUNCTIONS
LED1 (Pin 1): Controlled current input for a string of LEDs
with a cathode lead connected to the pin. Connect the ?rst
string of LEDs to this pin.
LED2 (Pin 2): Controlled current input for a string of LEDs
with a cathode lead connected to the pin. Connect the sec-
ond string of LEDs to this pin.
LED3 (Pin 3): Controlled current input for a string of LEDs
with a cathode lead connected to the pin. Connect the third
string of LEDs to this pin.
V MAX (Pin 4):
? Boost: Connect to V OUT
? Buck Mode: Connect to Input Supply
? Buck-Boost Mode: Connect to V OUT
V IN (Pin 5): Input Supply, Upper Rail. This pin must be
locally bypassed with a capacitor to ground. V IN powers
the internal control circuitry.
? Boost: Connect to Input Supply
? Buck Mode: Connect to Input Supply
? Buck-Boost Mode: Connect to V OUT
PWM (Pin 6): Input Pin for PWM Dimming Control. A
PWM signal above 0.5V (on threshold) turns the LT3003
V IN (V)
3003 G08
channels on. A PWM signal below 0.5V completely discon-
nects each LED string. If the application does not require
PWM dimming, then the PWM pin can be left either open
(an internal 10μA source current pulls PWM high) or it
can be connected to a supply between 0.5V to 15V.
OT1 (Pin 7): Overtemperature Output. OT1 pulls 100μA
from the pin when the junction temperature exceeds
125°C. The part has to cool down by 6°C for the ?ag to
reset; ideal for providing an overtemperature ?ag to the
system microprocessor.
OT2 (Pin 8): Overtemperature Output. OT2 Pulls 300μA
from the pin when the junction temperature exceeds
125°C. The part has to cool down by 6°C for the ?ag to
reset; ideal for connecting to the switching regulator g m
error ampli?er output to defeat switching.
SHDN (Pin 9): Micropower Shutdown Pin. Below 0.7V
shuts down the IC. Typically I VIN = 4μA for SHDN = 0V.
? Boost: Connect to System Shutdown Signal or V IN
? Buck Mode: Connect to System Shutdown Signal
or V IN
? Buck-Boost Mode: If PWM dimming, connect to PWM
(Pin 6); if no PWM dimming, connect to system shut-
down signal or V IN
3003fa
4
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