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LT3003
APPLICATIONS INFORMATION
C1
V IN
L1
D1
C2
uses novel circuit techniques to reduce V EE and V MAX pin
currents to nano amp range ~10μs after PWM low edge.
This preserves the output capacitor voltage and results
R SENSE
in higher PWM dimming ratios.
+
D1A
D2A
D3A
Buck-Boost Mode: PWM Dimming
EA
DRV
SW
D1B
D1C
D2B
D2C
D3B
D3C
The LT3003 can also perform PWM dimming in buck-boost
mode. The buck-boost con?guration requires the PWM
and SHDN pins to be tied together. This con?guration can
LED DRIVER
LED1
LED2
LED3
V MAX
support up to a 2000:1 PWM dimming ratio.
PWM
PWM
LT3003
OT1
SHDN
V IN
V EE
GND
OT2
OT1 OT2 V IN V MAX
D3C
D3B
D3A
3003 F03
GND
LED3
LT3003
D2C
D2B
D2A
Figure 3. Boost Mode
V EE
LED2
D1C
D1B
D1A
R SENSE
LED1
C1
V IN
SHDN PWM
R SENSE
V IN
C1
L1
+
D1
C2
D1A
D1B
D1C
D2A
D2B
D2C
D3A
D3B
D3C
PWM
EA
DRV
SW
LED1
LED2
LED3
V IN
V MAX
LED DRIVER
3003 F05
PWM
LT3003
OT1
OT2
V EE
GND
SHDN
Figure 5. Buck-Boost Mode
Overtemperature Protection
PWM
L1
C2
D1
The LT3003 incorporates internal junction temperature
sensing and provides two open-collector outputs, OT1 and
+
EA
LED DRIVER
DRV
SW
3003 F04
OT2, which become active low when junction temperature
exceeds 125°C. The active OT1 output can sink 100μA of
current and can be connected to system microprocessor.
The active low OT2 output can sink 300μA of current and
can be connected to the switching regulator’s g m error
ampli?er output to defeat switching. The LT3003 has to
cool down by 6°C (119°C) for OT1 and OT2 outputs to
Figure 4. Buck Mode
reset (collector outputs high).
3003fa
8
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