LT3498
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PACKAGE/ORDER INFORMATION
TOP VIEW
LED1 1
CTRL1 2
GND1 3
GND2 4
CTRL2 5
FB2 6
13
12 CAP1
11 SW1
10 V
IN
9 SW2
8 CAP2
7 V
OUT2
Input Voltage (V
IN
) ....................................................12V
CTRL1 and CTRL2 Voltage ........................................12V
FB2 Voltage ..............................................................2.5V
V
OUT2
Voltage ...........................................................32V
SW1 and SW2 Voltage ..............................................32V
CAP1 and CAP2 Voltage ............................................32V
LED1 Voltage ............................................................32V
Operating Junction Temperature Range ...–40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range...................–65°C to 150°C
DDB PACKAGE
12-LEAD (3mm
×
2mm) PLASTIC DFN
T
JMAX
= 125°C,
θ
JA
= 160°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER
LT3498EDDB
DDB PART MARKING
LCQF
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
PARAMETER
Minimum Operating Voltage
Maximum Operating Voltage
Supply Current (LED Off, OLED Off)
Supply Current (LED On, OLED Off)
Supply Current (LED Off, OLED On)
Supply Current (LED On, OLED On)
V
CTRL1
for Full LED Current
V
CTRL2
for Full OLED Brightness
V
CTRL1
or V
CTRL2
to Turn On I
C
V
CTRL1
and V
CTRL2
to Shut Down I
C
CTRL1, CTRL2 Pin Bias Current
LED Driver
LED Current Sense Voltage (V
CAP
– V
LED
)
CAP1, LED1 Pin Bias Current
V
CAP1
, V
LED1
Common Mode Minimum Voltage
Switching Frequency
Maximum Duty Cycle
Switch Current Limit
Switch V
CESAT
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C, V
IN
= 3V, V
CTRL1
= V
CTRL2
= 3V.
CONDITIONS
MIN
2.5
12
V
IN
= 3V, V
CTRL1
= 0V, V
CTRL2
= 0V
V
IN
= 3V, V
CTRL1
= 3V, V
CTRL2
= 0V, V
CAP1
= 24V,
V
LED1
= 23V
V
IN
= 3V, V
CTRL1
= 0V, V
CTRL2
= 3V, V
FB2
= 3V
V
IN
= 3V, V
CTRL1
= 3V, V
CTRL2
= 3V, V
CAP1
= 24V,
V
LED1
= 23V
●
TYP
MAX
UNITS
V
V
µA
mA
µA
mA
V
mV
8
1.6
230
1.65
1.5
125
10
2
280
2.05
●
●
75
100
mV
nA
V
CAP1
= 24V, I
SW
= 200mA
V
CAP1
= 16V, V
LED1
= 16V
●
190
200
20
210
30
2.5
2.8
mV
µA
V
MHz
%
mA
mV
3498f
●
1.8
88
300
2.3
90
425
250
●
I
SW
= 200mA
2
LINER [ LINEAR TECHNOLOGY ]
