LTC3454
2
3454fa
V
IN
, SW1, SW2, V
OUT
Voltage ......................–0.3V to 6V
V
C
, EN1, EN2, I
SET1
, I
SET2
Voltage .............................–0.3V to (V
IN
+ 0.3V) or 6V
LED Peak Current ...................................................1.25A
Storage Temperature Range ...................–65°C to 125°C
Operating Temperature Range (Note 2)....–40°C to 85°C
Junction Temperature (Note 3) ............................. 125°C
(Note 1)
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3454EDD#PBF LTC3454EDD#TRPBF LBQX
10-Lead (3mm × 3mm) Plastic DFN
–40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifi cations, go to:
http://www.linear.com/tapeandreel/
PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS
TOP VIEW
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
10
9
6
7
811
4
5
3
2
1
SW1
V
IN
V
C
V
OUT
SW2
EN1
EN2
I
SET1
I
SET2
LED
T
JMAX
= 125°C, θ
JA
= 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3.6V, R
ISET
= 20.5k unless otherwise noted. (Note 2)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Supply Voltage (V
IN
)
l
2.7 5.5 V
Input DC Supply Current
Normal Operation
Shutdown
UVLO
(Typicals at V
IN
= 3.6V, R
ISET1
= R
ISET2
= 20.5k)
2.7V ≤ V
IN
≤ 5.5V (Note 4)
2.7V ≤ V
IN
≤ 5.5V, V
EN1
= V
EN2
= 0V
V
IN
< UVLO Threshold, V
EN1
= V
EN2
= V
IN
l
825
0
5
1200
1
10
μA
μA
μA
Undervoltage Lockout Threshold V
IN
Rising
V
IN
Falling
l
1.75
2.05
1.90
2.3 V
V
V
EN1
, V
EN2
DC Threshold for Normal Operation (V
IH
)
l
0.68 1.2 V
V
EN1
, V
EN2
DC Threshold for Shutdown (V
IL
)
l
0.2 0.66 V
V
EN1
, V
EN2
Input Current
l
–1 1 μA
I
SET1
and I
SET2
Servo Voltage 3.08k ≤ R
ISET1
||R
ISET2
≤ 20.5k
l
780
788
800
800
812
812
mV
mV
LED Output Current to Programming Current Ratio I
LED
/(I
ISET1
+ I
ISET2
), I
LED
= 500mA (Note 5)
l
3725
3775
3850
3850
3975
3925
mA/mA
mA/mA
LED Pin Voltage I
LED
= 1A 105 mV
Regulated Maximum V
OUT
LED Pin Open, Programmed I
LED
= 1A
l
4.95 5.15 5.35 V
PMOS Switch R
ON
Switches A and D (V
OUT
= 3.6V) 170 mΩ
NMOS Switch R
ON
Switches B and C 130 mΩ
Forward Current Limit Switch A 2.5 3.4 A
Reverse Current Limit Switch D (V
OUT
= 3.6V) 275 mA
PMOS Switch Leakage Switches A, D –1 1 μA
NMOS Switch Leakage Switches B, C –1 1 μA
