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