LTC3454 データシートの表示（PDF） - Linear Technology
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LTC3454 Datasheet PDF : 12 Pages
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LTC3454
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN, SW1, SW2, VOUT Voltage...................... –0.3V to 6V
VC, EN1, EN2, ISET1, ISET2
Voltage.............................–0.3V to (VIN + 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
PIN CONFIGURATION
TOP VIEW
EN1 1
EN2 2
ISET1 3
ISET2 4
LED 5
10 SW1
9 VIN
11
8 VC
7 VOUT
6 SW2
DD PACKAGE
10-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 40°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LTC3454EDD#PBF
LTC3454EDD#TRPBF LBQX
10-Lead (3mm × 3mm) Plastic DFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 85°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 3.6V, RISET = 20.5k unless otherwise noted. (Note 2)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Input Supply Voltage (VIN)
l 2.7
5.5
V
Input DC Supply Current
Normal Operation
Shutdown
UVLO
(Typicals at VIN = 3.6V, RISET1 = RISET2 = 20.5k)
l
2.7V ≤ VIN ≤ 5.5V (Note 4)
2.7V ≤ VIN ≤ 5.5V, VEN1 = VEN2 = 0V
VIN < UVLO Threshold, VEN1 = VEN2 = VIN
825 1200
μA
0
1
μA
5
10
μA
Undervoltage Lockout Threshold
VIN Rising
VIN Falling
l
2.05
2.3
V
1.75 1.90
V
VEN1, VEN2 DC Threshold for Normal Operation (VIH)
l
0.68
1.2
V
VEN1, VEN2 DC Threshold for Shutdown (VIL)
l 0.2
0.66
V
VEN1, VEN2 Input Current
l –1
1
μA
ISET1 and ISET2 Servo Voltage
3.08k ≤ RISET1||RISET2 ≤ 20.5k
l 780
800
812
mV
788
800
812
mV
LED Output Current to Programming Current Ratio ILED/(IISET1 + IISET2), ILED = 500mA (Note 5)
l 3725 3850 3975 mA/mA
3775 3850 3925 mA/mA
LED Pin Voltage
Regulated Maximum VOUT
PMOS Switch RON
NMOS Switch RON
Forward Current Limit
ILED = 1A
LED Pin Open, Programmed ILED = 1A
Switches A and D (VOUT = 3.6V)
Switches B and C
Switch A
105
mV
l 4.95 5.15 5.35
V
170
mΩ
130
mΩ
2.5
3.4
A
Reverse Current Limit
PMOS Switch Leakage
Switch D (VOUT = 3.6V)
Switches A, D
275
mA
–1
1
μA
NMOS Switch Leakage
Switches B, C
–1
1
μA
3454fa
2
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