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LT3478/LT3478-1
ABSOLUTE
(Note 1)
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
SW ............................................................................42V
TOP VIEW
V OUT , LED ..................................................................42V
V IN , V S , V L , ? S ? H ? D ? N (Note 5) .......................................36V
PWM .........................................................................15V
CTRL1, 2 .....................................................................6V
SS, R T , V C , V REF , OVPSET............................................2V
Operating Junction Temperature Range
(Notes 2, 3, 4).................................... –40°C to 125°C
SW
SW
V IN
V S
L
V OUT
LED
OVPSET
1
2
3
4
5
6
7
8
17
16 SS
15 R T
14 PWM
13 CTRL2
12 CTRL1
11 SHDN
10 V REF
9 V C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 Sec) .................. 300°C
FE PACKAGE
16-LEAD PLASTIC TSSOP
T JMAX = 125°C, θ JA = 35°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB.
ORDER PART NUMBER
LT3478EFE
LT3478EFE-1
LT3478IFE
LT3478IFE-1
FE PART MARKING
3478FE
3478FE-1
3478FE
3478FE-1
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts speci?ed with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. SW = open, V IN = V S = L = V OUT = ? S ? H ? D ? N = 2.7V, LED = open, SS = open,
PWM = CTRL1, CTRL2 = 1.25V, V REF = open, V C = open, R T = 31.6k.
PARAMETER
Minimum Operating Voltage
Operational Input Voltage
V IN Quiescent Current
V IN Shutdown Current
CONDITIONS
(Rising)
V S
V IN (Note 5)
V C = 0V (No Switching)
? S ? H ? D ? N = 0V
●
MIN
2.8
2.8
TYP
2.4
6.1
3
MAX
2.8
36
36
6
UNITS
V
V
V
mA
μA
? S ? H ? D ? N Pin Threshold (V SD_μp )
? S ? H ? D ? N Pin Threshold (V SD_UVLO )
? S ? H ? D ? N Pin Current
V REF Voltage
V REF Line Regulation
V REF Load Regulation
Frequency: f OSC 200kHz
Frequency: f OSC 1MHz
(Micropower)
(Switching)
? S ? H ? D ? N = V SD_UVLO – 50mV
? S ? H ? D ? N = V SD_UVLO + 50mV
I(V REF ) = 0μA, V C = 0V
I(V REF ) = 0μA, 2.7V < V IN < 36V
0 < I(V REF ) < 100μA (Max)
R T = 200k
R T = 31.6k
●
●
●
0.1
1.3
8
1.213
0.18
0.88
0.4
1.4
10
0
1.240
0.005
8
0.2
0.7
1.5
12
1.263
0.015
12
0.22
1.12
V
V
μA
μA
V
%/V
mV
MHz
MHz
34781f
2
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