LT3478 Datasheet, PDF (2/24 Pages) Linear Technology – 4.5A Monolithic LED Drivers with True Color PWM Dimming

LT3478/LT3478-1
ABSOLUTE AXI U RATI GS
(Note 1)
SW ............................................................................42V
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
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 Sec).................. 300°C
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
SW 1
SW 2
V_IN 3
V_S 4
L5
V_OUT 6
LED 7
OVPSET 8
16 SS
15 R_T
14 PWM
13 CTRL2
17
12 CTRL1
11 SHDN
10 V_REF
9 V_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 FE PART MARKING
LT3478EFE
LT3478EFE-1
LT3478IFE
LT3478IFE-1
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 specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications 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
CONDITIONS
MIN TYP MAX UNITS
Minimum Operating Voltage
(Rising)
●
2.4
2.8
V
Operational Input Voltage
V_IN Quiescent Current
V_IN Shutdown Current
⎯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_S
V_IN (Note 5)
V_C = 0V (No Switching)
⎯S⎯H⎯D⎯N = 0V
(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
2.8
36
V
2.8
36
V
6.1
mA
3
6
µA
● 0.1
0.4
0.7
V
1.3
1.4
1.5
V
8
10
12
µA
0
µA
● 1.213 1.240 1.263
V
V_REF Line Regulation
I(V_REF) = 0µA, 2.7V < V_IN < 36V
0.005 0.015
%/V
V_REF Load Regulation
Frequency: f_OSC 200kHz
Frequency: f_OSC 1MHz
0 < I(V_REF) < 100µA (Max)
R_T = 200k
R_T = 31.6k
8
12
mV
0.18
0.2
0.22
MHz
● 0.88
1.12
MHz
34781f
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