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LT3746
TIMING CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25°C. V IN = 24V, V CC = 3V to 5.5V, V EN/UVLO = 1.5V, V FB = 1.5V,
V ISP = V ISN = 5V, V LEDxx = 0.5V, R T = 105k, R ISET = 60.4k, C CAP = 0.47μF to V IN , C SCKO = C SDO = C LDO = 27pF to GND, unless
otherwise noted.
SYMBOL
f SCKI
f PWMCK
t WH-CKI
t WL-CKI
t WH-PWM
t WL-PWM
t WH-LDI
t SU-SDI
t HD-SDI
t SU-LDI
t HD-LDI
PARAMETER
Data Shift Clock Frequency
PWMCK Clock Frequency
SCKI Pulse Duration
PWMCK Pulse Duration
LDI Pulse Duration
SDI-SCKI Setup Time
SCKI-SDI Hold Time
SCKI-LDI Setup Time
LDI-SCKI Hold Time
CONDITIONS
SCKI = H (Figure 3)
SCKI = L (Figure 3)
PWMCK = H (Figure 4)
PWMCK = L (Figure 4)
LDI = H (Figure 3)
SDI – SCKI ↑ (Figure 3)
SCKI ↑ – SDI (Figure 3)
SCKI ↓ – LDI ↑ (Figure 3)
LDI ↓ – SCKI ↑ (Figure 3)
l
l
l
l
l
l
l
l
l
l
l
MIN
16
16
20
20
20
2
2
5
15
TYP
MAX
30
25
UNITS
MHz
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
t PD-SCK ↑
t PD-SCK ↓
?t PD-SCK
SCKI-SCKO Propagation Delay (Rising) SCKI ↑ – SCKO ↑ (Figure 3)
SCKI-SCKO Propagation Delay (Falling) SCKI ↓ – SCKO ↓ (Figure 3)
SCK Duty Cycle Change
?t PD-SCK = t PD-SCK ↑ – t PD-SCK ↓
l
l
27
30
–3
44
50
ns
ns
ns
t PD-SD
t PD-LD ↑
t PD-LD ↓
SCKO-SDO Propagation Delay
LDI-LDO Propagation Delay (Rising)
LDI-LDO Propagation Delay (Falling)
SCKO ↑ – SDO (Figure 3)
LDI ↑ – LDO ↑ (Figure 3)
LDI ↓ – LDO ↓ (Figure 3)
l
l
l
2.2
4.5
27
30
7
44
50
ns
ns
ns
?t PD-LD
t PD-PWM
t R-SO
t F-SO
LD Duty Cycle Change
PWMCK-LED Propagation Delay
SCKO/SDO/LDO Rise Time
SCKO/SDO/LDO Fall Time
?t PD-LD = t PD-LD ↑ – t PD-LD ↓
PWMCK ↑ – I LED (Figure 4)
C LOAD = 27pF, 10% to 90%
C LOAD = 27pF, 90% to 10%
–3
80
3
3
ns
ns
ns
ns
Table 1. Test Parameter Equations
I OUT(MAX)(0 ? 31) – I OUT(MIN)(0 ? 31)
2 ? I OUTavg(0 ? 31)
? 100
(1)
Δ I LEDD (%) =
I OUT(AVG)(0 ? 31) – I OUT(CAL)
I OUT(CAL)
? 100
(2)
I OUT(CAL) = 1000 ? ?
? 1.205V ?
? R ISET ? ?
(3)
? I LINE (% / V) =
I OUTn
VCC = 5.5V
I OUTn
– I OUTn
VCC = 3.0V
VCC = 3.0V
?
100
2.5V
(4)
? I LOAD (% / V) =
I OUTn
I OUTn VOUTn = 0.5V
VOUTn = 2.5V – I OUTn VOUTn = 0.5V
?
100
2.0V
(5)
For more information www.linear.com/3746
3746fa
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