LT3669 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LT3669 Datasheet PDF : 40 Pages
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LT3669/LT3669-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C, VL+ = 24V. (Note 4)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
BST Pin Current
SYNC Threshold Voltage
ISW = –100mA (LT3669)
ISW = –300mA (LT3669-2)
5.25
7.5
mA
10.5
15
mA
0.5
0.9
1.5
V
SYNC Input Frequency
0.3
2.2
MHz
EN/UVLO Threshold Voltage
EN/UVLO Pin Hysteresis
VEN/UVLO Rising
l 1.44
1.5
1.56
V
l 50
75
100
mV
LDO Linear Regulator
VFBLDO
LDO Feedback Voltage
FBLDO Pin Bias Current
FBLDO Voltage Line Regulation
LDO Current Limit
FBLDO Pin Voltage = 800mV
7.5V < VL+ < 40V, VL+ – VLDO > 4V
l 777
794
811
mV
l
–20 –100
nA
0.005
%/ V
l 151
180
235
mA
LDO Current Limit Foldback
LDO Dropout Voltage
VLDOIN = 40V, VLDO = 0V
LDO Load Current = 25mA
LDO Load Current = 150mA
l 15
35
55
mA
l
60
90
mV
340
mV
LDO Minimum Load Current
l
150
175
µA
Power-On Reset
VRSTTH Reset Threshold as % of VFBOUT (VFBLDO)
FBOUT (FBLDO) Pin Voltage Falling (Figure 6) l 90.4 92.7
95
%
tRST
Reset Timeout Period
CPOR = 100nF, RST RPU = 100k (Figure 6)
l 10
12.5
15
ms
tUV
UV Detect to RST Asserted
Step VFBOUT (VFBLDO) from 0.9V to 0.5V,
l 11
24
37
µs
RST RPU = 100k (Figure 6)
Line Driver Thermal Shutdown
Thermal Shutdown Threshold (Note 8)
Thermal Shutdown Threshold (Note 8)
Thermal Shutdown Hysteresis (Note 8)
Junction Temperature TJ Increasing
Junction Temperature TJ Decreasing
125
140
155
°C
111
128
135
°C
10
12
14
°C
Line Drivers
IQH
IQL
VRQH
VRQL
DC Driver Current
P-Switching Output (ON State)
DC Driver Current
N-Switching Output (ON State)
Residual Voltage High (VL+ to VCQ1,Q2)
Residual Voltage Low (VCQ1,Q2)
VRQH (VRQL) Pulsing Threshold
VRQH (VRQL) Pulsing Threshold Hysteresis
CQ1, Q2 Pin Leakage Current
Receiver
VILIM ≤ 0.3V, 7.5V < VL+ < 40V
RILIM = 42.2k, 7.5V < VL+ < 40V
VILIM ≤ 0.3V, 7.5V < VL+ < 40V
RILIM = 42.2k, 7.5V < VL+ < 40V
ICQ1,Q2 = –100mA
ICQ1,Q2 = –250mA
ICQ1,Q2 = 100mA
ICQ1,Q2 = 250mA
VRQH (VRQL) Increasing
–40°C to 125°C, VTXENn < 0.4V
–40°C to 150°C, VTXENn < 0.4V
l 105
140
190
mA
l 280
330
420
mA
l 105
140
190
mA
l 280
330
420
mA
l
1.15 1.65
V
l
1.5
2.1
V
l
1.15 1.65
V
l
1.5
2.1
V
2.7
2.95
3.2
V
20
50
80
mV
l
±1.2
±3
µA
l
±1.2
±8
µA
VTHH
Input Threshold “H”
VTHL
Input Threshold “L”
VHYS
Input Hysteresis
VL+ > 18V (Figure 14)
VL+ > 18V (Figure 14)
VL+ > 18V (Figure 14)
l 10.5 11.8
13
V
l 8.0
9.6
11.2
V
l 1.8
2.2
2.6
V
3669fa
4
For more information www.linear.com/LT3669
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