LT3645 Просмотр технического описания (PDF) - Linear Technology
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LT3645 Datasheet PDF : 24 Pages
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LT3645
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, BOOST = 15.3V, VCC2 = 3.3V, OUT2 = 1.8V unless
otherwise noted. (Notes 2, 3)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
Undervoltage Lockout on VIN
Overvoltage Lockout on VIN
Overvoltage Lockout Hysteresis
Rising
Rising
l
3
3.4
3.6
V
l 36
38.5
40
V
1
V
Feedback Voltage FB
0.79
0.8
0.81
V
l 0.785 0.8 0.813
FB Pin Bias Current
l
20
300
nA
Feedback Voltage Line Regulation
l
0.015
%/V
VIN Quiescent Current
VIN Quiescent Current in Shutdown
Switching Frequency
Not Switching
VEN/UVLO = 0.3V, VCC2 = 0V, VOUT2 = 0V
1.4
3
mA
0.01
2
μA
675
750
825
kHz
Maximum Duty Cycle
100mA Load
l 83
87
%
Switch Current Limit
Rising (Note 4)
0.8
1
1.25
A
DA Pin Current to Stop Osc
0.6
1
1.25
A
Switch VCESAT
Switch Leakage Current
ISW = 500mA
400
mV
2
μA
Minimum Boost Voltage Above Switch
BOOST Pin Current
BOOST Schottky Forward Drop
ISW = 500mA
ISW = 500mA
IOUT = 50mA
1.6
2.2
V
10
18
mA
0.7
0.9
V
EN/UVLO Threshold High
Rising
1.17 1.23 1.29
V
EN/UVLO Threshold Hysteresis
50
mV
EN/UVLO Input Current
Buck Soft-Start Time
VEN/UVLO = 5V
VEN/UVLO = 0V
25
50
μA
1
μA
0.9
1.8
ms
LDO Minimum Input Voltage VCC2
LDO Feedback Voltage FB2
ILOAD = 200mA, VOUT2 = 0.8V, VIN = 4.0V
1.1 1.38
V
l 782
797
810
mV
LDO FB2 Bias Current
l
20
300
nA
LDO Line Regulation
0.020
%/V
LDO Load Regulation
–1
mV
LDO Dropout Voltage (VCC2 to VOUT2)
LDO Dropout Voltage (VIN to VOUT2)
LDO Current Limit
ILOAD = 10mA
ILOAD = 10mA
ILOAD = 200mA
ILOAD = 200mA
ILOAD = 200mA
45
65
mV
l
145
mV
310
mV
1.1
1.4
V
l
1.7
V
270
mA
l 210
mA
EN2 Pin Threshold
Rising
Falling
l
1.3
1.6
V
l 0.5
0.8
V
LDO Soft-Start Time
0.6
1.2
ms
NPG VCESAT
NPG Leakage
FB2 NPG Threshold, % of Regulation Voltage
INPG = 1mA, VFB = VFB2 = 850mV
VNPG = 16V, VFB = VFB2 = 750mV
VFB = 800mV, VFB2 Rising
0.4
V
0.5
μA
88
90
92
%
3645f
3
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