LT3640 Просмотр технического описания (PDF) - Linear Technology
Номер в каталоге
Компоненты Описание
производитель
LT3640 Datasheet PDF : 24 Pages
| |||
LT3640
Electrical Characteristics The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VIN2 = 3.3V, EN/UVLO = 12V, EN2 = 3.3V, unless otherwise noted.
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VIN Undervoltage Lockout Threshold
VIN Undervoltage Release Threshold
VIN Overvoltage Lockout Threshold
VIN Overvoltage Release Threshold
Quiescent Current from VIN
EN/UVLO = 0.3V
Not Switching
l
3.6
4
V
l
3.8
4.2
V
l 35
36.5
38
V
l 34
35.5
37
V
0.1
1
µA
275
375
µA
EN/UVLO Threshold Voltage
1.2
1.26
1.3
V
EN/UVLO High Bias Current
EN/UVLO = Threshold + 60mV
2
µA
EN/UVLO Low Bias Current
EN/UVLO = Threshold – 60mV
0.1
µA
SYNC Input Frequency
0.35
2.5
MHz
SYNC Threshold Voltage
0.4
0.8
1
V
Switching Frequency
RT = 32.4k
RT = 182k
l 1.75
2
2.35
MHz
l 450
500
550
kHz
FB1 Voltage
l 1.24 1.265 1.29
V
FB1 Bias Current
FB1 = 1.265V
30
100
nA
FB1 Line Regulation
SW1 Minimum Off-Time
5V < VIN < 30V
0.001
%/V
70
100
ns
SW1 VCESAT
SW1 Leakage Current
ISW1 = 800mA
400
mV
0.1
1
µA
SW1 Current Limit
FB1 = 1V (Note 3)
FB1 = 0.1V
l 2.2
2.8
3.4
A
1.8
A
DA Current limit
FB1 = 1V (Note 4)
FB1 = 0.1V
l 1.35
1.7
2.2
A
1
A
BST Pin Current
Minimum BST-SW Voltage
ISW1 = 800mA
30
50
mA
2
2.7
V
ΔFB1 to Start LV Channel
80
100
130
mV
ΔFB1 Hysteresis to Stop LV Channel
30
50
90
mV
VIN2 Minimum Operating Voltage
VIN2 Maximum Operating Voltage
EN2 Threshold Voltage
l
2.3
2.5
V
l
5.5
V
0.3
1
1.5
V
FB2 Voltage
l 588
600
612
mV
FB2 Bias Current
FB2 = 0.6V
0
100
nA
FB2 Line Regulation
SW2 Minimum Off-Time
2.5V < VIN2 < 5.5V
0.01
%/V
70
100
ns
SW2 PMOS Current Limit
(Note 5)
l 1.5
1.9
2.2
A
SW2 NMOS Current Limit
(Note 5)
l 1.2
1.6
2
A
SW2 PMOS RDS(ON)
SW2 NMOS RDS(ON)
ΔFB2 to Enable PGOOD
ISW2 = 0.5A (Note 6)
ISW2 = 0.5A (Note 6)
275
mΩ
200
mΩ
20
40
80
mV
ΔFB2 Hysteresis to Disable PGOOD
20
40
80
mV
PGOOD Voltage
FB2 = 0.6V, IPGOOD = 1mA
200
320
mV
3640f
Share Link: 