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LT3640 Datasheet(PDF) 3 Page - Linear Technology

Part # LT3640
Description  Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3640 Datasheet(HTML) 3 Page - Linear Technology

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LT3640
3
3640p
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.
ELECTRICAL CHARACTERISTICS
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN Undervoltage Lockout Threshold
l
3.6
4
V
VIN Undervoltage Release Threshold
l
3.8
4.2
V
VIN Overvoltage Lockout Threshold
l
35
36.5
38
V
VIN Overvoltage Release Threshold
l
34
35.5
37
V
Quiescent Current from VIN
EN/UVLO = 0.3V
Not Switching
0.1
275
1
375
μA
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
l
1.75
450
2
500
2.35
550
MHz
kHz
FB1 Voltage
l
1.24
1.265
1.29
V
FB1 Bias Current
FB1 = 1.265V
30
100
nA
FB1 Line Regulation
5V < VIN < 30V
0.001
%/V
SW1 Minimum Off-Time
70
ns
SW1 VCESAT
ISW1 = 800mA
400
mV
SW1 Leakage Current
0.1
1
μA
SW1 Current Limit
FB1 = 1V (Note 3)
FB1 = 0.1V
l
2.2
2.8
1.8
3.3
A
A
DA Current limit
FB1 = 1V (Note 4)
FB1 = 0.1V
l
1.1
1.35
0.8
1.7
A
A
BST Pin Current
ISW1 = 800mA
30
50
mA
Minimum BST-SW Voltage
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
l
2.3
2.5
V
VIN2 Maximum Operating Voltage
l
5.5
V
EN2 Threshold Voltage
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
2.5V < VIN2 < 5.5V
0.01
%/V
SW2 Minimum Off-Time
70
ns
SW2 PMOS Current Limit
(Note 5)
l
1.5
1.9
2.2
A
SW2 NMOS Current Limit
(Note 5)
l
0.9
1.1
1.3
A
SW2 PMOS RDS(ON)
ISW2 = 0.5A (Note 6)
275
mΩ
SW2 NMOS RDS(ON)
ISW2 = 0.5A (Note 6)
200
mΩ
ΔFB2 to Enable PGOOD
20
40
80
mV
ΔFB2 Hysteresis to Disable PGOOD
20
40
80
mV
PGOOD Voltage
FB2 = 0.6V, IPGOOD = 1mA
200
320
mV



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