lt3641 Linear Technology Corporation, lt3641 Datasheet - Page 3

• Manufacturer Part Number: lt3641
• Description: Dual Monolithic Buck Regulator With Power-on Reset And Watchdog Timer
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
V
V
Quiescent Current from V
EN/UVLO Threshold Voltage
EN/UVLO High Bias Current
EN/UVLO Low Bias Current
SYNC Input Frequency
SYNC Threshold Voltage
Switching Frequency
FB1 Voltage
FB1 Bias Current
FB1 Line Regulation
SW1 Minimum Off-Time
SW1 V
SW1 Leakage Current
SW1 Current Limit
DA Current limit
BST Pin Current
Minimum BST-SW Voltage
V
V
EN2 Threshold
EN2 Hysteresis
EN2 Bias Current
FB2 Voltage
FB2 Bias Current
FB2 Line Regulation
SW2 PMOS Current Limit
SW2 NMOS Current Limit
SW2 PMOS R
SW2 NMOS R
ΔFB2 to Enable PGOOD2
ΔFB2 Hysteresis to Disable PGOOD2
PGOOD2 Voltage
IN
IN
IN2
IN2
Undervoltage Lockout Threshold
Undervoltage Release Threshold
Minimum Operating Voltage
Maximum Operating Voltage
CESAT
DS(ON)
DS(ON)
IN
CONDITIONS
EN/UVLO = 0.3V
Not Switching
EN/UVLO = Threshold + 60mV
EN/UVLO = Threshold – 60mV
RT = 32.4k
RT = 182k
FB1 = 1.265V
5V < V
I
FB1 = 1V (Note 3)
FB1 = 0.1V
FB1 = 1V (Note 4)
FB1 = 0.1V
I
Rising
EN2 = EN2 Threshold
FB2 = 0.6V
2.5V < V
(Note 5)
(Note 5)
I
I
FB2 = 0.6V, I
SW1
SW1
SW2
SW2
A
= 25°C. V
= 800mA
= 800mA
= 0.5A (Note 6)
= 0.5A (Note 6)
IN
IN2
< 30V
The
< 5.5V
PGOOD2
IN
l
= 12V, V
denotes the specifi cations which apply over the full operating
= 1mA
IN2
= 3.3V, EN/UVLO = 12V, EN2 = 3.3V, unless otherwise noted.
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
0.35
1.75
1.24
1.35
1.13
450
585
1.2
0.4
2.2
1.5
1.2
50
20
20
1.265
0.001
1.26
1.18
0.01
TYP
275
500
400
600
275
200
200
3.6
3.8
0.1
0.1
0.8
0.1
2.8
1.8
1.7
2.3
1.9
1.6
30
70
30
80
50
40
40
2
2
1
2
0
LT3641
MAX
2.35
1.29
1.23
375
550
100
100
110
500
615
100
320
4.2
1.3
2.5
3.4
2.2
2.7
2.5
5.5
2.2
50
80
80
4
1
1
1
2
UNITS
3
MHz
MHz
3641f
%/V
%/V
mΩ
mΩ
kHz
mV
mA
mV
mV
mV
mV
mV
μA
μA
μA
μA
nA
μA
nA
nA
ns
V
V
V
V
V
A
A
A
A
V
V
V
V
A
A