LT3581 LINER [Linear Technology], LT3581 Datasheet - Page 3

• Manufacturer Part Number: LT3581
• Description: 3.3A Boost/Inverting DC/DC Converter with Fault Protection
• Manufacturer: LINER [Linear Technology]

elecTrical characTerisTics
temperature range, otherwise specifications are at T
PARAMETER
Minimum Input Voltage
V
Positive Feedback Voltage
Negative Feedback Voltage
Positive FB Pin Bias Current
Negative FB Pin Bias Current
Error Amp Transconductance
Error Amp Voltage Gain
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency, f
Switching Frequency in Foldback
Switching Frequency Range
SYNC High Level for Synchronization
SYNC Low Level for Synchronization
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio
f
Minimum Off-Time
Minimum On-Time
SW1 Current Limit
Current Sharing (SW2/SW1)
SW1 + SW2 Current Limit
Switch V
SW1 Leakage Current
SW2 Leakage Current
SYNC
IN
Overvoltage Lockout
/f
OSC
CESAT
OSC
CONDITIONS
V
V
ΔI = 10μA
Not Switching
V
2.5V ≤ V
R
R
Compared to Normal f
Free-Running or Synchronizing
V
At All Duty Cycles
At All Duty Cycles, SW2/SW1 = 78% (Note 3)
SW1 & SW2 Tied Together, I
V
V
FB
FB
SHDN
T
T
SYNC
SW1
SW2
= 34k
= 432k
= Positive Feedback Voltage, Current into Pin
= Negative Feedback Voltage, Current out of Pin
= 5V
= 5V
= 0V to 2V
= 0V
IN
≤ 20V
A
= 25°C. V
The
OSC
l
IN
SW1
denotes the specifications which apply over the full operating
= 5V, V
+ I
SW2
SHDN
= 2.75A
= V
IN
, V
FAULT
= V
IN
l
l
l
l
l
l
l
l
l
l
l
l
, unless otherwise noted. (Note 2).
1.195
22.1
2.25
MIN
180
200
1.3
1.9
3.3
81
81
20
3
1.215
23.5
83.3
83.3
0.01
0.01
0.01
TYP
270
200
250
2.3
1.9
2.5
1/6
3/4
2.4
4.3
70
45
55
78
9
0
LT3581
1.230
2500
MAX
85.5
0.05
2.75
220
2.5
2.3
0.4
5.4
25
16
85
80
1
3
1
1
µmhos
UNITS

MHz
ratio
3581f
%/V
kHz
kHz
V/V
mV
mA
mV
µA
µA
µA
µA
µA
ns
ns
%
%
V
V
V
V
V
A
A