lt1941 Linear Technology Corporation, lt1941 Datasheet - Page 4

• Manufacturer Part Number: lt1941
• Description: Triple Monolithic Switching Regulator
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
The
V
LT1941
PARAMETER
NFB3 Voltage (V
FB3 Pin Output Current
PGOOD3 Threshold Offset
Error Amplifier Transconductance
Error Amplifier Voltage Gain
V
V
Frequency Shift Threshold on FB3
Switch 3 Current Limit (Note 5)
Switch 3 V
BIAS2 Pin Current
Switch 3 Leakage Current
Maximum Duty Cycle
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1941E is guaranteed to meet performance specifications
from 0°C to 70°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at higher duty cycles.
Note 4: This is the minimum voltage across the boost capacitor needed to
guarantee full saturation of the internal power switch.
TYPICAL PERFOR A CE CHARACTERISTICS
4
IN
C
C3
Switching Threshold
, V
to Switch Current Gain
90
70
60
50
80
●
BIAS1
0
Efficiency, V
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T
V
T
A
IN
CESAT
= 25°C
= 5V
, V
0.5
BIAS2
FB3
LOAD CURRENT (A)
-V
OUT1
= 5V, V
NFB
1
)
= 1.8V
1.5
BOOST1
W
, V
2
BOOST2
1941 G01
U
2.5
= 8V, unless otherwise noted. (Note 2)
CONDITIONS
V
V
I
I
SW
SW
FB3
FB
80
60
50
Rising
= 1A
= 1A
90
70
= 1.35V, V
0
Efficiency, V
V
T
A
IN
= 25°C
= 5V
0.25
NFB
LOAD CURRENT (A)
0.5
= –0.1V
OUT2
0.75
Note 5: Current limit is guaranteed by design and/or correlation to static
test.
Note 6: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 7: Guaranteed by design, not 100% tested.
= 3.3V
1
1.25
1941 G07
1.5
●
●
●
●
90
80
70
60
50
0
Efficiency, V
1.212
1.205
V
T
MIN
150
1.5
77
IN
A
= 25°C
= 5V
50
LOAD CURRENT (mA)
100
1.24
0.65
0.01
TYP
350
120
800
150
240
1.1
30
86
5
2
OUT3
150
= –12V
1.258
1.260
MAX
320
2.9
45
10
200
A
= 25°C.
250
µMhos
UNITS
1941 G08
1941fa
V/V
A/V
mV
mV
mA
µA
µA
300
%
V
V
V
V
A