LT1943 LINER [Linear Technology], LT1943 Datasheet - Page 4

• Manufacturer Part Number: LT1943
• Description: High Current Quad Output Regulator for TFT LCD Panels
• Manufacturer: LINER [Linear Technology]

LT1943
PARAMETER
SWITCH 4 (350mA INVERTER)
FB4 Voltage
FB4 Voltage Line Regulation
FB4 Pin Bias Current
NFB4 Voltage (V
NFB4 Voltage Line Regulation
NFB4 Pin Bias Current
Error Amplifier 4 Voltage Gain
Error Amplifier 4 Transconductance
Switch 4 Current Limit
Switch 4 V
Switch 4 Leakage Current
BIAS Pin Current due to SW4
Maximum Duty Cycle (SW4)
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1943E 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.
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
4
TYPICAL PERFOR A CE CHARACTERISTICS
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
0
Maximum Output Current
for V
T
A
CESAT
= 25 C
LOGIC
FB4
5
INPUT VOLTAGE (V)
-V
L1 = 4.7 H
NFB4
)
10
L1 = 3.3 H
15
W
1943 G01
U
20
5
4
3
2
1
0
A
SW1 Current Limit vs Duty Cycle
0
= 25 C. RUN-SS, SS-234 = 2.5V unless otherwise noted.
T
A
CONDITIONS
4.5V < V
(Note 4)
4.5V < V
(Note 5)
I
I
SW4
SW4
= 25 C
I = 5 A
The
20
= 0.3A
= 0.3A
IN
IN
DUTY CYCLE (%)
MINIMUM
< 22V
< 22V
denotes the specifications which apply over the full operating
40
TYPICAL
Note 3: The C
the FB threshold offset.
Note 4: Current flows into FB1, FB2, FB3 and FB4 pins.
Note 5: Current flows out of NFB4 pin.
60
80
T
pin is held low until FB1, FB2, FB3 and FB4 all ramp above
1943 G02
100
4.5
4.0
3.5
3.0
2.5
–50
SW1 Current Limit
1.215
1.205
1.23
1.22
0.35
MIN
84
83
–25
0
TEMPERATURE ( C)
1.245
1.25
0.01
0.01
TYP
100
100
200
450
260
0.5
0.1
15
88
25
50
1.275
1.275
MAX
1.27
1.27
0.03
0.03
600
600
390
0.7
1
75
100
UNITS
mhos
1943 G03
%/V
%/V
1943i
V/V
mV
mA
nA
nA
125
%
%
V
V
V
V
A
A