LT1947 LINER [Linear Technology], LT1947 Datasheet - Page 3

• Manufacturer Part Number: LT1947
• Description: Adjustable Output TFT-LCD Triple Switching Regulator
• Manufacturer: LINER [Linear Technology]

TYPICAL PERFOR A CE CHARACTERISTICS
800
600
400
200
1.8
1.6
1.4
1.2
1.0
0.8
65
35
0
85
80
75
70
60
55
50
45
40
–50
0
SW1 Current Limit
Switch 2 Saturation Voltage
0
3.3V TFT-LCD Converter Efficiency
25
–25
0.1
AV
50
SWITCH CURRENT (A)
TEMPERATURE ( C)
DD
0.2
0
LOAD CURRENT (mA)
75
V
IN
0.3
25
100 125
= 3V
25 C
90 C
–45 C
V
0.4
IN
50
= 3.3V
150 175 200
W
V
IN
0.5
75
= 2.7V
1947 G04
1947 G07
1947 G01
U
100
0.6
100
1.0
0.8
0.6
0.4
0.2
90
80
70
60
50
12
10
0
8
6
4
–50
–50
–50
SW1 Maximum Duty Cycle
SW2 Current Limit
Supply Current
SHDN = 2.4V
–25
–25
–25
TEMPERATURE ( C)
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
0
25
25
25
50
50
50
75
75
75
1947 G08
1947 G05
1947 G02
100
100
100
–10
500
400
300
200
100
3.2
3.0
2.8
2.6
2.4
2.2
–2
–4
–6
–8
0
–50
–50
C
0
Oscillator Frequency
Switch 1 Saturation Voltage
T
Current Source
0.2
–25
–25
0.4
SWITCH CURRENT (A)
TEMPERATURE ( C)
TEMPERATURE ( C)
0
0
90 C
–45 C
0.6
25 C
25
25
0.8
LT1947
50
50
1
75
75
1.2
1947 G03
1947 G09
1947 G06
3
1947f
100
100
1.4