LTC1159/LTC1159-3.3/LTC1159-5
TYPICAL PERFOR A CE CHARACTERISTICS
Efficiency vs Input Voltage
100
FIGURE 1 CIRCUIT
I
LOAD
= 1A
60
40
95
EFFICIENCY (%)
∆V
OUT
(mV)
90
NOTE 6
0
–20
NOTE 6
∆V
OUT
(mV)
85
–40
80
0
5
10
15 20 25 30
INPUT VOLTAGE (V)
35
40
EXTV
CC
Pin Current
10
FIGURE 1 CIRCUIT
NORMALIZED FREQUENCY
8
I
LOAD
= 1A
6
NOTE 6
4
I
LOAD
= 100mA
2
I
LOAD
= 0
0
0
5
10
15 20
25 30
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
EXTV
CC
CURRENT (mA)
EXTV
CC
Switch Drop
600
500
OFF-TIME (µs)
400
300
200
100
0
0
5
10
15
SWITCH CURRENT (mA)
20
50
40
30
20
10
LTC1159-3.3
0
0
1
3
4
2
OUTPUT VOLTAGE (V)
5
LTC1159-5
SENSE VOLTAGE (mV)
EXTV
CC
– V
CC
(mV)
4
U W
LTC1159 • TPC01
Line Regulation
FIGURE 1 CIRCUIT
I
LOAD
= 1A
Load Regulation
20
0
–20
–40
–60
–80
–100
0
0.5
1.0
1.5
2.0
LOAD CURRENT (A)
2.5
FIGURE 1 CIRCUIT
V
IN
= 24V
20
–60
0
5
10
15 20 25 30
INPUT VOLTAGE (V)
35
40
LT1159 • TPC02
LTC1159 • TPC03
V
IN
Pin Current
500
FIGURE 1 CIRCUIT
2.0
Operating Frequency
vs (V
IN
– V
OUT
)
V
OUT
= 5V
T = 0°C
1.5
T = 25°C
T = 70°C
1.0
400
300
NORMAL
200
NOTE 6
0.5
100
V
SHDN2
= 2V
0
35
40
0
5
10
15 20 25 30
INPUT VOLTAGE (V)
35
40
0
0
5
15
20
10
(V
IN
– V
OUT
) VOLTAGE (V)
25
LTC1159 • TPC04
LTC1159 • TPC05
LTC1159 • TPC06
Off-Time vs V
OUT
80
70
60
160
140
120
100
80
60
40
20
0
Current Sense Threshold Voltage
MAXIMUM
THRESHOLD
MINIMUM
THRESHOLD
0
20
60
40
TEMPERATURE (°C)
80
100
LTC1159 • TPC07
LTC1159 • TPC08
LTC1159 • TPC09
LINER [ LINEAR TECHNOLOGY ]
