Datasheet

4
LTC1159
LTC1159-3.3/LTC1159-5
Load Regulation
Efficiency vs Input Voltage
Line Regulation
Operating Frequency
vs (V
IN
– V
OUT
)
EXTV
CC
Pin Current
V
IN
Pin Current
INPUT VOLTAGE (V)
0
80
EFFICIENCY (%)
85
90
95
100
5101520
LTC1159 • TPC01
25 30 35 40
FIGURE 1 CIRCUIT
I
LOAD
= 1A
NOTE 6
INPUT VOLTAGE (V)
0
–60
∆V
OUT
(mV)
–40
–20
0
20
10 20
30
40
LT1159 • TPC02
40
60
515
25
35
FIGURE 1 CIRCUIT
I
LOAD
= 1A
NOTE 6
LOAD CURRENT (A)
0
–100
∆V
OUT
(mV)
–80
–60
–40
–20
0
20
0.5 1.0 1.5 2.0
LTC1159 • TPC03
2.5
FIGURE 1 CIRCUIT
V
IN
= 24V
INPUT VOLTAGE (V)
0
EXTV
CC
CURRENT (mA)
6
8
10
15 25 40
LTC1159 • TPC04
4
2
0
510
20
30 35
FIGURE 1 CIRCUIT
NOTE 6
I
LOAD
= 1A
I
LOAD
= 100mA
I
LOAD
= 0
INPUT VOLTAGE (V)
0
SUPPLY CURRENT (µA)
300
400
500
15 25 40
LTC1159 • TPC05
200
100
0
510
20
30 35
FIGURE 1 CIRCUIT
NOTE 6
NORMAL
V
SHDN2
= 2V
(V
IN
– V
OUT
) VOLTAGE (V)
0
NORMALIZED FREQUENCY
1.0
1.5
20
LTC1159 • TPC06
0.5
0
5
10
15
25
2.0
V
OUT
= 5V
T = 70°C
T = 0°C
T = 25°C
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Note 6: The LTC1159C, LTC1159C-3.3, and LTC1159C-5 are not tested
and not quality assurance sampled at –40°C and 85°C. These
specifications are guaranteed by design and/or correlation. The LTC1159I,
LTC1159I-3.3 and LTC1159I-5 are guaranteed and tested over the –40°C
to 85°C operating temperature range.
E
LECTR
IC
AL C CHARA TERIST
ICS
Note 7: The logic-level power MOSFETs shown in Figure 1 are rated for
V
DS(MAX)
= 30V. For operation at V
IN
> 30V, use standard threshold
MOSFETs with EXTV
CC
powered from a 12V supply. See Applications
Information.