ltc1149-5 Linear Technology Corporation, ltc1149-5 Datasheet - Page 4

• Manufacturer Part Number: ltc1149-5
• Description: High Efficiency Synchronous Step-down Switching Regulators
• Manufacturer: Linear Technology Corporation

LTC1149
LTC1149-3.3/LTC1149-5
TYPICAL PERFOR
4
100
3.0
2.5
2.0
1.5
1.0
0.5
30
25
20
15
10
90
85
80
95
0
5
0
50
0
0
Efficiency vs Input Voltage
DC Supply Current
Gate Charge Supply Current
FIGURE 1 CIRCUIT
I
LOAD
10
OPERATING FREQUENCY (kHz)
10
= 1A
100
Q
P
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
+ Q
20
N
20
= 100nC
ACTIVE MODE
SLEEP MODE
150
Q
30
30
P
+ Q
N
200
= 50nC
W
40
40
1149 G07
A
1149 G01
1149 G04
U
250
50
50
CE
C
HARA TERISTICS
–20
–40
–60
200
100
400
300
60
40
20
60
50
30
80
70
40
20
10
0
0
0
0
0
0
Line Regulation
Supply Current in Shutdown
Off-Time vs V
FIGURE 1 CIRCUIT
I
LOAD
V
SD2
10
= 1A
= 2V
10
C
1
LTC1149-3.3
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (V)
INPUT VOLTAGE (V)
20
20
OUT
2
30
30
3
LTC1149-5
40
40
4
1149 G08
1149 G02
1149 G05
50
50
5
–100
–20
–40
–60
–80
120
100
0.5
160
140
2.0
1.5
1.0
20
80
60
40
20
0
0
0
0
0
Load Regulation
0
Operating Frequency
vs (V
Current Sense Threshold Voltage
V
OUT
IN
0.5
= 5V
20
5
– V
(V
IN
LOAD CURRENT (A)
TEMPERATURE ( C)
OUT
– V
1.0
10
40
OUT
)
T = 0 C
T = 70 C
) VOLTAGE (V)
1.5
THRESHOLD
THRESHOLD
FIGURE 1 CIRCUIT
V
15
60
MAXIMUM
MINIMUM
IN
= 24V
T = 25 C
2.0
20
80
1149 G09
1149 G06
1149 G03
100
2.5
25