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LTC1149CN Datasheet(PDF) 4 Page - Linear Technology

Part # LTC1149CN
Description  High Efficiency Synchronous Step-Down Switching Regulators
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1149CN Datasheet(HTML) 4 Page - Linear Technology

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4
LTC1149
LTC1149-3.3/LTC1149-5
CC
HARA TERISTICS
A
TYPICALPERFOR
CE
Load Regulation
Efficiency vs Input Voltage
Line Regulation
Operating Frequency
vs (VIN – VOUT)
Gate Charge Supply Current
Current Sense Threshold Voltage
DC Supply Current
Supply Current in Shutdown
Off-Time vs VOUT
LOAD CURRENT (A)
0
–100
–80
–60
–40
–20
0
20
0.5
1.0
1.5
2.0
1149 G03
2.5
FIGURE 1 CIRCUIT
VIN = 24V
OPERATING FREQUENCY (kHz)
50
0
5
10
15
20
25
30
100
150
200
250
1149 G07
QP + QN = 100nC
QP + QN = 50nC
OUTPUT VOLTAGE (V)
1
40
50
60
5
1149 G08
30
20
0
2
34
10
80
70
0
LTC1149-5
LTC1149-3.3
TEMPERATURE (
°C)
20
80
100
120
100
1149 G09
60
40
0
40
60
80
20
160
140
0
MAXIMUM
THRESHOLD
MINIMUM
THRESHOLD
(VIN – VOUT) VOLTAGE (V)
0
1.0
1.5
20
1149 G06
0.5
0
5
10
15
25
2.0
VOUT = 5V
T = 70
°C
T = 0
°C
T = 25
°C
INPUT VOLTAGE (V)
0
200
300
40
1149 G05
100
0
10
20
30
50
400
VSD2 = 2V
INPUT VOLTAGE (V)
0
0
0.5
1.0
1.5
2.0
2.5
3.0
10
20
30
40
1149 G04
50
ACTIVE MODE
SLEEP MODE
INPUT VOLTAGE (V)
0
–60
–40
–20
0
20
40
60
10
20
30
40
1149 G02
50
FIGURE 1 CIRCUIT
ILOAD = 1A
INPUT VOLTAGE (V)
0
90
95
40
1149 G01
85
80
10
20
30
50
100
FIGURE 1 CIRCUIT
ILOAD = 1A


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