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LTC1438CG-ADJ Datasheet(PDF) 5 Page - Linear Technology

Part # LTC1438CG-ADJ
Description  Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators
Download  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1438CG-ADJ Datasheet(HTML) 5 Page - Linear Technology

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5
LTC1438/LTC1439
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Input Voltage
VOUT = 3.3V
VIN – VOUT Dropout Voltage
vs Load Current
Efficiency vs Load Current
VITH Pin Voltage vs Output Current
Load Regulation
Input Supply Current
vs Input Voltage
EXTVCC Switch Drop
vs INTVCC Load Current
INPUT VOLTAGE (V)
0
70
75
80
85
90
100
5
10
15
20
1438 G01
25
30
95
ILOAD = 1A
ILOAD = 100mA
VOUT = 3.3V
Efficiency vs Input Voltage
VOUT = 5V
INPUT VOLTAGE (V)
0
70
75
80
85
90
100
5
10
15
20
1438 G02
25
30
95
ILOAD = 1A
ILOAD = 100mA
VOUT = 5V
LOAD CURRENT (A)
0.001
50
55
65
70
75
100
85
0.01
0.1
1
1435 G03
60
90
95
80
10
Adaptive Power
MODE
CONTINUOUS
MODE
VIN = 10V
VOUT = 5V
RSENSE = 0.33Ω
Burst Mode
®
OPERATION
LOAD CURRENT (A)
0
0
0.2
0.1
0.3
0.4
0.5
0.5
1.0
1.5
2.0
1438 G04
2.5
3.0
RSENSE = 0.033Ω
VOUT DROP OF 5%
M1, M2: Si4412
LOAD CURRENT (A)
0
0
0.5
1.0
1.5
2.0
1438 G05
2.5
3.0
– 0.25
– 0.50
– 0.75
–1.00
–1.25
–1.50
RSENSE = 0.033Ω
OUTPUT CURRENT (%)
0
1.0
2.0
3.0
0.5
1.5
2.5
20
40
60
80
1438 G06
100
10
030
50
70
90
Burst Mode
OPERATION
CONTINUOUS/Adaptive
Power MODE
INPUT VOLTAGE (V)
0
0
0.5
1.0
1.5
2.0
2.5
0
5
10
15
20
25
30
35
5
10
15
20
1438 G07
25
30
SHUTDOWN
CURRENT
5V OFF
3.3V ON
5V AND
3.3V ON
5V ON
3.3V OFF
INTVCC LOAD CURRENT (mA)
0
200
300
20
1438 G09
100
0
5
10
15
25
30
–45
°C
25
°C
70
°C
INTVCC Regulation
vs INTVCC Load Current
INTVCC LOAD CURRENT (mA)
0
0
1
50
40
1438 G08
–1
–2
10
20
30
2
70
°C
25
°C
EXTVCC = 0V
Burst Mode is a trademark of Linear Technology Corporation.


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