LTC1439 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
LTC1439
Linear Technology
'LTC1439' PDF : 32 Pages View PDF
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1438/LTC1439
Efficiency vs Input Voltage
VOUT = 3.3V
100
VOUT = 3.3V
95
ILOAD = 1A
90
85
ILOAD = 100mA
80
Efficiency vs Input Voltage
VOUT = 5V
100
VOUT = 5V
95
ILOAD = 1A
90
ILOAD = 100mA
85
80
75
75
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1438 G01
VIN – VOUT Dropout Voltage
vs Load Current
0.5
RSENSE = 0.033Ω
VOUT DROP OF 5%
0.4 M1, M2: Si4412
0.3
0.2
0.1
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1438 G02
Load Regulation
0
– 0.25
RSENSE = 0.033Ω
– 0.50
– 0.75
–1.00
–1.25
0
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1438 G04
–1.50
0
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1438 G05
Input Supply Current
vs Input Voltage
2.5
35
30
2.0
SHUTDOWN
25
CURRENT
1.5
20
1.0
0.5
0
0
15
5V AND
3.3V ON
5V OFF
3.3V ON
10
5V ON
3.3V OFF
5 10 15 20
INPUT VOLTAGE (V)
5
0
25 30
1438 G07
Burst Mode is a registered trademark of Linear Technology Corporation.
INTVCC Regulation
vs INTVCC Load Current
2
EXTVCC = 0V
1
70°C
0
25°C
–1
–2
0
10
20
30
40
50
INTVCC LOAD CURRENT (mA)
1438 G08
Efficiency vs Load Current
100
VIN = 10V
95 VOUT = 5V
90 RSENSE = 0.033Ω
85
80
75
70
CONTINUOUS
MODE
Burst Mode®
OPERATION
65
Adaptive Power
60
MODE
55
50
0.001
0.01
0.1
1
10
LOAD CURRENT (A)
1435 G03
VITH Pin Voltage vs Output Current
3.0
2.5
2.0
1.5
Burst Mode
OPERATION
1.0
CONTINUOUS/Adaptive
Power MODE
0.5
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (%)
1438 G06
EXTVCC Switch Drop
vs INTVCC Load Current
300
70°C
200
25°C
– 45°C
100
0
0
5
10 15 20 25 30
INTVCC LOAD CURRENT (mA)
1438 G09
14389fb
5
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