LTC1538-AUX/LTC1539
TYPICAL PERFORMANCE CHARACTERISTICS
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)
1538/39 • G01
VIN – VOUT Dropout Voltage vs
Load Current
0.5
RSENSE = 0.033Ω
VOUT DROP OF 5%
0.4
0.3
0.2
0.1
70
0
5 10 15 20 25 30
INPUT VOLTAGE (V)
1538/39 • 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)
1538/39 • G04
–1.50
0
0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
1538/39 • G05
Input Supply Current
vs Input Voltage
2.5
INTVCC Regulation
vs INTVCC Load Current
100
2
EXTVCC = 0V
2.0
80
5V, 3.3V OFF
1
5V STANDBY
70°C
1.5
60
0
1.0
5V, 3.3V ON
40
25°C
5V OFF, 3.3V ON
–1
0.5
20
5V ON, 3.3V OFF
0
0
–2
0 5 10 15 20 25 30
0
INPUT VOLTAGE (V)
LTC1538/39 • TPC07
Adaptive Power and Burst Mode are trademarks of Linear Technology Corporation.
10
20
30
40
50
INTVCC LOAD CURRENT (mA)
1538/39 • G08
Efficiency vs Load Current
100
VIN = 10V
95 VOUT = 5V
90 RSENSE = 0.33Ω
85
80
75
70
CONTINUOUS
MODE
Burst ModeTM
OPERATION
65
Adaptive PowerTM
60
MODE
55
50
0.001
0.01
0.1
1
10
LOAD CURRENT (A)
1538/39 • G03
VITH Pin Voltage vs Output Current
3.0
2.5
2.0
1.5
Burst Mode
OPERATION
1.0
0.5
CONTINUOUS/
Adaptive Power
MODE
0
0 10 20 30 40 50 60 70 80 90 100
OUTPUT CURRENT (%)
1538/39 • 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)
1538/39 • G09
5