Datasheet

LT3494/LT3494A
4
3494fb
Output Voltage vs Temperature Minimum Switching Frequency
Quiescent Current–Not Switching
SHDN Current vs SHDN Voltage Peak Inductor Current (LT3494)
TEMPERATURE (°C)
–40
OUTPUT VOLTAGE CHANGE (%)
0
1.0
120
3494 G04
–1.0
–2.0
0
40
80
–20
20
60
100
2.0
–0.5
0.5
–1.5
1.5
LT3494
FIGURE 5 CIRCUIT
TEMPERATURE (°C)
–40
SWITCHING FREQUENCY (kHz)
49.0
50.0
120
3494 G05
48.0
47.0
0
40
80
–20
20
60
100
51.0
48.5
49.5
47.5
50.5
V
CC
= 3.6V
NO LOAD
V
CC
(V)
3
50
I
VCC
(μA)
55
65
70
75
100
85
5
7
8
3494 G06
60
90
95
80
4
6
9
10
SHDN PIN VOLTAGE (V)
0
0
SHDN PIN CURRENT (μA)
5
10
15
20
2468
3494 G07
10 12 14 16
Peak Inductor Current (LT3494A)
TEMPERATURE (°C)
–40
100
PEAK INDUCTOR CURRENT (mA)
150
200
250
300
040
80
120
3494 G08
350
400
–20 20
60
100
FIGURE 5 CIRCUIT
V
CC
= 3.6V
V
OUT
= 16V
LT3494 Switching Waveforms at
No Load
V
OUT
10mV/DIV
AC
COUPLED
SW
VOLTAGE
10V/DIV
V
CC
= 3.6V
V
OUT
= 16V
INDUCTOR
CURRENT
50mA/DIV
5μs/DIV
3494 G10
FIGURE 5 CIRCUIT
V
OUT
10mV/DIV
AC
COUPLED
SW
VOLTAGE
10V/DIV
INDUCTOR
CURRENT
100mA/DIV
2μs/DIV
3494 G11
FIGURE 5 CIRCUIT
V
CC
= 3.6V
V
OUT
= 16V
V
OUT
10mV/DIV
AC
COUPLED
SW
VOLTAGE
10V/DIV
INDUCTOR
CURRENT
100mA/DIV
500ns/DIV
3494 G12
FIGURE 5 CIRCUIT
V
CC
= 3.6V
V
OUT
= 16V
LT3494 Switching Waveforms at
1mA Load
LT3494 Switching Waveforms at
25mA Load
TEMPERATURE (°C)
–40
400
PEAK INDUCTOR CURRENT (mA)
450
500
550
600
040
80
120
3494 G09
650
700
–20 20
60
100
FIGURE 6 CIRCUIT
V
CC
= 3.6V
V
OUT
= 16V
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.