Datasheet

LT3493
4
3493fb
Maximum Load Current,
V
OUT
= 5V, L = 8.2μH
Maximum Load Current,
V
OUT
= 5V, L = 33μH
Maximum Load Current,
V
OUT
= 3.3V, L = 4.7μH
Maximum Load Current,
V
OUT
= 3.3V, L = 10μH
Switch Voltage Drop Undervoltage Lockout
Switching Frequency Frequency Foldback Soft-Start
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise noted.
V
IN
(V)
8
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
20 28
3493 G04
12 16
24
OUTPUT CURRENT (A)
TYPICAL
MINIMUM
V
IN
(V)
8
1.60
1.50
1.40
1.30
1.20
1.10
1.00
0.90
20 28
3493 G22
12 16
24
OUTPUT CURRENT (A)
TYPICAL
MINIMUM
V
IN
(V)
5
1.40
1.50
1.60
25
3493 G05
1.30
1.20
10 15 20 30
1.10
1.00
0.90
OUTPUT CURRENT (A)
TYPICAL
MINIMUM
V
IN
(V)
5
1.40
1.50
1.60
25
3493 G21
1.30
1.20
10 15 20 30
1.10
1.00
0.90
OUTPUT CURRENT (A)
TYPICAL
MINIMUM
SWITCH CURRENT (A)
0
V
CE(SW)
(mV)
150
450
500
550
0.4
0.8
1.0
3493 G06
50
350
250
100
400
0
300
200
0.2
0.6
1.4
1.2
1.6
1.8
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
TEMPERATURE (°C)
UVLO (V)
3.60
3.80
4.00
125
3493 G08
3.40
3.20
3.50
3.70
3.90
3.30
3.10
3.00
–25–50
250
75 100 150
50
TEMPERATURE (°C)
FREQUENCY (kHz)
720
760
800
125
3493 G09
680
640
700
740
780
660
620
600
–25–50
250
75 100 150
50
FEEDBACK VOLTAGE (mV)
0
SWITCHING FREQUENCY (kHz)
400
600
800
3493 G11
200
0
200
400
600
100
300
500
700
800
300
500
100
700
SHDN PIN VOLTAGE (V)
0
0
SWITCH CURRENT LIMIT (A)
0.2
0.6
0.8
1.0
2.0
1.4
0.50 1 1.25
3493 G13
0.4
1.6
1.8
1.2
0.25 0.75 1.50 1.75 2
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