Datasheet

LT8620
6
8620fa
For more information www.linear.com/LT8620
TYPICAL PERFORMANCE CHARACTERISTICS
RT Programmed Switching
Frequency
V
IN
UVLO
Burst Frequency
Frequency Foldback
Minimum Load to Full Frequency
(SYNC DC High)
Soft-Start Tracking Soft-Start Current PG High Thresholds
PG Low Thresholds
LOAD CURRENT (mA)
0
SWITCHING FREQUENCY (kHz)
400
500
600
200
8620 G19
300
200
0
50
100
150
100
800
V
IN
= 12V
V
OUT
= 5V
700
FB VOLTAGE (V)
0
SWITCHING FREQUENCY (kHz)
300
400
500
0.6
1
8620 G21
200
100
0
0.2 0.4 0.8
600
700
800
V
OUT
= 3.3V
V
IN
= 12V
V
SYNC
= 0V
R
T
= 60.4k
TR/SS VOLTAGE (V)
0
FB VOLTAGE (V)
0.8
1.0
1.2
0.6 1.0
8620 G22
0.6
0.4
0.2 0.4
0.8 1.2 1.4
0.2
0
V
SS
= 0.5V
TEMPERATURE (°C)
–55
–25
5
35
65
95
125
155
1.8
1.9
2.0
2.1
2.2
SS PIN CURRENT (µA)
8620 G23
TEMPERATURE (°C)
–50
7.0
PG THRESHOLD OFFSET FROM V
REF
(%)
7.5
8.5
9.0
9.5
12.0
10.5
0 25
75
100 125
8620 G24
8.0
11.0
11.5
10.0
–25
50
150
FB RISING
FB FALLING
TEMPERATURE (°C)
–50
–12.0
PG THRESHOLD OFFSET FROM V
REF
(%)
–11.5
–10.5
–10.0
–9.5
–7.0
–8.5
0
75
100 125
8620 G25
–11.0
–8.0
–7.5
–9.0
–25
25 50
150
FB RISING
FB FALLING
SWITCHING FREQUENCY (MHz)
0.2
RT PIN RESISTOR (kΩ)
150
200
250
1.8
8620 G26
100
50
125
175
225
75
25
0
0.6
1
1.4
2.2
TEMPERATURE (°C)
–55
INPUT VOLTAGE (V)
3.4
35
8620 G27
2.8
2.4
–25 5 65
2.2
2.0
3.6
3.2
3.0
2.6
95 125 155
INPUT VOLTAGE (V)
LOAD CURRENT (mA)
60
80
100
15 25 55 65
8620 G20
40
20
0
5 35 45
V
OUT
= 5V
f
SW
= 700kHz
T
A
= 25°C, unless otherwise noted.
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