Datasheet

LT8612
6
8612fa
For more information www.linear.com/LT8612
TYPICAL PERFORMANCE CHARACTERISTICS
Frequency Foldback Soft-Start Tracking
Soft-Start Current
PG Low ThresholdsPG High Thresholds
RT Programmed Switching
Frequency
V
IN
UVLO
Switching Waveforms Switching Waveforms
FB VOLTAGE (V)
0
SWITCHING FREQUENCY (kHz)
300
400
500
0.6
1
8612 G19
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
8612 G20
0.6
0.4
0.2 0.4
0.8 1.2 1.4
0.2
0
TEMPERATURE (°C)
–50
SS PIN CURRENT (µA)
2.3
35
8612 G21
2.0
1.8
–25 5 65
1.7
1.6
2.4
2.2
2.1
1.9
95 125 155
V
SS
= 0.5V
TEMPERATURE (°C)
–55
7.0
PG THRESHOLD OFFSET FROM V
REF
(%)
7.5
8.5
9.0
9.5
12.0
10.5
5
65
95 125
8612 G22
8.0
11.0
11.5
10.0
–25
35
155
FB RISING
FB FALLING
TEMPERATURE (°C)
–55
–12.0
PG THRESHOLD OFFSET FROM V
REF
(%)
–11.5
–10.5
–10.0
–9.5
–7.0
–8.5
5
65
95 125
8612 G23
–11.0
–8.0
–7.5
–9.0
–25
35
155
FB RISING
FB FALLING
SWITCHING FREQUENCY (MHz)
0.2
RT PIN RESISTOR (kΩ)
150
200
250
1.8
8612 G24
100
50
125
175
225
75
25
0
0.6
1
1.4
2.2
TEMPERATURE (°C)
–55
INPUT VOLTAGE (V)
3.4
35
8612 G25
2.8
2.4
–25 5 65
2.2
2.0
3.6
3.2
3.0
2.6
95 125 155
I
L
1A/DIV
V
SW
5V/DIV
1µs/DIV
12V
IN
TO 5V
OUT
AT 2A
FRONT PAGE APP
8612 G27
I
L
0.5A/DIV
V
SW
5V/DIV
5µs/DIV
12V
IN
TO 5V
OUT
AT 20mA; FRONT PAGE APP
V
SYNC
= 0V
8612 G26
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