Datasheet

LT8616
7
8616fa
For more information www.linear.com/LT8616
TYPICAL PERFORMANCE CHARACTERISTICS
Current Limit vs Temperature
Switch Resistance
vs Temperature Dropout Voltage vs Load
Start-Up Dropout (CH1, 5V) Start-Up Dropout (CH2, 3.3V)
Burst Frequency vs Load Minimum Load for Full Frequency
Top FET Current Limit
vs Duty Cycle
LOAD CURRENT (mA)
0
0
SWITCHING FREQUENCY (kHz)
700
600
500
400
300
200
100
800
50 200 250 300 350 400100
8616 G19
150
V
IN1
= V
IN2
=12V
f
SW
= 700kHz
SYNC = 0V
CH2, 3.3V
CH1, 5V
CH2, 3.3V
CH1, 5V
V
IN
(V)
0
0
LOAD CURRENT (mA)
70
60
50
40
30
20
10
80
5 20 25 30 35 4010
8616 G20
15
f
SW
= 700kHz
SYNC = 3V
CH2
CH1
DUTY CYCLE (%)
0
2.0
CURRENT LIMIT (A)
5.0
4.5
4.0
3.5
3.0
2.5
5.5
20 40 60 80 100
8616 G21
TEMPERATURE (°C)
–50
0
CURRENT LIMIT (A)
5
4
3
2
1
6
75 100 125 150–25 0 25
8616 G22
50
CH2, VALLEY
CH2, 0% DC PEAK
CH1, VALLEY
CH1, 0% DC PEAK
TEMPERATURE (°C)
–50
0
RESISTANCE (mΩ)
500
400
300
200
100
600
75 100 125 150–25 0 25
8616 G23
50
CH2, BOTTOM
CH2, TOP
CH1, BOTTOM
CH1, TOP
LOAD (A)
0
0
DROPOUT VOLTAGE (mV)
900
800
700
600
500
400
300
200
100
1000
1 1.5 2 2.50.5
8616 G24
CH2, 5V
CH1, 5V
f
SW
= 2MHz
100ms/DIV
V
IN1
1V/DIV
V
OUT1
1V/DIV
8616 G26
R
LOAD1
= 3.33Ω (1.5A)
100ms/DIV
V
IN1
AND V
IN2
1V/DIV
V
OUT2
1V/DIV
8616 G27
V
IN1
= V
IN2
R
LOAD2
= 1.32Ω (2.5A)
Start-Up Dropout (CH2, 3.3V)
100ms/DIV
V
IN2
1V/DIV
V
OUT2
1V/DIV
8616 G28
V
IN1
= 6V
R
LOAD2
= 1.32Ω (2.5A)
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