LTC3630A Datasheet, PDF (6/24 Pages) Linear Technology – High Efficiency, 76V 500mA Synchronous Step-Down Converter

LTC3630A
Typical Performance Characteristics
Quiescent V_IN Supply Current
vs Temperature
20
V_IN = 12V
16
SLEEP
12
8
SHUTDOWN
4
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3630a G16
Switch Leakage Current
vs Temperature
14
V_IN = 65V
12
10
8
6
4
SW = 65V
2
0
–2
SW = 0V
–4
–6
–55 –25
5 35 65 95 125 155
TEMPERATURE (°C)
3630a G19
Switch On-Resistance
vs Input Voltage
2.0
1.8
1.6
1.4
1.2
TOP
1.0
0.8
0.6
BOTTOM
0.4
0.2
0
0 10 20 30 40 50 60 70
INPUT VOLTAGE (V)
3630a G17
RUN Comparator Threshold
Voltage vs Temperature
1.30
1.25
RISING
1.20
1.15
FALLING
1.10
Switch On-Resistance
vs Temperature
1.6
V_IN = 12V
1.4
1.2
TOP
1.0
0.8
BOTTOM
0.6
0.4
0.2
0
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3630a G18
Operating Waveforms
SWITCH
VOLTAGE
50V/DIV
OUTPUT
VOLTAGE
50mV/DIV
INDUCTOR
CURRENT
500mA/DIV
1.05
1.00
–55 –25
5 35 65 95
TEMPERATURE (°C)
125 155
3630a G20
V_IN = 76V
10µs/DIV
V_OUT = 5V
I_LOAD = 400mA
FIGURE 13 CIRCUIT
3630a G21
3630af
6
For more information www.linear.com/LTC3630A