LTC3632_15 Datasheet, PDF (5/22 Pages) Linear Technology – High Efficiency, High Voltage 20mA Synchronous Step-Down Converter

LTC3632
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Peak Current Trip Threshold
vs R_ISET
60
V_IN = 10V
50
40
30
20
10
0
0 200 400 600 800 1000 1200
R_ISET (kΩ)
3632 G10
Quiescent Supply Current
vs Temperature
14
V_IN = 10V
12
SLEEP
10
8
6
4
SHUTDOWN
2
0
–40 –10 20 50 80
TEMPERATURE (°C)
Switch Leakage Current
vs Temperature
0.30
V_IN = 50V
0.25
110
3632 G13
0.20
0.15
0.10
SW = 50V
0.05
SW = 0V
0
–40 –10 20 50 80
TEMPERATURE (°C)
110
3632 G16
Peak Current Trip Threshold
vs Input Voltage
60
V_IN = 10V
50
I_SET OPEN
40
30
R_SET = 500k
20
I_SET = GND
10
Quiescent Supply Current
vs Input Voltage
14
12
SLEEP
10
8
6
4
SHUTDOWN
2
0
0 5 10 15 20 25 30 35 40 45 50
INPUT VOLTAGE (V)
3632 G11
0
5
15
25
35
INPUT VOLTAGE (V)
Switch On-Resistance
vs Input Voltage
8
7
6
TOP
5
4
3
BOTTOM
2
Switch On-Resistance
vs Temperature
8
V_IN = 10V
7
6
TOP
5
4
BOTTOM
3
2
1
1
0
10
20
30
40
50
INPUT VOLTAGE (V)
3632 G14
0
–40 –10 20 50 80
TEMPERATURE (°C)
RUN Comparator Threshold
Voltage vs Temperature
1.30
1.25
RISING
1.20
1.15
FALLING
1.10
1.05
1.00
–40
–10 20 50 80
TEMPERATURE (°C)
110
3632 G17
Operating Waveforms
SWITCH
VOLTAGE
20V/DIV
OUTPUT
VOLTAGE
100mV/DIV
INDUCTOR
CURRENT
50mA/DIV
V_IN = 48V
V_OUT = 5V
I_LOAD = 10mA
20µs/DIV
45
3632 G12
110
3632 G15
3632 G18
3632fc
5