LTC3632_15 Datasheet, PDF (4/22 Pages) Linear Technology – High Efficiency, High Voltage 20mA Synchronous Step-Down Converter

LTC3632
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C, unless otherwise noted.
Efficiency vs Load Current,
V_OUT = 5V
100
95
V_IN = 24V
V_IN = 12V
90
85
80
75
V_IN = 48V
V_IN = 36V
70
65
60
55
50
0.1
V_OUT = 5V
FIGURE 11 CIRCUIT
1
LOAD CURRENT (mA)
10
3632 G01
Efficiency vs Input Voltage
100
V_OUT = 5V
FIGURE 11 CIRCUIT
95
90
I_LOAD = 20mA
85
80
I_LOAD = 1mA
I_LOAD = 5mA
75
70
10
15 20 25 30 35 40
INPUT VOLTAGE (V)
45 50
3632 G04
Feedback Comparator Trip
Voltage vs Temperature
0.801
V_IN = 10V
0.800
0.799
0.798
–40
–10 20 50 80
TEMPERATURE (°C)
110
3632 G07
Efficiency vs Load Current,
V_OUT = 3.3V
100
95
90
V_IN = 12V
V_IN = 24V
85
80
75
V_IN = 48V
70
65
V_IN = 36V
60
55
50
0.1
V_OUT = 3.3V
FIGURE 11 CIRCUIT
1
LOAD CURRENT (mA)
10
3632 G02
Line Regulation
0.50
0.40
I_LOAD = 20mA
FIGURE 11 CIRCUIT
0.30
0.20
0.10
0
–0.10
–0.20
–0.30
–0.40
–0.50
5 10 15 20 25 30 35 40 45 50
INPUT VOLTAGE (V)
3632 G05
Feedback Comparator Hysteresis
Voltage vs Temperature
5.6
V_IN = 10V
5.4
5.2
5.0
4.8
4.6
4.4
–40
–10 20 50 80
TEMPERATURE (°C)
110
3632 G08
Efficiency vs Load Current,
V_OUT = 2.5V
100
95
90
V_IN = 12V
85
V_IN = 24V
80
75
70
65
60
55
50
0.1
V_IN = 48V
V_IN = 36V
V_OUT = 2.5V
FIGURE 11 CIRCUIT
1
LOAD CURRENT (mA)
10
3632 G03
Load Regulation
5.05
5.04
V_IN = 10V
V_OUT = 5V
5.03 ^{FIGURE 11 CIRCUIT}
5.02
5.01
5.00
4.99
4.98
4.97
4.96
4.95
0
5
10
15
LOAD CURRENT (mA)
20
3632 G06
Peak Current Trip Threshold
vs Temperature and I_SET
60
V_IN = 10V
50
I_SET OPEN
40
30
R_ISET = 500k
20
10
I_SET = GND
0
–40 –10 20 50 80
TEMPERATURE (°C)
110
3632 G09
3632fc
4