LTC3620 Datasheet, PDF (6/16 Pages) Linear Technology – Ultralow Power 15mA Synchronous Step-Down Switching Regulator

LTC3620
TYPICAL PERFORMANCE CHARACTERISTICS
NFET R_DS(ON) vs Temperature
1.5
I_SW = 35mA
1.4
1.3
1.2
1.1
V_IN = 3.6V
1.0
0.9
V_IN = 5V
0.8
0.7
0.6
0.5
–50
0
50
100 130
TEMPERATURE (°C)
3620 G19
Efficiency vs Load Current, V_OUT
100
90
80
70
60
50
40
30
20
10
0
0.1
T_A = 25°C
V_IN = 3V
FMIN/MODE = 0V
V_OUT = 1.1V
V_OUT = 1.8V
V_OUT = 2.5V
1
10
LOAD CURRENT (mA)
3620 G20
Efficiency vs Load Current,
FMIN/MODE Frequency
100
90
80
70
60
50
40
30
20
10
0
0.1
T_A = 25°C
V_IN = 3V
V_OUT = 1.1V
FMIN = 20kHz
FMIN = 100kHz
FMIN = 200kHz
1
LOAD CURRENT (mA)
10
3620 G21
Efficiency vs Load Current, V_IN
100
90
80
70
60
50
40
30
20
10
0
0.1
T_A = 25°C
V_OUT = 1.1V
FMIN/MODE = V_IN
V_IN = 3V
V_IN = 3.6V
V_IN = 5.5V
1
LOAD CURRENT (mA)
10
3620 G22
Efficiency vs f_MIN, 1mA Load
81
80
79
78
77
76
75
74
73 ^{TA = 25°C}
V_IN = 3.6V
72 V_OUT = 1.1V
FMIN/MODE = EXTERNAL CLOCK
71
0
100
200
f_MIN (kHz)
300
3620 G23
Internal f_MIN vs Temperature
55
54
53
52
51
V_IN = 3.6V
50
49
V_IN = 5V
48
47
46
45
–50
0
50
100
TEMPERATURE (°C)
3620 G24
Spectral Content, 500μA Load
–60
–80
52.5kHz
–81.4dBm
–100
–120
Spectral Content, 5mA Load
–40
–60
–80
–100
355.6kHz
–80.2dBm
–140
12.5kHz
–160
V_OUT = 1.1V
8kHz/DIV
V_IN = 3.6V
FMIN/MODE = 0V
T_A = 25°C
92.5kHz
3620 G25
–120
1kHz
–140
V_OUT = 1.1V 39.9kHz/DIV
V_IN = 3.6V
FMIN/MODE = 0V
T_A = 25°C
400kHz
3620 G26
3620f
6