LTC3565_15 Datasheet, PDF (4/22 Pages) Linear Technology – 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter

LTC3565
TYPICAL PERFORMANCE CHARACTERISTICS T_J = 25°C, V_IN = 3.6V, f_O = 1MHz, unless
otherwise noted.
Efficiency vs Input Voltage
100
I_OUT = 100mA I_OUT = 10mA
90
80
I_OUT = 1.25A
I_OUT = 1mA
70
60
50
I_OUT = 0.1mA
40
V_OUT = 1.8V
30
2.5 3.0 3.5 4.0 4.5
INPUT VOLTAGE(V)
5.0 5.5
3565 G01
Efficiency vs Output Current
100
Burst Mode
90 ^OPERATION
80
70
PULSE
SKIP
60
50
FORCED CONTINUOUS
40
30
20
10
0
0.1
V_OUT = 1.8V
1
10
100 1000 10000
OUTPUT CURRENT (mA)
3565 G04
Line Regulation
0.6
0.4
0.2
0.0
–0.2
–0.4
V_OUT = 1.8V
I_LOAD = 400mA
–0.6
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE(V)
3565 G07
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
10
V_OUT = 1.8V
0
0.1
1
10
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
100 1000 10000
OUTPUT CURRENT (mA)
3565 G02
Efficiency vs Output Current
100
90
80
70
60
50
40
30
20
10
V_OUT = 1.5V
0
0.1
1
10
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
100 1000 10000
OUTPUT CURRENT (mA)
3565 G03
Efficiency vs Frequency
95
4.7µH
94
93
2.2µH
92
91
90
1µH
89
V_OUT = 1.8V
88
0
1
2
3
4
5
FREQUENCY (MHz)
3565 G05
Reference Voltage vs
Temperature
615
Load Regulation
1.00
0.75
0.50
0.25
0.00
–0.25
–0.50
0
Burst Mode OPERATION
PULSE SKIP
FORCED CONTINUOUS
V_OUT = 1.8V
200 400 600 800 1000 1200 1400
OUTPUT CURRENT(mA)
3565 G06
Frequency Variation vs
Temperature
6
610
4
605
2
600
0
595
–2
590
–4
585
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3565 G08
–6
–50 –25
0 25 50 75
TEMPERATURE(°C)
100 125
3565 G09
3565fc
4
For more information www.linear.com/LTC3565