LTC3633A-3_15 Datasheet, PDF (5/28 Pages) Linear Technology – Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator

LTC3633A-2/LTC3633A-3
TYPICAL PERFORMANCE CHARACTERISTICS
L = 1µH unless otherwise noted.
Efficiency vs Load Current
Efficiency vs Load Current
Forced Continuous Mode
Burst Mode Operation
Operation
100
V_OUT = 1.8V
90
100
V_OUT = 1.8V
90
T_J = 25°C, PV_IN1 = PV_IN2 = SV_IN = 12V, f_SW = 1MHz,
Efficiency vs Load Current
100 _{Burst Mode OPERATION}
90
80
80
80
FORCED
70
70
70
CONTINUOUS
OPERATION
60
60
60
50
50
50
40
30
20
10
0
0.001
V_IN = 4V
V_IN = 8V
V_IN = 12V
V_IN = 20V
0.01
0.1
1
10
LOAD CURRENT (A)
40
30
20
10
0
0.001
V_IN = 4V
V_IN = 8V
V_IN = 12V
V_IN = 20V
0.01
0.1
1
10
LOAD CURRENT (A)
40
30
20
10
0
0.001
L = 2.2µH
V_OUT = 5V
V_OUT = 3.3V
V_OUT = 5V
V_OUT = 3.3V
0.01
0.1
1
10
LOAD CURRENT (A)
3633a23 G01
3633a23 G02
3633a23 G03
Efficiency vs Load Current
Burst Mode Operation
100
V_OUT = 1.2V
90
80
70
60
50
40
30
20
10
0
0.0001
0.001 0.01 0.1
LOAD CURRENT (A)
V_IN = 4V
V_IN = 8V
V_IN = 12V
V_IN =15V
V_IN = 20V
1
10
3633a23 G04
Efficiency vs Input Voltage
Burst Mode Operation
100
V_OUT = 1.8V
95
90
85
80
75
70
65
60
4
I_LOAD = 10mA
I_LOAD = 100mA
I_LOAD = 1A
I_LOAD = 3A
6 8 10 12 14 16 18 20
INPUT VOLTAGE (V)
3633a23 G05
Reference Voltage
vs Temperature
0.605
0.603
0.601
0.599
0.597
0.595
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3633a23 G06
Load Regulation
1.6
Burst Mode OPERATION
FORCED CONTINUOUS
1.2
V_OUT = 1.8V
0.8
0.4
0.0
–0.4
0 0.5 1 1.5 2 2.5 3
I_LOAD (A)
3633a23 G07
Oscillator Frequency
vs Temperature
10
8
6
4
2
0
–2
–4
–6
–8
–10
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3633a23 G08
Oscillator Internal Set Frequency
vs Temperature
2.6
R_T = INTV_CC
2.4
2.2
2.0
1.8
1.6
1.4
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3633a23 G09
For more information www.linear.com/LTC3633A-2
3633a23fb
5