LTC3633 Datasheet, PDF (5/28 Pages) Linear Technology – Dual Channel 3A, 15V Monolithic Synchronous Step-Down Regulator

LTC3633
TYPICAL PERFORMANCE CHARACTERISTICS
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, V_IN = 12V, f_SW = 1MHz, L = 1μH unless
Efficiency vs Load Current
100
Burst Mode
90 OPERATION
80
80
70
70
60
60
50
50
80
FORCED
70
CONTINUOUS
OPERATION
60
50
40
40
40
30
30
30
20
10
0
1
V_IN = 4V
20
V_IN = 8V
V_IN = 12V
10
0
10
100
1000 10000
1
V_IN = 4V
V_IN = 8V
V_IN = 12V
10
100
1000 10000
20
10
0
1
V_OUT = 5V
V_OUT = 3.3V
10
100
1000 10000
LOAD CURRENT (mA)
LOAD CURRENT (mA)
LOAD CURRENT (mA)
3633 G01
3633 G02
3633 G03
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
10
0
0.1
V_IN = 4V
V_IN = 8V
V_IN = 12V
V_IN = 15V
1
10 100 1000 10000
LOAD CURRENT (mA)
3633 G04
Efficiency vs Input Voltage
Burst Mode Operation
100
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
INPUT VOLTAGE (V)
14 16
3633 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)
3633 G06
Load Regulation
1.6
Burst Mode OPERATION
FORCED CONTINUOUS
1.2
0.8
0.4
0.0
–0.4
0 0.5 1 1.5 2 2.5 3
I_LOAD (A)
3633 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)
3633 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)
3633 G09
3633f
5