LTC3633A-2 Datasheet, PDF (6/28 Pages) Linear Technology – Dual Channel 3A, 20V Monolithic Synchronous Step-Down Regulator

LTC3633A-2/LTC3633A-3
TYPICAL PERFORMANCE CHARACTERISTICS T_J = 25°C, PV_IN1 = PV_IN2 = SV_IN = 12V, f_SW = 1MHz,
L = 1μH unless otherwise noted.
Internal MOSFET R_DS(ON)
vs Temperature
200
180
160
140
120
TOP SWITCH
100
80
60
BOTTOM SWITCH
40
20
0
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3633a23 G10
Quiescent Current vs V_IN
Burst Mode Operation
900
800
700
90°C
600
25°C
500
–40°C
400
300
200
100
0
4 6 8 10 12 14 16 18 20
V_IN (V)
3633a23 G11
Shutdown Current vs V_IN
24
22
20
18
16
14
12
10
8
6
4
2
0
4 6 8 10 12 14 16
V_IN (V)
18 20
3633a G12
Switch Leakage vs Temperature
10000
9000
SYNCHRONOUS SWITCH
MAIN SWITCH
8000
7000
6000
5000
4000
3000
2000
1000
0
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3633a23 G13
Valley Current Limit
vs Temperature
3.9
3.8
3.7
3.6
3.5
3.4
3.3
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3633a23 G14
TRACKSS Pull-Up Current
vs Temperature
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3633a23 G15
Burst Mode Operation
SW
10V/DIV
V_OUT
50mV/DIV
I_L
1A/DIV
V_OUT = 1.8V
I_LOAD = 100mA
5μs/DIV
3633a23 G17
Load Step
V_OUT
AC-COUPLED
100mV/DIV
I_L
2A/DIV
20μs/DIV
V_OUT = 1.8V
I_LOAD = 100mA to 3A
C_ITH = 220pF
R_ITH = 13kΩ
3633a23 G18
3633a23f
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