LTC3415 Datasheet, PDF (4/28 Pages) Linear Technology – 7A, PolyPhase Synchronous Step-Down Regulator

LTC3415
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency and Power Loss vs
Load Current (3 Operating Modes)
(Reference Figure 13)
100
10
90
V_OUT = 1.8V
V_IN = 3.3V
80
1
70
60
50
0.1
40
30
20
10
0
0.001
% (Burst)
% (PSKIP)
% (FC)
W (Burst)
W (PSKIP)
W (FC)
0.01
0.001
0.01
0.1
1
10
LOAD CURRENT (A)
3415 G01
Supply Current vs V_IN
1.6
1.4
1.2
V_O = 1.2V PULSE SKIP
1.0
0.8
0.6
V_O = 1.2V BURST MODE
0.4
0.2
0
2.5
3 3.5 4 4.5
INPUT VOLTAGE (V)
5 5.5
3415 G03
R_DSON vs V_IN
40
35
PFET
30
25
NFET
20
15
10
5
0
2.25
3.25
4.25
INPUT VOLTAGE (V)
5.25
3415 G04
R_DSON vs Temperature
40
35
POWER PMOS
30
25
POWER NMOS
20
15
–100
–50
0
50 100 150
TEMPERATURE (°C)
3415 G05
Load Regulation
(Reference Figure 13)
0.5
FC MODE
0.4 _{VIN = 3.3V}
0.3 ^{VOUT = 1.8V}
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
01
23456
LOAD CURRENT (A)
78
3415 G06
Load Step
(Reference Figure 13)
V_OUT
(AC)
100mV/
DIV
I_L 5A/
DIV
I_OUT
5A/DIV
V_IN = 3.3V
V_OUT = 1.8V
40μs/DIV
FORCED CONTINUOUS
I_LOAD = 0.1A TO 5A
3415 G08
Oscillator Frequency
vs Temperature
2.0
1.8
1.6
1.4
1.2
1.0
–100
–50
0
50 100 150
TEMPERATURE (°C)
3415 G11
Efficiency and Power Loss vs Load
Current Force Continuous Mode
100
10
90 ^{VOUT = 1.8V}
80
70 _EFFICIENCY
1
60
50
40
30
POWER LOSS ^0.1
20
10
0
0.01
0.1
1
LOAD CURRENT (A)
2.5V
3.3V
5V _0.01
10
3415 G02
3415fa
4