LTC3417_15 Datasheet, PDF (5/20 Pages) Linear Technology – Dual Synchronous 1.4A/800mA 4MHz Step-Down DC/DC Regulator

TYPICAL PERFORMANCE CHARACTERISTICS
LTC3417
OUT2 Efficiency vs V_IN
(Pulse Skipping Mode)
100
I_LOAD = 250mA
95
90
I_LOAD = 800mA
Load Step OUT1
V_OUT1
100mV/DIV
85
I_OUT1
500mA/DIV
80
75
V_OUT = 2.5V
REFER TO FIGURE 4
70
2 2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3417 G10
V_IN = 3.6V
100μs/DIV
V_OUT = 1.8V
I_LOAD = 0.25A to 1.4A
REFER TO FIGURE 4
Load Step OUT2
V_OUT2
100mV/DIV
I_OUT2
500mA/DIV
3417 G11
V_IN = 3.6V
100μs/DIV
V_OUT = 2.5V
I_LOAD = 0.25A to 0.8A
REFER TO FIGURE 4
3417 G12
Efficiency vs Frequency OUT1
94
T_A = 27°C
V_IN = 3.6V
92
V_OUT = 1.8V
I_OUT = 300mA
90
88
86
84
82
0
1
2
3
4
5
FREQUENCY (MHz)
3417 G13
R_DS(ON) vs V_IN OUT2
0.20
0.19
P-CHANNEL SWITCH
0.18
T_A = 27°C
0.17
0.16
0.15
N-CHANNEL SWITCH
0.14
2 2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3417 G16
Efficiency vs Frequency OUT2
90
85
80
75
70
65
60
0
T_A = 27°C
V_IN = 3.6V
V_OUT = 2.5V
I_OUT = 100mA
1
2
3
4
FREQUENCY (MHz)
3417 G14
R_DS(ON) vs V_IN OUT1
0.105
0.100
0.095
P-CHANNEL SWITCH
T_{A =} 27°C
0.090
0.085
N-CHANNEL SWITCH
0.080
2 2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3417 G15
Frequency vs V_IN
6
4
2 _{FREQ = 143k TO GROUND}
0
–2
–4
FREQ = V_IN
–6
–8
–10
2 2.5 3 3.5 4 4.5 5 5.5
V_IN (V)
3417 G17
Frequency vs Temperature
15
10
FREQ = V_IN
5
0
FREQ = 143k TO GROUND
–5
–10
–15
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3417 G18
3417fd
5