LTC3407-2 Datasheet, PDF (4/16 Pages) Linear Technology – Dual Synchronous, 800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3407-2
TYPICAL PERFOR A CE CHARACTERISTICS
Reference Voltage vs
Temperature
0.615
V_IN = 3.6V
0.610
R_DS(ON) vs Input Voltage
500
T_A = 25°C
450
0.605
0.600
400
MAIN
SWITCH
350
0.595
0.590
300
SYNCHRONOUS
250
SWITCH
0.585
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3407 G07
200
12
3
4
5
6
7
V_IN (V)
3407 G08
Efficiency vs Load Current
100
2.7V
95
3.6V
90
4.2V
85
80
75
70 _{VOUT = 2.5V}
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
CIRCUIT OF FIGURE 1
60
1
10
100
LOAD CURRENT (mA)
1000
3407 G10
Efficiency vs Load Current
100
95
90
3.6V
85
2.7V
80
4.2V
75
70 _{VOUT = 1.2V}
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60 ^{CIRCUIT OF FIGURE 1}
1
10
100
LOAD CURRENT (mA)
1000
3407 G13
Efficiency vs Load Current
100
95
Burst Mode OPERATION
90
85
80
75
PULSE SKIP MODE
70
65
60
1
V_IN = 3.6V, V_OUT = 1.8V
NO LOAD ON OTHER CHANNEL
10
100
1000
LOAD CURRENT (mA)
3407 G11
Efficiency vs Load Current
100
95
90 _2.7V
85
3.6V
4.2V
80
75
70 _{VOUT = 1.5V}
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60 ^{CIRCUIT OF FIGURE 1}
1
10
100
LOAD CURRENT (mA)
1000
3407 G14
R_DS(ON) vs Temperature
550
V_IN = 2.7V
500
450
V_IN = 4.2V ^{VIN = 3.6V}
400
350
300
250
200
150
100
–50
MAIN SWITCH
SYNCHRONOUS SWITCH
–25 0 25 50 75 100
TEMPERATURE (°C)
125 150
3407 G09
Load Regulation
4
3
Burst Mode OPERATION
2
1
0
PULSE SKIP MODE
–1
–2
–3
–4
1
V_IN = 3.6V, V_OUT = 1.8V
NO LOAD ON OTHER CHANNEL
10
100
LOAD CURRENT (mA)
1000
3407 G12
Line Regulation
0.5
0.4
V_OUT = 1.8V
I_OUT = 200mA
0.3 ^{TA = 25°C}
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
2
3
4
V_IN (V)
5
6
3407 G15
4
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