LTC3407A-2 Datasheet, PDF (5/16 Pages) Linear Technology – Dual Synchronous 800mA,2.25MHz Step-Down DC/DC Regulator

LTC3407A-2
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Reference Voltage vs
Temperature
0.615
V_IN = 3.6V
0.610
0.605
0.600
0.595
0.590
0.585
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3407A2 G07
R_DS(ON) vs Input Voltage
500
450
400
MAIN
SWITCH
350
300
SYNCHRONOUS
250
SWITCH
200
12
3
4
5
V_IN (V)
6
7
3407A2 G08
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
MAIN SWITCH
100
SYNCHRONOUS SWITCH
–50 –25 0 25 50 75 100 125 150
TEMPERATURE (°C)
3407A2 G09
Efficiency vs Load Current
100
90 ^2.7V
80
4.2V
3.3V
70
60
50
40
30
20
10 V_OUT = 2.5V Burst Mode OPERATION
0 ^{CIRCUIT OF FIGURE 3}
1
10
100
LOAD CURRENT (mA)
1000
3407A2 G10
Efficiency vs Load Current
100
90 ^{Burst Mode OPERATION}
80
70
60
PULSE SKIP MODE
50
40
30
20
10 ^VIN ^{= 3.6V, V}OUT ^{= 1.8V}
NO LOAD ON OTHER CHANNEL
0
1
10
100
LOAD CURRENT (mA)
1000
3407A2 G11
Load Regulation
4
3
2
1 ^{Burst Mode OPERATION}
0
PULSE SKIP MODE
–1
–2
–3 _{VIN = 3.6V, VOUT = 1.8V}
NO LOAD ON OTHER CHANNEL
–4
1
10
100
LOAD CURRENT (mA)
1000
3407A2 G12
Efficiency vs Load Current
100
3.3V
90
2.7V
80
4.2V
70
60
50
40
30
20
10
V_OUT = 1.2V Burst Mode OPERATION
0
1
10
100
LOAD CURRENT (mA)
1000
3407A2 G13
Efficiency vs Load Current
100
90
3.3V
2.7V
80
70 ^4.2V
60
50
40
30
20
10
V_OUT = 1.5V Burst Mode OPERATION
0
1
10
100
LOAD CURRENT (mA)
1000
3407A2 G14
Line Regulation
0.5
0.4
V_OUT = 1.8V
I_OUT = 200mA
0.3
0.2
0.1
0
–0.1
–0.2
–0.3
–0.4
–0.5
2
3
4
V_IN (V)
5
6
3407A2 G15
3407a2f
5