LTC3548 Datasheet, PDF (4/16 Pages) Linear Technology – Dual Synchronous, 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548
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
3548 G07
200
12
3
4
5
V_IN (V)
6
7
3548 G08
Efficiency vs Load Current
100
95
90 Burst Mode OPERATION
85
80
PULSE SKIP MODE
75
70
65
60
1
V_IN = 3.6V, V_OUT = 1.8V
NO LOAD ON OTHER CHANNEL
CHANNEL 1; CIRCUIT OF FIGURE 3
10
100
LOAD CURRENT (mA)
1000
3548 G11
Load Regulation
2.0
1.5
Burst Mode OPERATION
1.0
0.5
0
PULSE SKIP MODE
–0.5
–1.0
–1.5
–2.0
1
V_IN = 3.6V, V_OUT = 1.8V
NO LOAD ON OTHER CHANNEL
CHANNEL 1; CIRCUIT OF FIGURE 3
10
100
LOAD CURRENT (mA)
1000
3548 G12
Efficiency vs Load Current
100
2.7V
3.6V
90
4.2V
80
70
60
V_OUT = 2.5V, CHANNEL 1
50 Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
CIRCUIT OF FIGURE 3
40
1
10
100
LOAD CURRENT (mA)
1000
3548 G10
Efficiency vs Load Current
100
95
90 _2.7V
85
80
3.6V
4.2V
75
70 _{VOUT = 1.5V, CHANNEL 1}
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60 ^{CIRCUIT OF FIGURE 3}
1
10
100
LOAD CURRENT (mA)
1000
3548 G14
R_DS(ON) vs Junction 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
JUNCTION TEMPERATURE (°C)
3548 G09
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
3548 G15
Efficiency vs Load Current
100
95
90
85
2.7V
80
4.2V
75
70 _{VOUT = 1.2V, CHANNEL 1}
65
Burst Mode OPERATION
NO LOAD ON OTHER CHANNEL
60 ^{CIRCUIT OF FIGURE 3}
1
10
100
LOAD CURRENT (mA)
3.6V
1000
3548 G13
3548f
4