LTC3548A Datasheet, PDF (5/20 Pages) Linear Technology – Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator

LTC3548A
TYPICAL PERFORMANCE 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
3548A G08
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
3548A G09
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
3548A G10
Efficiency vs Load Current
100
90 ^2.7V
80
4.2V
3.3V
70
60
50
40
30
20 _{VOUT = 2.5V}
10
Burst Mode OPERATION
FIGURE 3 CIRCUIT
0
1
10
100
LOAD CURRENT (mA)
1000
3548A G11
Efficiency vs Load Current
100
90 ^{Burst Mode OPERATION}
80
70
60
PULSE-SKIPPING MODE
50
40
30
20 _{VIN = 3.6V}
10 ^VOUT ^{= 1.8V}
NO LOAD ON OTHER CHANNEL
0
1
10
100
LOAD CURRENT (mA)
1000
3548A G12
Load Regulation
4
3
2
1 ^{Burst Mode OPERATION}
0 _{PULSE-SKIPPING MODE}
–1
–2
V_IN = 3.6V
–3 _{VOUT = 1.8V}
NO LOAD ON OTHER CHANNEL
–4
1
10
100
LOAD CURRENT (mA)
1000
3548A G13
Efficiency vs Load Current
100
3.3V
90
2.7V
80
4.2V
70
60
50
40
30
20
10 ^VOUT ^{= 1.2V}
Burst Mode OPERATION
0
1
10
100
LOAD CURRENT (mA)
1000
3548A G14
Efficiency vs Load Current
100
90
3.3V
2.7V
80
4.2V
70
60
50
40
30
20
10 ^VOUT ^{= 1.5V}
Burst Mode OPERATION
0
1
10
100
LOAD CURRENT (mA)
1000
3548A G15
Line Regulation
0.5
V_OUT = 1.8V
0.4 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
3548A G16
3548af
5