LTC3548EDD Datasheet, PDF (4/16 Pages) Linear Technology – Dual Synchronous, 400mA/800mA, 2.25MHz

LTC3548
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Efficiency vs Input Voltage
100
95
90
85 _1mA
100mA
10mA
80 _800mA
75
70
65
V_OUT = 1.8V, CHANNEL 1
Burst Mode OPERATION
CIRCUIT OF FIGURE 3
60
2
3
4
5
INPUT VOLTAGE (V)
6
3548 G04
Oscillator Frequency
vs Temperature
2.5
V_IN = 3.6V
2.4
2.3
2.2
2.1
2.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3548 G05
Oscillator Frequency
vs Supply Voltage
10
8
6
4
2
0
–2
–4
–6
–8
–10
2
3
4
5
SUPPLY VOLTAGE (V)
6
3548 G06
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
3548 G07
R_DS(ON) vs Input Voltage
500
T_A = 25°C
450
400
MAIN
SWITCH
350
300
SYNCHRONOUS
250
SWITCH
200
1
2
3
4
5
6
7
V_IN (V)
3548 G08
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
Efficiency vs Load Current
100
95
90 Burst Mode OPERATION
85
80
75
PULSE-SKIPPING MODE
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
4
Load Regulation
2.0
1.5
Burst Mode OPERATION
1.0
0.5
0
PULSE-SKIPPING 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
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
3548fc