LTC3548-1 Datasheet, PDF (4/16 Pages) Linear Technology – Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator

LTC3548-1
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise specified.
Efficiency vs Input Voltage
100
95
I_OUT = 100mA
90
85
80 _{IOUT = 800mA}
75
70
I_OUT = 10mA
I_OUT = 1mA
65
60
2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
3548-1 G04
Output Voltage Error
vs Temperature
1
V_IN = 3.6V
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3548-1 G07
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
3548-1 G05
R_DS(ON) vs Input Voltage
500
450
400
MAIN
SWITCH
350
300
SYNCHRONOUS
250
SWITCH
200
1
2
3
4
5
6
7
INPUT VOLTAGE (V)
3548-1 G08
Oscillator Frequency
vs Input Voltage
10
8
6
4
2
0
–2
–4
–6
–8
–10
2
3
4
5
INPUT VOLTAGE (V)
6
3548-1 G06
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
SYNCHRONOUS SWITCH
100
–50 –25 0 25 50 75 100 125 150
JUNCTION TEMPERATURE (°C)
3548-1 G09
Efficiency vs Load Current
100
95
90
V_OUT1 = 1.8V
85
V_OUT2 = 1.575V
80
75
70
65
60
1
10
100
LOAD CURRENT (mA)
1000
3548-1 G11
4
Load Regulation
2.0
1.5
1.0
V_OUT1 = 1.8V
0.5
0
V_OUT2 = 1.575V
–0.5
–1.0
–1.5
–2.0
1
10
100
LOAD CURRENT (mA)
1000
3548-1 G12
Line Regulation
0.5
0.4
0.3
V_OUT1 = 1.8V
0.2
0.1
V_OUT2 = 1.575V
0
–0.1
–0.2
–0.3
–0.4
–0.5
2.5 3 3.5 4 4.5 5 5.5
LOAD CURRENT (mA)
3548-1 G15
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