LTC3448_15 Datasheet, PDF (4/20 Pages) Linear Technology – 1.5MHz/2.25MHz, 600mA Synchronous Step-Down Regulator with LDO Mode

LTC3448
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure1a Except for the Resistive Divider Resistor Values)
Efficiency vs Input Voltage
100
95
I_OUT = 100mA
V_OUT = 1.8V
T_A = 25°C
90
85 ^IOUT ^{= 30mA}
80
I_OUT = 600mA
75
70
65
60
55
50
2
3
4
5
6
INPUT VOLTAGE (V)
3448 G01
Efficiency vs Load Current
(Switcher Only)
100
V_IN = 2.7V
90 _{VOUT = 2.5V}
80 ^{TA = 25°C}
70
60
50
40
30
20
10
0
0.0001
0.001
0.01
0.1
LOAD CURRENT (A)
1
23448 G04
Oscillator Frequency
vs Supply Voltage
1.8
T_A = 25°C
1.7
1.6
1.5
1.4
1.3
1.2
2
3
4
5
SUPPLY VOLTAGE (V)
6
3448 G07
4
Efficiency vs Load Current
100
V_OUT = 1.2V
90 _{TA = 25°C}
80
70
60
50
40
30
20
10
0
0.0001
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
0.001
0.01
0.1
1
LOAD CURRENT (A)
23448 G02
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
3448 G05
Output Voltage vs Load Current
1.525
V_IN = 3.6V
1.520 T_A = 25°C
1.515
1.510
1.505
1.500
1.495
1.490
1.485
1.480
1.475
0.0001 0.001
0.01
0.1
1
LOAD CURRENT (A)
3448 G08
Efficiency vs Load Current
100
V_OUT = 1.5V
90 _{TA = 25°C}
80
70
60
50
40
30
20
10
0
0.0001
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
0.001
0.01
0.1
1
LOAD CURRENT (A)
23448 G03
Oscillator Frequency
vs Temperature
1.70
V_IN = 3.6V
1.65
1.60
1.55
1.50
1.45
1.40
1.35
1.30
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3448 G06
R_DS(ON) vs Input Voltage
0.40
0.38
T_A = 25°C
0.36
0.34
MAIN
SWITCH
0.32
0.30
SYNCHRONOUS
0.28
SWITCH
0.26
0.24
0.22
0.20
2
3
4
5
6
INPUT VOLTAGE (V)
3448 G09
3448f