LTC3405A-1.8_15 Datasheet, PDF (3/16 Pages) Linear Technology – 1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT

LTC3405A-1.5/LTC3405A-1.8
TYPICAL PERFOR A CE CHARACTERISTICS
(From Figure1a)
Efficiency vs Input Voltage
95
90
I_OUT = 100mA
85 _{IOUT = 250mA}
80
I_OUT = 10mA
I_OUT = 1mA
75
70
65
60
I_OUT = 0.1mA
55 Burst Mode OPERATION
V_OUT = 1.8V
50
2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3405A1518 G02
Efficiency vs Output Current
100
V_OUT = 1.5V
90
V_IN = 2.7V
V_IN = 3.6V
80
V_IN = 4.2V
70
60
50
40
0.1
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1518 G05
Efficiency vs Output Current
100
90 _{VIN = 3.6V}
80
V_IN = 4.2V
70
60
V_IN = 3.6V
50
40
V_IN = 4.2V
30
20
10
0
0.1
PULSE SKIPPING MODE
Burst Mode OPERATION
V_OUT = 1.8V
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1518 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
3405A1518 G07
Efficiency vs Output Current
100
V_IN = 2.7V
90
80
V_IN = 3.6V
V_IN = 4.2V
70
V_IN = 5.5V
60
50
40
0.1
V_OUT = 1.8V
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1518 G04
Oscillator Frequency vs
Supply Voltage
1.8
1.7
1.6
1.5
1.4
1.3
1.2
2
3
4
5
6
SUPPLY VOLTAGE (V)
3405A1518 G08
Output Voltage vs Load Current
1.834
1.824
1.814
1.804
Burst Mode
OPERATION
1.794
1.784
PULSE SKIPPING MODE
1.774
0
100 200 300 400 500 600
LOAD CURRENT (mA)
3405A1518 G09
R_DS(ON) vs Input Voltage
1.2
1.1
1.0
0.9
MAIN SWITCH
0.8
0.7
0.6
0.5
SYNCHRONOUS
SWITCH
0.4
0.3
0.2
0.1
0
01 23 4 567
INPUT VOLTAGE (V)
3405A1518 G10
R_DS(ON) vs Temperature
1.2
V_IN = 4.2V
1.0 _{VIN = 2.7V} V_IN = 3.6V
0.8
0.6
0.4
0.2
0
–50 –25
SYNCHRONOUS SWITCH
MAIN SWITCH
0 25 50 75 100 125
TEMPERATURE (°C)
3405F G11
3405a1518fa
3