LTC3405A-1.375_15 Datasheet, PDF (3/12 Pages) Linear Technology – 1.375V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT

LTC3405A-1.375
TYPICAL PERFOR A CE CHARACTERISTICS T_A = 25°C unless otherwise noted.
(From Figure1a)
Efficiency vs Input Voltage
90
80
70
I_OUT = 0.1mA
I_OUT = 1mA
I_OUT = 10mA
60
I_OUT = 100mA
I_OUT = 250mA
50
40 ^{Burst Mode OPERATION}
30
2.5
3.0 3.5 4.0 4.5 5.0 5.5
LOAD CURRENT (mA)
3405A1375 G01
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
3405A1375 G04
Efficiency vs Output Current
100
Burst Mode OPERATION
90
80
70
60
PULSE SKIPPING MODE
50
40
30
20
10
0
0.1
3.6V
4.2V
3.6V
4.2V
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1375 G02
Oscillator Frequency vs
Supply Voltage
1.8
Efficiency vs Output Current
100
90
80
70
60
50
40
30
0.1
V_IN = 2.7V
V_IN = 3.6V
V_IN = 4.2V
V_IN = 5.5V
1
10
100
OUTPUT CURRENT (mA)
1000
3405A1375 G03
Output Voltage vs Load Current
1.395
1.7
1.385
Burst Mode
1.6
OPERATION
1.375
PULSE SKIPPING MODE
1.5
1.365
1.4
1.355
1.3
1.2
2
3
4
5
6
SUPPLY VOLTAGE (V)
3405A1375 G05
1.345
0
100 200 300 400 500
CURRENT LOAD (mA)
3405A1375 G06
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)
3405A1375 G07
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)
3405A1375 G08
3405a1375f
3