LTC3405A-1.8_15 Datasheet, PDF (4/16 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 Figure 1a)
Dynamic Supply Current
vs Supply Voltage
1800
1600
V_OUT = 1.8V
I_LOAD = 0A
1400
1200
1000
800
600
400
200
0
2
PULSE SKIPPING MODE
BURST MODE OPERATION
2.5 3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)
3405A1518 G12
Dynamic Supply Current
vs Temperature
340
V_IN = 3.6V
300 ^VOUT ^{= 1.8V}
I_LOAD = 0A
260
PULSE SKIPPING MODE
220
180
140
100
60
BURST MODE OPERATION
20
0
–50 –25 0 25 50 75
TEMPERATURE (°C)
100 125
3405A1518 G13
Switch Leakage vs Temperature
160
V_IN = 5.5V
140 ^{RUN = 0V}
120
100
80
60
SYNCHRONOUS
40
SWITCH
20
MAIN SWITCH
0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3405F G14
Switch Leakage vs Input Voltage
60
RUN = 0V
50
SYNCHRONOUS
SWITCH
40
30
Burst Mode Operation
SW
5V/DIV
V_OUT
100mV/DIV
AC COUPLED
20
MAIN SWITCH
10
I_L
100mA/DIV
Pulse Skipping Mode Operation
SW
5V/DIV
V_OUT
10mV/DIV
AC
COUPLED
I_L
100mA/DIV
0
0
1
2
3
4
56
INPUT VOLTAGE (V)
3405F G15
Start-Up from Shutdown
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 20mA
5µs/DIV
3405A1518 G16
Load Step
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 20mA
500ns/DIV
3405A1518 G17
RUN
2V/DIV
V_OUT
1V/DIV
V_OUT
100mV/DIV
AC
COUPLED
I_L
200mA/DIV
I_L
200mA/DIV
I_LOAD
200mA/DIV
4
V_IN = 3.6V
V_OUT = 1.8V
I_LOAD = 250mA
100µs/DIV
3405A1518 G18
V_IN = 3.6V
40µs/DIV
V_OUT = 1.8V
I_LOAD = 0mA TO 250mA
PULSE SKIPPING MODE
3405A1518 G19
3405a1518fa