ltc3405a Linear Technology Corporation, ltc3405a Datasheet - Page 4

• Manufacturer Part Number: ltc3405a
• Description: 1.5mhz, 300ma Synchronous Step-down Regulator In Thinsot
• Manufacturer: Linear Technology Corporation

LTC3405A
(From Figure 1a Except for the Resistive Divider Resistor Values)
100mA/DIV
TYPICAL PERFOR A CE CHARACTERISTICS
4
10mV/DIV
COUPLED
160
140
120
100
5V/DIV
1.2
1.0
0.8
0.6
0.4
0.2
80
60
40
20
V
0
0
–50
–50
OUT
SW
AC
Switch Leakage vs Temperature
I
R
V
V
RUN = 0V
L
IN
IN
DS(ON)
Pulse Skipping Mode Operation
V
V
I
–25
–25
LOAD =
= 2.7V
IN
OUT
= 5.5V
= 3.6V
= 1.8V
20mA
vs Temperature
0
0
TEMPERATURE (°C)
TEMPERATURE (°C)
V
IN
MAIN SWITCH
= 3.6V
25
25
SYNCHRONOUS SWITCH
MAIN SWITCH
500ns/DIV
SYNCHRONOUS
V
50
50
IN
SWITCH
= 4.2V
75
75
W
100
100
3405A G11
3405A G14
U
3405A G17
125
125
200mA/DIV
1600
1400
1200
1000
2V/DIV
1V/DIV
800
600
400
200
V
RUN
60
50
40
30
20
10
OUT
0
0
I
2
Dynamic Supply Current
Switch Leakage vs Input Voltage
L
0
RUN = 0V
Start-Up from Shutdown
V
V
I
LOAD =
IN
OUT
= 3.6V
1
= 1.8V
Burst Mode OPERATION
250mA
3
SUPPLY VOLTAGE (V)
PULSE SKIPPING MODE
SYNCHRONOUS
INPUT VOLTAGE (V)
MAIN SWITCH
2
SWITCH
100µs/DIV
4
3
4
V
I
LOAD
OUT
5
= 1.8V
5
3405A G12
= 0A
3405A G15
3405A G18
6
6
AC COUPLED
100mV/DIV
100mA/DIV
100mV/DIV
200mA/DIV
200mA/DIV
COUPLED
5V/DIV
V
I
V
600
500
400
300
200
100
LOAD
OUT
SW
OUT
I
AC
0
L
I
–50
L
Burst Mode Operation
Dynamic Supply Current
vs Temperature
V
V
I
Load Step
LOAD =
V
V
I
PULSE SKIPPING MODE
V
V
I
IN
OUT
LOAD =
LOAD
IN
OUT
IN
OUT
= 3.6V
–25
= 3.6V
= 3.6V
= 1.8V
= 1.8V
= 1.8V
= 0A
20mA
0mA TO 250mA
0
TEMPERATURE (°C)
Burst Mode OPERATION
25
5µs/DIV
40µs/DIV
PULSE SKIPPING MODE
50
75
100
3405A G16
3405A G13
3405A G19
3405afa
125