Datasheet

LTC3542
4
3542fa
Start-Up from Shutdown Load Step
Reference Voltage
vs Temperature
Oscillator Frequency
vs Temperature
Oscillator Frequency
vs Supply Voltage
Output Voltage vs Supply Voltage
Output Voltage vs Load Current
R
DS(ON)
vs Input Voltage
RUN
2V/DIV
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 500mA
FIGURE 3a CIRCUIT
400μs/DIV
3542 G04
V
OUT
1V/DIV
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 30mA TO 500mA
FIGURE 3a CIRCUIT
20μs/DIV
3542 G05
I
LOAD
500mA/DIV
Load Step
V
OUT
100mV/DIV
AC COUPLED
I
L
500mA/DIV
V
IN
= 3.6V
V
OUT
= 1.8V
I
LOAD
= 0mA TO 500mA
FIGURE 3a CIRCUIT
20μs/DIV
3542 G06
I
LOAD
500mA/DIV
TEMPERATURE (°C)
–50
V
REF
(V)
0.6100
0.6075
0.6050
0.6025
0.6000
0.5975
0.5950
0.5925
0.5900
0.5875
0.5850
0.5825
0.6125
0.6150
0
50
75
3542 G07
–25
25
100
125
INPUT VOLTAGE (V)
2
–0.5
V
OUT
ERROR (%)
–0.4
–0.2
–0.1
0
0.5
0.2
3
4
4.5
3542 G10
–0.3
0.3
0.4
0.1
2.5 3.5
5
5.5
6
V
OUT
= 1.8V
I
OUT
= 100mA
LOAD CURRENT (mA)
1
0
V
OUT
ERROR (%)
1.0
2.0
10 100 1000
3542 G11
–1.0
–0.5
0.5
1.5
–1.5
–2.0
Burst Mode
OPERATION
V
IN
= 3.6V
V
OUT
= 1.8V
PULSE SKIP
MODE
V
IN
(V)
1
0
R
DS(ON)
( )
0.1
0.3
0.4
0.5
5
0.9
3542 G12
0.2
32647
0.6
0.7
0.8
SYNCHRONOUS
SWITCH
MAIN SWITCH
TEMPERATURE (°C)
–50 –30 –10 10 30 50 70 90 110
1.8
FREQUENCY (MHz)
1.9
2.1
2.2
2.3
2.7
3542 G08
2.0
2.4
2.5
2.6
SUPPLY VOLTAGE (V)
FREQUENCY (MHz)
2.2
2.3
2.4
56
3542 G09
2.1
2.0
1.8
2
3
4
1.9
2.7
2.5
2.6
TYPICAL PERFORMANCE CHARACTERISTICS
T
A
= 25°C unless otherwise specifi ed.