Datasheet

MAX618
28V, PWM, Step-Up DC-DC Converter
4 _______________________________________________________________________________________
0
V
OUT
(100mV/div)
V
LX
(10V/div)
I
L
(1A/div)
MEDIUM-LOAD SWITCHING
WAVEFORMS
MAX618 toc07
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 200mA
2μs/div
0
V
OUT
(100mV/
div)
V
LX
(10V/div)
I
L
(1A/div)
HEAVY-LOAD SWITCHING
WAVEFORMS
MAX618 toc08
V
IN
= 5V, V
OUT
= 12V, I
OUT
= 500mA
2μs/div
3V
6V
V
OUT
(50mV/div)
V
IN
(5V/div)
LINE-TRANSIENT RESPONSE
MAX618 toc09
I
OUT
= 200mA, V
OUT
= 12V
2ms/div
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T
A
= +25°C.)
0
V
OUT
(200mV/div)
I
OUT
(100mA/div)
LOAD-TRANSIENT RESPONSE
MAX618 toc10
V
IN
= 5V, V
OUT
= 12V
5ms/div
5V
12V
0
SHDN
(2V/div)
V
OUT
(2V/div)
SHUTDOWN RESPONSE
MAX618 toc11
V
IN
= 5V, V
OUT
= 12V, I
LOAD
= 500mA
500μs/div
0
0.4
0.2
0.6
1.2
1.4
1.0
0.8
1.6
2 4567389101112
MAXIMUM OUTPUT CURRENT
vs. INPUT VOLTAGE
MAX618 toc12
INPUT VOLTAGE (V)
MAXIMUM OUTPUT CURRENT (A)
V
OUT
= 12V
0.40
0.45
0.55
0.50
0.60
0.65
0105 15202530
NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX618 toc04
INPUT VOLTAGE (V)
SUPPLY CIRRENT (mA)
300
400
350
500
450
550
600
650
700
-50 -10 10-30 30507090110
SUPPLY CURRENT vs. TEMPERATURE
MAX618 toc05
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
V
IN
= 8V
V
IN
= 5V
V
IN
= 3V
INCLUDES CAPACITOR LEAKAGE CURRENT
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
2127 17222732
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
MAX618 toc06
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT (μA)