Typical operating characteristics (continued) – Rainbow Electronics MAX669 User Manual
Page 7
MAX668/MAX669
1.8V to 28V Input, PWM Step-Up
Controllers in µMAX
_______________________________________________________________________________________
7
EXITING SHUTDOWN
MAX668 toc14
OUTPUT
VOLTAGE
5V/div
INDUCTOR
CURRENT
2A/div
SHUTDOWN
VOLTAGE
5V/div
MAX668, V
IN
= 5V, V
OUT
= 12V, LOAD = 1.0A, R
OSC
= 100k
Ω
,
LOW VOLTAGE, NON-BOOTSTRAPPED
500
µ
s/div
0V
0V
0A
ENTERING SHUTDOWN
MAX668 toc15
OUTPUT
VOLTAGE
5V/div
SHUTDOWN
VOLTAGE
5V/div
MAX668, V
IN
= 5V, V
OUT
= 12V, LOAD = 1.0A,
LOW VOLTAGE, NON-BOOTSTRAPPED
200
µ
s/div
0V
0V
HEAVY-LOAD SWITCHING WAVEFORM
MAX668 toc16
V
OUT
200mV/div
AC-COUPLED
I
L
1A/div
Q1, DRAIN
5V/div
MAX668, V
IN
= 5V, V
OUT
= 12V, I
LOAD
= 1.0A,
LOW VOLTAGE, NON-BOOTSTRAPPED
1
µ
s/div
0V
0A
LOAD-TRANSIENT RESPONSE
MAX668 toc18
OUTPUT
VOLTAGE
AC-COUPLED
100mV/div
LOAD
CURRENT
1A/div
MAX668, V
IN
= 5V, V
OUT
= 12V, I
LOAD
= 0.1A TO 1.0A,
LOW VOLTAGE, NON-BOOTSTRAPPED
1ms/div
LIGHT-LOAD SWITCHING WAVEFORM
MAX668 toc17
V
OUT
100mV/div
AC-COUPLED
I
L
1A/div
Q1, DRAIN
5V/div
MAX668, V
IN
= 5V, V
OUT
= 12V, I
LOAD
= 0.1A,
LOW VOLTAGE, NON-BOOTSTRAPPED
1
µ
s/div
0V
0A
Typical Operating Characteristics (continued)
(Circuits of Figures 2, 3, 4, and 5; T
A
= +25°C; unless otherwise noted.)
LINE-TRANSIENT RESPONSE
MAX668 toc19
INPUT
VOLTAGE
5V/div
0V
OUTPUT
VOLTAGE
100mV/div
AC-COUPLED
MAX668, V
IN
= 5V TO 8V, V
OUT
= 12V, LOAD = 1.0A,
HIGH VOLTAGE, NON-BOOTSTRAPPED
20ms/div