Rainbow Electronics MAX669 - Manual (Page 6)

MAX668/MAX669
1.8V to 28V Input, PWM Step-Up
Controllers in µMAX
6 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuits of Figures 2, 3, 4, and 5; T A = +25°C; unless otherwise noted.)
1.240
1.242
1.243
1.241
1.245
1.246
1.244
1.248
1.249
1.247
1.250
-40 -20 0 20 40 60 80 100
REFERENCE VOLTAGE vs.
TEMPERATURE
MAX668 toc10
TEMPERATURE ( ° C)
REFERENCE VOLTAGE (V)
V CC = 5V
0
100
150
50
250
300
200
400
450
350
500
0 100 200 300 400 500
SWITCHING FREQUENCY vs. R OSC
MAX668 toc11
R OSC (k Ω )
SWITCHING FREQUENCY (kHz)
V CC = 5V
0
100
300
400
500
600
-40 0 -20 20 40 60 80 100
SWITCHING FREQUENCY vs.
TEMPERATURE
MAX668 toc12
TEMPERATURE ( ° C)
SWITCHING FREQUENCY (kHz)
200
100k Ω
165k Ω
499k Ω
V IN = 5V
100 1000 10,000
EXT RISE/FALL TIME vs.
CAPACITANCE
MAX668 toc13
CAPACITANCE (pF)
EXT RISE/FALL TIME (ns)
60
0
10
20
30
40
50
t R , V CC = 3.3V
t F , V CC = 3.3V
t R , V CC = 5V
t F , V CC = 5V