Rainbow Electronics MAX1585 - Manual (Page 8)

MAX1584/MAX1585
5-Channel Slim DSC Power Supplies
8 _______________________________________________________________________________________
NO-LOAD INPUT CURRENT
vs. INPUT VOLTAGE (SWITCHING)
MAX1584/85 toc07
INPUT VOLTAGE (V)
INPUT CURRENT (mA)
4.5 4.0 3.0 3.5 1.0 1.5 2.0 2.5 0.5
1
2
3
4
5
6
7
8
9
0
0 5.0
BOOST-BUCK (SU + AUX3)
V SU = 5.0V, OUT3 = 3.33V
V SU = 5.0V
MINIMUM STARTUP VOLTAGE
vs. LOAD CURRENT (V SU )
MAX5184/85 toc08
LOAD CURRENT (mA)
MINIMUM STARTUP VOLTAGE (V)
800 600 400 200
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0
0 1000
SCHOTTKY DIODE CONNECTED
FROM IN TO V
SU
REFERENCE VOLTAGE
vs. TEMPERATURE
MAX1584/85 toc09
TEMPERATURE ( °C)
REFERENCE VOLTAGE (V)
75 50 25 0 -25
1.246
1.248
1.251
1.254
1.243
-50 100
REFERENCE VOLTAGE
vs. REFERENCE LOAD CURRENT
MAX1584/85 toc10
REFERENCE LOAD CURRENT ( µA)
REFERENCE VOLTAGE (V)
250 200 150 100 50
1.245
1.246
1.247
1.248
1.249
1.250
1.244
0 300
OSCILLATOR FREQUENCY vs. R OSC
MAX1584/85 toc11
R
OSC
(k Ω)
OSCILLATOR FREQUENCY (kHz)
100 10
100
300
500
700
900
1100
-100
1 1000
C OSC = 470pF
C OSC = 330pF
C OSC = 220pF
C OSC = 100pF
C OSC = 47pF
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX1584/85 toc12
TEMPERATURE ( °C)
SWITCHING FREQUENCY (kHz)
75 50 25 0 -25
502
503
504
505
506
507
508
509
510
501
-50 100
R OSC = 51k Ω
C OSC = 100pF
Typical Operating Characteristics (continued)
(Circuit of Figure 1, T A = +25°C, unless otherwise noted.)