Owner manual

MAX1864/MAX1865
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
_______________________________________________________________________________________ 7
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
OUT
= 3.3V, T
A
= +25°C, unless otherwise noted.)
2.50
0.01 10.1 100
POSITIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. LOAD CURRENT
(Q
LDO
= 2N3905)
2.42
2.44
2.46
2.48
MAX18664/65 toc10
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
10 1000
V
SUP(POS)
= 5.0V
V
SUP(POS)
= 3.3V
2.42
2.44
2.46
2.48
2.50
243 5678
POSITIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
(Q
LDO
= 2N3905)
MAX1864/65 toc11
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
OUT2
= 1mA
I
OUT2
= 100mA
80
70
60
50
40
30
20
10
0
0.1 10 1001 1000
POSITIVE LINEAR REGULATOR
POWER-SUPPLY REJECTION RATIO
(Q
LDO
= 2N3905)
MAX1864/65 toc12
FREQUENCY (kHz)
PSRR (dB)
I
OUT2
= 50mA
POSITIVE LINEAR REGULATOR
LOAD TRANSIENT
(Q
LDO
= 2W3905)
MAX1864/65 toc13
100mA
2.457V
2.467V
A. I
OUTZ
= 1mA TO 100mA, 50mA/div
B. V
OUTZ
= 2.5V, 5mV/div
C
LDO(POS)
= 10
µ
F CERAMIC, V
SUP(POS)
= 3.3V
CIRCUIT OF FIGURE 1
0
B
A
10
µ
s/div
2.50
0.01 0.1 1000100
POSITIVE LINEAR REGUALTOR
OUTPUT VOLTAGE vs. LOAD CURRENT
(Q
LDO
= TIP30)
2.42
2.44
2.46
2.48
MAX1864/65 toc14
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
110
V
SUP(POS)
= 5.0V
V
SUP(POS)
= 3.3V
2.42
2.44
2.46
2.48
2.50
24681012
POSITIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
(Q
LDO
= TIP30)
MAX1864/65 toc15
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
OUT2
= 1mA
I
OUT2
= 100mA