MAX1864 Maxim, MAX1864 Datasheet - Page 8

• Manufacturer Part Number: MAX1864
• Description: xDSL/Cable Modem Triple/Quintuple Output Power Supplies
• Manufacturer: Maxim

xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
8
(Circuit of Figure 1, V
_______________________________________________________________________________________
80
70
60
50
40
30
20
10
0
0.1
POWER-SUPPLY REJECTION RATIO
I
OUT2
POSITIVE LINEAR REGULATOR
= 150mA
-12.00
-12.06
-12.12
-12.18
-12.24
1
(Q
FREQUENCY (kHz)
0.01
LDO
IN
OUTPUT VOLTAGE vs. LOAD CURRENT
V
V
= TIP30)
10
= 12V, V
SUP(NEG)
OUT3
NEGATIVE LINEAR REGULATOR
0.1
= 5V
= -15V
LOAD CURRENT (mA)
100
(Q
OUT
LDO
1
= TIP29)
= 3.3V, T
1000
10
250mA
2.473V
2.453V
A
100
= +25°C, unless otherwise noted.)
0
Typical Operating Characteristics (continued)
A. I
B. V
C
CIRCUIT OF FIGURE 1
LDO(POS)
1000
OUT2
OUT2
POSITIVE LINEAR REGULATOR
= 10mA TO 250mA, 200mA/div
= 2.5V, 10mV/div
= 10µF CERAMIC, V
LOAD TRANSIENT
(Q
LDO
10µs
= TIP30)
SUP(POS)
MAX1864/65 toc17
= 3.3V
-12.00
-12.06
-12.12
-12.18
-12.24
A
B
-20
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
NEGATIVE LINEAR REGULATOR
-18
45
40
35
30
25
20
15
10
5
0
I
LDO(NEG)
SUPPLY VOLTAGE (V)
DRIVE CURRENT vs. BASE-DRIVE VOLTAGE
(Q
0
NEGATIVE LINEAR REGULATOR BASE-
LDO
-16
I
LDO(NEG)
V
FB5
= 100mA
= TIP29)
= 250mV
2
= 1mA
-14
V
4
OUT
-12
- V
B5 (MAX1865) ONLY
B5
6
(V)
-10
V
FB5
V
V
OUT
OUT
= 50mV
8
= 5.0V
= 3.3V
10