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MAX1864TEEE+

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
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
MAX1864/MAX1865
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
8 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(Circuit of Figure 1, V
IN
= 12V, V
OUT
= 3.3V, T
A
= +25°C, unless otherwise noted.)
-12.00
-12.06
-12.12
-12.18
-12.24
0.01 1
10
1000.1 1000
NEGATIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. LOAD CURRENT
(Q
LDO
= TIP29)
MAX1864/65 toc19
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
V
SUP(NEG)
= -15V
V
OUT3
= 5V
-12.24
-12.18
-12.12
-12.06
-12.00
-20 -18 -16 -14 -12 -10
NEGATIVE LINEAR REGULATOR
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
(Q
LDO
= TIP29)
MAX1864/65 toc20
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
I
LDO(NEG)
= 100mA
I
LDO(NEG)
= 1mA
80
70
60
50
40
30
20
10
0
0.1 10 1001 1000
POSITIVE LINEAR REGULATOR
POWER-SUPPLY REJECTION RATIO
(Q
LDO
= TIP30)
MAX1864/65 toc16
FREQUENCY (kHz)
PSRR (dB)
I
OUT2
= 150mA
POSITIVE LINEAR REGULATOR
LOAD TRANSIENT
(Q
LDO
= TIP30)
MAX1864/65 toc17
250mA
2.453V
2.473V
A. I
OUT2
= 10mA TO 250mA, 200mA/div
B. V
OUT2
= 2.5V, 10mV/div
C
LDO(POS)
= 10
μ
F CERAMIC, V
SUP(POS)
= 3.3V
CIRCUIT OF FIGURE 1
0
B
A
10
μ
s
0
10
5
25
20
15
40
35
30
45
0426810
NEGATIVE LINEAR REGULATOR BASE-
DRIVE CURRENT vs. BASE-DRIVE VOLTAGE
MAX1864/65 toc18
V
OUT
- V
B5
(V)
BASE-DRIVE SOURCE CURRENT (mA)
V
FB5
= 250mV
V
FB5
= 50mV
V
OUT
= 5.0V
V
OUT
= 3.3V
B5 (MAX1865) ONLY
MAX1864/MAX1865
xDSL/Cable Modem Triple/Quintuple Output
Power Supplies
_______________________________________________________________________________________ 9
Pin Description
PIN
MAX1864
MAX1865
NAME FUNCTION
11POK
Open-Drain Power-Good Output. POK is low when the output voltage is more than
10% below the regulation point. POK is high impedance when the output is in
regulation. Connect a resistor between POK and VL for logic-level voltages.
2 2 COMP
Compensation Pin. Connect a series RC to GND to compensate the control loop.
Typical values are 47kΩ and 8.2nF.
3 3 OUT
Regulated Output Voltage High-Impedance Sense Input. Internally connected to a
resistive-divider and negative gain block (MAX1865).
44FB
Dual Mode Switching-Regulator Feedback Input. Connect to GND for the preset 3.3V
output. Connect to a resistive-divider from output to FB to GND to adjust the output
voltage between 1.236V and 0.8
✕ V
IN
. The feedback set point is 1.236V.
55B2
Open-Drain Output PNP Transistor Driver (Regulator #2). Internally connected to the
drain of a DMOS. B2 connects to the base of an external PNP pass transistor to form a
positive linear regulator.
6 6 FB2
Analog Gain-Block Feedback Input (Regulator #2). Connect to a resistive-divider
between the positive linear regulator’s output and GND to adjust the output voltage.
The feedback set point is 1.24V.
77B3
Open-Drain Output PNP Transistor Driver (Regulator #3). Internally connected to the
drain of a DMOS. B3 connects to the base of an external PNP pass transistor to form a
positive linear regulator.
8 8 FB3
Analog Gain-Block Feedback Input (Regulator #3). Connect to a resistive-divider
between the positive linear regulator’s output and GND to adjust the output voltage.
The feedback set point is 1.24V.
—9B4
Open-Drain Output PNP Transistor Driver (Regulator #4). Internally connected to the
drain of a DMOS. B4 connects to the base of an external PNP pass transistor to form a
positive linear regulator.
— 10 FB4
Analog Gain-Block Feedback Input (Regulator #4). Connect to a resistive-divider
between the positive linear regulator’s output and GND to adjust the output voltage.
The feedback set point is 1.24V.
—11B5
Open-Drain Output NPN Transistor Driver (Regulator #5). Internally connected to the
drain of a P-channel MOSFET. B5 connects to the base of an external NPN pass
transistor to form a negative linear regulator.
— 12 FB5
Analog Gain-Block Feedback Input (Regulator #5). Connect to a resistive-divider
between the negative linear regulator’s output and a positive reference voltage,
typically one of the positive linear regulator outputs, to adjust the output voltage. The
feedback set point is at GND.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

MAX1864TEEE+

Mfr. #:
Buy MAX1864TEEE+
Manufacturer:
Maxim Integrated
Description:
Switching Controllers xDSL/Cable Modem Triple/Quint Output
Lifecycle:
New from this manufacturer.
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