MAX1864 Maxim, MAX1864 Datasheet - Page 9

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

MAX1864
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1
2
3
4
5
6
7
8
PIN
xDSL/Cable Modem Triple/Quintuple Output
MAX1865
10
11
12
1
2
3
4
5
6
7
8
9
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NAME
COMP
POK
OUT
FB2
FB3
FB4
FB5
FB
B2
B3
B4
B5
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.
Compensation Pin. Connect a series RC to GND to compensate the control loop.
Typical values are 47kΩ and 8.2nF.
Regulated Output Voltage High-Impedance Sense Input. Internally connected to a
resistive-divider and negative gain block (MAX1865).
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
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.
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.
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.
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.
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.
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.
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.
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.
✕
V
IN
FUNCTION
. The feedback set point is 1.236V.
Power Supplies
Pin Description
9