MAX1965 Maxim Integrated Products, MAX1965 Datasheet - Page 9

• Manufacturer Part Number: MAX1965
• Description: (MAX1964 / MAX1965) Tracking/Sequencing Triple/Quintuple Power-Supply Controllers
• Manufacturer: Maxim Integrated Products

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(Circuit of Figure 1, V
MAX1964
1
2
3
4
5
6
PIN
MAX1965
1
2
3
4
5
6
_______________________________________________________________________________________
IN
= 12V, V
Tracking/Sequencing Triple/Quintuple
OUT
NAME
COMP
POK
OUT
FB2
FB
B2
- 3.3V, T
-12.00
-12.06
-12.12
-12.18
-12.24
Open-Drain Power-Good Output. POK is low when any output voltage is more than
10% below its regulation point. POK is high impedance when all the outputs are in
regulation. Connect a resistor between POK and VL for logic-level voltages.
Compensation Pin. Connect the compensation network to GND to compensate the
control loop.
Regulated Output Voltage High-Impedance Sense Input. Internally connected to a
resistive-divider and negative gain block (MAX1965).
Dual-Mode Switching-Regulator Feedback Input. Connect to GND for the preset 3.3V
output. Connect to a resistive-divider from the output to FB to GND to adjust the output
voltage between 1.236V and 0.75
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.
A
= +25°C, unless otherwise noted.)
Typical Operating Characteristics (continued)
-20
OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
NEGATIVE LINEAR REGULATOR
-18
I
SUPPLY VOLTAGE (V)
LDO(NEG)
(Q
-16
LDO
I
Power-Supply Controllers
LDO(NEG)
= 100mA
= TIP29)
= 1mA
-14
-12
✕
V
IN
-10
FUNCTION
. The feedback set point is 1.236V.
Pin Description
9