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MAX1964

Tracking/Sequencing Triple/Quintuple Power-Supply Controllers

Maxim Integrated 

Tracking/Sequencing Triple/Quintuple

Power-Supply Controllers

Typical Operating Characteristics (continued)

(Circuit of Figure 1, VIN = 12V, VOUT - 3.3V, TA = +25°C, unless otherwise noted.)

NEGATIVE LINEAR REGULATOR

OUTPUT VOLTAGE vs. SUPPLY VOLTAGE

(QLDO = TIP29)

-12.00

-12.06

-12.12

-12.18

ILDO(NEG) = 100mA

ILDO(NEG) = 1mA

-12.24

-20 -18 -16 -14 -12 -10

SUPPLY VOLTAGE (V)

PIN

MAX1964 MAX1965

1

1

2

2

3

3

4

4

5

5

6

6

Pin Description

NAME

POK

COMP

OUT

FB

B2

FB2

FUNCTION

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 ✕ VIN. The feedback set point is 1.236V.

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.

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