Manual

MAX5961

0 to 16V, Quad, Hot-Swap Controller

with 10-Bit Current and Voltage Monitor

18 ______________________________________________________________________________________

Figure 1 shows the detailed logic operation of the hot-

swap enable signals Chx_EN1, Chx_EN2, and ON_, as

well as the effect of various fault conditions.

An input undervoltage threshold control for enabling the

hot-swap channel can be implemented by placing a

resistive divider between the drain of the hot-swap FET

and ground, with the midpoint connected to ON_. The

turn-on threshold voltage for the channel is then:

= 0.6V x (R1 + R2)/R2

The maximum rating for the ON_ pin is 6V; do not

exceed this value.

Table 4b. status1 Register Format

Description:

Channel grouping (three-state MODE input), fault-detection behavior (three-state PROT input), and

ON_ inputs status register

RRRRRRRR

RESET

VALUE

prot[1] prot[0] mode[1] mode[0] ON4 ON3 ON2 ON1 —

bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0

ON_

FORCE-ON

BIT

200ms DELAY,

THEN PULSE

CHANNEL

ENABLED

EN1_BIT

EN2_BIT

ANALOG SLOW_TRIP

RETRY PIN

ANALOG FAST_TRIP

UV/OV CRITICAL

PROT

Figure 1. Channel On-Off Control Logic Functional Schematic