max5970 Maxim Integrated Products, Inc., max5970 Datasheet - Page 15

• Manufacturer Part Number: max5970
• Description: 0v To 16v, Dual Hot-swap Controller With 10-bit Current And Voltage Monitor And 4 Led Drivers
• Manufacturer: Maxim Integrated Products, Inc.

0V to 16V, Dual Hot-Swap Controller with 10-Bit
Table 4a. status1 Register Function
Table 4b. status1 Register Format
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
MOSFET and ground, with the midpoint connected to
ON_. The turn-on threshold voltage for the channel is
then:
The maximum rating for the ON_ is 6V; do not exceed
this value.
Description:
Register Title:
Register Address:
Current and Voltage Monitor and 4 LED Drivers
REGISTER
ADDRESS
prot[1]
bit 7
0x32
R
V
EN
prot[0]
______________________________________________________________________________________
bit 6
RANGE
= 0.6V x (R1 + R2)/R2
R
[1:0]
[7:6]
BIT
[4]
Channel grouping (three-state MODE input), fault-detection behavior (three-state PROT input), and
ON_ inputs status register
status1
0x32
ON_ Inputs State
1 = ON_ above 600mV channel enable threshold
0 = ON_ below 600mV channel enable threshold
Bit 0: ON1
Bit 1: ON2
Channel Grouping Mode (MODE Input)
0 = Grouped (MODE high or open)
1 = Independent (MODE low)
Voltage Critical Behavior (PROT Input)
00 = Assert ALERT upon UV/OV critical (same as UV/OV warning behavior)
01 = Assert ALERT and deassert PG_ upon UV/OV critical
10 = Assert ALERT, deassert PG_, and shutdown channel(s) upon UV/OV critical
11 = (Not possible)
bit 5
—
R
mode[0]
bit 4
R
bit 3
—
R
When all conditions for channel turn-on are met, the
external n-channel MOSFET switch is fully enhanced
with a typical gate-to-source voltage of 5V to ensure
a low drain-to-source resistance. The charge pump at
each GATE_ driver sources 5FA to control the output
voltage turn-on voltage slew rate. An external capacitor
can be added from GATE_ to GND_ to further reduce the
voltage slew rate. Placing a 1kI resistor in series with
this capacitance prevents the added capacitance from
increasing the gate turn-off time. Total inrush current is
the load current summed with the product of the gate
voltage slew rate dV/dt and the load capacitance.
DESCRIPTION
bit 2
—
R
ON2
bit 1
R
ON1
bit 0
R
RESET
VALUE
Startup
0x00
15