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0V to 16V, Dual Hot-Swap Controller with 10-Bit
Current and Voltage Monitor and 4 LED Drivers
The MAX5970 provides a great deal of system flexibil-
ity because the current-sense range, DAC setting, and
threshold ratio can be changed on the fly for systems
that must protect a wide range of interchangeable
load devices, or for systems that control the allocation
of power to smart loads. Table 6 shows the specified
ranges for the fast-trip and slow-trip thresholds for all
combinations of current-sense range and threshold ratio.
When an overcurrent event causes the MAX5970 to shut
down a channel, a corresponding open-drain FAULT_
output alerts the system. Figure 2 shows the operation
and fault-management flowchart for one channel of the
MAX5970.
Table 6. Specified Current-Sense and Circuit-Breaker Threshold Ranges
IRNG_ INPUT
Low
High
Unconnected
FAST-TRIP DAC
OUTPUT RANGE (mV)
10 to 25
20 to 50
40 to 100
GAIN (2-BIT) (V FAST /V SLOW )
ifast2slow
(DEFAULT = 11)
00 (125%)
01 (150%)
10 (175%)
11 (200%)
00 (125%)
01 (150%)
10 (175%)
11 (200%)
00 (125%)
01 (150%)
10 (175%)
11 (200%)
SLOW-TRIP THRESHOLD RANGE
(mV)
8.00 to 20.00
6.67 to 16.67
5.71 to 14.29
5.00 to 12.50
16.00 to 40.00
13.33 to 33.33
11.48 to 28.57
10.00 to 25.00
32.00 to 80.00
26.67 to 66.67
22.86 to 57.14
20.00 to 50.00
Table 7a. IRNG Inputs Status Register Format
Description:
Register Title:
Register Address:
Fast-trip threshold maximum range setting bits, from IRNG_ three-state inputs
Status 2
0x33
R/W
R/W
R/W
R/W
RESET
VALUE
—
bit 7
—
bit 6
—
bit 5
—
bit 4
CH1_
IRNG1
bit 3
CH1_
IRNG0
bit 2
CH0_
IRNG1
bit 1
CH0_
IRNG0
bit 0
—
Table 7b. Setting Current-Sense Range
IRNG_ PIN STATE
Low
High
Open
Chx_IRNG1
1
0
0
Chx_IRNG0
0
1
0
MAXIMUM CURRENT-SENSE
SIGNAL (mV)
25
50
100
18
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