max5934aeeet Maxim Integrated Products, Inc., max5934aeeet Datasheet - Page 9

• Manufacturer Part Number: max5934aeeet
• Description: Max5934, Max5934a Positive High-voltage, Hot-swap Controllers With Selectable Fault Management And Status Polarity
• Manufacturer: Maxim Integrated Products, Inc.

The MAX5934/MAX5934A are fully integrated hot-swap
controllers for positive supply rails. These devices allow
for the safe insertion and removal of circuit cards into
live backplanes without causing glitches on the back-
plane power-supply rail. During startup, the MAX5934/
MAX5934A act as current regulators using an external
sense resistor and MOSFET to limit the amount of cur-
rent drawn by the load.
The MAX5934A operates from a +9V to +80V supply
voltage range and has a default UVLO set to +8.3V.
The MAX5934 operates from a +33V to +80V supply
voltage range and has a default UVLO set to +31V. The
UVLO threshold is adjustable using a resistive divider
connected from V
Figure 5).
Figure 5. Application Circuit
Selectable Fault Management and Status Polarity
Positive High-Voltage, Hot-Swap Controllers with
V
IN
CC
_______________________________________________________________________________________
to ON to GND (see R2 and R3 in
R2
49.9kΩ
1%
R3
3.4kΩ
1%
Detailed Description
V
CC
C
0.68µF
TIMER
V
V
CC
CC
10
15
1
2
3
POL_SEL
ON
TIMER
LATCH/RETRY
DC
V
CC
16
0.025Ω
R
SENSE
MAX5934A
MAX5934
14
SENSE
GND
8
1kΩ, 5%
C1
10nF
R1
PWRGD1
PWRGD2
PWRGD3
The MAX5934/MAX5934A monitor input voltage, output
voltage, output current, and die temperature. These
devices feature three power-good outputs (PWRGD_)
to indicate status by monitoring the voltage at FB1,
FB2, and GATE (see the Power-Good (PWRGD_)
Detection section). PWRGD1 indicates an output-volt-
age status, PWRGD2 can be used to indicate an over-
voltage condition on the main power-supply rail, and
PWRGD3 asserts when GATE voltage has charged to
4.3V above the supply rail. PWRGD3 deasserts when
the TIMER voltage exceeds a 1.233V threshold in
response to an extended fault condition.
The MAX5934/MAX5934A control gate voltage on the
external MOSFET to limit load current at startup and at
overload to a value determined as:
11
GATE
OUT
FB1
FB2
R
10Ω
5%
G
4
6
5
7
12
9
M1
3.57kΩ
59kΩ
IRF530
1%
1%
R4
R5
24kΩ
V
MONITOR
5%
R6
PWRGD1
R10
1kΩ
1%
R9
90kΩ
1%
24kΩ
5%
R7
PWRGD2
R
L
PWRGD3
C
L
9