ISL6141 Intersil Corporation, ISL6141 Datasheet - Page 2

• Manufacturer Part Number: ISL6141
• Description: Negative Voltage Hot Plug Controller
• Manufacturer: Intersil Corporation

Pin Descriptions
PWRGD (ISL6141; L Version) Pin 1
This digital output is an open-drain pull-down device. During
start-up the DRAIN and GATE voltages are monitored with
two separate comparators. The first comparator looks at the
DRAIN pin voltage compared to the internal V
(V
the external FET and sense resistor. When the DRAIN to V
voltage drop is less than 1.3V, the first of two conditions
required for the power to be considered good are met. In
addition, the GATE voltage monitored by the second
comparator must be within approximately 2.5V of its normal
operating voltage (13.6V). When both criteria are met the
PWRGD output will transition from high to low, enabling a
PG
GND
is nominal 1.3V); this measures the voltage drop across
-48V IN
R4
R5
R6
UV
OV
V
EE
2
V
R1
EE
1.255V
1.255V
210mV
1.265V
V
50mV
EE
+
+
+ -
+ -
+
-
-
-
V
V
V
V
EE
EE
EE
EE
+
+
+
+
+
-
-
-
-
-
SENSE
PG
reference
FIGURE 1. BLOCK DIAGRAM
REGULATOR
UV
OV
GATE DRIVE
HARD
FAULT
UVLO
CURRENT
TIMER
LOGIC
TIMING
600 s
ISL6141, ISL6151
LIMIT
GATE
GATE
C1
EE
R2
Q1
V
11.1V
GATE
1.3V
+
EE
+
REFERENCES
-
-
REGULATOR,
V
R3
power module in some applications. The output is latched in
the low state until any of the signals that shut off the GATE
occur (Over-Voltage, Under-Voltage, Under-Voltage Lock-
Out, Over-Current Time-Out, or powering down). Any of these
conditions will re-set the latch and the PWRGD output will
transition from low to high indicating power is no longer good.
In this case the output pull-down device shuts off, and the pin
becomes high impedance. Typically an external pull-up of
some kind is used to pull the pin high (many brick regulators
have a pull-up function built in).
PWRGD (ISL6151; H Version) Pin 1 -
output is used to provide an active high signal to enable an
external module. The Power Good comparators are the
EE
13V
+
+
-
-
C2
V
DD
DRAIN
OUTPUT
PWRGD
PWRGD
LATCH
LOGIC
DRIVE
LOAD
PWRGD
(ISL6141)
PWRGD
(ISL6151)
CL
-48V OUT
This digital
RL
GND