DATASHEET
ISL6142, ISL6152
Negative Voltage Hot Plug Controller
FN9086
Rev 1.00
July 2004
The ISL6142/52 are 14 pin, negative voltage hot plug
controllers that allow a board to be safely inserted and
removed from a live backplane. Inrush current is limited to a
programmable value by controlling the gate voltage of an
external N-channel pass transistor. The pass transistor is
turned off if the input voltage is less than the Under-Voltage
threshold, or greater than the Over-Voltage threshold. The
PWRGD/PWRGD outputs can be used to directly enable a
power module. When the Gate and DRAIN voltages are both
considered good the output is latched in the active state.
Typical Application
GND
Logic
GND
Supply
V
DD
FAULT
PWRGD
PWRGD
DIS
IS
R10
OUT
R4
R5
R6
ISL6142/ISL6152
UV
OV
CT
IS+ SENSE
V
GATE DRAIN
IS-
EE
LOAD
R3
C2
C1
The IntelliTripTM electronic circuit breaker and programmable
current limit features protect the system against short
circuits. When the Over-Current threshold is exceeded, the
output current is limited for a time-out period before the
circuit breaker trips and shuts down the FET. The time-out
period is programmable with an external capacitor
connected to the CT pin. If the fault disappears before the
programmed time-out, normal operation resumes. In
addition, the IntelliTripTM electronic circuit breaker has a fast
Hard Fault shutdown, with a threshold set at 4 times the
Over-Current trip point. When activated, the GATE is
immediately turned off and then slowly turned back on for a
single retry.
R7
CL
RL
R8
R9
C3
R2
-48V IN
R1
Q1
-48V OUT
C2 = 3.3nF (100V)
C3 = 1500pF (25V)
Q1 = IRF530
CL = 100uF (100V)
RL = Equivalent load
R1 = 0.02
(1%)
R6 = 10K
R7 = R8 = 400 (1%)
R9 = 4.99K
R10 = 5.1K
C1 = 150nF (25V)
(1%)
R2 = 10
R3 = 18K
R4 = 549K
(5%)
(5%)
(1%)
(1%)
(1%)
(10%)
R5 = 6.49K
Features
• Operates from -20V to -80V (-100V Absolute Max Rating)
• Programmable Inrush Current
• Programmable Time-Out
• Programmable Current Limit
• Programmable Over-Voltage Protection
• Programmable Under-Voltage Protection
The IS+, IS-, and IS
OUT
pins combine to provide a load
current monitor feature that presents a scaled version of the
load current at the IS pin. Current to voltage conversion
- 135 mV of hysteresis ~4.7V of hysteresis at the power
supply
OUT
is accomplished by placing a resistor (R9) from IS
negative input (-48V).
to the
OUT
• V
DD
Under-Voltage Lock-Out (UVLO) ~ 16.5V
• IntelliTripTM Electronic Circuit Breaker distinguishes
between severe and moderate faults
Related Literature
- Fast shutdown for short circuit faults with a single retry
(fault current > 4X current limit value).
• ISL6142/52EVAL1 Board Set, Document AN1000
• ISL6140/50EVAL1 Board Set, Document AN9967
• ISL6140/41EVAL1 Board Set, Document AN1020
• ISL6141/51 Hot Plug Controller, Document FN9079
• ISL6141/51 Hot Plug Controller, Document FN9039
• ISL6116 Hot Plug Controller, Document FN4778
NOTE: See www.intersil.com/hotplug for more information.
• FAULT pin reports the occurrence of an Over-Current
Time-Out
• Disable input controls GATE shutdown and resets Over-
Current fault latch
• Load Current Monitor Function
- IS
OUT
- A resistor from IS
provides a scaled version of the load current
to -V provides current to
OUT
IN
Pinout
voltage conversion
ISL6142 OR ISL6152 (14 LEAD SOIC)
• Power Good Control Output
14
13
12
11
10
9
PWRGD/PWRGD
1
V
DD
Top View
- Output latched “good” when DRAIN and GATE voltage
thresholds are met.
2
FAULT
DIS
CT
IS
3
4
5
OUT
ISL6142/52
OV
- (PWRGD active low: ISL6142 (L version)
- PWRGD active high: ISL6152 (H version)
• Pb-free available
DRAIN
GATE
IS+
UV
IS-
6
7
8
V
SENSE
EE
Applications
• VoIP (Voice over Internet Protocol) Servers
• Telecom systems at -48V
• Negative Power Supply Control
• +24V Wireless Base Station Power
FN9086 Rev 1.00
July 2004
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