1

®

FN9079.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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Copyright © Intersil Americas Inc. 2002, 2004. All Rights Reserved

Intellitrip™ is a trademark of Intersil Americas Inc.

ISL6141, ISL6151

Negative Voltage Hot Plug Controller

The ISL6141 is an 8-pin, negative voltage hot plug controller

that allows 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

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 600

µs before the circuit breaker shuts down the

FET. If the fault disappears before the 600

µs time-out,

electronic circuit breaker has a fast Hard Fault shutdown with

a threshold set at 4 times the current limit value. When

activated, the GATE is immediately turned off and then

slowly turned back on for a single retry (soft-start). The

active low PWRGD signal can be used to directly enable a

power module (with a low enable input). The ISL6151 is the

same device but has an active high PWRGD output.

Typical Application (RL, CL are the Load)

Features

• Operates from -20V to -80V (-100V Absolute Max Rating)

• Programmable Inrush Current

• Programmable Over-Voltage Protection

• Programmable Under-Voltage Protection

- 135mV of hysteresis

- Equals ~4.6V of hysteresis at the power supply

• UVLO (Under-Voltage Lock-Out) ~ 16.5V

• Programmable Current Limit with 600

µs time-out

between Over-Current and Hard Fault conditions

- Fast shutdown for Hard Faults with a single retry (fault

current > 4X current limit value).

• Pin Compatible with ISL6140/50.

• Power Good Control Output

- Monitors both the DRAIN (voltage drop across the FET)

and the GATE voltage; once both are OK, the Power

Good output is latched in the active state.

- PWRGD active high: ISL6151 (H version)

-PWRGD active low: ISL6141 (L version)

• Pb-free available

Applications

• VoIP (Voice over Internet Protocol) Servers

• Telecom systems at -48V

• Negative Power Supply Control

• +24V Wireless Base Station Power

Related Literature

• ISL6140/41 EVAL1 Board Set, Document # AN9967

• ISL6142/52 EVAL1 Board Set, Document # AN1000

• ISL6140/50 Hot Plug Controller, Document # FN9039

• ISL6116 Hot Plug Controller, Document # FN4778

NOTE: See www.intersil.com/hotplug for more information.

Pinout

ISL6141 OR ISL6151 (8 LEAD SOIC)

ISL6141 has active low (L version) PWRGD output pin

ISL6151 has active high (H version) PWRGD output pin

R1 = 0.02

Ω (1%)

R2 = 10

Ω (5%)

R3 = 18k

Ω (5%)

R4 = 549k

Ω (1%)

R5 = 6.49k

Ω (1%)

R6 = 10k

Ω (1%)

C1 = 150nF (25V)

C2 = 3.3nF (100V)

Q1 = IRF530 (100V, 17A, 0.11

Ω)

CL = 100

µF (100V)

RL = equivalent load

ISL6141

UV

OV

SENSE

GATE

DRAIN

PWRGD

R4

R5

R6

R1

R2

R3

C2

C1

Q1

CL

GND

GND

-48V IN

-48V OUT

RL

(LOAD)

OV

5

7

6

4

3

2

GATE

DRAIN

UV

SENSE

PWRGD/PWRGD 1

8

TOP VIEW

Data Sheet

July 2004