Low Voltage OR-ing FET Controller
ISL6146
Features
The ISL6146 represents a family of OR-ing MOSFET controllers
capable of OR-ing voltages from 1V to 18V. Together with suitably
sized N-channel power MOSFETs, the ISL6146 increases power
distribution efficiency when replacing a power OR-ing diode in high
current applications. It provides gate drive voltage for the
MOSFET(s) with a fully integrated charge pump.
• OR-ing Down to 1V and Up to 20V with ISL6146A, ISL6146B,
ISL6146D and ISL6146E
• Programmable Voltage Compliant Operation with ISL6146C
• VIN Hot Swap Transient Protection Rating to +24V
• High Speed Comparator Provides Fast <0.3µs Turn-off in
Response to Shorts on Sourcing Supply
The ISL6146 allows users to adjust with external resistor(s) the
V
- V trip point, which adjusts the control sensitivity to system
OUT IN
• Fastest Reverse Current Fault Isolation with 6A Turn-off
Current
power supply noise. An open drain FAULT pin will indicate if a
conditional or FET fault has occurred.
• Very Smooth Switching Transition
The ISL6146A and ISL6146B are optimized for very low voltage
operation, down to 1V with an additional independent bias of 3V
or greater.
• Internal Charge Pump to Drive N-channel MOSFET
• User Programmable V - V
IN OUT
Vth for Noise Immunity
The ISL6146C provides a voltage compliant mode of operation
down to 3V with programmable Undervoltage Lock Out and
Overvoltage Protection threshold levels
• Open Drain FAULT Output with Delay
- Short between any two of the OR-ing FET Terminals
- GATE Voltage and Excessive FET V
- Power-Good Indicator (ISL6146C)
DS
The ISL6146D and ISL6146E are like the ISL6146A and ISL6146B
respectively but do not have conduction state reporting via the
fault output.
• MSOP and DFN Package Options
TABLE 1. KEY DIFFERENCES BETWEEN PARTS IN FAMILY
Applications
PART NUMBER
ISL6146A
ISL6146B
ISL6146C
ISL6146D
ISL6146E
KEY DIFFERENCES
• N+1 Industrial and Telecom Power Distribution Systems
Separate BIAS and VIN with Active High Enable
Separate BIAS and VIN with Active Low Enable
VIN with OVP/UVLO Inputs
• Uninterruptable Power Supplies
• Low Voltage Processor and Memory
• Storage and Datacom Systems
ISL6146A wo Conduction Monitor & Reporting
ISL6146B wo Conduction Monitor & Reporting
+
C
O
M
M
O
N
Q1
+
VIN GATE VOUT
BIAS
ISL6146B
P
O
W
E
VOLTAGE
DC/DC
(3V - 20V)
GATE FAST OFF, ~200ns FALL TIME
~70ns FROM 20V TO 12.6V ACROSS 57nF
GATE OUTPUT SINKING ~ 6A
ADJ
FLT
EN
R
B
U
S
GND
Q2
-
C
O
M
M
O
N
+
+
VIN GATE VOUT
VOUT
P
O
W
E
VOLTAGE
DC/DC
(3V - 20V)
BIAS
ADJ
ISL6146B
FLT
EN
R
B
U
S
GND
-
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. ISL6146 GATE HIGH CURRENT PULL-DOWN
April 26, 2013
FN7667.4
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
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