Low Voltage OR-ing FET Controller
ISL6146
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.
The ISL6146 allows users to adjust with external resistor(s) the
V
OUT
- V
IN
trip point, which adjusts the control sensitivity to system
power supply noise. An open drain FAULT pin will indicate if a
conditional or FET fault has occurred.
The ISL6146A and ISL6146B are optimized for very low voltage
operation, down to 1V with an additional independent bias of 3V
or greater.
The ISL6146C provides a voltage compliant mode of operation
down to 3V with programmable Undervoltage Lock Out and
Overvoltage Protection threshold levels
The ISL6146D and ISL6146E are like the ISL6146A and ISL6146B
respectively but do not have conduction state reporting via the
fault output
.
TABLE 1. KEY DIFFERENCES BETWEEN PARTS IN FAMILY
PART NUMBER
ISL6146A
ISL6146B
ISL6146C
ISL6146D
ISL6146E
KEY DIFFERENCES
Separate BIAS and VIN with Active High Enable
Separate BIAS and VIN with Active Low Enable
VIN with OVP/UVLO Inputs
ISL6146A wo Conduction Monitor & Reporting
ISL6146B wo Conduction Monitor & Reporting
Features
• 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
• Fastest Reverse Current Fault Isolation with 6A Turn-off
Current
• Very Smooth Switching Transition
• Internal Charge Pump to Drive N-channel MOSFET
• User Programmable V
IN
- V
OUT
Vth for Noise Immunity
• Open Drain FAULT Output with Delay
- Short between any two of the OR-ing FET Terminals
- GATE Voltage and Excessive FET V
DS
- Power-Good Indicator (ISL6146C)
• MSOP and DFN Package Options
Applications
• N+1 Industrial and Telecom Power Distribution Systems
• Uninterruptable Power Supplies
• Low Voltage Processor and Memory
• Storage and Datacom Systems
Q1
+
VIN GATE VOUT
BIAS
ADJ
ISL6146B
FLT
GND
-
Q2
+
VIN GATE VOUT
VOUT
BIAS
ADJ
ISL6146B
FLT
GND
-
EN
EN
+
C
O
M
M
O
N
P
O
W
E
R
B
U
S
+C
O
M
M
O
N
P
O
W
E
R
B
U
S
GATE FAST OFF, ~200ns FALL TIME
~70ns FROM 20V TO 12.6V ACROSS 57nF
GATE OUTPUT SINKING ~ 6A
VOLTAGE
DC/DC
(3V - 20V)
VOLTAGE
DC/DC
(3V - 20V)
FIGURE 1. TYPICAL APPLICATION
FIGURE 2. ISL6146 GATE HIGH CURRENT PULL-DOWN
April 26, 2013
FN7667.4
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774
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