DATASHEET
ISL6146
Low Voltage OR-ing FET Controller
FN7667
Rev 5.00
Aug 17, 2015
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.
Features
• OR-ing down to 1V and up to 20V with ISL6146A, ISL6146B,
ISL6146D and ISL6146E
• Programmable voltage compliant operation with ISL6146C
• V hot swap transient protection rating to +24V
IN
The ISL6146 allows users to adjust with external resistor(s) the
• High speed comparator provides fast <0.3µs turn-off in
response to shorts on sourcing supply
V
- V trip point, which adjusts the control sensitivity to system
OUT IN
power supply noise. An open drain FAULT pin will indicate if a
conditional or FET fault has occurred.
• Fastest reverse current fault isolation with 6A turn-off
current
The ISL6146A and ISL6146B are optimized for very low voltage
operation, down to 1V with an additional independent bias of 3V
or greater.
• Very smooth switching transition
• Internal charge pump to drive N-channel MOSFET
The ISL6146C provides a voltage compliant mode of operation
down to 3V with programmable undervoltage lock out and
overvoltage protection threshold levels.
• User programmable V - V
IN OUT
Vth for noise immunity
• Open-drain FAULT output with delay
The ISL6146D and ISL6146E are like the ISL6146A and ISL6146B
respectively, but do not have conduction state reporting via the
fault output.
- Short between any two of the OR-ing FET terminals
- GATE voltage and excessive FET V
- Power-good indicator (ISL6146C)
DS
TABLE 1. KEY DIFFERENCES BETWEEN PARTS IN FAMILY
PART
• MSOP and DFN package options
NUMBER
ISL6146A
ISL6146B
ISL6146C
ISL6146D
ISL6146E
KEY DIFFERENCES
Applications
Separate BIAS and V with Active High Enable
IN
• N+1 industrial and telecom power distribution systems
• Uninterruptable power supplies
Separate BIAS and V with Active Low Enable
IN
• Low voltage processor and memory
• Storage and datacom systems
V
with OVP/UVLO Inputs
IN
ISL6146A without Conduction Monitor and Reporting
ISL6146B without Conduction Monitor and Reporting
+
C
O
M
M
O
N
Q1
+
VIN GATE VOUT
BIAS
ISL6146B
P
O
W
E
GATE FAST OFF, ~200ns FALL TIME
~70ns FROM 20V TO 12.6V ACROSS 57nF
GATE OUTPUT SINKING ~ 6A
VOLTAGE
DC/DC
(3V - 20V)
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
FN7667 Rev 5.00
Aug 17, 2015
Page 1 of 28
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