ISL6146 Datasheet, PDF (1/23 Pages) Intersil Corporation – Low Voltage ORing FET Controller

Low Voltage ORing FET Controller
ISL6146
The ISL6146 represents a family of ORing MOSFET controllers
capable of ORing voltages from 1V to 18V. Together with
suitably sized N-channel power MOSFETs, the ISL6146
increases power distribution efficiency when replacing a power
ORing 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.
TABLE 1. KEY DIFFERENCES BETWEEN PARTS IN FAMILY
PART NUMBER
KEY DIFFERENCES
ISL6146A Separate BIAS and VIN with Active High Enable
ISL6146B Separate BIAS and VIN with Active Low Enable
ISL6146C VIN with OVP/UVLO Inputs
Features
• ORing Down to 1V and Up to 20V with ISL6146A, ISL6146B
• 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 ORing 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
+
VOLTAGE
DC/DC
(3V - 20V)
-
VIN GATE VOUT
BIAS
ADJ
ISL6146B
FLT
GND ^EN
+C
O
M
M
O
N
P
O
W
E
R
B
U
S
Q2
+C
O
+
M
M
O
N
VOLTAGE
DC/DC
(3V - 20V)
VIN GATE VVOOUUTT
BIAS
ADJ
ISL6146B
P
O
W
E
FLT
R
GND ^EN
B
U
S
-
FIGURE 1. TYPICAL APPLICATION
GATE FAST OFF, ~200ns FALL TIME
~70ns FROM 20V TO 12.6V ACROSS 57nF
GATE OUTPUT SINKING ~ 6A
FIGURE 2. ISL6146 GATE HIGH CURRENT PULL-DOWN
December 16, 2011
1
FN7667.0
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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