ISL6146AFRZ-T7A Intersil, ISL6146AFRZ-T7A Datasheet - Page 20

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ISL6146AFRZ-T7A

Manufacturer Part Number
ISL6146AFRZ-T7A
Description
Hot Swap & Power Distribution LW VOLT ORING FET CONTRLR 3X3 8LD DFN
Manufacturer
Intersil
Datasheet

Specifications of ISL6146AFRZ-T7A

Product Category
Hot Swap & Power Distribution
Rohs
yes
Product
Controllers & Switches
Current Limit
6 A
Supply Voltage - Max
20 V
Supply Voltage - Min
1 V
Operating Temperature Range
- 40 C to + 125 C
Mounting Style
SMD/SMT
Package / Case
DFN-8
Input / Supply Voltage (max)
20 V
Input / Supply Voltage (min)
1 V
Number Of Channels
1
Supply Current
25 uA
prevents that when Q1 is on regardless of the V
The ISL6146 bias is pulled from the common drain node to
ensure an always adequate bias from either source when the
other is absent
Figure 51 shows operational scope shots of the above circuit.
V
FIGURE 52. EXTERNAL SUPPLY < BATT SUPPLY DISCONNECTED
BATT
BATT SUPPLY
BATT SUPPLY
EXT SUPPLY
3.3V-20V
3.3V - 24V
FIGURE 50. ISL6146B EXTERNAL SWITCHOVER SCHEMATIC
FIGURE 51. EXTERNAL SUPPLY < BATT SUPPLY CONNECTED
VOUT
V
EXT
GATE
GATE
R1
R2
BIAS
EN
VIN
EXT SUPPLY
Q2
ISL6146B
GATE
GND
VOUT
20
Q1
Q3
VOUT
ADJ
FLT
Use when V
Q3 disconnects V
output when GATE is off.
R3
BATT
BATT
voltage.
SWITCHED
OUTPUT
> V
BATT
EXT
ISL6146
from
All of the scope shots were taken with a 5A load and 100µF of
bulk load capacitance.
Figure 52 is a ISL6146A switchover circuit to use where the
preferred V
this is so, there is no need for a 3rd FET for blocking as in
Figure 50. Additionally, the preferred V
or at a programmed minimum threshold voltage via R1 and R2
divider will turn on Q2/turn-off Q1 but when absent or not
minimally adequate, will do the opposite. In this circuit, with the
ISL6146A not connected to the battery, and thus no constant I
load on it, which allows for longer battery life.
Bias voltage is pulled from the common output to ensure an
always adequate IC bias from either source.
FIGURE 54. EXTERNAL SUPPLY > BATT SUPPLY CONNECTED
V
FIGURE 53. ISL6146A EXTERNAL SWITCHOVER SCHEMATIC
EXT
GATE
V
BATT
EXT
R1
EXT SUPPLY
source is always greater than the V
R2
BIAS
EN
VIN
Q2
ISL6146A
GATE
BATT SUPPLY
GND
Q1
VOUT
ADJ
FLT
EXT
Use when V
source when present
VOUT
BATT
BATT
SWITCHED
OUTPUT
April 26, 2013
. Because
< V
FN7667.4
EXT
VIN

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