DATASHEET
ISL6146
FN7667
Rev 5.00
Low Voltage OR-ing FET Controller
Aug 17, 2015
The ISL6146 represents a family of OR-ing MOSFET controllers
Features
capable of OR-ing voltages from 1V to 18V. Together with suitably
OR-ing down to 1V and up to 20V with ISL6146A, ISL6146B,
sized N-channel power MOSFETs, the ISL6146 increases power
distribution efficiency when replacing a power OR-ing diode in high ISL6146D and ISL6146E
current applications. It provides gate drive voltage for the
Programmable voltage compliant operation with ISL6146C
MOSFET(s) with a fully integrated charge pump.
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 <0.3s turn-off in
V - V trip point, which adjusts the control sensitivity to system
OUT IN
response to shorts on sourcing supply
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
The ISL6146A and ISL6146B are optimized for very low voltage current
operation, down to 1V with an additional independent bias of 3V
Very smooth switching transition
or greater.
Internal charge pump to drive N-channel MOSFET
The ISL6146C provides a voltage compliant mode of operation
User programmable V - V Vth for noise immunity
down to 3V with programmable undervoltage lock out and
IN OUT
overvoltage protection threshold levels.
Open-drain FAULT output with delay
The ISL6146D and ISL6146E are like the ISL6146A and ISL6146B
- Short between any two of the OR-ing FET terminals
respectively, but do not have conduction state reporting via the
- GATE voltage and excessive FET V
DS
fault output.
- Power-good indicator (ISL6146C)
TABLE 1. KEY DIFFERENCES BETWEEN PARTS IN FAMILY
MSOP and DFN package options
PART
NUMBER KEY DIFFERENCES
Applications
ISL6146A Separate BIAS and V with Active High Enable
N+1 industrial and telecom power distribution systems
IN
ISL6146B Separate BIAS and V with Active Low Enable Uninterruptable power supplies
IN
Low voltage processor and memory
ISL6146C V with OVP/UVLO Inputs
IN
Storage and datacom systems
ISL6146D ISL6146A without Conduction Monitor and Reporting
ISL6146E ISL6146B without Conduction Monitor and Reporting
+
C
Q1
O
+ M
M
O
N
VIN GATE VOUT
P
GATE FAST OFF, ~200ns FALL TIME
VOLTAGE
BIAS
ADJ
O
DC/DC
~70ns FROM 20V TO 12.6V ACROSS 57nF
W
ISL6146B
(3V - 20V)
E
GATE OUTPUT SINKING ~ 6A
FLT
R
B
EN
GND
U
S
-
+ C
Q2
O
M
+
M
O
N
VIN GATE VOUT
VOUT
P
VOLTAGE BIAS
ADJ O
DC/DC
W
ISL6146B
(3V - 20V)
E
FLT
R
B
EN
GND
U
S
-
FIGURE 1. TYPICAL APPLICATION FIGURE 2. ISL6146 GATE HIGH CURRENT PULL-DOWN
FN7667 Rev 5.00 Page 1 of 28
Aug 17, 2015ISL6146
Table of Contents
Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin Descriptions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Thermal Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Recommended Operating Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Typical Performance Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Functional Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Applications Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Power-up Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Typical Applications Circuits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
ISL6146 Evaluation Platforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Description and Use of the Evaluation Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Revision History. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
About Intersil . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Package Outline Drawing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
L8.3x3J . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
M8.118 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
FN7667 Rev 5.00 Page 2 of 28
Aug 17, 2015