ISL6146 Datasheet, PDF(20/23 Page) Intersil Corporation

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ISL6146 Datasheet, PDF (20/23 Pages) Intersil Corporation – Low Voltage ORing FET Controller

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ISL6146

With VIN present, the ISL6146 will control and enhance Q2 as

expected. When VEXT is applied, Q1 body diode will conduct

when VEXT > VOUT, at which time the ISL6146 VOUT > VIN and will

turn off Q2 and pull the FLT output low. FLT pulling low will

turn-on the P-FET Q1 and the output will have switched from VIN

to VEXT.

When VEXT is removed and ISL6146 VIN > VOUT, Q2 will be turned

on and Q1 turned off as FLT is released to pull high.

The ISL6146 FLT output is not a simple conduction status output,

but is used to report a multitude of faults. Any of these faults will

cause FLT to pull low but VEXT to output will not be interrupted.

VEXT > VIN

UP TO 24V

VIN

3V-20V

VIN GATE VOUT

BIAS

ISL6146B

GND

FLT

ADJ

SWITCHED

OUTPUT

FIGURE 52. ISL6146B EXTERNAL SWITCHOVER SCHEMATIC

REFERENCE DESIGNATOR

ISL6146AEVAL1Z

U1, U2

Q1, Q2, Q11, Q12

R1, 11

R2, R12, R6, R16

R3, R13

R4, R14

R5, R15

R7, R17

C1, C11, C5 C15

C2, C3, C12 C13

C4, C14

TPx

ISL6146BEVAL1Z

U1, U2

Q1, Q11

R4, R14

R1, R10

R2, R12

R3, R13

R5, R15

C1, C11, C5 C15

C2, C3, C12 C13

C4, C14

TPx

VALUE

TABLE 2. ISL6146xEVALZ BOM

DESCRIPTION

66.5kâ¦

4.99kâ¦

10â¦

0â¦

DNP

10kâ¦

100ÂµF

1ÂµF

DNP

ISL6146A ORing FET Controller

30V, 50A FET

RES, SMD, 0603, 1%

Alum. Elect SMD Cap

CAP, SMD, 0603, 50V, 10%

Test Point

Banana Jack

4.99kâ¦

10â¦

0â¦

DNP

10kâ¦

100ÂµF

1ÂµF

DNP

ISL6146B ORing FET Controller

30V, 50A FET

RES, SMD, 0603, 1%

ALum. Elect SMD Cap

CAP, SMD, 0603, 50V, 10%

Test Point

Banana Jack

MANUFACTURER

PART NUMBER

Intersil

Various

Generic

ISL6146AFUZ

Intersil

Various

Generic

ISL6146BFUZ

FN7667.0

December 16, 2011

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