Linear Technology Electronic Components Datasheet

LTC4417CUF Datasheet

Prioritized PowerPath Controller

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Features

n Selects Highest Priority Supply from Three Inputs

n Blocks Reverse and Cross Conduction Currents

n Wide Operating Voltage Range: 2.5V to 36V

n –42V Protection Against Reverse Battery

Connection

n Fast Switchover Minimizes Output Voltage Droop

n Low 28µA Operating Current

n <1µA Current Draw from Supplies Less than VOUT

n 1.5% Input Overvoltage/Undervoltage Protection

n Adjustable Overvoltage/Undervoltage Hysteresis

n P-Channel MOSFET Gate Protection Clamp

n Cascadable for Additional Input Supplies

n 24-Lead Narrow SSOP and 4mm × 4mm QFN

Packages

Applications

n Industrial Handheld Instruments

n High Availability Systems

n Battery Backup Systems

n Servers and Computer Peripherals

LTC4417

Prioritized PowerPath™

Controller

Description

The LTC®4417 connects one of three valid power supplies

to a common output based on priority. Priority is defined

by pin assignment, with V1 assigned the highest priority

and V3 the lowest priority. A power supply is defined as

valid when its voltage has been within its overvoltage (OV)

and undervoltage (UV) window continuously for at least

256ms. If the highest priority valid input falls out of the

OV/UV window, the channel is immediately disconnected

and the next highest priority valid input is connected to the

common output. Two or more LTC4417s can be cascaded

to provide switchover between more than three inputs.

The LTC4417 incorporates fast non-overlap switching

circuitry to prevent both reverse and cross conduction

while minimizing output droop. The gate driver includes

a 6V clamp to protect external MOSFETs. A controlled

output ramp feature minimizes start-up inrush current.

Open drain VALID outputs indicate the input supplies have

been within their OV/UV window for 256ms.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

PowerPath, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

Typical Application

V1: 12V

WALL ADAPTER

IRF7324

V2: 14.8V Li-Ion

MAIN/SWAPPABLE

IRF7324

V3: 12V SLA

BACKUP

IRF7324

OUTPUT

806k

39.2k

60.4k

V1 VS1 G1

UV1

OV1

1.05M

UV2

31.6k

OV2

68.1k

698k

UV3

16.9k

OV3

49.9k

VS2 G2

LTC4417

GND

VS3 G3

VOUT

VALID1

VALID2

VALID3

1M 1M 1M

SHDN

HYS

CAS

4417 TA01a

Priority Switching from 12V V1 to 14.8V V2

V2 14.8V

12V

2V/DIV

V3 = 0V, IL = 2A

CL = 120µF

VOUT

V1 UV FAULT

50ms/DIV

4417 TA01b

4417f

Linear Technology Electronic Components Datasheet

LTC4417CUF Datasheet

Prioritized PowerPath Controller

No Preview Available !

LTC4417

Absolute Maximum Ratings (Notes 1, 2)

Supply Voltages

V1, V2, V3................................................ –42V to 42V

VOUT, VS1, VS2, VS3............................... –0.3V to 42V

Voltage from V1, V2, V3 to VOUT.................. –84V to 42V

Voltage from VS1, VS2, VS3 to

G1, G2, G3...................................................–0.3V to 7.5V

Input Voltages

EN, SHDN............................................... –0.3V to 42V

OV1, OV2, OV3, UV1, UV2, UV3................ –0.3V to 6V

HYS.......................................................... –0.3V to 1V

Input Currents

OV1, OV2, OV3, UV1, UV2, UV3, HYS................ –3mA

Output Voltages

VALID1, VALID2, VALID3......................... –0.3V to 42V

CAS........................................................... –0.3V to 6V

Output Currents

VALID1, VALID2, VALID3, CAS..............................2mA

Operating Ambient Temperature Range

LTC4417C................................................. 0°C to 70°C

LTC4417I..............................................–40°C to 85°C

LTC4417H........................................... –40°C to 125°C

Storage Temperature Range................... –65°C to 150°C

Lead Temperature

GN Package (Soldering, 10 sec)......................... 300°C

Pin Configuration

TOP VIEW

EN 1

SHDN 2

HYS 3

UV1 4

OV1 5

UV2 6

OV2 7

UV3 8

OV3 9

VALID1 10

VALID2 11

VALID3 12

24 V1

23 V2

22 V3

21 VS1

20 G1

19 VS2

18 G2

17 VS3

16 G3

15 VOUT

14 CAS

13 GND

GN PACKAGE

24-LEAD NARROW PLASTIC SSOP

TJMAX = 150°C, θJA = 85°C/W, θJC = 30°C/W

UV1 1

OV1 2

UV2 3

OV2 4

UV3 5

OV3 6

24 23 22 21 20 19

18 VS1

17 G1

16 VS2

15 G2

14 VS3

13 G3

7 8 9 10 11 12

UF PACKAGE

24-LEAD (4mm × 4mm) PLASTIC QFN

TJMAX = 150°C, θJA = 47°C/W, θJC = 4.5°C/W

EXPOSED PAD (PIN 25) PCB GND CONNECTION OPTIONAL

Order Information

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

TEMPERATURE RANGE

LTC4417CGN#PBF

LTC4417CGN#TRPBF LTC4417GN

24-Lead Narrow Plastic SSOP

0°C to 70°C

LTC4417IGN#PBF

LTC4417IGN#TRPBF

LTC4417GN

24-Lead Narrow Plastic SSOP

–40°C to 85°C

LTC4417HGN#PBF

LTC4417HGN#TRPBF LTC4417GN

24-Lead Narrow Plastic SSOP

–40°C to 125°C

LTC4417CUF#PBF

LTC4417CUF#TRPBF

4417

24-Lead (4mm × 4mm) Plastic QFN

0°C to 70°C

LTC4417IUF#PBF

LTC4417IUF#TRPBF

4417

24-Lead (4mm × 4mm) Plastic QFN

–40°C to 85°C

LTC4417HUF#PBF

LTC4417HUF#TRPBF 4417

24-Lead (4mm × 4mm) Plastic QFN

–40°C to 125°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to: http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/

4417f

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LTC4417CUF Datasheet

Prioritized PowerPath Controller

LTC4417CUF Datasheet

Prioritized PowerPath Controller

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