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Linear Technology Electronic Components Datasheet

LTC4417CUF Datasheet

Prioritized PowerPath Controller

No Preview Available !

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
2A
OUTPUT
806k
39.2k
60.4k
V1 VS1 G1
UV1
OV1
V2
1.05M
UV2
31.6k
OV2
68.1k
V3
698k
UV3
16.9k
OV3
49.9k
VS2 G2
LTC4417
GND
VS3 G3
VOUT
VALID1
VALID2
VALID3
1M 1M 1M
EN
SHDN
HYS
CAS
4417 TA01a
Priority Switching from 12V V1 to 14.8V V2
V2 14.8V
12V
V1
2V/DIV
V3 = 0V, IL = 2A
CL = 120µF
VOUT
V1 UV FAULT
50ms/DIV
4417 TA01b
4417f
1


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
25
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
2


Part Number LTC4417CUF
Description Prioritized PowerPath Controller
Maker Linear
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