LTC4416_15 datasheet(10/12 Pages) LINER

10 / 12 page

LTC4416/LTC4416-1

4416fa

differ by more than 100mV, 100% of the load will come

from the higher of V1 or V2.

The user has the option of using E1 and E2 to disable

one of the two supplies by connecting them to a digital

controller. If E1 is brought low, V1 will no longer supply

current to VS. If E2 is brought high, V2 will no longer sup-

ply current to VS. If E1 is brought low and E2 is brought

high, VS will be disabled.

Figure 5 shows the same application without the shut-

down option. It has one-half the losses of Figure 4 and is

configured for 5V rails.

disabled. This rapid turn-off feature is desirable when the

supply cannot tolerate certain voltage excursions under

load, or when the load is being protected from a rapidly

changing input supply.

Under and Overvoltage Shutdown

Refer to Figure 6 for an application circuit which disables

the power to the load when the input voltage gets too low

or too high. When VIN starts from zero volts, the load to

the output is disabled until VINreaches5.5V.TheV1pathis

enabled and the load remains on the input until the supply

exceeds 13.5V. At that voltage, the V2 path is disabled. As

the input falls, the voltage source will be reconnected to

the load when the input drops to 12V and the V2 path is

enabled. Finally, the load will be removed from the input

supply when the voltage drops below 5V.

APPLICATIO S I FOR ATIO

LTC4416

V2 = 12V

V1 = 12V

Si7483ADP

GND

TO HOST

CONTROLLER

4416 F04

LTC4416

SUPPLY 2

SUPPLY 1

Si7495DP

GND

4416 F05

Figure 4

Figure 5. Dual PowerPath for Current Sharing

LTC4416-1

The LTC4416-1 will support all three of the LTC4416

applications without the “soft-off” feature. The only dif-

ference in the two designs is the LTC4416-1 will rapidly

switch off the load from a supply whenever a channel is

LTC4416-1

GND

R1D

182k

R1C

24.3k

R2C

24.9k

GND

VIN

R2E

187k

VTH1 WITH

HYSTERESIS

VTH2 WITH

HYSTERESIS

VOUT

LOAD

4416 F06

R1A

75k

R2A

221k

UV ENABLED AT 5V, VIN RESTORED TO LOAD WHEN VIN RISES TO 5.5V

OV ENABLED AT 13.5V, VIN RESTORED TO LOAD WHEN VIN FALLS TO 12V

Figure 6

Undervoltage

R A R c

R c

FAIL

ETH

•

1 222

24 3

== 4 99

. V

R A R c R D

R c R D

RESTORE

ETH

(

)

(

)

•

1 222

755

24 3 182

5 497

(

)

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