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LTC4416/LTC4416-1

4416fa

V1 is Greater Than V2 Operation

When VE1 is below the VREF threshold, channel 1 is in

a “soft-off mode”. This means that G1 will only provide

an IG(SRC) current instead of an IG(SNK) or an IGFON(SNK)

current.

When VE1 is above the VREF threshold, channel 1 is im-

mediately fully enabled, and G1 will become active imple-

menting the output current listed in Figure 1.

Channel 2 is fully enabled. If VV1 – VVS < VRTO, channel 2

will implement all of the IG2 currents listed in Figure 1.

Channel 1 is Disabled

The LTC4416 is not designed to have channel 1 disabled

by grounding E1 and leaving E2 in an indeterminate state.

If this happens, the channel 2 PowerPath controller will

not have reverse turn-off capability. No electrical harm to

the LTC4416 will occur.

Channel 2 is Disabled

The LTC4416 is not designed to have channel 2 disabled

by connecting E2 high and leaving E1 in an indeterminate

state. If this happens, the channel 1 PowerPath controller

will not have reverse turn-off capability. No electrical harm

to the LTC4416 will occur.

Both Channels Disabled

When both channels of the LTC4416 are disabled, both

G1 and G2 currents are set to IG(SRC).

LTC4416-1 OPERATION

The LTC4416-1 is designed for overvoltage/undervoltage

protection or when either voltage path must be turned off

rapidly, regardless of the status of the other voltage input.

The LTC4416-1 does not implement the soft-off feature

implemented in the LTC4416. The E1 and E2 inactive will

force the IG current of their respective channel to IG(OFF).

Table 2 explains the operation of the E1 and E2 inputs.

The term “active” implies that IG(OFF) current is forced on

the Gn pins regardless of the VVn – VVS value. The term

“enabled” implies that IG(OFF) current is provide on the Gn

pins if and only if VVn – VVS < VRTO.

Table.2 LTC4416-1 Operational Modes

E2 Operation Mode

IG(OFF)1

IG(OFF)2

Undervoltage Protection

Active

Overvoltage Protection

Active

Channel 1 PowerPath

Enabled

Channel 2 PowerPath

Enabled

LTC4416

The LTC4416 is designed to support three major ap-

plications. The first two applications assume that V1 is

the primary power source and V2 is the backup power

source. The first application is where the V1 power supply

is normally less than V2. The second application is where

the V1 power supply is normally greater than V2. The third

application addresses the load sharing case where both

V1 and V2 are relatively equal in value.

V1 is Less Than V2

Figure 2 illustrates the external resistor configuration for

this case.

Figure 2

OPERATIO

APPLICATIO S I FOR ATIO

LTC4416

PRIMARY SUPPLY

BACKUP SUPPLY

V2 = 14.4V

V1 = 9V (FAIL)

V1 = 10.8V (RESTORE)

SUP75P03_07

GND

R2E

105k

R2C

24.9k

R2A

158k

GND

4416 F02

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