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LTC4416/LTC4416-1

4416fa

OPERATIO

The band-gap reference provides internal bias currents

used by the channel 1 and channel 2 controllers. It also

provides a precision voltage reference, VREF,usedbycom-

parators C1 and C2. The band-gap reference is powered

as long as a minimum operational voltage is present on

either V1, V2, or VS.

The C1 and C2 comparators provide a fixed comparison

between the E1 and E2 inputs, respectively, and the in-

ternal VREF signal. The comparator outputs are directly

represented by the H1 and H2 open-drain outputs. The

output states of H1 and H2 are not dependent upon

the relative voltage difference between VV1 – VVS and

VV2 – VVS, respectively. If VE1 is less than VREF, the H1

open-drain output will be low impedance to GND. If VE2

is less than VREF, the H2 open-drain output will be low

impedance to GND.

The A1 and A2 circuits act both as a high side

transconductance amplifiers and as comparators. Both

A1 and A2 act identically when the analog controllers

are fully enabled. The relationship of the G1 current is

represented by Figure 1.

When VV1 – VVS < VRTO, the A1 activates the reverse turn-

off condition and the IG1 current is IG(OFF). When VRTO <

VV1 – VVS < VFR, the A1 acts as a class A output and the

IG1 current is fixed at IG(SRC). As the VV1 – VVS voltage

VV1 – VVS

4416 F01

IG1

VRTO

VFR

VFON

IGFON(SNK)

IG(SNK)

IG(SRC)

IG(OFF)

NOT DRAWN TO SCALE

Figure 1. IG1 vs VV1 – VVS

approachestheforwardregulationvoltage,VFR,theIG(SNK)

current will be proportional to VV1 – VVS. When VV1 – VVS

> VFON, the A1 activates the fast-on condition, tG(ON), and

the IG1 current is set to IGFON(SNK).

LTC4416 OPERATION

The interaction of the LTC4416 analog controllers distin-

guish the operation of the LTC4416 from a simple circuit

using two PowerPath controllers. Table 1 explains the

different operation modes of the analog controllers.

Table 1. LTC4416 Operational Modes

Operation Mode

IG(OFF)1

IG(OFF)2

Load Sharing

Enabled

Sense V1 is Less Than V2

Enabled

Sense

V1 is Greater Than V2

Enabled

Channel 1 Disabled.

Do Not Use

Disabled

Channel 2 Disabled.

Do Not Use

Disabled

Both Channels Disabled

Disabled

The LTC4416 has six modes of operation. Each mode of

operation is dependent upon the configuration of the E1

and E2 input pins.

Load Sharing Operation

The load sharing mode configures the LTC4416 into two

independent PowerPath controllers. This is accomplished

by fully enabling both the first analog controller and the

second analog controller. Both channels will implement

the gate drive outlined in Figure 1.

V1 is Less Than V2 Operation

Channel 1 is fully enabled. If VV1 – VVS < VRTO, channel 1

will implement all of the IG1 currents listed in Figure 1.

When VE2 is above the VREF threshold, channel 2 is in a

“soft-off mode”. This means that G2 will only provide an

IG(SRC) current instead of either an IG(SRC) or an IG(OFF)

current.

When VE2 is below the VREF threshold, channel 2 is fully

enabled, and G2 will become active implementing the IG

output current listed in Figure 1.

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