LT8650SPJVPBF datasheet(15/34 Pages) AD

15 / 34 page

LT8650SP

Rev. B

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OPERATION

lected by connecting the VC pin to VCC, which simplifies

the application circuit. External compensation improves

the transient response at the expense of about 50µA more

quiescent current per channel.

Comparators monitoring the FB pin voltage will pull the

corresponding PG pin low if the output voltage varies

more than ±7.5% (typical) from the regulation voltage or

if a fault condition is present.

The voltage present at the TEMP pin is proportional to

the average die temperature of the LT8650SP. The TEMP

pin will be 250mV for a die temperature of 25°C and will

have a slope of 9.5mV/°C

Tracking soft-start is implemented by providing constant

current via the SS pin to an external soft-start capacitor

to generate a voltage ramp. FB voltage is regulated to

the voltage at the SS pin until it exceeds 0.8V; FB is then

regulated to the reference 0.8V. When the SS pin is below

40mV, the corresponding switching regulator will stop

switching. The SS capacitor is reset during shutdown,

VIN1 undervoltage, or thermal shutdown.

Both channels are designed for output currents up to 8A,

but thermal considerations practically limit the output

currents to 4A of continuous current from each channel

simultaneously without a heat sink on the top of the pack-

age. With a heat sink on the top of the package, up to 6A

of continuous current can be supplied by each channel

simultaneously. Channel 1 has a minimum VIN1 require-

ment of 3V, channel 2 can operate with no minimum VIN2

provided the minimum VIN1 has been satisfied.

LT8650SPJVPBF Datasheet(PDF) 15 Page - Analog Devices