SC284P datasheet(12/22 Pages) SEMTECH

12 / 22 page

SC284P

Pin Descriptions

Pin #

Pin Name

Pin Function

PVINA

Channel A — Input supply voltage for the converter power stage and internal circuitry.

AGNDA

Ground connection for internal circuitry — connect directly to PGNDA.

AVINA

Power supply for internal circuitry — must be connected to PVINA using an R-C filter of Ω and 0nF.

PGOODA

Power Good indicator for channel A. When the output voltage reaches the PGOODA threshold, this pin will be

open drain (after the PGOOD delay), otherwise it is pulled low internally.

CTL0A

Channel A — Control bit 0, see Table for decoding. This pin has a MΩ internal pull-down resistor. This resis-

tor is switched in circuit whenever the pin voltage is below the input high threshold, or when the part is in

under-voltage lockout.

CTLA

Channel A — Control bit , see Table for decoding. This pin has a MΩ internal pull-down resistor. This resis-

tor is switched in circuit whenever the pin voltage is below the input high threshold, or when the part is in

under-voltage lockout.

CTL2A

Channel A — Control bit 2, see Table for decoding. This pin has a MΩ internal pull-down resistor. This resis-

tor is switched in circuit whenever the pin voltage is below the input high threshold, or when the part is in

under-voltage lockout.

VOUTB

Output voltage sense pin of Channel B

PGNDB

Channel B — Ground connection for converter power stage and internal circuitry.

LXB

Switching node of Channel B — connect an inductor between this pin and the output capacitor.

PVINB

Channel B — Input supply voltage for the converter power stage and internal circuitry.

AGNDB

Ground connection for internal circuitry — connect directly to PGNDB.

AVINB

Power supply for internal circuitry — must be connected to PVINB using an R-C filter of Ω and 0nF.

PGOODB

Power Good indicator for channel B. When the output voltage reaches the PGOODB threshold, this pin will be

open drain (after the PGOOD delay), otherwise it is pulled low internally.

CTL0B

Channel B — Control bit 0, see Table for decoding. This pin has a MΩ internal pulld-own resistor. This resis-

tor is switched in circuit whenever the pin voltage is below the input high threshold, or when the part is in

under-voltage lockout.

CTLB

Channel B — Control bit - see Table for decoding. This pin has a MΩ internal pull-down resistor. This

resistor is switched in circuit whenever the pin voltage is below the input high threshold, or when the part is

in under-voltage lockout.

CTL2B

Channel B — Control bit 2, see Table for decoding. This pin has a MΩ internal pull-down resistor. This resis-

tor is switched in circuit whenever the pin voltage is below the input high threshold, or when the part is in

under-voltage lockout.

VOUTA

Output voltage sense pin of Channel A

PGNDA

Channel A — Ground connection for converter power stage and internal circuitry.

LXA

Switching node of Channel A — connect an inductor between this pin and the output capacitor.

PAD

Thermal pad for heatsinking purposes.

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