SC283

© 2010 Semtech Corp.

Pin Descriptions

Pin #

Pin Name

Pin Function

1

VINA

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

2

LXA

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

3, 13, T1

GNDA

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

4, 12, T2

GNDB

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

5

CTL3B

Channel B. Control bit 3 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

6

CTL2B

Channel B. Control bit 2 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

7

CTL1B

Channel B. Control bit 1 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

8

CTL0B

Channel B. Control bit 0 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

9

VOUTB

Output voltage sense pin of Channel B.

10

VINB

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

11

LXB

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

14

CTL3A

Channel A. Control bit 3 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

15

CTL2A

Channel A. Control bit 2 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

16

CTL1A

Channel A. Control bit 1 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

17

CTL0A

Channel A. Control bit 0 - see Table 1 for decoding. This pin has a 1 MΩ internal pulldown resistor. This resis-

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

undervoltage lockout.

18

VOUTA

Output voltage sense pin of Channel A.

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