AN3392 datasheet(26/57 Pages) STMICROELECTRONICS

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Pin description

AN3392

26/57

Doc ID 018749 Rev 1

Pin description

Table 3.

Pin description

(PSSO-36)

Name

Type

Description

Vin

Supply DC input power

7,8,17,18,19,

20,29,31

VOUT

Supply

Boost output voltage, pins 7 and 8 are internally shorted and connected

to pins 29 and 30.

Pins 17 and 18 are internally shorted and connected to pins 19 and 20.

All of the VOUT pins must be connected to the VOUT rail of the PCB.

12,13,24,25

PGND

Ground Power ground to be connected to the ground plane of the PCB.

SGND

Ground Signal ground to be connected to the ground plane of the PCB.

10,11,14,15,

22,23,26,27

LX1…4

Boost inductor connection.

9,16,21,28

CB1…4

I/O

External bootstrap capacitors to be connected between these pins and

LXi.

XCS

Chip select for SPI interface:XCS = HIGH => SPI device is not active

XCS = LOW => SPI device is active

If this pin is left floating an internal resistor pulls the XCS pin up,

switching the SPI off.

SPI_DATA_IN

Input pin for SPI data flow. If not used, this pin should be connected to

ground.

SPI_CLK

Input pin for SPI clock signal. If not used, this pin should be connected to

ground.

VIN_SNS

Sense pin of input voltage. To be biased with a resistor divider between

VIN and SGND.

VIN_SNS_M

Dedicated reference pin for voltage sensing.

2PZ_OUT

I/O

This pin is used to compensate the feedback loop of the output voltage.

A series of resistors and capacitors must be connected to SGND.

3VOUT_SNS

Sense pin of output voltage. To be biased with a resistor divider between

VOUT and SGND.

4OSC_IN

Pin for adjusting the switching frequency. To set the default value (100

kHz) this pin must be tied to VREG, otherwise for adjustment it must be

biased through a resistor to SGND.

5VREG

I/O

Power supply for internal low-voltage circuitry; an external capacitor

must be connected from this pin to the ground plane of the PCB.

SPI_DATA_OUT

Output pin for SPI data flow. If not used, this pin should be left floating.

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