PM6675STR Ver la hoja de datos (PDF) - STMicroelectronics

Número de pieza

componentes Descripción

Fabricante

PM6675STR

High efficiency step-down controller with embedded 2 A LDO regulator

STMicroelectronics 

Pin settings

PM6675S

2.2

Pin description

Table 2. Pin functions

N°

Pin

Function

1

LGND

LDO power ground. Connect to the negative terminal of VTT output

capacitor.

2

LFB

LDO remote sensing. Connect as close as possible to the load via a low

noise PCB trace.

Pulse-Skip/No-Audible Pulse-Skip Modes selector.

3

NOSKIP

See Section 7.1.4: Mode-of-operation selection on page 30

4

LPG

LDO section power-good signal (open drain output). High when LDO output

voltage is within ±10 % of nominal value.

Ground reference for analog circuitry, control logic and VTTREF buffer.

5

SGND

Connect together with the thermal pad and VTTGND to a low impedance

ground plane. See the Application Note for details.

6

AVCC

+5 V supply for internal logic. Connect to +5 V rail through a simple RC

filtering network.

High accuracy output voltage reference (1.237 V) for multilevel pins setting.

7

VREF

It can deliver up to 50 µA. Connect a 100 nF capacitor between VREF and

SGND in order to enhance noise rejection.

Frequency selection. Connect to the central tap of a resistor divider to set

8

VOSC

the desired switching frequency. The pin cannot be left floating. See

Section 7: Device description on page 19 for details.

Switching section output remote sensing and discharge path during output

9

VSNS

soft-end. Connect as close as possible to the load via a low noise PCB

trace.

Fixed output selector and feedback input for the switching controller.

If VSEL pin voltage is higher than 4 V, the fixed 1.5 V output is selected. If

10

VSEL

VSEL pin voltage is lower than 4 V, it is used as negative input of the error

amplifier. See Section 7.1.4: Mode-of-operation selection on page 30 for

details.

11

COMP

DC voltage error compensation input pin for the switching section. Refer to

Section 7.1.4: Mode-of-operation selection on page 30 for more details.

12

LILIM

Current limit selector for the LDO. Connect to SGND for ±1 A current limit or

to +5 V for ±2 A current limit.

13

SWEN

Switching controller enable. When tied to ground, the switching output is

turned off and a soft-end is performed.

14

LEN

Linear regulator enable. When tied to ground, the LDO output is turned off

and a soft-end is performed.

15

SPG

Switching section power good signal (open drain output). High when the

switching regulator output voltage is within ±10 % of nominal value.

16

PGND

Power ground for the switching section.

17

LGATE Low-side gate driver output.

18

VCC

+5 V low-side gate driver supply. Bypass with a 100 nF capacitor to PGND.

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