PM6670AS datasheet(6/54 Pages) STMICROELECTRONICS

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Pin settings

PM6670AS

6/54

2.2

Pin description

Table 2.

Pin functions

N°

Function

VTTGND

LDO Power Ground. Connect to negative terminal of VTT output capacitor.

2VTTSNS

LDO Remote Sensing. Connect as close as possible to the load via a low

noise PCB trace.

3DDRSEL

DDR Voltage Selector (if MODE is tied to VCC) or Pulse-Skip/No-Audible

Pulse-Skip Selector in Adjustable Mode (MODE voltage lower than 3 V).

See Mode of Operation Selection section for details.

4VTTREF

Low Noise Buffered DDR Reference Voltage. A 22 nF (minimum) ceramic

bypass capacitor is required in order to achieve stability.

5SGND

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

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

ground plane. See the Application Note for details.

6AVCC

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

filtering network.

7VREF

High accuracy output Voltage Reference (1.237 V) for multilevel pins setting.

It can deliver up to 50

µA. Connect a 100 nF capacitor between VREF and

SGND in order to enhance noise rejection.

8VOSC

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

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

Description section for details.

VSNS

VDDQ Output Remote Sensing. Discharge path for VDDQ in Non-Tracking

Discharge. Input for internal resistor divider that provides VDDQ/2 to

VTTREF and VTT. Connect as close as possible to the load via a low noise

PCB trace.

MODE

Mode of operation selector. If MODE pin voltage is higher than 4 V, the fixed

output mode is selected. If MODE pin voltage is lower than 4 V, it is used as

negative input of the error amplifier. See Mode of Operation Selection

section for details.

COMP

DC Voltage Error Compensation Input for the switching section. Refer to

Mode of Operation Selection section for more details.

DSCG

Discharge Mode Selection. Refer to Output Discharge Selection section for

Tracking/Non-tracking Discharge or No-Discharge options.

Switching controller enable. Connect to S5 system status signal to meet S0-

S5 power management states compliance. See Power Management Pins

section for details.

Linear regulator enable. Connect to S3 system status signal to meet S0-S5

power management states compliance.

See Power Management Pins section for details.

Power-Good signal (open drain output). High when VDDQ output voltage is

within ±10 % of nominal value.

PGND

Power ground for the switching section.

LGATE

Low-side gate driver output.

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