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PM6670AS Datasheet(PDF) 6 Page - STMicroelectronics |
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PM6670AS Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 54 page  Pin settings PM6670AS 6/54 2.2 Pin description Table 2. Pin functions N° Pin Function 1 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. 9 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. 10 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. 11 COMP DC Voltage Error Compensation Input for the switching section. Refer to Mode of Operation Selection section for more details. 12 DSCG Discharge Mode Selection. Refer to Output Discharge Selection section for Tracking/Non-tracking Discharge or No-Discharge options. 13 S5 Switching controller enable. Connect to S5 system status signal to meet S0- S5 power management states compliance. See Power Management Pins section for details. 14 S3 Linear regulator enable. Connect to S3 system status signal to meet S0-S5 power management states compliance. See Power Management Pins section for details. 15 PG Power-Good signal (open drain output). High when VDDQ output voltage is within ±10 % of nominal value. 16 PGND Power ground for the switching section. 17 LGATE Low-side gate driver output. |
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