PM6670 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'PM6670' PDF : 53 Pages View PDF
Pin settings
2.2
Pin description
PM6670
Table 2. Pin functions
N°
Pin
Function
1
VTTGND LDO Power Ground. Connect to negative terminal of VTT output capacitor.
2
VTTSNS
LDO Remote Sensing. Connect as close as possible to the load via a low
noise PCB trace.
DDR Voltage Selector (if MODE is tied to VCC) or Pulse-Skip/No-Audible
3
DDRSEL Pulse-Skip Selector in Adjustable Mode (MODE voltage lower than 3V). See
Section 7.1.4: Mode-of-operation selection on page 29.
4
VTTREF
Low Noise Buffered DDR Reference Voltage. A 22nF (minimum) ceramic
bypass capacitor is required in order to achieve stability.
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
+5V Supply for internal logic. Connect to +5V rail through a simple RC
filtering network.
High accuracy output Voltage Reference (1.237V) for multilevel pins setting.
7
VREF
It can deliver up to 50µA. Connect a 100nF 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
VDDQ Output Remote Sensing. Discharge path for VDDQ in Non-Tracking
9
VSNS
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 of operation selector. If MODE pin voltage is higher than 4V, the fixed
10
MODE
output mode is selected. If MODE pin voltage is lower than 4V, it is used as
negative input of the error amplifier. See Section 7.1.4: Mode-of-operation
selection on page 29.
11
COMP
DC Voltage Error Compensation Input for the switching section. Refer
Section 7.1.4: Mode-of-operation selection on page 29.
12
DSCG
Discharge Mode Selection. Refer to Section 7.1.8: VDDQ output discharge
on page 33 for Tracking/Non-tracking Discharge or No-Discharge options.
Switching Controller Enable. Connect to S5 system status signal to meet
13
S5
S0-S5 power management states compliance. See Section : Power
management section on page 12
Linear Regulator Enable. Connect to S3 system status signal to meet S0-S5
14
S3
power management states compliance. See Section : Power management
section on page 12
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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