PM6670AS(2008) 查看數據表（PDF） - STMicroelectronics
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PM6670AS Datasheet PDF : 54 Pages
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Pin settings
PM6670AS
2.2
Pin description
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 3 V).
See Mode of Operation Selection section for details.
4
VTTREF
Low Noise Buffered DDR Reference Voltage. A 22 nF (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
+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 Device
Description section for details.
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 4 V, the fixed
10
MODE
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.
Switching controller enable. Connect to S5 system status signal to meet S0-
13
S5
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
14
S3
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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