参数资料
型号: PM6670STR
厂商: STMICROELECTRONICS
元件分类: 稳压器
英文描述: 3 A SWITCHING CONTROLLER, QCC24
封装: 4 X 4 MM, LEAD FREE, VFQFPN-24
文件页数: 28/54页
文件大小: 742K
代理商: PM6670STR
Device description
PM6670S
34/54
Doc ID 14432 Rev 4
7.1.8
VDDQ output discharge
Active discharge of VDDQ output occurs when PM6670S enters the suspend-to-disk system
state (S3 and S5 tied to GND) and DSCG pin has been properly set.
Figure 39.
DSCG pin connection for discharge mode selection
The PM6670S allows the user to choose between fast discharge (tracking discharge), soft
discharge (non-tracking discharge) or no discharge modes. Voltage on DSCG multilevel pin
determines discharge mode as shown in Table 9 on page 34.
Tracking discharge allows the fastest discharge of all outputs but requires the LDOIN to be
self-supplied from VDDQ output voltage. When an external supply rail is connected to
LDOIN, it must be taken into account to avoid damage to the device. Discharge current (1 A)
flows through the LDOIN pin until the output has reached approximately 400 mV and then a
soft discharge completes the process by discharging the output with an internal 22
Ω switch.
Figure 40.
Fast discharge and soft discharge options
Table 9.
Discharge mode selection
DSCG voltage
Soft-End type
Description
VDSCG > 4.2 V
No discharge
All outputs left floating.
1 V< VDSCG < 3.5 V
Fast (tracking)
VDDQ and VTT actively discharged by LDO trough
LDOIN and VTT pins;
VDSCG < 0.5 V
Soft (non-tracking)
All outputs discharged by dedicated internal MOS.
PM6670
DSCG
+5V
VREF
PM6670
DSCG
+5V
VREF
PM6670S
VDDQ
VTT
400mV
Fast discharge
VDDQ
VTT
Soft discharge
VDDQ
VTT
400mV
Fast discharge
VDDQ
VTT
Soft discharge
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