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PM6670AS 数据表(PDF) 34 Page - STMicroelectronics

部件名 PM6670AS
功能描述  Complete DDR2/3 memory power supplies controller
PDF  54 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6670AS 数据表(HTML) 34 Page - STMicroelectronics

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Device description
PM6670AS
34/54
7.1.8
VDDQ output discharge
Active discharge of VDDQ output occurs when PM6670AS enters the Suspend-To-Disk
system state (S3 and S5 tied to GND) and DSCG pin has been properly set.
Figure 37. DSCG pin connection for discharge mode selection
The PM6670AS 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 2 on page 6.
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 38. Fast discharge and soft discharge options
Table 2. Discharge mode selection
DSCG voltage
Soft-end type
Description
VDSCG >4.2V
No Discharge
All outputs left floating.
1V< VDSCG <3.5V
Fast (Tracking)
VDDQ and VTT actively discharged by LDO trough
LDOIN and VTT pins;
VDSCG <0.5V
Soft (Non-Tracking)
All outputs discharged by dedicated internal MOS.
PM6670
DSCG
+5V
VREF
PM6670
DSCG
+5V
VREF
PM6670AS
VDDQ
VTT
400mV
Fast discharge
VDDQ
VTT
Soft discharge
Soft discharge
VDDQ
VTT
400mV
Fast discharge
VDDQ
VTT
Soft discharge
Soft discharge



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