PM6670AS STMicroelectronics, PM6670AS Datasheet - Page 33

• Manufacturer Part Number: PM6670AS
• Description: IC CTLR DDR2/3 MEM PS VFQFPN-24
• Manufacturer: STMicroelectronics

Specifications of PM6670AS

• Applications: Memory, DDR2/DDR3 Regulator
• Current - Supply: 800µA
• Voltage - Supply: 4.5 V ~ 28 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 24-VFQFN, 24-VFQFPN
• For Use With: 497-8412 - BOARD EVAL PM6670AS DDR2/3497-8411 - BOARD EVAL PM6670S DDR2/3
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PM6670AS
7.1.7
7.1.8
Power-Good signal
The PG pin is an open drain output used to monitor output voltage through VSNS (in fixed
output voltage mode) or MODE (in adjustable output voltage mode) pins and is enabled
after the soft-start timer has expired. PG signal is held low if the VDDQ output voltage drops
10% below or rises 10% above the nominal regulated value. The PG output can sink current
up to 4 mA.
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 9.
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.
1V< VDSCG <3.5V
DSCG voltage
VDSCG >4.2V
VDSCG <0.5V
Discharge mode selection
V
V
REF
REF
Soft (non-tracking)
Soft-end type
Fast (tracking)
No discharge
+5V
+5V
Doc ID 14436 Rev 2
DSCG
DSCG
PM6670
PM6670
Table 2 on page 6
PM6670AS
All outputs left floating.
VDDQ and VTT actively discharged by LDO trough
LDOIN and VTT pins;
All outputs discharged by dedicated internal MOS.
.
Description
Device description
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