PM6670ASTR STMicroelectronics, PM6670ASTR Datasheet - Page 6

• Manufacturer Part Number: PM6670ASTR
• Description: IC CTLR DDR2/3 MEM PS 24VFQFPN
• Manufacturer: STMicroelectronics

Specifications of PM6670ASTR

• Applications: Memory, DDR2/DDR3 Regulator
• Current - Supply: 800µA
• Voltage - Supply: 4.5 V ~ 36 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
• Other names: 497-6305-2; PM6670ATR

Pin settings
2.2
6/53
Pin description
Table 2.
N°
10
11
12
13
14
15
16
17
1
2
3
4
5
6
7
8
9
VTTGND
DDRSEL
VTTSNS
VTTREF
LGATE
MODE
COMP
SGND
DSCG
PGND
VOSC
AVCC
VREF
VSNS
Pin
Pin functions
PG
S5
S3
LDO power ground. Connect to negative terminal of VTT output capacitor.
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
pulse-skip selector in adjustable mode (MODE voltage lower than 3 V). See
Mode of Operation Selection section for details.
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.
Connect together with the thermal pad and VTTGND to a low impedance
ground plane. See the Application Note for details.
+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.
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
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
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
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.
DC voltage error compensation input for the switching section. Refer to
Mode of Operation Selection section for more details.
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-
S5 power management states compliance. See Power Management Pins
section for details. S5 pin can't be left floating.
Linear regulator enable. Connect to S3 system status signal to meet S0-S5
power management states compliance.
See Power Management Pins section for details. S3 pin can't be left floating.
Power-Good signal (open drain output). High when VDDQ output voltage is
within ±10% of nominal value.
Power ground for the switching section.
Low-side gate driver output.
Doc ID 14436 Rev 2
Function
PM6670AS