PM6641 STMicroelectronics, PM6641 Datasheet - Page 2

IC MONO VR DDR2/3 PC VFQFPN-48

PM6641

Manufacturer Part Number
PM6641
Description
IC MONO VR DDR2/3 PC VFQFPN-48
Manufacturer
STMicroelectronics
Datasheet

Specifications of PM6641

Applications
Converter, DDR2, DDR3
Voltage - Input
2.7 ~ 5.5 V
Number Of Outputs
3
Voltage - Output
0.8 ~ 5.5 V
Operating Temperature
0°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
48-VFQFN
Output Voltage
0.9 V
Output Current
3 A
Input Voltage
2.7 V to 5.5 V
Switching Frequency
1000 KHz
Operating Temperature Range
- 40 C to + 125 C
Mounting Style
SMD/SMT
For Use With
497-8425 - KIT EVAL PM6641 CHIPSET/DDR2/3
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

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Contents
Contents
1
2
3
4
5
6
7
2/47
Typical application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
Electrical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.1
3.2
3.3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Device description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
SW regulators control loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
SW regulators pulse skipping and PWM mode . . . . . . . . . . . . . . . . . . . . 25
Output voltage divider . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Outputs soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Outputs soft-end . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Peak current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Fault management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Memory supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
7.1.1
7.1.2
7.1.3
7.1.4
Chipset supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Switching frequency selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Phase management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
VTT LDO and VTTREF buffered reference . . . . . . . . . . . . . . . . . . . . . . 20
VTT and VTTREF soft-start . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
S3 and S5 power management pins . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
VDDQ switching regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Doc ID 13510 Rev 3
PM6641

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