STEVAL-ISA050V1 [STMICROELECTRONICS]

Monolithic VR for chipset and DDR2/3 demonstration board based on the PM6641; 基于PM6641整体VR的芯片组和DDR2 / 3演示板


型号：	STEVAL-ISA050V1
厂家：	ST
描述：	Monolithic VR for chipset and DDR2/3 demonstration board based on the PM6641 基于PM6641整体VR的芯片组和DDR2 / 3演示板双倍数据速率
文件：	总4页 (文件大小：158K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

STEVAL-ISA050V1

Monolithic VR for chipset and DDR2/3 demonstration board

based on the PM6641

Data Brief

Features

■ Switching section

– 0.8 V 1% voltage reference

– 2.7 V to 5.5 V input voltage range

– Fast response, constant frequency, current

mode control

– Three independent, adjustable, SMPS For

DDR2/3 (VDDQ) and chipset supply

– S3-S5 states compliant DDR2/3 section

– Active soft-end for all outputs

– Selectable tracking discharge for VDDQ

– Separate Power Good signals

– Pulse skipping at light load

STEVAL-ISA050V1

– Programmable current limit and soft-start

for all outputs

– Latched OVP, UVP protection

– Thermal protection

15 mA low noise buffered reference. Each

regulator is provided of basic under voltage (UV)

and over voltage (OV) protections, programmable

soft-start and current limit, active soft-end and

pulse-skipping at light loads.

■ Reference and termination voltages (VTTREF

and VTT)

–

2 Apk LDO for DDR2/3 termination (VTT)

with fold back

– Remote VTT output sensing

– High-Z VTT output in S3

–

15 mA low noise DDR2/3 buffered

reference (VTTREF)

Application

■ Supply for ultra-mobile PC (UMPC)

Description

The STEVAL-ISA050V1 demonstration board is

based on the PM6641, that is a monolithic voltage

regulator module, with internal Power MOSFET,

specifically designed to supply DDR2/3 memory

and chipset in ultra-mobile PC and real estate

portable systems. It integrates three independent,

adjustable, constant frequency buck converters, a

2 Apk low drop-out (LDO) linear regulator and a

November 2008

Rev 1

1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

Circuit schematic

STEVAL-ISA050V1

Circuit schematic

Figure 1.

Schematic

8 S 1 _ N E

3 _ D N G D A

1 H P _ T E S E

2 _ D N G D A

C C V A

8 S 1 _ _ 1 G P

7 3

8 3

9 3

0 4

1 4

2 4

3 4

4 4

5 4

6 4

7 4

8 4

4 2

3 2

2 2

1 2

0 2

9 1

8 1

7 1

6 1

5 1

4 1

3 1

5 0 S 1 _ _ 1 G P

2 _ 5 0 S 1 _ 1 N I

1 _ 5 0 S 1 _ 1 N I

2 _ 5 0 _ 2 S 1 _ W S V

1 _ 5 0 _ 1 S 1 _ W S V

2 _ 5 0 S 1 _ 1 D N N G D S

1 _ 5 0 S 1 _ 1 D N N G D S

5 0 S 1 _ _ 1 B F V

D N G _ T T V

T T V

N I _ O D L

F E R T T V

G C S D

B F _ T T V

C C V

5 0 S 1 _ P M O C

5 0 S 1 _ S S

8 S 1 _ S S

C C V A V

AM03286v1

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STEVAL-ISA050V1

Revision history

Table 1.

Date

12-Nov-2008

Document revision history

Revision

Changes

Initial release.

3/4

STEVAL-ISA050V1

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STEVAL-ISA050V1 [STMICROELECTRONICS]

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