STEVAL-ISA051V1 [STMICROELECTRONICS]

Complete DDR2/3 memory power supply controller evaluation board based on the PM6670S; 完整的DDR2 / 3内存供电的基础上PM6670S控制器评估板


型号：	STEVAL-ISA051V1
厂家：	ST
描述：	Complete DDR2/3 memory power supply controller evaluation board based on the PM6670S 完整的DDR2 / 3内存供电的基础上PM6670S控制器评估板双倍数据速率控制器
文件：	总4页 (文件大小：152K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

STEVAL-ISA051V1

Complete DDR2/3 memory power supply controller

evaluation board based on the PM6670S

Data Brief

Features

■ 4.5 V to 28 V input voltage range

■ 0.9 V, 1ꢀ voltage reference

■ 1.8 V (DDR2) or 1.5 V (DDR3) fixed output

voltages

■ 0.9 V to 2.6 V adjustable output voltage

■ 1.237 V 1ꢀ reference voltage available

■ Very fast load transient response

■ Constant on-time loop control

■ No R

current sensing using the R

DS(on)

SENSE

of the low-side MOSFETs

STEVAL-ISA051V1

■ Negative current limit

■ Latched OVP, UVP and thermal shutdown

■ Fixed 3 ms soft-start

The device is fully compliant with system sleep

states S3 and S4/S5, providing LDO output high

impedance in suspend-to-RAM and tracking

discharge of all outputs in suspend-to-disk.

■ Selectable pulse-skipping at light load

■ Selectable no-audible (33 kHz) pulse-skip

mode

■ All ceramic output capacitors application

supported

■ Output voltage ripple compensation

Description

This evaluation board is based on the PM6670S

and represents a complete DDR2/3 power supply

regulator for portable applications designed to

meet JEDEC specifications. It integrates a

constant on-time (COT) buck controller, a 2 Apk

sink/source low drop-out regulator and a 15 mA

low noise buffered reference. The COT

architecture assures fast transient response

supporting both polymeric and ceramic output

capacitors. An embedded integrator control loop

compensates the DC voltage error due to the

output ripple. The 2 Apk sink/source linear

regulator provides the memory termination

voltage with fast load transient response.

February 2008

Rev 1

1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

Circuit schematic

STEVAL-ISA051V1

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

D N G _ T T V

T T V

N I _ O D L

F E R T T V

G C S D

8 S 1 _ 1 G P

5 0 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

2 _ 5 0 S 1 _ _ 1 N I

1 _ 5 0 S 1 _ _ 1 N I

2 _ 5 0 _ S 1 _ W S V

1 _ 5 0 _ S 1 _ W S V

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

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

5 0 S 1 _ 1 B F V

5 0 S 1 _ P M O C

5 0 S 1 _ S S

8 S 1 _ S S

B F _ T T V

C C V

C C V A V

2/4

STEVAL-ISA051V1

Revision history

Table 1.

Date

11-Feb-2008

Document revision history

Revision

Changes

Initial release.

3/4

STEVAL-ISA051V1

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STEVAL-ISA051V1 [STMICROELECTRONICS]

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