Datasheet ISA053V2 Datasheet (ST)

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Page 1

Demonstration board for the PM6680A dual synchronous

step-down controller with adjustable output voltages plus LDO

Features

■ Constant on-time control allows very fast load

transients

■ 6 V to 36 V input voltage range

■ 5 V auxiliary output voltage

■ Adjustable switching outputs

■ Lossless current sensing

■ Negative current limit

■ Soft-start internally fixed at 2.8 ms

■ Soft-end for output discharge

■ 200 kHz / 300 kHz, 300 kHz / 400 kHz, 400 kHz

/ 500 kHz (OUT1 / OUT2 selectable switching frequency)

■ Selectable pulse skip and no-audible skip

modes at light loads

■ Independent power good signals

STEVAL-ISA053V2

Data Brief

STEVAL-ISA053V2

Description

The PM6680A is a dual step-down controller with adjustable output voltages. This demonstration board is designed to test the performance of the PM6680A by employing a typical application circuit which allows testing of all the PM6680A device functions. The kit features two switching sections, with (typically) 3.3 V and 1.8 V outputs, from a 6 V to 36 V input voltage.

The typical operating switching frequency of the two switching sections is 200 kHz / 300 kHz, respectively. Each switching section delivers more than 2.5 A of output current.

Moreover, an internal linear regulator can provide 5 V @ 100 mA peak current.

June 2008 Rev 1 1/4

For further information contact your local STMicroelectronics sales office.

www.st.com

Page 2

Circuit schematic STEVAL-ISA053V2

LDO_FB

BOOT2

BOOT1

BOOT2

BOOT1

FB1

LDO_FB

PGND

VIN

V5SW

OUT5V

SGND

V+

VIN

SGND

V+

SGND

PGND

SGND

V+

SGND

PGND

VIN

OUT5V

V5SW

PGND

SGND

PGND

SGND

V+

SGND

LIKE 4-PIN JUMPER

A - S12 CLOSED

B - S14 CLOSED

C - S12.1 TO S14.2

MOSFET-N-SO8

100n

C17

LDO5V+

C27

1uF

C27

1uF

J10

PGND

J10

PGND

500R

3V3L1L1

3V3

15u

R251K1K

SMA

100K

OUT2-

C19

100n

C19

100n

C12

330uF

C12

330uF

C13

C24

100n

C24

100n

MOSFET-N-SO8

C20

1uF

C20

1uF

PGOOD1

R31

100n

CIN

C22

220nF

C22

220nF

R27

15u

R29

C15

150pF

C15

150pF

R32

R10

10R

R10

10R

15uC1C1

15u

PGOOD2J7J7

PGOOD2

R33

CREF

100n

CREF

100n

JP2SO

S10

JP4I

S10

JP4I

C26

4u7

C26

4u7

R24

R16

100K

R16

100K

100n

47R

OUT1+

JP3SO

R17

560K

R17

560K

C25

100n

C25

100n

15uC2C2

15u

C16

100pF

C16

100pF

R14

100K

R14

100K

C10

100n

C10

100n

C21

4u7

C21

4u7

RLD5V

100K

RLD5V

100K

SMA

R28

R30

C14

BAT54A/SOT

500R

C11

330uF

C11

330uF

-VINJ2J2

-VIN

R11

10R

R11

10R

MOSFET-N-SO8

R20

JP2SO

OUT1-

JP4I

R22

JP2SO

R26

3R9

R26

3R9

R18

560K

R18

560K

JP3SO

C18

MOSFET-N-SO8

J11

EXT5V

J11

EXT5V

+VINJ5J5

+VIN

JP2SO

LDO_ADJ

C28

4u7

C28

4u7

JP3SOS8S8

JP3SO

R23

R19

560K

R19

560K

PM6681_VFQFPN32

BOOT1

HGATE1

PHASE1

CSENSE1

V5SW

OUT1

COMP1

LDO_FB

LGATE1

PGOOD1

PGOOD2

SHDN

SKI

FSE

LDO

BOOT2

HGATE2

PHASE2

CSENSE2

PGND

SGND

OUT2

COMP2

FB2

FB1

LDO

LGATE2

C23

10pF

C23

10pF

R15

100K

R15

100K

SWDIP-4

OUT2+

100K

1 Circuit schematic

Figure 1. Schematic diagram

J10

OUT2+

J2J2-VIN

-VIN

J5J5+VIN

+VIN

VIN

2/4

LDO5V+

R26

V+

PGND

CIN

PGND

C2C215u

15u

PGND

C1C115u

15u

PGND

3R9

4u7

C26

SGND

100n

C19

SGND

RLD5V

100K

SGND

4u7

C21

SGND

C20

1uF

C20

1uF

SGND

47R

C22

BOOT2

BOOT1

BAT54A/SOT

V+

15u

VIN

JP2SO

1 2

C13

8 7 6 51

BOOT2

10R

VIN

10R

51 6 7 8

C14

LDO

VCC

100n

OUT5V

MOSFET-N-SO8

100n

BOOT2

BOOT1

R22

MOSFET-N-SO8

JP2SO

L1L13V3

3 2

R20

HGATE2

HGATE1

2 3

1 2

3V3

8 7 6 51

51 6 7 8

R11

V+

220nF

SGND

R10

BOOT1

PGND

S8S8JP3SO

JP3SO

560K

R18

MOSFET-N-SO8

1 0R

1 0R R2

PHASE2

PHASE1

R23

MOSFET-N-SO8

OUT1+

C24

100n

C24

100n

SMA

3 2

R7 500R

LGATE2

LGATE1

2 3

R19

560K

SMA

C12

330uF

C11

330uF

C25

JP3SO

CSENSE2

CSENSE1

100n

PGND

V5SW

500R

100n

C10

J10

PGND

OUT2-

R25

PGND

C15

SGND

OUT2

SGND

COMP1

OUT1

OUT5V

PGND

R30

R29

SGND

LDO_ADJ

SGND

A - S12 CLOSED

LIKE 4-PIN JUMPER

B - S14 CLOSED

FB1

PGOOD2

3 100K

3 100K R1

V+

C18

100pF

C - S12.1 TO S14.2

3 JP2SO

3 JP2SO S1

LDO

SHDN

PGOOD1

J7J7PGOOD2

VIN

R28

R32

R31

SGND

R33

SGND

4u7

C28

SGND

C27

1uF

SGND

FSE

SKI

VREF

EN1

EN2

PGOOD2

SGND

560K

R17

FB1

R27

SGND

S1S1JP3SO

LDO_FB

PM6681_VFQFPN32

R15

100K

V+V+V+

SGND

V+

JP4I

S10

SGND

100n

CREF

R14

100K

R16

100K

C23

10pF

C23

10pF

SWDIP-4

SGND

J11

EXT5V

V5SW

OUT5V

150pF

C17

2 JP2SO

2 JP2SO S1

FB2

COMP2

LDO_FB

PGOOD1

LDO_FB

2 100K

2 100K R1

V+

C16

R24

PGND

OUT1-

Page 3

STEVAL-ISA053V2 Revision history

2 Revision history

Table 1. Document revision history

Date Revision Changes

06-June-2008 1 Initial release.

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STEVAL-ISA053V2

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