AT1397A/B

Preliminary Product Information

6-Channel DC-DC Converter for DSC

7F, No.9, Park Avenue II, Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C.

Tel: 886-3-563-0878

Fax: 886-3-563-0879

1/10/2006

REV:1.0

2

Block Diagram

Ramp1

0.8V

FB1

CTL3

-

+

-

+

COMP1

SS1

CTL1

PVCC1

LX1

PGND1

Ramp2

0.8V

FB2

Step-

Down

Pre-

Driver

Current

Sense

-

+

-

+

COMP2

SS2

PVCC2

LX2

PGND2

Power

Good

/SDOK

OSC1

0.8V

FB3

Step-

Down

Pre-

Driver

-

+

+

-

COMP3

SS3

PVCC3

OUT3S

OUT3M

PGND3

OSC2

IN4

Step-

Up/

Down

Pre-

Driver

-

+

+

-

SS4

PVCC4

OUT4

SEL4

COMP4

IP4

CTL4

*Selectable P-ch or N-ch

driver for step-down/up/

inverting converter

OSC1

FB5

Step-

Up

Pre-

Driver

-

+

+

-

SS5

OUT5

CTL5

COMP5

VREF

FB5H

+

-

1V

OVP

OSC2

FB6

Step-

Up

Pre-

Driver

-

+

+

-

SS6

OUT6

0.8V

COMP6

CTL6

Short-Circuit

Protection

CSCP

SCP3

SCP4

SCP5

SCP6

OVP

VRGEN

VBGEN

LDO

2.3V

OSC

CTLU

Ramp

Gen

CT

VBG

2V

1.22V

VREG

VCC

GND

CTL2

*Metal Option

LED Driver (VREF=0.2V)

or Step-Up(VREF=0.8V)

Ramp2

Ramp1

OSC2

OSC1

-

-

+

+

+

+

Step-

Down

Pre-

Driver

Current

Sense

SS1OK

SS1OK

SS1OK

SS1OK

SS1OK

SS1OK

UVLO

0.8V