1/4

REV. C

STURUCTURE

Silicon Monolithic Integrated Circuit

Type

4 Channel Switching Regulator control system for DSC

PRODUCUT SERIES

BD9855MWV

THYSICAL DIMENSIONS Package(Plastic Mold) Fig.1、Block Diagram Fig.2、Pin Description Fig.3

FEATURES

●Include step-down 2ch,Cross converter 1ch,step down/inverting 1ch.

●Short Circuit Protection (SCP), Under Voltage Lockout Function (UVLO),

Include external synchronous rectification operation

●Independent ON/OFF Function Each Channel、UQFN044V6060 Package（0.4mm pitch）

○Absolute Maximum Ratings（Ta=25℃）

(*1) Without external heat sink, the power dissipation degrades by 4.2mW/℃

above 25℃.

(*2)Power dissipation degrades by 8.0mW/℃ above 25℃, when mounted on a PCB (70mm×70mm×1.6mm).

○Operating Conditions

Parameter

Symbol

Spec.

Unit

Condition

MIN

TYP

MAX

【Input Voltage】

Power Supply Voltage

VCC,PVCC

4

6

14

V

【Reference Output】

VREG,VREGA terminal capacitor

CVR*

0.47

1.0

2.2

μF

VREF terminal capacitor

CVREF

0.047

0.1

2.2

μF

【Protect Circuit】

SCP terminal capacitor

CSCP

0.001

－

2.2

μF

【Oscillator】

Oscillator frequency

Fosc

0.6

1.0

1.5

MHz

OSC timming resistor

RT

47

82

120

kΩ

RTSS terminal capacitor

CRTSS

1000

10000

－

pF

SYNC terminal input H

VSYNCH

3.0

-

VCC

V

SYNC terminal input L

VSYNCL

-0.3

-

0.5

V

SYNC terminal input Duty

Dsync

40

50

60

%

【Driver】

BST-Lx voltage

Vbst

3.5

－

5.5

V

BST-Lx capacitor

Cbst

0.047

0.1

0.22

μF

LX31terminal input voltage

VLX31

－

－

14

V

CH3 output range

VVOUT3

4.0

－

7.0

V

PVCC1,2,4 terminal input voltage

PVCC1,2,4

－

－

14

V

CH1,2,3output current

Ioutch1,2,3

－

－

1

A

※)Please connect capacitor at input/output terminal (VCC,PVCC,VREF,VREG etc.) to operate IC stabilize.

Status of this document

The Japanese language version of this document shall be the official specification.

Any translation of this document shall be for reference only.

Parameter

Symbol

Limits

Units

Po wer Sup pl y V ol t ag e

VCC,PVCC

－0.3～15

V

In pu t

V o lt ag e

BST1-LX1、BST2-LX2

－0.3～7

V

LX31

－0.3～15

V

Vo3,LX32

－0.3～8.4

V

PG,SYNC, CTL1,2,3,4

－0.3～15

V

SEL

－0.3～7

V

Pow e r

Dissip a t i on

Pd

540(*1),1000(*2)

mW

Op er at ing Te m p era t ur e

Topr

－25～+85

℃

S tora ge Te mpe r at ure

Tstg

－55～+150

℃

Junction Te mperature

Tjmax

150

℃