Rainbow Electronics BD9731KV User Manual

5-channel switching regulator controller

BD9731KV

01W038A

Description

Dimension (Units : mm)

BD9731KV is a PWM switching regulator controller IC.
The 5-channel (4 channel for step-up, and 1 channel for
step-down) switching regulator controllers are integrated
into a VQFP48 package. This IC can operate both Bipolar
and MOS transistor. Triangle wave oscillator, reference
voltage, PWM comparator, CMOS type driver, and short
protection circuit are integrated.

Features

1) Can operate both external transistors of Bipolar and MOS.
(Base current can be set by resistance.)

2) Built-in output shutdown circuit (Timer latch) when overloaded.

3) Channel 1, and 5 can externally set the reference voltage.

4) Channel 1, 4, and 5 can control independently ON/OFF.

5) All channels have dead time control.

Applications

Digital still camera, Portable DVD player, W-CDMA, PDA, Digital movie camera

37

0.2

±

7.0

9.0±0.3

48

0. 1

±

0.5

1.425

0. 10

VQFP48

9.0±0.3

7.0±0.2

1

2536

12

0.2±0. 1

24

13

0.4

0. 15±0.1

0. 10

Absolute Maximum Ratings (Ta=25˚C)

–20

–55

Limits

~

400

900

~
~

+12–0.3

∗1

∗2

+85

+125

Parameter Symbol

Maximum applied voltage

Power dissipation

Operating temperature range

Storage temperature range

∗Derating : 4.0mW/˚C for operation above Ta=25˚C (Only IC unit)

∗PCB (70mmx70mm, t=1.6mm) glass epoxy mounting. Derating : 9.0mW/˚C for operation above Ta=25˚C

Vmax

Pd

Topr

Tstg

Recommended Operating Conditions (Ta=25˚C)

Parameter Min. Max. UnitTyp.Symbol

Power supply voltage
Oscillating frequency

Output current

VCC

fosc

IOUT

100 700 kHz

—2.8 11

—

—— 30

Unit

V

mW

˚C
˚C

V

mA

May, 2001

Electrical characteristics (Unless otherwise noted; Ta=25˚C, Vcc=6V, fosc=0.20MHz, STB1~5=3V)

Symbol Min. Max. Unit ConditionsTyp.Parameter

Circuit current at stand-by

Circuit current at operating
<Reference voltage>

Output voltage

<Internal regulator>

Output voltage REGA
<Shutdown at overloaded>
CH1~5 threshold voltage

<Protection circuit>
SCP pin detection circuit
Triangle wave oscillator
Oscillating frequency

<Output>

Output voltage 'H' at operating

Output voltage 'L' at operating

Maximum output source current

Maximum output sink current

<STB1~5>

STB pin
control voltage

Operating

Non-operating

Block Diagram

Ist —

Icc

Vref

VREGA

Vsc1~5

Vtsc

fosc1 0.179

VSATH

Vcc–0.3

VSATL

IOSOURCE

Iosink

VSTBL

VSTBH

34

VREF

43

DTC1

40

FB1

41

INV1

42

NON1

39

SCP1

38

DTC2

36

FB2

35

INV2

37

SCP2

26

DTC3

24

FB3

23

INV3

25

SCP3

19

DTC4

21

FB4

22

INV4

20

SCP4

—

1.485

2.4

1.425

0.90

—

—

—

2.0

–0.3

30.GND

ERRAMP1

ERRAMP2

ERRAMP3

ERRAMP4

Vcc–0.1

32.VCC

VOLTAGE

REFERENCE

SCPcomp1

SCPcomp2

SCPcomp3

SCPcomp4

—

4.5

1.5

2.5

1.5

1.0

0.20

0.1

—

—

—

—

To Control

REG A

Block

1.515

1.575

1.10

0.221

–30

VREGA

PWM

PWM

PWM

PWM

10

9.5

2.6

—

0.3

30

—

0.3

2933

SCP

U.V.L.O

TIMER LATCH

S

Q

Pch DRIVER

Pch DRIVER

Pch DRIVER

Pch DRIVER

µA

mA

V

V

V

V

MHz

V

V

mA

mA

V

V

R

STB1~5=0V

Iref=–1mA

Ireg=–1mA

VSCP1~5=2V~1V

VSCP=0V~1.5V

RT=24kΩ, CT=220pF

Io=10mA

Io=–10mA

REG D

To-Divers

31

44

10

3

2

1

4

5

8

7

6

9

VREGD

PVCC1

OUT1

RBIAS1

OUT2

RBIAS2

PGND1

PVCC2

OUT3

RBIAS3

OUT4

RBIAS4

DTC5

INV5

NON5

SCP5

14

16

FB5

17

18

15

ERRAMP5

SCPcomp5

28 48 47 46 45

27

RT

CT

PWM

Nch DRIVER

BD9731KV

STB1

STB5

STB4

STB23

13

12

11

RBIAS5

OUT5

PGND2