FUJITSU MB3829 User Manual

查询MB3829供应商

March 1998 Edition 1.0

DATA SHEET

MB3829

System Power Supply IC for Mobile Telephone

DESCRIPTION

This power supply IC incorporates a 4-channel series regulator and a battery backup function. It is a multi- function power supply IC with an output control function and momentary power- loss detection circuit, which are both required for mobile telephones. It also incorporates a speaker amplifier and a buzzer driver. Since it has a built -in power system suitable for mobile telephones, it promises equipment downsizing.

FEATURES

Power consumption during standby : 0.22 mW (typ.)

4- channel low -saturation voltage type : 6 W typ. for channels 1 -3 series regulator 20 W typ. for channel 4

Battery backup function

Momentary power - loss and power -restoration functions

ON/OFF switch circuit with an operating error prevention function

BTL amplifier for driving the speaker : Output power= 90 mW typ.

Buzzer driver to permit changing the sound volume : 200 mA max.

Power supply voltage drops are accurately detected.

Hysteresis is provided for detection voltage.

Watchdog timer stop function is provided (inhibit pin).

Watchdog monitoring time and reset time are set independently.

48-PIN PLASTIC LQFP

(FPT-48P-M05)

Copyrightã1998 by FUJITSU LIMITED

This device contains circuitry to protect the inputs against damage due to high static voltages or electric fields. However, it is advised that normal precautions be taken to avoid application of any voltage higher than maximum rated voltages to this high impedance circuit.

1

MB3829

PIN ASSIGNMENT

Voltage monitoring section

Power Controller section

OUT1 : 1

NC : 2

OUT4 : 3

SS : 4

VCC1 : 5

OUT2 : 6

CTL2 : 7

OUT3 : 8

CTL3 : 9

BATT1 : 10

GND2 :11

48 : VCC2

47 : OFF

46 : ON2

45: ON1

44: CT1

(TOP VIEW)

43: CTP

42: CTW

41: RESET

40: CK

39: INH

38: CHOICE

37: SB

Speaker Amp section

36 : IN

35 : BP

34 : FB

33 : GND4

32 : GND3

31 : OUTB

30 : OUTA

29 : VCC4

28 : CLK

27 : IN1

26 : IN2

GND1 :12

CLR : 13

CT2 : 14

CT3 :15

TOUT : 16

(FPT - 48P -M05)

VREF : 17

VCC3 : 18

VCC5 : 19

VO3 : 20

VO2 : 21

VO1 : 22

GND5 : 23

25 : IN3

Sunder section

GND6 : 24

2

PIN DESCRIPTION

MB3829

Power supply control section

10

11

I/O

1

2

3

4

5

6

7

8

9

OUT1

NC

OUT4

SS

VCC1

OUT2

CTL2

OUT3

CTL3

BATT1

GND2

O

-

O

-

O

I

O

I

-

REG1 output pin (3.0 V)

Unconnected pin (open)

REG4 output pin (3.0 V)

VREF slow- start capacitance connection pin

Power supply pin for power supply control section

REG2 output pin (3.0 V)

REG2 control pin In REG1 operating H level: REG2 operation; L level: REG2 OFF

REG3 output pin (3.0 V)

REG3 control pin In REG1 operating H level: REG3 operation; L level: REG3 OFF

Backup battery connection pin

Ground pin

DescriptionPin No. Pin Symbol

Sounder section

12

13

14

15

16

17

18

19

20

21

22

23

24

25

GND1

CLR

CT2

CT3

TOUT

VREF

VCC3

VCC5

VO3

VO2

VO1

GND5

GND6

IN3

-

I

-

O

-

O

-

I

Ground pin

Reset pin for momentary power - loss detection and power restoration section

Pin for connecting momentary power - loss evaluation time setup capacitor

Pin for connecting momentary power - loss evaluation time setup capacitor and resistor

Pin for momentary power - loss detection and output (open drain)

Pin for reference voltage output

Power supply pin for momentary power - loss detection and power - restoration section

Power supply pin for sounder section

Output 3 pin (open collector)

Output 2 pin (open collector)

Output 1 pin (open collector)

Ground pin

Control input 3 pin (H level: VO3 operation)

(Continue)

3

MB3829

(Continued)

Sounder section

Speaker amplifier section

26

27

28

29

30

31

32

33

34

35

36

37

38

IN2

IN1

CLK

VCC4

OUTA

OUTB

GND3

GND4

FB

BP

IN

SB

CHOICE

I/O

O

DescriptionPin No. Pin Symbol

I

-

I

-

I

-

Control input 2 pin (H level: Vo2 operation)

Control input 1 pin (H level: Vo1 operation)

Clock input pin

Power supply pin for speaker amplifier section

Output A pin

Output B pin

Ground pin

Inverted input pin

Bypass pin

Non-inverted input pin

Control input pin (H level: speaker amplifier operation)

Earphone selection control pin

Voltage monitoring section

Power supply control section

39

40

41

42

43

44

45

46

47

48

INH

CK

RESET

CTW

CTP

CT1

ON1

ON2

OFF

VCC2

I

O

-

I

-

Inhibit pin

Clock input pin

Reset output pin

Pin for watchdog timer monitoring time setup

Pin for power- on reset hold time setup

Pin for connecting ON time setup capacitor

ON1 pin

ON2 pin

OFF pin

Power supply pin for ON/OFF switch section

4

BLOCK DIAGRAM

VCC1

OUT4

3

(3.0V)

5

MB3829

BATTI

(3.18V)

10

1K

VCC3

TOUT

CLR

CT3

1816131514

CT2

VO1

22

VO2

21

VO3

20

OUT3

(3.0V)

CTL3

OUT2

(3.0V)

CTL2

OUT1

(3.0V)

- +

REG1 REG2 REG3 REG4

- +

S

loss detection and

-

Backup section

restoration section

-

power

momentary power

Sound driv-

er

Watchdog

timer

27A

-

MB3793

38 43 41 39 42 40 27 26 25 28 19 23 24

Q

R

Control

Speaker amp.

31

GND1 GND2

+ -

12 11 1 7 6 9 8

Refernce Voltage

Bias generator

- + 32 33

34 30

ON/OFF switch

29

48

VCC2

44

CT1

45

ON1

46

ON2

47417

SS

OFF

VREF

(1.26V)

37

SB

35

BP

36

IN

VCC4 FB GND3 GND4 OUTAOUTB CHOICE CTP RESET INH CTW CK IN1 IN2 IN3 CLK VCC5 GND5 GND6

5

MB3829

Function Descriptions

1. Power supply control section

(1) Reference voltage circuit

The reference voltage circuit generates a temperature- compensated, stable voltage (» 1.26 V). The generated reference voltage is used as the power supply control section reference voltage or bias.

(2) Series regulator section

A 4- channel series regulator incorporating a low- saturation output transistor is used. All four channels provide an output voltage of 3.0 V. Their characteristics are described below.

REG1 is suitable for a microcontroller power supply because it is connected to a power-on reset circuit. It is controlled by the ON/OFF switch section.

ON/OFF control of REG2 and REG3 is exercised independently by the CTL2 and CTL3 pins while REG1 is ON.

REG4 operates at all times and is therefore suitable for data backup.

REGs 1 through 4 incorporate an overcurrent- protection circuit (REG1 to REG3 » -100 mA, REG4 » -25 mA).

(3) Battery backup section

When the main battery is installed, the series regulator recharges a button-type lithium secondary battery, which is often used to provide backup for clocks and memory. When the main battery is not installed, the backup battery supplies power to clocks and the battery via a built- in diode. Since the recharging series regulator is set at 3.18 V, this battery backup section is suitable for manganese and lithium batteries.

(4) ON/OFF switch section

When a time-setup capacitance and resistance are connected to the CT1 pin, the ON1 pin makes it possible to set the power supply button activation time. This feature prevents turning ON a mobile telephone accidentally.

The ON2 and OFF pins provide a method of exercising direct ON/OFF control of the regulator.

ON time setting calculation formula: T

(5) Momentary power - loss function and power -restoration section

When a time-setup capacitanceand resistance are connected to the CT3 pin, a momentary Vcc loss, which may be caused by battery replacement, etc., will be detected so as to deliver output to the TOUT pin. At power restoration, the operating state before the momentary power loss is recovered.

After a momentary power loss, the CLR pin resets the prevailing state so that the momentary power-loss detection circuit retains the latch circuit state.

Momentary power - loss detection time calculation formula: T

ON

» -C

x RT1x ln (1-1.26V/V

T1

OFF

» -C

)

CC2

x RT3x ln (1-(2.3V - 0.27V)/2.3V)

T3

6

(6) ON/OFF setup conditions for individual channels

ON/OFF switching

section

ON2 OFF

CTL2

CTL3 REG1 REG2

REG3ONREG4

MB3829

Battery

backup

L

H

L

´

L

H

L

H

´

L

H

OFF (standby mode)

OFF

ON

OFF

ON

OFF

ON

2. Speaker amplifier section

A BTL- output type amplifier is used to drive the speaker directly. The typical output power is as high as 90 mW (at 32 W), and the SB pin provides ON/OFF control.

The CHOICE pin controls earphone selection.

3. Sounder section

This section incorporates three low- saturation output transistors for driving the buzzer. IN1, IN2, and IN3 are used to select the output transistor.

4. Voltage monitoring section

This section incorporates the REG1 output voltage detection functionand watchdog timer function. It outputs a reset signal to the RESET pin. Further, the detection time varies with the capacitance connected to the CTP and CTW pins.

7

MB3829

ABSOLUTE MAXIMUM RATINGS

Parameter Symbol

Power-supply voltage

Common to all

sections

Power supply control

section

Speaker amplifier

section

Sounder section

Voltage monitoring

section

*: Value as mounted on double-sided epoxy board 10 ´ 10 cm

NOTE: Permanent device damage may occur if the above Absolute Maximum Ratings are exceeded. Functional operation should be

restricted to the conditions as detailed inthe operationalsections ofthis datasheet. Exposure to absolute maximumrating conditions for extended periods may affect device reliability.

Power dissipation

Storage temperature

Output current

Reset output current

V

CC

P

Tstg

IO1to I

I

O4

I

O

I

O1

I

O2

I

O3

IOL, I

D

O3

OH

Condition

—

TA£ +25°C

—

Duty = 50%

DC

Value

10

860*

-50 to +125

-60

-12

150

240

120

60

-10 to 10

Unit

V

mW

°C

mA

RECOMMENDED OPERATING CONDITIONS(1)

Common to all sections

Parameter Symbol

Power supply voltage

Power supply voltage buildup time

Operation temperrature

V

TV

CC

T

A

Condition

—

Min.

3.49

50

-30

Value

Typ.

—

25

Max.

8.0

—

85

Unit

V

mS/V

°C

8