MB3788PFV_技术文档

FUJITSU SEMICONDUCTOR

DATA SHEET

DS04-27209-1E

ASSP

SWITCHING REGULATOR

CONTROLLER

MB3788

24-PIN PLASTIC SSOP

■ DESCRIPTION

The MB3788 is a dual-channel PWM-type switching regulator controller; it in-

corporates a reference voltage.

The MB3788 has a PWM circuit and an output circuit as well as a reference

voltage power supply with a voltage accuracy of ±1%. The maximum operating

frequency is 1 MHz. It is designed for a voltage-drop output switching regulator

suitable for a logic power supply or speed control of a DC motor.

The MB3788 is compatible with all master ICs producing triangular waves, saw-

tooth waves and sine waves with an amplitude of 1.3 to 1.9 V.

It can be used in high-performance portable equipment such as a video cam-

corder or notebook personal computer (word processor).

■ FEATURES

- Wide operating power supply voltage range: 3.6 to 18 V

- Low power dissipation

- Operating: 1.9 mA (standard)

Standby: 10 µA max.

- High-frequency operation: 100 kHz to 1 MHz

- On-chip timer and latch-type short-circuit detection circuit

- Wide error amplifier input voltage range: -0.2 V to VCC - 1.8 V

- On-chip high-accuracy reference voltage circuit: 2.50 V ±1%

- Output circuit

(FPT-24P-M03)

PNP transistor drive output pin: Push-pull type

ON/OFF current values set independently

- On-chip standby function and output control function

- High-density packaging: SSOP-24P

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 appli-

cation of any voltage higher than maximum rated voltages to

this high impedance circuit.

1

MB3788

■ PIN ASSIGNMENT

(TOP VIEW)

VCC(out)

OUT1

VE1

1

2

24

23

22

21

20

19

18

17

16

15

14

13

GND

OUT2

VE2

3

Cb1

4

Cb2

Ca1

5

Ca2

FB1

6

FB2

-IN1(E)

+IN1(E)

-IN1(C)

-IN(PWN)

VCC

7

-IN2(E)

+IN2(E)

-IN2(C)

SCP

8

9

10

11

12

CTL2

CTL1

VREF

(FPT-24P-M03)

2

MB3788

■ PIN DESCRIPTION

Pin No.

Pin name

I/O

O

I

Descriptions

Channel 1 push-pull type output

Channel 1 output current setting

2

3

OUT1

VE1

4

Ca1

—

O

I

Channel 1 output transistor OFF current setting: Output transistor OFF

The current is set by connecting a capacitor between pins Ca1 and Cb1.

5

Cb1

Channel

1

Channel 1 error amplifier output

6

FB1

Channel 1 error amplifier inversion input

Channel 1 error amplifier non-inversion input

Channel 1 comparator inversion input

Channel 2 comparator inversion input

Channel 2 error amplifier non-inversion input

Channel 2 error amplifier inversion input

Channel 2 error amplifier output

7

-IN1(E)

+IN1(E)

-IN1(C)

-IN2(C)

+IN2(E)

-IN2(E)

FB2

8

9

I

16

17

18

19

20

21

22

23

I

O

—

I

Channel

2

Ca2

Channel 2 output transistor OFF current setting: Output transistor OFF

The current is set by connecting a capacitor between pins Ca2 and Cb2.

Cb2

VE2

Channel 2 output current setting

Channel 2 push-pull type output

OUT2

O

Power and channel 1 control pin

H level: Power and channel 1 operating

L level: Standby

13

14

CTL1

I

Channel 2 control pin

Control

circuit

When CTL1 pin = H level,

H level: Channel 2 operating

L level: Channel 2 OFF

CTL2

SCP

15

1

—

I

Short-circuit protection circuit capacitor connection

Output circuit power pin

2

VCC

10

11

12

24

-IN(PWM)

VCC1

Master oscillating waveform input

Reference power and control circuit power

Reference voltage output

Power

circuit

—

O

—

VREF

GND

Ground

Note: The alphabetic characters in parenthesis above indicate the following input pins.

(C): Comparator

(E): Error amplifier

3

MB3788

■ BLOCK DIAGRAM

Cb1

Channel 1

4

5

Ca1

Error amplifier 1

OFF current setting

+

-

1

2

3

VCC(out)

+IN1 (E)

-IN1 (E)

FB1

8

7

6

PWM comparator 1

+

-

OUT1

VE1

Comparator 1

+

-

0.6 V

1.5 V

9

-IN1 (C)

Ca2

Cb2

Channel 2

20

21

Error amplifier 2

OFF current setting

+

-

+IN2 (E) ¹⁷

PWM comparator 2

+

-

18

-IN2 (E)

OUT2

VE2

23

22

19

FB2

Comparator 2

+

-

0.6 V

1.5 V

16

-IN2 (C)

SCP comparator

CTL2

14

-

+

1.9 V

1.3 V

Timer circuit

1 µA

2.1 V

VCC

11

SCP

VREF

15

Low input

Power/channel

ON/OFF

Reference

voltage

power (2.5 V)

SR latch

circuit

voltage

protection

circuit

13 CTL1

circuit

10

12

24

-IN(PWM)

VREF

GND

4

MB3788

■ FUNCTIONAL DESCRIPTION

1. Major Functions

(1) Reference voltage power circuit

The reference voltage power supply produces a reference voltage (≈ 2.50 V) which is temperature-compensated by the voltage

supplied from the power pin (pin 11); it is used as the IC internal circuit operating power supply.

The reference voltage can also be output externally at 1 mA from VREF pin (pin12).

(2) Error amplifier

The error amplifier detects the switching regulator output voltage and outputs a PWM control signal. It has a wide in-phase input

voltage range of -0.2 V to VCC - 1.8 V to make setting from an external power supply easy.

Connecting the output pin and inversion input pin of the error amplifier through a feedback resistor and capacitor allows setting

of any loop gain to provide stable phase compensation.

(3) PWM comparator

The PWM comparator controls the output pulse ON time according to the input voltage.

The voltage input to the -IN pin (PWM) turns the output transistor on when it is lower than the output voltage of the error amplifier.

(4) Output circuit

The output circuit is configured in a push-pull form and uses a PNP transistor drive system to drive a transistor of up to 30 mA.

(See How to Set Output Current.)

2. Channel Control Function

Channels can be set ON/OFF by combining the voltage levels at pin CTL1 (pin 13) and pin CTL2 (pin 14).

Channel ON/OFF Setting Conditions

Voltage level at CTL pin

Channel ON/OFF status

Power circuit Channel 1 Channel

Stand by state*

CTL1

CTL2

L

×

H

L

H

ON

OFF

*The power current in the standby state is 10 µA max.

5

MB3788

3. Protection Functions

(1) Timer and latch-type short-circuit protection circuit

The SCP comparator detects the output voltage levels of two comparators to detect an output short circuit. If the output voltage

of one comparator increases to 2.1 V, the transistor of the timer circuit is turned off and the short circuit protection capacitor

connected externally to the SCP pin (pin 15) starts charging.

The latch circuit turns off the output transistor and simultaneously clears the duty cycle to 0 when the output voltage level of the

comparator does not return to the normal voltage level until the capacitor voltage rises to the base-emitter junction voltage VBE

(≈ 0.65 V) of the transistor. (See How to Set Time Constant for Timer & Latch-Type Short-Circuit Protection Circuit.)

When the protection circuit operates, recycle the power to reset the circuit.

(2) Low input voltage malfunction fail-safe circuit

A transient at power-on, or an instantaneous supply voltage drop can cause a control IC malfunction, which may damage the

system. The low input voltage malfunction fail-safe circuit detects the internal reference voltage level based on the supply voltage

level, resets the latch circuit, turns off the output transistor, clears the duty cycle to 0 and holds the SCP pin (pin 15) at Low level.

All circuits are recovered when the supply voltage is greater than the threshold voltage of the fail-safe circuit.

6

MB3788

■ ABSOLUTE MAXIMUM RATINGS

(TA = +25°C)

Parameter

Supply voltage

Symbol

Conditions

Ratings

20

Unit

V

—

VCC

VICTL

PD

—

Control input voltage

Allowable loss

20

V

Ta ≤ +25°C

500*

mW

°C

—

Operating ambient temperature

Storage temprature

TOP

Tstg

-30 to +85

-55 to +125

* ^{Value obtained when mounted on 4 cm}^×^{4 cm double-sided epoxy substrate}

■ RECOMMENDED OPERATING CONDITIONS

(TA = +25°C)

Values

Parameter

Supply voltage

Symbol Conditions

Unit

Min.

3.6

Typical

6.0

—

Max.

18

VCC

IOR

VI

—

V

Reference voltage output curren

Error amplifier input voltage

Control input voltage

-1

0

mA

-0.2

3.0

—

VCC - 1.8

VCC

18

V

VI

—

VICTL

IO

—

V

Output current

—

30

mA

kHz

°C

Operating frequency

fosc

Top

100

-30

300

25

1000

85

Operating ambient temperature

7

MB3788

■ ELECTICAL CHARACTERISTICS

(VCC =6V, TA = +25°C)

Value

Parameter

Symbol

Conditions

I^OR= -1 mA

Unit

Min.

Typical

Max.

Reference voltage

VREF

2.475

2.500

2.525

V

Output voltage temperature

variation

∆VREF/

VREF

TA = -30° to +85°C

-2

±0.2

2

%

Reference

voltage

Input stability

Line

Load

IOS

VCC = 3.6 V to 18 V

—

2

10

mV

mA

V

Load stability

IOR = -0.1 mA to 1 mA

3

Short-circuit output current

VREF = 2 V

-20

—

-8

-3

VtH

—

2.65

2.45

200

1.9

0.65

-100

—

Threshold voltage

Low voltage

malfunction

fail-safe

VtL

—

V

Hysteresis width

VHYS

VR

—

80

—

mV

V

circuit

Reset voltage

—

1.5

0.58

-200

-0.2

0.60

—

Input offset voltage

Input bias current

VIO

—

0.72

—

V

Short-circuit

detection

comparator

IIB

VI = 0 V

nA

V

In-phase input voltage range

Threshold voltage

VICM

VtPC

VSTB

VI

—

VCC-1.8

0.70

100

-0.6

10

—

0.65

50

V

Input standby voltage

Input latch voltage

Input source current

Input offset voltage

Input offset current

Input bias current

—

mV

µA

mV

nA

V

Short-circuit

detector

—

50

IIbpc

VIO

-1.4

-10

-100

-200

-0.2

60

-1.0

—

VFB = 1.6 V

—

IIO

—

100

—

IIB

-60

—

In-phase input voltage range

Voltage gain

VICM

AV

VCC-1.8

—

100

800

80

dB

kHz

dB

V

Error

amplifier

Frequency bandwidth

In-phase signal rejection ratio

BW

CMRR

VOM+

VOM-

IOM+

IOM-

AV = 0 dB

—

60

—

VREF-0.3

—

2.4

0.05

120

-2

—

Maximum output voltage width

—

0.5

—

V

Output sink current

VFB = 1.6 V

—

µA

mA

Output source current

—

8

MB3788

Values

Min. Typical Max.

Unit

Parameter

Symbol

Conditions

Vt0

Duty cycle = 0 %

1.05

—

1.3

1.9

120

-2

—

2.25

—

V

Threshold voltage

Vt100

IIM+

IIM-

IIB

Duty cycle = 100 %

V

PWM

comparator

Input sink current

Input source current

Input bias current

Threshold voltage

—

µA

mA

µA

V

—

VI = 0 V

—

-1.0

0.7

—

-0.5

1.4

100

—

Vth

IIH

2.1

200

10

VCTL = 5 V

VCTL = 0 V

—

µA

mA

µA

mA

Control

Input current

IIL

-10

—

Source current

IO

-40

30

—

Output

Sink curren

IO

RB = 50 Ω

VO = 18 V

—

18

—

42

Output leak current

Standby current

ILO

ICCO

ICC

—

20

—

0

10

All devices

Power current at output OFF

—

1.9

2.7

9

MB3788

■ STANDARD CHARACTERISTIC CURVES

1. Power current - supply voltage characteristic

2. Reference voltage - supply voltage characteristic

TA = +25°C

2.5

2.0

1.5

CTL1 = 6 V

5

4

3

2

1

0

CTL1, 2 = 6 V

Reference

voltage

VREF (V)

Power

current

lCC (mA)

1.0

0.5

0

4

8

12 16 20

0

4

8

12 16 20

Supply voltage VCC (V)

3.Reference voltage, output current setting pin voltage

- supply voltage characteristic

4. Reference voltage - ambient temperature characteristic

2.56

TA = +25°C

VCC = 6 V

VCTL1, 2 = 6 V

IOR = -1 mA

5

4

3

2

1

0

5

4

Reference

voltage

VREF (V)

2.54

2.52

2.50

2.48

2.46

2.44

VREF

Reference

voltage

VREF (V)

3

2

1

0

Output

current

setting

pin voltage

VE (V)

VE

-60 -40 -20

0

20 40 60 80 100

Ambient temperature TA (°C)

0

1

2

3

4

5

Supply voltage VCC (V)

5. Reference voltage - control voltage characteristic

VCC = 6 V

6. Control current - control voltage characteristic

VCC = 6 V

TA = +25°C

500

400

300

200

100

0

TA = +25°C

3.0

2.8

Reference

Control

current

voltage

VREF (V)

2.6

2.4

2.2

2.0

lCTL1 (µA)

0

1

2

3

4

5

0

4

8

12 16

20

Control voltage VCTL1 (V)

10

MB3788

8.Gain - frequency characteristic and phase - frequency

characteristic

7. Duty - input oscillating frequency characteristic

100

80

Input waveform

VCC = 6 V

VFB = 1.6 V

TA = +25°C

180

90

40

20

1.9V

1.3V

60

Duty

Dtr (%)

Gain

(dB)

Phase

φ (deg)

0

40

20

0

-90

-20

-40

-180

05 K10 K50 K100 K500 K1 M

Input oscillating frequency (Hz)

1 K 10 K100 K1 M5 M10 M

f (Hz)

9. Power dissipation - ambient temperature characteristic

1000

Circuit for measuring gain - frequency characteristic and

phase - frequency characteristic

VCC = 6 V

2.5 V

240 kΩ

800

600

4.7 kΩ 4.7 kΩ

10 µF

Power

dissipation

PD (mW)

-

out

+

-

400

+

in

Error amplifier

200

0

4.7 kΩ

-20 020 406080 100

Ambient temperature TA (°C)

11

MB3788

■ HOW TO SET OUTPUT VOLTAGE

VREF

VOUT

VREF

2 × R2

VOUT =

(R1 + R2)

R

R1

+

-

R

R2

RNF

Note: Set the output voltage in the positive range (VOUT > 0).

12

MB3788

■ HOW TO SET OUTPUT CURRENT

The output circuit is configured in a push-pull type as shown in Figure 1. The ON current value of the output current waveform shown in Figure

2 is a constant current and the OFF value set by RE is set by a time constant. Each output current can be calculated from the following expression:

• ON current = 1.5/RE (A) (Output current setting pin voltage: VE ≈ 1.5 V)

• The OFF current time constant is proportional to the value of C_B.

Drive Tr

ON current

CB

OFF

current

OFF current

setting part

Output

0

current

ON current

OFF current

RE

VE

t

Fig.1 Output Circuit Diagram

Fig.2 Output Current Waveform

1000 pF

VCC

Iout

-IN1 (C)

(5 V)

4

5

22 µH

10 µF

1

8.2 k

2.7 k

Vout

2

MB3788

1000 pF

-IN1 (E)

3

150 Ω

Fig.3 Output Pin Voltage and Current Waveforms (Channel 1)

Fig.4 Measurement Circuit Diagram

13

MB3788

■ HOW TO SET TIME CONSTANT FOR TIMER & LATCH-TYPE SHORT-CIRCUIT

PROTECTION CIRCUIT

If the load conditions of the switching regulator are stable, the outputs of comparators 1 and 2 do not change, so the SP comparator outputs a

High level. At this time, the SCP pin (pin 15) is held at about 50 mV.

If the load conditions change suddenly due to a load short-circuit, for example, the output voltage of the comparator of the channel becomes a

High-level signal (more than 2.1 V). Then, the SVP comparator outputs a Low level and transistor Q1 is turned off. The short-circuit protection

capacitor CPE externally connected to the SCP pin starts to charge.

VPE = 50 mV + tPE × 10^-6/CPE

0.65 = 50 mV + tPE × 10^-6/CPE

CPE = tPE /0.6 (s)

Once the capacitor C_PEis charged to about 0.65 V, the SR latch is set and the output drive transistor is turned off. At this time, the duty cycle

is made low and the output voltage of the SCP pin (pin 15) is held at Low level. This closes the SR latch input to discharge CPE.

2.5 V

1 µA

15

S

R

Low

input

voltage

protection

circuit

PWM

comparator

OUT

-

+

Comparator 1

Comparator 2

SR latch-type

circuit

Q2

CPE

Q1

2.1 V

Fig. 5 Latch-Type Short-Circuit Protection Circuit

14

MB3788

■ PROCESSING WITHOUT USING SCP PIN

If the timer and latch-type short-circuit protection circuit is not used, connect the SCP pin (pin 15) to GND as close as possible. Also, connect

the input pin of each channel comparator to the VCC pin (pin 11).

11

VCC

9

-IN1 (C)

16

-IN2 (C)

GND

SCP

15

24

Fig. 6 Processing without using SCP Pin

15

MB3788

■ EQUIVALENT SERIES RESISTANCE OF SMOOTHING CAPACITOR AND STABILITY OF

DC/DC CONVERTER

The equivalent series resistance (ESR) of the smoothing capacity in a DC/DC converter has a great effect on the loop phase characteristics.

The ESR causes a small delay at the capacitor with a series resistance of 0 (Figures 8 and 9), thus improving system stability. On the other

hand, usingasmoothingcapacitorwithalowESRreducessystemstability. Therefore, attentionshouldbepaidtousingsemiconductorelectrolytic

capacitors (such as OS capacitors) or tantalum capacitors with a low ESP. (Phase margin reduction by using an OS capacitor is explained on

the next page.)

L

Tr

RC

VIN

D

RL

C

Fig. 7 Basic Voltage-Drop Type DC/DC Converter Circuit

20

0

(2)

Phase

(deg)

-90

Gain

(dB)

-20

-40

-60

(2)

(1)

(1): RC = 0 Ω

(2): RC = 31 mΩ

(1)

-180

101001 k 10 k100 k

Frequency f (Hz)

101001 k 10 k100 k

Frequency f (Hz)

Fig.8 Gain - Frequency Characteristic

Fig.9 Phase - Frequency Charecteristic

16

MB3788

(Reference Data)

The phase margin is halved by changing the smoothing capacitor from an aluminum electrolytic capacitor (Rc = 1.0 Ω) to a semiconductor

electrolytic capacitor (OS capacitor: Rc = 0.2 Ω) with a low ESR (Figures 11 and 12).

VOUT

VO+

CNF

A_V- φ characteristic between VOUT and VIN

R2

-IN

+IN

+

-

VIN

FB

R1

VREF/2

Error amplifier

Fig. 10 DC/DC Converter A_V- φ Characteristic Measurement Diagram

Aluminum electrolytic capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)

60

VCC = 10 V

RL = 25 Ω

180

90

CP = 0.1 µF

40

20

AV

ϕ

VO+

Gain

(dB)

+

-

62°

Phase

0

(deg)

GND

-90

-20

-40

Aluminum electrolytic capacitor

220 µF (16 V)

-180

Rc ≈ 1.0 Ω: fOSC = 1 kHz

101001 k 10 k 100 k

Frequency f (Hz)

Fig. 11 Gain - Frequency Characteristic

OS capacitor gain - frequency and phase - frequency characteristics (DC/DC converter +5 V output)

VCC = 10 V

60

40

20

AV

RL = 25 Ω

CP = 0.1 µF

180

90

VO+

ϕ

Gain

(dB)

+

-

Phase

(deg)

0

27°

GND

-20

-40

-90

OS capacitor

22 µF (16 V)

-180

Rc ≈ 1.2 Ω: fOSC = 1 kHz

101001 k 10 k 100 k

Frequency f (Hz)

Fig.12 Phase - Frequency Characteristic Curves

17

MB3788

■ APPLICATION CIRCUIT

10 µH

VCC

+

-

+

-

33 µF

11

13

14

VCC

CTL2

CTL1

4.7 kΩ

8

(a)

Cb1

Ca1

4

5

1

2

3

+IN1 (E)

1000 pF

4.7 kΩ

8.2 kΩ

(a)

Channel 1

(dB)

7

-IN1 (E)

22 µH

5 V

VCC(out)

OUT1

VE1

100 kΩ

0.22 µF

2.7 kΩ

+

-

6

10 µF

FB1

150 Ω

(15 mA)

9

-IN1 (C)

(b)

4.7 kΩ

+IN2 (E)

-IN2 (E)

17

18

20

21

23

22

Ca2

Cb2

1000 pF

3.8 kΩ

2.7 kΩ

22 µH

3 V

(b)

Channel 2

(deg)

+

-

100 kΩ

0.22 µF

OUT2

VE2

10 µF

FB2

19

150Ω

-IN2 (C)

16

VREF SCP

-IN(PWM)

GND

24

10

15

12

0.1 µF

Triangular wave signal

1.9 V

1.3 V

CT

+15 V

+24 V

<MB3785A-used DC/DC converter>

DC motor 1

DC motor 2

18

MB3788

■ PRECAUTIONS

1. Do not apply any voltage greater than the maximum rating, or the LSI may be damaged.

2. Use the MB3788 under the recommended operating conditions.

If a voltage greater than the maximum voltage is applied, the electrical characteristics are not guaranteed; if a voltage smaller than the

minimum voltage is applied, the LSI operation will become unstable.

3. To ground the PC board, use the thickest cable possible because high frequencies are used which can easily produce high-frequency noise.

4. Connecting unused channel pin

For unused channels, the output voltage of the comparator for detecting a short-circuit must be fixed at the Low level.

5. Take measures against static electricity.

• Carry semiconductors in a conductive container or anti-static case.

• Carry the PC board in a conductive bag or container if it is stored or transported after packaging.

• Ground the workbench, and all tools and measuring instruments.

• Workers should be grounded through a resistance of 250 kΩ to 1 MΩ.

19

MB3788

■ PACKAGE DIMENSION

24-pin plastic SSOP

(FPT-24P-M03)

1.25 –⁺0⁰.^.1²0⁰

*

7.75±0.10(.305±.004)

(Mounting height)

.049 ⁺^–.^.⁰⁰⁰⁰⁴⁸

0.10(.004)

*

5.60±0.10

7.60±0.20

6.60(.260)

NOM

(.220±.004) (.299±.008)

INDEX

"A"

0.22 –⁺0⁰.^.0¹5⁰

0.15 –⁺0⁰.^.0⁰2⁵

Details of "A" part

0.10±0.10(.004±.004)

0.65±0.12(.0256±.0047)

.009 ⁺^–.^.⁰⁰⁰⁰²⁴

.006 ⁺^–.^.⁰⁰⁰⁰¹²

(STAND OFF)

7.15(.281)REF

0

10°

0.50±0.20

(.020±.008)

C

1994 FUJITSU LIMITED F24018S-2C-2

Dimensions in mm (inches).

20

MB3788

FUJITSU LIMITED

For further information please contact:

Japan

FUJITSU MEDIA DEVICES LIMITED

Marketing and Technical Support Dept.

SUN HAMADA BLDG 2F

1-19-20, Shin-yokohama

kouhoku-ku Yokohama-shi

Kanagawa 222-0033, Japan

Tel: 81(45) 471-0061

The contents of this document are subject to change without

notice. Customers are advised to consult with FUJITSU sales

representatives before ordering.

Fax: 81(45) 471-0076

The information and circuit diagrams in this document are

presented as examples of semiconductor device applications,

and are not intended to be incorporated in devices for actual use.

Also, FUJITSU is unable to assume responsibility for

infringement of any patent rights or other rights of third parties

arising from the use of this information or circuit diagrams.

North and South America

FUJITSU MICROELECTRONICS, INC.

Semiconductor Division

3545 North First Street

San Jose, CA 95134-1804, USA

Tel: (408) 922-9000

FUJITSU semiconductor devices are intended for use in

standard applications (computers, office automation and other

office equipment, industrial, communications, and

measurement equipment, personal or household devices, etc.).

CAUTION:

Customers considering the use of our products in special

applications where failure or abnormal operation may directly

affect human lives or cause physical injury or property damage,

or where extremely high levels of reliability are demanded (such

as aerospace systems, atomic energy controls, sea floor

repeaters, vehicle operating controls, medical devices for life

support, etc.) are requested to consult with FUJITSU sales

representatives before such use. The company will not be

responsible for damages arising from such use without prior

approval.

Fax: (408) 922-9179

Customer Response Center

Mon. - Fri.: 7 am - 5 pm (PST)

Tel: (800) 866-8608

Fax: (408) 922-9179

http://www.fujitsumicro.com/

Europe

FUJITSU MIKROELEKTRONIK GmbH

Am Siebenstein 6-10

D-63303 Dreieich-Buchschlag

Germany

Tel: (06103) 690-0

Fax: (06103) 690-122

Any semiconductor devices have an inherent chance of

failure. You must protect against injury, damage or loss from

such failures by incorporating safety design measures into your

facility and equipment such as redundancy, fire protection, and

prevention of over-current levels and other abnormal operating

conditions.

http://www.fujitsu-ede.com/

Asia Pacific

FUJITSU MICROELECTRONICS ASIA PTE LTD

#05-08, 151 Lorong Chuan

New Tech Park

Singapore 556741

Tel: (65) 281-0770

If any products described in this document represent goods or

technologies subject to certain restrictions on export under the

Foreign Exchange and Foreign Trade Law of Japan, the prior

authorization by Japanese government will be required for

export of those products from Japan.

Fax: (65) 281-0220

http://www.fmap.com.sg/

F9902

FUJITSU LIMITED Printed in Japan


型号：	MB3788PFV
厂家：	FUJITSU
描述：	Dual Switching Controller, Voltage-mode, 0.03A, 1000kHz Switching Freq-Max, BIPolar, PDSO24, PLASTIC, SSOP-24 稳压器开关控制器
文件：	总21页 (文件大小：738K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

MB3788PFV [FUJITSU]

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