MB3845PFV [FUJITSU]

Power Management 2-ch Switch IC; 电源管理2路开关IC


型号：	MB3845PFV
厂家：	FUJITSU
描述：	Power Management 2-ch Switch IC 电源管理2路开关IC 电源电路开关电源管理电路光电二极管
文件：	总19页 (文件大小：142K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

FUJITSU SEMICONDUCTOR

DATA SHEET

DS04-27604-2E

ASSP For Power Supply Applications

Power Management 2-ch Switch IC

MB3842/MB3845

■ DESCRIPTION

The MB3842/3845 is a power management switch with built-in 2-channel low-on resistance (typ. 100mΩ) switch.

Output control is by means of a control signal, and the MB3842 is designed for high-active operation (output on

when EN is Hi), while the MB3845 is designed for low-active operation (output on when EN is low.)

To provide adaptability to a variety of operations, the MB3842/3845 features low input voltage (V^IN> 2.5V)

operation and stable low-on resistance independent of input voltage. The switching current limit can be set from

100mA to 600mA by using external resistance, and when overcurrent conditions are detected the OC output goes

low to provide an external notification signal.

V^INis divided between the two channels, which operate independently of each other.

In addition, an off-state reverse current prevention function is provided to ensure accurate on/off switching action.

■ FEATURES

• Low on resistance switch (typ. 100mΩ)

• Low input voltage operation (2.5 V to 5.5 V)

• Switch current (max. 0.6 A)

• UVLO

• ENABLE

:V^INthreshold

:EN threshold

2.3V/2.1 V hysteresis 200 mV

EN 1.4V/1.6 V for MB3842, EN 1/2 V^INfor MB3845

:Power supply current at output off = 0µA EN < 0.8V for MB3842, EN = V^INfor MB3845

• External setting for soft start time and switch current limit.

• Over-temperature detection (switch latched off), over-current detection (not latched)

• OC pin flag set following overcurrent detection, over-temperature detection, or UVLO detection.

• Reverse current prevention at OFF (V^IN≥ 1.5 V)

• Either channel may be operated alone.

■ PACKAGE

20-pin plastic SSOP

(FPT-20P-M03)

MB3842/MB3845

■ PIN ASSIGNMENT

EN1, EN1

SS1

GND

OC1

CS1

OUT1

OUT2

OC2

VIN1

SSOP-20P

(FPT-20P-M03)

VIN1

VIN2

CS2

SS2

EN2, EN2

GND

Enable

Slow Start

Current Set OC

Over Current

The functions of pin 1 and pin 10 differ on the MB3842 and MB3845.

EN for MB3842/EN for MB3845

MB3842/MB3845

■ PIN DESCRIPTION

Pin no.

Symbol

Descriptions

Control signal input pin.

Set “H” to turn switch on, “L” to turn toff. At 0.8 V or less, the chip is in STBY state

and current consumption is less than 1µA.

(MB3842)

“L” level is 1.4V (typ), “H” level is 1.6V (typ), with 200mV (typ) hysteresis.

Control signal input pin.

Set “L” to turn switch on, “H” to turn off.

1/10

(MB3845)

At “H” level = V^IN, the chip is in STBY state and current consumption is less than

1µA.

Normally used as CMOS inverter input, so that recommended use is “L” level at

GND +0.5V or less, and “H” level is V^IN-0.5V or greater.

Slow start setting pin. Used to adjust the switch on/off timing.

Add external capacitance to delay operation. Leave open when not in use.

In open mode voltages up to 12 V are present. Care should be taken in mounting

to prevent leakage current generation because high impedance is required.

2/9

3/8

Current limit setting pin.

The limit current level is set by connecting this pin to external resistance.

Switch output pin.

An UVLO (V^INpower monitor function) is provided so that when V^INreaches 2.3V

(typ.) or higher the OC pin voltage goes to “H” level. Also if the V^INvoltage drops to

2.1 V (typ.) or lower the OC output goes to “L” state.

200mV (typ) hysteresis is provided.

4/5/6/7

11/20

VIN

GND

Ground pin.

External notification pin.

When the switch is in on mode this pin normally outputs a “H” level signal, but

changes to “L” level when an overcurrent, overtemperature, or UVLO condition is

detected.

12/19

This is an open drain connection, and should be pulled up to high potential using

resistance.

13/14/15

16/17/18

OUT

Switching output pin.(N-ch MOSFET source)

MB3842/MB3845

■ BLOCK DIAGRAM (for 1 channel)

MB3842

OUT1

CS1

Over current

detection 1

Charge

pump1

COMP

−

SS1

EN1

FF1

COMP

−

OSC1

OC1

VIN1

BGR1

Temperature

protection 1

MB3845

OUT1

CS1

Charge

pump1

Over current

detection 1

COMP

−

SS1

FF1

EN1

COMP

−

OSC1

OC1

VIN1

BGR1

Temperature

protection 1

MB3842/MB3845

■ ABSOLUTE MAXIMUM RATINGS

Rating

Unit

Parameter

Input voltage

Symbol

Condition

Max.

–0.3

—

Min.

V^IN

V^EN

I^SW

—

7.0

ENABLE voltage

Switch current

7.0

1.8

Power dissipation

Storage temperature

P^D

Ta = +85°C

—

216

+125

°C

T^STG

—

–55

WARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current,

temperature, etc.) in excess of absolute maximum ratings. Do not exceed these ratings.

■ RECOMMENDED OPERATING CONDITIONS

Value

Parameter

Symbol

Condition

Unit

Min.

2.5

Typ.

5.0

—

Max.

5.5

0.6

Input voltage

V^IN

V^EN

I^SW

—

ENABLE voltage

Switch current

V^EN≤ V^IN

V^IN= 2.5 V to 5.5 V

—

SS pin capacitance

OC sink current

C^SS*

I^OCS

—

kΩ

V^IN= 5.0 V, V^OC= 0.4 V

V^IN= 5.0 V (I^SW= 0.6 A)

V^IN= 5.0 V (I^SW= 0.1 A)

2.0

1.4

3.6

5.0

2.0

6.2

—

2.6

9.1

Current limit

resistance

R^LIM*

T^OP

Operating

temperature

—

–20

—

+85

°C

* : For C^SS, R^LIMsettings, see “TYPICAL CHARACTERISTICS” and “FUNCTIONAL DESCRIPTION”.

WARNING: The recommended operating conditions are required in order to ensure the normal operation of the

semiconductor device. All of the device's electrical characteristics are warranted when the device is

operated within these ranges.

Always use semiconductor devices within their recommended operating condition ranges. Operation

outside these ranges may adversely affect reliability and could result in device failure.

No warranty is made with respect to uses, operating conditions, or combinations not represented on

the data sheet. Users considering application outside the listed conditions are advised to contact their

FUJITSU representatives beforehand.

MB3842/MB3845

■ ELECTRICAL CHARACTERISTICS (per 1 ch)

• MB3842/MB3845

(V^IN= 5 V, Ta = +25°C)

Value

Unit

Parameter

Symbol

Condition

Min.

—

Typ.

100

350

1.0

Max.

150

550

1.5

Switch resistance

R^ON

I^IN1

I^SW=0.6A

I^SW= 0 A

I^SW= 0.6 A

mΩ

µA

—

I^IN2

—

IN pin input current

EN < 0.8V for MB3842,

EN = V^INfor MB3845

I^IN3

—

1.0

µA

V^IUH

V^IUL

V^IUHY

I^SWH

I^SWL

I^OCS

I^OCL

V^INat OC = L → H

V^INat OC = H → L

V^IUHY= V^IUH– V^IUL

R^LIM= 2.0 kΩ

2.1

1.9

2.3

2.1

200

0.6

0.1

5.0

—

2.5

2.3

300

0.78

0.14

—

UVLO threshold

UVLO hysteresis width

Switch current limit

100

0.42

0.06

2.0

R^LIM= 6.2 kΩ

V^OC= 0.4 V at OC active

V^OC= 5.0 V at OC non-active

—

µA

°C

OC sink current

—

1.0

—

Temperature protection (T^j)

OUT pin rise time

T^LIM

+125

—

SS pin: Open

OUT pin: 100 kΩ pull down

t^ON

—

100

200

120

µs

SS pin: Open

OUT pin: 100 kΩ pull down

OUT pin fall time

t^OFF

• MB3842

(V^IN= 5 V, Ta = +25°C)

Value

Unit

Parameter

Symbol

Condition

Min.

—

Typ.

Max.

I^ENH

I^ENL

V^EN= 5 V, I^SW= 0 A

µA

ENABLE pin input current

V^EN= 0 V, I^SW= 0 A

—

0.0

—

V^THEN

V^TLEN

V^ENHY

—

1.45

1.25

100

1.60

1.40

200

1.75

1.55

300

ENABLE pin threshold

voltage

ENABLE hysteresis width

V^ENHY= V^THEN– V^TLEN

• MB3845

(V^IN= 5 V, Ta = +25°C)

Value

Unit

Parameter

Symbol

Condition

Min.

—

Typ.

0.0

—

Max.

I^ENH

I^ENL

V^EN= 5 V, I^SW= 0 A

—

µA

ENABLE pin input current

ENABLE pin input voltage

V^EN= 0 V, I^SW= 0 A

—

V^ILEN

V^IHEN

—

0.8

5.0

3.0

—

MB3842/MB3845

■ DIAGRAM

• Normal operation

5 V

VIN

Low

SW OFF

SW ON

5 V

VOUT

Overcurrent does not occur

IOUT

5 V

• At V^INfall

2.3 V

VIN

2.1 V

Low

SW ON

5 V

VOUT

Overcurrent does not occur

OUT

5 V

= 0 V

Note: The OC pin should be pulled up using a separate power supply and resistance.

(This illustration shows pull-up with a separate 5V source.)

(Continued)

MB3842/MB3845

(Continued)

• At overcurrent detection

5 V

VIN

Low

SW ON

OFF

5 V

OUT

5 V

= 0 V

5 V

• At over-temperature occurrence

Over-temperature

VIN

Over-temperature corrected

occurs

Low

5 V

SW ON

SW OFF

OUT

Overcurrent does not

occur

OUT

5 V

= 0 V

Latch released

Latch set

Note: The OC pin should be pulled up using a separate power supply and resistance.

(This illustration shows pull-up with a separate 5V source.)

MB3842/MB3845

■ TYPICAL CHARACTERISTICS

• R^LIMvs. limit current characteristics

ThesearethelimitingvaluecharacteristicsforCSpin-to-GND

external resistance and output current (OC flag).

VIN = 5.0 V

V^IN= 3.3 V

V^IN= 2.5 V

0.1

0.01

100

1000

10000

100000

R^LIM(Ω)

• C^SSvs. T^ON(SS) characteristics

There are the characteristics for SS pin-to-GND external

capacitance and output ON time.

100

VIN = 5.0 V

V^IN= 3.3 V

V^IN= 2.5 V

0.1

100

1000

10000

100000

C^SS(pF)

(Continued)

MB3842/MB3845

(Continued)

• SW resistance vs. temperature characteristics

150

140

130

120

110

100

at 0.1 A

at 0.6 A

at 1 A

−60

−40

−20

100

120

Temperature Ta (°C)

• Temperature-dependedSWresistancevs. V^IN(V)characteristics

150

140

130

120

110

100

−40 °C

25 °C

100 °C

V^INvoltage (V)

(Continued)

MB3842/MB3845

(Continued)

• Output power (I^SW) saturation characteristics

5 V

Measurement circuit

VIN

EN, EN OC

V^IL/VIH

I^SW

“Open”

OUT

GND

2 Ω

100 kΩ

RLIM

VSW

5 V

These are the output saturation current characteristics in

overcurrent state.(when not controlled by the OC pin warning flag)

1600

1400

1200

1000

800

600

400

200

R^LIMnot limited (CS GND)

R^LIMset to 2.0kΩ, 0.6A

Unlimited

6.2 k (0.1 A)

2 k (0.6 A)

Overcurrent flag set

(when set for 0.6A)

Temperature protection

range

R^LIMset to 6.2kΩ, 0.1A

Overcurrent flag set

(when set for 0.1A)

VSW (V)

(Continued)

MB3842/MB3845

(Continued)

• OC pin flag pull-up resistance (pull-up power 5V) dependant overcurrent operation

1 V / 500 NS

50 kΩ

1 V / 500 NS

1 kΩ

GND

1 V / 500 NS

10 kΩ

1 V / 500 NS

100 kΩ

• Power derating characteristics

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

−20

100

Temperature Ta (°C)

MB3842/MB3845

■ FUNCTIONAL DESCRIPTION

Current Limit Setting

By placing resistance between the CS and GND pins, the current limit can be set between 100mA and 600mA

within ±30% accuracy (V^IN= 5 V, current limit at 600mA). Because the setting value is dependent on V^INvoltage,

the user should select the optimum resistance value for the value of V^INvoltage . When the switching current

exceeds the set value, the OC pin goes to “L” level as an external notification signal, but there is no latching

function. To hold operation on “off” state, the input signal to the EN and EN pins should be used.

When a direct connection to GND is used, there is no current limitation.

When the connection is open, the switch is in a state of continuously held current limits.

Thermal Shutdown

The MB3842/MB3845 has a thermal shutdown function which turns the switch off and sets the latch to protect

the device when junction temperature exceeds 125°C.

At the same time the OC output signal goes to “L” level to notify external systems.

The latch function can be reset by sending a low signal to the EN input of the MB3842, or a high signal to the

EN input of the MB3845.

Slow Start

The on/off switching time can be delayed by applying capacitance between the SS and GND pins. Controlling

the on time can soften surge current to the load side capacitance when power is turned on.

For details, see “Css vs. t^ON(SS) characteristics” on p. 9.

UVLO

A V^INvoltage monitoring function is provided, so that when V^INvoltage exceeds 2.3 V (typ) the OC pin voltage

goes to “H” level. When V^INvoltage falls below 2.1V (typ), the OC output goes to “L” state.

Error Flag OC Pin

The OC pin produces a “L” signal in case of a UVLO, overcurrent, or over-temperature condition. In case of

overcurrent, the output has a pulse waveform. See P12.

(note) Output current limit setting resistance values are shown on P9, and in the following table. (CS pin-to-GND)

Standard Values

V^IN/I^SW

V^IN5.0V

V^IN3.3V

V^IN2.5V

0.1 A

0.2 A

0.3 A

0.4 A

0.5 A

0.6 A

0.7 A

0.8 A

0.9 A

1.0 A

6.2 kΩ 4.3 kΩ 3.3 kΩ 2.7 kΩ 2.2 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 1.4 kΩ 1.3 kΩ

9.1 kΩ 5.6 kΩ 4.3 kΩ 3.3 kΩ 2.7 kΩ 2.4 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ 1.5 kΩ

13 kΩ

7.5 kΩ 5.1 kΩ 3.9 kΩ 3.0 kΩ 2.7 kΩ 2.2 kΩ 2.0 kΩ 1.8 kΩ 1.6 kΩ

MB3842/MB3845

■ TYPICAL APPLICATION

Top View

MB3842/MB3845

EN1

GND

OC1

Control signal

Pull-up resistance

CSS

SS1

RLIM

OUT1

CS1

VIN1

Load

VIN2

OUT2

OC2

Load

RLIM

CS2

SS2

Pull-up resistance

CSS

EN2

GND

Control signal

MB3842/MB3845

■ APPLICATION EXAMPLE

(1) Dual-Port Self-Powered Hub Application (NON-GANG Mode Connection)

USB 5 V Controller

Overcurrent

MB3842/MB3845

ON/OFF

GND

EN1,EN1

SS1

OC1

OUT1

CS1

VIN1

OUT1

USB

Port 1

Power Supply

5 V

OUT2

OC2

VIN2

USB

Port 2

VIN2

CS2

SS2

GND

EN2,EN2

*The MB3842 can also be adapted for use with 3.3V controllers.

USB Port 500mA MAX Par Port

Smoothing capacitors should be placed between V^INand GND, or between OUT and GND as required.

MB3842/MB3845

(2) Dual-Port Bus Powered Hub Application (GANG Mode Connection)

USB

Overcurrent

MB3842/MB3845

ON/OFF

GND

EN1,EN1

OC1

SS1

USB Port1(×4)

OUT1

OUT2

OC2

CS1

VIN1

VIN2

CS2

400 mA MAX

(100 mA ×4)

5 V

Upstream Port

USB Port2(×4)

400 mA MAX

(100 mA ×4)

SS2

EN2,EN2

GND

USB Port 100mA MAX Par Port

Smoothing capacitors should be placed between V^INand GND, or between OUT and GND as required.

MB3842/MB3845

■ USAGE PRECAUTION

1. Never use settings exceeding maximum rated conditions.

Exceeding maximum rated conditions may cause permanent damage to the LSI.

Also, it is recommended that recommended operating conditions be observed in normal use.

Exceeding recommended operating conditions may adversely affect LSI reliability.

2. Use this device within recommended operating conditions.

Recommended operating conditions are values within which normal LSI operation is warranted.

Standard electrical characteristics are warranted within the range of recommended operating conditions and

within the listed conditions for each parameter.

3. Printed circuit board ground lines should be set up with consideration for common

impedance.

4. Take appropriate static electricity measures.

• Containers for semiconductor materials should have anti-static protection or be made of conductive material.

• After mounting, printed circuit boards should be stored and shipped in conductive bags or containers.

• Work platforms, tools, and instruments should be properly grounded.

• Working personnel should be grounded with resistance of 250 kΩ to 1 MΩ between body and ground.

5. Do not apply negative voltages.

The use of negative voltages below –0.3 V may create parasitic transistors on LSI lines, which can cause

abnormal operation.

6. Reverse Current Prevention Function

Current cannot flow back to the V^INpin with the switch off, even when the OUT pin voltage is higher than the

V^INpin (OUT ≥ V^IN), however when V^INpin voltage is lower than 1.5 V circuit functions are lost, so that in this

case there is danger of reverse current flow. For applications in which reverse flow is not acceptable, set

V^IN≥ 1.5 V.

■ ORDERING INFORMATION

Part number

MB3842PFV

MB3845PFV

MB3845PFV-ER

Package

Remarks

20-pin Plastic SSOP

(FPT-20P-M03)

MB3842/MB3845

■ PACKAGE DIMENSION

*: These dimensions do not include resin protrusion.

20-pin plastic SSOP

(FPT-20P-M03)

1.25 –⁺0⁰.^.1²0⁰

6.50±0.10(.256±.004)

(Mounting height)

.049 ⁺^–.^.⁰⁰⁰⁰⁴⁸

0.10(.004)

INDEX

4.40±0.10 6.40±0.20

(.173±.004) (.252±.008)

5.40(.213)

NOM

"A"

0.22 –⁺0⁰.^.0¹5⁰

.009 –⁺.^.0⁰0⁰2⁴

0.15 –⁺0⁰.^.0⁰2⁵

.006 ⁺^–.^.⁰⁰⁰⁰¹²

Details of "A" part

0.10±0.10(.004±.004)

0.65±0.12

(.0256±.0047)

(STAND OFF)

10°

0.50±0.20

(.020±.008)

5.85(.230)REF

Dimensions in mm (inches).

1994 FUJITSU LIMITED F20012S-2C-4

MB3842/MB3845

FUJITSU LIMITED

For further information please contact:

Japan

FUJITSU LIMITED

Corporate Global Business Support Division

Electronic Devices

KAWASAKI PLANT, 4-1-1, Kamikodanaka

Nakahara-ku, Kawasaki-shi

Kanagawa 211-8588, Japan

Tel: 81(44) 754-3763

The contents of this document are subject to change without

notice. Customers are advised to consult with FUJITSU sales

representatives before ordering.

Fax: 81(44) 754-3329

http://www.fujitsu.co.jp/

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

Fax: (408) 922-9179

Customer Response Center

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

Tel: (800) 866-8608

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

CAUTION:

Fax: (408) 922-9179

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.

http://www.fujitsumicro.com/

Europe

FUJITSU MICROELECTRONICS EUROPE 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-fme.com/

Asia Pacific

FUJITSU MICROELECTRONICS ASIA PTE LTD

#05-08, 151 Lorong Chuan

New Tech Park

Singapore 556741

Tel: (65) 281-0770

Fax: (65) 281-0220

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.

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

F0001

FUJITSU LIMITED Printed in Japan

MB3845PFV [FUJITSU]

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