MB3841PF-G-BND - Fujitsu Limited

DS04-27603-1Ea

FUJITSU MICROELECTRONICS

DATA SHEET

1998.9

ASSP For Power Supply Applications

Power Management Switch IC

MB3841

■DESCRIPTION

The FUJITSU MICROELECTRONICS MB3841 is a one-channel power management switch IC with extremely

low on resistance.

The MB3841 is designed for a variety of switching applications, featuring operation from low input voltages

(VIN > 2.2 V) and stable on resistance that does not depend on input voltage. The switch current limit can be

externally set over a wide range from 100 mA to 2 A. A safety function detects overcurrent conditions, immediately

sets the switch to off mode and send s an external notification signal. The MB3841 is therefore idea l for power

management switching applications with USB specifications.

In addition, the MB3841 has features that ensure accurate on-off switching by preventing reverse current in off

mode, as well as rapid discharge of capacitors connected to output.

■FEATURES

• Low on resistance switch (typ. 45 mΩ)

• Low input voltage operation (2.2 V to 5.5 V)

• Switch current (max. 2 A)

•UVLO (V

TH = 1.9 V)

• External settings for soft start time and switch current limit

• On-chip overheating and overcurrent detection (output off latc hing)

• On-chip abnormal state detection circuit (O.C. pin)

• On-chip output pin d ischarge control circu it

• Supply current = 0 µA in standby mode (CO NTROL < 0.8 V)

• Reverse current protection function in off mode

MB3841

■PACKAGE

■PIN ASSIGNMENT

8-pin Plastic SOP

(FPT-8P-M01)

CONTROL

CURRENT

VIN

O.C

GND

VCC

OUT

(TOP VIEW)

MB3841

■PIN DESCRIPTION

Pin no. Symbol Descriptions

1 CONTROL Control signal input p in. Set “H” to turn the switch on, “L” to turn the switch off .

At 0.8 V or less, the chip is in STBY state and current consumption is less

than1µA.

2SS

Slow start setting pin. Used to ad ju st the switch on/off timing.

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

In open mode voltage s u p to 10 V ar e presen t. Car e sh ould be t aken in mo untin g

to prevent leak current generation because high impedance is required.

3 CURRENT Current limit setting pin. The limit current level is set by connecting this pin to

extern al resist ance.

If this pin is connected to GND, no current limit is applied.

IN Switch input pin.

The VIN voltage monitoring function enables switch operation at 1.9 V or higher.

If the VIN voltage drops to 1.8 V or lower switch operation is disabled.

5OUT

Switch output pin.

The discharge function will immediately discharge the capacitance charge

connected to the OUT pin when the switch is in off position and 350 Ω re sistance

(with VCC = 5 V) is connected to the GND terminal.

CC Control power supply input pi n. This pin supplies power to the control circuit.

The input voltage level must be stable.

7 GND Ground pin.

8O.C

External signal pin.

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

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

detected.

When the switch is in off mode this signal is output at “L” level at all times.

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

resistance.

MB3841

■BLOCK DIAGRAM

−

VIN

Charge pump load current

detection

Temperature

protection

OSC

VCC

CONTROL

GND

BGR

COMP

(HYS)

COMP

(HYS)

COMP

DISCHARGE

O.C

OUT

CURRENT

MB3841

■ABSOLUTE MAXIMUM RATINGS

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

Note: For CSS, RLIN settings, see p. 9.

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

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

operated within these ranges.

Alwa ys use semiconductor devices within their recommended operating condition ranges. Operation

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

No wa rranty 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

representativ es beforehand.

Parameter Symbol Condition Rating Unit

Max. Min.

Input voltage VIN —–0.37.0V

Power supply voltage VCC —–0.37.0V

Control v oltage VCTL —–0.37.0V

Switch current ISW VIN = 2.2 V to 5.5 V, Ta = +25°C — 3 A (DC) A

Allowable dissipation PDTa = +85°C—280mW

Storage temperature TSTG — –55 +125 °C

Parameter Symbol Condition Value Unit

Min. Typ. Max.

Input voltage VIN —0—5.5V

P o wer supply v oltage VCC —0—5.5V

Control v oltage VCTL VCTL VCC 0—5.5V

Switch current ISW VIN = 2.2 V to 5.5 V,

VCTL = 2.2 V to 5.5 V ——2.0A

SS pin capacitance CSS ———10nF

Current limit

resistance RLIN VIN = 5.0 V (ISW = 2 A to 0.1 A) 1.8 — 24 kΩ

VIN = 2.2 V (ISW = 2 A to 0.1 A) 2.2 — 51 kΩ

O.C sync current IOC VIN = 2.2 V to 5.5 V, VCC 2.2 V ——1.0mA

Operating

temperature TOP —–20—+85°C

MB3841

■ELECTRICAL CHARACTERISTICS

(VIN = 5 V, VCC = 5 V, Ta = +25°C)

Parameter Symbol Condition Value Unit

Min. Typ. Max.

Switch resistance RON VIN = 5 V, VCTL = 3 V, ISW = 2 A — 45 70 mΩ

IN pin disable current

IIN1 VIN = 5 V, VCTL = 3 V, ISW = 0 A — 170 340 µA

IIN2 VIN = 5 V, VCTL = 3 V, ISW = 2 A — 0.9 1.8 mA

IIN3 VIN = 5 V, VCTL = 0.4 V — — 1.0 µA

VCC power supply current ICC1 VIN = 5 V, VCTL = 3 V, ISW = 2 A — 105 210 µA

ICC2 VIN = 5 V, VCTL = 0.4 V — — 1.0 µA

UVLO threshold VIUH VCC = 5 V, VIN at O.C. = L → H 1.7 1.9 2.1 V

VIUL VCC = 5 V, VIN at O.C. = H → L 1.6 1.8 2.0 V

UVLO histeresis spread VIUHY VIUHY = VIUH – VIUL 50 100 150 mV

CONTROL pin inp ut current ICTL VCTL = 5 V, ISW = 0 A — 5.0 10 µA

CONTROL pin threshold VTHCTL VCC = 2.2 V, VCTL at O.C. = L → H 1.2 1.35 1.5 V

VTLCTL VCC = 2.2 V, VCTL at O. C. = H → L 1.0 1.15 1.3 V

CONTROL pin histeresis

spread VCTLHY VCTLHY = VTHCTL – VTLCTL 100 200 300 mV

Switch current limit

ISWLL1 VIN = 5 V RLIM = 24 kΩ, VCTL = 2.2 V 73 105 137 mA

ISWLH1 RLIM = 1.8 kΩ, VCTL = 2.2 V 1.57 1.97 2.37 A

ISWLL2 VIN = 2.2 V RLIM = 51 kΩ, VCTL = 2.2 V 68 98 128 mA

ISWLH2 RLIM = 2.2 kΩ, VCTL = 2.2 V 1.53 1.92 2.31 A

O.C sync current IOCS VCC = 5 V, VCTL = 0.8 V, VOC = 0.4 V 1.0 — — mA

O.C leak current IOCL VCC = 5 V, VCTL = 3 V, VOC = 5.0 V — — 2.0 µA

Switch discharge

resistance RDCG VCC = 5 V, VCTL = 0.8 V, VOUT = 5.0 V — 350 700 Ω

Temperature protection (Tj)TLIM VCC = 5 V, VCTL = 2.2 V +125 — — °C

OUT pin rise time tON1 VCC = 5 V, VIN = 5 V, SS, OUT: Open — 300 900 µs

tON2 VCC = 5 V, VIN = 2.2 V, SS, OUT: Open — 610 1830 µs

OUT pin fall time tOFF1 VIN = 5 V, VCC = 5 V, SS, OUT: Open — 10 50 µs

tOFF2 VIN = 5 V, VCC = 2.2 V, SS, OUT: Open — 50 250 µs

MB3841

■DIAGRAM

1. Normal operation

2. At VIN Fall

VCC

VIN

CONTROL

VOUT

O.C

DISCHARGE logic

1.35 V 1.15 V

90%90%

10%10%

tON

ONOFF

tOFF

VCC

VIN

CONTROL

VOUT

O.C

1.8 V 1.9 V

ON OFF

DISCHARGE logic

MB3841

3. At V OUT short

VCC

VIN

CONTROL

VOUT

O.C

1.15 V

ON ONOFF

Over current latch

DISCHARGE logic Latch set Latch release

MB3841

■TYPICAL CHARACTERISTICS

1. RLIM vs. Limit Current Characteristics

2. CSS vs. TON (SS) Characteristics

0.1

1000 10000 100000

RLIM (Ω)

RLIM – lSW

ISW(A)

VIN = 2.2 V

VIN = 3.3 V

VIN = 5 V

VIN = 2.2 V

VIN = 3.3 V

VIN = 5 V

100

0.1 100 1000 10000

CSS (pF)

CSS – tON

tON (msec)

MB3841

3. SW Resistance Temperature Characteristics

100

−60 −40 −20 0 20 40 60 80 100 120

Ta (°C)

SW resistance (mΩ)SW resistance (mΩ)

Temperature dependency of SW resistance (VIN = 5 V, lOUT = 2 A, Ta: Ambient temperature)

VIN voltage dependency of SW resistance (lOUT = 2 A, Ta = −40, +25, +100°C)

−40°C

+25°C

+100°C

100

234567

VIN (V)

MB3841

■FUNCTIONAL DESCRIPTION

Current Limit Setting

The MB3841 provides highly accur ate switching current setting, in the range 100 mA to 2 A ±20% (with limit

setting current at 2 A) by placing resistance between the CURRENT and GND pins.

Because the setting is dependent on the VIN voltage, it is important that the appropriate resistance be connected

to the VIN pin.

The following approximation formula (1) may be used to calculate the limit setting when VIN = 5V.

For details, see “ RLIM vs. Limit Current Characteristics” on p. 9.

When the switch limit level is exceeded, the switch turns off and then latch is set to protect the device.

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

When a “L” level signal is applied to the CONTROL switch, the latch is released, so that normal op eration is

resumed at the next “H” level signal to the CONTROL switch.

Thermal Shutdown

The MB3841 has a thermal shutdown function which turns the switch off and sets the latch to protect the device

when junction temperat ure exceeds 125°C.

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

When a “L” level signal is applied to the CONTROL switch, the lat ch is released,so that normal operation is

resumed at the next “H” level signal to the CONTROL switch.

Slow Start

The on/off switching time of the MB3841 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.

(tON, tOff are measured at 90% of VOUT.)

The following approximation formula (2) may be used to set on time when VIN = 5 V.

For details, see “Css vs. tON (SS) Characteristics” on p. 9.

DISCHARGE

The MB3841 has a DISCHARGE pin function that immediately discharges electric charge on the load side when

the switch is turned off.

ISW = [A]

7450

(RLIM[Ω])1.1 .... (1)

tON = 0.87 × 10–3 × CSS[pF] + 0.3 ....(2)

[ms]

MB3841

■TYPICAL APPLICATION

CONTROL

CURRENT

VIN

Control signal Pull up resistance

load

O.C

GND

VCC

OUT

CSS

RLIM

MB3841

■SAMPLE APPLICATIONS

(1) Bus Supplied Hub (GANG Mode Connection)

MB3841

CONTROL

Pull up resistance

Down-port

100 mA max/port

CSS

RLIM CURRENT

VIN

O.C

GND

VCC

OUT

5 V

USB controller

Bus Supply (Up-board)

MB3841

(2) Self Supplied Hub (NON-GANG Mode Connection)

MB3841 Pull up

resistance

Pull up

resistance

Pull up

resistance

Pull up resistance

USB controller

500 mA max

CONTROL

Self supply

CSS

RLIM CURRENT

VIN

O.C

GND

VCC

OUT

MB3841

CONTROL

CSS

RLIM CURRENT

VIN

O.C

GND

VCC

OUT

MB3841

CONTROL

CSS

RLIM CURRENT

VIN

O.C

GND

VCC

OUT

MB3841

CONTROL

CSS

RLIM CURRENT

VIN

O.C

GND

VCC

OUT

5 V

3.3 V

Down-port

MB3841

■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 ele ctrical characteristics are warranted within the ra nge 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 f or se miconductor mate rials should have anti -static p rotec tion o r be ma de of co nductive material.

• After mounting, printed circuit boards should be stored and shipped in cond uctive 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 groun d .

5. Do not apply negative voltages.

The use of neg at ive vo lta ge s be low –0.3 V may create parasitic transistors on LSI lines, which can cause

abnormal operat ion.

■ORDERING IN FORMATION

Part number Package Remarks

MB3841 PF-G-BND 8-pin Plastic SOP

(FPT-8P-M01)

MB3841

■PACKAGE DIMENSION

8-pin Plastic SOP

(FPT-8P-M01)

+0.40

–0.20

+.016

–.008

+0.05

–0.02

+.002

–.001

+0.25

–0.20 +.010

–.008

3.81(.150)REF

1.27(.050)

TYP

INDEX 6.80

.268

0.15

.006

6.35 .250

(.307±.016)(.209±.012)

(.018±.004)

(STAND OFF)

(.020±.008)

0.50±0.20

5.30±0.30 7.80±0.40

0.05(.002)MIN

2.25(.089)MAX

0.45±0.10

Details of "A" part

0.50(.020)

0.20(.008)

0.18(.007)MAX

0.68(.027)MAX

"A"

Ø0.13(.005)

0.10(.004)

1994 FUJITSU LIMITED F08002S-4C-4

CDimensions in mm (inches)

MB3841

MEMO

MB3841

MEMO

MB3841

MEMO

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For further information please contact:

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of reference to show examples of operations and uses of FUJITSU MICROELECTRONICS device; FUJITSU MICROELECTRONICS

does not warrant proper operation of the device with respect to use based on such information. When you develop equipment incorporat-

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