Fujitsu MB3842 Manuale utente

DS04-27604-2E

FUJITSU SEMICONDUCTOR

DATA SHEET

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 (VIN >2.5V)

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

100mAto600mAbyusingexternalresistance,andwhenovercurrentconditionsaredetectedtheOCoutputgoes

low to provide an external notification signal.

VIN is 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 :V

IN threshold 2.3V/2.1 V hysteresis 200 mV

• ENABLE :EN threshold EN 1.4V/1.6 V for MB3842, EN 1/2 VIN for MB3845

:Power supply current at output off = 0µA EN < 0.8V for MB3842, EN =VIN for 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 (VIN ≥1.5 V)

• Either channel may be operated alone.

■PACKAGE

20-pin plastic SSOP

(FPT-20P-M03)

MB3842/MB3845

■PIN ASSIGNMENT

GND

OC1

OUT1

OUT2

OC2

GND

EN1, EN1

SS1

CS1

VIN1

VIN2

CS2

SS2

EN2, EN2

SSOP-20P

(FPT-20P-M03)

EN Enable

CS Current Set OC Over Current

EN Enable SS Slow Start

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

1/10

(MB3842)

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.

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

(MB3845)

Control signal input pin.

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

At “H” level = VIN, 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 VIN -0.5V or greater.

2/9 SS 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.

3/8 CS Current limit setting pin.

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

4/5/6/7 VIN

Switch output pin.

An UVLO (VIN power monitor function) is provided so that when VIN reaches 2.3V

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

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

200mV (typ) hysteresis is provided.

11/20 GND Ground pin.

12/19 OC

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.

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)

SS1

EN1

VIN1

OSC1

BGR1

−

COMP

FF1

OC1

OUT1

CS1

−

COMP

MB3842

SS1

EN1

VIN1

OSC1

BGR1

−

COMP

FF1

OC1

OUT1

CS1

−

COMP

MB3845

Temperature

protection 1

Charge

pump1 Over current

detection 1

Charge

pump1 Over current

detection 1

Temperature

protection 1

MB3842/MB3845

■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

* :For CSS, RLIM settings, 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.

Parameter Symbol Condition Rating Unit

Max. Min.

Input voltage VIN — –0.3 7.0 V

ENABLE voltage VEN — –0.3 7.0 V

Switch current ISW ——1.8A

Power dissipation PDTa = +85°C — 216 mW

Storage temperature TSTG — –55 +125 °C

Parameter Symbol Condition Value Unit

Min. Typ. Max.

Input voltage VIN —2.55.05.5V

ENABLE voltage VEN VEN ≤VIN 0—5.5V

Switch current ISW VIN = 2.5 V to 5.5 V — — 0.6 A

SS pin capacitance CSS* — — — 10 nF

OC sink current IOCS VIN = 5.0 V, VOC = 0.4 V 2.0 5.0 — mA

Current limit

resistance RLIM*VIN = 5.0 V (ISW = 0.6 A) 1.4 2.0 2.6 kΩ

VIN = 5.0 V (ISW = 0.1 A) 3.6 6.2 9.1 kΩ

Operating

temperature TOP — –20 — +85 °C

MB3842/MB3845

■ELECTRICAL CHARACTERISTICS (per 1 ch)

• MB3842/MB3845 (VIN = 5 V, Ta = +25°C)

• MB3842 (VIN = 5 V, Ta = +25°C)

• MB3845 (VIN = 5 V, Ta = +25°C)

Parameter Symbol Condition Value Unit

Min. Typ. Max.

Switch resistance RON ISW =0.6A — 100 150 mΩ

IN pin input current

IIN1 ISW = 0 A — 350 550 µA

IIN2 ISW = 0.6 A — 1.0 1.5 mA

IIN3 EN < 0.8V for MB3842,

EN =VIN for MB3845 ——1.0µA

UVLO threshold VIUH VIN at OC = L →H 2.1 2.3 2.5 V

VIUL VIN at OC = H →L 1.9 2.1 2.3 V

UVLO hysteresis width VIUHY VIUHY = VIUH – VIUL 100 200 300 mV

Switch current limit ISWH RLIM = 2.0 kΩ0.42 0.6 0.78 A

ISWL RLIM = 6.2 kΩ0.06 0.1 0.14 A

OC sink current IOCS VOC = 0.4 V at OC active 2.0 5.0 — mA

IOCL VOC = 5.0 V at OC non-active — — 1.0 µA

Temperature protection (Tj)T

LIM — +125 — — °C

OUT pin rise time tON SS pin: Open

OUT pin: 100 kΩpull down — 100 200 µs

OUT pin fall time tOFF SS pin: Open

OUT pin: 100 kΩpull down —50120µs

Parameter Symbol Condition Value Unit

Min. Typ. Max.

ENABLE pin input current IENH VEN = 5 V, ISW = 0 A — 5 10 µA

IENL VEN = 0 V, ISW = 0 A — 0.0 — µA

ENABLE pin threshold

voltage VTHEN — 1.45 1.60 1.75 V

VTLEN — 1.25 1.40 1.55 V

ENABLE hysteresis width VENHY VENHY = VTHEN – VTLEN 100 200 300 mV

Parameter Symbol Condition Value Unit

Min. Typ. Max.

ENABLE pin input current IENH VEN = 5 V, ISW = 0 A — 0.0 — µA

IENL VEN = 0 V, ISW = 0 A — 0.0 — µA

ENABLE pin input voltage VILEN —0—0.8V

VIHEN —3.0—5.0V

MB3842/MB3845

■DIAGRAM

(Continued)

VIN

VOUT

IOUT

SW OFF

Overcurrent does not occur

SW ON SW ON

5 V

Low

5 V

• Normal operation

SW ONSW ONSW ON

2.3 V

2.1 V

5 V

Low

5 V

= 0 V

VIN

OUT

Overcurrent does not occur

•AtV

IN fall

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

(Continued)

SW ON OFF ON OFF

VIN

VOUT

IOUT

5 V

Low

5 V

= 0 V

• At overcurrent detection

SW ON

Over-temperature corrected

Over-temperature

occurs

SW OFF

VIN

OUT

5 V

Low

5 V

= 0 V

Overcurrent does not

occur

Latch set Latch released

• At over-temperature occurrence

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

(Continued)

VIN = 5.0 V

VIN = 3.3 V

VIN = 2.5 V

0.1

0.01100 1000 10000 100000

RLIM (Ω)

ISW(A)

•R

LIM vs. limit current characteristics

VIN = 5.0 V

VIN = 3.3 V

VIN = 2.5 V

100

0.1 10 100 1000 10000 100000

CSS (pF)

tON(ms)

•C

SS vs. TON (SS) characteristics

ThesearethelimitingvaluecharacteristicsforCSpin-to-GND

external resistance and output current (OC flag).

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

capacitance and output ON time.

MB3842/MB3845

(Continued)

150

140

130

120

110

100

50−60 −40 −20 0 20 40 60 80 100 120

at 0.1 A

at 0.6 A

at 1 A

−40 °C

25 °C

100 °C

150

140

130

120

110

100

50 234567

• SW resistance vs. temperature characteristics

• Temperature-dependedSWresistancevs.VIN (V)characteristics

SW resistance (mΩ)

Temperature Ta (°C)

SW resistance (mΩ)

VIN voltage (V)

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