MB3841 Fujitsu, MB3841 Datasheet

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MB3841

Manufacturer Part Number
MB3841
Description
Manufacturer
Fujitsu
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MB3841
Manufacturer:
FUJITSU/富士通
Quantity:
20 000
Company:
Part Number:
MB3841PF-G-BND-JN-ER
Quantity:
517
Part Number:
MB3841PF-G-BND-JN-ERE1
Manufacturer:
FUJI/富士电机
Quantity:
20 000
FUJITSU SEMICONDUCTOR
ASSP For Power Supply Applications
Power Management Switch IC
MB3841
DESCRIPTION
The FUJITSU 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
(V
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 sends an external notification signal. The MB3841 is therefore ideal 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 m )
• Low input voltage operation (2.2 V to 5.5 V)
• Switch current (max. 2 A)
• UVLO (V
• External settings for soft start time and switch current limit
• On-chip overheating and overcurrent detection (output off latching)
• On-chip abnormal state detection circuit (O.C. pin)
• On-chip output pin discharge control circuit
• Supply current = 0 A in standby mode (CONTROL < 0.8 V)
• Reverse current protection function in off mode
PACKAGE
DATA SHEET
IN
> 2.2 V) and stable on resistance that does not depend on input voltage. The switch current limit can be
TH
= 1.9 V)
8-pin Plastic SOP
(FPT-8P-M01)
DS04-27603-1E

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MB3841 Summary of contents

Page 1

... IN externally set over a wide range from 100 safety function detects overcurrent conditions, immediately sets the switch to off mode and sends an external notification signal. The MB3841 is therefore ideal 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 ...

Page 2

... MB3841 PIN ASSIGNMENT CONTROL SS CURRENT O.C GND V CC OUT (TOP VIEW) ...

Page 3

... 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. Descriptions voltage drops to 1 lower switch operation is disabled connected to the GND terminal. MB3841 resistance 3 ...

Page 4

... MB3841 BLOCK DIAGRAM V IN Charge pump SS OSC V CC BGR CONTROL GND 4 SW load current detection COMP (HYS COMP (HYS) OUT CURRENT Temperature protection COMP DISCHARGE O.C ...

Page 5

... V CTL 5.5 V CTL — — MB3841 Rating Unit Max. Min. –0.3 7.0 V –0.3 7.0 V –0.3 7.0 V — (DC) A — 280 mW –55 +125 C Value Unit Min. Typ. ...

Page 6

... MB3841 ELECTRICAL CHARACTERISTICS Parameter Symbol Switch resistance IN1 IN pin disable current I IN2 I IN3 I CC1 V power supply current CC I CC2 V IUH UVLO threshold V IUL UVLO histeresis spread V IUHY CONTROL pin input current I CTL V THCTL CONTROL pin threshold V TLCTL CONTROL pin histeresis ...

Page 7

... DIAGRAM 1. Normal operation CONTROL V OUT O.C DISCHARGE logic Fall CONTROL V OUT O.C DISCHARGE logic ON 1. OFF OFF 1.9 V 1.8 V OFF MB3841 ON 7 ...

Page 8

... MB3841 short OUT CONTROL V OUT O.C Over current latch DISCHARGE logic ON 8 1.15 V Latch set Latch release OFF ON ...

Page 9

... TYPICAL CHARACTERISTICS 1. R vs. Limit Current Characteristics LIM 10 1 0.1 1000 2. C vs. T (SS) Characteristics SS ON 100 10 1 0.1 100 R – l LIM SW 10000 100000 LIM C – 1000 10000 C (pF) SS MB3841 ...

Page 10

... MB3841 3. SW Resistance Temperature Characteristics Temperature dependency of SW resistance (V 100 voltage dependency of SW resistance (l IN 100 Ta: Ambient temperature) IN OUT 40, +25, +100 C) ...

Page 11

... 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 temperature exceeds 125 C. At the same time the O.C output signal goes to “L” level to notify external systems. ...

Page 12

... MB3841 TYPICAL APPLICATION Control signal LIM 12 O.C CONTROL GND SS V CURRENT CC OUT V IN Pull up resistance load ...

Page 13

... SAMPLE APPLICATIONS (1) Bus Supplied Hub (GANG Mode Connection) Bus Supply (Up-board USB controller MB3841 CONTROL O GND R LIM V CURRENT CC V OUT IN MB3841 Pull up resistance Down-port 100 mA max/port 13 ...

Page 14

... CONTROL O.C Pull C SS resistance SS GND R LIM V CURRENT CC V OUT IN MB3841 CONTROL O.C Pull C SS resistance SS GND R LIM V CURRENT CC V OUT IN MB3841 CONTROL O.C Pull GND R LIM V CURRENT CC V OUT IN Down-port 500 mA max up Down-port 500 mA max up Down-port 500 mA max up resistance Down-port 500 mA max ...

Page 15

... Working personnel should be grounded with resistance of 250 between body and ground 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. ORDERING INFORMATION Part number MB3841 PF-G-BND Package 8-pin Plastic SOP (FPT-8P-M01) MB3841 Remarks ...

Page 16

... MB3841 PACKAGE DIMENSION 8-pin Plastic SOP (FPT-8P-M01) +0.25 +.010 6.35 .250 –0.20 –.008 INDEX 1.27(.050) TYP 3.81(.150)REF "A" 0.10(.004) 1994 FUJITSU LIMITED F08002S-4C 5.30±0.30 7.80±0.40 (.209±.012) (.307±.016) 0.45±0.10 Ø0.13(.005) M (.018±.004) 2.25(.089)MAX 0.05(.002)MIN (STAND OFF) +0 ...

Page 17

... MB3841 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU sales representatives before ordering. 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, ...

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