Fujitsu MB3845 Bedienungsanleitung PDF herunterladen

DS04-27604-2E

FUJITSU SEMICONDUCTOR

DATA SHEET

ASSP For Power Supply Applications

Power Management 2-ch Switch IC

MB3842/MB3845

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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

> 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.

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.

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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

threshold 2.3V/2.1 V hysteresis 200 mV

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

for MB3845

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

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 (V

≥ 1.5 V)

• Either channel may be operated alone.

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PACKAGE

20-pin plastic SSOP

(FPT-20P-M03)

1 2 3 4 5 6 ... 18 19

MB3842/MB3845 1
FUJITSU LIMITED 19

Inhaltsverzeichnis

Seite 1 - MB3842/MB3845

DS04-27604-2EFUJITSU SEMICONDUCTORDATA SHEETASSP For Power Supply ApplicationsPower Management 2-ch Switch ICMB3842/MB3845 DESCRIPTIONThe MB3842/384

Seite 2

10MB3842/MB3845(Continued)(Continued)1501401301201101009080706050−60 −40 −20 0 20 40 60 80 100 120at 0.1 Aat 0.6 Aat 1 A−40 °C25 °C100 °C1501401301201

Seite 3

11MB3842/MB3845(Continued)(Continued)5 V5 V100 kΩ2 ΩVINISWVSWRLIMGNDEN, EN OCOUTSSCSVIL/VIHA160014001200100080060040020000234561ISW (mA)6.2 k (0.1 A)2

Seite 4

12MB3842/MB3845(Continued)• Power derating characteristicsPower dissipation PD (W)10.90.80.70.60.50.40.30.20.10−20 0 20 40 60 80 1001 V / 500 NS 50 kΩ

Seite 5

13MB3842/MB3845 FUNCTIONAL DESCRIPTIONCurrent Limit SettingBy placing resistance between the CS and GND pins, the current limit can be set between 100

Seite 6

14MB3842/MB3845 TYPICAL APPLICATION CSSRLIMRLIMCSSEN1EN1SS1CS1VIN1VIN1VIN2VIN2CS2SS2EN2EN2GNDOC1OUT1OUT1OUT1OUT2OUT2OUT2OC2GNDMB3842/MB3845Top ViewCon

Seite 7

15MB3842/MB3845 APPLICATION EXAMPLE(1) Dual-Port Self-Powered Hub Application (NON-GANG Mode Connection)5 VUSB 5 V ControllerOvercurrentON/OFFPower Su

Seite 8

16MB3842/MB3845(2) Dual-Port Bus Powered Hub Application (GANG Mode Connection) USBOvercurrentON/OFF5 VUpstream PortMB3842/MB3845USB Port1(×4)USB Port

Seite 9

17MB3842/MB3845 USAGE PRECAUTION1. Never use settings exceeding maximum rated conditions.Exceeding maximum rated conditions may cause permanent damage

Seite 10

18MB3842/MB3845 PACKAGE DIMENSIONC1994 FUJITSU LIMITED F20012S-2C-40.50±0.20(.020±.008)0.10±0.10(.004±.004)(STAND OFF)0 10°Details of "A&qu

Seite 11

Seite 12

2MB3842/MB3845 PIN ASSIGNMENT20191817161514131211GNDOC1OUT1OUT1OUT1OUT2OUT2OUT2OC2GND12345678910EN1, EN1SS1CS1VIN1VIN1VIN2VIN2CS2SS2EN2, EN2SSOP-20P(F

Seite 13

3MB3842/MB3845 PIN DESCRIPTIONPin no. Symbol Descriptions1/10EN(MB3842)Control signal input pin.Set “H” to turn switch on, “L” to turn toff. At 0.8 V

Seite 14

4MB3842/MB3845 BLOCK DIAGRAM (for 1 channel)SS1EN1VIN1OSC1BGR1+−COMPFF1QSROC1OUT1CS1+−COMPMB3842SS1EN1VIN1OSC1BGR1+−COMPFF1QSROC1OUT1CS1+−COMPMB3845Te

Seite 15

5MB3842/MB3845 ABSOLUTE MAXIMUM RATINGSWARNING: Semiconductor devices can be permanently damaged by application of stress (voltage, current, temperatu

Seite 16

6MB3842/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

Seite 17

7MB3842/MB3845 DIAGRAM (Continued)VINENENVOUTIOUTOCSW OFFOvercurrent does not occurSW ON SW ON5 VHiLow5 V5 V• Normal operationSW ONSW ONSW ON2.3 V2.1

Seite 18

8MB3842/MB3845(Continued)SW ONOFF ON OFFVINENENVOUTIOUTOC5 VHiLow5 V5 V = 0 V• At overcurrent detectionSW ONOver-temperature correctedOver-temperature

Seite 19 - FUJITSU LIMITED

9MB3842/MB3845 TYPICAL CHARACTERISTICS(Continued)VIN = 5.0 V VIN = 3.3 V VIN = 2.5 V 1010.10.01100 1000 10000 100000RLIM (Ω)ISW(A)•RLIM vs. limit curr