Fujitsu MB3842 - Manuals - manualsarea.com

Page 2 - PIN ASSIGNMENT

2 MB3842/MB3845 ■ PIN ASSIGNMENT 20 19 18 17 16 15 14 13 12 11 GND OC1 OUT1 OUT1 OUT1 OUT2 OUT2 OUT2 OC2 GND 1 2 3 4 5 6 7 8 9 10 EN1, EN1 SS1 CS1 VIN1 VIN1 VIN2 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 p...

Page 3 - PIN DESCRIPTION; Symbol

3 MB3842/MB3845 ■ PIN DESCRIPTION Pin no. Symbol Descriptions 1/10 EN (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 1 µ A. “L” level is 1.4V (typ), “H” level is 1.6V (typ), with 200mV (t...

Page 7 - DIAGRAM; • Normal operation; • At V; fall

7 MB3842/MB3845 ■ DIAGRAM (Continued) VIN EN EN V OUT I OUT OC SW OFF Overcurrent does not occur SW ON SW ON 5 V Hi Low 5 V 5 V • Normal operation SW ON SW ON SW ON 2.3 V 2.1 V 5 V Hi Low 5 V 5 V = 0 V VIN EN EN V OUT I OUT OC Overcurrent does not occur • At V IN fall Note: The OC pin should be pull...

Page 8 - • At overcurrent detection; • At over-temperature occurrence

8 MB3842/MB3845 (Continued) SW ON OFF ON OFF VIN EN EN V OUT I OUT OC 5 V Hi Low 5 V 5 V = 0 V • At overcurrent detection SW ON Over-temperature corrected Over-temperature occurs SW OFF VIN EN EN V OUT I OUT OC 5 V Hi Low 5 V 5 V = 0 V Overcurrent does not occur Latch set Latch released • At over-te...

Page 9 - TYPICAL CHARACTERISTICS; vs. limit current characteristics

9 MB3842/MB3845 ■ TYPICAL CHARACTERISTICS (Continued) V IN = 5.0 V V IN = 3.3 V V IN = 2.5 V 10 1 0.1 0.01 100 1000 10000 100000 R LIM ( Ω ) I SW (A) • R LIM vs. limit current characteristics V IN = 5.0 V V IN = 3.3 V V IN = 2.5 V 100 10 1 0.1 10 100 1000 10000 100000 C SS (pF) t ON (ms) • C SS vs. ...

Page 11 - Measurement circuit; Temperature protection; Overcurrent flag set; Unlimited; ) saturation characteristics; “Open”

11 MB3842/MB3845 (Continued) (Continued) 5 V 5 V 100 k Ω 2 Ω VIN I SW V SW R LIM GND EN, EN OC OUT SS CS V IL /V IH A 1600 1400 1200 1000 800 600 400 200 0 0 2 3 4 5 6 1 I SW (mA) 6.2 k (0.1 A)2 k (0.6 A) V SW (V) Measurement circuit These are the output saturation current characteristics in overcur...

Page 12 - • Power derating characteristics; Power dissipation P

12 MB3842/MB3845 (Continued) • Power derating characteristics Power dissipation P D (W) 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 − 20 0 20 40 60 80 100 1 V / 500 NS 50 k Ω Temperature Ta ( ° C) 1 V / 500 NS 1 k Ω GND 1 V / 500 NS 10 k Ω 1 V / 500 NS 100 k Ω • OC pin flag pull-up resistance (pull-up p...

Page 13 - FUNCTIONAL DESCRIPTION; voltage

13 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 IN voltage, the user should s...

Page 14 - TYPICAL APPLICATION; Top View; Control signal

14 MB3842/MB3845 ■ TYPICAL APPLICATION C SS R LIM R LIM C SS EN1EN1 SS1 CS1 VIN1 VIN1 VIN2 VIN2 CS2 SS2 EN2EN2 GND OC1 OUT1 OUT1 OUT1 OUT2 OUT2 OUT2 OC2 GND MB3842/MB3845 Top View Control signal Control signal Pull-up resistance Load Load Pull-up resistance

Page 15 - APPLICATION EXAMPLE; *The MB3842 can also be adapted for use with 3.3V controllers.; and GND, or between OUT and GND as required.

15 MB3842/MB3845 ■ APPLICATION EXAMPLE (1) Dual-Port Self-Powered Hub Application (NON-GANG Mode Connection) 5 V USB 5 V Controller Overcurrent ON/OFF Power Supply USBPort 1 USBPort 2 MB3842/MB3845 EN1,EN1 SS1 CS1 VIN1 VIN1 VIN2 VIN2 CS2 SS2 EN2,EN2 GND OC1 OUT1 OUT1 OUT1 OUT2 OUT2 OUT2 OC2 GND *The...

Page 17 - USAGE PRECAUTION; Never use settings exceeding maximum rated conditions.; to 1 M; Do not apply negative voltages.; Current cannot flow back to the V; ORDERING INFORMATION; Part number

17 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 m...

Page 18 - PACKAGE DIMENSION

18 MB3842/MB3845 ■ PACKAGE DIMENSION C 1994 FUJITSU LIMITED F20012S-2C-4 0.50±0.20 (.020±.008) 0.10±0.10(.004±.004) (STAND OFF) 0 10° Details of "A" part 5.85(.230)REF 6.50±0.10(.256±.004) * 0.65±0.12 5.40(.213) 4.40±0.10 6.40±0.20 NOM (.252±.008) (.173±.004) * (.0256±.0047) .006 –.001 +.002...

Page 19 - FUJITSU LIMITED; FUJITSU LIMITED Printed in Japan

MB3842/MB3845 FUJITSU LIMITED All Rights Reserved. The contents of this document are subject to change without notice. Customers are advised to consult with FUJITSU salesrepresentatives before ordering. The information and circuit diagrams in this document arepresented as examples of semiconductor d...