MB3842 Fujitsu Microelectronics, Inc., MB3842 Datasheet

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MB3842

Manufacturer Part Number
MB3842
Description
Power Management 2-ch Switch ic
Manufacturer
Fujitsu Microelectronics, Inc.
Datasheet

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FUJITSU SEMICONDUCTOR
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. 100m ) 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
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.
V
In addition, an off-state reverse current prevention function is provided to ensure accurate on/off switching action.
FEATURES
• Low on resistance switch (typ. 100m )
• Low input voltage operation (2.5 V to 5.5 V)
• Switch current (max. 0.6 A)
• UVLO
• ENABLE
• 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
• Either channel may be operated alone.
PACKAGE
DATA SHEET
IN
is divided between the two channels, which operate independently of each other.
:V
:EN threshold
:Power supply current at output off = 0 A
IN
threshold
IN
20-pin plastic SSOP
1.5 V)
(FPT-20P-M03)
EN
2.3V/2.1 V hysteresis 200 mV
EN 1.4V/1.6 V for MB3842, EN 1/2 V
0.8V for MB3842, EN
DS04-27604-2E
V
IN
for MB3845
IN
IN
for MB3845
2.5V)

Related parts for MB3842

MB3842 Summary of contents

Page 1

... The MB3842/3845 is a power management switch with built-in 2-channel low-on resistance (typ. 100m ) 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 operation and stable low-on resistance independent of input voltage ...

Page 2

... MB3842/MB3845 PIN ASSIGNMENT EN1, EN1 SS1 CS1 VIN1 VIN1 VIN2 VIN2 CS2 SS2 EN2, EN2 The functions of pin 1 and pin 10 differ on the MB3842 and MB3845. EN for MB3842/EN for MB3845 SSOP-20P (FPT-20P-M03 Enable EN Enable SS Current Set OC Over Current ...

Page 3

... This is an open drain connection, and should be pulled up to high potential using resistance. 13/14/15 OUT Switching output pin.(N-ch MOSFET source) 16/17/18 MB3842/MB3845 Descriptions , the chip is in STBY state and current consumption is less than IN -0.5V or greater. IN power monitor function) is provided so that when V IN reaches 2 ...

Page 4

... MB3842/MB3845 BLOCK DIAGRAM (for 1 channel) MB3842 Charge pump1 SS1 EN1 OSC1 VIN1 BGR1 Temperature protection 1 MB3845 Charge pump1 SS1 EN1 OSC1 VIN1 BGR1 Temperature protection 1 4 OUT1 CS1 Over current detection 1 COMP Q S FF1 R COMP OUT1 CS1 Over current detection 1 COMP ...

Page 5

... EN — + — Condition — 2 5 — — MB3842/MB3845 Rating Unit Max. Min. –0.3 7.0 V –0.3 7.0 V — 1.8 A — 216 mW –55 +125 C Value Unit Min. Typ. Max. 2.5 5.0 5 — 5.5 V — ...

Page 6

... MB3845 Parameter Symbol I ENH ENABLE pin input current I ENL V ILEN ENABLE pin input voltage V IHEN 6 Condition I =0. 0 0.8V for MB3842 for MB3845 – V IUHY IUH IUL R = 2.0 k LIM R = 6.2 k LIM ...

Page 7

... IN VIN 2 OUT Overcurrent does not occur I OUT OC 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 2 Low Low 5 V ...

Page 8

... MB3842/MB3845 (Continued) • At overcurrent detection VIN OUT I OUT OC • At over-temperature occurrence Over-temperature VIN occurs OUT Overcurrent does not occur I OUT OC 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.) ...

Page 9

... C vs. T (SS) characteristics SS ON 100 10 1 0.1 10 100 MB3842/MB3845 These are the limiting value characteristics for CS pin-to-GND external resistance and output current (OC flag). 10000 LIM There are the characteristics for SS pin-to-GND external capacitance and output ON time. 1000 10000 100000 ...

Page 10

... MB3842/MB3845 (Continued) • SW resistance vs. temperature characteristics 150 140 130 120 110 100 • Temperature-depended SW resistance vs. V 150 140 130 120 110 100 Temperature (V) characteristics voltage ( 0 0 ...

Page 11

... These are the output saturation current characteristics in overcurrent state.(when not controlled by the OC pin warning flag) R not limited (CS GND) LIM Overcurrent flag set (when set for 0.6A) Overcurrent flag set (when set for 0.1A (V) SW MB3842/MB3845 100 Unlimited 6 (Continued) 11 ...

Page 12

... MB3842/MB3845 (Continued) • OC pin flag pull-up resistance (pull-up power 5V) dependant overcurrent operation 500 NS GND 500 NS • Power derating characteristics 1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0 500 500 Temperature 100 k 80 100 ...

Page 13

... C. At the same time the OC output signal goes to “L” level to notify external systems. The latch function can be reset by sending a low signal to the EN input of the MB3842 high signal to the EN input of the MB3845. Slow Start The on/off switching time can be delayed by applying capacitance between the SS and GND pins ...

Page 14

... MB3842/MB3845 TYPICAL APPLICATION MB3842/MB3845 Control signal LIM R LIM C SS Control signal 14 EN1 GND EN1 Pull-up resistance SS1 OC1 OUT1 CS1 OUT1 VIN1 VIN1 OUT1 VIN2 OUT2 VIN2 OUT2 OUT2 CS2 Pull-up resistance SS2 OC2 EN2 GND EN2 Top View Load ...

Page 15

... APPLICATION EXAMPLE (1) Dual-Port Self-Powered Hub Application (NON-GANG Mode Connection) USB 5 V Controller Overcurrent ON/OFF Power Supply 5 V *The MB3842 can also be adapted for use with 3.3V controllers. USB Port 500mA MAX Par Port Smoothing capacitors should be placed between V MB3842/MB3845 MB3842/MB3845 GND EN1,EN1 ...

Page 16

... MB3842/MB3845 (2) Dual-Port Bus Powered Hub Application (GANG Mode Connection) USB Overcurrent ON/OFF 5 V Upstream Port USB Port 100mA MAX Par Port Smoothing capacitors should be placed between V 16 MB3842/MB3845 EN1,EN1 GND OC1 SS1 USB Port1( 4) CS1 OUT1 OUT1 VIN1 400 mA MAX (100 mA 4) ...

Page 17

... For applications in which reverse flow is not acceptable, set V 1 ORDERING INFORMATION Part number MB3842PFV MB3845PFV MB3845PFV-ER pin with the switch off, even when the OUT pin voltage is higher than the IN pin voltage is lower than 1.5 V circuit functions are lost, so that in this IN Package 20-pin Plastic SSOP (FPT-20P-M03) MB3842/MB3845 Remarks 17 ...

Page 18

... MB3842/MB3845 PACKAGE DIMENSION 20-pin plastic SSOP (FPT-20P-M03) * 6.50±0.10(.256±.004) INDEX 0.65±0.12 (.0256±.0047) 5.85(.230)REF 1994 FUJITSU LIMITED F20012S-2C These dimensions do not include resin protrusion. +0.20 1.25 –0.10 +.008 .049 –.004 0.10(.004) * 4.40±0.10 6.40±0.20 5.40(.213) (.173±.004) (.252±.008) NOM " ...

Page 19

... 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 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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