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PDF BD82061FVJ Data sheet ( Hoja de datos )
| Número de pieza | BD82061FVJ | |
| Descripción | (BD82061FVJ / BD82065FVJ) 1ch High Side Switch ICs | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Power Management Switch ICs for PCs and Digital Consumer Products
1ch High Side Switch ICs
for USB Devices and Memory Cards
BD82061FVJ,BD82065FVJ
No.11029EBT21
●Description
Single channel high side switch IC for USB port is a high side switch having over-current protection used in power supply
line of universal serial bus (USB).
N-channel power MOSFET of low on-resistance and low supply current are realized in this IC.
And, over-current detection circuit, thermal shutdown circuit, under-voltage lockout and soft-start circuit are built in.
●Features
1) Low On-Resistance 70mΩ MOSFET Switch
2) Current Limit Threshold 2.4A
3) Control Input Logic
Active “Low” Control Logic : BD82061FVJ
Active “High” Control Logic : BD82065FVJ
4) Soft-Start Circuit
5) Over-Current Protection
6) Thermal Shutdown
7) Under-Voltage Lockout
8) Open-Drain Error Flag Output
9) Reverse Current Protection When Power Switch Off
10) Power Supply Voltage Range 2.7V~5.5V
11) TTL Enable Input
12) 0.8ms Typical Rise Time
13) 1μA Max Standby Current
●Applications
PC, PC peripheral equipment, USB hub in consumer appliances, Car accessory, and so forth
●Line Up Matrix
Parameter
Current limit threshold (A)
Control input logic
Number of channnels
Package
BD82061FVJ
2.4
Low
1ch
TSSOP-B8J
BD82065FVJ
2.4
High
1ch
TSSOP-B8J
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/16
2011.05 - Rev.B
Free Datasheet http://www.datasheet4u.com/
1 page  
BD82061FVJ,BD82065FVJ
●Measurement Circuit
VIN
A
1µF
GND
OUT
IN OUT
IN OUT
VEN(V/EN)
EN(/EN) /OC
Operating current
Technical Note
VIN
A
1µF
GND
OUT
IN OUT
IN OUT
VEN(V/EN)
EN(/EN) /OC
VIN
10kΩ
RL CL
EN, /EN input voltage, Output rise, fall time
Inrush current
VIN
1µF
VEN(V/EN)
GND
OUT
IN OUT
IN OUT
EN(/EN) /OC
VIN
10kΩ
A
CL IOUT
VIN
1µF
VEN(V/EN)
GND
OUT
IN OUT
IN OUT
EN(/EN) /OC
VIN
I/OC
●Timing Diagram
On-resistance
Over-current detection
Fig.1 Measurement circuit
/OC output low voltage
○BD82061FVJ
○BD82065FVJ
VOUT
TON1
90%
TOFF1
90%
VOUT
TON1
90%
TOFF1
90%
10%
TON2
TOFF2
10%
TON2
TOFF2
V/EN
50%
50%
VEN
50%
50%
Fig.2 Timing diagram
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
5/16
2011.05 - Rev.B
Free Datasheet http://www.datasheet4u.com/
5 Page 
BD82061FVJ,BD82065FVJ
Technical Note
●Functional Descriptions
1. Switch operation
IN terminal and OUT terminal are connected to the drain and the source of switch MOSFET respectively. And the IN
terminalis used also as power source input to internal control circuit.
When the switch is turned on from EN, /EN control input, IN terminal and OUT terminal are connected by a 70mΩ switch.
In on status, the switch is bidirectional. Therefore, when the potential of OUT terminal is higher than that of IN terminal,
current flows from OUT terminal to IN terminal.
Since a parasitic diode between the drain and the source of switch MOSFET is canceled, in the off status, it is possible to
prevent current from flowing reversely from OUT to IN.
2. Thermal shutdown circuit (TSD)
If over-current would continue, the temperature of the IC would increase drastically. If the junction temperature were
beyond 170℃ (typ.) in the condition of over-current detection, thermal shutdown circuit operates and makes power
switch turn off and outputs error flag (/OC). Then, when the junction temperature decreases lower than 150℃ (typ.),
power switch is turned on and error flag (/OC) is cancelled. Unless the fact of the increasing chips temperature is
removed or the output of power switch is turned off, this operation repeats.
The thermal shutdown circuit operates when the switch is on (EN,/EN signal is active).
3. Over-current detection (OCD)
The over-current detection circuit limits current (ISC) and outputs error flag (/OC) when current flowing in each switch
MOSFET exceeds a specified value. There are three types of response against over-current. The over-current detection
circuit works when the switch is on (EN,/EN signal is active).
3-1. When the switch is turned on while the output is in shortcircuit status
When the switch is turned on while the output is in shortcircuit status or so, the switch gets in current limit status
soon.
3-2. When the output shortcircuits while the switch is on
When the output shortcircuits or large capacity is connected while the switch is on, very large current flows until the
over-current limit circuit reacts. When the current detection, limit circuit works, current limitation is carried out.
3-3. When the output current increases gradually
When the output current increases gradually, current limitation does not work until the output current exceeds the
over-current detection value. When it exceeds the detection value, current limitation is carried out.
4. Under-voltage lockout (UVLO)
UVLO circuit prevents the switch from turning on until the VIN exceeds 2.3V(Typ.). If the VIN drops below 2.2V(Typ.) while
the switch turns on, then UVLO shuts off the power switch. UVLO has hysteresis of a 100mV(Typ.).
Under-voltage lockout circuit works when the switch is on (EN,/EN signal is active).
5. Error flag (/OC) output
Error flag output is N-MOS open drain output. At detection of over-current, thermal shutdown, low level is output.
Over-current detection has delay filter. This delay filter prevents instantaneous current detection such as inrush current at
switch on, hot plug from being informed to outside.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
11/16
2011.05 - Rev.B
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
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