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BD8627EFV-E2

P1-P3P4-P6P7-P9P10-P12P13-P13
Technical Note
10/12
BD8627EFV
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
● Protection function
Protection circuit is effective for destruction prevention due to accident so that avoid using under continuous protection
operation.
Low voltage protection function (LVP)
The voltage of the terminal FB (2 pins) is compared with internal reference voltage VREF.
If FB terminal voltage falls below V
LVP
(= VREF -60mV) and the state continues for 500us, output changes to low voltage and
the state is fixed. In that case , PDET (3pin) output changes to L.
Table 1 output low voltage protection function
EN terminal SS terminal FB terminal
Low voltage protection
function
Low voltage protection
operation
>V
IHEN
>1.4V(typ)
<V
LVP
Effective
ON
>V
LVP
OFF
<1.4V(typ) - Invalidity OFF
<V
ILEN
- - Invalidity OFF
＊ Low voltage protection function is available when SS terminal voltage becomes more than
1.4V (typ) in the transition to ON control (during soft start).
Over voltage protection function(OVP)
The voltage of the terminal FB is compared with internal reference voltage VREF.
If FB terminal voltage is over Vovp (=VREF +60mV) and the state is continues for 500usec, output changes to low voltage
and the state is fixed.
Table 2 output over voltage protection function
EN terminal SS terminal FB terminal
Over voltage
protection function
Over voltage
protection operation
>V
IHEN
>1.4V(typ)
>V
OVP
Effective
ON
<V
OVP
OFF
<1.4V(typ) - Invalidity OFF
<V
ILEN
- - Invalidity OFF
＊ Over voltage protection function is available when SS terminal voltage becomes more than
1.4V (typ) in the transition to ON control (during soft start).
FB terminal voltage
VREF
0
ON
OFF
Protection
OVP LVP
VREF＋60ｍV
V
FB
PDET terminal
HIGH
LOW
VREF-60ｍV
500[us] 500[us]
Fig. 5 Output voltage error detection range
Technical Note
11/12
BD8627EFV
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Under voltage lock out protection (UVLO)
As for BD8627EFV, the power-supply voltage decrease detection protection circuit is built in.
It the input voltage decrease below the UVLO voltage (4.0V typ), the device state changes to the standby mode (Moreover,
to prevent the chattering of the output) hysteresis width of 300mV(typ) has been installed in the UVLO cancel voltage.
RT terminal open/short protection function (RTO/RTS)
RT terminal opening/short protection function prevent the clock from abnormal oscillation.
If RT terminal open/short protection function is detected, output voltage changes to low level and is fixed.
Terminal RT opening/short protection function is always effective after the power supply start-up.
Terminal RT opening/short protection function is available if the state continue for 500usec, abnormal detection operates
when the state continues about 500μsec(typ).
Soft start time-out function
If VSS doesn't exceed VSSTH within 64msec (typ) since a soft start began, BD8627EFV controls an off latch.
Vo is fixed in a low level.
Fig. 6 Soft start time-out
Error detection (off latch) release method
BD8627EFV enters the state of an off latch when the protection function operates.
To release the off latch state, EN terminal voltage should be changed to low level once time.
Thermal shut down function
Thermal shut down circuit (TSD circuit) is built into BD8627EFV. When the temperature of the chip exceeds Tjmax=175, the
DC/DC converter is fixed in a low voltage.
TSD function is aimed to shut down IC from thermal reckless driving under an abnormal state to exceed Tjmax=175.
It aims at neither protection nor the guarantee of the set. Therefore, please do not use this function to protect the set.
Over current protection function
The over current protection function has been achieved by limiting the current that flows on high side MOSFET.
The current is controlled in every one cycle of the switching frequency. When an abnormal state continues for about
500μsec(typ), the output is fixed in a low level.
Technical Note
12/12
BD8627EFV
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
●Ordering part number
B D 8 6 2 7 E F V - E 2
Part No Part No.
Package
EFV: HTSSOP-B24
Packaging and forming specification
E2: Embossed tape and reel
<Tape and Reel information>
Ta
p
e
Quantit
y
Direction
of feed
Embossed carrier ta
p
e
2500
p
cs
E2
(The direction is the 1pin of product is at the upper left when you hold
reel on the left hand and you pull out the tape on the right hand)
Unit:mm
)
HTSSOP-B20
<Dimension>
1.0Max.
101
20 11
0.17
1.0
±
0.2
0.5
±
0.15
0.65
S
0.08
+0.05
−0.04
+0.05
−0.03
0.2
6.4
±
0.2
0.85
±
0.05
0.08
±
0.05
4.4
±
0.1
0.325
6.5
±
0.1
S
Reel
1pin
1234
1234
1234
1234
1234
1234
1234
1234
※When you order , please order in times the amount of package quantity.
Direction of feed
P1-P3P4-P6P7-P9P10-P12P13-P13

BD8627EFV-E2

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Switching Voltage Regulators POWER SUPPLY IC
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