Rohm BD4154FV Power switch ic for expresscardtm Datasheet

Power Management Switch IC Series for PCs and Digital Consumer Product
Power Switch IC
for ExpressCardTM
BD4154FV
No.09029EAT09
●Description
TM
BD4154FV is a power management switch IC for the next generation PC card (ExpressCard ) developed by the PCMCIA.
TM
TM
It conforms to the PCMCIA ExpressCard Standard, ExpressCard Compliance Checklist, and ExpressCardTM Implementation
Guideline, and obtains the Compliance ID “EC100040” from PCMCIA. The power switch offers a number of functions - card
detector, and system status detector - which are ideally suited for laptop and desktop computers.
●Features
TM
1) Incorporates three low on-resistance FETs for ExpressCard .
2) Incorporates an FET for output discharge.
3) Incorporates an enabler.
4) Incorporates under voltage lockout (UVLO) protection.
5) Employs an SSOP-B20 package.
6) Built-in thermal shutdown protector (TSD).
7) Built-in soft start function.
8) Incorporates an overcurrent protection (OCP).
9) Built-in enable signal for PLL
TM
10) Built-in Pull up resistance for detecting ExpressCard
TM
11) Conforms to the ExpressCard Standard.
12) Conforms to the ExpressCardTM Compliance Checklist.
13) Conforms to the ExpressCardTM Implementation Guideline.
●Applications
TM
Laptop and desktop computers, and other ExpressCard equipped digital devices.
●Product Lineup
Parameter
BD4154FV
Package
SSOP-B20
“ExpressCardTM” is a registered trademark registered of the PCMCIA (Personal Computer Memory Card International Association).
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© 2009 ROHM Co., Ltd. All rights reserved.
1/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Absolute Maximum Ratings
Parameter
Input Voltage
Logic Input Voltage 1
Logic Output Voltage 1
Logic Output Voltage 2
Output Voltage
Symbol
Limit
V3AUX_IN, V3_IN, V15_IN
EN,CPPE#,CPUSB#,SYSR,
PERST_IN#,RCLKEN
RCLKEN
Unit
-0.3～5.0
*1
V
*1
V
-0.3～V3AUX_IN+0.3 *1
V
PERST#
-0.3～V3AUX_IN+0.3
V
V3AUX,V3, V15
-0.3～5.0 *1
V
-0.3～V3AUX_IN+0.3
Output Current 1
IOV3AUX
1.0
A
Output Current 2
IOV3
2.0
A
Output Current 3
IOV15
2.0
A
*2
mW
Power Dissipation 1
Pd1
500.0
Power Dissipation 2
Pd2
812.5 *3
mW
Operating Temperature Range
Topr
-40～+100
℃
Storage Temperature Range
Tstg
-55～+150
℃
Tjmax
+150
℃
Maximum Junction Temperature
*1 Not to exceed Pd.
*2 Reduced by 4.0mW for each increase in Ta of 1℃ over 25℃
*3 Reduced by 6.5mW for each increase in Ta of 1℃ over 25℃(When mounted on a board 70mmx70mmx1.6mm Glass-epoxy PCB)
●Operating Conditions (Ta=25℃)
Parameter
Symbol
MIN
MAX
Unit
Input Voltage 1
V3AUX_IN
3.0
3.6
V
Input Voltage 2
V3_IN
3.0
3.6
V
Input Voltage 3
V15_IN
1.35
1.65
V
Logic Input Voltage 1
EN
-0.3
3.6
V
Logic Input Voltage 2
CPPE#,CPUSB#,SYSR,
PERST_IN#,RCLKEN
0
V3AUX_IN
V
Logic Output Voltage 1
RCLKEN
0
V3AUX_IN
V
Logic Output Voltage 2
PERST#
0
V3AUX_IN
V
Output Current 1
IOV3AUX
0
275
mA
Output Current 2
IOV3
0
1.3
A
Output Current 3
IOV15
0
650
mA
* This product is not designed to offer protection against radioactive rays.
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© 2009 ROHM Co., Ltd. All rights reserved.
2/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Electrical Characteristics (unless otherwise noted, Ta=25℃ VEN=3.3V V3AUX_IN =V3_IN=3.3V,V15_IN=1.5V)
Standard Value
Parameter
Symbol
Unit
Condition
MIN
TYP
MAX
µA
Standby Current
IST
40
80
VEN=0V (Include IEN, IRCLKEN)
µA
Bias Current 1
Icc1
120
250
VSYSR=0V
µA
Bias Current 2
Icc2
250
500
VSYSR=3.3V
[Enable]
High Level Enable Input Voltage
VENHI
2.0
5.5
V
V
Low Level Enable Input Voltage
VENLOW
-0.2
0.8
µA
Enable Pin Input Current
IEN
10
30
VEN=0V
[Logic]
V
High Level Logic Input Voltage
VLHI
2.0
V
Low Level Logic Input Voltage
VLLOW
0.8
µA
0
1
CPPE#=3.6V
ICPPE#
µA
10
30
CPPE#=0V
µA
0
1
CPUSB#=3.6V
ICPUSB#
µA
10
30
CPUSB#=0V
µA
0
1
SYSR=3.6V
Logic Pin Input Current
ISYSR
µA
10
30
SYSR=0V
µA
0
1
PERST_IN#=3.6V
IPRT_IN#
µA
10
30
PERST_IN#=0V
µA
0
1
RCLKEN=3.6V
IRCLKEN
µA
10
30
RCLKEN=0V
RCLKEN Low Voltage
VRCLKEN
0.1
0.3
V
IRCLKEN=0.5mA
RCLKEN Leak Current
IRCLKEN
1
µA
VRCLKEN=3.65V
[Switch V3AUX]
On Resistance
RV3AUX
120
220
mΩ Tj=-10～100℃ *
Discharge On Resistance
RV3AUX Dis
60
150
Ω
[Switch V3]
On Resistance
RV3
42
90
mΩ Tj=-10～100℃ *
Discharge On Resistance
RV3Dis
60
150
Ω
[Switch V15]
On Resistance
RV15
45
90
mΩ Tj=-10～100℃ *
Discharge On Resistance
RV15Dis
60
150
Ω
[Over Current Protection]
V3 Over Current
OCPV3
1.3
A
V3AUX Over Current
OCPV3AUX
0.275
A
V15 Over Current
OCPV15
0.65
A
[Under Voltage Lockout]
V3_IN UVLO OFF Voltage
VUVLOV3_IN
2.70
2.80
2.90
V
sweep up
V3_IN Hysteresis Voltage
⊿VUVLOV3_IN
50
100
150
mV sweep down
V3AUX_IN UVLO OFF Voltage
VUVLOV3AUX_IN
2.70
2.80
2.90
V
sweep up
V3AUX_IN Hysteresis Voltage
⊿VUVLOV3AUX_IN
50
100
150
mV sweep down
V15_IN UVLO OFF Voltage
VUVLOV15_IN
1.15
1.20
1.25
V
sweep up
V15_IN Hysteresis Voltage
⊿VUVLOV15_IN
50
100
150
mV sweep down
[POWER GOOD]
V3 POWER GOOD Voltage
PGV3
2.700 2.850 3.000
V
V3AUX POWER GOOD
2.700 2.850 3.000
V
PGV3AUX
Voltage
V15 POWER GOOD Voltage
PGV15
1.200 1.275 1.350
V
PERST# LOW Voltage
VPERST#Low
0.1
0.3
V
IPERST=0.5mA
PERST# HIGH Voltage
VPERST#HIGH
3.0
V
PERST# Delay Time
TPERST#
4
20
ms
PERST# assertion time
Tast
500
ns
[OUTPUT RISE TIME]
V3_IN to V3
TV3
0.1
3
ms
V3AUX_IN to V3AUX
TV3AUX
0.1
3
ms
V15_IN to V15
TV15
0.1
3
ms
* Design target
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© 2009 ROHM Co., Ltd. All rights reserved.
3/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Reference data
CPPE#(2V/div)
CPPE#(2V/div)
SYSR(2V/div)
V3(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
RV3=3.3Ω
RV3AUX=13.2Ω
RV15=3Ω
V15(1V/div)
V15(1V/div)
5.0ms/div
V15(1V/div)
5.0ms/div
Fig.1 Card Assert/ De-assert
(Active)
Fig.2 Card Assert/De-assert
(Standby)
SYSR(2V/div)
5.0ms/div
Fig.3 System Active⇔Standby
( Card Present)
CPUSB#(2V/div)
CPPE#(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
V15(1V/div)
V15(1V/div)
V15(1V/div)
5.0ms/div
500μs/div
Fig.4 System Active⇔Standby
(No Card)
Fig.5
Wakeup Wave Form
(Card Assert)
EN(2V/div)
V3(2V/div)
V3AUX(2V/div)
CPPE#(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V15(1V/div)
V15(1V/div)
500μs/div
500μs/div
Fig.8
Wakeup Wave Form
(Standby→Active)
CPUSB#(2V/div)
Wakeup Wave Form
(USB2.0 Assert)
SYSR(2V/div)
V3AUX(2V/div)
V15(1V/div)
Fig.7 Wakeup Wave Form
(Shut Down→Active)
500μs/div
Fig.6
500µs/div
Fig.9
Power Down Wave Form
(Card De-assert)
EN(2V/div)
SYSR(2V/div)
V3(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
V15(1V/div)
V15(1V/div)
V3AUX(2V/div)
500µs/div
Fig.10 Power Down Wave Form
(USB2.0 De-assert)
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© 2009 ROHM Co., Ltd. All rights reserved.
Fig.11
500µs/div
Power Down Wave Form
(Active→Shut Down)
4/15
V15(1V/div)
Fig.12
5.0ms/div
Power Down Wave Form
(Active→Standby)
2009.05 - Rev.A
Technical Note
BD4154FV
CPPE#(2V/div)
CPPE#(2V/div)
CPPE#(2V/div)
V3(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
RCLKEN(2V/div)
PERST#(2V/div)
PERST#(2V/div)
5.0ms/div
5.0ms/div
Fig.13 PERST# Wave Form
(Card Assert/ De-assert)
CPUSB#(2V/div)
5.0ms/div
Fig.14 RCLKEN Wave Form
(Card Assert/ De-assert)
PERST_IN#(2V/div)
PERST_IN#(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
RCLKEN(2V/div)
V3(2V/div)
RCLKEN Wave Form
(USB2.0 Assert/ De-assert)
V3_IN(2V/div)
1.0ms/div
Fig.17 PERST# Wave Form
(PERST_IN# Input)
V3AUX_IN(2V/di
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V15(1V/div)
500μs/div
Fig.19 Output Voltage
(V3_IN:OFF→ON)
V3_IN(2V/div)
V3(2V/div)
V3AUX(2V/div)
V15(1V/div)
V15(1V/div)
500μs/div
Fig.22 Output Voltage
(V3_IN:ON→OFF)
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© 2009 ROHM Co., Ltd. All rights reserved.
1.0ms/div
Fig.18 RCLKEN Wave Form
(PERST_IN# Input)
V15_IN(2V/div)
V3(2V/div)
V3AUX(2V/div)
V15(1V/div)
500μs/div
500μs/div
Fig.20 Output Voltage
(V3AUX_IN:OFF→ON)
V3AUX_IN(2V/di
Fig.21 Output Voltage
(V15_IN:OFF→ON)
V15_IN(2V/div)
V3(2V/div)
V3(2V/div)
V3AUX(2V/div)
V3AUX(2V/div)
RV3=3.3Ω
RV3AUX=13.2Ω
RV15=3Ω
V3AUX(2V/div)
RCLKEN(2V/div)
PERST#(2V/div)
5.0ms/div
Fig.16
Fig.15 PERST# Wave Form
(USB2.0 Assert/ De-assert)
V3AUX(2V/div)
V15(1V/div)
RV3=3.3Ω
RV3AUX=13.2Ω
RV15=3Ω
500μs/div
Fig.23 Output Voltage
(V3AUX_IN:ON→OFF)
5/15
RV3=3.3Ω
RV3AUX=13.2Ω
V15(1V/div) RV15=3Ω
500μs/div
Fig.24 Output Voltage
(V15_IN:ON→OFF)
2009.05 - Rev.A
Technical Note
BD4154FV
●Block Diagram
V3-1
V3_IN1
4
VD
5
3.3V
3.3V/1.30A
6
7
V3_IN2
V3-2
TSD,CL,UVLO
3.3V AUX/275mA
V3AUX_IN
18
17
VD
V3AUX
3.3V
TSD,CL,UVLO_AUX
V15_IN1
1.5V
V15_IN2
V15-1 1.5V/625mA
15
14
16
CPPE#
CPUSB#
SYSR
V3AUX_IN
VD
12
Input
11
logic
19 RCLKEN
Power
good
TSD,CL,UVLO
3
8 PERST#
EN,SYSR,CPUSB#,CPPE#
V3AUX_IN
Thermal
protection
TSD
1 PERST_IN#
V3_IN,V3AUX_IN,V15_IN
CL
V3,V3AUX,V15
EN
2
V15-2
Reference
Block
V3_IN
V3AUX_IN
Charge
Pump
VD
V15_IN
Under
voltage
lock out
UVLO
UVLO_AUX
10
GND
●PIN CONFIGRATION
PERST_IN# 1
20 NC
EN 2
SYSR
●PIN FUNCTION
19 RCLKEN
3
18 V3AUX_IN
V3_IN1 4
17 V3AUX
V3_IN2 5
16 V15_IN2
V3_1 6
15 V15_IN1
V3_2 7
14 V15_2
PERST# 8
13 V15_1
TEST 9
12 CPPE#
GND 10
11 CPUSB#
SSOP-B20 Package
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© 2009 ROHM Co., Ltd. All rights reserved.
PIN No
PIN NAME
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
PERST_IN#
EN
SYSR
V3_IN1
V3_IN2
V3_1
V3_2
PERST#
TEST
GND
CPUSB#
CPPE#
V15_1
V15_2
V15_IN1
V15_IN2
V3AUX
V3AUX_IN
19
RCLKEN
20
NC
6/15
PIN FUNCTION
PERST# control input pin (SysReset#)
Enable input pin
Logic input pin
V3 input pin 1
V3 input pin 2
V3 output pin 1
V3 output pin 2
Logic output pin
Test pin
GND pin
Logic input pin
Logic input pin
V15 output pin 1
V15 output pin 2
V15 input pin 1
V15 input pin 2
V3AUX output pin
V3AUX input pin 1
Reference clock enable signal/
Power good signal (No delay)
Non connection
2009.05 - Rev.A
Technical Note
BD4154FV
●Description of block operation
EN
With an input of 2.0 volts or higher, this terminal goes HIGH to activate the circuit, and goes LOW to deactivate the circuit
(with the standby circuit current of 40 μA), It discharges each output and lowers output voltage when the input falls to 0.8
volts or less.
V3_IN, V15_IN, and V3AUX_IN
These are the input terminals for each channel of a 3ch switch. V3_IN and V15_IN terminals have two pins each, which
should be short-circuited on the pc board with a thick conductor. A large current runs through these three terminals :
(V3_IN: 1.35A; V3AUX_IN: 0.275 A; and V15_IN: 0.625 A). In order to lower the output impedance of the connected power
supply, it is recommended that ceramic capacitors (with B-type characteristics or better) be provided between these
terminals and the ground. Specifically, the capacitors should be on the order of 1 μF between V3_IN and GND, and between
V15_IN and GND; and on the order of 0.1 μF between V3AUX_IN and GND.
V3, V15, and V3AUX
These are the output terminals for each switch. The V3 and V15 terminals have two pins each, which should be
short-circuited on the PC board and connected to an ExpressCard connector with a thick conductor, as short as possible.
In order to stabilize the output, it is recommended that ceramic capacitors (with B-type characteristics or better) be provided
between these terminals and the ground. Specifically, the capacitors should be on the order of 10 μF between V3 and GND,
and between V15 and GND; and on the order of 1 μF between V3AUX and GND.
CPPE#
This pin is used to find whether or not a PCI-Express signal compatible card is present. Turns to “High” level with an input
of 2.0 volts or higher, which means that no card is provided, while it turns to “Low” level when the input is lowered to 0.8 volts
or less, which means that a card is provided. Controls the ON/OFF, switch selecting the proper mode based on the status
of the system.
Pull up resistance (100kΩ～200kΩ) is built into, so the number of components is reduced.
CPUSB#
This pin is used to find whether or not a USB2.0 signal compatible card is present. Turns to “High” level with an input of 2.0
volts or higher, which means that no card is provided, while it turns to “Low” level when the input is lowered to 0.8 volts or
less, which means that a card is provided. Controls the ON/OFF switch, selecting the proper mode based on the system
status.
Pull up resistance (100kΩ～200kΩ) is built into, so the number of components is reduced.
SYSR
This pin is used to detect the system status. Turns to “High” level with an input of 2.0 volts or higher, which means that the
system is activated, while it turns to “Low” level when the input is lowered to 0.8 volts or less, which means that the system is
on standby.
PERST_IN#
This pin is used to control the reset signal (PERST#) to a card from the system side. (Also referred to as “SysReset#” by
PCMCIA.) Turns to “High” level with an input of 2.0 volts or higher, and sets PERST# to “High” AND with a “Power Good”
output. Turns to “Low” level and sets PERST# to “Low” when the input falls to 0.8 volts or less.
PERST#
This pin is used to send a reset signal to a PCI-Express compatible card. Reset status is determined by the outputs,
PERST_IN#, CPPE# system status, and EN on/off status. Turns to “High” level and activates the PCI-Express compatible
card only if each output is within the “Power Good” threshold, with the card inserted and PERST_IN# turned to “High” level.
RCLKEN
This pin is used to send an enable signal to the reference clock. Activation status is determined by the outputs, CPPE#
system status, and EN on/off status. Turns to “High” level and activates the reference clock PLL only if each output is within
the “Power Good” threshold, with the card kept inserted.
TEST
This pin is used to test, which should be short-circuited to the GND. When it is short-circuited to V3AUX_IN, UVLO (V3_IN,
V15_IN) turns OFF.
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7/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Timing Chart
Power ON/OFF Status of ExpressCardTM
System Status
Primary
Auxiliary
OFF
OFF
ON
ON
ON
ON
ExpressCardTM Module Status
Power Switch Status
Primary(+3.3V and +1.5V)
Auxiliary(3.3V Aux)
Don’t care
OFF
OFF
De-asserted
OFF
OFF
Asserted
ON
ON
De-asserted
Asserted Before This
Asserted After This
OFF
OFF
OFF
OFF
ON
OFF
TM
ExpressCard
States Transition Diagram
SYSR=L
CP#=L→H
SYSR=H⇔L
CP#=H
SYSR=H
CP#=H→L
SYSR=L
CP#=H⇔L
V3AUX=OFF
V15=V3=OFF
SYSR=L→H
CP#=L
V3AUX=ON
V15=V3=ON
SYSR=H→L
CP#=L
SYSR=H
CP#=L→H
SYSR=L→H
CP#=L
V3AUX=ON
V15=V3=OFF
SYSR=H→L
CP#=L
SYSR=L
⇔
CP#=L
SYSR=H
CP#=H
System Status
Card Status
Stand-by Status
:SYSR=L
ON Status
:SYSR=H
Card De-asserted Status
:CP#=H
From ON to Stand-by Status
:SYSR=H→L
From De-asserted to Asserted Status
:CP#=H→L
From Stand-by to ON Status
:SYSR=L→H
From Asserted to De-asserted Status
:CP#=L→H
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© 2009 ROHM Co., Ltd. All rights reserved.
Card Asserted Status
8/15
:CP#=L
2009.05 - Rev.A
Technical Note
BD4154FV
■ BD4154FV Evaluation Board
U1
SW1
R1
GND SW2
1
PERST_IN#
GND SW3
R2
C1
GND
R3
C2
GND
EN
GND
SYSR
C4
GND
20
SW4
2
EN
RCLKEN
19
RCLKEN
V3AUX_IN(S)
3
C3 V3_IN(S)
GND
4
V3_IN
BD4154FV
PERST_IN#
5
SYSR
V3AUX_IN1
V3_IN1
V3AUX
V3_IN2
V15_IN2
18
V3AUX_IN
V3AUX(S)
C18
GND
V15_IN(S)
16
C17
GND
15
C15
GND
17
V3(S)
6
V3
V3_1
V15_IN1
V3_2
V15_2
GND
V3AUX_IN
V3AUX
V15_IN
C6
7
GND
8
PERST #
V3AUX_IN
SW7
9
10
GND
PERST#
V15_1
TEST
CPPE#
GND
CPUSB#
SSOP-B20
14
V15(S)
V15
C13
GND
13
SW5
R12
12
11
C12
GND
CPPE#
SW6
GND
R11
CPUSB#
C11
GND
GND
■ BD4154FV Evaluation Board Application Components
Part No
Value
Company
Part Name
R1
0Ω
ROHM
MCR03series
R2
0Ω
ROHM
MCR03series
R3
0Ω
ROHM
MCR03series
R11
0Ω
ROHM
MCR03series
R12
0Ω
ROHM
MCR03series
C1
-
-
-
C2
-
-
-
C3
-
-
-
C4
1μF
ROHM
MCH213CN 105K
C6
10μF
ROHM
MCH218CN 106K
C11
-
-
-
C12
-
-
-
C13
10μF
ROHM
MCH218CN 106K
C15
1μF
ROHM
MCH213CN 105K
C17
1μF
ROHM
MCH213CN 105K
C18
0.1μF
ROHM
MCH182CN 104K
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© 2009 ROHM Co., Ltd. All rights reserved.
9/15
2009.05 - Rev.A
Technical Note
BD4154FV
■ BD4154FV Evaluation Board Layout
Silk Screen
TOP Layer
Mid Layer 1
Mid Layer 2
Bottom Layer
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10/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Application Circuit (Circuit for ExpressCardTM Compliance Checklist)
CPPE#(1)
CPUSB#(2)
3.3V(3)
CPPE#(12pin)
RCLKEN(19pin)
CPUSB#(11pin)
V3_IN(4,5pin)
V3(6,7pin)
3.3V(7)
V3AUX_IN(18pin)
3.3Vaux(8)
BD4154FV
3.3Vaux(4)
V3AUX(17pin)
V15_IN(15,16pin)
1.5V(9)
1.5V(5)
V15(13,14pin)
PERST_IN#(1pin)
SysReset#(10)
PERST#(6)
PERST#(8pin)
EN(2pin)
SYSR(3pin)
GND(10pin)
●Heat loss
Thermal design should allow the device to operate within the following conditions. Note that the temperatures listed are the
allowed temperature limits. Thermal design should allow sufficient margin from these limits.
1. Ambient temperature Ta can be no higher than 100°C.
2. Chip junction temperature Tj can be no higher more than 150°C.
Chip junction temperature Tj can be determined as follows:
①Chip junction temperature Tj is calculated from IC surface temperature TC under actual application conditions:
Tj=TC+θj-cxW
＜Reference value＞
θj-c:SSOP-B20
35 /W
②Chip junction temperature Tj is calculated from ambient temperature Ta:
Tj=TC+θj-axW
＜Reference value＞
θj-a:SSOP-B20
250℃/W (IC only)
153.8℃/W Single-layer substrate
(substrate surface copper foil area: less than 3%)
Most of heat loss in the BD4154FV occurs at the output switch. The power lost is determined by multiplying the
on-resistance by the square of output current of each switch.
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11/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Equivalent Circuit
1pin<PERST_IN#>
V3AUX_IN
2pin<EN>
V3AUX_IN
4,5pin<V3_IN1,V3_IN2>
3pin<SYSR>
V3AUX_IN
V3AUX_IN
6,7pin<V3_1,V3_2>
V3AUX_IN
V3AUX_IN
8pin<PERST#>
V3_IN
V3AUX_IN
V3
9pin<TEST>
11pin<CPUSB#>
12pin<CPPE#>
V3AUX_IN
13,14pin<V15_1,V15_2>
V3AUX_IN
15,16pin<V15_IN1,V15_IN2>
V3_IN
V3AUX_IN
V3AUX_IN
17pin<V3AUX>
V3AUX_IN
V15
18pin<V3AUX_IN>
19pin<RCLKEN >
V3AUX_IN
V3AUX
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12/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Notes for Use
1.Absolute maximum ratings
Although quality is rigorously controlled, the device may be destroyed when applied voltage, operating temperature, etc.
exceeds its absolute maximum rating. Because the source (short mode or open mode) cannot be identified once the IC
is destroyed, it is important to take physical safety measures such as fusing when implementing any special mode that
operates in excess of absolute rating limits.
2.Thermal design
Consider allowable loss (Pd) under actual operating conditions and provide sufficient margin in the thermal design.
3.Terminal-to-terminal short-circuit and mis-mounting
When the mounting the IC to a printed circuit board, take utmost care to assure the position and orientation of the IC are correct.
In the event that the IC is mounted erroneously, it may be destroyed. The IC may also be destroyed when a short-circuit is
caused by foreign matter introduced into the clearance between outputs, or between an output and power-GND.
4.Operation in strong electromagnetic fields
Using the IC in strong electromagnetic fields may cause malfunctions. Exercise caution in respect to electromagnetic fields.
5.Built-in thermal shutdown protection circuit
This IC incorporates a thermal shutdown protection circuit (TSD circuit). The working temperature is 175°C (standard value)
with a -15°C (standard value) hysteresis width. When the IC chip temperature rises the TSD circuit is activated, while the
output terminal is brought to the OFF state. The built-in TSD circuit is intended exclusively to shut down the IC in a thermal
runaway event, and is not intended to protect the IC or guarantee performance in these conditions. Therefore, do not
operate the IC after with the expectation of continued use or subsequent operation once this circuit is activated.
6.Capacitor across output and GND
When a large capacitor is connected across the output and GND, and the V3AUX_IN is short-circuited with 0V or GND for
any reason, current charged in the capacitor flows into the output and may destroy the IC. Therefore, use a capacitor
smaller than 1000 μF between the output and GND.
7.Set substrate inspection
Connecting a low-impedance capacitor to a pin when running an inspection with a set substrate may produce stress on the IC.
Therefore, be certain to discharge electricity at each process of the operation. To prevent electrostatic accumulation and
discharge in the assembly process, thoroughly ground yourself and any equipment that could sustain ESD damage, and
continue observing ESD-prevention procedures in all handling, transfer and storage operations. Before attempting to
connect the set substrate to the test setup, make certain that the power supply is OFF. Likewise, be sure the power supply
is OFF before removing the substrate from the test setup.
8.IC terminal input
+
This integrated circuit is a monolithic IC, with P substrate and P isolation between elements.
The P layer and N layer of each element form a, PN junction. When the potential relation is GND>terminal A>terminal B,
the PN junction works as a diode, and when terminal B>GND terminal A, the PN junction operates as a parasitic transistor.
Parasitic elements inevitably form, due to the nature of the IC construction. The operation of the parasitic element gives
rise to mutual interference between circuits and results in malfunction, and eventually, breakdown. Consequently, take
utmost care not to use the IC in a way that would cause the parasitic element to actively operate, such as applying voltage
lower than GND (P substrate) to the input terminal.
Resistor
NPN Transistor Structure (NPN)
（PIN A）
（PIN B）
E
C
Parasitic diode
GND
N
P+
P+
P
P
P+
N
GND
（PIN B）
P+
N
N
N
P substrate
（PIN A）
B
N
Parasitic diode
GND
C
N
B
E
P substrate
Parasitic diode
GND
GND
Nearby other device
Parasitic diode
9. GND wiring pattern
If both a small signal GND and a high current GND are present, it is recommended that the patterns for the high current
GND and the small signal GND be separated. Proper grounding to the reference point of the set should also be provided.
In this way, the small signal GND voltage will by unaffected by the change in voltage stemming from the pattern wiring
resistance and the high current. Also, pay special attention to avoid undesirable wiring pattern fluctuations in any
externally connected GND component.
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13/15
2009.05 - Rev.A
Technical Note
BD4154FV
10. Electrical characteristics
The electrical characteristics in the Specifications may vary, depending on ambient temperature, power supply voltage,
circuit(s) externally applied, and/or other conditions. Therefore, please check all such factors, including transient
characteristics, that could affect the electrical characteristics.
11. Capacitors applied to input terminals
The capacitors applied to the input terminals (V3_IN, V3AUX_IN and V15_IN) are used to lower the output impedance of
the connected power supply. An increase in the output impedance of the power supply may result in destabilization of
input voltages (V3_IN, V3AUX_IN and V15_IN). It is recommended that a low-ESR capacitor be used, with a lower
temperature coefficient (change in capacitance vs. change in temperature), Recommended capacitors are on the order of
0.1 μF for V3AUX_IN, and1 μF for V3_IN and V15_IN. However, they must be thoroughly checked at the temperature
and with the load range expected in actual use, because capacitor selection depends to a significant degree on the
characteristics of the input power supply to be used and the conductor pattern of the PC board.
12. Capacitors applied to output terminals
Capacitors for the output terminals (V3, V3_AUX, and V15), should be connected between each of the output terminals
and GND. A low-ESR, low temperature coefficient output capacitor is recommended-on the order of 1 μF for V3 and V15
terminals, and 1μF less for V3_AUX. However, they must be thoroughly checked at the temperature and with the load
range expected in actual use, because capacitor selection depends to a significant degree on the temperature and the
load conditions.
13. Not of a radiation-resistant design.
14. Allowable loss (Pd)
With respect to the allowable loss, please refer to the thermal derating characteristics shown in the Exhibit, which serves
as a rule of thumb. When the system design causes the IC to operate in excess of the allowable loss, chip temperature
will rise, reducing the current capacity and decreasing other basic IC functionality. Therefore, design should always
enable IC operation within the allowable loss only.
15. Operating range
Basic circuit functions and operations are warranted within the specified operating range the working ambient temperature
range. Although reference values for electrical characteristics are not warranted, no rapid or extraordinary changes in
these characteristics are expected, provided operation is within the normal operating and temperature range.
16. The applied circuit example diagrams presented here are recommended configurations. However, actual design
depends on IC characteristics, which should be confirmed before operation. Also, note that modifying external circuits
may impact static, noise and other IC characteristics, including transient characteristics. Be sure to allow sufficient
margin in the design to accommodate these factors.
17. Wiring to the input terminals (V3 IN, V3AUX IN, and V15 IN) and output terminals (V3, V3AUX and V15) of the built-in FET
should be carried out with special care. Using unnecessarily long and/or thin conductors may decrease output voltage
and degrade other characteristics.
18. Heatsink
The heatsink is connected to the SUB, which should be short-circuited to the GND. Proper heatsink soldering to the PC
board should enable lower thermal resistance.
●Power Dissipation
Mounted on board
70mmx70mmx1.6mm glass-epoxy PCB
θj-a=153.8℃/W
[mW]
1000
812.5mW
Power Dissipation (Pd)
800
Without heat sink
θj-a=250.0℃/W
500mW
600
100℃
400
200
0
0
25
50
75
100
125
150
[℃]
Ambient Temperature (Ta)
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14/15
2009.05 - Rev.A
Technical Note
BD4154FV
●Ordering part number
B
D
4
Part Number
1
5
4
F
Part Number
V
-
Package
FV : SSOP-B20
E
2
Packaging and forming specification
E2: Embossed tape and reel
(SSOP-B20)
SSOP-B20
<Tape and Reel information>
6.5 ± 0.2
11
0.3Min.
4.4 ± 0.2
6.4 ± 0.3
20
1
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
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
)
10
0.1± 0.1
1.15 ± 0.1
0.15 ± 0.1
0.1
0.65
0.22 ± 0.1
1pin
(Unit : mm)
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Reel
15/15
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2009.05 - Rev.A
Notice
Notes
No copying or reproduction of this document, in part or in whole, is permitted without the
consent of ROHM Co.,Ltd.
The content specified herein is subject to change for improvement without notice.
The content specified herein is for the purpose of introducing ROHM's products (hereinafter
"Products"). If you wish to use any such Product, please be sure to refer to the specifications,
which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
information, ROHM shall bear no responsibility for such damage.
The technical information specified herein is intended only to show the typical functions of and
examples of application circuits for the Products. ROHM does not grant you, explicitly or
implicitly, any license to use or exercise intellectual property or other rights held by ROHM and
other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the
use of such technical information.
The Products specified in this document are intended to be used with general-use electronic
equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices).
The Products specified in this document are not designed to be radiation tolerant.
While ROHM always makes efforts to enhance the quality and reliability of its Products, a
Product may fail or malfunction for a variety of reasons.
Please be sure to implement in your equipment using the Products safety measures to guard
against the possibility of physical injury, fire or any other damage caused in the event of the
failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM
shall bear no responsibility whatsoever for your use of any Product outside of the prescribed
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The Products are not designed or manufactured to be used with any equipment, device or
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