Secondary LDO Regulator Series for Local Power Supplies
500mA Secondary LDO Regulators
for Local Power Supplies
BD□□KA5,BD□□KA5W Series,BD00KA5W Series
No.09024EAT01
●General
Description
The BD□□KA5 series are low-saturation regulators that are available for output currents up to 500mA. The output voltage
precision is
±1%.
These secondary LDO regulators are offered in several output voltages and package lineups with or
without ON/OFF switches (that set the circuit current to 0μA at shutdown). This series can be used for a broad spectrum of
applications ranging from TVs and car audio systems to HDDs, PCs, and DVDs. There regulators have a built-in overcurrent
protection circuit that prevents the destruction of the IC, due to output short circuits and a thermal shutdown circuit.
●Features
1) Maximum output current : 500½A
2) Output voltage precision :
±1%
3) Low-saturation voltage with PMOS output : 0.12V Typ.(Io=200mA)
4) Built-in over-current protection circuit
5) Built-in thermal shutdown circuit
6) Shutdown switch(BD□□KA5WFP and BD□□KA5WF series)
7) TO252-3,TO252-5 and SOP8 package lineup
8) Operating temperature range : -40℃ to +105℃
9) Ceramic capacitor compatible(recommended capacitance : 1μF or greater)
●Applications
Microcontrollers and all electronic devices that use logic circuits
●Product
line up
Part Number
BD□□KA5WFP
BD□□KA5WF
BD□□KA5FP
1.0
○
○
○
1.2
○
○
○
1.5
○
○
○
1.8
○
○
○
2.5
○
○
○
3.0
○
○
○
3.3
○
○
○
Variable
○
○
-
Package
TO252-5
SOP8
TO252-3
Part Number：BD□□KA5□
□
a
b c
Symbol
□□
10
12
15
18
Switch
a
Details
Output Voltage Designation
Output Voltage(V)
□□
1.0V(Typ.)
25
1.2V(Typ.)
30
1.5V(Typ.)
33
1.8V(Typ.)
00
Output Voltage(V)
2.5V(Typ.)
3.0V(Typ.)
3.3V(Typ.)
Variable Output Typ
b
Package
“W” included：Built-in shutdown switch
“W” not included：No shutdown switch
FP：TO252-5 / TO252-3
F：SOP8
c
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/9
2009.04 - Rev.A
BD□□KA5,BD□□KA5W Series,BD00KA5W Series
●Absolute
Maximum Ratings(Ta=25℃)
Parameter
Power Supply Voltage
Output Control Terminal Voltage
TO252-3
Power Dissipation TO252-5
SOP8
Operating Temperature Range
Ambient Storage Temperature
Maximum Junction Temperature
*1
*2
*3
*4
Technical Note
Symbol
Vcc
V
CTL
Pd
Topr
Tstg
Tjmax
Limits
-0.3½+7.0
-0.3½Vcc
*1
1200
*2
1300
*3
687.6
*4
-40½+105
-55½+150
150
*1
Unit.
V
V
mW
℃
℃
℃
Must not exceed Pd
When a 70mm×70mm×1.6mm glass epoxy board is used. Reduce by 9.6 mW/℃ over 25℃.
When a 70mm×70mm×1.6mm glass epoxy board is used. Reduce by 10.4mW/℃ over 25℃.
When a 70mm×70mm×1.6mm glass epoxy board is used. Reduce by 5.5 mW/℃ over 25℃.
●Recommended
Operating Range (Ta=25℃)
Parameter
Symbol
Input Power Supply Voltage
Vcc
Output Current
Io
*5
Output Voltage Configuration Range
Vo
Output Control Terminal Voltage
V
CTL
*5
Only BD00KA5WFP and BD00KA5WF
Min.
2.3
0
1.0
0
Max.
5.5
500
4.0
Vcc
Unit.
V
mA
V
V
●Electrical
Characteristics (abridged)
BD□□KA5WFP / WF / FP
(Unless specified otherwise,Ta=25℃,V
CTL
=2V,Vcc=2.5V(Vo=1.0V,1.2V,1.5V,1.8V),Vcc=3.3V(Vo=2.5V),Vcc=5.0V(Vo=3.0V,3.3V))
Parameter
Symbol
Min.
Typ.
Max.
Unit.
Conditions
Output Voltage
Circuit Current at Shutdown
Minimum I/O Voltage
Difference
*6
Output Current Capacity
Input Stability
*7
Load Stability
Output Voltage
*8
Temperature Coefficient
Vo
Isd
ΔVd
Io
Reg.I
Reg.L
Tcvo
Vo(T)-0.015
Vo(T)×0.99
-
-
500
-
-
-
Vo(T)
Vo(T)
0
0.12
-
10
25
±100
Vo(T)+0.015
Vo(T)×1.01
1
0.20
-
35
75
-
V
V
μA
V
mA
mV
mV
ppm/℃
Io＝200mA (Vo=1.0V,1.2V)
Io＝200mA (Vo≧1.5V)
V
CTL
=0V,Io=0mA
(during OFF mode)
Io=200mA,Vcc=0.95×Vo
Vcc=Vo+0.5V→5.5V,Io=200mA
Io=0mA→500mA
Io=5mA,Tj=0½125℃
Vo(T)：Preset output voltage value
*6 When Vo≧2.5V
*7 When 1.0≦Vo≦1.8V, Vcc=2.3V→5.5V
*8 Design guarantee(100% shipping inspection not performed)
BD00KA5WFP / WF
*9
(Unless specified otherwise, Ta=25℃, Vcc=2.5V,VL＝2V,R1=30kΩ,R2=30kΩ )
Parameter
Symbol
Min.
Typ.
Max.
Circuit Current at Shutdown
Reference Voltage
Minimum I/O Voltage
Difference*10
Output Current Capacity
Input Stability
Load Stability
Output Voltage
Temperature Coefficient
*11
*9
*10
*11
Unit.
μA
V
V
mA
mV
mV
ppm/℃
Isd
V
ADJ
ΔVd
Io
Reg.I
Reg.L
Tcvo
-
0.742
-
500
-
-
-
0
0.750
0.12
-
10
25
±100
1
0.758
0.20
-
35
75
-
Conditions
V
CTL
=0V, Io=0mA
(during OFF mode)
Io=50mA
Io=200mA,Vcc=0.95×Vo
Vcc=Vo+0.5V→5.5V,Io=200mA
Io=0mA→500mA
Io=5mA,Tj=0½125℃
VOUT=VADJ×(R1+R2)÷R1(V)
VADJ×0.75V(Typ.)
When Vo≧2.5V
Design guarantee(100% shipping inspection not performed)
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
2/9
2009.04 - Rev.A
BD□□KA5,BD□□KA5W Series,BD00KA5W Series
●Reference
Data (Unless specified otherwise, Vcc=25V,V
CTL
=2V,and Io=0mA)
0.5
Technical Note
2.0
2.0
[BD15KA5WFP]
1.8
[BD15KA5WFP]
1.8
[BD15KA5WFP]
OUTPUT VOLTAGE:VOUT[V]
]
1.4
1.2
1.0
0.8
0.6
0.4
0.2
OUTPUT VOLTAGE:VOUT[V]
]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
CIRCUIT CURRENT:ICC[mA]
0.4
1.6
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0.3
0.2
0.1
0.0
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0.0
SUPPLY VOLTAGE:VCC[V]
SUPPLY VOLTAGE:VCC[V]
SUPPLY VOLTAGE:VCC[V]
Fig.1 Circuit current
2.0
1.8
OUTPUT VOLTAGE:VOUT[V]
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5
OUTPUT CURRENT:IOUT[A]
[BD15KA5WFP]
300
Fig.2 Input Stability
（Io=0mA）
[BD33KA5WFP]
60
55
50
RIPPLE REJECTION:R.R[dB]
45
40
35
30
25
20
15
10
5
Fig.3 Input Stability
（Io=500mA）
[BD15KA5WFP]
DROPOUT VOLTAGE:
Δ
Vd[mV]
250
200
150
100
50
0
0
50
100
150 200
250 300
350 400
450 500
0
10000
10 15 20 25
100
35 40 45
1000
55 60 65 70 75 80
100000
30
50
85 90
OUTPUT CURRENT:IOUT[mA]
FREQUENCY:f[Hz]
Fig.4 Load Stability
1.6
1.6
Fig.5 Input/Output Voltage Difference
（Vcc=3.135V）
1.0
10
Fig.6 Ripple Rejection
（ein=10dBV,Io=100mA）
[BD15KA5WFP]
[BD15KA5WFP]
0.9
[BD15KA5WFP]
OUTPUT VOLTAGE:VOUT[V]
CIRCUIT CURRENT:Icc[mA]
1.5
1.5
1.5
1.5
1.5
1.4
1.4
1.4
-40
-20
0
20
40
60
80
100
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-40
-20
0
20
40
60
80
100
CIRCUIT CURRENT:Icc[mA]
1.6
0.8
8
6
4
2
0
0.0
0.1
0.2
0.3
0.4
0.5
TEMPERATURE:Ta[
℃
]
TEMPERATURE
:Ta[℃]
OUTPUT CURRENT:IOUT[A]
Fig.7 Output Voltage
（Io=5mA）
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.0
0.5
1.0
1.5
2.0
2.5
Fig.8 Circuit Current
Temperature Characteristics
200
180
160
140
120
100
80
60
40
20
0
Fig.9 Circuit Current by load Level
2.0
1.9
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
100
120
140
[BD15KA5WFP]
[BD15KA5WFP]
[BD15KA5WFP]
OUTPUT VOLTAGE:VOUT[V]
]
CONTROL CURRENT:ICTL[
μ
A]
3.0
3.5
4.0
4.5
5.0
5.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
OUTPUT VOLTAGE:VOUT[V]
160
180
200
CONTROL VOLTAGE:VCTL[V]
CONTROL VOLTAGE:VCTL[V]
TEMPERATURE:[
℃]
Fig.10 CTL Voltage vs. Output Voltage
Fig.11 CTL Voltage vs. Output Current
Fig.12 Thermal Shutdown
Circuit Characteristics (Io=5mA)
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
3/9
2009.04 - Rev.A
BD□□KA5,BD□□KA5W Series,BD00KA5W Series
●Block
diagrams, Standard circuit examples
[BD00KA5WFP]
GND(FIN)
＊Output
voltage configuration
1μF
Technical Note
[BD00KA5WF]
VOUT=VADJ×（R1+R2）÷R1(V)
：VADJ=0.75V(Typ.)
：A
value of approximately 30kΩ
is recommended for R1.
Vcc(8PIN)
GND(7PIN)
GND(6PIN)
CTL (5PIN)
Vref
Driver
Vref
TSD
Vcc (2PIN)
CTL (1PIN)
N.C.(3PIN)
1μF
1μF
Driver
＊Output
voltage configuration
VOUT=VADJ×（R1+R2）÷R1(V)
：VADJ=0.75V(Typ.)
：A
value of approximately 30kΩ
is recommended for R1.
OCP
OUT (4PIN)
R2
ADJ(5PIN)
R1
TOP VIEW
FIN
OUT(1PIN)
TSD
OCP
TO252-5(BD00KA5WFP)
Pin No.
1
2
3
4
5
FIN
PinName
CTL
Vcc
N.C.
OUT
ADJ
GND
Fig.13
Function
Output voltage ON/OFF control
Power supply voltage input
Unconnected terminal
Voltage output
Output voltage configuration terminal
GND
ADJ(2PIN)
1μF
R2
R1
N.C.(3PIN) N.C.(4IN)
Fig.16
3
12
4 5
TO252-5
SOP8(BD00KA5WF)
Pin No.
1
2
3
4
5
6
7
8
Pin Name
OUT
ADJ
N.C.
CTL
GND
Vcc
Function
Voltage output
Output voltage configuration terminal
Unconnected terminal
Output voltage ON/OFF control
GND
Power supply voltage input
TOP VIEW
8
5
1
4
SOP8
[BD□□KA5WFP]
Vref
GND(FIN)
Driver
R2
R1
[BD□□KA5WF]
1μF
TSD
Vcc
CTL (1PIN)
(2PIN)
OCP
OUT (4PIN)
TOP VIEW
FIN
Vcc(8PIN)
GND(7PIN)
GND(6PIN)
CTL (5PIN)
N.C.(3PIN)
1μF
1μF
N.C.(5PIN)
Fig.14
TO252-5(BD□□KA5WFP)
Pin No.
1
2
3
4
5
FIN
Pin Name
CTL
Vcc
N.C.
OUT
N.C.
GND
Function
Output voltage ON/OFF control
Power supply voltage input
Unconnected terminal
Vref
TSD
Driver
OCP
R2
R1
3
12
4 5
TO252-5
OUT(1PIN)
N.C.(3PIN)
1μF
Voltage output
Unconnected terminal
GND
N.C.(3PIN) N.C.(4IN)
Fig.17
SOP8(BD□□KA5WF)
Pin No.
1
2
Pin Name
OUT
N.C.
CTL
GND
Vcc
Function
Voltage output
TOP VIEW
8
5
Vref
1
Unconnected terminal
Output voltage ON/OFF control
GND
Power supply voltage input
4
Driver
R2
R1
3
4
5
6
7
8
SOP8
TSD
N.C.(2PIN)
Vcc
(1PIN)
1μF
OCP
OUT (3PIN)
1μF
TOP VIEW
FIN
Fig.15
TO252-5(BD□□KA5FP)
Pin No.
1
2
3
FIN
Pin Name
Vcc
N.C.
OUT
GND
Function
Power supply voltage input
Unconnected terminal
Voltage output
GND
N.C. pins are electrically open to the inside of the IC chip.
2
1
3
TO252-3
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
4/9
2009.04 - Rev.A
BD□□KA5,BD□□KA5W Series,BD00KA5W Series
●Input
/ Output Equivalent Circuit Diagrams
Vcc
Vcc Vcc
Vcc
Technical Note
※
31.25k
Ω
2k
Ω
CTL
25k
Ω
R2
OUT
With BD00KA5WFP/WF,R1and R2 are connected
outside the IC between ADJ and GND and
between OUT and ADJ.
ADJ
Fig.18
●Thermal
Design
2.0
R1
(BD00KA5WFP/WF)
Fig.19
TO252-5
Rohm standard board mounting
Board size：70×70×1.6½½
2
Copper foil area：7×7½½
θja=96.2(℃/W)
2.0
TO252-3
Rohm standard board mounting
Board size：70×70×1.6½½
2
Copper foil area：7×7½½
θja=104.2(℃/W)
1000
SOP8
(1)When using a standard board:
θj-c=181.8(℃/W)
(2) When using an IC alone
θj-a=222.2(℃/W)
1.6
1.6
800
Power Dissipation
：
Pd(W)
Power Dissipation：Pd(W)
Power Dissipation
：
Pd(W)
許容損失：Pd(W)
1.30
1.2
Power Dissipation
：
Pd(W)
許容損失：Pd(W)
1.20
1.2
687.6mW
600
(1)
400
0.8
0.8
562.6mW
(2)
0.4
0.4
200
0.0
0
25
50
75
100
125
150
0.0
0
25
50
75
100
125
150
0
0
25
50
75
100
125
150
Ambient temperature：Ta(℃)
周囲温度：Ta(℃)
Ambient temperature：Ta(℃)
Ambient temperature：Ta(℃)
周囲温度：Ta(℃)
Fig.20 Power Dissipation heat
reducing characteristics
Fig.21 Power Dissipation heat
reducing characteristics
Fig.22 Power Dissipation heat
reducing characteristics
When using at temperatures over Ta=25℃, please refer to the power dissipation shown in Fig.20 through 22.
The IC characteristics are closely related to the temperature at which the IC is used, so if the temperature exceeds the
maximum junction temperature Tj
MAX,
the device may malfunction or be destroyed. The heat of the IC requires sufficient
consideration regarding instantaneous destruction and long-term operation reliability. In order to protect the IC from thermal
damage, it is necessary to operate it at temperatures less than the maximum junction temperature Tj
MAX.
Even when the ambient temperature Ta is a normal temperature(25℃), the chip(junction) temperature Tj may be quite high,
so please operate the IC at temperatures less than the acceptable loss Pd.
The calculation method for power consumption Pc(W) is as follows :
Pc = (Vcc-Vo)×Io+Vcc×Icca
Acceptable loss Pd≧Pc
Solving for the load current IO in order to operate within the acceptable loss,
Io≦
Pd – Vcc×Icca
Vcc－Vo
Vcc：Input voltage
Vo：Output voltage
Io：Load current
Icca：Circuit current
It is then possible to find the maximum load current Io
MAX
with respect to the applied voltage Vcc at the time of thermal design.
Calculation Example
Example 1) When Ta=85℃, Vcc=2.5V, Vo=1.0V
0.676－2.5×Icca
Io≦
2.5-1.0
Io≦440mA (Icca : 2mA)
BA10KA5WFP（TO252-5 packaging）
θja=96.2℃/W →
-10.4mW/℃
25℃=1300mW
→
85℃=676mW
Please refer to the above information and keep thermal designs within the scope of acceptable loss for all operating
temperature ranges.
The power consumption PC of the IC when there is a short circuit (short between Vo and GND) is :
Pc=Vcc×(Icca+Ishort)
*Ishort : Short circuit current
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/9
2009.04 - Rev.A
京公网安备 11010802033920号
EEWORLD
