BD6520F-E2 [ROHM]
Large Current Output Power Management Switch ICs; 大电流输出电源管理开关IC
| 型号： | BD6520F-E2 |
| 厂家： | 
ROHM |
| 描述： | Large Current Output Power Management Switch ICs |
| 文件： | 总17页 (文件大小：567K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TECHNICAL NOTE
Power Management Switch IC Series for PCs and Digital Consumer Product
Large Current Output
Power Management Switch ICs
BD6520F, BD6522F
●Description
The power switch for expansion module is a power management switch having one circuit of N-channel Power MOS FET.
The switch realizes 50mΩ(Typ.) ON resistance. The switch turns on smoothly by the built-in charge pump, therefore, it is
possible to reduce inrush current at switch on. And soft start control by external capacitor is available.
Further, it has a discharge circuit that discharges electric charge from capacitive load at switch off, Under voltage lockout
circuit, and a thermal shutdown circuit.
●Features
1) Low on resistance (50mΩ, Typ.) N-MOS switch built in
2) Maximum output current: 2A
3) Discharge circuit built in
4) Soft start control circuit built in
5) Under voltage lockout (UVLO) circuit built in
6) Thermal shutdown (Output off latching)
7) Reverse current flow blocking at switch off (only BD6522F)
●Applications
Notebook PC, PC peripheral device, etc.
●Lineup
Parameter
BD6520F
to 5.5V
2A
BD6522F
to 5.5V
2A
Supply Voltage
Switch current
On Resistance
OUT Rise Time
OUT Fall Time
Package
3
3
50mΩ
2000us
3us
50mΩ
1000us
4us
SOP8
-
SOP8
○
Reverse current flow blocking at switch off
May.2008
●Absolute Maximum Ratings
Parameter
Symbol
VDD
Rating
Unit
V
Supply Voltage
-0.3 to 6.0
CTRL Input Voltage
VCTRL
-0.3 to 6.0
V
-0.3 to VDD + 0.3 (BD6520F)
-0.3 to 6.0 (BD6522F)
-55 to 150
V
Switch Output Voltage
VOUT
V
Storage temperature
Power dissipation
TSTG
Pd
℃
mW
560*1
*1 This value decreases 4.48mW/℃ above Ta=25℃
* Resistance radiation design is not doing.
* Operation is not guaranteed.
●Operation conditions
Parameter
Supply Voltage
Symbol
VDD
Limit
Unit
V
3.0 to 5.5
Switch current
IOUT
0
to
2
A
Operating Temperature
TOPR
-25 to 85
℃
●Electrical characteristics
◎BD6520F（Unless otherwise specified, Ta = 25℃, VDD = 5V）
Limit
Parameter
On Resistance
Symbol
Unit
Condition
Min.
Typ.
50
60
110
-
Max.
RON
1
2
-
-
70
85
220
2
mΩ
mΩ
uA
uA
V
VDD = 5V, VCTRL = 5V
VDD = 3V, VCTRL = 3V
VCTRL = 5V, OUT = OPEN
VCTRL = 0V, OUT = OPEN
VCTRL L = Low Level
VCTRL H = High Level
VCTRL = L, H
RON
IDD
-
Operating Current
IDDST
-
VCTRL
VCTRL
ICTRL
L
-
-
0.7
-
Control Input voltage
Control Input current
Turn On Delay
H
2.5
-1
-
V
0
1
uA
RL = 10Ω,SSCTL = OPEN
Trd
Tr
200
1000
2000
3
2000
7500
20
us
us
us
us
CTRL = L→H → OUT=50%
RL = 10Ω,SSCTL = OPEN
CTRL = 10% → 90%
Turn On Rise Time
Turn Off Delay
500
RL = 10Ω,SSCTL = OPEN
CTRL = H→L → OUT=50%
RL = 10Ω,SSCTL = OPEN
CTRL = 90% → 10%
Tfd
-
-
Turn Off Fall Time
Tf
1
20
Discharge Resistance
UVLO Threshold Voltage
RSWDC
-
350
2.5
2.3
200
600
2.7
2.5
300
Ω
V
VDD = 5V, VCTRL = 0V, VOUT = 5V
VDD increasing
VUVLO
H
2.3
2.1
100
VUVLO
L
V
VDD decreasing
UVLO Hysteresis Voltage
Thermal Shutdown
Threshold
VHYS
mV
VHYS = VUVLOH - VUVLO
L
TTS
-
-
135
-
-
℃
VCTRL = 5V
SSCTL Output Voltage
VSSCTL
13.5
V
VCTRL = 5V
2/16
◎BD6522F（Unless otherwise specified, Ta = 25℃, VDD = 5V）
Limit
Parameter
On Resistance
Symbol
Unit
Condition
Min.
Typ.
50
60
110
-
Max.
70
85
220
2
RON
1
2
-
-
mΩ
mΩ
uA
uA
V
VDD = 5V, VCTRL = 5V
VDD = 3.3V, VCTRL = 3.3V
VCTRL = 5V, OUT = OPEN
VCTRL = 0V, OUT = OPEN
VCTRLL = Low Level
RON
IDD
-
Operating Current
IDDST
-
VCTRL
VCTRL
ICTRL
L
-
-
0.7
-
Control Input Voltage
Control Input Current
Turn On Time
H
2.5
-1
-
V
VCTRLH = High Level
VCTRL = L, H
0
1
uA
RL = 10Ω,SSCTL = OPEN
CTRL = H → OUT =90%
RL = 10Ω,SSCTL = OPEN
CTRL = L → OUT = 10%
VDD = 5V,VCTRL = 0V
VDD increasing
TON
-
-
1000
4
3500
20
us
us
Turn Off Time
TOFF
Discharge Resistance
UVLO Threshold Voltage
RSWDC
-
350
2.5
600
2.7
2.5
300
-
Ω
V
VUVLOH
2.3
2.1
100
-
VUVLO
L
2.3
V
VDD decreasing
UVLO Hysteresis Voltage
Thermal Shutdown
Threshold
VHYS
TTS
200
135
mV
℃
VHYS = VUVLOH - VUVLO
VCTRL = 5V
L
SSCTL Output Voltage
VSSCTL
-
13.5
-
V
VCTRL = 5V
●Measurement circuit
◎BD6520F
◎BD6522F
VDD
VDD
BD6520F
BD6522F
VDDA
VDDB
SSCTL
CTRL
VDDA
VDDB
OUTA
OUTB
OUTA
OUTB
DISC
VSS
SSCTL OUTC
CTRL VSS
RL
CL
RL
CL
IOUT
IOUT
CSS
CSS
VCTRL
VCTRL
Fig.1 Measurement circuit
●Timing diagram
◎BD6520F
◎BD6522F
Tf
Tr
90%
90%
90%
VOUT
VOUT
50%
50%
10%
10%
10%
Trd
Tfd
TOFF
TON
TON
TOFF
VCTRL
VCTRL
VCTRLH
VCTRLL
VCTRLH
VCTRLL
Fig.2 Timing diagram
3/16
●Typical characteristics
◎BD6520F
80
70
60
50
40
30
20
10
0
120
100
80
60
40
20
0
80
Ta = 25℃
Ta = 25℃
70
60
50
40
30
20
10
0
VDD=3.0V
VDD=3.3V
VDD=5.0V, 5.5V
2
3
4
5
6
2
3
4
5
6
-40 -20
0
20
40
60
80 100
SUPPLY VOLTAGE : VDD [V]
SUPPLY VOLTAGE : VDD [V]
AMBITENT TEMPERATURE : Ta [℃]
Fig.3 On resistance
Fig.4 On resistance
Fig.5 Operating current
(CTRL enable)
1.0
0.8
0.6
0.4
0.2
0.0
0.10
120
100
80
60
40
20
0
VDD = 5.0V
Ta = 25℃
VDD = 5.0V
0.08
0.06
0.04
0.02
0.00
2
3
4
5
6
0
20
40
60
80
100
-40 -20
0
20
40
60
80 100
SUPPLY VOLTAGE : VDD [V]
AMBIENT TEMPERATURE : Ta [
]
℃
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.6 Operating current
(CTRL enable)
Fig.7 Operating current
(CTRL disenable)
Fig.8 Leak current
2.5
2.0
1.5
1.0
0.5
0.0
2.5
2.0
1.5
1.0
0.5
0.0
2.5
2.0
1.5
1.0
0.5
0.0
Ta = 25℃
VDD = 5.0V
VDD = 5.0V
Low to High
High to Low
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
2
3
4
5
6
AMBIENT TEMPERATURE : Ta [
]
AMBIENT TEMPERATURE : Ta [
]
℃
℃
SUPPLY VOLTAGE : VDD [V]
Fig.9 CTRL input voltage
Fig.10 CTRL input voltage H→L
Fig.11 CTRL input voltage L→H
0.4
0.3
0.2
0.1
0
0.4
5
4
3
2
1
0
Ta = 25℃
VDD = 5.0V
Ta = 25℃
0.3
0.2
0.1
0
Ton
Tr
Trd
2
3
4
5
6
2
3
4
5
6
-40 -20
0
20
40
60
80 100
SUPPLY VOLTAGE : VDD [V]
SUPPLY VOLTAGE : VDD[V]
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.13 CTRL hysteresis voltage
Fig.14 Turn On Rise time
Fig.12 CTRL hysteresis voltage
4/16
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
VDD = 5.0V
Ta = 25℃
VDD = 5.0V
Toff
Toff
Tfd
Ton
Tfd
Tf
Tr
Tf
Trd
2
3
4
5
6
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
SUPPLY VOLTAGE : VDD [V]
AMBIENT TEMPERATURE : Ta [
]
℃
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.16 Turn Off Fall time
Fig.17 Turn Off Fall time
Fig.15 Turn On Rise time
500
400
300
200
100
0
500
400
300
200
100
0
3.0
Ta = 25℃
VDD = 5.0V
VDD = 5.0V
2.8
2.6
2.4
2.2
2.0
VDD increasing
VDD decreasing
-40 -20
0
20
40
60
80 100
2
3
4
5
6
-40 -20
0
20
40
60
80 100
AMBIENT TEMPERATURE : Ta [
]
℃
SUPPLY VOLTAGE : VDD [V]
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.18 Switch discharge resistance
Fig.19 Switch discharge resistance
Fig.20 UVLO threshold voltage
100
100
0.3
VDD = 5.0V
VDD = 5.0V, Ta = 25℃, RL = 10Ω
VDD = 5.0V, Ta = 25℃, RL = 10Ω
0.2
0.1
0
10
10
1
1
1
10
100
1000
10000
1
10
100
1000
10000
-40 -20
0
20
40
60
80 100
Css [pF]
Css [pF]
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.21 UVLO hysteresis voltage
Fig.22 Turn On Rise time (vs. Css)
Fig.23 Turn Off Fall time (vs. Css)
16
16
Ta = 25℃
VDD = 5.0V
14
14
12
10
8
12
10
8
6
6
4
4
2
2
0
0
2
3
4
5
6
-40 -20
0
20
40
60
80 100
SUPPLY VOLTAGE : VDD [V]
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.24 SSCTL output voltage
Fig.25 SSCTL output voltage
5/16
◎BD6522F
120
100
80
60
40
20
0
80
70
60
50
40
30
20
10
0
80
Ta = 25℃
Ta = 25℃
70
60
50
40
30
20
10
0
VDD=3.3V
VDD=5.0V
2
3
4
5
6
-40 -20
0
20
40
60
80 100
2
3
4
5
6
SUPPLY VOLTAGE : VDD [V]
AMBIENT TEMPERATURE : Ta [
]
℃
SUPPLY CURRENT : VDD [V]
Fig.26 ON resistance
Fig.27 ON resistance
Fig.28 Operating current
(CTRL enable)
120
100
80
60
40
20
0
1.0
0.8
0.6
0.4
0.2
0.0
0.10
VDD = 5.0V
Ta = 25℃
VDD = 5.0V
0.08
0.06
0.04
0.02
0.00
0
20
40
60
80
100
-40 -20
0
20
40
60
80 100
2
3
4
5
6
AMBIENT TEMPERATURE : Ta [
]
℃
AMBIENT TEMPERATURE : Ta [
]
℃
SUPPLY VOLTAGE : VDD [V]
Fig.29 Operating current
(CTRL enable)
Fig.31 Leak current
Fig.30 Operating current
(CTRL disenable)
2.5
2.0
1.5
1.0
0.5
0.0
2.5
2.0
1.5
1.0
0.5
0.0
0.4
0.3
0.2
0.1
0
Ta = 25℃
VDD = 5.0V
Ta = 25℃
High to Low
Low to High
Low to High
High to Low
2
3
4
5
6
-40 -20
0
20
40
60
80 100
2
3
4
5
6
SUPPLY VOLTAGE : VDD [V]
AMBIENT TEMPERATURE : Ta [
]
℃
SUPPLY VOLTAGE : VDD [V]
Fig.33 CTRL input voltage
Fig.32 CTRL input voltage
Fig.34 CTRL hysteresis voltage
5
4
3
2
1
0
0.4
0.3
0.2
0.1
0.0
5
VDD = 5.0V
Ta = 25℃
VDD = 5.0V
4
3
2
1
0
2
3
4
5
6
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
DD
AMBIENT TEMPERATURE : Ta [
]
SUPPLY VOLTAGE :V [V]
AMBIENT TEMPERATURE : Ta [ ]
℃
℃
Fig.35 CTRL hysteresis voltage
Fig.36 Turn On time
Fig.37 Turn On time
6/16
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
500
400
300
200
100
0
Ta = 25℃
VDD = 5.0V
Ta = 25℃
-40 -20
0
20
40
60
80 100
2
3
4
5
6
2
3
4
5
6
AMBIENT TEMPERATURE : Ta [
]
SUPPLY VOLTAGE : VDD [V]
℃
SUPPLY VOLTAGE : VDD [V]
Fig.38 Turn Off time
Fig.39 Turn Off time
Fig.40 Switch discharge resistance
0.3
3.0
500
400
300
200
100
0
VDD = 5.0V
Ta = 25℃
VDD = 5.0V
2.8
2.6
2.4
2.2
2.0
0.2
0.1
0
VDD increasing
VDD decreasing
-40 -20
AMBIENT TEMPERATURE : Ta [ ]
℃
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
-40 -20
0
20
40
60
80 100
AMBIENT TEMPERATURE : Ta [
]
℃
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.43 UVLO hysteresis voltage
Fig.41 Switch discharge resistance
Fig.42 UVLO threshold voltage
100
16
100
10
1
VDD = 5.0V, Ta = 25℃, RL = 10Ω
VDD = 5.0V, Ta = 25℃, RL = 10Ω
Ta = 25℃
14
12
10
8
10
6
4
2
1
0
1
10
100
1000
10000
2
3
4
5
6
1
10
100
1000
10000
Css [pF]
SUPPLY VOLTAGE : VDD [V]
Css [pF]
Fig.44 Turn On time (vs. Css)
Fig.45 Turn Off time (vs. Css)
Fig.46 SSCTL output voltage
16
14
12
10
8
VDD = 5.0V
6
4
2
0
-40 -20
0
20
40
60
80 100
AMBIENT TEMPERATURE : Ta [
]
℃
Fig.47 SSCTL output voltage
7/16
●Waveform data
VDD = 5V, CL = 47uF, RL = 47Ω, unless otherwise specified.
VCTRL
VCTRL
VCTRL
(5V/div.)
(5V/div.)
(5V/div.)
VOUT
VOUT
VOUT
(5V/div.)
(5V/div.)
(5V/div.)
IOUT
IOUT
(0.5A/div.)
IOUT
(0.5A/div.)
(0.5A/div.)
TIME (1ms/div.)
TIME (5ms/div.)
TIME (1ms/div.)
Fig.48 Turn On Rise Time
(BD6520F)
Fig.49 Turn Off Fall Time
(BD6520F)
Fig.50 Turn On Rise Time
(BD6522F)
VCTRL
VCTRL
VCTRL
(5V/div.)
(5V/div.)
(5V/div.)
CL=330uF
CL=330uF
Open
Open
VOUT
470pF
(5V/div.)
1000pF
4700pF
2200pF
IOUT
IOUT
IOUT
(0.5A/div.)
(0.2A/div.)
(0.5A/div.)
TIME (5ms/div.)
TIME (2ms/div.)
TIME (2ms/div.)
Fig.51 Turn Off Fall Time
(BD6522F)
Fig.52 Inrush current vs. Css
(BD6520F)
Fig.53 Inrush current vs. Css
(BD6522F)
VCTRL
VCTRL
(5V/div.)
(5V/div.)
DISC terminal not in use
DISC terminal in use
VOUT
VOUT
(2V/div.)
(2V/div.)
Temperature decline
Latch release
Return
Thermal shut down
TIME (500ms/div.)
TIME (20ms/div.)
Fig.54 Discharge: CL = 47uF, RL = Open
(BD6522F)
Fig.55 Thermal shutdown
VDD
(2V/div.)
VDD
VOUT
(2V/div.)
(2V/div.)
VOUT
(2V/div.)
TIME (500ms/div)
TIME (500ms/div)
Fig.56 UVLO (at VDD increase)
Fig.57 UVLO (at VDD decrease)
8/16
●Block diagram, pin configuration, pin description
(BD6520F)
OUTA
VDDA
1
8
OUTB
7
VDDB
2
Oscillator
SSCTL
Charge
Pump
OUTC
6
3
＋
UVLO
－
Band
Gap
Thermal
S
R
Q
Shutdown
FF
1
2
8
7
6
OUTA
VDDA
VDDB
OUTB
OUTC
CTRL
3
SSCTL
4
CTRL
4
5
VSS
VSS
5
Fig.58 Block diagram(BD6520F)
Pin No.
1,2
Symbol
Pin Function
Switch input pin
VDDA, VDDB
SSCTL
At use, connect each pin outside.
Soft start setting pin
3
Add external capacitor, it is possible to delay switch On, Off time.
Control input pin
4
5
CTRL
VSS
Switch On at High level, switch Off at Low level.
Ground
Switch output pin
6,7,8
OUTA, OUTB, OUTC
At use, connect each pin outside.
9/16
(BD6522F)
VDDA
OUTA
8
1
VDDB
2
OUTB
7
Oscillator
Charge
Pump
SSCTL
3
＋
UVLO
－
DISC
6
Band
Gap
Thermal
Shutdown
S
Q
FF
R
1
2
8
7
6
OUTA
VDDA
VDDB
OUTB
DISC
CTRL
4
3
SSCTL
CTRL
4
5
VSS
VSS
5
Fig.59 Block diagram(BD6522F)
Pin No.
1,2
Symbol
Pin Function
Switch input pin
VDDA, VDDB
SSCTL
At use, connect each pin outside.
Soft start setting pin
3
4
Add external capacitor, it is possible to delay switch On, Off time.
Control input pin
CTRL
Switch On at High level, switch Off at Low level.
Ground
5
6
VSS
DISC
Discharge pin
Switch output pin
7,8
OUTA, OUTB
At use, connect each pin outside.
10/16
●I/O circuit
Equivalent circuit
BD6520F
Equivalent circuit
BD6522F
Symbol
Pin No.
SSCTL
SSCTL
SSCTL
CTRL
DISC
OUT
3
CTRL
CTRL
4
DISC
6
(BD6522F)
6 (BD6520F),
7, 8
OUT
OUT
Fig.60 I/O circuit
●Functional description
1. Switch operation
VDD pin and OUT pin are connected to the drain and the source of switch MOSFET respectively. And the VDD is used also
as power source input to internal control circuit.
When CTRL input is set to High level and the switch is turned on, VDD and OUT is connected by a 50mΩ switch. In a normal
condition, current flows from VDD to OUT. If voltage of OUT is higher than VDD, current flows from OUT to VDD, since the
switch is bidirectional.
In BD6520F, there is a parasitic diode between the drain and the source of switch MOSFET. Therefore, even when the switch
is off, if the voltage of OUT is higher than that of VDD, current flows from OUT to VDD. In BD6522F, there is not this parasitic
diode, it is possible to prevent current from flowing reversely from OUT to VDD.
2. Thermal shutdown
Thermal shut down circuit turns off the switch when the junction temperature exceeds 135℃(Typ.).
The switch off status of the thermal shut down is latched. Therefore, even when the junction temperature goes down, switch
off is maintained. To release the latch, it is necessary to input a signal to switch off to CTRL terminal or make UVLO status.
When the switch on signal is input or UVLO is released, the switch output is recovered.
The thermal shut down circuit works when CTRL signal is active.
11/16
3. Low voltage malfunction prevention circuit (UVLO)
The UVLO circuit monitors the voltage of the VDD pin, when the CTRL input is active. UVLO circuit prevents the switch from
turning on until the VDD exceeds 2.5V(Typ.). If the VDD drops below 2.3V(Typ.) while the switch turns on, then UVLO shuts off
the switch.
4. Soft start control
In BD6520F/22F, soft start is carried out in order to reduce inrush current at switch on. Further, in order to reduce inrush
current, soft start control pin (SSCTL) is prepared.
By connecting external capacitor to between SSCTL and GND, it is possible to make smoother the switch rise time. When the
switch is enabled, SSCTL outputs voltage of about 13.5V.
SSCTL terminal requires high impedance, so pay attention in packaging it so that there should not be leak current. And when
voltage is impressed from the outside to SSCTL terminal, switch on, off cannot be made correctly.
5. Discharge circuit
When the switch between the VDD and the OUT is OFF, the 200Ω(Typ.) discharge switch between OUT and GND turns on.
By turning on this switch, electric charge at capacitive load is discharged.
In BD6522F, the input of discharge circuit is separately prepared as DISC pin. When to use the discharge circuit, connect
OUT pin and DISC pin outside.
●Timing diagram
VDD
VCTRL
VOUT
Discharge circuit
ON
OFF
ON
Fig.61 Normal operation
VDD
VUVLOL
VUVLOH
VCTRL
VOUT
Discharge circuit
ON
OFF
Fig.62 UVLO operation
12/16
Over temperature Over temperature
corrected
occurs
Over temperature
corrected
Over temperature
occurs
VDD
VCTRL
VOUT
Latch
Release
Release
Set
Set
Release
ON OFF
Release
OFF
Discharge circuit
OFF
Fig.63 Thermal shutdown operation
●Typical application circuits
BD6520F
OUTA
BD6522F
Power Supply
Power Supply
VDDA
VDDA
VDDB
OUTA
1uF
Load
1uF
Load
VDDB
SSCTL
CTRL
OUTB
OUTC
OUTB
DISC
VSS
Css
Css
SSCTL
CTRL
On/Off
On/Off
VSS
Fig.64 Power supply switch circuit (BD6520F)
Fig.65 Power supply switch circuit (BD6522F)
BD6522F
BD6522F
Power Supply A
VDDA
VDDB
OUTA
OUTB
VDDA
VDDB
OUTA
OUTB
Power Supply B
On/Off
Load
Css
Css
DISC
VSS
DISC
VSS
SSCTL
CTRL
SSCTL
CTRL
On/Off
Fig.66 2 power supply changeover switch circuit (BD6522F)
13/16
●Thermal derating characteristic
(SOP8)
600
500
400
300
200
100
0
0
25
50
75
100
125
150
AMBIENT TEMPERATURE: Ta [
]
℃
Fig. 67 Power dissipation curve
● Cautions on use
(1) Absolute Maximum Ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc., can
break down devices, thus making impossible to identify breaking mode such as a short circuit or an open circuit. If any
special mode exceeding the absolute maximum ratings is assumed, consideration should be given to take physical safety
measures including the use of fuses, etc.
(2) Operating conditions
These conditions represent a range within which characteristics can be provided approximately as expected. The electrical
characteristics are guaranteed under the conditions of each parameter.
(3) Reverse connection of power supply connector
The reverse connection of power supply connector can break down ICs. Take protective measures against the breakdown
due to the reverse connection, such as mounting an external diode between the power supply and the IC’s power supply
terminal.
(4) Power supply line
Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. In this regard, for
the digital block power supply and the analog block power supply, even though these power supplies has the same level of
potential, separate the power supply pattern for the digital block from that for the analog block, thus suppressing the
diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns. For the
GND line, give consideration to design the patterns in a similar manner.
Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. At the
same time, in order to use an electrolytic capacitor, thoroughly check to be sure the characteristics of the capacitor to be used
present no problem including the occurrence of capacity dropout at a low temperature, thus determining the constant.
(5) GND voltage
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state.
Furthermore, check to be sure no terminals are at a potential lower than the GND voltage including an actual electric
transient.
14/16
(6) Short circuit between terminals and erroneous mounting
In order to mount ICs on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can
break down the ICs. Furthermore, if a short circuit occurs due to foreign matters entering between terminals or between the
terminal and the power supply or the GND terminal, the ICs can break down.
(7) Operation in strong electromagnetic field
Be noted that using ICs in the strong electromagnetic field can malfunction them.
(8) Inspection with set PCB
On the inspection with the set PCB, if a capacitor is connected to a low-impedance IC terminal, the IC can suffer stress.
Therefore, be sure to discharge from the set PCB by each process. Furthermore, in order to mount or dismount the set PCB
to/from the jig for the inspection process, be sure to turn OFF the power supply and then mount the set PCB to the jig. After
the completion of the inspection, be sure to turn OFF the power supply and then dismount it from the jig. In addition, for
protection against static electricity, establish a ground for the assembly process and pay thorough attention to the
transportation and the storage of the set PCB.
(9) Input terminals
In terms of the construction of IC, parasitic elements are inevitably formed in relation to potential. The operation of the
parasitic element can cause interference with circuit operation, thus resulting in a malfunction and then breakdown of the
input terminal. Therefore, pay thorough attention not to handle the input terminals, such as to apply to the input terminals a
voltage lower than the GND respectively, so that any parasitic element will operate. Furthermore, do not apply a voltage to
the input terminals when no power supply voltage is applied to the IC. In addition, even if the power supply voltage is applied,
apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical
characteristics.
(10) Ground wiring pattern
If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern
from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to
the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND.
Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well.
(11) External capacitor
In order to use a ceramic capacitor as the external capacitor, determine the constant with consideration given to a
degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature, etc.
(12) Thermal shutdown circuit (TSD)
When junction temperatures become 135°C (typ.) or higher, the thermal shutdown circuit operates and turns a switch
OFF. The thermal shutdown circuit, which is aimed at isolating the LSI from thermal runaway as much as possible, is
not aimed at the protection or guarantee of the LSI. Therefore, do not continuously use the LSI with this circuit
operating or use the LSI assuming its operation.
(13) Thermal design
Perform thermal design in which there are adequate margins by taking into account the power dissipation (Pd) in actual
states of use.
15/16
●Product Designation
-
B
D
6
5
2
0
F
E
2
Part No.
BD6520
BD6522
Package type
F: SOP
Packaging and forming specification
E2: Embossed tape and reel
SOP8
<Dimension>
<Tape and Reel information>
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
E2
5.0 0.2
8
5
(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)
1
4
0.15 0.1
0.1
1.27
0.4 0.1
Direction of feed
1Pin
Reel
(Unit:mm)
When you order , please order in times the amount of package quantity.
※
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level
of reliability and the malfunction of which would directly endanger human life (such as medical
instruments, transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers
and other safety devices), please be sure to consult with our sales representative in advance.
It is our top priority to supply products with the utmost quality and reliability. However, there is always a chance
of failure due to unexpected factors. Therefore, please take into account the derating characteristics and allow
for sufficient safety features, such as extra margin, anti-flammability, and fail-safe measures when designing in
order to prevent possible accidents that may result in bodily harm or fire caused by component failure. ROHM
cannot be held responsible for any damages arising from the use of the products under conditions out of the
range of the specifications or due to non-compliance with the NOTES specified in this catalog.
Thank you for your accessing to ROHM product informations.
More detail product informations and catalogs are available, please contact your nearest sales office.
THE AMERICAS / EUROPE / ASIA / JAPAN
ROHM Customer Support System
Contact us : webmaster@ rohm.co.jp
www.rohm.com
TEL : +81-75-311-2121
FAX : +81-75-315-0172
Copyright © 2008 ROHM CO.,LTD.
21 Saiin Mizosaki-cho, Ukyo-ku, Kyoto 615-8585, Japan
Appendix1-Rev2.0
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