Datasheet
Termination Regulator for DDR-SDRAMs
BD3531F
General Description
Key Specifications
BD3531F is a termination regulator that complies with
JEDEC requirements for DDR-SDRAM. This linear
power supply uses a built-in N-channel MOSFET and
high-speed OP-AMPS specially designed to provide
excellent transient response. It has a sink/source
current capability up to 1.5A and has a power supply
bias requirement of 5.0V for driving the N-channel
MOSFET. By employing an independent reference
voltage input (VDDQ) and a feedback pin (VTTS), this
termination regulator provides excellent output voltage
accuracy and load regulation as required by JEDEC
standards. Additionally, BD3531F has a reference
power supply output (VREF) for DDR-SDRAM or for
memory controllers. Unlike the VTT output that goes to
“Hi-Z” state, the VREF output is kept unchanged when
EN input is changed to “Low”, making this IC suitable
for DDR-SDRAM under “Self Refresh” state.
Termination Input Voltage Range:
1.0V to 5.5V
VCC Input Voltage Range:
4.5V to 5.5V
Output Voltage:
1/2xVVDDQ V(Typ)
Output Current:
1.5A(Max)
High Side FET ON-Resistance:
0.4Ω(Typ)
Low side FET ON-Resistance:
0.4Ω(Typ)
Standby Current:
0.8mA (Typ)
Operating Temperature Range: -10°C to +100°C
Package
W(Typ) x D(Typ) x H(Max)
Features
Incorporates a Push-Pull Power Supply for
Termination (VTT)
Incorporates a Reference Voltage Circuit (VREF)
Incorporates an Enabler
Incorporates an Undervoltage Lockout (UVLO)
Incorporates a Thermal Shutdown Protector (TSD)
Compatible with Dual Channel (DDR-II)
SOP8
5.00mm x 6.20mm x 1.71mm
Applications
Power supply for DDR I/II - SDRAM
Typical Application Circuit, Block Diagram
VCC
VTT_IN
VDDQ
VDDQ
VCC
VCC
VCC
VTT_IN
VCC
50kΩ
UVLO
Reference
Block
50kΩ
Thermal
VCC
UVLO
TSD
EN
UVLO
TSD
EN
UVLO
TSD
VTT
VTT
VTTS
Protection
Enable
VREF
EN
½x
VDDQ
GND
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has no designed protection against radioactive rays
1/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Pin Configuration
Pin Descriptions
TOP VIEW
GND 1
EN 2
8 VTT
7 VTT_IN
VTTS 3
6 VCC
VREF 4
5 VDDQ
Pin No.
Pin Name
1
GND
Pin Function
GND Pin
2
EN
3
VTTS
Enable Input Pin
Detector Pin for Termination Voltage
4
VREF
Reference Voltage Output Pin
5
VDDQ
Reference Voltage Input Pin
6
VCC
7
VTT_IN
8
VTT
VCC Pin
Termination Input Pin
Termination Output Pin
Description of Blocks
1.
VCC
The VCC pin is for the independent power supply input that operates the internal circuit of the IC. It is the voltage at
this pin that drives the IC’s amplifier circuits. The VCC input ranges 5V and maximum current consumption is 4mA. A
bypass capacitor of 10μF or so should be connected to this pin when using the IC in an application circuit.
2.
VDDQ
This is the power supply input pin for an internal voltage divider network. The voltage at VDDQ is halved by two 50kΩ
internal voltage-divider resistors and the resulting voltage serves as reference for the VTT output. Since VTT =
1/2VDDQ, the JEDEC requirement for DDR-SDRAM can be satisfied by supplying the correct voltage to VDDQ.
Noise input should be avoided at the VDDQ pin as it is also included by the voltage-divider at the output. An RC filter
consisting of a resistor and a capacitor (220Ω and 2.2μF, for instance,) may be used to reduce the noise input but
make sure that it will not significantly affect the voltage-divider’s output.
3.
VTT_IN
VTT_IN is the power supply input pin for the VTT output. Input voltage may range from 1.0V to 5.5V, but
consideration must be given to the current limit dictated by the ON-Resistance of the IC and to the change in allowable
loss due to input/output voltage difference.
Generally, the following voltages are supplied:
・ DDR I
VVTT_IN =2.5V
・ DDRII
VVTT_IN =1.8V
Take note that a high-impedance voltage input at VTT_IN may result in oscillation or degradation in ripple rejection, so
connecting a 100μF capacitor with minimal change in capacitance to VTT_IN terminal is recommended. However,
this impedance may depend on the characteristics of the power supply input and the impedance of the PC board wiring,
which must be carefully checked before use.
4.
VREF
BD3531F provides a constant voltage, VREF, which is independent from the VTT output and can serve as reference
input for memory controllers and DRAMs. The voltage level of VREF is kept constant even if the EN pin is at “Low”
level, making the use of this IC compatible with the “Self Refresh” state of DRAMs.
In order to stabilize the output voltage, connecting the correct combination of capacitor and resistor to VREF is
necessary. For this purpose, a combination of 1.0μF to 2.2μF ceramic capacitor, characterized by minimal variation in
capacitance, and a 0.5Ω to 2.2Ω phase compensating resistor is recommended.
5.
VTTS
VTTS is a sense pin for the load regulation of the VTT output voltage. In case the wire connecting VTT pin and the load
is too long, connecting VTTS pin to the part of the wire nearer to the load may improve load regulation.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
2/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Description of Blocks – continued
6.
VTT
This is the output pin for the DDR memory termination voltage and it has a sink/source current capability of ±1.5A. VTT
voltage tracks the voltage at VDDQ pin divided in half. The output is turned OFF when EN pin is “Low” or when either
the VCC UVLO or the thermal shutdown protection function is activated.
Always connect a capacitor to VTT pin for loop gain and phase compensation and for reduction in output voltage
variation in the event of sudden load change. Be careful in choosing the capacitor as insufficient capacitance may
cause oscillation and high ESR (Equivalent Series Resistance) may result in increased output voltage variation during
a sudden change in load. Using a low-ESR ceramic capacitor, however, may reduce the loop gain and phase margin
and may cause oscillation. But this effect can be lessened by connecting a resistor in series with the capacitor. A 220μF
functional polymer capacitor (OS-CON, POS-CAP, NEO-CAP) is recommended, though ambient temperature and
other conditions should also be considered.
7.
EN
A “High” input of 2.0V or higher to EN turns ON the VTT output. A “Low” input of 0.8V or less, on the other hand, turns
VTT to a Hi-Z state. With a “Low” EN input, however, the VREF output remains ON, provided that sufficient VCC and
VDDQ voltages have been established.
Absolute Maximum Ratings
Parameter
Symbol
Input Voltage
Limit
7
V
7
(Note 1)
V
VVTT_IN
7 (Note 1)
V
VVDDQ
(Note 1)
V
VCC
EN Input Voltage
VEN
Termination Input Voltage
VDDQ Reference Voltage
Unit
(Note 1)
7
Output Current
IVTT
1.5
A
Power Dissipation1
Pd1
0.56 (Note 2)
W
Power Dissipation2
Pd2
0.69 (Note 3)
W
Operating Temperature Range
Topr
-10 to +100
°C
Tstg
-55 to+150
°C
Tjmax
+150
°C
Storage Temperature Range
Maximum Junction Temperature
(Note 1) Should not exceed Pd.
(Note 2) Derate by 4.48mW/°C for Ta over 25°C (With no heat sink).
(Note 3) Derate by 5.52mW/°C for Ta over 25°C (When mounted on a board 70mm x 70mm x 1.6mm Glass-epoxyPCB).
Caution: Operating the IC over the absolute maximum ratings may damage the IC. In addition, it is impossible to predict all destructive situations such as
short-circuit modes, open circuit modes, etc. Therefore, it is important to consider circuit protection measures, like adding a fuse, in case the IC is operated in a
special mode exceeding the absolute maximum ratings.
Recommended Operating Conditions (Ta=25°C)
Parameter
Input Voltage
Termination Input Voltage
EN Input Voltage
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Symbol
Min
Max
Unit
VCC
4.5
5.5
V
VVTT_IN
1.0
5.5
V
VEN
-0.3
+5.5
V
3/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Electrical Characteristics
(Unless otherwise noted, Ta=25°C VCC=5V VEN=3V VVDDQ=2.5V VVTT_IN=2.5V)
Standard Value
Parameter
Symbol
Min
Typ
Max
Unit
Standby Current
IST
-
0.8
1.6
mA
Bias Current
ICC
-
2
4
mA
Conditions
VEN=0V
[Enable]
Hi Level Enable Input Voltage
VENHI
2
-
5.5
V
VENLOW
-0.3
-
+0.8
V
IEN
-
7
10
µA
VEN=3V
Termination Output Voltage
VVTT
VVREF
-30mV
VVREF
VVREF
+30mV
V
IOUT=-1.5A to +1.5A
Ta=0°C to +100 °C (Note 4)
Source Current
IVTT+
1.5
-
-
A
Low Level Enable Input Voltage
Enable Pin Input Current
[Termination]
Sink Current
IVTT-
-
-
-1.5
A
∆VVTT
-
-
40
mV
IOUT=-1.5A to +1.5A
Line Regulation
Reg.l
-
20
40
mV
VCC=4.5V to 5.5V
Upper Side ON-Resistance
RHRON
-
0.4
0.8
Ω
Lower Side ON-Resistance
RLRON
-
0.4
0.8
Ω
ZVDDQ
-
100
-
kΩ
½x
VVDDQ
½x
VVDDQ
20
½ x VVDDQ
+30m
½ x VVDDQ
+40m
-
mA
-10
mA
Load Regulation
[Input of Reference Voltage]
Input Impedance
[Reference voltage]
Output Voltage1
VVREF1
Output Voltage2
VVREF2
Source Current
IVREF+
½ x VVDDQ
-30m
½ x VVDDQ
-40m
10
Sink Current
IVREF-
-
-20
V
IVREF=0mA
V
IVREF=-10mA to +10mA
Ta=0°C to 100°C (Note 4)
[UVLO]
UVLO OFF Voltage
VUVLO
4.2
4.35
4.5
V
Hysteresis Voltage
∆VUVLO
100
160
220
mV
VCC : Sweep up
VCC : Sweep down
(Note 4) No tested on outgoing inspection
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
4/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Typical Waveforms
VVTT(10mV/Div)
VVTT(10mV/Div)
IVTT(1A/Div)
IVTT(1A/Div)
10μsec/Div
10μsec/Div
Figure 2. DDR I
(+1A → -1A)
Figure 1. DDR I
(-1A → +1A)
VVTT(10mV/Div)
VVTT(10mV/Div)
IVTT(1A/Div)
IVTT(1A/Div)
10μsec/Div
10μsec/Div
Figure 4. DDRII
(+1A → -1A)
Figure 3. DDR II
(-1A → +1A)
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Typical Waveforms – continued
VCC
VCC
VEN
VEN
VVDDQ
VVTT_IN
VVDDQ
VVTT_IN
VVTT
VVTT
Figure 6. Input Sequence 2
Figure 5. Input Sequence 1
VVTT_IN
VCC
VEN
VVTT
VVDDQ
VVTT_IN
VVREF
VVTT
IVTT_IN
(1A/div)
Figure 8. Start up Waveform
Figure 7. Input Sequence 3
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
6/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Typical Performance Curves
0.902
Output Voltage : VVREF (V)
VREF(V)
1.251
VREF(V)
Output Voltage : VVREF (V)
1.252
1.25
1.249
0.901
0.9
0.899
0.898
1.248
-10
-5
0
I
(mA)
VREF
IREF(mA)
5
0.897
-10
10
5
10
Figure 10. Output Voltage vs IVREF
(DDR-II)
1.258
Terminal Output Voltage : VVTT (V)
0.912
0.91
1.256
0.910
0.91
0.908
0.90
VTT (V)
1.254
VTT(V)
0
IVREF (mA)
IREF(mA)
Figure 9. Output Voltage vs IVREF
(DDR-I)
Terminal Output Voltage : VVTT (V)
-5
1.252
1.250
1.248
1.246
0.906
0.90
0.904
0.90
0.902
0.90
0.900
0.90
0.898
0.89
0.896
0.89
1.244
-2
-1
0
1
Output Current
:
I
VTT (A)
ITT(A)
-2
2
0
1
2
Output ITT(A)
Current : IVTT (A)
Figure 11. Terminal Output Voltage vs Output Current
(DDR-I)
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
-1
Figure 12. Terminal Output Voltage vs Output Current
(DDR-II)
7/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Application Information
1.
Evaluation Board
■ BD3531F Evaluation Board Circuit
VCC
GND
EN
BD3531F
SW1
2 EN
VTT_IN
7
VDDQ
C5,C6
GND
U1
J2
VDDQ
VTTS
C9
6
C3,C4
VTT
3
5
R4
VCC
VTT_IN
8
VCC
VREF
B
D
3
5
3
VTTS
3
F
J1
C7
C8
C10
VTT
VREF
4
R1
C2
1 GND
C1
■ BD3531F Evaluation Board Application Components
Part No
U1
R1
R4
J1
J2
C1
C2
C3
Value
0.5Ω
220Ω
0Ω
0Ω
2.2µF
10µF
Company
ROHM
ROHM
ROHM
KYOCERA
KYOCERA
Parts Name
BD3531F
MCR03
MCR03
CM105B225K06A
CM21B106M06A
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
Part No
C4
C5
C6
C7
C8
C9
C10
8/15
Value
100µF
2.2µF
220µF
Company
KYOCERA
KYOCERA
SANYO
Parts Name
CM43B107M06A
CM105B225K06A
2R5TPE220MF
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
2.
Power Dissipation
In thermal design, consider the temperature range wherein the IC is guaranteed to operate and apply appropriate
margins. The temperature conditions that need to be considered are listed below:
(1) Ambient temperature Ta: 100°C or lower
(2) Chip junction temperature Tj: 150°C or lower
The chip’s junction temperature Tj can be considered as follows. (See the diagrams below for θja.)
Most heat loss in BD3531F occurs at the output N-channel FET. The lost power is determined by multiplying the
voltage between IN and OUT by the output current. Since this IC is packaged for high-power applications, its thermal
derating characteristics significantly depend on the PCB. So when designing, the size of the PCB to be used should be
carefully considered.
Power dissipation (W) = {Input voltage (VVTT_IN) – Output voltage (VVTT=1/2VVDDQ)} x IOUT (Ave)
For instance, VVTT_IN = 1.8V, VVDDQ=1.8V, and IOUT (Ave)=0.5A
The power dissipation is determined as follows:
Power dissipation W 1.8V 0.9V 0.5A 0.4W
◎SOP8
[W]
0.7
(1) 0.69W
Power Dissipation [Pd]
0.6
0.5
(2) 0.56W
0.4
100°C
0.3
0.2
0.1
0
0
25
50
75
100
125
Ambient Temperature [Ta]
150
[°C]
(1) 70mm x 70mm x 1.6mm Glass-epoxy PCB
θj-c=181°C/W
(2) With no heat sink
θj-a=222°C/W
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
9/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Operational Notes
1.
Reverse Connection of Power Supply
Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when
connecting the power supply, such as mounting an external diode between the power supply and the IC’s power
supply pins.
2.
Power Supply Lines
Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the
digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog
block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and
aging on the capacitance value when using electrolytic capacitors.
3.
Ground Voltage
Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition.
4.
Ground Wiring Pattern
When using both small-signal and large-current ground traces, the two ground traces should be routed separately but
connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal
ground caused by large currents. Also ensure that the ground traces of external components do not cause variations
on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance.
5.
Thermal Consideration
Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in
deterioration of the properties of the chip. In case of exceeding this absolute maximum rating, increase the board size
and copper area to prevent exceeding the Pd rating.
6.
Recommended Operating Conditions
These conditions represent a range within which the expected characteristics of the IC can be approximately
obtained. The electrical characteristics are guaranteed under the conditions of each parameter.
7.
Inrush Current
When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may
flow instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power
supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring,
and routing of connections.
8.
Operation Under Strong Electromagnetic Field
Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction.
9.
Testing on Application Boards
When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may
subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply
should always be turned off completely before connecting or removing it from the test setup during the inspection
process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during
transport and storage.
10. Inter-pin Short and Mounting Errors
Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in
damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin.
Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment)
and unintentional solder bridge deposited in between pins during assembly to name a few.
11. Unused Input Pins
Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and
extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small
charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and
cause unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the
power supply or ground line.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
10/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Operational Notes – continued
12. Regarding the Input Pin of the IC
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them
isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a
parasitic diode or transistor. For example (refer to figure below):
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When GND > Pin B, the P-N junction operates as a parasitic transistor.
Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual
interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to
operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should
be avoided.
Resistor
Transistor (NPN)
Pin A
Pin B
C
E
Pin A
N
P+
P
N
N
P+
N
Pin B
B
Parasitic
Elements
N
P+
N P
N
P+
B
N
C
E
Parasitic
Elements
P Substrate
P Substrate
GND
GND
Parasitic
Elements
GND
Parasitic
Elements
GND
N Region
close-by
Figure 13. Example of monolithic IC structure
13. Thermal Shutdown Circuit(TSD)
This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should always
be within the IC’s power dissipation rating. If however the rating is exceeded for a continued period, the junction
temperature (Tj) will exceed 175°C which will activate the TSD circuit that will turn OFF all output pins. When the Tj
falls below the TSD threshold, the circuits are automatically restored to normal operation.
Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no
circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC from
heat damage.
14. Capacitor Across Output and GND
If a large capacitor is connected between the output pin and ground pin, current from the charged capacitor can flow
into the output pin and may destroy the IC when the VCC or IN pin is shorted to ground or pulled down to 0V. Use a
capacitor smaller than 1000µF between output and ground.
15. Output Capacitor
Do not fail to connect a output capacitor and resister to VREF output terminal for stabilization of output voltage. The
capacitor connected to VREF output terminal works as a loop gain phase compensator. Insufficient capacitance and
resister may cause an oscillation. It is recommended to use a low temperature coefficient 2.2μF ceramic capacitor and
0.5Ω resister though it depends on ambient temperature and load conditions. It is therefore requested to carefully
check under the actual temperature and load conditions to be applied.
16. Output Capacitor
Do not fail to connect a capacitor to VTT output pin for stabilization of output voltage. This output capacitor works as a
loop gain phase compensator and an output voltage variation reducer in the event of sudden change in load.
Insufficient capacitance may cause an oscillation. And if the equivalent series resistance (ESR) of this capacitor is high,
the variation in output voltage increases in the event of sudden change in load. It is recommended to use a 220μF
functional polymer capacitor, though it depends on ambient temperature and load conditions. Using a low ESR ceramic
capacitor may reduce a loop gain phase margin and cause an oscillation, which may be improved by connecting a
resistor in series with the capacitor. It is therefore requested to carefully check under the actual temperature and load
conditions to be applied.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Operational Notes – continued
17. Input Capacitors
These input capacitors are used to reduce the output impedance of power supply to be connected to the input
terminals (VCC and VTT_IN). Increase in the power supply output impedance may result in oscillation or degradation in
ripple rejecting characteristics. It is recommended to use a low temperature coefficient 10μF (for VCC) and 100μF (for
VTT_IN) capacitor, but it depends on the characteristics of the power supply input, and the capacitance and impedance
of the pc board wiring pattern. It is therefore requested to carefully check under the actual temperature and load
conditions to be applied.
18. Input Terminals (VCC, VDDQ, VTT_IN and EN)
VCC, VDDQ, VTT_IN and EN terminals of this IC are made up independent from one another. To VCC terminal, the
UVLO function is provided for malfunction protection. Irrespective of the input order of the inputs terminals, VTT output
is activated to provide the output voltage when UVLO and EN voltages reach the threshold voltage, while VREF output
is activated when UVLO voltage reaches the threshold. If VDDQ and VTT_IN terminals have equal potential and
common impedance, any change in current at VTT_IN terminal may result in variation of VTT_IN voltage, which affects
VDDQ terminal and may cause variation in the output voltage. It is therefore required to perform wiring in such manner
that VDDQ and VTT_IN terminals may not have common impedance. If impossible, take appropriate corrective
measures including suitable CR filter to be inserted between VDDQ and VTT_IN terminals.
19. VTTS Terminal
This terminal is used to improve load regulation of VTT output. The connection with VTT terminal must be done so that
it would not have a common impedance with high current line for better load regulation of VTT output.
20. Operating Range
Within the operating range, the operation and function of the circuits are generally guaranteed at an ambient
temperature within the range specified. The values specified for electrical characteristics may not be guaranteed, but
drastic change may not occur to such characteristics within the operating range.
21. Built-in thermal Shutdown Protection Circuit
Thermal shutdown protection circuit is built-in to prevent thermal breakdown. Turns VTT output to OFF when the
thermal shutdown protection circuit activates. This thermal shutdown protection circuit is originally intended to protect
the IC itself. It is therefore requested to conduct a thermal design not to exceed the temperature under which the
thermal shutdown protection circuit can work.
22. In the event that load containing a large inductance component is
connected to the output terminal, and generation of back-EMF at the
start-up and when output is turned OFF is assumed, it is requested
to insert a protection diode.
(Example)
OUTPUT PIN
23. Application Circuit
Although we can recommend the application circuits contained herein with a relatively high degree of
confidence, we ask that you verify all characteristics and specifications of the circuit as well as its
performance under actual conditions. Please note that we cannot be held responsible for problems that may
arise due to patent infringements or noncompliance with any and all applicable laws and regulations.
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
12/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Ordering Information
B
D
3
5
3
1
Part Number
F
-
Package
F : SOP8
E2
Packaging and forming specification
E2: Emboss tape reel opposite draw-out side: 1 pin
Marking Diagram
SOP8 (TOP VIEW)
Part Number Marking
D
3
5
3
1
LOT Number
1PIN MARK
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
13/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Physical Dimension Tape and Reel Information
Package Name
SOP8
(Max 5.35 (include.BURR))
(UNIT : mm)
PKG : SOP8
Drawing No. : EX112-5001-1
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
14/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
BD3531F
Revision History
Date
Revision
02.Nov.2015
001
Changes
New Release
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
15/15
TSZ02201-0J2J0A900950-1-2
02.Nov.2015 Rev.001
Datasheet
Notice
Precaution on using ROHM Products
1.
Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
(Note 1)
, transport
intend to use our Products in devices requiring extremely high reliability (such as medical equipment
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ
2.
ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor
products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which
a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3.
Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
special or extraordinary environments or conditions. If you intend to use our Products under any special or
extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
[c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2,
H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
[e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items
[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4.
The Products are not subject to radiation-proof design.
5.
Please verify and confirm characteristics of the final or mounted products in using the Products.
6.
In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7.
De-rate Power Dissipation depending on ambient temperature. When used in sealed area, confirm that it is the use in
the range that does not exceed the maximum junction temperature.
8.
Confirm that operation temperature is within the specified range described in the product specification.
9.
ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1.
When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2.
In principle, the reflow soldering method must be used on a surface-mount products, the flow soldering method must
be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products,
please consult with the ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice-PGA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
Precautions Regarding Application Examples and External Circuits
1.
If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2.
You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1.
Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2.
Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3.
Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4.
Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
Precaution for Product Label
QR code printed on ROHM Products label is for ROHM’s internal use only.
Precaution for Disposition
When disposing Products please dispose them properly using an authorized industry waste company.
Precaution for Foreign Exchange and Foreign Trade act
Since concerned goods might be fallen under listed items of export control prescribed by Foreign exchange and Foreign
trade act, please consult with ROHM in case of export.
Precaution Regarding Intellectual Property Rights
1.
All information and data including but not limited to application example contained in this document is for reference
only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any
other rights of any third party regarding such information or data.
2.
ROHM shall not have any obligations where the claims, actions or demands arising from the combination of the
Products with other articles such as components, circuits, systems or external equipment (including software).
3.
No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any
third parties with respect to the Products or the information contained in this document. Provided, however, that ROHM
will not assert its intellectual property rights or other rights against you or your customers to the extent necessary to
manufacture or sell products containing the Products, subject to the terms and conditions herein.
Other Precaution
1.
This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2.
The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written
consent of ROHM.
3.
In no event shall you use in any way whatsoever the Products and the related technical information contained in the
Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4.
The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice-PGA-E
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3.
The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
© 2015 ROHM Co., Ltd. All rights reserved.
Rev.001
工商网监
湘ICP备2023018690号
