○Product structure：Silicon monolithic integrated circuit ○This product has no designed protection against radioactive rays
. 1/17
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
TSZ22111・14・001
www.rohm.com
3.0V to 30V Input 1ch
Buck Controller
BD63536FJ
General Description
The BD63536FJ is a gate direct drive switching
regulator operating at a power supply voltage from 3V
to 30V. This regulator uses a compact package SOP-J8
and operates as a switching regulator for the voltage
control type of step-down DC/DC converter. The
regulator features reliable design with 1% reference
voltage accuracy, built-in current limit function (4%),
and a variety of built-in protection circuits.
Features
Gate Direct Drive Available (External Pch FET,
VCC-5.4V)
Built-in Current Limit Function (150mV4%)
Built-in Gate-off Function
Built-in Soft Start
2.5V Regulator Output Voltage
Variable External Oscillation Frequency
Built-in Thermal Shutdown Circuit
Applications
Laser Beam Printers, MFPs, PPCs, etc.
Key Specifications
Power Supply Voltage Range: 3.0V to 30V
Error Amplifier Reference Voltage: 1.25V1%
Output Current (Peak): 200mA(Max)
Oscillation Frequency: 300kHz(Max)
Operating Temperature Range: -25°C to +85°C
Package W(Typ) x D(Typ) x H(Max)
Typical Application Circuit
SOP-J8
4.90mm x 6.00mm x 1.65mm
Figure 1. Typical Application Circuit
VREG
UVLO
TSD
OVP
OSC
COMP
Soft Start
Controller
COMP
C.L.
VCC
CS
GATE
VIN
GND
FB
IN-
OSC
VREF
OFF
GATE
RFB1
RFB2
1.25v
R
C
GATEOFF、OVP
TSD、UVLO
Datashee
t
2/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Pin Configuration
Pin Descriptions
Block Diagram
Pin No.
Pin Name
Function
1
OSC
PWM frequency setting
2
VREF
2.5V regulator output
3
FB
Error amplifier output
4
IN-
Error amplifier input
5
GATE
Gate output
6
CS
Current limit input
7
VCC
Power supply
8
GND
Ground
SOP-J8
(TOP VIEW)
TOP VIEW
OSC
VREF
IN-
GATE
VCC
GND
FB
CS
C.L.
OFF
VREG
UVLO
TSD
OVP
OSC
COMP
Soft Start
Controller
COMP
VCC
CS
GATE
GND
FB
IN-
OSC
VREF
GATE
GATEOFF
3/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Absolute Maximum Rating (Ta25C)
Parameter
Symbol
Rating
Unit
Power Supply Voltage
VCC
-0.2 to +32.0
V
Current Detection Pin
VCS
-0.2 to +32.0
V
VCC-VCS Potential Difference
VCC-VCS
-0.2 to +5.0
V
Output Current (DC)
IOUT
30 (Note 1)
mA
Output Current (peak)
IOUTPEAK
200 (Note 2)
mA
Power Dissipation 1
Pd1
0.56 (Note 3)
W
Power Dissipation 2
Pd2
0.67 (Note 4)
W
Operating Temperature Range
Topr
-25 to +85
°C
Storage Temperature Range
Tstg
-55 to +150
°C
Junction Temperature
Tjmax
150
°C
(Note 1) Should not exceed Pd value.
(Note 2) Should not exceed Pd value when Pulse width tw100µs and Duty50%.
(Note 3) When using the IC alone. Derate power rating by 4.5mW/C when IC is used at Ta above 25C.
(Note 4) When mounted on a glass epoxy of 70 mm x 70 mm x 1.6 mm. Derate power rating by 5.4mW/C when IC is used at Ta above 25C.
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 to +85°C)
Parameter
Symbol
Rating
Unit
Min
Typ
Max
Power Supply Voltage
VCC
3
24
30
V
Oscillation Frequency
fOSC
-
-
300
kHz
Electrical Characteristics (Unless otherwise specified, Ta25C, VCC24V)
Parameter
Symbol
Limit
Unit
Conditions
Min
Typ
Max
General
Circuit Current
ICC
-
2
4
mA
VOSC=0V
Current Limit Block
Switching Voltage
VCL
VCC-0.156
VCC-0.150
VCC-0.144
V
VCS: Sweep Down
Output OFF Switching Voltage
VOOFF
VCC-1.3
VCC-1.0
VCC-0.7
V
VCS: Sweep Down
CS Input Bias Current
ICS
-
0.3
1.0
µA
VCS=VCC
Output Block
GATE H Voltage
VONH
VCC-0.10
VCC-0.05
-
V
IGATE= -10mA
GATE L Voltage
VONL
VCC-6.20
VCC-5.40
VCC-4.60
V
IGATE=10mA
Reference Voltage Block
VREF Output Voltage
VREF
2.375
2.500
2.625
V
IVREF= -0.1mA
Low Input Malfunction Prevention Circuit Block
Threshold Voltage
VUVLO
2.3
2.5
2.7
V
VCC: Sweep Up
Hysteresis Voltage
∆VUVLO
0.05
0.15
0.25
V
Triangular Waveform Oscillator Block
Oscillation H Voltage
VOSH
1.26
1.40
1.54
V
VOSC: Sweep Up
Oscillation L Voltage
VOSL
0.9
1.0
1.1
V
VOSC: Sweep Down
Error Amplifier Block
Input Bias Current
IIN-
-0.3
-0.1
-
µA
VIN-=0V
Reference Voltage
VIN-
1.237
1.250
1.263
V
VFB=VIN-
Feedback H Voltage
VFBH
1.6
1.9
-
V
IFB=-100µA
Feedback L Voltage
VFBL
-
0.6
0.9
V
IFB=100µA
Reference Characteristics (Unless otherwise specified, Ta25C, VCC 3V)
Parameter
Symbol
Reference Value
Unit
Conditions
Min
Typ
Max
Output Block
GATE H Voltage
VONH
VCC-0.02
VCC-0.01
-
V
IGATE= -1mA
GATE L Voltage
VONL
-
0.075
0.150
V
IGATE=1mA
(Note) “” sign for current value represents the direction in which the current flows out from the IC.
GATE switching waveform:
Below 200mA
Below 100µs
Duty50%
4/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Typical Performance Curves
(Unless otherwise specified, Ta25C, VCC 24V)
Figure 2. Circuit Current vs Power Supply Voltage
Figure 3. CS Bias Current vs Power Supply Current
0
0.1
0.2
0.3
0.4
0.5
0 4 8 12 16 20 24 28 32
Vcc : [V]
CS bias Current [uA]
CS Bias Current : ICS [µA]
Power Supply Voltage : VCC [V]
Figure 2. Gate H Voltage vs Output Current
(Output Block)
15
16
17
18
19
20
21
22
23
24
25
0 5 10 15 20 25 30
Output Current : IGATE [mA]
Output VONH [V]
Gate H Voltage : VONH [V]
Output Current : IGATE [mA]
Figure 5. Gate L Voltage vs Input Current
(Output Block)
15
16
17
18
19
20
21
22
23
24
25
0 5 10 15 20 25 30
Input Current : IGATE [mA]
Output VONL [V]
Gate L Voltage : VONL [V]
Circuit Current : ICC [mA]
Power Supply Voltage : VCC [V]
0.0
1.0
2.0
3.0
4.0
5.0
0
4
8
12
16
20
24
28
32
5/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Typical Performance Curves - continued
(Unless otherwise specified, Ta25C, VCC 24V)
Figure 6. Gate H Voltage vs Power Supply Voltage
(Output Block)
Figure 9. Reference Voltage vs Temperature
(Error Amplifier Block)
Figure 8. Reference Voltage vs Power Supply Voltage
(Error Amplifier Block)
Reference Voltage
0
5
10
15
20
25
30
35
3 6 9 12 15 18 21 24 27 30
VCC : [V]
Output VONH [V]
Gate H Voltage : VONH [V]
Power Supply Voltage : VCC [V]
Figure 7. Gate L Voltage vs Power Supply Voltage
(Output Block)
0
5
10
15
20
25
30
35
3 6 9 12 15 18 21 24 27 30
VCC : [V]
Output VONL[V]
Gate L Voltage : VONL [V]
Power Supply Voltage : VCC [V]
0
0.3
0.6
0.9
1.2
1.5
0 4 8 12 16 20 24 28 32
VCC : [V]
基準電圧VIN-(IN-=FB)[V]
Reference Voltage
Power Supply Voltage : VCC [V]
Reference Voltage : VIN-(IN-=FB) [V]
0
0.3
0.6
0.9
1.2
1.5
-25 0 25 50 75
Temperature : Ta [℃]
基準電圧VIN-(IN-=FB)[V]
Reference Voltage : VIN-(IN-=FB) [V]
Temperature : Ta [°C]
6/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Typical Performance Curves - continued
(Unless otherwise specified, Ta25C, VCC 24V)
Figure 10. Feedback H Voltage vs Feedback Current
Figure 11. Feedback L Voltage vs Feedback Current
0.0
0.5
1.0
1.5
2.0
2.5
0100 200 300 400 500
Output Current : IFB [uA]
Output : FB_H [V]
Feedback H Voltage : VFBH [V]
Feedback Current : IFB [µA]
0.0
0.5
1.0
1.5
2.0
2.5
0100 200 300 400 500
Input Current : IFB [uA]
Output : HB_L [V]
Feedback L Voltage : VFBL [V]
Feedback Current : IFB [µA]
Figure 12. Reference Voltage vs Power Supply Voltage
(Reference Voltage Block)
0.0
1.0
2.0
3.0
0 4 8 12 16 20 24 28 32
VCC : [V]
VREF [V]
Power Supply Voltage : VCC [V]
Reference Voltage : vREF [v]
Figure 13. Reference Voltage vs Output Current
(Reference Voltage Block)
0.0
1.0
2.0
3.0
0 0.25 0.5 0.75 1
Output Current : IREF [mA]
VREF [V]
Reference Voltage : vREF [v]
7/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Application Information
Figure 14. Block diagram and typical application circuit
1. Description of Pins and Functions
(1) VCC: Power Supply Pin
To apply large drive currents, the wiring should be thick, short, and should have low impedance. Also when it comes
to PWM switching noise, the current must be adjusted carefully so that VCC voltage will be stable. It is also possible
to connect laminated ceramic capacitors at approximately 0.01µF to 0.1µF in parallel to reduce power supply
impedance in a broad frequency band. For the VCC voltage, extra care is needed so that it will not exceed its rating
even for a moment. The VCC pin has a built-in clamp element for electrostatic breakdown protection. If a sudden
pulse signal or voltage such as a surge exceeding the absolute maximum rating is applied, this clamp element may
be activated and may lead to breakdown. To avoid this, NEVER exceed the absolute maximum rating. It is also
effective to mount a zener diode having a rating approximately equal to the absolute maximum rating. In addition,
note that since a diode for electrostatic breakdown protection is inserted between the VCC pin and the GND pin, if an
inverse voltage is applied to the VCC pin and the GND pin, the IC maybe led to breakdown.
(2) GND: Ground Pin
In order to reduce noise due to switching current and stabilize the internal reference voltage of the IC, minimize the
wiring impedance from this pin and maintain the potential at the minimum level in any operating state. In addition,
design wiring patterns so that the pin has no common impedance to other GND patterns.
(3) VREF: 2.5V Regulator Output Pin
The VREF pin is connected to the internal reference voltage 2.5V (Typ) which is generated from the power supply
voltage input to the VCC pin. In order to stabilize the power supply, be sure to connect a 0.1µF capacitor to this pin.
This pin is also used as a bias. For this application, set a load current of approximately 1mA or less. In addition, note
that grounding this pin may pass a large current through the IC which may cause breakdown.
(4) FB: Error Amplifier Output Pin
The FB pin is an output pin of the feedback error amplifier.
(5) IN-: Error Amplifier Input Pin
The IN- pin is an input pin of the feedback error amplifier.
VREG
UVLO
TSD
OVP
OSC
COMP
Soft Start
Controller
COMP
C.L.
VCC
CS
GATE
VIN
GND
FB
IN-
OSC
VREF
OFF
GATE
GATEOFF
An external resistor and capacitor of
filter used to determine frequency
characteristics
A decoupling capacitor.
It is recommended to set this capacitor
to 10µF to 100µF for electrolytic
capacitors or 0.01µF to 0.1µF for
laminated ceramic capacitors.
A resistor used to
detect current. It is
recommended to set
this resistor to 0 to
0.3.
A resistor used to
monitor voltage
detection
A smoothing LC filter
A resistor and capacitor used to
make oscillation frequency
setting. It is recommended to
set the resistor to 20k to 100k
and the capacitor to 100pF to
10nF.
Reference voltage output.
Connect a capacitor of 0.1µF to
this pin.
An external
resistor and
capacitor of
filter used to
determine
frequency
characteristic
s
8/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
(6) GATE: External FET Drive Pin
The GATE pin is used to drive the external FET gate. Since output H voltage is “VCC voltage 0.05V (typ)” and
output L voltage is “VCC voltage 5.4V (typ)”, the pin is able to directly drive the external FET gate. Provide thick,
short and low impedance wiring from this pin. The GATE pin has a built-in clamp element for electrostatic breakdown
protection. If a sudden pulse signal or voltage such as a surge exceeding the absolute maximum rating is applied,
this clamp element may be activated and may lead to breakdown. To avoid this, NEVER exceed the absolute
maximum rating. It is also possible to adjust the switching rate by mounting a resistor between the GATE pin and the
external FET. In addition, note that the GATE pin is designed to connect the internal regulator to the CMOS output, so
if the voltage between the VCC pin and the GATE pin causes a significant difference because of poor grounding, the
IC may lead to breakdown.
(7) OSC: PWM Oscillation Frequency Setting Capacitance Connection Pin
The OSC pin is used to produce a triangular waveform, which is used to generate the PWM oscillation frequency, by
connecting an external resistor and a capacitor to this pin. These external resistor and capacitor perform charge and
discharge. Since H level for a triangular waveform is 1.4V (typ) and L level is 1.0V (typ), the triangular waveform
produced has an amplitude of OSC0.4V (typ). The external resistor determines the charge current and an internal
resistance of 5kΩ(typ) determines the discharge current. However, pay careful attention to operate the IC at high
frequencies in the range of several hundred kHz because OSC amplitude may exceed 0.4V (typ) due to the delay in
the internal circuit. The following section shows the characteristics table of oscillation frequency vs capacitance when
the external resistor is set to 30kΩ. For example, when the capacitor is set to 1000pF, the frequency “f” will be 91
[kHz].
Figure 15. Typical Oscillation Frequency Characteristics
The formula below is used to calculate the oscillation frequency setting:
Note that the formula shown above is used for calculations of oscillation frequency when the ranges of capacitor and
resistor are 470pF to 2200pF and 30kΩ to 100kΩ, respectively. In application boards, oscillation frequencies may be
influenced by wiring capacitance or the capacity of an oscilloscope used to monitor the frequencies. These may cause
errors so the calculated values may become different from the actual values. Use this formula as a guide for setting
the oscillation frequency.
OSC周波数Capa特性
1
10
100
1000
10 100 1000 10000 100000
容量値[pF]
周波数[KHz]
R=30KΩ
Frequency [KHz]
Capacitance [pF]
Oscillation Frequency vs. Capacitance Characteristics
72)198031.0( 1
eRC
f
9/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
(8) CS: Current Detection Comparator Input Pin
The CS pin is an input of the overcurrent detection circuit comparator. This IC has a built-in overcurrent detection
circuit (current limit function) used to turn OFF the output current if an abnormal overcurrent, such as short-circuited
output current, flows through the IC. This IC monitors the current passing through the external FET through
components such as the current-sense resistor, which is connected to the CS pin. When a voltage input to the CS pin
reaches “VCC voltage 0.15V (typ)”, the current limit function will be activated. Also, when it reaches the current limit
voltage, the CS pin will turn OFF the output current according to the set resistance and current values. The CS pin is
of the automatic resetting type so it will be automatically reset when the OSC pin reaches its peak voltage. The CS
pin is reset at the peak voltage of the OSC pin and when the voltage reaches the set current limit voltage, it resets at
the same peak voltage again. Then, the CS pin repeats the reset cycle. Since superimposing noises into this pin may
cause malfunctions, masking time of approximately 300ns has been internally set. In addition, it is possible to prevent
noise from entering into the CS pin by adding a capacitor to this pin. If the IC is controlled at a duty cycle of 700ns or
less, the current limit function will not be activated since the delay time of approximately 700ns including the said
masking time of approximately 300ns is provided after the current limit reaches the GATE pin. Normally, no current
setting seems to be made to the extent that the CS pin reaches the current limit voltage in the period of
approximately 700ns. However, pay utmost attention to the current setting because it also depends on the external
FET. To disable overcurrent detection circuit, short the CS pin to the VCC pin. If a current exceeds the absolute
maximum rating of the CS pin, the IC may break down. To avoid this, pay utmost attention to the current.
The current for the current limit function is set to “0.15V ÷ Resistance”. For example, when resistance is 75mΩ, the
set current for the current limit function is “2A”.
Figure 16. Current Limit Operation
If a voltage input to the CS pin falls below “VCC voltage 1V (typ)”, the gate-off function will be activated to turn OFF
the output current. When the CS pin exceeds the voltage of “VCC voltage 1V (typ)”, the output current will be reset
by the soft start function.
(9) Soft Start
This IC has a built-in soft start function. This function is used to generate a clock, which is in sync with the internal
oscillator, and operate the internal 6 bit DAC with this clock. Soft start time depends on the oscillation frequency.
Taking a reference clock frequency that is 8 times higher than the oscillation frequency, it will raise the output voltage
at a rate of 40mV/count. The output voltage will reach 1.25V at approximately 32 counts. For example, when
oscillation frequency fOSC is set to 100 kHz, a period of time required to raise the voltage from 0V to 1.25V is
approximately 2.56ms (10µs x 8 x 32 counts).
Enlargement of internal clock generation
Figure 17. Soft Start Operation
Soft start signal
Internal clock
UVLO
OSC
OSC
CS
GATE
10/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
2. Protection Circuits
(1) Thermal Shutdown (TSD) Circuit
This IC has a built-in thermal shutdown (TSD) circuit as overheat protection. When the IC chip temperature exceeds
175C (typ), GATE output will be turned OFF. When the temperature falls below 155C (typ), the IC will return to its
normal operation. In this case, the normal operation starts up in the soft start sequence. However, if external heat is
continually applied to the IC even when the TSD circuit is in operation, thermal runaway may happen which will result
to breakdown.
(2) Over-current Protection Circuit (Current Limit Function)
This IC has a built-in overcurrent protection circuit. This circuit is absolutely intended to protect the IC from
breakdown due to overcurrent during an abnormal state such as output short circuit. This overcurrent protection
circuit, which is incorporated in the IC, does not guarantee protection of the application set. Do not use this function
of the IC in the design of the protection of the sets. For practical use, take physical safety measures such as use of
fuses.
(3) Under Voltage Lockout (UVLO) Function
This IC has a built-in Under Voltage Lockout circuit to prevent malfunctions at low power supply voltages. If the power
supply voltage falls below the operating voltage range, the UVLO function will be activated. On the other hand, if a
voltage applied to the VCC pin reaches 2.35V (typ), the UVLO function will turn OFF the Gate output once. The
switching voltage is provided with hysteresis of approximately 0.15V (typ) to prevent malfunctions such as noise. If
the UVLO function is cleared, the IC will start up in the soft start sequence.
(4) Overvoltage Protection (OVP) Function
This IC has a built-in overvoltage protection function as a protection circuit for a rise in power supply voltage. If power
supply voltage exceeds the absolute maximum rating, this OVP function will be activated. However, if a voltage
applied to the VCC pin exceeds 33.5V (typ), the OVP function will turn OFF the Gate output once. The switching
voltage is provided with hysteresis of approximately 1V (typ) to prevent malfunctions such as noises. If the OVP
function is reset, the IC will start up in the soft start sequence.
3. Switching Regulator Control
Figure 18 shows the basic configuration of a switching regulator application. The error amplifier determines an output
duty cycle so that a voltage used to monitor output voltage will become equal to the internal reference voltage. The output
driver switches frequency at the said duty cycle, smoothes the switching voltage through the LC filter, and outputs VOUT.
This IC has an internal reference voltage of 1.25V (typ) and a recommended output voltage range of 3.3V to 5V. Note that
if the output voltage is set to below 3.3V, for example to 1.25V, the output switching duty cycle may become too narrow to
disable the current limit setting, depending on oscillation frequency to be used.
Figure 18. Switching Regulator Block Diagram
VREG
UVLO
TSD
OVP
OSC
COMP
Soft Start
Controller
COMP
C.L.
Vcc
CS
GATE
VIN
GND
FB
IN-
OSC
VREF
OFF
GATE
GATEOFF
OVP
TSD
UVLO
11/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
4. Typical Filter Circuit
When considering a filter circuit for the determination of the phase characteristics with the application of this IC, the three
configurations shown in Figure 19 below are the popular configurations of the filter circuits. The selection of the
configuration to be used is determined by the relationship between the PWM frequency to be used and the second pole
of LC filter, the zero point at ESR of output capacitor, and the ripple elimination rate at the PWM switching frequency to
be used.
(a) Filter Example 1 (b) Filter Example 2 (c) Filter Example 3
Figure 19. Examples of Filter Circuits Used to Determine Phase Characteristics
The circuit (a) is the simplest configuration and can be used if the output capacitor has high ESR.
The circuit (b) is a configuration designed by adding a capacitor to the configuration of (a) and can be used if the output
capacitor has high ESR and the voltage ripple elimination rate at the PMW frequency needs to be increased from that of
the configuration of (a).
The circuit (c) is a configuration designed by adding two zero-points and can be used even if the output capacitor has
small ESR.
Select the circuit configuration according to the required specifications and situations for inductors, capacitors, and PWM
frequency.
5. Typical Application Design
The following section shows a typical application design.
Figure 20. Typical Application Design
VIN
RFB1
RFB2
R2
C0
VOUT
VIN
RFB1
RFB2
C0
R2
C1
VOUT
VOUT
RFB1
RFB2
R2
C0
R1
C1
CF
VREG
UVLO
TSD
OVP
OSC
COMP
Soft Start
Controller
COMP
C.L.
VCC
CS
GATE
VIN
GND
FB
IN-
OSC
VREF
OFF
GATE
Rfb1
Rfb2
1.25V
R
C
GATEOFF, OVP
TSD, UVLO
RFB2
RFB1
12/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
I/O Equivalent Circuits
CS
200Ω
200Ω
VCC
VREF
50kΩ
50kΩ
VCC
OSC
200Ω
200Ω
5kΩ
VREF
VCC
IN-
1kΩ
VREF
FB
VCC
10Ω
VREF
VCC
GATE
13/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
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.
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BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Operational Notes – continued
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.
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.
Figure 21. 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 rise 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.
TSD ON temperature [°C] (typ)
Hysteresis temperature [°C] (typ)
175
25
14. Transient changes
In this IC, the GATE pin L voltage is set to “VCC voltage 5.4V (typ)” with the internal regulator of the IC. If output
makes a sudden change due to high switching speed, the voltage can cause transient deviation in excess of “VCC
voltage 6.2V (max)”. To avoid this and also protect between the gate and the source of external MOSFET, it is
recommended to insert and clamp a proper zener diode between the GATE pin and the power supply pin.
N N
P+PN N
P+
P Substrate
GND
NP+N N
P+
NP
P Substrate
GND GND
Parasitic
Elements
Pin A
Pin A
Pin B Pin B
B C
EParasitic
Elements
GND
Parasitic
Elements
CB
E
Transistor (NPN)Resistor
N Region
close-by
Parasitic
Elements
15/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Ordering Information
B
D
6
3
5
3
6
F
J
-
E 2
Part Number
Package
FJ : SOP-J8
Packaging and forming specification
E2: Embossed tape and reel
Marking Diagram
SOP-J8 (TOP VIEW)
63536
Part Number Marking
LOT Number
1PIN MARK
16/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Physical Dimension, Tape and Reel Information
Package Name
SOP-J8
17/17
BD63536FJ
TSZ02201-0P2P0AJ00850-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
23.Oct.2014 Rev.001
www.rohm.com
TSZ22111・15・001
Revision History
Date
Revision
Changes
23.Oct.2014
001
New Release
Notice-GE Rev.003
© 2013 ROHM Co., Ltd. All rights reserved.
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
intend to use our Products in devices requiring extremely high reliability (such as medical equipment (Note 1), transport
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
CLASSⅢ
CLASSⅡb
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 (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient 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-GE Rev.003
© 2013 ROHM Co., Ltd. All rights reserved.
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 our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act,
please consult with ROHM representative 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. ROHM shall not be in any way responsible or liable
for infringement of any intellectual property rights or other damages arising from use of such information or data.:
2. 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 information contained in this document.
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.
DatasheetDatasheet
Notice – WE Rev.001
© 2014 ROHM Co., Ltd. All rights reserved.
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.
