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BD9673EFJ 데이터시트 PDF




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부품번호 BD9673EFJ 기능
기능 Step-down Switching Regulator
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BD9673EFJ 데이터시트, 핀배열, 회로
Single-chip Type with Built-in FET Switching Regulators
Flexible Step-down
Switching Regulator
with Built-in Power MOSFET
BD9673EFJ
No.11027EBT57
Description
Output 1.5A and below High Efficiency Rate Step-down Switching Regulator Power MOSFET Internal Type BD9673EFJ
mainly used as secondary side Power supply, for example from fixed Power supply of 12V, 24V etc, Step-down Output of
1.2V/1.8V/3.3V/5V, etc, can be produced. This IC has external Coil/Capacitor down-sizing through 300 kHz Frequency
operation, inside Nch-FET SW for 45V “withstand-pressure” commutation and also, high speed load response through
Current Mode Control is a simple external setting phase compensation system, through a wide range external constant, a
compact Power supply can be produced easily.
Features
1) Internal 200 mNch MOSFET
2) Output Current 1.5A
3) Oscillation Frequency 300kHz
4) Synchronizes to External Clock ( 200kHz500kHz )
5) Feedback Voltage 1.0V±1.0%
6) Internal Soft Start Function
7) Internal Over Current Protect Circuit, Low Input Error Prevention Circuit, Heat Protect Circuit
8) ON/OFF Control through EN Pin (Standby Current 0 A Typ.)
9) Package: HTSOP-J8 Package
Applications
For Household machines in general that have 12V/24V Lines, etc.
Absolute Maximum Rating
Parameter
Symbol
Ratings
Unit
VCC-GND Supply Voltage
VCC
45
V
BST-GND Voltage
VBST
50
V
BST-Lx Voltage
VBST
7
V
EN-GND Voltage
VEN
45
V
Lx-GND Voltage
VLX 45 V
FB-GND Voltage
VFB 7 V
VC-GND Voltage
VC 7 V
SYNC-GND Voltage
SYNC
7
V
High-side FET Drain Current
IDH
2.0
A
Power Dissipation
Pd
3.76(*1)
W
Operating Temperature
Topr -40+105
Storage Temperature
Tstg -55+150
Junction Temperature
Tjmax
+150
(*1)During mounting of 70×70×1.6t mm 4layer board (Copper area:70mm×70mm).Reduce by 30.08mW for every 1increase. (Above 25)
Operating Conditions (Ta=25)
Parameter
Power Supply Voltage
Output Voltage
(*2)Restricted by minimum on pulse typ. 200ns
Symbol
VCC
VOUT
Min.
7
1.0(*2)
Ratings
Typ.
Max.
42
VCC×0.7
Unit
V
V
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
1/16
2011.07 - Rev.B
Free Datasheet http://www.nDatasheet.com




BD9673EFJ pdf, 반도체, 판매, 대치품
BD9673EFJ
Technical Note
Block Description
1. Reference
This block generates Error Amp standard voltage.
Standard voltage is 1.0V.
2. REG
This is a Gate Drive Voltage Generator and 5V Low saturation regulator for internal circuit power supply.
3. OSC
This is a precise wave oscillation circuit with operation frequency fixed to 300 kHz fixed (self-running mode).
To implement the synchronization feature connect a square wave (Hi Level: higher than 2V, Low Level: lower than
0.8V )to the SYNC pin. The synchronization frequency range is 200 kHz to 500 kHz. After connecting the rising edge of
LX will be synchronized to the falling edge of SYNC pin signal after 3 counts. At the synchronization remove the
external clock, the device transitions self-running mode after 7 microseconds.
4. Soft Start
A circuit that does soft start to the output voltage of DC/DC comparator, and prevents rush current during start-up.
Soft start time is set at IC internal, after 10 ms from starting-up EN pin, standard voltage comes to 1.0V, and output
voltage becomes set voltage.
5. ERROR AMP
This is an Error amplifier what detects output signal, and outputs PWM control signal.
Internal Standard Voltage is set to 1.0V.
Also, C and R are connected between the output (VC) pin GND of Error Amp as Phase compensation elements.
(See p.11)
6. ICOMP
This is a Voltage-Pulse Width Converter that controls output voltage in response to input voltage.
This compares the Voltage added to the internal SLOPE waveform in response to the FET WS current with Error
amplifier output voltage, controls the width of output Pulse and outputs to driver.
7. Nch FET SW
This is an internal commutation SW that converts Coil Current of DC/DC Comparator.
It contains 45V” with stand pressure” 200mSW.
Because the Current Rating of this FET is 2.0A included ripple current, please use at within 2.0A.
The device has the circuit of over current protection for protecting the FET from over current.
To detect OCP 2 times sequentially, the device will stop and after 13msec restart.
8. UVLO
This is a Low Voltage Error Prevention Circuit.
This prevents internal circuit error during increase of power supply voltage and during decline of power supply voltage.
It monitors VCC pin voltage and internal REG voltage, and when VCC voltage becomes 6.4V and below, it turns off all
output FET and turns off DC/DC comparator output and soft start circuit resets.
Now this threshold has hysteresis of 200mV.
9. TSD
This is a Heat Protect (Temperature Protect) Circuit.
When it detects an abnormal temperature exceeding Maximum Junction Temperature (Tj=150), it turns off all output
FET, and turns off DC/DC comparator output. When Temperature falls, it has/with hysteresis and automatically returns.
10. EN
With the Voltage applied to EN Pin (6pin), IC ON/OFF can be controlled.
When a Voltage of 2.0V or more is applied, it turns on, at open or 0V application, it turns off.
About 550 kpull-down resistance is contained within the pin.
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
4/16
2011.07 - Rev.B
Free Datasheet http://www.nDatasheet.com

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BD9673EFJ 전자부품, 판매, 대치품
BD9673EFJ
Technical Note
16
14
12
10
8
VCC=12V
6 VCC=24V
4 VCC=36V
2
VCC=42V
0
-60 -40 -20 0 20 40 60 80 100 120
Temp[]
Fig.14. Soft Start Time
Temperature Characteristics
300
250
200
150
100
50
0
-60 -40 -20
0 20 40 60
Temp[]
80 100 120
Fig.15. Nch FET ON Resistance
Temperature Characteristics
20
15
10
5
0
-60 -40 -20
0 20 40 60
Temp[]
80 100 120
Fig.16. Pre-charge FET ON Resistance
Temperature Characteristics
6
5
4
3
VCC=12V
2 VCC=24V
VCC=36VVCC=42V
1
0
-60 -40 -20
0 20 40 60
Temp[]
80 100 120
Fig.17. OCP Detect Current
Temperature Characteristics
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-60 -40 -20 0 20 40 60 80 100 120
Temp[]
Fig.18. VC to SW current transconductance
Temperature characteristics
2
1.5
1
0.5
0
-60 -40 -20
0 20 40 60
Temp[]
80 100 120
Fig.19. EN Threshold Temperature
Characteristics
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
7/16
2011.07 - Rev.B
Free Datasheet http://www.nDatasheet.com

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부품번호상세설명 및 기능제조사
BD9673EFJ

Flexible Step-down Switching Regulator

ROHM Semiconductor
ROHM Semiconductor
BD9673EFJ

Step-down Switching Regulator

ROHM Semiconductor
ROHM Semiconductor

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