Datasheet
12V to 76V input voltage range 3A output current
1ch Buck Converter Integrated FET
BD9G341AEFJ-LB
General Description
This is the product guarantees long time support in
Industrial market.
The BD9G341AEFJ-LB is a buck switching regulator
with integrated 150mΩ power MOSFET. Current mode
architecture provides fast transient response and a
simple phase compensation setup. The operating
frequency is programmable from 50kHz to 750kHz.
Additional protection features are included such as
Over Current Protection, Thermal shutdown and Under
voltage lockout. The
under voltage lockout and
hysteresis can be set by external resistor .
Key specifications
■
Input voltage
■
Ref voltage(Ta=25°C)
(Ta=-40 to 85°C)
■
Max output current
■
Operating Temperature
■
Max junction temperature
12 to 76[V]
±1.5[%]
±2.0[%]
3 [A] (Max.)
-40°C to 85°C
150°C
Package(s)
HTSOP-J8
4.90mm x 6.00mm x 1.00mm
Features
Long Time Support Product for Industrial
Applications
Wide input voltage range from 12V to 76V.
Integrated 80V/3.5A/150mΩ NchFET.
Current mode.
Variable frequency from 50kHz to 750kHz.
Accurate reference voltage.( 1.0 V±1.5 %).
Precision ENUVLO threshold ( ±3%).
Soft-start function
0uA Standby current
Over Current Protection (OCP), Under Voltage
Lockout(UVLO), Thermal-Shutdown(TSD),Over
Voltage Protection (OVP)
Thermally enhanced HTSOP-J8 package
Applications
Industrial distributed power applications.
Battery powered equipment.
Typical Application Circuit
Vin=12½76V
VCC
C1:
10uF/100V
R1 Ω
EN
BST
0.1uF
L : 33uH
LX
D1
FB
3.0kΩ
C2:
100uF/6.3V
VOUT=5.0V /3A
R2 Ω
GND
RT
VC
6800pF
0.75kΩ
47kΩ
10kΩ
Figure 1. Typical Application Schematic
〇Product
structure : Silicon monolithic integrated circuit
.
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〇This
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Pin Configuration
LX 1
GND 2
Thermal Pad
VC 3
FB 4
8 VCC
7 BST
6 EN
5 RT
Figure 2.Pin Configuration (TOP VIEW)
Pin Description
Pin No.
1
Pin Name
LX
Description
Switching node. It should be connected as near as possible to the schottky
barrier diode, and inductor.
Ground pin. GND pattern is kept from the current line of input capacitor to
output capacitor.
The output of the internal error amplifier. The phase compensation
implementation is connected between this pin to GND.
Voltage feedback pin. This pin is the error-amp input with the DC voltage is
set at 1.0V with feed-back operation.
The internal oscillator frequency set pin. The internal oscillator is set with a
single resistor connected between this pin and the GND pin.
Recommended frequency range is 50kHz to 750kHz
Shutdown pin. If the voltage of this pin is below 1.3V,the regulator will be in a
low power state. If the voltage of this pin is between 1.3V and 2.4V. The IC
will be in standby mode. If the voltage of this pin is above 2.6V, the regulator
is operational. An external voltage divider can be used to set under voltage
threshold. If this pin is left open circuit. when converter is operating. This pin
output 10uA source current. If this pin is left open circuit, a 10uA pull up
current source configures the regulator fully operational.
Boost input for bootstrap capacitor
The external capacitor is required between the BST and the Lx pin.
A 0.1uF ceramic capacitor is recommended.
Input supply voltage pin.
Connect to GND.
2
GND
3
4
5
VC
FB
RT
6
EN
7
8
-
BST
VCC
Thermal Pad
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Block Diagram
ON/OFF
EN
10uA
↓
STANBY
VCC
TSD
UVLO
Reference
VREF
REG
-
+
2.6V
VC
OVP
shutdown
OCP
Current Sense
AMP
BST
-
+
+
Error
AMP
Current
Comparator
-
R Q
+
S
FB
1.0V
Σ
0.15Ω
Soft
Start
20Ω
LX
VOUT
Soft Start
Oscillator
Oscillator
20Ω
RT
GND
Figure 3.Block Diagram
Description of Block(s)
1.
Reference
This block generates inner reference voltage.
REG
This block generates 8V reference voltage for bootstrap.
OSC
This block generates inner CLK.
The internal oscillator is set with a single resistor connected between this pin and the GND pin.
Recommended frequency range is 50 kHz to 750 kHz. If RT pin connect to 47kohm, frequency is set 200 kHz.
Soft Start
Soft Start of the output voltage of regulator prevents in-rush current during Start-up.
Soft Start time is 20msec (typ)
ERROR AMP
This is an error amplifier what detects output signal, and outputs PWM control signal.
Internal reference voltage is set to 1.0V.
ICOMP
This is a comparator that outputs PWM signal from current feed-back signal and error-amp output for current-mode.
Nch FET SW
This is a 80V/150mΩ-Power Nch MOSFET SW that converts inductor current of DC/DC converter
Since the current rating of this FET is 3.5A, it should be used within 3.5A including the DC current and ripple current of the
coil.
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, When VCC Voltage becomes 11V and below, UVLO turns OFF
all Output FET and turns OFF the DC/DC Comparator Output, and the Soft Start Circuit resets.
Now this Threshold has Hysteresis of 200mV.
2.
3.
4.
5.
6.
7.
8.
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9.
EN
Shutdown function. If the voltage of this pin is below 1.3V, the regulator will be in a low power state. If the voltage of
this pin is between 1.3V and 2.4V will be standby mode. If the voltage of this pin is above 2.6V, the regulator is
operational. An external voltage divider can be used to set under voltage threshold. If this pin is left open circuit. when
converter is operating. This pin output 10uA source current. If this pin is left open circuit, a 10uA pull up current source
configures the regulator fully operational. When IC turn off, EN pin is pulled down by pull down resistor that sink above
10uA.
10. OCP
Over current protection
If the current of power MOSFET is over 6.0A (typ), this function reduces duty pulse –by- pulse and restricts the
over current. If IC detects OCP 2 times sequentially, the device will stop and after 20 msec restart.
11. TSD
This is Thermal Shutdown Detection
When it detects an abnormal temperature exceeding Maximum Junction Temperature (Tj=150°C), it turns OFF all
Output FETs, and turns OFF the DC/DC Comparator Output. When Temperature falls, and the IC automatically returns
12. OVP
Over voltage protection.
Output voltage is monitored with FB terminal, and output FET is turned off when it becomes 120% of set-point voltage.
Absolute Maximum Ratings
Item
Maximum input voltage
BST to GND
Maximum input current
BST to LX
EN to GND
LX to GND
FB to GND
Power Dissipation
Operating Temperature
Storage Temperature
Junction Temperature
Symbol
VCC
VBST
Imax
⊿VBST
VEN
VLX
VFB
Pd
Topr
Tstg
Tjmax
3.76
Ratings
80
85
3.5
15
80
80
7
(NOTE1)
Unit
V
V
A
V
V
V
V
W
°C
°C
°C
-40 to +85
-55 to +150
150
(NOTE1)During mounting of 70×70×1.6t mm 4layer board.Reduce by 5.4mW for every 1°C increase..(Above 25°C)
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Electrical Characteristics (Unless
otherwise specified Ta=25°C, VCC=48V, Vo=5V,EN=3V,RT=47kΩ
)
Parameter
【Circuit
Current】
Stand-by current of VCC
Circuit current of VCC
【Under
Voltage Lock Out (UVLO)】
Detect Voltage
Hysteresis width
【Error
Amp】
FB threshold voltage
FB Input bias current
VC source current
VC sink current
Soft start time
Error amplifier DC gain
Trans conductance
【Current
Sense Amp
】
VC to switch current trans conductance
Symbol
Limit
Min
―
―
10.4
―
0.985
0.980
-1
15
-65
15
―
―
―
3.5
―
15
―
Typ
0
1.5
11
200
1.000
1.000
0
40
-40
20
10000
300
10
6.0
2
20
150
Max
10
2.0
11.6
300
1.015
1.020
1
65
-15
25
―
―
―
―
―
25
―
Unit
Condition
Ist
Icc
Vccuv
Vuvhy
VFBN
VFBA
IFB
Isource
Isink
Tsoft
AVEA
GEA
G
CS
Iocp
NOCP
TOCP
RonH
µA
mA
V
mV
V
V
uA
uA
uA
msec
V/V
µA/V
A/V
A
count
msec
mΩ
VEN=0V
FB=1.5V
Ta=25°C
Ta=-40 to 85°C
VFB=2.0V
【OCP】
Detect current
OCP latch count
OCP latch hold time
【Ouput】
Lx NMOS ON resistance
【CTL】
EN Pin inner REG on voltage
EN Pin IC output on threshold
EN pin
【Oscillator】
Oscillator frequency
Forced off time
ON
VENON
Venuv
IEN
Fosc
Toff
1.3
2.52
9.0
180
―
―
2.6
10.0
200
―
2.4
2.68
11.0
220
500
V
V
µA
kHz
nsec
IC on or off threshold
VEN=3V
RT:R=47kΩ
Recommended Operating Ratings(Ta=25°C)
Item
Power Supply Voltage
Output voltage
Output current
Oscillator frequency
Symbol
VCC
VOUT
IOUT
Fosc
Rating
Min
12
1.0
(Note2)
Typ
―
―
―
―
Max
76
VCC
(Note3)
Unit
V
V
A
kHz
-
50
3.0
750
(Note2) Restricted by minduty=f×MinOn Time ( f :frequency)
If the voltage of Vcc×minduty [V] lower than 1V, this value is minimum output.
(Note3) Restricted by maxduty =1-f×forced off time
The maximum output is (Vcc– Iout*Ron)×maxduty
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