Built-in ultra-high voltage power MOSFET 1ch Buck Switching Regulator BD9G341AEFJ

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Built-in ultra-high voltage power MOSFET
1ch Buck Switching Regulator
BD9G341AEFJ
80V withstand voltage ideal
for communication
infrastructure applications
Product Outline
The BD9G341AEFJ 1ch buck switching regulator with built-in 80V-rated (76V input) power MOSFET provides
sufficient margin for 48V bus lines used for communication infrastructure, making it easy to implement safer power
supply designs for high voltage applications such as phone systems, routers, and base stations.
HTSOP-J8
( 4.9 x 6.0 x 1.0mm )
■ 80V MOSFET ensures sufficient margin for 48V lines
Features
Application Circuit Example
• Broad input voltage range: VCC=12V to 76V
• Large output current: 3A (max.)
(with built-in 80V / 3.5A / 150mΩ Nch MOSFET)
0.1μF
VIN=48V
• Output voltage range: VOUT=1.0V to Vcc
VCC
10μF
BST
R1
• Variable frequency: 50kHz to 750kHz
33μH
LX
D1
EN
• Reference voltage: 1.0V±1.5% (25°C)
3.0kΩ
R2
• Standby mode
32°C
32°C
90
14
80
80
12
70
60
10
No element damage
40
8
20msec interval
20
6
LX pin voltage
4
0
2
Output current
0
0
5
10
15
20
25
30
35
40
45
50
Time (msec)
Efficiency (%)
16
Output Current (A)
LX Terminal Voltage (V)
*highest efficiency in the 80V class
100
Chip surface temp: 32°C
100
10kΩ
Efficiency is improved* across all load regions (by as much as 19%), leading to
significantly increased energy savings.
Short-Circuit Test
BD9G341AEFJ
BD9G341EFJ
(VCC=76V)
120
6800pF
■ High efficiency, energy-saving design
An integrated hiccup-mode overcurrent protection circuit prevents chip damage
due to excessive heat generation. This provides greater safety and stability and
eliminates the need for restart operation.
VOUT-GND
RT
47kΩ
• Overcurrent protection (OCP), Undervoltage lockout (UVLO),
Thermal shutdown (TSD), Overvoltage protection (OVP)
■ Safe, stable operation
0.75kΩ
VC
GND
100μF
FB
• High accuracy EN threshold: ±3%
• Soft start function
VOUT=5.0V / 3A
VCC=48V
Efficiency Comparison
Measurement Conditions
Measurement
Conditions
Oscillation Frequency : 300kHz (5V output)
1.5%
BD9G341AEFJ
60
16.3%
50
40
19%
30
Conventional
Conventional
20
10
0
1
*Hiccup mode: Automatically attempts to return to normal
operation at regular intervals once IC operation is stopped
due to overcurrent conditions
10
100
Output Current (mA)
26th October,2015.
.57F6869E 10.2015
1000
*October 2015 ROHM study
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