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PDF BD9E151NUX Data sheet ( Hoja de datos )
| Número de pieza | BD9E151NUX | |
| Descripción | 1ch Step-Down Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
6.0V～28V, 1.2A 1ch
1ch Step-Down Switching Regulator
BD9E151NUX
General Description
The BD9E151NUX is a 28V, 1.2A diode-rectification
buck converter that integrated internal high-side 30V
Power MOSFET. To increase efficiency at light loads, a
pulse skipping is automatically activated. Furthermore,
the 0uA shutdown supply current allows the device to be
used in battery powered application. Current mode
control with internal slope compensation simplifies the
external component count while allowing the use of
ceramic output capacitors.
Key Specifications
■ Input Voltage
■ Ref. Precision (Ta=25℃)
■ Max Output Current
■ Operating Temperature
■ Operating Junction Temperature
6～28 [V]
±1.0[%]
1.2 [A] (Max.)
-40℃~85℃
-55℃～125℃
Packages
VSON008X2030
2.00mm x3.00mm x 0.60mm
Features
■ High and Wide Input Range (VIN=6V~28V)
■ 30V/80mΩ Internal Power MOSFET
■ 600kHz Fixed Operating Frequency
■ Feedback Pin Voltage 1.0V±1.0%
■ Internal Over Current Protection(OCP), Under
Voltage Locked Out(UVLO), Over Voltage
Protection(OVP), Thermal Shut down(TSD)
■ 0μA Low Shutdown Supply Current
■ VSON008X2030 package
Typical Application Circuits
VSON008X2030
Applications
■ Surveillance Camera Applications
■ OA Applications
■ 12V, 24V Distributed Power Systems
Figure 1. Typical Application Circuit
○Structure：Silicon Monolithic Integrated Circuit ○This product is not designed for normal operation within a radioactive
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product has not designed protection against radioactive rays
1/19
TSZ02210-0Q3Q0AZ00160-1-2
2013.07.17 Rev.001
http://www.Datasheet4U.com
1 page  
BD9E151NUX
Datasheet
Electrical Characteristics (Unless otherwise specified Ta=25℃, VIN=12V, VOUT=5V)
Parameter
Symbol
【Circuit current】
Stand-by current of VIN
Circuit current of VIN
【Under voltage Lock out (UVLO)】
Reset threshold voltage
Hysteresis width
【Oscillator】
Oscillating frequency
Max duty cycle
【Error amplifier】
FB threshold voltage
Input bias current
Error amplifier DC gain
Error amplifier transconductance
【Current sense amplifier】
VC to switch current transconductance
【Output】
High-side MOSFET ON resistance
Over current detect current
【CTL】
EN pin control voltage
ON
OFF
EN pin input current
【SOFT START】
Charge current
◎Not designed to withstand radiation.
Ist
Icc
Vuv
Vuvhy
fsw
Dmax
VFB
IFB
AVEA
GEA
ＧCS
RonH
Iocp
VEN
VENOFF
REN
Iss
Min.
－
－
5.0
－
540
85
0.990
-1.0
-
-
-
－
1.6
2.4
-0.3
6.0
1
Limits
Typ.
0
0.8
5.4
200
600
91
1.000
0
600
250
10
80
2.2
－
－
7.0
2
Max
10
1.6
5.8
400
660
-
1.010
1.0
6000
500
20
160
－
VIN
0.8
15.0
4
Unit Conditions
uA VEN=0
mA FB=1.5V
V VIN rising
mV
kHz
%
V
uA VFB=0V
V/V
uA/V IVC=±10uA,VC=1.0V
A/V
mΩ
A
V Ta=-40~85℃
V VIN=6~28V
uA VEN=5V
uA
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved
TSZ22111・15・001
5/19
TSZ02210-0Q3Q0AZ00160-1-2
2013.07.17 Rev.001
http://www.Datasheet4U.com
5 Page 
BD9E151NUX
Datasheet
Application Components Selection Method
(1) Inductors
Something of the shield type that fulfills the current rating (Current value
Ipecac below), with low DCR is recommended. Value of Inductance influences
Inductor Ripple Current and becomes the cause of Output Ripple.
In the same way as the formula below, this Ripple Current can be made small
for as big as the L value of Coil or as high as the Switching Frequency.
⊿IL
Ipeak = IOUT +
・・・ (1)
2
⊿IL =
VIN-VOUT
×
L
VOUT
VIN
×
1
f
・・・ (2)
ΔIL
Figure 24. Inductor Current
(⊿IL: Output Ripple Current, VIN: Input Voltage, VOUT: Output Voltage, f: Switching Frequency)
For design value of Inductor Ripple Current, please carry out design tentatively with about 20%～50% of Maximum Input
Current
(2) Output Capacitor
In order for capacitor to be used in output to reduce output ripple, Low ceramic capacitor of ESR is recommended.
Also, for capacitor rating, on top of putting into consideration DC Bias characteristics, please use something whose
maximum rating has sufficient margin with respect to the Output Voltage. Output ripple voltage is looked for using the
following formula. The actual value of the output capacitor is not critical, but some practical limits do exist. Consider the
relationship between the crossover frequency of the design and LC corner frequency of the output filter. In general, it is
desirable to keep the crossover frequency at less than 1/5 of the switching frequency. With high switching frequencies
such as the 600kHz frequency of this design, internal circuit limitations of the BD9E151NUX limit the practical maximum
crossover frequency to about 30kHz. In general, the crossover frequency should be higher than the corner frequency
determined by the load impedance and the output capacitor. This limits the minimum capacitor value for the output filter
to:
1
COUT_min = 2π×Rl×fc_max
・・・ (3)
Where: Rl is the output load resistance and fc_max is the maximum crossover frequency. The output ripple voltage can
be estimated by:
Vpp = ⊿IL ×
1
2π×f×COUT
+
⊿IL
×
RESR
・・・ (4)
Please design in a way that it is held within Capacity Ripple Voltage.
In the BD9E151NUX, it is recommended a ceramic capacitor more than 10µF.
(3) Output Voltage Setting
ERROR AMP internal Standard Voltage is 1.0V. Output Voltage is determined as seen in (5) formula
VOUT
R1 ERROR AMP
FB
R2
VOUT =
R1+R2
R2
・・・ (5)
VREF
1.0 V
Figure 25. Output Voltage Setting
(4) Bootstrap Capacitor
Please connect from 0.047µF to 0.47µF (Laminate Ceramic Capacitor) between BST Pin and LX Pin.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved
TSZ22111・15・001
11/19
TSZ02210-0Q3Q0AZ00160-1-2
2013.07.17 Rev.001
http://www.Datasheet4U.com
11 Page | ||
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