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BD9P105MUF-CE2 Folha de dados(PDF) 20 Page - Rohm

Nome de Peças BD9P105MUF-CE2
Descrição Electrónicos  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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Fabricante Electrônico  ROHM [Rohm]
Página de início  http://www.rohm.com
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BD9P105MUF-CE2 Folha de dados(HTML) 20 Page - Rohm

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© 2019 ROHM Co., Ltd. All rights reserved.
28.Apr.2020 Rev.001
www.rohm.com
TSZ22111 • 15 • 001
BD9P1x5MUF-C Series
TSZ02201-0J1J0AL01500-1-2
Function Explanation - continued
3.
Enable Control
The device shutdown can be controlled by the EN pin. When VEN reaches VENH (2.0 V) or higher, the internal circuit is
activated. When the VOUT_DIS pin is connected to output voltage and the EN pin is low, the VOUT_DIS pin is pulled
down by the resistance of RDIS (75 Ω, Typ) and discharges the output voltage. This discharge function is deactivated
when VOUT_DIS voltage falls below VDISL (200 mV, Typ) at once or 30 ms (Typ) pass after the EN pin becomes high.
After being deactivated, the VOUT starts up with soft start operation. The delay time tDLY (400 µs, Typ) is implemented
from the EN pin becoming high to VOUT starting up regardless of VOUT_DIS voltage. The soft start time (VOUT x 0.1 to
VOUT x 0.9) is set to tSS (3.0 ms, Typ). When an EN voltage becomes VENL (0.8 V) or less, the device is shut down. When
discharge function is not required, connect the VOUT_DIS pin to GND.
The discharge function is available with only BD9P135MUF-C and BD9P155MUF-C.
Figure 33. Enable ON/OFF Timing Chart
4.
Reset Function
For BD9P105MUF-C, the reset function monitors the FB pin voltage. When the output voltage reaches VRTH (95.3 %,
Typ) or more of the normal regulation voltage, the open drain MOSFET on the RESET pin is turned off in tRSTNACT (3.6
ms, Typ) and the output of the RESET pin becomes high by its pull-up resistor. In addition, when the FB voltage reaches
VRTL (92.8 %, Typ) or less, the open drain MOSFET on the RESET pin is turned on and the RESET pin is pulled down
with an impedance of RRST (190 Ω, Typ). To reject noise, the filtering time tRSTNFILT (5 µs, Typ) is implemented after FB
voltage decreases below its threshold voltage (VRTL).
The reset function also works when output over voltage is detected. When the output voltage reaches VOVPH (107.3 %,
Typ) or more, the open drain MOSFET on the RESET pin is turned on. Then, when the FB voltage goes below VOVPL
(104.7 %, Typ) or less, the open drain MOSFET on the RESET pin is turned off. The reset active time and filtering time
are activated when over voltage conditions are detected.
For BD9P135MUF-C and BD9P155MUF-C, this function monitors the VOUT_SNS pin voltage.
The RESET output voltage low level (VRESET_LOW(Max)) when the open drain MOSFET is turned on is calculated by the
following equation. It is recommended to use resistance of 5 kΩ to 100 kΩ and pull it up to the VREG pin or the power
supply in the absolute maximum voltage ratings of the RESET pin.
During shutdown condition, the RESET pin is pulled down regardless the output voltage as far as VIN is 2 V or higher.
Figure 34. Reset Timing Chart (BD9P105MUF-C)
������������������������_������������(������������) = ��������������������−�������� ×
����������������(������������)
����������������(������������)+��������������������−��������
[V]
Where:
������������������������_������������(������������)
is the RESET Low voltage level (Max) [V]
��������������������−��������
is the Voltage of pull-up power source [V]
����������������(������������)
is the RESET ON Resistance (Max) [Ω]
��������������������−��������
is the value of pull-up resistor to VPULL_UP [Ω]
VEN
VOUT
tSS x 1.25
VENH
VENL
tSS
10 %
90 %
VDISL
tDLY
Discharge
ON
OFF
30 ms
2.0 V
0.8 V
tDLY
3.0 ms
400 µs
(Typ)
(Typ)
200 mV
(Typ)
400 µs
(Typ)
VDISL
200 mV
(Typ)
(Typ)
VOUT
VRESET
VOVPH = VFB1 × 107.3 % (Typ)
VOVPL = VFB1 × 104.7 % (Typ)
VRTH = VFB1 × 95.3 % (Typ)
VRTL = VFB1 × 92.8 % (Typ)
VFB1
tRSTNACT
3.6 ms
(Typ)
Under 5 µs
(Typ)
5 µs
(Typ)
3.6 ms
(Typ)
Under 5 µs
(Typ)
5 µs
(Typ)
3.6 ms
(Typ)
Under tRSTNFILT
tRSTNFILT
tRSTNACT
Under tRSTNFILT
tRSTNFILT
tRSTNACT


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