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BD9P1X5EFV-C 데이터시트(PDF) 24 Page - Rohm

부품명 BD9P1X5EFV-C
상세설명  3.5 V to 40 V Input, 1 A Single 2.2 MHz Buck DC/DC Converter For Automotive
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제조업체  ROHM [Rohm]
홈페이지  http://www.rohm.com
Logo ROHM - Rohm

BD9P1X5EFV-C 데이터시트(HTML) 24 Page - Rohm

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TSZ02201-0J1J0AL01480-1-2
© 2019 ROHM Co., Ltd. All rights reserved.
08.Apr.2020 Rev.002
www.rohm.com
TSZ22111
• 15 • 001
BD9P1x5EFV-C Series
Function Explanation - continued
8.
VCC_EX Function
This IC has the function that supplies power from VOUT to internal supply VREG to improve the efficiency. When
VVCC_EX goes above VTEXH (3.05 V, Typ) or more, VREG is supplied from the VCC_EX pin. In case of the VCC_EX pin
connected with VOUT, the output voltage is used as a power supply for the internal circuitry and driver block. To protect
the internal circuit, VOUT is reduced with PWM switching when VCC_EX voltage exceeds VEXOVPH (6.0 V, Typ).
Therefore, the VCC_EX pin connection can be used when the output voltage is in the range of between VTEXH (3.2 V,
Max) and VEXOVPL (5.65 V, Min). Connect the VCC_EX pin with GND when VCC_EX function is not required.
The bias current IBIAS using VCC_EX function can be calculated using the following formula.
�������������������� = ��������_������������1 + ��������_������������_��������1 ×
1
����
×
����������������_��������
������������
[μA]
Where:
��������������������
is total current from VIN [µA]
��������_������������1
is quiescent current from VIN (without current from VCC_EX) [µA]
(Refer to page 10)
��������_������������_��������1
is quiescent current from VCC_EX [µA]
(Refer to page 10)
����
is efficiency of Buck Converter
����������������_��������
is the VCC_EX voltage [V]
������������
is the input voltage [V]
VIN
VREG
+
VREG
(LDO)
-
VCC_EX
VTEXH = 3.05 V (Typ)
/ VTEXL = 2.90 V (Typ)
ON/OFF
ON/OFF
Figure 38. VCC_EX Block Diagram
VIN
VEN
VOUT = VVCC_EX
(Short)
VSW
VREG
VTEXH
3.05 V (Typ)
VCC_EX State
VCC_EX OFF
VCC_EX ON
VCC_EX OFF
VTEXL
2.90 V (Typ)
Vout Setting Level
Vout Setting Level
VREG
3.3 V (Typ)
Figure 39. VCC_EX Timing Chart


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