BD8158FVM(2010) View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

MFG CO.

BD8158FVM
(Rev.:2010)

High-efficiency Step-up Switching Regulators with Built-in Power MOSFET

ROHM Semiconductor 

BD8152FVM, BD8158FVM

Technical Note

Application Examples

Although ROHM is sure that the application examples are recommendable ones, further check the characteristics of

components that require high precision before using them.

When a circuit is used modifying the externally connected circuit constant, be sure to decide allowing sufficient margins

considering the dispersion of values by external parts as well as our IC including not only the static but also the transient

characteristic.For the patent, we have not acquired the sufficient confirmation. Please acknowledge the status.

(1) When the charge pump is removed from the DC/DC converter to make it 3-channel output mode:

It is possible to create the charge pump by using the switching operation of DC/DC converter. When the application

shown in the following diagram is used, 1-channel DC/DC converter output, 1-channel positive side charge pump and

1-channel negative side charge pump can be output as a total of 3-channels.

L1 10µH

D1

RB161M-20

VCC

C1

10µF

C2

0.01µF

8

SS

SLOPE

+

SOFT

START

7

FCLK

O SC

6

VCC

5

SW

CU R REN T

SENSE

Set LOGIC DRV

Reset

SDWN

P+W-M

OCP

E- R+R

UVLO/TSD

1.245V

VREF

COMP

1

FB

2

ENB

3

G ND

4

R3

5.1kΩ

C3

3300pF

R1

110kΩ

R2

18kΩ

Vo

9V

C0

10µF

0.1µF

0.1µF

DAN217U

1µF

0.1µF

1µF

1kΩ

UDZ

Series

DAN217U

100kΩ

2SD2657k

VGH

1µF

1µF 1kΩ

2SB1695k

UDZ

Series

100kΩ

VGL

1µF

Fig. 30 3ch Application Circuit Diagram Example

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© 2010 ROHM Co., Ltd. All rights reserved.

11/17

2010.03 - Rev.B

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