BU28TA2WNVX(2009) Просмотр технического описания (PDF) - ROHM Semiconductor

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производитель

BU28TA2WNVX
(Rev.:2009)

High-speed Load Response FULL CMOS LDO Regulators

ROHM Semiconductor 

BUTA2WNVX Series, BUTA2WHFV Series

Technical Note

 Other notes

- About absolute maximum rating

Breakage may occur when absolute maximum ratings such as applied voltage and operating temperature range are

exceeded. Short mode or open mode cannot be specified at occurrence of a break, so please prepare physical safety

measures (e.g., fuse) if such special mode in which the absolute maximum rating is exceeded can be assumed.

- About GND potential

Please be sure that the potential of the GND terminal is the lowest in any operating condition.

- About thermal design

Please provide thermal design with sufficient margin, taking power dissipation (Pd) in actual usage conditions into

consideration.

- About short between pins and misattachment

Please be careful regarding the IC direction and misalignment at attachment onto a printed circuit board. Misattachment

may cause a break of IC. Short caused by foreign matter between outputs, output and power supply, or GNDs may also

lead to a break.

- About operation in a strong electromagnetic field

Please note that usage in a strong electromagnetic field may cause malfunction.

- About common impedance

Please give due consideration to wiring of the power source and GND by reducing common-mode ripple or

making ripple as small as possible (e.g., making the wiring as thick and short as possible, or reducing ripple by

LC), etc.

- About STBY terminal voltage

Set STBY terminal voltage to 0.3 V or less to put each channel into a standby state and to 1.5 V or more to put each

channel into an operating state. Do not fix STBY terminal voltage to 0.3 V or more and 1.5 V or less or do not lengthen

the transition time. This may cause malfunction or failure.

When shorting the VIN terminal and STBY terminal for usage, the status will be “STBY=VIN＝LOW” at turning the power

OFF, and discharge of the VOUT terminal cannot operate, which means voltage may remain for a certain time in the

VOUT terminal. Since turning the power ON again in this state may cause overshoot, turn the power ON for use after the

VOUT terminal is completely discharged.

- About overcurrent protection circuit

Output has a built-in overcurrent protection circuit, which prevents IC break at load short. Note that this protection circuit

is effective for prevention of breaks due to unexpected accidents. Please avoid usage by which the protection circuit

operates continuously.

- About thermal shutdown

Output is OFF when the thermal circuit operates since a temperature protection circuit is built in to prevent thermal

breakdown. However, it recovers when the temperature returns to a certain temperature. The thermal circuit operates at

emergency such as overheating of IC. Since it is prepared to prevent IC breakdown, please do not use it in a state in

which protection works.

Reverse current

 About reverse current

For applications on which reverse current is assumed to flow into IC,

it is recommended to prepare a path to let the current out

by putting a bypass diode between the VIN-VOUT terminals.

VIN

OUT

STBY GND

Fig.181 Example of bypass diode connection

 About testing on a set board

When connecting a capacitor to a terminal with low impedance for testing on a set board, please be sure to discharge for

each process since IC may be stressed. As a countermeasure against static electricity, prepare grounding in the assembly

process and take sufficient care in transportation and storage. In addition, when connecting a capacitor to a jig in a testing

process, please do so after turning the power OFF and remove it after turning the power OFF.

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© 2009 ROHM Co., Ltd. All rights reserved.

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2009.05 - Rev.B

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