BD9528AMUV Datasheet, PDF (28/30 Pages) Rohm – High Performance Regulators for PCs Main Power Supply for Notebook PCs(With Built-in Linear Regulator)

BD9528AMUV
Technical Note
9. Capacitor between output and GND
When a larger capacitor is connected between the output and GND, Vcc or VIN shorted with the GND or 0V line – for
any reason – may cause the charged capacitor current to flow to the output, possibly destroying the IC. Do not connect
a capacitor larger than 1000uF between the output and GND.
10. Precautions for board inspection
Connecting low-impedance capacitors to run inspections with the board may produce stress on the IC. Therefore, be
certain to use proper discharge procedure before each process of the operation. To prevent electrostatic accumulation
and discharge in the assembly process, thoroughly ground yourself and any equipment that could sustain ESD damage,
and continue observing ESD-prevention procedures in all handling, transfer and storage operations. Before attempting
to connect components to the test setup, make certain that the power supply is OFF. Likewise, be sure the power supply
is OFF before removing any component connected to the test setup.
11. GND wiring pattern
When both a small-signal GND and high current GND are present, single-point grounding (at the set standard point) is
recommended, in order to separate the small-signal and high current patterns, and to be sure the voltage change
stemming from the wiring resistance and high current does not cause any voltage change in the small-signal GND. In
the same way, care must be taken to avoid wiring pattern fluctuations in any connected external component GND.
●Heat Dissipation Characteristics
[mW]
1000
880mW
800
74.2mm×74.2mm×1.6mm Glass-epoxy PCB
θj-a=142.0℃/W
600
400
380mW
200
IC Only θj-a=328.9℃/W
0
25
50
75
100
125
150 [℃]
Ambient Temperature [Ta]
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
28/29
2011.11 - Rev.A