Rohm BH6559FV Dc/dc converter for cd/dvd-rom slim Datasheet

BH6559FV
Optical discs
DC/DC converter for CD/DVD-ROM slim
BH6559FV
BH6559FV is an IC that incorporates 1 channel variable DC/DC converter and reset function. Variable DC/DC converter
can set high-precision voltage (±2% precision) by trimming reference voltage.
!Applications
CD/DCD-ROM slim
!External dimensions (Units : mm)
5.0 ± 0.2
16
9
1
8
0.3Min.
1.15 ± 0.1 6.4 ± 0.3
0.1
4.4 ± 0.2
!Features
1) Low current consumption by adopting synchronous
rectifier type.
2) Few external components reduced by the built-in power
MOS transistor.
3) Adjustable by external resistor of DC/DC converter output.
4) Built-in reset for supply voltage and ATAPI
(output pin is common).
5) Built-in delay time setting function for supply voltage reset.
0.65
0.15 ± 0.1
0.1
0.22 ± 0.1
SSOP-B16
!Absolute maximum ratings (Ta=25°C)
Symbol
Limits
Unit
Supply voltage 1 (PRE block)
PREVCC1
7
V
Supply voltage 2 (PRE block)
PREVCC2
7
V
Supply voltage
POWVCC
7
Iswomax
1
Parameter
(PRE block)
Pin output current (DSW block)
Power dissipation
Pd
V
∗1
A
0.56 ∗2
W
Operating temperature range
Topr
−30 to +85
C
Storage temperature range
Tstg
−55 to +150
C
+
∗1 Intermittent current at maximum applied time of 5msec,1/10 duty (Max.)
∗2 Derating : 4.5mv/ C for operation above Ta=25 C. On less than 3% (percentage occupied by copper foil),
70mm 70mm, t=1.6mm, glass epoxy mounting.
1/3
BH6559FV
Optical discs
!Recommended Operating Conditions (Ta=25°C)
Symbol
Min.
Typ.
Max.
Unit
Supply voltage 1 (PRE block)
Parameter
PREVCC1
4.5
5.0
5.5
V
Supply voltage 2 (PRE block)
PREVCC2
4.5
5.0
5.5
V
Supply voltage
POWVCC
4.5
5.0
5.5
V
Ta
−10
25
70
C
Io
−
300
500
mA
VDD
1.7
−
VCC−1
V
(Pow block)
Ambient temperature
Vatiable DC/DC converter output current
∗
Vatiable DC/DC converter output voltage
∗ When L=47µH, C=47µF is used
!Electrical characteristics (Ta=25°C, PREVCC1/2=5V, POWVCC=5V)
Parameter
Current consumption at no signal
< Varible DC/DC converter >
EI pin threshold voltage
Symbol
Min.
Typ.
ICC
−
1.2
24
Max.
Unit
mA
Conditions
No load
VEITH
0.980
1.00
1.020
V
DSW pin ON resistance H
RDSWONH
−
0.42
0.87
Ω
IL=500mA
DSW pin ON resistance L
RDSWONL
−
0.30
0.60
Ω
IL=-500mA
fDSW
210
310
410
kHz
Vcc reset ON voltage
VRSTON
3.52
3.70
3.88
V
Vcc reset hysteresis width
VRSTHYS
50
80
110
mV
DSW pin oscollation frequency
< Reset block >
VRSTT
30
50
70
msec
ATAPI reset ON voltage
VATPON
1.25
1.40
1.55
V
ATAPI reset hysteresis width
VATPHYS
40
60
90
mV
Vcc reset delay time
OSC_R=22kΩ
sweep down
RESET τ=0.1µF
sweep down
∗ This product is not designed for protection against redioactive rays.
2/3
BH6559FV
Optical discs
!Application Circuit
PREGND2
POWGND
13
12
11
PREGND1
PREGND2
POWGND
PREGND1
R
16
14
15
10
9
POWVcc
SOFT
SAW OSC
or
PRE
DRIVE
POWGND
BH6559FV
RESET
ATAPI
IN
τ
RESET
IN
SAW OSC
SOFT
PREVcc1
2
10KΩ
3
4
PREVcc1
ATP_IN
VccMON
VDD
5
1000pF 10KΩ
1
6
PREVcc2
POWVcc
7
8
PREVcc2
100KΩ
POWVcc
1000pF
62KΩ
47µH
47µF
27KΩ
3/3
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0
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