BD9718G
Regulators
Inverting Switching Regulator Controller
BD9718G
The BD9718G is a high performance fixed frequency power switching regulator. This regulator was specifically designed
to be incorporated for step-down and voltage inverting functions with a minimum number of external components.
!!!!Applications
Pre-amplifier bias supply for hard disk drive (HDD),
designs or other voltage inverter requirements.
!!!!Features
1) High-accuracy output voltage detection. (Vs= −5.00±1%)
2) High switching frequency (900kHz typ.)
3) Built-in soft start function. (No external components required.)
4) Timer latch type short protection function. (No external components
required.)
5) Ultra small package: SMP5C2
!!!!Absolute maximum ratings (Ta = 25°C)
Supply voltage
!!!!External dimensions (Unit : mm)
2.8±0.2
+0.2
1.6
1.1±0.05
−0.1
0.05±0.05
2.9±0.2
5
12
0.95
+6û
4û
-
4
3
0. 1 3
+0.05
0.42
-
0.04
0.1
SMP5C2
Parameter
Symbol Limits
V
CC 15 V
∗
Unit
4û
0.2Min.
+0.05
-
0.03
Power dissipation
Operating temperature range
Storage temperature range
∗ Derating : 1.7mW/°C for operation above Ta=25°C.
Pd
Topr
Tstg
!!!!Recommended operating conditions (Ta = 25°C)
Parameter
CC
Supply voltage
V
170 mW
−40 to +85
−55 to +125
°C
°C
Min.
4
Typ.
5
Max.
14 V
UnitSymbol
1/2
BD9718G
Regulators
!!!!Electrical Characteristics (Unless otherwise noted, Ta=25°C, V
CC
=5V)
Parameter
Bias current
Output sense voltage
Switching frequency
Maxim ON duty cycle
Output SAT voltage 1
Output SAT voltage 2
!!!!Application circuit
V
IN=
5V V
Symbol
CC
Vs
Fosc
DON
VSAT1
VSAT2
V
UT
V
V
CC
S
Min.
−5.05
600
70
−
V
CC-1
3.5
Typ.
4.6 mAI
−5.00
900
V
CC-0.8
3.8
OUT
GND
80
30
FB
Max.
8
−4.95
1200
90
150
−
4.0UVLO threshold voltage
Unit
VFB=1V−
V
FB=0.75V
V
kHz
V
FB=0.75V
%
FB=1.0V
V
mV
I
OUT−=20mA, Vs=−5.5V
V
I
OUT+=20mA, Vs=−4.5V
V
V
CC : sweep up
Conditions
O=−5V (300mA)
2/2
Appendix
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.
Notes
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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