Rainbow Electronics BD9718G User Manual
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
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