AIC1638 AIC [Analog Intergrations Corporation], AIC1638 Datasheet - Page 14

• Manufacturer Part Number: AIC1638
• Description: 3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
• Manufacturer: AIC [Analog Intergrations Corporation]

ANALOG INTEGRATIONS CORPORATION
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
Table 1 Indicates resistance and height for each coil.
CAPACITOR SELECTION
A poor choice for a output capacitor can result in
poor efficiency and high output ripple. Ordinary
aluminum electrolytic, while inexpensive may have
unacceptably poor ESR and ESL. There are low
ESR aluminum capacitors for switch mode DC-DC
converters which work much better than general
propose unit. Tantalum capacitors provide still better
performance
capacitors have extremely low ESR in a small size.
If capacitance is reduced, output ripple will increase.
Most of the input supply is supplied by the input
bypass capacitor, the capacitor voltage rating
should be at least 1.25 times greater than a
maximum input voltage.
Coilcraft SMT Type
(www.coilcraft.com)
Sumida SMT Type CD54
Hold
Hold
Power Inductor Type
SMT Type PM54
SMT Type PM75
at
more
expensive.
DO3316
DS1608
OS-CON
Inductance
( H )
100
100
100
22
47
22
47
47
47
33
3-PIN ONE-CELL STEP-UP DC/DC CONVERTER
DIODE SELECTION
Speed, forward drop, and leakage current are the
three main consideration in selecting a rectifier
diode. Best performance is obtained with Schottky
rectifier diode such 1N5819. Motorola makes
MBR0530 in surface mount. For lower output power
a 1N4148 can be used although efficiency and
start-up voltage will suffer substantially.
COMPONENT POWER DISSIPATION
Operating in discontinuous mode, power loss in the
winding resistance of inductor can be approximate
equal to
where P
PD
Resistance
www.analog.com.tw
L
TEL: [phone] FAX:[phone]
(
0.10
0.18
0.38
0.08
0.14
0.25
0.50
0.25
0.50
0.11
3
2
OUT
T
)
=V
L
ON
OUT
Rs
* I
OUT
V
Rated Current
OUT
V
; Rs=Inductor DC R;
OUT
SPEC NO: DS-1638-00 03/01/00
(A)
0.7
0.5
0.3
2.7
1.8
0.7
0.5
0.7
0.5
1.2
V
D
P
OUT
AIC1638
Height
(mm)
2.9
5.2
4.5
4.5
5.0
14